^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * IPv6 output functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Linux INET6 implementation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Pedro Roque <roque@di.fc.ul.pt>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Based on linux/net/ipv4/ip_output.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Changes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * A.N.Kuznetsov : airthmetics in fragmentation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * extension headers are implemented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * route changes now work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * ip6_forward does not confuse sniffers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * H. von Brand : Added missing #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Imran Patel : frag id should be in NBO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Kazunori MIYAZAWA @USAGI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * : add ip6_append_data and related functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * for datagram xmit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/in6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/bpf-cgroup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/netfilter.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/netfilter_ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <net/snmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <net/ndisc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <net/ip6_route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <net/addrconf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <net/rawv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <net/icmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <net/checksum.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <linux/mroute6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #include <net/l3mdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #include <net/lwtunnel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <net/ip_tunnels.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct dst_entry *dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct net_device *dev = dst->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) unsigned int hh_len = LL_RESERVED_SPACE(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int delta = hh_len - skb_headroom(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) const struct in6_addr *nexthop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct neighbour *neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* Be paranoid, rather than too clever. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (unlikely(delta > 0) && dev->header_ops) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* pskb_expand_head() might crash, if skb is shared */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (skb_shared(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (likely(nskb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (skb->sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) skb_set_owner_w(nskb, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) skb = nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (skb &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ((mroute6_is_socket(net, skb) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) &ipv6_hdr(skb)->saddr))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* Do not check for IFF_ALLMULTI; multicast routing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) is not supported in any case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (newskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) net, sk, newskb, NULL, newskb->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) dev_loopback_xmit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (ipv6_hdr(skb)->hop_limit == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) IP6_INC_STATS(net, idev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) IPV6_ADDR_SCOPE_NODELOCAL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) !(dev->flags & IFF_LOOPBACK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (lwtunnel_xmit_redirect(dst->lwtstate)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) int res = lwtunnel_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (res < 0 || res == LWTUNNEL_XMIT_DONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (unlikely(!neigh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (!IS_ERR(neigh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) sock_confirm_neigh(skb, neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) ret = neigh_output(neigh, skb, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ip6_finish_output_gso_slowpath_drop(struct net *net, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct sk_buff *skb, unsigned int mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct sk_buff *segs, *nskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) netdev_features_t features;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /* Please see corresponding comment in ip_finish_output_gso
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * describing the cases where GSO segment length exceeds the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * egress MTU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) features = netif_skb_features(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (IS_ERR_OR_NULL(segs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) skb_list_walk_safe(segs, segs, nskb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) skb_mark_not_on_list(segs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) err = ip6_fragment(net, sk, segs, ip6_finish_output2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (err && ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static int __ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) unsigned int mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* Policy lookup after SNAT yielded a new policy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (skb_dst(skb)->xfrm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) IP6CB(skb)->flags |= IP6SKB_REROUTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return dst_output(net, sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) mtu = ip6_skb_dst_mtu(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if ((skb->len > mtu && !skb_is_gso(skb)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) dst_allfrag(skb_dst(skb)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return ip6_fragment(net, sk, skb, ip6_finish_output2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return ip6_finish_output2(net, sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) case NET_XMIT_SUCCESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return __ip6_finish_output(net, sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) case NET_XMIT_CN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return __ip6_finish_output(net, sk, skb) ? : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) struct net_device *dev = skb_dst(skb)->dev, *indev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) skb->protocol = htons(ETH_P_IPV6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (unlikely(idev->cnf.disable_ipv6)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) net, sk, skb, indev, dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) ip6_finish_output,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) !(IP6CB(skb)->flags & IP6SKB_REROUTED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (!np->autoflowlabel_set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return ip6_default_np_autolabel(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return np->autoflowlabel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * xmit an sk_buff (used by TCP, SCTP and DCCP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * Note : socket lock is not held for SYNACK packets, but might be modified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * by calls to skb_set_owner_w() and ipv6_local_error(),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * which are using proper atomic operations or spinlocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) const struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct in6_addr *first_hop = &fl6->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct dst_entry *dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) unsigned int head_room;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct ipv6hdr *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) u8 proto = fl6->flowi6_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) int seg_len = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) int hlimit = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) u32 mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) head_room = sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) head_room += opt->opt_nflen + opt->opt_flen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (unlikely(skb_headroom(skb) < head_room)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (!skb2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (skb->sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) skb_set_owner_w(skb2, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) skb = skb2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) seg_len += opt->opt_nflen + opt->opt_flen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (opt->opt_flen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) ipv6_push_frag_opts(skb, opt, &proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (opt->opt_nflen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) &fl6->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) skb_push(skb, sizeof(struct ipv6hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) hdr = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * Fill in the IPv6 header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) hlimit = np->hop_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (hlimit < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) hlimit = ip6_dst_hoplimit(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) ip6_autoflowlabel(net, np), fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) hdr->payload_len = htons(seg_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) hdr->nexthdr = proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) hdr->hop_limit = hlimit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) hdr->saddr = fl6->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) hdr->daddr = *first_hop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) skb->protocol = htons(ETH_P_IPV6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) skb->priority = priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) skb->mark = mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) mtu = dst_mtu(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) IPSTATS_MIB_OUT, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /* if egress device is enslaved to an L3 master device pass the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * skb to its handler for processing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) skb = l3mdev_ip6_out((struct sock *)sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (unlikely(!skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /* hooks should never assume socket lock is held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * we promote our socket to non const
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) net, (struct sock *)sk, skb, NULL, dst->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) dst_output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) skb->dev = dst->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) /* ipv6_local_error() does not require socket lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * we promote our socket to non const
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) EXPORT_SYMBOL(ip6_xmit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) struct ip6_ra_chain *ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) struct sock *last = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) read_lock(&ip6_ra_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) for (ra = ip6_ra_chain; ra; ra = ra->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) struct sock *sk = ra->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) if (sk && ra->sel == sel &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) (!sk->sk_bound_dev_if ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) sk->sk_bound_dev_if == skb->dev->ifindex)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (np && np->rtalert_isolate &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) !net_eq(sock_net(sk), dev_net(skb->dev))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (last) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (skb2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) rawv6_rcv(last, skb2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) last = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) if (last) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) rawv6_rcv(last, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) read_unlock(&ip6_ra_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) read_unlock(&ip6_ra_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) static int ip6_forward_proxy_check(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct ipv6hdr *hdr = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) u8 nexthdr = hdr->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) __be16 frag_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) if (ipv6_ext_hdr(nexthdr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (offset < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) offset = sizeof(struct ipv6hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) if (nexthdr == IPPROTO_ICMPV6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) struct icmp6hdr *icmp6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (!pskb_may_pull(skb, (skb_network_header(skb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) offset + 1 - skb->data)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) switch (icmp6->icmp6_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) case NDISC_ROUTER_SOLICITATION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) case NDISC_ROUTER_ADVERTISEMENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) case NDISC_NEIGHBOUR_SOLICITATION:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) case NDISC_NEIGHBOUR_ADVERTISEMENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) case NDISC_REDIRECT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /* For reaction involving unicast neighbor discovery
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * message destined to the proxied address, pass it to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * input function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * The proxying router can't forward traffic sent to a link-local
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) * address, so signal the sender and discard the packet. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) * behavior is clarified by the MIPv6 specification.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) dst_link_failure(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) static inline int ip6_forward_finish(struct net *net, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) struct dst_entry *dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) __IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) __IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) #ifdef CONFIG_NET_SWITCHDEV
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (skb->offload_l3_fwd_mark) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) skb->tstamp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) return dst_output(net, sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (skb->len <= mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) /* ipv6 conntrack defrag sets max_frag_size + ignore_df */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (skb->ignore_df)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) int ip6_forward(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) struct dst_entry *dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) struct ipv6hdr *hdr = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) struct inet6_skb_parm *opt = IP6CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) struct net *net = dev_net(dst->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) struct inet6_dev *idev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) u32 mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (net->ipv6.devconf_all->forwarding == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (skb->pkt_type != PACKET_HOST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (unlikely(skb->sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (skb_warn_if_lro(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (!net->ipv6.devconf_all->disable_policy &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) !idev->cnf.disable_policy &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) !xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) skb_forward_csum(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) * We DO NOT make any processing on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) * RA packets, pushing them to user level AS IS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) * without ane WARRANTY that application will be able
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) * to interpret them. The reason is that we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) * cannot make anything clever here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) * We are not end-node, so that if packet contains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) * AH/ESP, we cannot make anything.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) * Defragmentation also would be mistake, RA packets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) * cannot be fragmented, because there is no warranty
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * that different fragments will go along one path. --ANK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) if (ip6_call_ra_chain(skb, ntohs(opt->ra)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * check and decrement ttl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (hdr->hop_limit <= 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) __IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) return -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) /* XXX: idev->cnf.proxy_ndp? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) if (net->ipv6.devconf_all->proxy_ndp &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) int proxied = ip6_forward_proxy_check(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (proxied > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return ip6_input(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) else if (proxied < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) if (!xfrm6_route_forward(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) __IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) /* IPv6 specs say nothing about it, but it is clear that we cannot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) send redirects to source routed frames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) We don't send redirects to frames decapsulated from IPsec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (IP6CB(skb)->iif == dst->dev->ifindex &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) opt->srcrt == 0 && !skb_sec_path(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) struct in6_addr *target = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) struct inet_peer *peer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) struct rt6_info *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * incoming and outgoing devices are the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * send a redirect.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) rt = (struct rt6_info *) dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (rt->rt6i_flags & RTF_GATEWAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) target = &rt->rt6i_gateway;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) target = &hdr->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) /* Limit redirects both by destination (here)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) and by source (inside ndisc_send_redirect)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) if (inet_peer_xrlim_allow(peer, 1*HZ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) ndisc_send_redirect(skb, target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) if (peer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) inet_putpeer(peer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) int addrtype = ipv6_addr_type(&hdr->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) /* This check is security critical. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) if (addrtype == IPV6_ADDR_ANY ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (addrtype & IPV6_ADDR_LINKLOCAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) icmpv6_send(skb, ICMPV6_DEST_UNREACH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) ICMPV6_NOT_NEIGHBOUR, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) mtu = ip6_dst_mtu_forward(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) if (mtu < IPV6_MIN_MTU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) mtu = IPV6_MIN_MTU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (ip6_pkt_too_big(skb, mtu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) /* Again, force OUTPUT device used as source address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) skb->dev = dst->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) __IP6_INC_STATS(net, idev, IPSTATS_MIB_INTOOBIGERRORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) __IP6_INC_STATS(net, ip6_dst_idev(dst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) IPSTATS_MIB_FRAGFAILS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) if (skb_cow(skb, dst->dev->hard_header_len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) __IP6_INC_STATS(net, ip6_dst_idev(dst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) hdr = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) /* Mangling hops number delayed to point after skb COW */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) hdr->hop_limit--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) net, NULL, skb, skb->dev, dst->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) ip6_forward_finish);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) __IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) to->pkt_type = from->pkt_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) to->priority = from->priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) to->protocol = from->protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) skb_dst_drop(to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) skb_dst_set(to, dst_clone(skb_dst(from)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) to->dev = from->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) to->mark = from->mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) skb_copy_hash(to, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) #ifdef CONFIG_NET_SCHED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) to->tc_index = from->tc_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) nf_copy(to, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) skb_ext_copy(to, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) skb_copy_secmark(to, from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) u8 nexthdr, __be32 frag_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) struct ip6_fraglist_iter *iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) unsigned int first_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) struct frag_hdr *fh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) /* BUILD HEADER */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) *prevhdr = NEXTHDR_FRAGMENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) iter->tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (!iter->tmp_hdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) iter->frag = skb_shinfo(skb)->frag_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) skb_frag_list_init(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) iter->offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) iter->hlen = hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) iter->frag_id = frag_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) iter->nexthdr = nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) __skb_pull(skb, hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) fh = __skb_push(skb, sizeof(struct frag_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) __skb_push(skb, hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) memcpy(skb_network_header(skb), iter->tmp_hdr, hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) fh->nexthdr = nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) fh->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) fh->frag_off = htons(IP6_MF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) fh->identification = frag_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) first_len = skb_pagelen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) skb->data_len = first_len - skb_headlen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) skb->len = first_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) ipv6_hdr(skb)->payload_len = htons(first_len - sizeof(struct ipv6hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) EXPORT_SYMBOL(ip6_fraglist_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) void ip6_fraglist_prepare(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) struct ip6_fraglist_iter *iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) struct sk_buff *frag = iter->frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) unsigned int hlen = iter->hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) struct frag_hdr *fh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) frag->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) skb_reset_transport_header(frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) fh = __skb_push(frag, sizeof(struct frag_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) __skb_push(frag, hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) skb_reset_network_header(frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) memcpy(skb_network_header(frag), iter->tmp_hdr, hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) iter->offset += skb->len - hlen - sizeof(struct frag_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) fh->nexthdr = iter->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) fh->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) fh->frag_off = htons(iter->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) if (frag->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) fh->frag_off |= htons(IP6_MF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) fh->identification = iter->frag_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) ip6_copy_metadata(frag, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) EXPORT_SYMBOL(ip6_fraglist_prepare);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) state->prevhdr = prevhdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) state->nexthdr = nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) state->frag_id = frag_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) state->hlen = hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) state->mtu = mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) state->left = skb->len - hlen; /* Space per frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) state->ptr = hlen; /* Where to start from */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) state->hroom = hdr_room;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) state->troom = needed_tailroom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) state->offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) EXPORT_SYMBOL(ip6_frag_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) struct sk_buff *ip6_frag_next(struct sk_buff *skb, struct ip6_frag_state *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) u8 *prevhdr = state->prevhdr, *fragnexthdr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) struct sk_buff *frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) struct frag_hdr *fh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) len = state->left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) /* IF: it doesn't fit, use 'mtu' - the data space left */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) if (len > state->mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) len = state->mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) /* IF: we are not sending up to and including the packet end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) then align the next start on an eight byte boundary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) if (len < state->left)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) len &= ~7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) /* Allocate buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) frag = alloc_skb(len + state->hlen + sizeof(struct frag_hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) state->hroom + state->troom, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) if (!frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) * Set up data on packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) ip6_copy_metadata(frag, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) skb_reserve(frag, state->hroom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) skb_put(frag, len + state->hlen + sizeof(struct frag_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) skb_reset_network_header(frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) fh = (struct frag_hdr *)(skb_network_header(frag) + state->hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) frag->transport_header = (frag->network_header + state->hlen +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) sizeof(struct frag_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) * Charge the memory for the fragment to any owner
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) * it might possess
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) if (skb->sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) skb_set_owner_w(frag, skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) * Copy the packet header into the new buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) skb_copy_from_linear_data(skb, skb_network_header(frag), state->hlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) fragnexthdr_offset = skb_network_header(frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) fragnexthdr_offset += prevhdr - skb_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) *fragnexthdr_offset = NEXTHDR_FRAGMENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) * Build fragment header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) fh->nexthdr = state->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) fh->reserved = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) fh->identification = state->frag_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) * Copy a block of the IP datagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) BUG_ON(skb_copy_bits(skb, state->ptr, skb_transport_header(frag),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) len));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) state->left -= len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) fh->frag_off = htons(state->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) if (state->left > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) fh->frag_off |= htons(IP6_MF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) state->ptr += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) state->offset += len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) return frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) EXPORT_SYMBOL(ip6_frag_next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) int (*output)(struct net *, struct sock *, struct sk_buff *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) struct sk_buff *frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) inet6_sk(skb->sk) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) struct ip6_frag_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) unsigned int mtu, hlen, nexthdr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) ktime_t tstamp = skb->tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) int hroom, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) __be32 frag_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) u8 *prevhdr, nexthdr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) err = ip6_find_1stfragopt(skb, &prevhdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) hlen = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) nexthdr = *prevhdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) nexthdr_offset = prevhdr - skb_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) mtu = ip6_skb_dst_mtu(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) /* We must not fragment if the socket is set to force MTU discovery
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) * or if the skb it not generated by a local socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) if (unlikely(!skb->ignore_df && skb->len > mtu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) goto fail_toobig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) if (IP6CB(skb)->frag_max_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) if (IP6CB(skb)->frag_max_size > mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) goto fail_toobig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) /* don't send fragments larger than what we received */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) mtu = IP6CB(skb)->frag_max_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (mtu < IPV6_MIN_MTU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) mtu = IPV6_MIN_MTU;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) if (np && np->frag_size < mtu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) if (np->frag_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) mtu = np->frag_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) if (mtu < hlen + sizeof(struct frag_hdr) + 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) goto fail_toobig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) mtu -= hlen + sizeof(struct frag_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) &ipv6_hdr(skb)->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) if (skb->ip_summed == CHECKSUM_PARTIAL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) (err = skb_checksum_help(skb)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) prevhdr = skb_network_header(skb) + nexthdr_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) hroom = LL_RESERVED_SPACE(rt->dst.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (skb_has_frag_list(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) unsigned int first_len = skb_pagelen(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) struct ip6_fraglist_iter iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) struct sk_buff *frag2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) if (first_len - hlen > mtu ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) ((first_len - hlen) & 7) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) skb_cloned(skb) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) skb_headroom(skb) < (hroom + sizeof(struct frag_hdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) goto slow_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) skb_walk_frags(skb, frag) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) /* Correct geometry. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) if (frag->len > mtu ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) ((frag->len & 7) && frag->next) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) goto slow_path_clean;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) /* Partially cloned skb? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) if (skb_shared(frag))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) goto slow_path_clean;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) BUG_ON(frag->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) if (skb->sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) frag->sk = skb->sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) frag->destructor = sock_wfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) skb->truesize -= frag->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) err = ip6_fraglist_init(skb, hlen, prevhdr, nexthdr, frag_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) &iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) /* Prepare header of the next frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) * before previous one went down. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) if (iter.frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) ip6_fraglist_prepare(skb, &iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) skb->tstamp = tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) err = output(net, sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) IPSTATS_MIB_FRAGCREATES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) if (err || !iter.frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) skb = ip6_fraglist_next(&iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) kfree(iter.tmp_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) if (err == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) IPSTATS_MIB_FRAGOKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) kfree_skb_list(iter.frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) IPSTATS_MIB_FRAGFAILS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) slow_path_clean:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) skb_walk_frags(skb, frag2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) if (frag2 == frag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) frag2->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) frag2->destructor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) skb->truesize += frag2->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) slow_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) * Fragment the datagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) ip6_frag_init(skb, hlen, mtu, rt->dst.dev->needed_tailroom,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) LL_RESERVED_SPACE(rt->dst.dev), prevhdr, nexthdr, frag_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) * Keep copying data until we run out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) while (state.left > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) frag = ip6_frag_next(skb, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) if (IS_ERR(frag)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) err = PTR_ERR(frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) * Put this fragment into the sending queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) frag->tstamp = tstamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) err = output(net, sk, frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) IPSTATS_MIB_FRAGCREATES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) IPSTATS_MIB_FRAGOKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) consume_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) fail_toobig:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) if (skb->sk && dst_allfrag(skb_dst(skb)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) err = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) IPSTATS_MIB_FRAGFAILS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) static inline int ip6_rt_check(const struct rt6key *rt_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) const struct in6_addr *fl_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) const struct in6_addr *addr_cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) struct dst_entry *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) const struct flowi6 *fl6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) struct rt6_info *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) if (!dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) if (dst->ops->family != AF_INET6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) dst_release(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) rt = (struct rt6_info *)dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) /* Yes, checking route validity in not connected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) * case is not very simple. Take into account,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) * that we do not support routing by source, TOS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) * and MSG_DONTROUTE --ANK (980726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) * 1. ip6_rt_check(): If route was host route,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) * check that cached destination is current.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) * If it is network route, we still may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) * check its validity using saved pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) * to the last used address: daddr_cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) * We do not want to save whole address now,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) * (because main consumer of this service
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) * is tcp, which has not this problem),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) * so that the last trick works only on connected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) * sockets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) * 2. oif also should be the same.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) #ifdef CONFIG_IPV6_SUBTREES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) (!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) dst_release(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) return dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) struct dst_entry **dst, struct flowi6 *fl6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) struct neighbour *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) struct rt6_info *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) /* The correct way to handle this would be to do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) * ip6_route_get_saddr, and then ip6_route_output; however,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) * the route-specific preferred source forces the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) * ip6_route_output call _before_ ip6_route_get_saddr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) * In source specific routing (no src=any default route),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) * ip6_route_output will fail given src=any saddr, though, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) * that's why we try it again later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) struct fib6_info *from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) struct rt6_info *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) bool had_dst = *dst != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) if (!had_dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) *dst = ip6_route_output(net, sk, fl6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) rt = (*dst)->error ? NULL : (struct rt6_info *)*dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) from = rt ? rcu_dereference(rt->from) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) err = ip6_route_get_saddr(net, from, &fl6->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) sk ? inet6_sk(sk)->srcprefs : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) &fl6->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) goto out_err_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) /* If we had an erroneous initial result, pretend it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) * never existed and let the SA-enabled version take
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) * over.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) if (!had_dst && (*dst)->error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) dst_release(*dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) if (fl6->flowi6_oif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) flags |= RT6_LOOKUP_F_IFACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) if (!*dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) *dst = ip6_route_output_flags(net, sk, fl6, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) err = (*dst)->error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) goto out_err_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) * Here if the dst entry we've looked up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) * has a neighbour entry that is in the INCOMPLETE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) * state and the src address from the flow is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) * marked as OPTIMISTIC, we release the found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) * dst entry and replace it instead with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) * dst entry of the nexthop router
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) rt = (struct rt6_info *) *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) n = __ipv6_neigh_lookup_noref(rt->dst.dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) rt6_nexthop(rt, &fl6->daddr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) struct inet6_ifaddr *ifp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) struct flowi6 fl_gw6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) int redirect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) ifp = ipv6_get_ifaddr(net, &fl6->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) (*dst)->dev, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) if (ifp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) in6_ifa_put(ifp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) if (redirect) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) * We need to get the dst entry for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) * default router instead
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) dst_release(*dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) memcpy(&fl_gw6, fl6, sizeof(struct flowi6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) *dst = ip6_route_output(net, sk, &fl_gw6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) err = (*dst)->error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) goto out_err_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) if (ipv6_addr_v4mapped(&fl6->saddr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) err = -EAFNOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) goto out_err_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) out_err_release:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) dst_release(*dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) if (err == -ENETUNREACH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) * ip6_dst_lookup - perform route lookup on flow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) * @net: Network namespace to perform lookup in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) * @sk: socket which provides route info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) * @dst: pointer to dst_entry * for result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) * @fl6: flow to lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) * This function performs a route lookup on the given flow.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) * It returns zero on success, or a standard errno code on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) struct flowi6 *fl6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) return ip6_dst_lookup_tail(net, sk, dst, fl6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) EXPORT_SYMBOL_GPL(ip6_dst_lookup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) * ip6_dst_lookup_flow - perform route lookup on flow with ipsec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) * @net: Network namespace to perform lookup in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) * @sk: socket which provides route info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) * @fl6: flow to lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) * @final_dst: final destination address for ipsec lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) * This function performs a route lookup on the given flow.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) * It returns a valid dst pointer on success, or a pointer encoded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) * error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) const struct in6_addr *final_dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) struct dst_entry *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) err = ip6_dst_lookup_tail(net, sk, &dst, fl6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) if (final_dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) fl6->daddr = *final_dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) return xfrm_lookup_route(net, dst, flowi6_to_flowi(fl6), sk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) * @sk: socket which provides the dst cache and route info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) * @fl6: flow to lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) * @final_dst: final destination address for ipsec lookup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) * @connected: whether @sk is connected or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) * This function performs a route lookup on the given flow with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) * possibility of using the cached route in the socket if it is valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) * It will take the socket dst lock when operating on the dst cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) * As a result, this function can only be used in process context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) * In addition, for a connected socket, cache the dst in the socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) * if the current cache is not valid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) * It returns a valid dst pointer on success, or a pointer encoded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) * error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) const struct in6_addr *final_dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) bool connected)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) dst = ip6_sk_dst_check(sk, dst, fl6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) if (dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) return dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) if (connected && !IS_ERR(dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) ip6_sk_dst_store_flow(sk, dst_clone(dst), fl6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) return dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) * ip6_dst_lookup_tunnel - perform route lookup on tunnel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) * @skb: Packet for which lookup is done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) * @dev: Tunnel device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) * @net: Network namespace of tunnel device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) * @sock: Socket which provides route info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) * @saddr: Memory to store the src ip address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) * @info: Tunnel information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) * @protocol: IP protocol
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) * @use_cache: Flag to enable cache usage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) * This function performs a route lookup on a tunnel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) * It returns a valid dst pointer and stores src address to be used in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) * tunnel in param saddr on success, else a pointer encoded error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) struct socket *sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) struct in6_addr *saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) const struct ip_tunnel_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) u8 protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) bool use_cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) struct dst_entry *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) #ifdef CONFIG_DST_CACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) struct dst_cache *dst_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) struct flowi6 fl6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) __u8 prio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) #ifdef CONFIG_DST_CACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) dst_cache = (struct dst_cache *)&info->dst_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) if (use_cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) dst = dst_cache_get_ip6(dst_cache, saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) if (dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) return dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) memset(&fl6, 0, sizeof(fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) fl6.flowi6_mark = skb->mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) fl6.flowi6_proto = protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) fl6.daddr = info->key.u.ipv6.dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) fl6.saddr = info->key.u.ipv6.src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) prio = info->key.tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) fl6.flowlabel = ip6_make_flowinfo(RT_TOS(prio),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) info->key.label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) if (IS_ERR(dst)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) return ERR_PTR(-ENETUNREACH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) if (dst->dev == dev) { /* is this necessary? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) netdev_dbg(dev, "circular route to %pI6\n", &fl6.daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) dst_release(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) return ERR_PTR(-ELOOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) #ifdef CONFIG_DST_CACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) if (use_cache)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) dst_cache_set_ip6(dst_cache, dst, &fl6.saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) *saddr = fl6.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) return dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) EXPORT_SYMBOL_GPL(ip6_dst_lookup_tunnel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) gfp_t gfp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) static void ip6_append_data_mtu(unsigned int *mtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) int *maxfraglen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) unsigned int fragheaderlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) struct rt6_info *rt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) unsigned int orig_mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) /* first fragment, reserve header_len */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) *mtu = orig_mtu - rt->dst.header_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) * this fragment is not first, the headers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) * space is regarded as data space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) *mtu = orig_mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) *maxfraglen = ((*mtu - fragheaderlen) & ~7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) + fragheaderlen - sizeof(struct frag_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) struct rt6_info *rt, struct flowi6 *fl6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) unsigned int mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) struct ipv6_txoptions *opt = ipc6->opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) * setup for corking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) if (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) if (WARN_ON(v6_cork->opt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) if (unlikely(!v6_cork->opt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) v6_cork->opt->tot_len = sizeof(*opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) v6_cork->opt->opt_flen = opt->opt_flen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) v6_cork->opt->opt_nflen = opt->opt_nflen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) sk->sk_allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) if (opt->dst0opt && !v6_cork->opt->dst0opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) sk->sk_allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) if (opt->dst1opt && !v6_cork->opt->dst1opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) sk->sk_allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) if (opt->hopopt && !v6_cork->opt->hopopt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) sk->sk_allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) if (opt->srcrt && !v6_cork->opt->srcrt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) /* need source address above miyazawa*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) dst_hold(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) cork->base.dst = &rt->dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) cork->fl.u.ip6 = *fl6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) v6_cork->hop_limit = ipc6->hlimit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) v6_cork->tclass = ipc6->tclass;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) if (rt->dst.flags & DST_XFRM_TUNNEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) if (np->frag_size < mtu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) if (np->frag_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) mtu = np->frag_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) cork->base.fragsize = mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) cork->base.gso_size = ipc6->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) cork->base.tx_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) cork->base.mark = ipc6->sockc.mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) sock_tx_timestamp(sk, ipc6->sockc.tsflags, &cork->base.tx_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) if (dst_allfrag(xfrm_dst_path(&rt->dst)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) cork->base.flags |= IPCORK_ALLFRAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) cork->base.length = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) cork->base.transmit_time = ipc6->sockc.transmit_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) static int __ip6_append_data(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) struct flowi6 *fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) struct sk_buff_head *queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) struct inet_cork *cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) struct inet6_cork *v6_cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) struct page_frag *pfrag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) int getfrag(void *from, char *to, int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) int len, int odd, struct sk_buff *skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) void *from, int length, int transhdrlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) unsigned int flags, struct ipcm6_cookie *ipc6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) struct sk_buff *skb, *skb_prev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) struct ubuf_info *uarg = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) int exthdrlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) int dst_exthdrlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) int hh_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) int copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) int offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) u32 tskey = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) struct rt6_info *rt = (struct rt6_info *)cork->dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) struct ipv6_txoptions *opt = v6_cork->opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) int csummode = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) unsigned int maxnonfragsize, headersize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) unsigned int wmem_alloc_delta = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) bool paged, extra_uref = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) skb = skb_peek_tail(queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) exthdrlen = opt ? opt->opt_flen : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) paged = !!cork->gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) orig_mtu = mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) if (cork->tx_flags & SKBTX_ANY_SW_TSTAMP &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) tskey = sk->sk_tskey++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) hh_len = LL_RESERVED_SPACE(rt->dst.dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) (opt ? opt->opt_nflen : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) headersize = sizeof(struct ipv6hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) (opt ? opt->opt_flen + opt->opt_nflen : 0) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) (dst_allfrag(&rt->dst) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) sizeof(struct frag_hdr) : 0) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) rt->rt6i_nfheader_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) if (mtu <= fragheaderlen ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) ((mtu - fragheaderlen) & ~7) + fragheaderlen <= sizeof(struct frag_hdr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) goto emsgsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) sizeof(struct frag_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) /* as per RFC 7112 section 5, the entire IPv6 Header Chain must fit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) * the first fragment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) if (headersize + transhdrlen > mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) goto emsgsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) if (cork->length + length > mtu - headersize && ipc6->dontfrag &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) (sk->sk_protocol == IPPROTO_UDP ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) sk->sk_protocol == IPPROTO_RAW)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) ipv6_local_rxpmtu(sk, fl6, mtu - headersize +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) sizeof(struct ipv6hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) goto emsgsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) if (ip6_sk_ignore_df(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) maxnonfragsize = mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) if (cork->length + length > maxnonfragsize - headersize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) emsgsize:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) pmtu = max_t(int, mtu - headersize + sizeof(struct ipv6hdr), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) ipv6_local_error(sk, EMSGSIZE, fl6, pmtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) /* CHECKSUM_PARTIAL only with no extension headers and when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) * we are not going to fragment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) if (transhdrlen && sk->sk_protocol == IPPROTO_UDP &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) headersize == sizeof(struct ipv6hdr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) length <= mtu - headersize &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) (!(flags & MSG_MORE) || cork->gso_size) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) csummode = CHECKSUM_PARTIAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) if (flags & MSG_ZEROCOPY && length && sock_flag(sk, SOCK_ZEROCOPY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) uarg = sock_zerocopy_realloc(sk, length, skb_zcopy(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) if (!uarg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) extra_uref = !skb_zcopy(skb); /* only ref on new uarg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) if (rt->dst.dev->features & NETIF_F_SG &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) csummode == CHECKSUM_PARTIAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) paged = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) uarg->zerocopy = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) skb_zcopy_set(skb, uarg, &extra_uref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) * Let's try using as much space as possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) * Use MTU if total length of the message fits into the MTU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) * Otherwise, we need to reserve fragment header and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) * fragment alignment (= 8-15 octects, in total).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) * Note that we may need to "move" the data from the tail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) * of the buffer to the new fragment when we split
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) * the message.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) * FIXME: It may be fragmented into multiple chunks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) * at once if non-fragmentable extension headers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) * are too large.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) * --yoshfuji
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) cork->length += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) goto alloc_new_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) while (length > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) /* Check if the remaining data fits into current packet. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) if (copy < length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) copy = maxfraglen - skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) if (copy <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) char *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) unsigned int datalen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) unsigned int fraglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) unsigned int fraggap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) unsigned int alloclen, alloc_extra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) unsigned int pagedlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) alloc_new_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) /* There's no room in the current skb */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) if (skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) fraggap = skb->len - maxfraglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) fraggap = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) /* update mtu and maxfraglen if necessary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) if (!skb || !skb_prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) ip6_append_data_mtu(&mtu, &maxfraglen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) fragheaderlen, skb, rt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) orig_mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) skb_prev = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) * If remaining data exceeds the mtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) * we know we need more fragment(s).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) datalen = length + fraggap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) fraglen = datalen + fragheaderlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) pagedlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) alloc_extra = hh_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) alloc_extra += dst_exthdrlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) alloc_extra += rt->dst.trailer_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) /* We just reserve space for fragment header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) * Note: this may be overallocation if the message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) * (without MSG_MORE) fits into the MTU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) alloc_extra += sizeof(struct frag_hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) if ((flags & MSG_MORE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) !(rt->dst.dev->features&NETIF_F_SG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) alloclen = mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) else if (!paged &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) (fraglen + alloc_extra < SKB_MAX_ALLOC ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) !(rt->dst.dev->features & NETIF_F_SG)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) alloclen = fraglen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) alloclen = min_t(int, fraglen, MAX_HEADER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) pagedlen = fraglen - alloclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) alloclen += alloc_extra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) if (datalen != length + fraggap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) * this is not the last fragment, the trailer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) * space is regarded as data space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) datalen += rt->dst.trailer_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) fraglen = datalen + fragheaderlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) copy = datalen - transhdrlen - fraggap - pagedlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) if (copy < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) if (transhdrlen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) skb = sock_alloc_send_skb(sk, alloclen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) (flags & MSG_DONTWAIT), &err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) if (refcount_read(&sk->sk_wmem_alloc) + wmem_alloc_delta <=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) 2 * sk->sk_sndbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) skb = alloc_skb(alloclen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) sk->sk_allocation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) if (unlikely(!skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) err = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) * Fill in the control structures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) skb->protocol = htons(ETH_P_IPV6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) skb->ip_summed = csummode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) skb->csum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) /* reserve for fragmentation and ipsec header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) dst_exthdrlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) * Find where to start putting bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) data = skb_put(skb, fraglen - pagedlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) skb_set_network_header(skb, exthdrlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) data += fragheaderlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) skb->transport_header = (skb->network_header +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) fragheaderlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) if (fraggap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) skb->csum = skb_copy_and_csum_bits(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) skb_prev, maxfraglen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) data + transhdrlen, fraggap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) skb_prev->csum = csum_sub(skb_prev->csum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) skb->csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) data += fraggap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) pskb_trim_unique(skb_prev, maxfraglen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) if (copy > 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) getfrag(from, data + transhdrlen, offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) copy, fraggap, skb) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) offset += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) length -= copy + transhdrlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) transhdrlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) exthdrlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) dst_exthdrlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) /* Only the initial fragment is time stamped */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) skb_shinfo(skb)->tx_flags = cork->tx_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) cork->tx_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) skb_shinfo(skb)->tskey = tskey;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) tskey = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) skb_zcopy_set(skb, uarg, &extra_uref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) if ((flags & MSG_CONFIRM) && !skb_prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) skb_set_dst_pending_confirm(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) * Put the packet on the pending queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) if (!skb->destructor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) skb->destructor = sock_wfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) skb->sk = sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) wmem_alloc_delta += skb->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) __skb_queue_tail(queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) if (copy > length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) copy = length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) if (!(rt->dst.dev->features&NETIF_F_SG) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) skb_tailroom(skb) >= copy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) unsigned int off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) off = skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) if (getfrag(from, skb_put(skb, copy),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) offset, copy, off, skb) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) __skb_trim(skb, off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) } else if (!uarg || !uarg->zerocopy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) int i = skb_shinfo(skb)->nr_frags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) if (!sk_page_frag_refill(sk, pfrag))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) if (!skb_can_coalesce(skb, i, pfrag->page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) pfrag->offset)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) err = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) if (i == MAX_SKB_FRAGS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) __skb_fill_page_desc(skb, i, pfrag->page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) pfrag->offset, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) skb_shinfo(skb)->nr_frags = ++i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) get_page(pfrag->page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) copy = min_t(int, copy, pfrag->size - pfrag->offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) if (getfrag(from,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) page_address(pfrag->page) + pfrag->offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) offset, copy, skb->len, skb) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) goto error_efault;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) pfrag->offset += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) skb->len += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) skb->data_len += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) skb->truesize += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) wmem_alloc_delta += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) err = skb_zerocopy_iter_dgram(skb, from, copy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) offset += copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) length -= copy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) if (wmem_alloc_delta)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) error_efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) if (uarg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) sock_zerocopy_put_abort(uarg, extra_uref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) cork->length -= length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) int ip6_append_data(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) int getfrag(void *from, char *to, int offset, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) int odd, struct sk_buff *skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) void *from, int length, int transhdrlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) struct rt6_info *rt, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) struct inet_sock *inet = inet_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) int exthdrlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) if (flags&MSG_PROBE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) if (skb_queue_empty(&sk->sk_write_queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817) * setup for corking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) err = ip6_setup_cork(sk, &inet->cork, &np->cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) ipc6, rt, fl6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824) exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) length += exthdrlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) transhdrlen += exthdrlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) fl6 = &inet->cork.fl.u.ip6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) transhdrlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) &np->cork, sk_page_frag(sk), getfrag,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) from, length, transhdrlen, flags, ipc6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) EXPORT_SYMBOL_GPL(ip6_append_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) static void ip6_cork_release(struct inet_cork_full *cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) struct inet6_cork *v6_cork)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) if (v6_cork->opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) kfree(v6_cork->opt->dst0opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) kfree(v6_cork->opt->dst1opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) kfree(v6_cork->opt->hopopt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) kfree(v6_cork->opt->srcrt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) kfree(v6_cork->opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) v6_cork->opt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) if (cork->base.dst) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) dst_release(cork->base.dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) cork->base.dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) cork->base.flags &= ~IPCORK_ALLFRAG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) memset(&cork->fl, 0, sizeof(cork->fl));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) struct sk_buff *__ip6_make_skb(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) struct sk_buff_head *queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) struct inet_cork_full *cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) struct inet6_cork *v6_cork)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) struct sk_buff *skb, *tmp_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) struct sk_buff **tail_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) struct ipv6hdr *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) struct ipv6_txoptions *opt = v6_cork->opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) struct rt6_info *rt = (struct rt6_info *)cork->base.dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) struct flowi6 *fl6 = &cork->fl.u.ip6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) unsigned char proto = fl6->flowi6_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) skb = __skb_dequeue(queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877) tail_skb = &(skb_shinfo(skb)->frag_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) /* move skb->data to ip header from ext header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) if (skb->data < skb_network_header(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) __skb_pull(skb, skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) while ((tmp_skb = __skb_dequeue(queue)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) __skb_pull(tmp_skb, skb_network_header_len(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) *tail_skb = tmp_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) tail_skb = &(tmp_skb->next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) skb->len += tmp_skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) skb->data_len += tmp_skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) skb->truesize += tmp_skb->truesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889) tmp_skb->destructor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) tmp_skb->sk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) /* Allow local fragmentation. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) skb->ignore_df = ip6_sk_ignore_df(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) *final_dst = fl6->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) __skb_pull(skb, skb_network_header_len(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) if (opt && opt->opt_flen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) ipv6_push_frag_opts(skb, opt, &proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) if (opt && opt->opt_nflen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst, &fl6->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) skb_push(skb, sizeof(struct ipv6hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) hdr = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907) ip6_flow_hdr(hdr, v6_cork->tclass,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) ip6_make_flowlabel(net, skb, fl6->flowlabel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) ip6_autoflowlabel(net, np), fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) hdr->hop_limit = v6_cork->hop_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) hdr->nexthdr = proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912) hdr->saddr = fl6->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) hdr->daddr = *final_dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915) skb->priority = sk->sk_priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) skb->mark = cork->base.mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) skb->tstamp = cork->base.transmit_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) skb_dst_set(skb, dst_clone(&rt->dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) if (proto == IPPROTO_ICMPV6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) ip6_cork_release(cork, v6_cork);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) return skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) int ip6_send_skb(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) struct net *net = sock_net(skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) err = ip6_local_out(net, skb->sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) if (err > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) err = net_xmit_errno(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945) IP6_INC_STATS(net, rt->rt6i_idev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) int ip6_push_pending_frames(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956) skb = ip6_finish_skb(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960) return ip6_send_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) static void __ip6_flush_pending_frames(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) struct sk_buff_head *queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966) struct inet_cork_full *cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) struct inet6_cork *v6_cork)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971) while ((skb = __skb_dequeue_tail(queue)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) if (skb_dst(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) IPSTATS_MIB_OUTDISCARDS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) ip6_cork_release(cork, v6_cork);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) void ip6_flush_pending_frames(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983) __ip6_flush_pending_frames(sk, &sk->sk_write_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984) &inet_sk(sk)->cork, &inet6_sk(sk)->cork);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988) struct sk_buff *ip6_make_skb(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989) int getfrag(void *from, char *to, int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990) int len, int odd, struct sk_buff *skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991) void *from, int length, int transhdrlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993) struct rt6_info *rt, unsigned int flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994) struct inet_cork_full *cork)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996) struct inet6_cork v6_cork;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997) struct sk_buff_head queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001) if (flags & MSG_PROBE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004) __skb_queue_head_init(&queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006) cork->base.flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) cork->base.addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008) cork->base.opt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009) cork->base.dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010) v6_cork.opt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011) err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt, fl6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013) ip6_cork_release(cork, &v6_cork);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016) if (ipc6->dontfrag < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) ipc6->dontfrag = inet6_sk(sk)->dontfrag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019) err = __ip6_append_data(sk, fl6, &queue, &cork->base, &v6_cork,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) ¤t->task_frag, getfrag, from,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) length + exthdrlen, transhdrlen + exthdrlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022) flags, ipc6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) __ip6_flush_pending_frames(sk, &queue, cork, &v6_cork);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) return __ip6_make_skb(sk, &queue, cork, &v6_cork);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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