^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) * DCCP over IPv6
^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) * Based on net/dccp6/ipv6.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <net/addrconf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <net/inet_common.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <net/inet_hashtables.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <net/inet_sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <net/inet6_connection_sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <net/inet6_hashtables.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <net/ip6_route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <net/transp_v6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <net/ip6_checksum.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <net/secure_seq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include "dccp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include "ipv6.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include "feat.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static const struct inet_connection_sock_af_ops dccp_ipv6_mapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* add pseudo-header to DCCP checksum stored in skb->csum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) const struct in6_addr *saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) const struct in6_addr *daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct dccp_hdr *dh = dccp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) dccp_csum_outgoing(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ipv6_hdr(skb)->saddr.s6_addr32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) dccp_hdr(skb)->dccph_dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) dccp_hdr(skb)->dccph_sport );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) u8 type, u8 code, int offset, __be32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) const struct dccp_hdr *dh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct dccp_sock *dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct ipv6_pinfo *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) __u64 seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct net *net = dev_net(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /* Only need dccph_dport & dccph_sport which are the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * 4 bytes in dccp header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * Our caller (icmpv6_notify()) already pulled 8 bytes for us.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) dh = (struct dccp_hdr *)(skb->data + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) sk = __inet6_lookup_established(net, &dccp_hashinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) &hdr->daddr, dh->dccph_dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) &hdr->saddr, ntohs(dh->dccph_sport),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) inet6_iif(skb), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ICMP6_MIB_INERRORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (sk->sk_state == DCCP_TIME_WAIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) inet_twsk_put(inet_twsk(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) seq = dccp_hdr_seq(dh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (sk->sk_state == DCCP_NEW_SYN_RECV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) dccp_req_err(sk, seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) bh_lock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (sock_owned_by_user(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (sk->sk_state == DCCP_CLOSED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) dp = dccp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (type == NDISC_REDIRECT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (!sock_owned_by_user(sk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) dst->ops->redirect(dst, sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (type == ICMPV6_PKT_TOOBIG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct dst_entry *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!ip6_sk_accept_pmtu(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (sock_owned_by_user(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) dst = inet6_csk_update_pmtu(sk, ntohl(info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (!dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) dccp_sync_mss(sk, dst_mtu(dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) icmpv6_err_convert(type, code, &err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /* Might be for an request_sock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) switch (sk->sk_state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) case DCCP_REQUESTING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) case DCCP_RESPOND: /* Cannot happen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) It can, it SYNs are crossed. --ANK */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (!sock_owned_by_user(sk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) sk->sk_err = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * Wake people up to see the error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * (see connect in sock.c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) dccp_done(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) sk->sk_err_soft = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) goto out;
^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) if (!sock_owned_by_user(sk) && np->recverr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) sk->sk_err = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) sk->sk_error_report(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) sk->sk_err_soft = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) bh_unlock_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) struct inet_request_sock *ireq = inet_rsk(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct in6_addr *final_p, final;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct flowi6 fl6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) int err = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct dst_entry *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) memset(&fl6, 0, sizeof(fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) fl6.flowi6_proto = IPPROTO_DCCP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) fl6.daddr = ireq->ir_v6_rmt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) fl6.saddr = ireq->ir_v6_loc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) fl6.flowlabel = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) fl6.flowi6_oif = ireq->ir_iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) fl6.fl6_dport = ireq->ir_rmt_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) fl6.fl6_sport = htons(ireq->ir_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) security_req_classify_flow(req, flowi6_to_flowi(&fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (IS_ERR(dst)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) err = PTR_ERR(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) skb = dccp_make_response(sk, dst, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (skb != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct dccp_hdr *dh = dccp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct ipv6_txoptions *opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) dh->dccph_checksum = dccp_v6_csum_finish(skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) &ireq->ir_v6_loc_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) &ireq->ir_v6_rmt_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) fl6.daddr = ireq->ir_v6_rmt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) opt = ireq->ipv6_opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (!opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) opt = rcu_dereference(np->opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) sk->sk_priority);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) err = net_xmit_eval(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) dst_release(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static void dccp_v6_reqsk_destructor(struct request_sock *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) kfree(inet_rsk(req)->ipv6_opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) kfree_skb(inet_rsk(req)->pktopts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) const struct ipv6hdr *rxip6h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) struct flowi6 fl6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct net *net = dev_net(skb_dst(rxskb)->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct sock *ctl_sk = net->dccp.v6_ctl_sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct dst_entry *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (!ipv6_unicast_destination(rxskb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) skb = dccp_ctl_make_reset(ctl_sk, rxskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (skb == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) rxip6h = ipv6_hdr(rxskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) &rxip6h->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) memset(&fl6, 0, sizeof(fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) fl6.daddr = rxip6h->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) fl6.saddr = rxip6h->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) fl6.flowi6_proto = IPPROTO_DCCP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) fl6.flowi6_oif = inet6_iif(rxskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) fl6.fl6_dport = dccp_hdr(skb)->dccph_dport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) fl6.fl6_sport = dccp_hdr(skb)->dccph_sport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) security_skb_classify_flow(rxskb, flowi6_to_flowi(&fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /* sk = NULL, but it is safe for now. RST socket required. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (!IS_ERR(dst)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) skb_dst_set(skb, dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) DCCP_INC_STATS(DCCP_MIB_OUTRSTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static struct request_sock_ops dccp6_request_sock_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) .family = AF_INET6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) .obj_size = sizeof(struct dccp6_request_sock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) .rtx_syn_ack = dccp_v6_send_response,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) .send_ack = dccp_reqsk_send_ack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) .destructor = dccp_v6_reqsk_destructor,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) .send_reset = dccp_v6_ctl_send_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) .syn_ack_timeout = dccp_syn_ack_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct request_sock *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) struct dccp_request_sock *dreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) struct inet_request_sock *ireq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) if (skb->protocol == htons(ETH_P_IP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) return dccp_v4_conn_request(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (!ipv6_unicast_destination(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return 0; /* discard, don't send a reset here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) __IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (dccp_bad_service_code(sk, service)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * There are no SYN attacks on IPv6, yet...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (inet_csk_reqsk_queue_is_full(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (sk_acceptq_is_full(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) if (req == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (dccp_reqsk_init(req, dccp_sk(sk), skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) goto drop_and_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) dreq = dccp_rsk(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (dccp_parse_options(sk, dreq, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) goto drop_and_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (security_inet_conn_request(sk, skb, req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) goto drop_and_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) ireq = inet_rsk(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) ireq->ireq_family = AF_INET6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) ireq->ir_mark = inet_request_mark(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) refcount_inc(&skb->users);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) ireq->pktopts = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) ireq->ir_iif = sk->sk_bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) /* So that link locals have meaning */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (!sk->sk_bound_dev_if &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) ireq->ir_iif = inet6_iif(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * Step 3: Process LISTEN state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) dreq->dreq_isr = dcb->dccpd_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) dreq->dreq_gsr = dreq->dreq_isr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) dreq->dreq_iss = dccp_v6_init_sequence(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) dreq->dreq_gss = dreq->dreq_iss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) dreq->dreq_service = service;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) if (dccp_v6_send_response(sk, req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) goto drop_and_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) reqsk_put(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) drop_and_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) reqsk_free(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct request_sock *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct dst_entry *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct request_sock *req_unhash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) bool *own_req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct inet_request_sock *ireq = inet_rsk(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct ipv6_pinfo *newnp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) const struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) struct ipv6_txoptions *opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct inet_sock *newinet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct dccp6_sock *newdp6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) struct sock *newsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) if (skb->protocol == htons(ETH_P_IP)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * v6 mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) newsk = dccp_v4_request_recv_sock(sk, skb, req, dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) req_unhash, own_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) if (newsk == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) newdp6 = (struct dccp6_sock *)newsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) newinet = inet_sk(newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) newinet->pinet6 = &newdp6->inet6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) newnp = inet6_sk(newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) memcpy(newnp, np, sizeof(struct ipv6_pinfo));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) newnp->saddr = newsk->sk_v6_rcv_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) newsk->sk_backlog_rcv = dccp_v4_do_rcv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) newnp->pktoptions = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) newnp->opt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) newnp->ipv6_mc_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) newnp->ipv6_ac_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) newnp->ipv6_fl_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) newnp->mcast_oif = inet_iif(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) newnp->mcast_hops = ip_hdr(skb)->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * No need to charge this sock to the relevant IPv6 refcnt debug socks count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) * here, dccp_create_openreq_child now does this for us, see the comment in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) * that function for the gory details. -acme
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) /* It is tricky place. Until this moment IPv4 tcp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) worked with IPv6 icsk.icsk_af_ops.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) Sync it now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) return newsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (sk_acceptq_is_full(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) goto out_overflow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (!dst) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) struct flowi6 fl6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (!dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) newsk = dccp_create_openreq_child(sk, req, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (newsk == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) goto out_nonewsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) * No need to charge this sock to the relevant IPv6 refcnt debug socks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) * count here, dccp_create_openreq_child now does this for us, see the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * comment in that function for the gory details. -acme
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) ip6_dst_store(newsk, dst, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) NETIF_F_TSO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) newdp6 = (struct dccp6_sock *)newsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) newinet = inet_sk(newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) newinet->pinet6 = &newdp6->inet6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) newnp = inet6_sk(newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) memcpy(newnp, np, sizeof(struct ipv6_pinfo));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) newnp->saddr = ireq->ir_v6_loc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) newsk->sk_bound_dev_if = ireq->ir_iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /* Now IPv6 options...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) First: no IPv4 options.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) newinet->inet_opt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) /* Clone RX bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) newnp->rxopt.all = np->rxopt.all;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) newnp->ipv6_mc_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) newnp->ipv6_ac_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) newnp->ipv6_fl_list = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) newnp->pktoptions = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) newnp->opt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) newnp->mcast_oif = inet6_iif(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * Clone native IPv6 options from listening socket (if any)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * Yes, keeping reference count would be much more clever, but we make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * one more one thing there: reattach optmem to newsk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) opt = ireq->ipv6_opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (!opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) opt = rcu_dereference(np->opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) if (opt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) opt = ipv6_dup_options(newsk, opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) RCU_INIT_POINTER(newnp->opt, opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) inet_csk(newsk)->icsk_ext_hdr_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) opt->opt_flen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) dccp_sync_mss(newsk, dst_mtu(dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) if (__inet_inherit_port(sk, newsk) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) inet_csk_prepare_forced_close(newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) dccp_done(newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) /* Clone pktoptions received with SYN, if we own the req */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (*own_req && ireq->pktopts) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) consume_skb(ireq->pktopts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) ireq->pktopts = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (newnp->pktoptions)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) skb_set_owner_r(newnp->pktoptions, newsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) return newsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) out_overflow:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) out_nonewsk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) dst_release(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) /* The socket must have it's spinlock held when we get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) * here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) * We have a potential double-lock case here, so even when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) * doing backlog processing we use the BH locking scheme.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * This is because we cannot sleep with the original spinlock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) * held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) struct sk_buff *opt_skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) /* Imagine: socket is IPv6. IPv4 packet arrives,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) goes to IPv4 receive handler and backlogged.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) From backlog it always goes here. Kerboom...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) Fortunately, dccp_rcv_established and rcv_established
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) handle them correctly, but it is not case with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (skb->protocol == htons(ETH_P_IP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) return dccp_v4_do_rcv(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) if (sk_filter(sk, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) goto discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) * socket locking is here for SMP purposes as backlog rcv is currently
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) * called with bh processing disabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) /* Do Stevens' IPV6_PKTOPTIONS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) Yes, guys, it is the only place in our code, where we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) may make it not affecting IPv4.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) The rest of code is protocol independent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) and I do not like idea to uglify IPv4.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) Actually, all the idea behind IPV6_PKTOPTIONS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) looks not very well thought. For now we latch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) options, received in the last packet, enqueued
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) by tcp. Feel free to propose better solution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) --ANK (980728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) if (np->rxopt.all)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) opt_skb = skb_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) if (sk->sk_state == DCCP_OPEN) { /* Fast path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) goto reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if (opt_skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) goto ipv6_pktoptions;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) * Step 3: Process LISTEN state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) * If S.state == LISTEN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) * If P.type == Request or P contains a valid Init Cookie option,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) * (* Must scan the packet's options to check for Init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * Cookies. Only Init Cookies are processed here,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * however; other options are processed in Step 8. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) * scan need only be performed if the endpoint uses Init
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) * Cookies *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) * (* Generate a new socket and switch to that socket *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) * Set S := new socket for this port pair
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) * S.state = RESPOND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) * Choose S.ISS (initial seqno) or set from Init Cookies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) * Initialize S.GAR := S.ISS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) * Continue with S.state == RESPOND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * (* A Response packet will be generated in Step 11 *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) * Otherwise,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * Generate Reset(No Connection) unless P.type == Reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) * Drop packet and return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) * NOTE: the check for the packet types is done in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) * dccp_rcv_state_process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) goto reset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (opt_skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) goto ipv6_pktoptions;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) reset:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) dccp_v6_ctl_send_reset(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) discard:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) if (opt_skb != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) __kfree_skb(opt_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) /* Handling IPV6_PKTOPTIONS skb the similar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) * way it's done for net/ipv6/tcp_ipv6.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) ipv6_pktoptions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) np->mcast_oif = inet6_iif(opt_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) if (np->repflow)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) if (ipv6_opt_accepted(sk, opt_skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) &DCCP_SKB_CB(opt_skb)->header.h6)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) skb_set_owner_r(opt_skb, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) memmove(IP6CB(opt_skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) &DCCP_SKB_CB(opt_skb)->header.h6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) sizeof(struct inet6_skb_parm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) opt_skb = xchg(&np->pktoptions, opt_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) __kfree_skb(opt_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) opt_skb = xchg(&np->pktoptions, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) kfree_skb(opt_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) static int dccp_v6_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) const struct dccp_hdr *dh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) bool refcounted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) int min_cov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) /* Step 1: Check header basics */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) if (dccp_invalid_packet(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) goto discard_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) /* Step 1: If header checksum is incorrect, drop packet and return. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) &ipv6_hdr(skb)->daddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) DCCP_WARN("dropped packet with invalid checksum\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) goto discard_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) dh = dccp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (dccp_packet_without_ack(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) lookup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) dh->dccph_sport, dh->dccph_dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) inet6_iif(skb), 0, &refcounted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if (!sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) dccp_pr_debug("failed to look up flow ID in table and "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) "get corresponding socket\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) goto no_dccp_socket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) * Step 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) * ... or S.state == TIMEWAIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) * Generate Reset(No Connection) unless P.type == Reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) * Drop packet and return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) if (sk->sk_state == DCCP_TIME_WAIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) inet_twsk_put(inet_twsk(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) goto no_dccp_socket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) if (sk->sk_state == DCCP_NEW_SYN_RECV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) struct request_sock *req = inet_reqsk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) struct sock *nsk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) sk = req->rsk_listener;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) if (unlikely(sk->sk_state != DCCP_LISTEN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) inet_csk_reqsk_queue_drop_and_put(sk, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) goto lookup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) sock_hold(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) refcounted = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) nsk = dccp_check_req(sk, skb, req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) if (!nsk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) reqsk_put(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) goto discard_and_relse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) if (nsk == sk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) reqsk_put(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) } else if (dccp_child_process(sk, nsk, skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) dccp_v6_ctl_send_reset(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) goto discard_and_relse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) min_cov = dccp_sk(sk)->dccps_pcrlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) dh->dccph_cscov, min_cov);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) goto discard_and_relse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) goto discard_and_relse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) refcounted) ? -1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) no_dccp_socket:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) goto discard_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) * Step 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) * If no socket ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) * Generate Reset(No Connection) unless P.type == Reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) * Drop packet and return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) if (dh->dccph_type != DCCP_PKT_RESET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) DCCP_SKB_CB(skb)->dccpd_reset_code =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) DCCP_RESET_CODE_NO_CONNECTION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) dccp_v6_ctl_send_reset(sk, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) discard_it:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) discard_and_relse:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) if (refcounted)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) sock_put(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) goto discard_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) int addr_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) struct inet_connection_sock *icsk = inet_csk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) struct inet_sock *inet = inet_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) struct dccp_sock *dp = dccp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) struct in6_addr *saddr = NULL, *final_p, final;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) struct ipv6_txoptions *opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) struct flowi6 fl6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) struct dst_entry *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) int addr_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) dp->dccps_role = DCCP_ROLE_CLIENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) if (addr_len < SIN6_LEN_RFC2133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (usin->sin6_family != AF_INET6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) return -EAFNOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) memset(&fl6, 0, sizeof(fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) if (np->sndflow) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) IP6_ECN_flow_init(fl6.flowlabel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) struct ip6_flowlabel *flowlabel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) if (IS_ERR(flowlabel))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) fl6_sock_release(flowlabel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * connect() to INADDR_ANY means loopback (BSD'ism).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) if (ipv6_addr_any(&usin->sin6_addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) usin->sin6_addr.s6_addr[15] = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) addr_type = ipv6_addr_type(&usin->sin6_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) if (addr_type & IPV6_ADDR_MULTICAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) return -ENETUNREACH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) if (addr_type & IPV6_ADDR_LINKLOCAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) if (addr_len >= sizeof(struct sockaddr_in6) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) usin->sin6_scope_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) /* If interface is set while binding, indices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) * must coincide.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) if (sk->sk_bound_dev_if &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) sk->sk_bound_dev_if != usin->sin6_scope_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) sk->sk_bound_dev_if = usin->sin6_scope_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) /* Connect to link-local address requires an interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) if (!sk->sk_bound_dev_if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) sk->sk_v6_daddr = usin->sin6_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) np->flow_label = fl6.flowlabel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) * DCCP over IPv4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) if (addr_type == IPV6_ADDR_MAPPED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) u32 exthdrlen = icsk->icsk_ext_hdr_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) struct sockaddr_in sin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) if (__ipv6_only_sock(sk))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) return -ENETUNREACH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) sin.sin_family = AF_INET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) sin.sin_port = usin->sin6_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) icsk->icsk_af_ops = &dccp_ipv6_mapped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) sk->sk_backlog_rcv = dccp_v4_do_rcv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) icsk->icsk_ext_hdr_len = exthdrlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) icsk->icsk_af_ops = &dccp_ipv6_af_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) sk->sk_backlog_rcv = dccp_v6_do_rcv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) goto failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) np->saddr = sk->sk_v6_rcv_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) saddr = &sk->sk_v6_rcv_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) fl6.flowi6_proto = IPPROTO_DCCP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) fl6.daddr = sk->sk_v6_daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) fl6.saddr = saddr ? *saddr : np->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) fl6.flowi6_oif = sk->sk_bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) fl6.fl6_dport = usin->sin6_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) fl6.fl6_sport = inet->inet_sport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) final_p = fl6_update_dst(&fl6, opt, &final);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) if (IS_ERR(dst)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) err = PTR_ERR(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) goto failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) if (saddr == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) saddr = &fl6.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) sk->sk_v6_rcv_saddr = *saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) /* set the source address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) np->saddr = *saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) inet->inet_rcv_saddr = LOOPBACK4_IPV6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) ip6_dst_store(sk, dst, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) icsk->icsk_ext_hdr_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) if (opt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) inet->inet_dport = usin->sin6_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) dccp_set_state(sk, DCCP_REQUESTING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) err = inet6_hash_connect(&dccp_death_row, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) goto late_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) sk->sk_v6_daddr.s6_addr32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) inet->inet_sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) inet->inet_dport);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) err = dccp_connect(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) goto late_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) late_failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) dccp_set_state(sk, DCCP_CLOSED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) __sk_dst_reset(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) inet->inet_dport = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) sk->sk_route_caps = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) .queue_xmit = inet6_csk_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) .send_check = dccp_v6_send_check,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) .rebuild_header = inet6_sk_rebuild_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) .conn_request = dccp_v6_conn_request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) .syn_recv_sock = dccp_v6_request_recv_sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) .net_header_len = sizeof(struct ipv6hdr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) .setsockopt = ipv6_setsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) .getsockopt = ipv6_getsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) .addr2sockaddr = inet6_csk_addr2sockaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) .sockaddr_len = sizeof(struct sockaddr_in6),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) * DCCP over IPv4 via INET6 API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) .queue_xmit = ip_queue_xmit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) .send_check = dccp_v4_send_check,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) .rebuild_header = inet_sk_rebuild_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) .conn_request = dccp_v6_conn_request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) .syn_recv_sock = dccp_v6_request_recv_sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) .net_header_len = sizeof(struct iphdr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) .setsockopt = ipv6_setsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) .getsockopt = ipv6_getsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) .addr2sockaddr = inet6_csk_addr2sockaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) .sockaddr_len = sizeof(struct sockaddr_in6),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) /* NOTE: A lot of things set to zero explicitly by call to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) * sk_alloc() so need not be done here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) static int dccp_v6_init_sock(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) static __u8 dccp_v6_ctl_sock_initialized;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) if (err == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if (unlikely(!dccp_v6_ctl_sock_initialized))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) dccp_v6_ctl_sock_initialized = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) static void dccp_v6_destroy_sock(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) dccp_destroy_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) inet6_destroy_sock(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) static struct timewait_sock_ops dccp6_timewait_sock_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) static struct proto dccp_v6_prot = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) .name = "DCCPv6",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) .close = dccp_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) .connect = dccp_v6_connect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) .disconnect = dccp_disconnect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) .ioctl = dccp_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) .init = dccp_v6_init_sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) .setsockopt = dccp_setsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) .getsockopt = dccp_getsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) .sendmsg = dccp_sendmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) .recvmsg = dccp_recvmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) .backlog_rcv = dccp_v6_do_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) .hash = inet6_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) .unhash = inet_unhash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) .accept = inet_csk_accept,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) .get_port = inet_csk_get_port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) .shutdown = dccp_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) .destroy = dccp_v6_destroy_sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) .orphan_count = &dccp_orphan_count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) .max_header = MAX_DCCP_HEADER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) .obj_size = sizeof(struct dccp6_sock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) .slab_flags = SLAB_TYPESAFE_BY_RCU,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) .rsk_prot = &dccp6_request_sock_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) .twsk_prot = &dccp6_timewait_sock_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) .h.hashinfo = &dccp_hashinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) static const struct inet6_protocol dccp_v6_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) .handler = dccp_v6_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) .err_handler = dccp_v6_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) static const struct proto_ops inet6_dccp_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) .family = PF_INET6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) .release = inet6_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) .bind = inet6_bind,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) .connect = inet_stream_connect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) .socketpair = sock_no_socketpair,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) .accept = inet_accept,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) .getname = inet6_getname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) .poll = dccp_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) .ioctl = inet6_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) .gettstamp = sock_gettstamp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) .listen = inet_dccp_listen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) .shutdown = inet_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) .setsockopt = sock_common_setsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) .getsockopt = sock_common_getsockopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) .sendmsg = inet_sendmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) .recvmsg = sock_common_recvmsg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) .mmap = sock_no_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) .sendpage = sock_no_sendpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) .compat_ioctl = inet6_compat_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) static struct inet_protosw dccp_v6_protosw = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) .type = SOCK_DCCP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) .protocol = IPPROTO_DCCP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) .prot = &dccp_v6_prot,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) .ops = &inet6_dccp_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) .flags = INET_PROTOSW_ICSK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) static int __net_init dccp_v6_init_net(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) if (dccp_hashinfo.bhash == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) return -ESOCKTNOSUPPORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) SOCK_DCCP, IPPROTO_DCCP, net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) static void __net_exit dccp_v6_exit_net(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) inet_ctl_sock_destroy(net->dccp.v6_ctl_sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) inet_twsk_purge(&dccp_hashinfo, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) static struct pernet_operations dccp_v6_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) .init = dccp_v6_init_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) .exit = dccp_v6_exit_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) .exit_batch = dccp_v6_exit_batch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) static int __init dccp_v6_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) int err = proto_register(&dccp_v6_prot, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) inet6_register_protosw(&dccp_v6_protosw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) err = register_pernet_subsys(&dccp_v6_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) goto out_destroy_ctl_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) goto out_unregister_proto;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) out_unregister_proto:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) unregister_pernet_subsys(&dccp_v6_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) out_destroy_ctl_sock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) inet6_unregister_protosw(&dccp_v6_protosw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) proto_unregister(&dccp_v6_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) static void __exit dccp_v6_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) unregister_pernet_subsys(&dccp_v6_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) inet6_unregister_protosw(&dccp_v6_protosw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) proto_unregister(&dccp_v6_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) module_init(dccp_v6_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) module_exit(dccp_v6_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) * values directly, Also cover the case where the protocol is not specified,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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