^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) * DECnet An implementation of the DECnet protocol suite for the LINUX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * operating system. DECnet is implemented using the BSD Socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * interface as the means of communication with the user level.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * DECnet Routing Functions (Endnode and Router)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Authors: Steve Whitehouse <SteveW@ACM.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Eduardo Marcelo Serrat <emserrat@geocities.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Changes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Steve Whitehouse : Fixes to allow "intra-ethernet" and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * "return-to-sender" bits on outgoing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * packets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Steve Whitehouse : Timeouts for cached routes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Steve Whitehouse : Use dst cache for input routes too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Steve Whitehouse : Fixed error values in dn_send_skb.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Steve Whitehouse : Rework routing functions to better fit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * DECnet routing design
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Alexey Kuznetsov : New SMP locking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Steve Whitehouse : More SMP locking changes & dn_cache_dump()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Steve Whitehouse : Prerouting NF hook, now really is prerouting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Fixed possible skb leak in rtnetlink funcs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Steve Whitehouse : Dave Miller's dynamic hash table sizing and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Alexey Kuznetsov's finer grained locking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * from ipv4/route.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Steve Whitehouse : Routing is now starting to look like a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * sensible set of code now, mainly due to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * my copying the IPv4 routing code. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * hooks here are modified and will continue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * to evolve for a while.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Steve Whitehouse : Real SMP at last :-) Also new netfilter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * stuff. Look out raw sockets your days
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * are numbered!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Steve Whitehouse : Added return-to-sender functions. Added
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * backlog congestion level return codes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * Steve Whitehouse : Fixed bug where routes were set up with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * no ref count on net devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Steve Whitehouse : RCU for the route cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * Steve Whitehouse : Preparations for the flow cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * Steve Whitehouse : Prepare for nonlinear skbs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) (c) 1995-1998 E.M. Serrat emserrat@geocities.com
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #include <linux/route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #include <linux/in_route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #include <linux/netfilter_decnet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #include <linux/times.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #include <asm/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #include <net/net_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #include <net/netlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #include <net/neighbour.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #include <net/dst.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #include <net/flow.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #include <net/fib_rules.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #include <net/dn.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #include <net/dn_dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #include <net/dn_nsp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #include <net/dn_route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #include <net/dn_neigh.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #include <net/dn_fib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct dn_rt_hash_bucket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct dn_route __rcu *chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) extern struct neigh_table dn_neigh_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static const int dn_rt_min_delay = 2 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static const int dn_rt_max_delay = 10 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static const int dn_rt_mtu_expires = 10 * 60 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static unsigned long dn_rt_deadline;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static int dn_dst_gc(struct dst_ops *ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static unsigned int dn_dst_default_advmss(const struct dst_entry *dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static unsigned int dn_dst_mtu(const struct dst_entry *dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static void dn_dst_destroy(struct dst_entry *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static void dn_dst_ifdown(struct dst_entry *, struct net_device *dev, int how);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static void dn_dst_link_failure(struct sk_buff *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct sk_buff *skb , u32 mtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) bool confirm_neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) const void *daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static int dn_route_input(struct sk_buff *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static void dn_run_flush(struct timer_list *unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static struct dn_rt_hash_bucket *dn_rt_hash_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static unsigned int dn_rt_hash_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static struct timer_list dn_route_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static DEFINE_TIMER(dn_rt_flush_timer, dn_run_flush);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int decnet_dst_gc_interval = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static struct dst_ops dn_dst_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) .family = PF_DECnet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) .gc_thresh = 128,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) .gc = dn_dst_gc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .check = dn_dst_check,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .default_advmss = dn_dst_default_advmss,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .mtu = dn_dst_mtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .cow_metrics = dst_cow_metrics_generic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .destroy = dn_dst_destroy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .ifdown = dn_dst_ifdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .negative_advice = dn_dst_negative_advice,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .link_failure = dn_dst_link_failure,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .update_pmtu = dn_dst_update_pmtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .redirect = dn_dst_redirect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) .neigh_lookup = dn_dst_neigh_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static void dn_dst_destroy(struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct dn_route *rt = (struct dn_route *) dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (rt->n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) neigh_release(rt->n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dst_destroy_metrics_generic(dst);
^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 void dn_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (how) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct dn_route *rt = (struct dn_route *) dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct neighbour *n = rt->n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (n && n->dev == dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) n->dev = dev_net(dev)->loopback_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) dev_hold(n->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) dev_put(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) static __inline__ unsigned int dn_hash(__le16 src, __le16 dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) __u16 tmp = (__u16 __force)(src ^ dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) tmp ^= (tmp >> 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) tmp ^= (tmp >> 5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) tmp ^= (tmp >> 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return dn_rt_hash_mask & (unsigned int)tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static void dn_dst_check_expire(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct dn_route *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct dn_route __rcu **rtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) unsigned long now = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) unsigned long expire = 120 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) for (i = 0; i <= dn_rt_hash_mask; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) rtp = &dn_rt_hash_table[i].chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) spin_lock(&dn_rt_hash_table[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) while ((rt = rcu_dereference_protected(*rtp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (atomic_read(&rt->dst.__refcnt) > 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) (now - rt->dst.lastuse) < expire) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) rtp = &rt->dn_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) *rtp = rt->dn_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) rt->dn_next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) dst_dev_put(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) dst_release(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) spin_unlock(&dn_rt_hash_table[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if ((jiffies - now) > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) break;
^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) mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static int dn_dst_gc(struct dst_ops *ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct dn_route *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) struct dn_route __rcu **rtp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) unsigned long now = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) unsigned long expire = 10 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) for (i = 0; i <= dn_rt_hash_mask; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) spin_lock_bh(&dn_rt_hash_table[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) rtp = &dn_rt_hash_table[i].chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) while ((rt = rcu_dereference_protected(*rtp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (atomic_read(&rt->dst.__refcnt) > 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) (now - rt->dst.lastuse) < expire) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) rtp = &rt->dn_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) *rtp = rt->dn_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) rt->dn_next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) dst_dev_put(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) dst_release(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) spin_unlock_bh(&dn_rt_hash_table[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return 0;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * The decnet standards don't impose a particular minimum mtu, what they
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * do insist on is that the routing layer accepts a datagram of at least
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * 230 bytes long. Here we have to subtract the routing header length from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * assume the worst and use a long header size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * We update both the mtu and the advertised mss (i.e. the segment size we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * advertise to the other end).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static void dn_dst_update_pmtu(struct dst_entry *dst, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) struct sk_buff *skb, u32 mtu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) bool confirm_neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct dn_route *rt = (struct dn_route *) dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) struct neighbour *n = rt->n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) u32 min_mtu = 230;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct dn_dev *dn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) dn = n ? rcu_dereference_raw(n->dev->dn_ptr) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (dn && dn->use_long == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) min_mtu -= 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) min_mtu -= 21;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) if (dst_metric(dst, RTAX_MTU) > mtu && mtu >= min_mtu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (!(dst_metric_locked(dst, RTAX_MTU))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) dst_metric_set(dst, RTAX_MTU, mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) dst_set_expires(dst, dn_rt_mtu_expires);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) u32 existing_mss = dst_metric_raw(dst, RTAX_ADVMSS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (!existing_mss || existing_mss > mss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) dst_metric_set(dst, RTAX_ADVMSS, mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static void dn_dst_redirect(struct dst_entry *dst, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * When a route has been marked obsolete. (e.g. routing cache flush)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return NULL;
^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 dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) dst_release(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static void dn_dst_link_failure(struct sk_buff *skb)
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static inline int compare_keys(struct flowidn *fl1, struct flowidn *fl2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return ((fl1->daddr ^ fl2->daddr) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) (fl1->saddr ^ fl2->saddr) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) (fl1->flowidn_mark ^ fl2->flowidn_mark) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) (fl1->flowidn_scope ^ fl2->flowidn_scope) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) (fl1->flowidn_oif ^ fl2->flowidn_oif) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) (fl1->flowidn_iif ^ fl2->flowidn_iif)) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static int dn_insert_route(struct dn_route *rt, unsigned int hash, struct dn_route **rp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) struct dn_route *rth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct dn_route __rcu **rthp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) unsigned long now = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) rthp = &dn_rt_hash_table[hash].chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) spin_lock_bh(&dn_rt_hash_table[hash].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) while ((rth = rcu_dereference_protected(*rthp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (compare_keys(&rth->fld, &rt->fld)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /* Put it first */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) *rthp = rth->dn_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) rcu_assign_pointer(rth->dn_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) dn_rt_hash_table[hash].chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) dst_hold_and_use(&rth->dst, now);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) spin_unlock_bh(&dn_rt_hash_table[hash].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) dst_release_immediate(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) *rp = rth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) rthp = &rth->dn_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) rcu_assign_pointer(rt->dn_next, dn_rt_hash_table[hash].chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) dst_hold_and_use(&rt->dst, now);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) spin_unlock_bh(&dn_rt_hash_table[hash].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) *rp = rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) static void dn_run_flush(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) struct dn_route *rt, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) for (i = 0; i < dn_rt_hash_mask; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) spin_lock_bh(&dn_rt_hash_table[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) goto nothing_to_declare;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) for(; rt; rt = next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) next = rcu_dereference_raw(rt->dn_next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) RCU_INIT_POINTER(rt->dn_next, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) dst_dev_put(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) dst_release(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) nothing_to_declare:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) spin_unlock_bh(&dn_rt_hash_table[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) static DEFINE_SPINLOCK(dn_rt_flush_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) void dn_rt_cache_flush(int delay)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) unsigned long now = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) int user_mode = !in_interrupt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (delay < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) delay = dn_rt_min_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) spin_lock_bh(&dn_rt_flush_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) long tmo = (long)(dn_rt_deadline - now);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) tmo = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) if (delay > tmo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) delay = tmo;
^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) if (delay <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) spin_unlock_bh(&dn_rt_flush_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) dn_run_flush(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (dn_rt_deadline == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) dn_rt_deadline = now + dn_rt_max_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) dn_rt_flush_timer.expires = now + delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) add_timer(&dn_rt_flush_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) spin_unlock_bh(&dn_rt_flush_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * dn_return_short - Return a short packet to its sender
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * @skb: The packet to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) static int dn_return_short(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) struct dn_skb_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) unsigned char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) __le16 *src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) __le16 *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) /* Add back headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) skb_push(skb, skb->data - skb_network_header(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) /* Skip packet length and point to flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) ptr = skb->data + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) dst = (__le16 *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) ptr += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) src = (__le16 *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) ptr += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) *ptr = 0; /* Zero hop count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) swap(*src, *dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) skb->pkt_type = PACKET_OUTGOING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) dn_rt_finish_output(skb, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^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) * dn_return_long - Return a long packet to its sender
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * @skb: The long format packet to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) static int dn_return_long(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) struct dn_skb_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) unsigned char *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) unsigned char *src_addr, *dst_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) unsigned char tmp[ETH_ALEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) /* Add back all headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) skb_push(skb, skb->data - skb_network_header(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) /* Ignore packet length and point to flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) ptr = skb->data + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) /* Skip padding */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (*ptr & DN_RT_F_PF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) char padlen = (*ptr & ~DN_RT_F_PF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) ptr += padlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) ptr += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) dst_addr = ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) ptr += 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) src_addr = ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) ptr += 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) *ptr = 0; /* Zero hop count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) /* Swap source and destination */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) memcpy(tmp, src_addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) memcpy(src_addr, dst_addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) memcpy(dst_addr, tmp, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) skb->pkt_type = PACKET_OUTGOING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) dn_rt_finish_output(skb, dst_addr, src_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * dn_route_rx_packet - Try and find a route for an incoming packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * @net: The applicable net namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * @sk: Socket packet transmitted on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * @skb: The packet to find a route for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * Returns: result of input function if route is found, error code otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) static int dn_route_rx_packet(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) struct dn_skb_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if ((err = dn_route_input(skb)) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) return dst_input(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (decnet_debug_level & 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) char *devname = skb->dev ? skb->dev->name : "???";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) printk(KERN_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) (int)cb->rt_flags, devname, skb->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) le16_to_cpu(cb->src), le16_to_cpu(cb->dst),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) err, skb->pkt_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) switch (cb->rt_flags & DN_RT_PKT_MSK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) case DN_RT_PKT_SHORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) return dn_return_short(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) case DN_RT_PKT_LONG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) return dn_return_long(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) static int dn_route_rx_long(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) unsigned char *ptr = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto drop_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) skb_pull(skb, 20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) /* Destination info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ptr += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) cb->dst = dn_eth2dn(ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) if (memcmp(ptr, dn_hiord_addr, 4) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) goto drop_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) ptr += 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) /* Source info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) ptr += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) cb->src = dn_eth2dn(ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) if (memcmp(ptr, dn_hiord_addr, 4) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) goto drop_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) ptr += 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) /* Other junk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) ptr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) cb->hops = *ptr++; /* Visit Count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) &init_net, NULL, skb, skb->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) dn_route_rx_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) drop_it:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) static int dn_route_rx_short(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) unsigned char *ptr = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) goto drop_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) skb_pull(skb, 5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) cb->dst = *(__le16 *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) ptr += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) cb->src = *(__le16 *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) ptr += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) cb->hops = *ptr & 0x3f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) return NF_HOOK(NFPROTO_DECNET, NF_DN_PRE_ROUTING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) &init_net, NULL, skb, skb->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) dn_route_rx_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) drop_it:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) static int dn_route_discard(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) * I know we drop the packet here, but thats considered success in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) * this case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) return NET_RX_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) static int dn_route_ptp_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) dn_dev_hello(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) dn_neigh_pointopoint_hello(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return NET_RX_SUCCESS;
^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) int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) struct dn_skb_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) unsigned char flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) __u16 len = le16_to_cpu(*(__le16 *)skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) struct dn_dev *dn = rcu_dereference(dev->dn_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) unsigned char padlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) if (!net_eq(dev_net(dev), &init_net))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) if (dn == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) if (!pskb_may_pull(skb, 3))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) skb_pull(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (len > skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) skb_trim(skb, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) flags = *skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) cb->stamp = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) cb->iif = dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) * If we have padding, remove it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if (flags & DN_RT_F_PF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) padlen = flags & ~DN_RT_F_PF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) if (!pskb_may_pull(skb, padlen + 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) skb_pull(skb, padlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) flags = *skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) skb_reset_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) * Weed out future version DECnet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) if (flags & DN_RT_F_VER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) cb->rt_flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) if (decnet_debug_level & 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) printk(KERN_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) (int)flags, dev->name, len, skb->len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) padlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (flags & DN_RT_PKT_CNTL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (unlikely(skb_linearize(skb)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) switch (flags & DN_RT_CNTL_MSK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) case DN_RT_PKT_INIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) dn_dev_init_pkt(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) case DN_RT_PKT_VERI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) dn_dev_veri_pkt(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (dn->parms.state != DN_DEV_S_RU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) switch (flags & DN_RT_CNTL_MSK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) case DN_RT_PKT_HELO:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) &init_net, NULL, skb, skb->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) dn_route_ptp_hello);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) case DN_RT_PKT_L1RT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) case DN_RT_PKT_L2RT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) return NF_HOOK(NFPROTO_DECNET, NF_DN_ROUTE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) &init_net, NULL, skb, skb->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) dn_route_discard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) case DN_RT_PKT_ERTH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) &init_net, NULL, skb, skb->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) dn_neigh_router_hello);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) case DN_RT_PKT_EEDH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) return NF_HOOK(NFPROTO_DECNET, NF_DN_HELLO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) &init_net, NULL, skb, skb->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) dn_neigh_endnode_hello);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) if (dn->parms.state != DN_DEV_S_RU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) goto dump_it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) skb_pull(skb, 1); /* Pull flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) switch (flags & DN_RT_PKT_MSK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) case DN_RT_PKT_LONG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) return dn_route_rx_long(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) case DN_RT_PKT_SHORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) return dn_route_rx_short(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) dump_it:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) static int dn_output(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) struct dst_entry *dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) struct dn_route *rt = (struct dn_route *)dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) struct net_device *dev = dst->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) int err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) if (rt->n == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) cb->src = rt->rt_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) cb->dst = rt->rt_daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) * Always set the Intra-Ethernet bit on all outgoing packets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * originated on this node. Only valid flag from upper layers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) * is return-to-sender-requested. Set hop count to 0 too.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) cb->rt_flags &= ~DN_RT_F_RQR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) cb->rt_flags |= DN_RT_F_IE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) cb->hops = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) &init_net, sk, skb, NULL, dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) dn_to_neigh_output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) net_dbg_ratelimited("dn_output: This should not happen\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) static int dn_forward(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) struct dst_entry *dst = skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) struct dn_route *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) int header_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) struct net_device *dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) if (skb->pkt_type != PACKET_HOST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) /* Ensure that we have enough space for headers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) rt = (struct dn_route *)skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) header_len = dn_db->use_long ? 21 : 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) if (skb_cow(skb, LL_RESERVED_SPACE(rt->dst.dev)+header_len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) * Hop count exceeded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) if (++cb->hops > 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) skb->dev = rt->dst.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) * If packet goes out same interface it came in on, then set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) * the Intra-Ethernet bit. This has no effect for short
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * packets, so we don't need to test for them here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) cb->rt_flags &= ~DN_RT_F_IE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) if (rt->rt_flags & RTCF_DOREDIRECT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) cb->rt_flags |= DN_RT_F_IE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) return NF_HOOK(NFPROTO_DECNET, NF_DN_FORWARD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) &init_net, NULL, skb, dev, skb->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) dn_to_neigh_output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) * Used to catch bugs. This should never normally get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) * called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) static int dn_rt_bug_out(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) static int dn_rt_bug(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) net_dbg_ratelimited("dn_rt_bug: skb from:%04x to:%04x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) le16_to_cpu(cb->src), le16_to_cpu(cb->dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) return NET_RX_DROP;
^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) static unsigned int dn_dst_default_advmss(const struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) return dn_mss_from_pmtu(dst->dev, dst_mtu(dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) static unsigned int dn_dst_mtu(const struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) return mtu ? : dst->dev->mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) const void *daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) struct dn_fib_info *fi = res->fi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) struct net_device *dev = rt->dst.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) unsigned int mss_metric;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) struct neighbour *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) if (fi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (DN_FIB_RES_GW(*res) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) rt->rt_gateway = DN_FIB_RES_GW(*res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) dst_init_metrics(&rt->dst, fi->fib_metrics, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) rt->rt_type = res->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) if (dev != NULL && rt->n == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) if (IS_ERR(n))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) return PTR_ERR(n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) rt->n = n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) if (dst_metric(&rt->dst, RTAX_MTU) > rt->dst.dev->mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) dst_metric_set(&rt->dst, RTAX_MTU, rt->dst.dev->mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) mss_metric = dst_metric_raw(&rt->dst, RTAX_ADVMSS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) if (mss_metric) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) unsigned int mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) if (mss_metric > mss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) dst_metric_set(&rt->dst, RTAX_ADVMSS, mss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) static inline int dn_match_addr(__le16 addr1, __le16 addr2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) __u16 tmp = le16_to_cpu(addr1) ^ le16_to_cpu(addr2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) int match = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) while(tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) tmp >>= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) match--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) return match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) __le16 saddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) struct dn_dev *dn_db;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) struct dn_ifaddr *ifa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) int best_match = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) dn_db = rcu_dereference(dev->dn_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) for (ifa = rcu_dereference(dn_db->ifa_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) ifa != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) ifa = rcu_dereference(ifa->ifa_next)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) if (ifa->ifa_scope > scope)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) if (!daddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) saddr = ifa->ifa_local;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) ret = dn_match_addr(daddr, ifa->ifa_local);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) if (ret > best_match)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) saddr = ifa->ifa_local;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) if (best_match == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) saddr = ifa->ifa_local;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) return saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) static inline __le16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) static inline __le16 dn_fib_rules_map_destination(__le16 daddr, struct dn_fib_res *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) __le16 mask = dnet_make_mask(res->prefixlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) return (daddr&~mask)|res->fi->fib_nh->nh_gw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *oldflp, int try_hard)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) struct flowidn fld = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) .daddr = oldflp->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) .saddr = oldflp->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) .flowidn_scope = RT_SCOPE_UNIVERSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) .flowidn_mark = oldflp->flowidn_mark,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) .flowidn_iif = LOOPBACK_IFINDEX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) .flowidn_oif = oldflp->flowidn_oif,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) struct dn_route *rt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) struct net_device *dev_out = NULL, *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) struct neighbour *neigh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) unsigned int hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) unsigned int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) int free_res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) __le16 gateway = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) if (decnet_debug_level & 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) printk(KERN_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) "dn_route_output_slow: dst=%04x src=%04x mark=%d"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) le16_to_cpu(oldflp->saddr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) oldflp->flowidn_mark, LOOPBACK_IFINDEX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) oldflp->flowidn_oif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) /* If we have an output interface, verify its a DECnet device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) if (oldflp->flowidn_oif) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) dev_out = dev_get_by_index(&init_net, oldflp->flowidn_oif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) if (dev_out && dev_out->dn_ptr == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) dev_out = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) if (dev_out == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) /* If we have a source address, verify that its a local address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) if (oldflp->saddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) err = -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) if (dev_out) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) if (dn_dev_islocal(dev_out, oldflp->saddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) goto source_ok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) for_each_netdev_rcu(&init_net, dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) if (!dev->dn_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) if (!dn_dev_islocal(dev, oldflp->saddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if ((dev->flags & IFF_LOOPBACK) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) oldflp->daddr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) !dn_dev_islocal(dev, oldflp->daddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) dev_out = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) if (dev_out == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) dev_hold(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) source_ok:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) /* No destination? Assume its local */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) if (!fld.daddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) fld.daddr = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) if (dev_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) dev_out = init_net.loopback_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) if (!dev_out->dn_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) err = -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) dev_hold(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) if (!fld.daddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) fld.daddr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) fld.saddr = dnet_select_source(dev_out, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) RT_SCOPE_HOST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) if (!fld.daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) fld.flowidn_oif = LOOPBACK_IFINDEX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) res.type = RTN_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) goto make_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) if (decnet_debug_level & 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) printk(KERN_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) "dn_route_output_slow: initial checks complete."
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) " dst=%04x src=%04x oif=%d try_hard=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) le16_to_cpu(fld.daddr), le16_to_cpu(fld.saddr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) fld.flowidn_oif, try_hard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) * N.B. If the kernel is compiled without router support then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) * dn_fib_lookup() will evaluate to non-zero so this if () block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) * will always be executed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) err = -ESRCH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) if (try_hard || (err = dn_fib_lookup(&fld, &res)) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) struct dn_dev *dn_db;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) if (err != -ESRCH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) * Here the fallback is basically the standard algorithm for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) * routing in endnodes which is described in the DECnet routing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) * docs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) * If we are not trying hard, look in neighbour cache.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) * The result is tested to ensure that if a specific output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) * device/source address was requested, then we honour that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) * here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) if (!try_hard) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) neigh = neigh_lookup_nodev(&dn_neigh_table, &init_net, &fld.daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) if (neigh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) if ((oldflp->flowidn_oif &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) (neigh->dev->ifindex != oldflp->flowidn_oif)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) (oldflp->saddr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) (!dn_dev_islocal(neigh->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) oldflp->saddr)))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) neigh_release(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) neigh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) if (dev_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) if (dn_dev_islocal(neigh->dev, fld.daddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) dev_out = init_net.loopback_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) res.type = RTN_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) dev_out = neigh->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) dev_hold(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) goto select_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) /* Not there? Perhaps its a local address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) if (dev_out == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) dev_out = dn_dev_get_default();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) err = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) if (dev_out == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) dn_db = rcu_dereference_raw(dev_out->dn_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) if (!dn_db)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) /* Possible improvement - check all devices for local addr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) if (dn_dev_islocal(dev_out, fld.daddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) dev_out = init_net.loopback_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) dev_hold(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) res.type = RTN_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) goto select_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) /* Not local either.... try sending it to the default router */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) neigh = neigh_clone(dn_db->router);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) BUG_ON(neigh && neigh->dev != dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) /* Ok then, we assume its directly connected and move on */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) select_source:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) if (neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) gateway = ((struct dn_neigh *)neigh)->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) if (gateway == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) gateway = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) if (fld.saddr == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) fld.saddr = dnet_select_source(dev_out, gateway,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) res.type == RTN_LOCAL ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) RT_SCOPE_HOST :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) RT_SCOPE_LINK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) if (fld.saddr == 0 && res.type != RTN_LOCAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) goto e_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) fld.flowidn_oif = dev_out->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) goto make_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) free_res = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) if (res.type == RTN_NAT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) if (res.type == RTN_LOCAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) if (!fld.saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) fld.saddr = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) if (dev_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) dev_out = init_net.loopback_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) dev_hold(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) if (!dev_out->dn_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) fld.flowidn_oif = dev_out->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) if (res.fi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) dn_fib_info_put(res.fi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) res.fi = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) goto make_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) dn_fib_select_multipath(&fld, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) * We could add some logic to deal with default routes here and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) * get rid of some of the special casing above.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) if (!fld.saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) fld.saddr = DN_FIB_RES_PREFSRC(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) if (dev_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) dev_out = DN_FIB_RES_DEV(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) dev_hold(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) fld.flowidn_oif = dev_out->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) gateway = DN_FIB_RES_GW(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) make_route:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) if (dev_out->flags & IFF_LOOPBACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) flags |= RTCF_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) rt = dst_alloc(&dn_dst_ops, dev_out, 0, DST_OBSOLETE_NONE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) if (rt == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) goto e_nobufs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) rt->dn_next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) memset(&rt->fld, 0, sizeof(rt->fld));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) rt->fld.saddr = oldflp->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) rt->fld.daddr = oldflp->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) rt->fld.flowidn_oif = oldflp->flowidn_oif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) rt->fld.flowidn_iif = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) rt->fld.flowidn_mark = oldflp->flowidn_mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) rt->rt_saddr = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) rt->rt_daddr = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) rt->rt_gateway = gateway ? gateway : fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) rt->rt_local_src = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) rt->rt_dst_map = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) rt->rt_src_map = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) rt->n = neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) neigh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) rt->dst.lastuse = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) rt->dst.output = dn_output;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) rt->dst.input = dn_rt_bug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) rt->rt_flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) if (flags & RTCF_LOCAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) rt->dst.input = dn_nsp_rx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) err = dn_rt_set_next_hop(rt, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) goto e_neighbour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) /* dn_insert_route() increments dst->__refcnt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) dn_insert_route(rt, hash, (struct dn_route **)pprt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) if (neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) neigh_release(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) if (free_res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) dn_fib_res_put(&res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) if (dev_out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) dev_put(dev_out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) e_addr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) err = -EADDRNOTAVAIL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) e_inval:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) e_nobufs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) err = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) e_neighbour:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) dst_release_immediate(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) goto e_nobufs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) * N.B. The flags may be moved into the flowi at some future stage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) static int __dn_route_output_key(struct dst_entry **pprt, const struct flowidn *flp, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) unsigned int hash = dn_hash(flp->saddr, flp->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) struct dn_route *rt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) if (!(flags & MSG_TRYHARD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) for (rt = rcu_dereference_bh(dn_rt_hash_table[hash].chain); rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) rt = rcu_dereference_bh(rt->dn_next)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) if ((flp->daddr == rt->fld.daddr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) (flp->saddr == rt->fld.saddr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) (flp->flowidn_mark == rt->fld.flowidn_mark) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) dn_is_output_route(rt) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) (rt->fld.flowidn_oif == flp->flowidn_oif)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) dst_hold_and_use(&rt->dst, jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) *pprt = &rt->dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) return dn_route_output_slow(pprt, flp, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) static int dn_route_output_key(struct dst_entry **pprt, struct flowidn *flp, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) err = __dn_route_output_key(pprt, flp, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) if (err == 0 && flp->flowidn_proto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) *pprt = xfrm_lookup(&init_net, *pprt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) flowidn_to_flowi(flp), NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) if (IS_ERR(*pprt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) err = PTR_ERR(*pprt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) *pprt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) return err;
^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) int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *fl, struct sock *sk, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) if (err == 0 && fl->flowidn_proto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) *pprt = xfrm_lookup(&init_net, *pprt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) flowidn_to_flowi(fl), sk, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) if (IS_ERR(*pprt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) err = PTR_ERR(*pprt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) *pprt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) static int dn_route_input_slow(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) struct dn_route *rt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) struct net_device *in_dev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) struct net_device *out_dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) struct dn_dev *dn_db;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) struct neighbour *neigh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) unsigned int hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) int flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) __le16 gateway = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) __le16 local_src = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) struct flowidn fld = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) .daddr = cb->dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) .saddr = cb->src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) .flowidn_scope = RT_SCOPE_UNIVERSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) .flowidn_mark = skb->mark,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) .flowidn_iif = skb->dev->ifindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) int err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) int free_res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) dev_hold(in_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) /* Zero source addresses are not allowed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) if (fld.saddr == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) * In this case we've just received a packet from a source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) * outside ourselves pretending to come from us. We don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) * allow it any further to prevent routing loops, spoofing and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) * other nasties. Loopback packets already have the dst attached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) * so this only affects packets which have originated elsewhere.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) err = -ENOTUNIQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) if (dn_dev_islocal(in_dev, cb->src))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) err = dn_fib_lookup(&fld, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) if (err != -ESRCH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) * Is the destination us ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) if (!dn_dev_islocal(in_dev, cb->dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) res.type = RTN_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) __le16 src_map = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) free_res = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) out_dev = DN_FIB_RES_DEV(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) if (out_dev == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) net_crit_ratelimited("Bug in dn_route_input_slow() No output device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) dev_hold(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) if (res.r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) src_map = fld.saddr; /* no NAT support for now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) gateway = DN_FIB_RES_GW(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) if (res.type == RTN_NAT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) fld.daddr = dn_fib_rules_map_destination(fld.daddr, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) dn_fib_res_put(&res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) free_res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) if (dn_fib_lookup(&fld, &res))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) free_res = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) if (res.type != RTN_UNICAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) flags |= RTCF_DNAT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) gateway = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) fld.saddr = src_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) switch(res.type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) case RTN_UNICAST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) * Forwarding check here, we only check for forwarding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) * being turned off, if you want to only forward intra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) * area, its up to you to set the routing tables up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) * correctly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) if (dn_db->parms.forwarding == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) if (res.fi->fib_nhs > 1 && fld.flowidn_oif == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) dn_fib_select_multipath(&fld, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) * flag as a hint to set the intra-ethernet bit when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) * forwarding. If we've got NAT in operation, we don't do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) * this optimisation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) if (out_dev == in_dev && !(flags & RTCF_NAT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) flags |= RTCF_DOREDIRECT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) local_src = DN_FIB_RES_PREFSRC(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) case RTN_BLACKHOLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) case RTN_UNREACHABLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) case RTN_LOCAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) flags |= RTCF_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) fld.saddr = cb->dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) fld.daddr = cb->src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) /* Routing tables gave us a gateway */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) if (gateway)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) goto make_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) /* Packet was intra-ethernet, so we know its on-link */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) if (cb->rt_flags & DN_RT_F_IE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) gateway = cb->src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) goto make_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) /* Use the default router if there is one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) neigh = neigh_clone(dn_db->router);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) if (neigh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) gateway = ((struct dn_neigh *)neigh)->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) goto make_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) /* Close eyes and pray */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) gateway = cb->src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) goto make_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) goto e_inval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) make_route:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) rt = dst_alloc(&dn_dst_ops, out_dev, 1, DST_OBSOLETE_NONE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) if (rt == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) goto e_nobufs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) rt->dn_next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) memset(&rt->fld, 0, sizeof(rt->fld));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) rt->rt_saddr = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) rt->rt_daddr = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) rt->rt_gateway = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) if (gateway)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) rt->rt_gateway = gateway;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) rt->rt_dst_map = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) rt->rt_src_map = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) rt->fld.saddr = cb->src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) rt->fld.daddr = cb->dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) rt->fld.flowidn_oif = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) rt->fld.flowidn_iif = in_dev->ifindex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) rt->fld.flowidn_mark = fld.flowidn_mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) rt->n = neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) rt->dst.lastuse = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) rt->dst.output = dn_rt_bug_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) switch (res.type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) case RTN_UNICAST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) rt->dst.input = dn_forward;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) case RTN_LOCAL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) rt->dst.output = dn_output;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) rt->dst.input = dn_nsp_rx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) rt->dst.dev = in_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) flags |= RTCF_LOCAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) case RTN_UNREACHABLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) case RTN_BLACKHOLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) rt->dst.input = dst_discard;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) rt->rt_flags = flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) err = dn_rt_set_next_hop(rt, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) goto e_neighbour;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) hash = dn_hash(rt->fld.saddr, rt->fld.daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) /* dn_insert_route() increments dst->__refcnt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) dn_insert_route(rt, hash, &rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) skb_dst_set(skb, &rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) if (neigh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) neigh_release(neigh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) if (free_res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) dn_fib_res_put(&res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) dev_put(in_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) if (out_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) dev_put(out_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) e_inval:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) e_nobufs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) err = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) e_neighbour:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) dst_release_immediate(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) static int dn_route_input(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) struct dn_route *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) struct dn_skb_cb *cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) unsigned int hash = dn_hash(cb->src, cb->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) if (skb_dst(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) rt = rcu_dereference(rt->dn_next)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) if ((rt->fld.saddr == cb->src) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) (rt->fld.daddr == cb->dst) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) (rt->fld.flowidn_oif == 0) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) (rt->fld.flowidn_mark == skb->mark) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) (rt->fld.flowidn_iif == cb->iif)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) dst_hold_and_use(&rt->dst, jiffies);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) skb_dst_set(skb, (struct dst_entry *)rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) return dn_route_input_slow(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) static int dn_rt_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) int event, int nowait, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) struct dn_route *rt = (struct dn_route *)skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) struct rtmsg *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) struct nlmsghdr *nlh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) long expires;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) nlh = nlmsg_put(skb, portid, seq, event, sizeof(*r), flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) if (!nlh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) r = nlmsg_data(nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) r->rtm_family = AF_DECnet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) r->rtm_dst_len = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) r->rtm_src_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) r->rtm_tos = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) r->rtm_table = RT_TABLE_MAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) r->rtm_type = rt->rt_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) r->rtm_scope = RT_SCOPE_UNIVERSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) r->rtm_protocol = RTPROT_UNSPEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) if (rt->rt_flags & RTCF_NOTIFY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) r->rtm_flags |= RTM_F_NOTIFY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) if (nla_put_u32(skb, RTA_TABLE, RT_TABLE_MAIN) < 0 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) nla_put_le16(skb, RTA_DST, rt->rt_daddr) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) if (rt->fld.saddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) r->rtm_src_len = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) if (nla_put_le16(skb, RTA_SRC, rt->fld.saddr) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) if (rt->dst.dev &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) * Note to self - change this if input routes reverse direction when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) * they deal only with inputs and not with replies like they do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) * currently.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) if (nla_put_le16(skb, RTA_PREFSRC, rt->rt_local_src) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) if (rt->rt_daddr != rt->rt_gateway &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) nla_put_le16(skb, RTA_GATEWAY, rt->rt_gateway) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) expires = rt->dst.expires ? rt->dst.expires - jiffies : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) rt->dst.error) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) if (dn_is_input_route(rt) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) nla_put_u32(skb, RTA_IIF, rt->fld.flowidn_iif) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) nlmsg_end(skb, nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) errout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) nlmsg_cancel(skb, nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) return -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) const struct nla_policy rtm_dn_policy[RTA_MAX + 1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) [RTA_DST] = { .type = NLA_U16 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) [RTA_SRC] = { .type = NLA_U16 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) [RTA_IIF] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) [RTA_OIF] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) [RTA_GATEWAY] = { .type = NLA_U16 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) [RTA_PRIORITY] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) [RTA_PREFSRC] = { .type = NLA_U16 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) [RTA_METRICS] = { .type = NLA_NESTED },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) [RTA_MULTIPATH] = { .type = NLA_NESTED },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) [RTA_TABLE] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) [RTA_MARK] = { .type = NLA_U32 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) * This is called by both endnodes and routers now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) struct net *net = sock_net(in_skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) struct rtmsg *rtm = nlmsg_data(nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) struct dn_route *rt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) struct dn_skb_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) struct flowidn fld;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) struct nlattr *tb[RTA_MAX+1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) if (!net_eq(net, &init_net))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) rtm_dn_policy, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) memset(&fld, 0, sizeof(fld));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656) fld.flowidn_proto = DNPROTO_NSP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) if (skb == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) skb_reset_mac_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) cb = DN_SKB_CB(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) if (tb[RTA_SRC])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) fld.saddr = nla_get_le16(tb[RTA_SRC]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) if (tb[RTA_DST])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) fld.daddr = nla_get_le16(tb[RTA_DST]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) if (tb[RTA_IIF])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) fld.flowidn_iif = nla_get_u32(tb[RTA_IIF]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) if (fld.flowidn_iif) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) struct net_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) dev = __dev_get_by_index(&init_net, fld.flowidn_iif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) if (!dev || !dev->dn_ptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) skb->protocol = htons(ETH_P_DNA_RT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) skb->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) cb->src = fld.saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) cb->dst = fld.daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) local_bh_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) err = dn_route_input(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) local_bh_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) memset(cb, 0, sizeof(struct dn_skb_cb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) rt = (struct dn_route *)skb_dst(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) if (!err && -rt->dst.error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) err = rt->dst.error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) if (tb[RTA_OIF])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) fld.flowidn_oif = nla_get_u32(tb[RTA_OIF]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) skb->dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) skb_dst_set(skb, &rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) if (rtm->rtm_flags & RTM_F_NOTIFY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) rt->rt_flags |= RTCF_NOTIFY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, RTM_NEWROUTE, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) err = -EMSGSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) return rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).portid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) * For routers, this is called from dn_fib_dump, but for endnodes its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) * called directly from the rtnetlink dispatch table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) struct net *net = sock_net(skb->sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) struct dn_route *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) int h, s_h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) int idx, s_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) struct rtmsg *rtm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) if (!net_eq(net, &init_net))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) if (nlmsg_len(cb->nlh) < sizeof(struct rtmsg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) rtm = nlmsg_data(cb->nlh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) if (!(rtm->rtm_flags & RTM_F_CLONED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740) s_h = cb->args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) s_idx = idx = cb->args[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) for(h = 0; h <= dn_rt_hash_mask; h++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) if (h < s_h)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) if (h > s_h)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) s_idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) for(rt = rcu_dereference_bh(dn_rt_hash_table[h].chain), idx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) rt = rcu_dereference_bh(rt->dn_next), idx++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) if (idx < s_idx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753) skb_dst_set(skb, dst_clone(&rt->dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).portid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) cb->nlh->nlmsg_seq, RTM_NEWROUTE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) 1, NLM_F_MULTI) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) skb_dst_drop(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) skb_dst_drop(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) cb->args[0] = h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) cb->args[1] = idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) return skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) #ifdef CONFIG_PROC_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) struct dn_rt_cache_iter_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) int bucket;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) struct dn_route *rt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) struct dn_rt_cache_iter_state *s = seq->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) if (rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) return rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) struct dn_rt_cache_iter_state *s = seq->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) rt = rcu_dereference_bh(rt->dn_next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) while (!rt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) if (--s->bucket < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) return rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) struct dn_route *rt = dn_rt_cache_get_first(seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) if (rt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) --*pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) return *pos ? NULL : rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) struct dn_route *rt = dn_rt_cache_get_next(seq, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) ++*pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) return rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) if (v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) struct dn_route *rt = v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) rt->dst.dev ? rt->dst.dev->name : "*",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) dn_addr2asc(le16_to_cpu(rt->rt_daddr), buf1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) dn_addr2asc(le16_to_cpu(rt->rt_saddr), buf2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) atomic_read(&rt->dst.__refcnt),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) rt->dst.__use, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) static const struct seq_operations dn_rt_cache_seq_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) .start = dn_rt_cache_seq_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) .next = dn_rt_cache_seq_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) .stop = dn_rt_cache_seq_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) .show = dn_rt_cache_seq_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) #endif /* CONFIG_PROC_FS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) void __init dn_route_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) int i, goal, order;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857) dn_dst_ops.kmem_cachep =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) kmem_cache_create("dn_dst_cache", sizeof(struct dn_route), 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) dst_entries_init(&dn_dst_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) timer_setup(&dn_route_timer, dn_dst_check_expire, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) add_timer(&dn_route_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) goal = totalram_pages() >> (26 - PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) for(order = 0; (1UL << order) < goal; order++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) /* NOTHING */;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) * Only want 1024 entries max, since the table is very, very unlikely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) * to be larger than that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) while(order && ((((1UL << order) * PAGE_SIZE) /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875) sizeof(struct dn_rt_hash_bucket)) >= 2048))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) order--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) sizeof(struct dn_rt_hash_bucket);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) dn_rt_hash_mask--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) dn_rt_hash_table = (struct dn_rt_hash_bucket *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) __get_free_pages(GFP_ATOMIC, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) } while (dn_rt_hash_table == NULL && --order > 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) if (!dn_rt_hash_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) panic("Failed to allocate DECnet route cache hash table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) printk(KERN_INFO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) dn_rt_hash_mask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893) (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) dn_rt_hash_mask--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) for(i = 0; i <= dn_rt_hash_mask; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) spin_lock_init(&dn_rt_hash_table[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) dn_rt_hash_table[i].chain = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) proc_create_seq_private("decnet_cache", 0444, init_net.proc_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) &dn_rt_cache_seq_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) sizeof(struct dn_rt_cache_iter_state), NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907) #ifdef CONFIG_DECNET_ROUTER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) dn_cache_getroute, dn_fib_dump, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETROUTE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912) dn_cache_getroute, dn_cache_dump, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) void __exit dn_route_cleanup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) del_timer(&dn_route_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) dn_run_flush(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) remove_proc_entry("decnet_cache", init_net.proc_net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) dst_entries_destroy(&dn_dst_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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