mirror of https://gitee.com/openkylin/linux.git
ipv4: Cache learned redirect information in inetpeer.
Note that we do not generate the redirect netevent any longer, because we don't create a new cached route. Instead, once the new neighbour is bound to the cached route, we emit a neigh update event instead. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
2c8cec5c10
commit
f39925dbde
136
net/ipv4/route.c
136
net/ipv4/route.c
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@ -1294,13 +1294,8 @@ static void rt_del(unsigned hash, struct rtable *rt)
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void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
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__be32 saddr, struct net_device *dev)
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{
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int i, k;
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struct in_device *in_dev = __in_dev_get_rcu(dev);
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struct rtable *rth;
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struct rtable __rcu **rthp;
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__be32 skeys[2] = { saddr, 0 };
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int ikeys[2] = { dev->ifindex, 0 };
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struct netevent_redirect netevent;
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struct inet_peer *peer;
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struct net *net;
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if (!in_dev)
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@ -1312,9 +1307,6 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
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ipv4_is_zeronet(new_gw))
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goto reject_redirect;
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if (!rt_caching(net))
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goto reject_redirect;
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if (!IN_DEV_SHARED_MEDIA(in_dev)) {
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if (!inet_addr_onlink(in_dev, new_gw, old_gw))
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goto reject_redirect;
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@ -1325,93 +1317,13 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
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goto reject_redirect;
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}
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for (i = 0; i < 2; i++) {
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for (k = 0; k < 2; k++) {
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unsigned hash = rt_hash(daddr, skeys[i], ikeys[k],
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rt_genid(net));
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peer = inet_getpeer_v4(daddr, 1);
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if (peer) {
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peer->redirect_learned.a4 = new_gw;
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rthp = &rt_hash_table[hash].chain;
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inet_putpeer(peer);
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while ((rth = rcu_dereference(*rthp)) != NULL) {
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struct rtable *rt;
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if (rth->fl.fl4_dst != daddr ||
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rth->fl.fl4_src != skeys[i] ||
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rth->fl.oif != ikeys[k] ||
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rt_is_input_route(rth) ||
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rt_is_expired(rth) ||
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!net_eq(dev_net(rth->dst.dev), net)) {
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rthp = &rth->dst.rt_next;
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continue;
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}
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if (rth->rt_dst != daddr ||
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rth->rt_src != saddr ||
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rth->dst.error ||
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rth->rt_gateway != old_gw ||
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rth->dst.dev != dev)
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break;
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dst_hold(&rth->dst);
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rt = dst_alloc(&ipv4_dst_ops);
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if (rt == NULL) {
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ip_rt_put(rth);
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return;
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}
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/* Copy all the information. */
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*rt = *rth;
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rt->dst.__use = 1;
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atomic_set(&rt->dst.__refcnt, 1);
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rt->dst.child = NULL;
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if (rt->dst.dev)
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dev_hold(rt->dst.dev);
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rt->dst.obsolete = -1;
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rt->dst.lastuse = jiffies;
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rt->dst.path = &rt->dst;
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rt->dst.neighbour = NULL;
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rt->dst.hh = NULL;
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#ifdef CONFIG_XFRM
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rt->dst.xfrm = NULL;
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#endif
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rt->rt_genid = rt_genid(net);
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rt->rt_flags |= RTCF_REDIRECTED;
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/* Gateway is different ... */
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rt->rt_gateway = new_gw;
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/* Redirect received -> path was valid */
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dst_confirm(&rth->dst);
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if (rt->peer)
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atomic_inc(&rt->peer->refcnt);
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if (rt->fi)
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atomic_inc(&rt->fi->fib_clntref);
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if (arp_bind_neighbour(&rt->dst) ||
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!(rt->dst.neighbour->nud_state &
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NUD_VALID)) {
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if (rt->dst.neighbour)
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neigh_event_send(rt->dst.neighbour, NULL);
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ip_rt_put(rth);
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rt_drop(rt);
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goto do_next;
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}
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netevent.old = &rth->dst;
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netevent.new = &rt->dst;
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call_netevent_notifiers(NETEVENT_REDIRECT,
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&netevent);
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rt_del(hash, rth);
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if (!rt_intern_hash(hash, rt, &rt, NULL, rt->fl.oif))
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ip_rt_put(rt);
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goto do_next;
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}
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do_next:
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;
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}
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atomic_inc(&__rt_peer_genid);
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}
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return;
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@ -1678,6 +1590,31 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
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}
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}
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static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
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{
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struct rtable *rt = (struct rtable *) dst;
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__be32 orig_gw = rt->rt_gateway;
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dst_confirm(&rt->dst);
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neigh_release(rt->dst.neighbour);
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rt->dst.neighbour = NULL;
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rt->rt_gateway = peer->redirect_learned.a4;
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if (arp_bind_neighbour(&rt->dst) ||
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!(rt->dst.neighbour->nud_state & NUD_VALID)) {
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if (rt->dst.neighbour)
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neigh_event_send(rt->dst.neighbour, NULL);
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rt->rt_gateway = orig_gw;
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return -EAGAIN;
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} else {
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rt->rt_flags |= RTCF_REDIRECTED;
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call_netevent_notifiers(NETEVENT_NEIGH_UPDATE,
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rt->dst.neighbour);
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}
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return 0;
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}
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static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
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{
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struct rtable *rt = (struct rtable *) dst;
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@ -1694,6 +1631,12 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
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if (peer && peer->pmtu_expires)
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check_peer_pmtu(dst, peer);
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if (peer && peer->redirect_learned.a4 &&
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peer->redirect_learned.a4 != rt->rt_gateway) {
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if (check_peer_redir(dst, peer))
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return NULL;
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}
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rt->rt_peer_genid = rt_peer_genid();
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}
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return dst;
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@ -1830,6 +1773,11 @@ static void rt_init_metrics(struct rtable *rt, struct fib_info *fi)
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if (peer->pmtu_expires)
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check_peer_pmtu(&rt->dst, peer);
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if (peer->redirect_learned.a4 &&
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peer->redirect_learned.a4 != rt->rt_gateway) {
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rt->rt_gateway = peer->redirect_learned.a4;
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rt->rt_flags |= RTCF_REDIRECTED;
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}
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} else {
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if (fi->fib_metrics != (u32 *) dst_default_metrics) {
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rt->fi = fi;
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