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inet: add a redirect generation id in inetpeer 

Now inetpeer is the place where we cache redirect information for ipv4
destinations, we must be able to invalidate informations when a route is
added/removed on host.

As inetpeer is not yet namespace aware, this patch adds a shared
redirect_genid, and a per inetpeer redirect_genid. This might be changed
later if inetpeer becomes ns aware.

Cache information for one inerpeer is valid as long as its
redirect_genid has the same value than global redirect_genid.

Reported-by: Arkadiusz Miśkiewicz <a.miskiewicz@gmail.com>
Tested-by: Arkadiusz Miśkiewicz <a.miskiewicz@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
wifi-calibration
Eric Dumazet 2011-11-26 12:13:44 +00:00 committed by David S. Miller
parent 0884d7aa24
commit de68dca181
2 changed files with 10 additions and 1 deletions
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1
include/net/inetpeer.h
View File

@ -35,6 +35,7 @@ struct inet_peer {
u32 metrics[RTAX_MAX];
u32 rate_tokens; /* rate limiting for ICMP */
int redirect_genid;
unsigned long rate_last;
unsigned long pmtu_expires;
u32 pmtu_orig;

10
net/ipv4/route.c
View File

@ -131,6 +131,7 @@ static int ip_rt_mtu_expires __read_mostly = 10 * 60 * HZ;
static int ip_rt_min_pmtu __read_mostly = 512 + 20 + 20;
static int ip_rt_min_advmss __read_mostly = 256;
static int rt_chain_length_max __read_mostly = 20;
static int redirect_genid;
/*
* Interface to generic destination cache.
@ -837,6 +838,7 @@ static void rt_cache_invalidate(struct net *net)
get_random_bytes(&shuffle, sizeof(shuffle));
atomic_add(shuffle + 1U, &net->ipv4.rt_genid);
redirect_genid++;
}
/*
@ -1391,8 +1393,10 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
peer = rt->peer;
if (peer) {
if (peer->redirect_learned.a4 != new_gw) {
if (peer->redirect_learned.a4 != new_gw ||
peer->redirect_genid != redirect_genid) {
peer->redirect_learned.a4 = new_gw;
peer->redirect_genid = redirect_genid;
atomic_inc(&__rt_peer_genid);
}
check_peer_redir(&rt->dst, peer);
@ -1701,6 +1705,8 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
if (peer) {
check_peer_pmtu(dst, peer);
if (peer->redirect_genid != redirect_genid)
peer->redirect_learned.a4 = 0;
if (peer->redirect_learned.a4 &&
peer->redirect_learned.a4 != rt->rt_gateway) {
if (check_peer_redir(dst, peer))
@ -1857,6 +1863,8 @@ static void rt_init_metrics(struct rtable *rt, const struct flowi4 *fl4,
dst_init_metrics(&rt->dst, peer->metrics, false);
check_peer_pmtu(&rt->dst, peer);
if (peer->redirect_genid != redirect_genid)
peer->redirect_learned.a4 = 0;
if (peer->redirect_learned.a4 &&
peer->redirect_learned.a4 != rt->rt_gateway) {
rt->rt_gateway = peer->redirect_learned.a4;