From: David Miller <davem@xxxxxxxxxxxxx> Date: Tue, 08 Nov 2011 14:19:50 -0500 (EST) > I suspect that your real problem has nothing to do with UDP or RAW, > but rather the issue is that entries already in the routing cache > with a NULL peer need to be refreshed with peer information created > in another context. So you want something like this patch: diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 155138d..2966631 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1677,12 +1677,8 @@ static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer) return 0; } -static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) +static struct rtable *ipv4_validate_peer(struct rtable *rt) { - struct rtable *rt = (struct rtable *) dst; - - if (rt_is_expired(rt)) - return NULL; if (rt->rt_peer_genid != rt_peer_genid()) { struct inet_peer *peer; @@ -1691,17 +1687,27 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) peer = rt->peer; if (peer) { - check_peer_pmtu(dst, peer); + check_peer_pmtu(&rt->dst, peer); if (peer->redirect_learned.a4 && peer->redirect_learned.a4 != rt->rt_gateway) { - if (check_peer_redir(dst, peer)) + if (check_peer_redir(&rt->dst, peer)) return NULL; } } rt->rt_peer_genid = rt_peer_genid(); } + return rt; +} + +static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie) +{ + struct rtable *rt = (struct rtable *) dst; + + if (rt_is_expired(rt)) + return NULL; + dst = (struct dst_entry *) ipv4_validate_peer(rt); return dst; } @@ -2349,6 +2355,9 @@ int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr, rth->rt_mark == skb->mark && net_eq(dev_net(rth->dst.dev), net) && !rt_is_expired(rth)) { + rth = ipv4_validate_peer(rth); + if (!rth) + continue; if (noref) { dst_use_noref(&rth->dst, jiffies); skb_dst_set_noref(skb, &rth->dst); @@ -2724,6 +2733,9 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp4) (IPTOS_RT_MASK | RTO_ONLINK)) && net_eq(dev_net(rth->dst.dev), net) && !rt_is_expired(rth)) { + rth = ipv4_validate_peer(rth); + if (!rth) + continue; dst_use(&rth->dst, jiffies); RT_CACHE_STAT_INC(out_hit); rcu_read_unlock_bh(); -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html