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xfrm4: Invalidate all ipv4 routes on IPsec pmtu events 

On IPsec pmtu events we can't access the transport headers of
the original packet, so we can't find the socket that sent
the packet. The only chance to notify the socket about the
pmtu change is to force a relookup for all routes. This
patch implenents this for the IPsec protocols.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2013-01-15 13:38:53 +01:00
parent 5b653b2a1c
commit 05ab86c556
3 changed files with 15 additions and 6 deletions
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7
net/ipv4/ah4.c
View File

@ -420,9 +420,12 @@ static void ah4_err(struct sk_buff *skb, u32 info)
if (!x)
return;
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) {
atomic_inc(&flow_cache_genid);
rt_genid_bump(net);
ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_AH, 0);
else
} else
ipv4_redirect(skb, net, 0, 0, IPPROTO_AH, 0);
xfrm_state_put(x);
}

7
net/ipv4/esp4.c
View File

@ -502,9 +502,12 @@ static void esp4_err(struct sk_buff *skb, u32 info)
if (!x)
return;
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) {
atomic_inc(&flow_cache_genid);
rt_genid_bump(net);
ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_ESP, 0);
else
} else
ipv4_redirect(skb, net, 0, 0, IPPROTO_ESP, 0);
xfrm_state_put(x);
}

7
net/ipv4/ipcomp.c
View File

@ -47,9 +47,12 @@ static void ipcomp4_err(struct sk_buff *skb, u32 info)
if (!x)
return;
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) {
atomic_inc(&flow_cache_genid);
rt_genid_bump(net);
ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_COMP, 0);
else
} else
ipv4_redirect(skb, net, 0, 0, IPPROTO_COMP, 0);
xfrm_state_put(x);
}