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inet: ip_skb_dst_mtu() should use sk_fullsock() 

SYN_RECV & TIMEWAIT sockets are not full blown,
do not even try to call ip_sk_use_pmtu() on them.

Fixes: ca6fb06518 ("tcp: attach SYNACK messages to request sockets instead of listener")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-04 21:08:08 -07:00 committed by David S. Miller
parent 7656d842de
commit caf3f2676a
1 changed files with 6 additions and 3 deletions
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9
include/net/ip.h
View File

@ -323,12 +323,15 @@ static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb) static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
{ {
if (!skb->sk || ip_sk_use_pmtu(skb->sk)) { struct sock *sk = skb->sk;
if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
} else {
return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
} }
return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
} }
u32 ip_idents_reserve(u32 hash, int segs); u32 ip_idents_reserve(u32 hash, int segs);