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tcp: fix build error if IPv6 is not enabled 

$ make M=net/ipv4
  CC      net/ipv4/route.o
In file included from net/ipv4/route.c:102:0:
include/net/tcp.h: In function ‘tcp_v6_iif’:
include/net/tcp.h:738:32: error: ‘union <anonymous>’ has no member named ‘h6’
  return TCP_SKB_CB(skb)->header.h6.iif;

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 870c315138 ("ipv6: introduce tcp_v6_iif()")
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-10-18 08:34:37 -07:00 committed by David S. Miller
parent f2d9da1a83
commit 815afe1785
1 changed files with 2 additions and 0 deletions
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2
include/net/tcp.h
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@ -730,6 +730,7 @@ struct tcp_skb_cb {
#define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0])) #define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0]))
#if IS_ENABLED(CONFIG_IPV6)
/* This is the variant of inet6_iif() that must be used by TCP, /* This is the variant of inet6_iif() that must be used by TCP,
* as TCP moves IP6CB into a different location in skb->cb[] * as TCP moves IP6CB into a different location in skb->cb[]
*/ */
@ -737,6 +738,7 @@ static inline int tcp_v6_iif(const struct sk_buff *skb)
{ {
return TCP_SKB_CB(skb)->header.h6.iif; return TCP_SKB_CB(skb)->header.h6.iif;
} }
#endif
/* Due to TSO, an SKB can be composed of multiple actual /* Due to TSO, an SKB can be composed of multiple actual
* packets. To keep these tracked properly, we use this. * packets. To keep these tracked properly, we use this.