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tcp: add ipv6_addr_v4mapped_loopback() helper 

tcp_twsk_unique() has a hard coded assumption about ipv4 loopback
being 127/8

Lets instead use the standard ipv4_is_loopback() method,
in a new ipv6_addr_v4mapped_loopback() helper.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2019-10-01 10:49:06 -07:00 committed by David S. Miller
parent 5be5515a8e
commit be2644aac3
2 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/ipv6.h
View File

@ -696,6 +696,11 @@ static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
cpu_to_be32(0x0000ffff))) == 0UL;
}
static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
{
return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
}
static inline u32 ipv6_portaddr_hash(const struct net *net,
const struct in6_addr *addr6,
unsigned int port)

6
net/ipv4/tcp_ipv4.c
View File

@ -121,11 +121,9 @@ int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
#if IS_ENABLED(CONFIG_IPV6)
if (tw->tw_family == AF_INET6) {
if (ipv6_addr_loopback(&tw->tw_v6_daddr) ||
(ipv6_addr_v4mapped(&tw->tw_v6_daddr) &&
(tw->tw_v6_daddr.s6_addr[12] == 127)) ||
ipv6_addr_v4mapped_loopback(&tw->tw_v6_daddr) ||
ipv6_addr_loopback(&tw->tw_v6_rcv_saddr) ||
(ipv6_addr_v4mapped(&tw->tw_v6_rcv_saddr) &&
(tw->tw_v6_rcv_saddr.s6_addr[12] == 127)))
ipv6_addr_v4mapped_loopback(&tw->tw_v6_rcv_saddr))
loopback = true;
} else
#endif