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| author | Eric Dumazet <edumazet@google.com> | 2019-10-01 10:49:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-10-01 13:07:53 -0700 |
| commit | be2644aac3e1db02d09f45d56206bbdafca582a2 (patch) | |
| tree | 36976d22af2d893c45cfb0e06cf651fcb5cc8028 | |
| parent | 5be5515a8ea198de6eb204a0ff25faf98b8ff719 (diff) | |
| download | lwn-be2644aac3e1db02d09f45d56206bbdafca582a2.tar.gz lwn-be2644aac3e1db02d09f45d56206bbdafca582a2.zip | |
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>
| -rw-r--r-- | include/net/ipv6.h | 5 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 6 |
2 files changed, 7 insertions, 4 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 009605c56f20..d04b7abe2a4c 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -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) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 2ee45e3755e9..27dc3c1e9094 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -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 |