From 5e07e672412bed473122813ab35d4f7d42fd9635 Mon Sep 17 00:00:00 2001 From: Kuniyuki Iwashima Date: Tue, 19 Dec 2023 09:18:22 +0900 Subject: tcp: Use bhash2 for v4-mapped-v6 non-wildcard address. While checking port availability in bind() or listen(), we used only bhash for all v4-mapped-v6 addresses. But there is no good reason not to use bhash2 for v4-mapped-v6 non-wildcard addresses. Let's do it by returning true in inet_use_bhash2_on_bind(). Then, we also need to add a test in inet_bind2_bucket_match_addr_any() so that ::ffff:X.X.X.X will match with 0.0.0.0. Note that sk->sk_rcv_saddr is initialised for v4-mapped-v6 sk in __inet6_bind(). Signed-off-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/inet_connection_sock.c | 7 +++++-- net/ipv4/inet_hashtables.c | 3 ++- 2 files changed, 7 insertions(+), 3 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c index bd325b029dd1..d48255875f60 100644 --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -159,8 +159,11 @@ static bool inet_use_bhash2_on_bind(const struct sock *sk) if (sk->sk_family == AF_INET6) { int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr); - return addr_type != IPV6_ADDR_ANY && - addr_type != IPV6_ADDR_MAPPED; + if (addr_type == IPV6_ADDR_ANY) + return false; + + if (addr_type != IPV6_ADDR_MAPPED) + return true; } #endif return sk->sk_rcv_saddr != htonl(INADDR_ANY); diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 9ff201bc4e6d..7e8dbc5cc317 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -841,7 +841,8 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const return ipv6_addr_any(&tb->v6_rcv_saddr) || ipv6_addr_v4mapped_any(&tb->v6_rcv_saddr); - return false; + return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) && + tb->rcv_saddr == 0; } if (sk->sk_family == AF_INET6) -- cgit