From: Jakub Sitnicki Date: Sun, 26 Jul 2020 12:02:28 +0000 (+0200) Subject: udp, bpf: Ignore connections in reuseport group after BPF sk lookup X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c64c9c282a9a7ec0515b725d5aaed68c32e403a4;p=linux.git udp, bpf: Ignore connections in reuseport group after BPF sk lookup When BPF sk lookup invokes reuseport handling for the selected socket, it should ignore the fact that reuseport group can contain connected UDP sockets. With BPF sk lookup this is not relevant as we are not scoring sockets to find the best match, which might be a connected UDP socket. Fix it by unconditionally accepting the socket selected by reuseport. This fixes the following two failures reported by test_progs. # ./test_progs -t sk_lookup ... #73/14 UDP IPv4 redir and reuseport with conns:FAIL ... #73/20 UDP IPv6 redir and reuseport with conns:FAIL ... Fixes: a57066b1a019 ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net") Reported-by: Alexei Starovoitov Signed-off-by: Jakub Sitnicki Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20200726120228.1414348-1-jakub@cloudflare.com --- diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 7ce31beccfc2d..e88efba07551a 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -473,7 +473,7 @@ static struct sock *udp4_lookup_run_bpf(struct net *net, return sk; reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum); - if (reuse_sk && !reuseport_has_conns(sk, false)) + if (reuse_sk) sk = reuse_sk; return sk; } diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index c394e674f4860..29d9691359b9c 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -208,7 +208,7 @@ static inline struct sock *udp6_lookup_run_bpf(struct net *net, return sk; reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum); - if (reuse_sk && !reuseport_has_conns(sk, false)) + if (reuse_sk) sk = reuse_sk; return sk; }