Commit f2b2c55e authored by Kuniyuki Iwashima's avatar Kuniyuki Iwashima Committed by David S. Miller

udp: Copy has_conns in reuseport_grow().

If an unconnected socket in a UDP reuseport group connect()s, has_conns is
set to 1. Then, when a packet is received, udp[46]_lib_lookup2() scans all
sockets in udp_hslot looking for the connected socket with the highest
score.

However, when the number of sockets bound to the port exceeds max_socks,
reuseport_grow() resets has_conns to 0. It can cause udp[46]_lib_lookup2()
to return without scanning all sockets, resulting in that packets sent to
connected sockets may be distributed to unconnected sockets.

Therefore, reuseport_grow() should copy has_conns.

Fixes: acdcecc6 ("udp: correct reuseport selection with connected sockets")
CC: Willem de Bruijn <willemb@google.com>
Reviewed-by: default avatarBenjamin Herrenschmidt <benh@amazon.com>
Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.co.jp>
Acked-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6ef9dcb7
...@@ -101,6 +101,7 @@ static struct sock_reuseport *reuseport_grow(struct sock_reuseport *reuse) ...@@ -101,6 +101,7 @@ static struct sock_reuseport *reuseport_grow(struct sock_reuseport *reuse)
more_reuse->prog = reuse->prog; more_reuse->prog = reuse->prog;
more_reuse->reuseport_id = reuse->reuseport_id; more_reuse->reuseport_id = reuse->reuseport_id;
more_reuse->bind_inany = reuse->bind_inany; more_reuse->bind_inany = reuse->bind_inany;
more_reuse->has_conns = reuse->has_conns;
memcpy(more_reuse->socks, reuse->socks, memcpy(more_reuse->socks, reuse->socks,
reuse->num_socks * sizeof(struct sock *)); reuse->num_socks * sizeof(struct sock *));
......
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