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| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2016-06-30 16:11:18 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-07-01 16:45:18 -0400 |
| commit | 11bb62f7c05240a933dd2e6b3bf3871d99464524 (patch) | |
| tree | b5eba2ec540563f39e3932d070f3acbc79b92e20 | |
| parent | 8315011ad67670691545ed394968435f0a0bb29e (diff) | |
| download | linux-11bb62f7c05240a933dd2e6b3bf3871d99464524.tar.gz linux-11bb62f7c05240a933dd2e6b3bf3871d99464524.tar.bz2 linux-11bb62f7c05240a933dd2e6b3bf3871d99464524.zip | |
RDS: Do not send a pong to an incoming ping with 0 src port
RDS ping messages are sent with a non-zero src port to a zero
dst port, so that the rds pong messages can be sent back to the
originators src port. However if a confused/malicious sender
sends a ping with a 0 src port, we'd have an infinite ping-pong
loop. To avoid this, the receiver should ignore ping messages
with a 0 src port.
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/rds/recv.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/rds/recv.c b/net/rds/recv.c index b58f50571782..fed53a6c2890 100644 --- a/net/rds/recv.c +++ b/net/rds/recv.c @@ -226,6 +226,10 @@ void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, cp->cp_next_rx_seq = be64_to_cpu(inc->i_hdr.h_sequence) + 1; if (rds_sysctl_ping_enable && inc->i_hdr.h_dport == 0) { + if (inc->i_hdr.h_sport == 0) { + rdsdebug("ignore ping with 0 sport from 0x%x\n", saddr); + goto out; + } rds_stats_inc(s_recv_ping); rds_send_pong(cp, inc->i_hdr.h_sport); goto out; |