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authorFlorin Coras <fcoras@cisco.com>2021-03-05 13:30:18 -0800
committerDave Barach <openvpp@barachs.net>2021-03-08 15:26:28 +0000
commit7a588fc7819153fe32e7d12733da4ecd2e663437 (patch)
treec9ab7718b76ae054307ca0bc26986948cc61cd05 /src
parente3416e307e263dc565546c4e748df99b584708a0 (diff)
tcp: account for option alignment in initial snd_mss
Type: fix Signed-off-by: Florin Coras <fcoras@cisco.com> Change-Id: I24225ada6623c5b5543341ecac0d6c1db43cc8a9
Diffstat (limited to 'src')
-rw-r--r--src/vnet/tcp/tcp.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 407ba9576a8..161b8ef25a2 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -657,9 +657,10 @@ tcp_init_mss (tcp_connection_t * tc)
/* We should have enough space for 40 bytes of options */
ASSERT (tc->snd_mss > 45);
- /* If we use timestamp option, account for it */
+ /* If we use timestamp option, account for it and make sure
+ * the options are 4-byte aligned */
if (tcp_opts_tstamp (&tc->rcv_opts))
- tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP;
+ tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP + 2 /* alignment */;
}
/**