diff options
| author |   Jon Loeliger <jdl@netgate.com> | 2019-11-14 16:44:40 -0600 |
|---|---|---|
| committer |   Ole Trøan <otroan@employees.org> | 2019-11-19 03:41:46 +0000 |
| commit | b15ad95124ca97dd9a800394b93f1fe19567d2e1 (patch) | |
| tree | fa59c275143f0efbf531cb6240e979cefff0e436 /src/plugins/map/ip4_map.c | |
| parent | 93e060aee441e98adf44a72149679a838d7084f3 (diff) | |
map: Fix TCP MSS clamping for MAP-E traffic.
Original MSS clamp patch by Vladimir Ratnikov.
Modified to apply only to TCP packets.
Type: fix
Test: Wrote new unit test to ensure MAP-E TCP MSS clamping.
Change-Id: I77c69714a2e3cc3b7473aa12b645243bb595c2a2
Signed-off-by: Vladimir Ratnikov <vratnikov@netgate.com>
Signed-off-by: Jon Loeliger <jdl@netgate.com>
Diffstat (limited to 'src/plugins/map/ip4_map.c')
| -rw-r--r-- | src/plugins/map/ip4_map.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/plugins/map/ip4_map.c b/src/plugins/map/ip4_map.c index f2a00907a57..68c3d73094c 100644 --- a/src/plugins/map/ip4_map.c +++ b/src/plugins/map/ip4_map.c @@ -209,6 +209,20 @@ ip4_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) */ port0 = ip4_map_port_and_security_check (d0, p0, &error0); + /* + * Clamp TCP MSS value. + */ + if (ip40->protocol == IP_PROTOCOL_TCP) + { + tcp_header_t *tcp = ip4_next_header (ip40); + if (mm->tcp_mss > 0 && tcp_syn (tcp)) + { + ip_csum_t csum = tcp->checksum; + map_mss_clamping (tcp, &csum, mm->tcp_mss); + tcp->checksum = ip_csum_fold (csum); + } + } + /* Decrement IPv4 TTL */ ip4_map_decrement_ttl (ip40, &error0); bool df0 = |