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authorVladimir Ratnikov <vratnikov@netgate.com>2019-12-20 04:55:50 -0500
committerOle Trøan <otroan@employees.org>2020-01-03 10:11:05 +0000
commit87663cdf644fb7c94c0fec9460829b7e4e7c35ca (patch)
tree035e274a906c7d1b6b2ef7b2b51661ed4242d240
parentf126e746fc01c75bc99329d10ce9127b26b23814 (diff)
map: fix ip4-map-t DF behavior
ip4_is_fragment(header) or ip4_is_first_fragment(header) didn't changed when packet with fragmentation needed arrives. This patch checks DF flag and MTU with packet length and if DF is set and length > MTU, packet is dropped. In case if ignore_df is set, DF flag makes no sense. Type: fix Fixes: d6d50cebde647f9a5ee7251a7fef977506f315d7 Signed-off-by: Vladimir Ratnikov <vratnikov@netgate.com> Change-Id: I720e25167c19a0b13ac5fdfb41b12c0bbdc00d09
-rw-r--r--src/plugins/map/ip4_map_t.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/src/plugins/map/ip4_map_t.c b/src/plugins/map/ip4_map_t.c
index a02b55478c2..dca32846480 100644
--- a/src/plugins/map/ip4_map_t.c
+++ b/src/plugins/map/ip4_map_t.c
@@ -575,6 +575,18 @@ ip4_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
goto exit;
}
+ bool df0 =
+ ip40->flags_and_fragment_offset &
+ clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
+
+ if (PREDICT_FALSE
+ (df0 && !map_main.frag_ignore_df && (ip4_len0 > d0->mtu)))
+ {
+ p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
+ next0 = IP4_MAPT_NEXT_DROP;
+ goto exit;
+ }
+
vnet_buffer (p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0;
dst_port0 = -1;
@@ -601,17 +613,6 @@ ip4_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
pheader0->daddr.as_u64[1] =
map_get_sfx_net (d0, ip40->dst_address.as_u32, (u16) dst_port0);
- bool df0 =
- ip40->flags_and_fragment_offset &
- clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
-
- if (PREDICT_TRUE (ip4_is_first_fragment (ip40) && df0))
- {
- p0->error = error_node->errors[MAP_ERROR_FRAGMENT_DROPPED];
- next0 = IP4_MAPT_NEXT_MAPT_FRAGMENTED;
- goto exit;
- }
-
if (PREDICT_TRUE
(error0 == MAP_ERROR_NONE && next0 != IP4_MAPT_NEXT_MAPT_ICMP))
{