ip: Fragmentation fixes
Type: fix
if the packet is about to be fragmented, then don't call any of the
actions that expect the rewrite to have been written.
1) don't double count packets thru the adjacency (original & fragments)
2) don't double decrement the TTL for fragments
3) return to ip4-midchain post ip-frag if that's where we started.
4) only run midchain/mcast fixups if not fragmenting (if no errors)
Change-Id: Ib2866787a42713ee5871b87b597d8f74b901044b
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/ip/ip_frag.c b/src/vnet/ip/ip_frag.c
index 230722c..54efb63 100644
--- a/src/vnet/ip/ip_frag.c
+++ b/src/vnet/ip/ip_frag.c
@@ -200,6 +200,17 @@
clib_memcpy_fast (to_b->data, org_from_packet, sizeof (ip4_header_t));
to_ip4 = vlib_buffer_get_current (to_b);
to_data = (void *) (to_ip4 + 1);
+ vnet_buffer (to_b)->l3_hdr_offset = to_b->current_data;
+ to_b->flags |= VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
+
+ if (from_b->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID)
+ {
+ vnet_buffer (to_b)->l4_hdr_offset =
+ (vnet_buffer (to_b)->l3_hdr_offset +
+ (vnet_buffer (from_b)->l4_hdr_offset -
+ vnet_buffer (from_b)->l3_hdr_offset));
+ to_b->flags |= VNET_BUFFER_F_L4_HDR_OFFSET_VALID;
+ }
/* Spin through from buffers filling up the to buffer */
u16 left_in_to_buffer = len, to_ptr = 0;
@@ -232,6 +243,7 @@
}
to_b->current_length = len + sizeof (ip4_header_t);
+ to_b->flags |= VNET_BUFFER_F_IS_IP4;
to_ip4->fragment_id = ip_frag_id;
to_ip4->flags_and_fragment_offset =
@@ -241,6 +253,9 @@
to_ip4->length = clib_host_to_net_u16 (len + sizeof (ip4_header_t));
to_ip4->checksum = ip4_header_checksum (to_ip4);
+ /* we've just done the IP checksum .. */
+ to_b->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
+
if (vnet_buffer (org_from_b)->ip_frag.flags & IP_FRAG_FLAG_IP4_HEADER)
{
/* Encapsulating ipv4 header */
@@ -482,6 +497,19 @@
to_frag_hdr = (ip6_frag_hdr_t *) (to_ip6 + 1);
to_data = (void *) (to_frag_hdr + 1);
+ vnet_buffer (to_b)->l3_hdr_offset = to_b->current_data;
+ to_b->flags |= VNET_BUFFER_F_L3_HDR_OFFSET_VALID;
+
+ if (from_b->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID)
+ {
+ vnet_buffer (to_b)->l4_hdr_offset =
+ (vnet_buffer (to_b)->l3_hdr_offset +
+ (vnet_buffer (from_b)->l4_hdr_offset -
+ vnet_buffer (from_b)->l3_hdr_offset));
+ to_b->flags |= VNET_BUFFER_F_L4_HDR_OFFSET_VALID;
+ }
+ to_b->flags |= VNET_BUFFER_F_IS_IP6;
+
/* Spin through from buffers filling up the to buffer */
u16 left_in_to_buffer = len, to_ptr = 0;
while (1)
@@ -551,6 +579,7 @@
.n_next_nodes = IP4_FRAG_N_NEXT,
.next_nodes = {
[IP4_FRAG_NEXT_IP4_REWRITE] = "ip4-rewrite",
+ [IP4_FRAG_NEXT_IP4_REWRITE_MIDCHAIN] = "ip4-midchain",
[IP4_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
[IP4_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
[IP4_FRAG_NEXT_MPLS_OUTPUT] = "mpls-output",
@@ -574,6 +603,7 @@
.n_next_nodes = IP6_FRAG_N_NEXT,
.next_nodes = {
[IP6_FRAG_NEXT_IP6_REWRITE] = "ip6-rewrite",
+ [IP6_FRAG_NEXT_IP6_REWRITE_MIDCHAIN] = "ip6-midchain",
[IP6_FRAG_NEXT_IP4_LOOKUP] = "ip4-lookup",
[IP6_FRAG_NEXT_IP6_LOOKUP] = "ip6-lookup",
[IP6_FRAG_NEXT_MPLS_OUTPUT] = "mpls-output",