diff options
| author |   Andreas Schultz <andreas.schultz@travelping.com> | 2018-07-17 11:43:23 +0200 |
|---|---|---|
| committer |   Florin Coras <florin.coras@gmail.com> | 2018-07-19 14:02:19 +0000 |
| commit | e73b6b7bacb635814b6e47c63e49c60cc5a13bf1 (patch) | |
| tree | c2a85ff75139388532591a1a85d0e899006dc51a /src | |
| parent | 43f02bb8a77337e2f56016529c9e46c8b8dc455a (diff) | |
Fix IPv6 csum calculation in GTP-U encapsulation
The length field is included in the checksum. Therefor, we need
to update it before calculating the checksum.
Change-Id: Id23234efb80ea3747a0f8a5c7bf8621748d27635
Signed-off-by: Andreas Schultz <andreas.schultz@travelping.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/plugins/gtpu/gtpu_encap.c | 49 |
1 files changed, 25 insertions, 24 deletions
diff --git a/src/plugins/gtpu/gtpu_encap.c b/src/plugins/gtpu/gtpu_encap.c index 4442c42ad66..5f52d5a1543 100644 --- a/src/plugins/gtpu/gtpu_encap.c +++ b/src/plugins/gtpu/gtpu_encap.c @@ -380,24 +380,6 @@ gtpu_encap_inline (vlib_main_t * vm, udp3->length = new_l3; udp3->src_port = flow_hash3; - /* IPv6 UDP checksum is mandatory */ - udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, - ip6_0, &bogus); - if (udp0->checksum == 0) - udp0->checksum = 0xffff; - udp1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b1, - ip6_1, &bogus); - if (udp1->checksum == 0) - udp1->checksum = 0xffff; - udp2->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b2, - ip6_2, &bogus); - if (udp2->checksum == 0) - udp2->checksum = 0xffff; - udp3->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b3, - ip6_3, &bogus); - if (udp3->checksum == 0) - udp3->checksum = 0xffff; - /* Fix GTPU length */ gtpu0 = (gtpu_header_t *)(udp0+1); new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0) @@ -419,6 +401,25 @@ gtpu_encap_inline (vlib_main_t * vm, - sizeof (*ip6_3) - sizeof(*udp3) - GTPU_V1_HDR_LEN); gtpu3->length = new_l3; + + /* IPv6 UDP checksum is mandatory */ + udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, + ip6_0, &bogus); + if (udp0->checksum == 0) + udp0->checksum = 0xffff; + udp1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b1, + ip6_1, &bogus); + if (udp1->checksum == 0) + udp1->checksum = 0xffff; + udp2->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b2, + ip6_2, &bogus); + if (udp2->checksum == 0) + udp2->checksum = 0xffff; + udp3->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b3, + ip6_3, &bogus); + if (udp3->checksum == 0) + udp3->checksum = 0xffff; + } pkts_encapsulated += 4; @@ -592,18 +593,18 @@ gtpu_encap_inline (vlib_main_t * vm, udp0->length = new_l0; udp0->src_port = flow_hash0; - /* IPv6 UDP checksum is mandatory */ - udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, - ip6_0, &bogus); - if (udp0->checksum == 0) - udp0->checksum = 0xffff; - /* Fix GTPU length */ gtpu0 = (gtpu_header_t *)(udp0+1); new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0) - sizeof (*ip4_0) - sizeof(*udp0) - GTPU_V1_HDR_LEN); gtpu0->length = new_l0; + + /* IPv6 UDP checksum is mandatory */ + udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, + ip6_0, &bogus); + if (udp0->checksum == 0) + udp0->checksum = 0xffff; } pkts_encapsulated ++; |