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ipv6: Support new TSO without HBH #1329

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f9f27bf
tests: Add coverage for GSO/TSO and BIG TCP
gentoo-root Oct 6, 2025
05831fa
ipv6: Support new BIG TCP without HBH
gentoo-root Jun 10, 2025
c6173d8
tests: Add coverage for new BIG TCP cases
gentoo-root Oct 6, 2025
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19 changes: 14 additions & 5 deletions print-ip6.c
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Expand Up @@ -466,14 +466,23 @@ ip6_print(netdissect_options *ndo, const u_char *bp, u_int length)

/*
* OK, we didn't see any extension
* header, but that means we have
* no payload, so set the length
* to the IPv6 header length,
* header - presume BIG TCP without
* a Jumbo Payload option, but only
* if it's actually >64k. Otherwise,
* we have no payload, so set the
* length to the IPv6 header length,
* and change the snapshot length
* accordingly.
*/
len = sizeof(struct ip6_hdr);
nd_change_snaplen(ndo, bp, len);
if (length > 65535) {
len = length;
if (ndo->ndo_vflag)
ND_PRINT("[real length %u, presumed BIG TCP] ",
len);
} else {
len = sizeof(struct ip6_hdr);
nd_change_snaplen(ndo, bp, len);
}

/*
* Now subtract the length of
Expand Down
24 changes: 24 additions & 0 deletions tests/TESTLIST
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Expand Up @@ -1053,3 +1053,27 @@ LINKTYPE_IPV6_invalid-e LINKTYPE_IPV6_invalid.pcap LINKTYPE_IPV6_invalid-e.out -
# ipv6_mobility_1.pcap is built with scapy
ipv6_mobility_1 ipv6_mobility_1.pcap ipv6_mobility_1.out
ipv6_mobility_1-v ipv6_mobility_1.pcap ipv6_mobility_1-v.out -v

# Aggregation offloads (GSO, BIG TCP)
gso-ipv4 gso-ipv4.pcap gso-ipv4.out -v
gso-ipv4-geneve-ipv4 gso-ipv4-geneve-ipv4.pcap gso-ipv4-geneve-ipv4.out -v
gso-ipv4-geneve-ipv6 gso-ipv4-geneve-ipv6.pcap gso-ipv4-geneve-ipv6.out -v
gso-ipv4-vxlan-ipv4 gso-ipv4-vxlan-ipv4.pcap gso-ipv4-vxlan-ipv4.out -v
gso-ipv4-vxlan-ipv6 gso-ipv4-vxlan-ipv6.pcap gso-ipv4-vxlan-ipv6.out -v
gso-ipv6 gso-ipv6.pcap gso-ipv6.out -v
gso-ipv6-geneve-ipv4 gso-ipv6-geneve-ipv4.pcap gso-ipv6-geneve-ipv4.out -v
gso-ipv6-geneve-ipv6 gso-ipv6-geneve-ipv6.pcap gso-ipv6-geneve-ipv6.out -v
gso-ipv6-vxlan-ipv4 gso-ipv6-vxlan-ipv4.pcap gso-ipv6-vxlan-ipv4.out -v
gso-ipv6-vxlan-ipv6 gso-ipv6-vxlan-ipv6.pcap gso-ipv6-vxlan-ipv6.out -v
bigtcp-ipv4 bigtcp-ipv4.pcap bigtcp-ipv4.out -v
bigtcp-ipv4-geneve-ipv4 bigtcp-ipv4-geneve-ipv4.pcap bigtcp-ipv4-geneve-ipv4.out -v
bigtcp-ipv4-geneve-ipv6 bigtcp-ipv4-geneve-ipv6.pcap bigtcp-ipv4-geneve-ipv6.out -v
bigtcp-ipv4-vxlan-ipv4 bigtcp-ipv4-vxlan-ipv4.pcap bigtcp-ipv4-vxlan-ipv4.out -v
bigtcp-ipv4-vxlan-ipv6 bigtcp-ipv4-vxlan-ipv6.pcap bigtcp-ipv4-vxlan-ipv6.out -v
bigtcp-ipv6 bigtcp-ipv6.pcap bigtcp-ipv6.out -v
bigtcp-ipv6-hbh bigtcp-ipv6-hbh.pcap bigtcp-ipv6-hbh.out -v
bigtcp-ipv6-geneve-ipv4 bigtcp-ipv6-geneve-ipv4.pcap bigtcp-ipv6-geneve-ipv4.out -v
bigtcp-ipv6-geneve-ipv6 bigtcp-ipv6-geneve-ipv6.pcap bigtcp-ipv6-geneve-ipv6.out -v
bigtcp-ipv6-vxlan-ipv4 bigtcp-ipv6-vxlan-ipv4.pcap bigtcp-ipv6-vxlan-ipv4.out -v
bigtcp-ipv6-vxlan-ipv6 bigtcp-ipv6-vxlan-ipv6.pcap bigtcp-ipv6-vxlan-ipv6.out -v
icmp-length-zero icmp-length-zero.pcap icmp-length-zero.out -v
4 changes: 4 additions & 0 deletions tests/bigtcp-ipv4-geneve-ipv4.out
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@@ -0,0 +1,4 @@
1 2025-10-03 14:04:08.505389 IP (tos 0x0, ttl 61, id 44946, offset 0, flags [none], proto UDP (17), length 80102 [was 0, presumed TSO])
10.25.132.11.29804 > 10.25.132.13.6081: Geneve, Flags [none], vni 0x1389
IP (tos 0x0, ttl 64, id 3511, offset 0, flags [DF], proto TCP (6), length 80052 [was 0, presumed TSO])
192.168.1.2.35663 > 192.168.1.1.38005: Flags [P.], cksum 0xbbfb (incorrect -> 0xe8f3), seq 341409049:341489049, ack 461929438, win 325, options [nop,nop,TS val 3707257633 ecr 891304888], length 80000
Binary file added tests/bigtcp-ipv4-geneve-ipv4.pcap
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3 changes: 3 additions & 0 deletions tests/bigtcp-ipv4-geneve-ipv6.out
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@@ -0,0 +1,3 @@
1 2025-10-03 14:03:56.656908 IP (tos 0x0, ttl 61, id 27215, offset 0, flags [none], proto UDP (17), length 80122 [was 0, presumed TSO])
10.25.132.11.60614 > 10.25.132.13.6081: Geneve, Flags [none], vni 0x1389
IP6 (flowlabel 0x75c1b, hlim 64, next-header TCP (6), payload length 0) [real length 80072, presumed BIG TCP] fd00::2.40433 > fd00::1.41423: Flags [P.], cksum 0x32ac (incorrect -> 0xe0f8), seq 79142004:79222004, ack 3545221731, win 319, options [nop,nop,TS val 1489592988 ecr 3996598946], length 80000
Binary file added tests/bigtcp-ipv4-geneve-ipv6.pcap
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4 changes: 4 additions & 0 deletions tests/bigtcp-ipv4-vxlan-ipv4.out
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1 2025-10-02 15:12:35.180627 IP (tos 0x0, ttl 61, id 28457, offset 0, flags [none], proto UDP (17), length 80102 [was 0, presumed TSO])
10.25.132.11.47044 > 10.25.132.13.4789: VXLAN, flags [I] (0x08), vni 5001
IP (tos 0x0, ttl 64, id 31532, offset 0, flags [DF], proto TCP (6), length 80052 [was 0, presumed TSO])
192.168.1.2.36875 > 192.168.1.1.36449: Flags [P.], cksum 0xbbfb (incorrect -> 0xad1f), seq 497210414:497290414, ack 1007986268, win 370, options [nop,nop,TS val 3624964308 ecr 809011563], length 80000
Binary file added tests/bigtcp-ipv4-vxlan-ipv4.pcap
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3 changes: 3 additions & 0 deletions tests/bigtcp-ipv4-vxlan-ipv6.out
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1 2025-10-02 15:12:54.704284 IP (tos 0x0, ttl 61, id 59958, offset 0, flags [none], proto UDP (17), length 80046 [was 0, presumed TSO])
10.25.132.11.60879 > 10.25.132.13.4789: VXLAN, flags [I] (0x08), vni 5001
IP6 (flowlabel 0xac0c4, hlim 64, next-header TCP (6), payload length 0) [real length 79996, presumed BIG TCP] fd00::2.33673 > fd00::1.36425: Flags [P.], cksum 0x3260 (incorrect -> 0xb98b), seq 1339751239:1339831163, ack 3942433666, win 373, options [nop,nop,TS val 1407331035 ecr 3914336993], length 79924
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2 changes: 2 additions & 0 deletions tests/bigtcp-ipv4.out
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1 2025-10-02 15:05:40.030951 IP (tos 0x0, ttl 64, id 12031, offset 0, flags [DF], proto TCP (6), length 80052 [was 0, presumed TSO])
10.25.132.13.35871 > 10.25.132.11.36425: Flags [P.], cksum 0x54f2 (incorrect -> 0x199e), seq 4155358606:4155438606, ack 17023525, win 635, options [nop,nop,TS val 3921144597 ecr 3152931631], length 80000
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3 changes: 3 additions & 0 deletions tests/bigtcp-ipv6-geneve-ipv4.out
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1 2025-10-03 14:05:41.755329 IP6 (hlim 61, next-header UDP (17), payload length 0) [real length 80122, presumed BIG TCP] 2604:1380:4091:ce00::b.55411 > 2604:1380:4091:ce00::d.6081: [bad udp cksum 0xc928 -> 0xb00c!] Geneve, Flags [none], vni 0x1389
IP (tos 0x0, ttl 64, id 14015, offset 0, flags [DF], proto TCP (6), length 80052 [was 0, presumed TSO])
192.168.1.2.43959 > 192.168.1.1.39887: Flags [P.], cksum 0xbbfb (incorrect -> 0x0e24), seq 3918632444:3918712444, ack 4091711457, win 338, options [nop,nop,TS val 3707350883 ecr 891398138], length 80000
Binary file added tests/bigtcp-ipv6-geneve-ipv4.pcap
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2 changes: 2 additions & 0 deletions tests/bigtcp-ipv6-geneve-ipv6.out
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1 2025-10-03 14:05:54.176759 IP6 (hlim 64, next-header UDP (17), payload length 0) [real length 80142, presumed BIG TCP] 2604:1380:4091:ce00::d.23733 > 2604:1380:4091:ce00::b.6081: [bad udp cksum 0xc93c -> 0x5da5!] Geneve, Flags [none], vni 0x1389
IP6 (flowlabel 0xe4292, hlim 64, next-header TCP (6), payload length 0) [real length 80072, presumed BIG TCP] fd00::1.38339 > fd00::2.43997: Flags [P.], cksum 0x32ac (incorrect -> 0x61d4), seq 1386091372:1386171372, ack 3439981244, win 367, options [nop,nop,TS val 3996716466 ecr 1489710507], length 80000
Binary file added tests/bigtcp-ipv6-geneve-ipv6.pcap
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1 change: 1 addition & 0 deletions tests/bigtcp-ipv6-hbh.out
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@@ -0,0 +1 @@
1 2025-10-06 14:13:27.172200 IP6 (flowlabel 0xa31ee, hlim 64, next-header HBH (0), payload length 0) 2604:1380:4091:ce00::d > 2604:1380:4091:ce00::b: HBH (jumbo: 80040) 41851 > 43913: Flags [P.], cksum 0xc8eb (incorrect -> 0x3146), seq 592820498:592900498, ack 2512896041, win 2128, options [nop,nop,TS val 1186840160 ecr 4237097528], length 80000
Binary file added tests/bigtcp-ipv6-hbh.pcap
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3 changes: 3 additions & 0 deletions tests/bigtcp-ipv6-vxlan-ipv4.out
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1 2025-10-02 15:11:32.151342 IP6 (hlim 64, next-header UDP (17), payload length 0) [real length 80122, presumed BIG TCP] 2604:1380:4091:ce00::d.52238 > 2604:1380:4091:ce00::b.4789: [bad udp cksum 0xc928 -> 0xf351!] VXLAN, flags [I] (0x08), vni 5001
IP (tos 0x0, ttl 64, id 57048, offset 0, flags [DF], proto TCP (6), length 80052 [was 0, presumed TSO])
192.168.1.1.41873 > 192.168.1.2.38131: Flags [P.], cksum 0xbbfb (incorrect -> 0xe29f), seq 2347745286:2347825286, ack 3538766307, win 2495, options [nop,nop,TS val 808948535 ecr 3624901279], length 80000
Binary file added tests/bigtcp-ipv6-vxlan-ipv4.pcap
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2 changes: 2 additions & 0 deletions tests/bigtcp-ipv6-vxlan-ipv6.out
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1 2025-10-02 15:11:04.542102 IP6 (hlim 64, next-header UDP (17), payload length 0) [real length 80142, presumed BIG TCP] 2604:1380:4091:ce00::d.37059 > 2604:1380:4091:ce00::b.4789: [bad udp cksum 0xc93c -> 0x286f!] VXLAN, flags [I] (0x08), vni 5001
IP6 (flowlabel 0xbf7fd, hlim 64, next-header TCP (6), payload length 0) [real length 80072, presumed BIG TCP] fd00::1.40007 > fd00::2.40607: Flags [P.], cksum 0x32ac (incorrect -> 0xb3b0), seq 936978514:937058514, ack 729791262, win 368, options [nop,nop,TS val 3914226831 ecr 1407220872], length 80000
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1 change: 1 addition & 0 deletions tests/bigtcp-ipv6.out
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1 2025-10-02 15:09:21.939724 IP6 (flowlabel 0x81ccd, hlim 61, next-header TCP (6), payload length 0) [real length 80040, presumed BIG TCP] 2604:1380:4091:ce00::b.43267 > 2604:1380:4091:ce00::d.41219: Flags [P.], cksum 0xc8cb (incorrect -> 0x2ab4), seq 2265425561:2265505529, ack 3850636772, win 426, options [nop,nop,TS val 3564116459 ecr 3863151628], length 79968
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4 changes: 4 additions & 0 deletions tests/gso-ipv4-geneve-ipv4.out
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1 2025-10-03 16:29:23.634332 IP (tos 0x0, ttl 61, id 1208, offset 0, flags [none], proto UDP (17), length 7092)
10.25.132.11.5799 > 10.25.132.13.6081: Geneve, Flags [none], vni 0x1389
IP (tos 0x0, ttl 64, id 29210, offset 0, flags [DF], proto TCP (6), length 7042)
192.168.1.2.40769 > 192.168.1.1.37633: Flags [P.], cksum 0x9ec8 (incorrect -> 0x9dc7), seq 1260004295:1260011285, ack 2119234335, win 166, options [nop,nop,TS val 3715972762 ecr 900020017], length 6990
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3 changes: 3 additions & 0 deletions tests/gso-ipv4-geneve-ipv6.out
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1 2025-10-03 16:29:04.300378 IP (tos 0x0, ttl 61, id 2594, offset 0, flags [none], proto UDP (17), length 4256)
10.25.132.11.15130 > 10.25.132.13.6081: Geneve, Flags [none], vni 0x1389
IP6 (flowlabel 0x4cb3f, hlim 64, next-header TCP (6), payload length 4166) fd00::2.34235 > fd00::1.37399: Flags [.], cksum 0x0a51 (incorrect -> 0xeedb), seq 1812075153:1812079287, ack 1385650056, win 169, options [nop,nop,TS val 1498300631 ecr 4005306590], length 4134
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4 changes: 4 additions & 0 deletions tests/gso-ipv4-vxlan-ipv4.out
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1 2025-10-03 16:30:14.343441 IP (tos 0x0, ttl 61, id 12520, offset 0, flags [none], proto UDP (17), length 7092)
10.25.132.11.60345 > 10.25.132.13.4789: VXLAN, flags [I] (0x08), vni 5001
IP (tos 0x0, ttl 64, id 10282, offset 0, flags [DF], proto TCP (6), length 7042)
192.168.1.2.37099 > 192.168.1.1.41547: Flags [P.], cksum 0x9ec8 (incorrect -> 0x6674), seq 1925567864:1925574854, ack 2614339187, win 166, options [nop,nop,TS val 3716023471 ecr 900070726], length 6990
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3 changes: 3 additions & 0 deletions tests/gso-ipv4-vxlan-ipv6.out
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1 2025-10-03 16:30:29.672424 IP (tos 0x0, ttl 61, id 20154, offset 0, flags [none], proto UDP (17), length 4256)
10.25.132.11.55123 > 10.25.132.13.4789: VXLAN, flags [I] (0x08), vni 5001
IP6 (flowlabel 0x83f92, hlim 64, next-header TCP (6), payload length 4166) fd00::2.44479 > fd00::1.40145: Flags [.], cksum 0x0a51 (incorrect -> 0x7fa9), seq 4240990499:4240994633, ack 3328482507, win 2489, options [nop,nop,TS val 1498386003 ecr 4005391962], length 4134
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2 changes: 2 additions & 0 deletions tests/gso-ipv4.out
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1 2025-10-03 16:26:52.155133 IP (tos 0x0, ttl 61, id 41110, offset 0, flags [DF], proto TCP (6), length 7292)
10.25.132.11.38407 > 10.25.132.13.39701: Flags [P.], cksum 0x38b9 (incorrect -> 0xb3af), seq 964901299:964908539, ack 2308918948, win 166, options [nop,nop,TS val 3244203756 ecr 4012416721], length 7240
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3 changes: 3 additions & 0 deletions tests/gso-ipv6-geneve-ipv4.out
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1 2025-10-03 16:28:10.433497 IP6 (hlim 61, next-header UDP (17), payload length 6972) 2604:1380:4091:ce00::b.22155 > 2604:1380:4091:ce00::d.6081: [bad udp cksum 0xab91 -> 0xdcc1!] Geneve, Flags [none], vni 0x1389
IP (tos 0x0, ttl 64, id 51474, offset 0, flags [DF], proto TCP (6), length 6942)
192.168.1.2.36991 > 192.168.1.1.41507: Flags [P.], cksum 0x9e64 (incorrect -> 0xb694), seq 1242530197:1242537087, ack 2919862022, win 169, options [nop,nop,TS val 3715899561 ecr 899946816], length 6890
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2 changes: 2 additions & 0 deletions tests/gso-ipv6-geneve-ipv6.out
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1 2025-10-03 16:28:33.023345 IP6 (hlim 61, next-header UDP (17), payload length 6892) 2604:1380:4091:ce00::b.60561 > 2604:1380:4091:ce00::d.6081: [bad udp cksum 0xab41 -> 0xb221!] Geneve, Flags [none], vni 0x1389
IP6 (flowlabel 0x48db8, hlim 64, next-header TCP (6), payload length 6822) fd00::2.38687 > fd00::1.45505: Flags [P.], cksum 0x14b1 (incorrect -> 0xa8e0), seq 3469802238:3469809028, ack 2183910745, win 166, options [nop,nop,TS val 1498269354 ecr 4005275312], length 6790
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3 changes: 3 additions & 0 deletions tests/gso-ipv6-vxlan-ipv4.out
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1 2025-10-03 16:31:22.053904 IP6 (hlim 61, next-header UDP (17), payload length 6972) 2604:1380:4091:ce00::b.35971 > 2604:1380:4091:ce00::d.4789: [bad udp cksum 0xab91 -> 0x2867!] VXLAN, flags [I] (0x08), vni 5001
IP (tos 0x0, ttl 64, id 61850, offset 0, flags [DF], proto TCP (6), length 6942)
192.168.1.2.34737 > 192.168.1.1.42261: Flags [P.], cksum 0x9e64 (incorrect -> 0xd5cd), seq 459554290:459561180, ack 3104965599, win 169, options [nop,nop,TS val 3716091182 ecr 900138437], length 6890
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2 changes: 2 additions & 0 deletions tests/gso-ipv6-vxlan-ipv6.out
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1 2025-10-03 16:31:12.636043 IP6 (hlim 61, next-header UDP (17), payload length 4176) 2604:1380:4091:ce00::b.39902 > 2604:1380:4091:ce00::d.4789: [bad udp cksum 0xa0a5 -> 0xd93a!] VXLAN, flags [I] (0x08), vni 5001
IP6 (flowlabel 0xb986b, hlim 64, next-header TCP (6), payload length 4106) fd00::2.43583 > fd00::1.44175: Flags [.], cksum 0x0a15 (incorrect -> 0x07c8), seq 1840055637:1840059711, ack 989320780, win 166, options [nop,nop,TS val 1498428967 ecr 4005434925], length 4074
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1 change: 1 addition & 0 deletions tests/gso-ipv6.out
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1 2025-10-03 16:27:33.363746 IP6 (flowlabel 0x6e481, hlim 61, next-header TCP (6), payload length 7172) 2604:1380:4091:ce00::b.36539 > 2604:1380:4091:ce00::d.45393: Flags [P.], cksum 0xac4e (incorrect -> 0xd25e), seq 1110639583:1110646723, ack 3034762532, win 169, options [nop,nop,TS val 3655207884 ecr 3954243053], length 7140
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2 changes: 2 additions & 0 deletions tests/icmp-length-zero.out
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@@ -0,0 +1,2 @@
1 2025-10-06 13:09:13.000001 IP (tos 0x0, ttl 61, id 19706, offset 0, flags [DF], proto ICMP (1), length 84 [was 0, presumed TSO])
10.25.132.11 > 10.25.132.13: ICMP echo request, id 12931, seq 1, length 64
Binary file added tests/icmp-length-zero.pcap
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