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guyharrisguyharris
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Handle UDP checksums more like TCP checksums.
Instead of printing the result of udp_cksum() if it's non-zero, print the checksum field value and the value it should have had. That means that what we print is the same regardless of whether we're running on a big-endian or little-endian machine. Also, just as we did with TCP: Check -v and -K, and the fragmented flag, up front; then check the IP version etc.. Don't check for IPv6 if we already know it's IPv4. Fetch the checksum field only once. Update some test files for the new output format.
1 parent 9bfe2ab commit 7074f77

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3 files changed

+78
-63
lines changed

3 files changed

+78
-63
lines changed

‎print-udp.c

+36-21
Original file line numberDiff line numberDiff line change
@@ -549,31 +549,46 @@ udp_print(register const u_char *bp, u_int length,
549549
}
550550
udpipaddr_print(ip, sport, dport);
551551

552-
if (IP_V(ip) == 4 && (vflag > 1) && !Kflag && !fragmented) {
553-
int sum = up->uh_sum;
554-
if (sum == 0) {
555-
(void)printf("[no cksum] ");
556-
} else if (TTEST2(cp[0], length)) {
557-
sum = udp_cksum(ip, up, length + sizeof(struct udphdr));
558-
if (sum != 0)
559-
(void)printf("[bad udp cksum %x!] ", sum);
560-
else
561-
(void)printf("[udp sum ok] ");
552+
if (vflag && !Kflag && !fragmented) {
553+
/* Check the checksum, if possible. */
554+
u_int16_t sum, udp_sum;
555+
556+
/*
557+
* XXX - do this even if vflag == 1?
558+
* TCP does, and we do so for UDP-over-IPv6.
559+
*/
560+
if (IP_V(ip) == 4 && (vflag > 1)) {
561+
udp_sum = EXTRACT_16BITS(&up->uh_sum);
562+
if (udp_sum == 0) {
563+
(void)printf("[no cksum] ");
564+
} else if (TTEST2(cp[0], length)) {
565+
sum = udp_cksum(ip, up, length + sizeof(struct udphdr));
566+
567+
if (sum != 0) {
568+
(void)printf("[bad udp cksum 0x%04x -> 0x%04x!] ",
569+
udp_sum,
570+
in_cksum_shouldbe(udp_sum, sum));
571+
} else
572+
(void)printf("[udp sum ok] ");
573+
}
562574
}
563-
}
564575
#ifdef INET6
565-
if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !Kflag && !fragmented) {
566-
int sum = up->uh_sum;
567-
/* for IPv6, UDP checksum is mandatory */
568-
if (TTEST2(cp[0], length)) {
569-
sum = udp6_cksum(ip6, up, length + sizeof(struct udphdr));
570-
if (sum != 0)
571-
(void)printf("[bad udp cksum %x!] ", sum);
572-
else
573-
(void)printf("[udp sum ok] ");
576+
else if (IP_V(ip) == 6 && ip6->ip6_plen) {
577+
/* for IPv6, UDP checksum is mandatory */
578+
if (TTEST2(cp[0], length)) {
579+
sum = udp6_cksum(ip6, up, length + sizeof(struct udphdr));
580+
udp_sum = EXTRACT_16BITS(&up->uh_sum);
581+
582+
if (sum != 0) {
583+
(void)printf("[bad udp cksum 0x%04x -> 0x%04x!] ",
584+
udp_sum,
585+
in_cksum_shouldbe(udp_sum, sum));
586+
} else
587+
(void)printf("[udp sum ok] ");
588+
}
574589
}
575-
}
576590
#endif
591+
}
577592

578593
if (!qflag) {
579594
#define ISPORT(p) (dport == (p) || sport == (p))

‎tests/ikev2fourv.out

+21-21
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
IP (tos 0x0, ttl 64, id 19908, offset 0, flags [none], proto UDP (17), length 404)
2-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 7aee!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->0000000000000000: parent_sa ikev2_init[I]:
2+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x0765 -> 0xf5df!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->0000000000000000: parent_sa ikev2_init[I]:
33
(sa: len=116
44
(p: #1 protoid=isakmp transform=12 len=116
55
(t: #1 type=encr id=aes (type=keylen value=0080))
@@ -19,10 +19,10 @@ IP (tos 0x0, ttl 64, id 19908, offset 0, flags [none], proto UDP (17), length 40
1919
(n: prot_id=#0 type=16388(nat_detection_source_ip))
2020
(n: prot_id=#0 type=16389(nat_detection_destination_ip))
2121
IP (tos 0x0, ttl 64, id 19909, offset 0, flags [none], proto UDP (17), length 88)
22-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum a706!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->0000000000000000: parent_sa ikev2_init[R]:
22+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x0629 -> 0x0cd0!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->0000000000000000: parent_sa ikev2_init[R]:
2323
(n: prot_id=#0 type=16390(cookie) data=(00000001c2221e50c16e123f2b0c71aefcf0cb3b798782c6))
2424
IP (tos 0x0, ttl 64, id 19910, offset 0, flags [none], proto UDP (17), length 436)
25-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 7d6f!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->0000000000000000: parent_sa ikev2_init[I]:
25+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x0785 -> 0x7702!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->0000000000000000: parent_sa ikev2_init[I]:
2626
(n: prot_id=#0 type=16390(cookie) data=(00000001c2221e50c16e...ba041b5de59955900d818ac54e18b236739d9e8b))
2727
(sa: len=116
2828
(p: #1 protoid=isakmp transform=12 len=116
@@ -43,7 +43,7 @@ IP (tos 0x0, ttl 64, id 19910, offset 0, flags [none], proto UDP (17), length 43
4343
(n: prot_id=#0 type=16388(nat_detection_source_ip))
4444
(n: prot_id=#0 type=16389(nat_detection_destination_ip))
4545
IP (tos 0x0, ttl 64, id 19911, offset 0, flags [none], proto UDP (17), length 332)
46-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 337f!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->71be8358efae7663: parent_sa ikev2_init[R]:
46+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x071d -> 0x8650!] isakmp 2.0 msgid 00000000 cookie a88875a8198992a6->71be8358efae7663: parent_sa ikev2_init[R]:
4747
(sa: len=44
4848
(p: #1 protoid=isakmp transform=4 len=44
4949
(t: #1 type=encr id=aes (type=keylen value=0080))
@@ -55,53 +55,53 @@ IP (tos 0x0, ttl 64, id 19911, offset 0, flags [none], proto UDP (17), length 33
5555
(n: prot_id=#0 type=16388(nat_detection_source_ip))
5656
(n: prot_id=#0 type=16389(nat_detection_destination_ip))
5757
IP (tos 0x0, ttl 64, id 19912, offset 0, flags [none], proto UDP (17), length 264)
58-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum fdaa!] isakmp 2.0 msgid 00000001 cookie a88875a8198992a6->71be8358efae7663: child_sa ikev2_auth[I]:
58+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x07d9 -> 0xb2d6!] isakmp 2.0 msgid 00000001 cookie a88875a8198992a6->71be8358efae7663: child_sa ikev2_auth[I]:
5959
(v2e: len=204 f606135ad373e70836fda91b63ca4c608e1ad58218488c2647ff1e8a912958aa77efbc3068a2ae6ab7c3d0cb1e6fb864df99c62f2cc045708084708154a393c2f4cbefad1f6848525d49db563e13345a4e6e2fd066c04e2ce291f4714baec6bf328356c446247cab835bda3e8e1aae5967248f01eb3a1c02a541b4da09b3276b400d50a067542a678468c5f41e54017c00964f1003f8c88896a6f12215a5f1a060713cc83802cae3abee18417c0c35dc6f58a01adb96ed1c009c68e3069ae70f4b10afb7736c111ade4d826e)
6060
IP (tos 0x0, ttl 64, id 19913, offset 0, flags [none], proto UDP (17), length 184)
61-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum bf00!] isakmp 2.0 msgid 00000001 cookie a88875a8198992a6->71be8358efae7663: child_sa ikev2_auth[R]:
61+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x0689 -> 0x0748!] isakmp 2.0 msgid 00000001 cookie a88875a8198992a6->71be8358efae7663: child_sa ikev2_auth[R]:
6262
(v2e: len=124 6afe95bc5147b0ad7e4ccb9141c160a44f7c6eddc6b29d414ad5e2b882544fdc6c3ee6983ae1408b5764b1649343876454d1bf4d515aaf03c15eafe71be6b4cf51ab60630c45bcf0e2a2db8eee70095a4e010fdb342adb6d03dae5def9d4907cdfc8ccd6f3da9b7497c58e84a952d983bafb941ab1de1b0bb9ffad3b)
6363
IP (tos 0x0, ttl 64, id 19914, offset 0, flags [none], proto UDP (17), length 280)
64-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum c32d!] isakmp 2.0 msgid 00000002 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
64+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x07e9 -> 0x35ac!] isakmp 2.0 msgid 00000002 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
6565
(v2e: len=220 53cc6c0b41f14e4fc057c7f6a3524adde8521f26f67c058430a902db1a52ed16d322630d2eb515372dc12d97dc7c20552607e2ed193d9b33939e10aa2fc37b6199f0a629c6b58135f5b6f9e07906cd30dc3cae7d55fe08d95d3e660a623731c396a325adbff11c490f9fd102224391a65fb7bbe862945b64cf1fb833b9ce68c83df0b9d2ce7bd54f650864af9445e547cdfe5caa393344ae5274933b7efcf616821ea7daa9c5a6e8275ad6c688700cb7f4bcd6fb8025e93bb6dd5f581faebcbecb798c87617a4ec1b06ba290ac5fc1d6e4c2725c1f9f0e10b144fbbe)
6666
IP (tos 0x0, ttl 64, id 19915, offset 0, flags [none], proto UDP (17), length 248)
67-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum e6d7!] isakmp 2.0 msgid 00000003 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
67+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x06c9 -> 0xdeaf!] isakmp 2.0 msgid 00000003 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
6868
(v2e: len=188 9603e03f280964782717da15a502f0a9e9f17dbf4487c6923cf00b7040d539bc947c705790e4e99b834a7ae2a8d79f5620e11615e0a762889aab821e0d03132dfb8cc6b3718582411bcd98c242a8b10a66274dae1ce055fb30a4d3e64c969be6e08b626958f4446c6e4a0c8d7a24522959c6152e63a575c06930c2097539bfbdff08c70533428cf6b452e0b8b0259c2292925d2ed62e8956bc7e3a911a61509be1ac8f7b7cd4636176e524f4d0f17573f2aeddce2251fd6d5d9cd54d)
6969
IP (tos 0x0, ttl 64, id 19916, offset 0, flags [none], proto UDP (17), length 104)
70-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum f2c0!] isakmp 2.0 msgid 00000002 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
70+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x0639 -> 0xc72b!] isakmp 2.0 msgid 00000002 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
7171
(v2e: len=44 5bd2d26cb43b6cec30dec13fa387359797baf7b41e783422bc4dabf5d03ab2420d277d3b2f28d1f003da98d1)
7272
IP (tos 0x0, ttl 64, id 19917, offset 0, flags [none], proto UDP (17), length 104)
73-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum e03a!] isakmp 2.0 msgid 00000003 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
73+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x0639 -> 0x4119!] isakmp 2.0 msgid 00000003 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
7474
(v2e: len=44 38f60ab69110967961ae04af4e47a770260d61e29d18fb13ce093a47970068dacb342f7999cc3d0d59f77a94)
7575
IP (tos 0x0, ttl 64, id 19918, offset 0, flags [none], proto UDP (17), length 312)
76-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 661c!] isakmp 2.0 msgid 00000004 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
76+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x0709 -> 0x236f!] isakmp 2.0 msgid 00000004 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
7777
(v2e: len=252 c7f2f1cc4997b30a61623222d4bfb535baa302199c4d8c1fdcfa745b0b29b5e7618ff0356848444d25010e5ad420760890ede066c838269b22d9e30d4fec1a012e731a210c243f803b661970d32e998e919f573c5742d2288949052c5a46a0cd7c4a1a295ede296c4fd9839b64dc4944e11a35f42a8ce18b447200fd03dbd58a71583b3a27c380148c801ce14452f7d756b1f55b10b84a58cfa9526001fff7157154645022e4456085517ceed98b79e20ed33297cf5ad80287e782728a8c6b87d2b422e7eeda1c72b33ebc51a5b76def9a59ffd1b4f97dec88c22a4f5448a71aeedf20c87dae5b44cd2e7a519d719a509f83f3b2faf6f5c607da609f)
7878
IP (tos 0x0, ttl 64, id 19919, offset 0, flags [none], proto UDP (17), length 280)
79-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum d1d0!] isakmp 2.0 msgid 00000005 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
79+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x07e9 -> 0xd8ba!] isakmp 2.0 msgid 00000005 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
8080
(v2e: len=220 dae6134a9cff1a4e3cc59a79e019a93f8469dd4e2faaaad1c3afba22ecd128fdb1e8954c753f8f62aeb6aac9732f414b065ec39569a670be6980c81eb3e44bc93ec63e9a754d0456c6703cd718371edeef674928180f9d14c39e52cfa4a517368e7db2fa0bfdb41cf56d97006233103f22650fdcd5ffab8418e40903e4749e126d06e9dc2a18cfd5bfda0013e3e9eb53e79bbe30eadf0f4ddcefbab0c08e870b29d39b2401c75b68fc46a066782857ca48d547e410ac15cabb6738875200b535cbd9ae1e1ce99839c9c25639070e5ed977809c50b6bb9550b50b49bb)
8181
IP (tos 0x0, ttl 64, id 19920, offset 0, flags [none], proto UDP (17), length 232)
82-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum db6a!] isakmp 2.0 msgid 00000004 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
82+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x06b9 -> 0x7194!] isakmp 2.0 msgid 00000004 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
8383
(v2e: len=172 1fd8516b57b1ab1bdbcdba1930a5097decc023c5c534497ca53f178b9d4d11228746454371b0cc6ec067e14e1e5c5652840cfdae0ea84c7f0a6e799ff7fb131d15763feef45e80f24716cde47d23527f68e055a7c3adc7225489295e1bc3f1029b63822872865df55c6c275dead8a6f64bda8ae44f42c318fa71eb04eed7312dafd2dd8665fd5d3225f3aae6f7335b581c3a89c07af1009871dea9927f046432cd01b04234204d01583baf3a)
8484
IP (tos 0x0, ttl 64, id 19921, offset 0, flags [none], proto UDP (17), length 232)
85-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 9a59!] isakmp 2.0 msgid 00000005 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
85+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x06b9 -> 0x6053!] isakmp 2.0 msgid 00000005 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
8686
(v2e: len=172 f6fc8113f34b92eb7d595a048f57d46593441ad9a61919e5919e7de4454fa35882937d3b74c83ab959fd053c6a12a51b04a0e92e01683782658bb9af2bbcc7a4bd5e1eef2dbcdc7715cac6eaecfbcc051a46f2263d1b8387bdad7e68c6e4ba1be9794e163e484768995a9f4a18edcbc6a44f0a74cb01c318e7848562e0866f388b8d04f14f1af87de7de6cee1f889d4330d82932a7127b7d1a934e641c32b76e33b37706d50286f8cbe335ba)
8787
IP (tos 0x0, ttl 64, id 19922, offset 0, flags [none], proto UDP (17), length 312)
88-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 5ff4!] isakmp 2.0 msgid 00000006 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
88+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x0709 -> 0xfb68!] isakmp 2.0 msgid 00000006 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
8989
(v2e: len=252 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)
9090
IP (tos 0x0, ttl 64, id 19923, offset 0, flags [none], proto UDP (17), length 280)
91-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 9890!] isakmp 2.0 msgid 00000007 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
91+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x07e9 -> 0x9881!] isakmp 2.0 msgid 00000007 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
9292
(v2e: len=220 02c703f4bdd83246adc67e1ca07d7e7cfe21b6bde94637680a332813b8a4ca47341abd3a9c37263896c08252bfb1ea6c7ea44783b92ac52acb4fbfec53f03554281c6377650c09208f3d778b11e77b5fbd983be1e96699232392ef31a501fda73c6150fcc2e80bab1e0d49845bd5d511f7c9285ec08352687a2ac8d70d0dec3476491c40b97cb9da405606fc5e8d46bbe199e6d91ae993b7faa0583ec4296a80812fb7e0ae88d3bd54c4a30e5edb2778c960f3e0cb5b1369e999f84de4dc72b5d006805efb7e2d2ed4033e11ff9578012d22942e3799c9382506a021)
9393
IP (tos 0x0, ttl 64, id 19924, offset 0, flags [none], proto UDP (17), length 232)
94-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 902e!] isakmp 2.0 msgid 00000006 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
94+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x06b9 -> 0x3549!] isakmp 2.0 msgid 00000006 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
9595
(v2e: len=172 7e2e6623c66e161de9641ac7e1b6dfdcf3a5f45bbed123be88f3754d12514404afc054b3c7f789eb52a432a438359dde31152c11b8d209203d62779ca064823d70536c40f846d43d6694a2f12a3176f57007a3506c82fffaf3dbb713bbdbb5f540b7b39aee3c97145671504356095f7ab0c5a84347c0268bce259ca51b4a2dd75a7e3a7ee79f3bffc58d2fc0ac36686229f2309b5cd0c0dcc2af798664c14f5f166ab5e3c1f693092121aa44)
9696
IP (tos 0x0, ttl 64, id 19925, offset 0, flags [none], proto UDP (17), length 232)
97-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 49dd!] isakmp 2.0 msgid 00000007 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
97+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x06b9 -> 0xe402!] isakmp 2.0 msgid 00000007 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
9898
(v2e: len=172 7b545033a2d35df2ab9f26c4bc444713910a32e60fb04cb10a9e76634787f9ddc138c6792faa074be2ebcb43f83f444249679018ec6dc7d4e2247dd8cb915778d90fa5597f1ecba8471db53e3b4da8f73d1eb60c23ca9fb5fa599dc526a961364471b49e5288fcef6a24d02a084d29c4a5c5d1fa305310dba01d09c9c36c86c0af297e05d3fc8559a11666a4363bacc354e96c941349b3f60dd397eb4c2bb09f381831167c0b33686c6bb5d8)
9999
IP (tos 0x0, ttl 64, id 19926, offset 0, flags [none], proto UDP (17), length 392)
100-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 1d29!] isakmp 2.0 msgid 00000008 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
100+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x0759 -> 0x3076!] isakmp 2.0 msgid 00000008 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[I]:
101101
(v2e: len=332 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)
102102
IP (tos 0x0, ttl 64, id 19927, offset 0, flags [none], proto UDP (17), length 344)
103-
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 25cf!] isakmp 2.0 msgid 00000008 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
103+
192.168.1.1.500 > 192.168.1.2.500: [bad udp cksum 0x0729 -> 0xd64e!] isakmp 2.0 msgid 00000008 cookie a88875a8198992a6->71be8358efae7663: child_sa child_sa[R]:
104104
(v2e: len=284 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)
105105
IP (tos 0x0, ttl 64, id 19928, offset 0, flags [none], proto UDP (17), length 120)
106-
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 6e7f!] isakmp 2.0 msgid 00000000 cookie 1d9be9451d4f97a8->64a2a4b5d0e17b6a: parent_sa inf2[I]:
106+
192.168.1.2.500 > 192.168.1.1.500: [bad udp cksum 0x0649 -> 0x85b7!] isakmp 2.0 msgid 00000000 cookie 1d9be9451d4f97a8->64a2a4b5d0e17b6a: parent_sa inf2[I]:
107107
(v2e: len=60 691b48829b6c5d6dd93fa8e33c38dd4c00f5434dc22b4251c0876f0bdb5dbba3dd06283907559a272f07ec7709b9d596a24cd8fe69b82a1f65dbf6f2)

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