diff options
| author | David Gwynne <dlg@cvs.openbsd.org> | 2018-02-08 22:56:29 +0000 |
|---|---|---|
| committer | David Gwynne <dlg@cvs.openbsd.org> | 2018-02-08 22:56:29 +0000 |
| commit | 5a491ed020e39345055071e2e63ddfa0ff86c319 (patch) | |
| tree | ee91939e4972c734afef649cac04de98f9a78a04 | |
| parent | 7b422dbe35a4c60e3ff3e73d839c172c7a83516f (diff) | |
have a go at decoding cisco wccp gre packets, and let them fall into IP.
| -rw-r--r-- | usr.sbin/tcpdump/print-gre.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/usr.sbin/tcpdump/print-gre.c b/usr.sbin/tcpdump/print-gre.c index 4890cf87517..19be61f5b66 100644 --- a/usr.sbin/tcpdump/print-gre.c +++ b/usr.sbin/tcpdump/print-gre.c @@ -1,4 +1,4 @@ -/* $OpenBSD: print-gre.c,v 1.15 2018/02/08 09:01:45 dlg Exp $ */ +/* $OpenBSD: print-gre.c,v 1.16 2018/02/08 22:56:28 dlg Exp $ */ /* * Copyright (c) 2002 Jason L. Wright (jason@thought.net) @@ -66,6 +66,17 @@ #define NVGRE_FLOWID_MASK 0x000000ffU #define NVGRE_FLOWID_SHIFT 0 +#define GRE_WCCP 0x883e + +struct wccp_redirect { + uint8_t flags; +#define WCCP_D (1 << 7) +#define WCCP_A (1 << 6) + uint8_t ServiceId; + uint8_t AltBucket; + uint8_t PriBucket; +}; + void gre_print_0(const u_char *, u_int); void gre_print_1(const u_char *, u_int); void gre_sre_print(u_int16_t, u_int8_t, u_int8_t, const u_char *, u_int); @@ -207,6 +218,28 @@ gre_print_0(const u_char *p, u_int length) case 0: printf("keep-alive"); break; + case GRE_WCCP: { + struct wccp_redirect *wccp; + + printf("wccp "); + if (l < sizeof(*wccp)) { + printf("[|wccp]"); + return; + } + + wccp = (struct wccp_redirect *)p; + + printf("D:%c A:%c SId:%u Alt:%u Pri:%u", + (wccp->flags & WCCP_D) ? '1' : '0', + (wccp->flags & WCCP_A) ? '1' : '0', + wccp->ServiceId, wccp->AltBucket, wccp->PriBucket); + + p += sizeof(*wccp); + l -= sizeof(*wccp); + + printf(": "); + /* FALLTHROUGH */ + } case ETHERTYPE_IP: ip_print(p, length); break; |