X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/7c20d41d9dd088a12312d6855ed27f58bca14b80..HEAD:/print-vrrp.c diff --git a/print-vrrp.c b/print-vrrp.c index caef77e0..bd0bb30d 100644 --- a/print-vrrp.c +++ b/print-vrrp.c @@ -23,27 +23,21 @@ * FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.4 2001-07-20 03:16:23 guy Exp $"; -#endif +/* \summary: Virtual Router Redundancy Protocol (VRRP) printer */ -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif +#include -#include -#include -#include +#include "netdissect-stdinc.h" -#include - -#include "interface.h" +#include "netdissect.h" #include "extract.h" #include "addrtoname.h" +#include "ip.h" +#include "ipproto.h" /* - * RFC 2338: + * RFC 2338 (VRRP v2): + * * 0 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -63,13 +57,34 @@ static const char rcsid[] = * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Authentication Data (2) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * + * RFC 5798 (VRRP v3): + * + * 0 1 2 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | IPv4 Fields or IPv6 Fields | + * ... ... + * | | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * |Version| Type | Virtual Rtr ID| Priority |Count IPvX Addr| + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * |(rsvd) | Max Adver Int | Checksum | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | | + * + + + * | IPvX Address(es) | + * + + + * | | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /* Type */ #define VRRP_TYPE_ADVERTISEMENT 1 static const struct tok type2str[] = { - { VRRP_TYPE_ADVERTISEMENT, "advertisement" }, + { VRRP_TYPE_ADVERTISEMENT, "Advertisement" }, { 0, NULL } }; @@ -86,54 +101,88 @@ static const struct tok auth2str[] = { }; void -vrrp_print(register const u_char *bp, register u_int len, int ttl) +vrrp_print(netdissect_options *ndo, + const u_char *bp, u_int len, + const u_char *bp2, int ttl, + int ver) { - int version, type, auth_type; + int version, type, auth_type = VRRP_AUTH_NONE; /* keep compiler happy */ const char *type_s; - TCHECK(bp[0]); - version = (bp[0] & 0xf0) >> 4; - type = bp[0] & 0x0f; - type_s = tok2str(type2str, "type#%d", type); - printf("VRRPv%d-%s %d: ", version, type_s, len); + ndo->ndo_protocol = "vrrp"; + nd_print_protocol_caps(ndo); + version = (GET_U_1(bp) & 0xf0) >> 4; + type = GET_U_1(bp) & 0x0f; + type_s = tok2str(type2str, "unknown type (%u)", type); + ND_PRINT("v%u, %s", version, type_s); if (ttl != 255) - printf("[ttl=%d!] ", ttl); - if (version != 2 || type != VRRP_TYPE_ADVERTISEMENT) + ND_PRINT(", (ttl %u)", ttl); + if (version < 2 || version > 3 || type != VRRP_TYPE_ADVERTISEMENT) return; - TCHECK(bp[2]); - printf("vrid=%d prio=%d", bp[1], bp[2]); - TCHECK(bp[5]); - auth_type = bp[4]; - printf(" authtype=%s", tok2str(auth2str, NULL, auth_type)); - printf(" intvl=%d", bp[5]); - if (vflag) { - int naddrs = bp[3]; - int i; + ND_PRINT(", vrid %u, prio %u", GET_U_1(bp + 1), GET_U_1(bp + 2)); + + if (version == 2) { + auth_type = GET_U_1(bp + 4); + ND_PRINT(", authtype %s", tok2str(auth2str, NULL, auth_type)); + ND_PRINT(", intvl %us, length %u", GET_U_1(bp + 5), len); + } else { /* version == 3 */ + uint16_t intvl = (GET_U_1(bp + 4) & 0x0f) << 8 | GET_U_1(bp + 5); + ND_PRINT(", intvl %ucs, length %u", intvl, len); + } + + if (ndo->ndo_vflag) { + u_int naddrs = GET_U_1(bp + 3); + u_int i; char c; - if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0)) - printf(" (bad vrrp cksum %x!)", - EXTRACT_16BITS(&bp[6])); - printf(" addrs"); + if (version == 2 && ND_TTEST_LEN(bp, len)) { + struct cksum_vec vec[1]; + + vec[0].ptr = bp; + vec[0].len = len; + if (in_cksum(vec, 1)) + ND_PRINT(", (bad vrrp cksum %x)", + GET_BE_U_2(bp + 6)); + } + + if (version == 3 && ND_TTEST_LEN(bp, len)) { + uint16_t cksum; + + if (ver == 4) + cksum = nextproto4_cksum(ndo, (const struct ip *)bp2, bp, + len, len, IPPROTO_VRRP); + else + cksum = nextproto6_cksum(ndo, (const struct ip6_hdr *)bp2, bp, + len, len, IPPROTO_VRRP); + if (cksum) + ND_PRINT(", (bad vrrp cksum %x)", + GET_BE_U_2(bp + 6)); + } + + ND_PRINT(", addrs"); if (naddrs > 1) - printf("(%d)", naddrs); - printf(":"); + ND_PRINT("(%u)", naddrs); + ND_PRINT(":"); c = ' '; bp += 8; for (i = 0; i < naddrs; i++) { - TCHECK(bp[3]); - printf("%c%s", c, ipaddr_string(bp)); + if (ver == 4) { + ND_PRINT("%c%s", c, GET_IPADDR_STRING(bp)); + bp += 4; + } else { + ND_PRINT("%c%s", c, GET_IP6ADDR_STRING(bp)); + bp += 16; + } c = ','; - bp += 4; } - if (auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */ - TCHECK(bp[7]); - printf(" auth \""); - fn_printn(bp, bp[7] - bp[0] + 1, NULL); - printf("\""); + if (version == 2 && auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */ + ND_PRINT(" auth \""); + /* + * RFC 2338 Section 5.3.10: "If the configured authentication string + * is shorter than 8 bytes, the remaining space MUST be zero-filled. + */ + nd_printjnp(ndo, bp, 8); + ND_PRINT("\""); } } - return; -trunc: - printf("[|vrrp]"); }