X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/d38c366e0b646887210f7df7d0da5f7afdf2b316..1a04b92e365f5ed01ca38619b41bcc4fc9cbd63c:/print-vrrp.c diff --git a/print-vrrp.c b/print-vrrp.c index fefb2d9a..b7e309d0 100644 --- a/print-vrrp.c +++ b/print-vrrp.c @@ -23,25 +23,23 @@ * FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.2 2000-07-29 06:22:17 assar Exp $"; -#endif +/* \summary: Virtual Router Redundancy Protocol (VRRP) printer */ #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include -#include -#include +#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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ @@ -61,58 +59,125 @@ 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" }, + { 0, NULL } +}; + +/* Auth Type */ +#define VRRP_AUTH_NONE 0 +#define VRRP_AUTH_SIMPLE 1 +#define VRRP_AUTH_AH 2 + +static const struct tok auth2str[] = { + { VRRP_AUTH_NONE, "none" }, + { VRRP_AUTH_SIMPLE, "simple" }, + { VRRP_AUTH_AH, "ah" }, + { 0, NULL } +}; + 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 version, type, auth_type; - char *type_s; - - TCHECK(bp[0]); - version = (bp[0] & 0xf0) >> 4; - type = bp[0] & 0x0f; - if (type == 1) - type_s = "advertise"; - else - type_s = "unknown"; - printf("VRRPv%d-%s %d: ", version, type_s, len); + int version, type, auth_type = VRRP_AUTH_NONE; /* keep compiler happy */ + const char *type_s; + + ND_TCHECK_1(bp); + version = (EXTRACT_U_1(bp) & 0xf0) >> 4; + type = EXTRACT_U_1(bp) & 0x0f; + type_s = tok2str(type2str, "unknown type (%u)", type); + ND_PRINT((ndo, "VRRPv%u, %s", version, type_s)); if (ttl != 255) - printf("[ttl=%d!] ", ttl); - if (version != 2 || type != 1) + ND_PRINT((ndo, ", (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]; - if (auth_type != 0) - printf(" authtype=%d", auth_type); - printf(" intvl=%d", bp[5]); - if (vflag) { - int naddrs = bp[3]; + ND_TCHECK_1(bp + 2); + ND_PRINT((ndo, ", vrid %u, prio %u", EXTRACT_U_1(bp + 1), EXTRACT_U_1(bp + 2))); + ND_TCHECK_1(bp + 5); + + if (version == 2) { + auth_type = EXTRACT_U_1(bp + 4); + ND_PRINT((ndo, ", authtype %s", tok2str(auth2str, NULL, auth_type))); + ND_PRINT((ndo, ", intvl %us, length %u", EXTRACT_U_1(bp + 5), len)); + } else { /* version == 3 */ + uint16_t intvl = (EXTRACT_U_1(bp + 4) & 0x0f) << 8 | EXTRACT_U_1(bp + 5); + ND_PRINT((ndo, ", intvl %ucs, length %u", intvl, len)); + } + + if (ndo->ndo_vflag) { + int naddrs = EXTRACT_U_1(bp + 3); 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((ndo, ", (bad vrrp cksum %x)", + EXTRACT_BE_U_2(bp + 6))); + } + + if (version == 3 && ND_TTEST_LEN(bp, len)) { + uint16_t cksum = nextproto4_cksum(ndo, (const struct ip *)bp2, bp, + len, len, IPPROTO_VRRP); + if (cksum) + ND_PRINT((ndo, ", (bad vrrp cksum %x)", + EXTRACT_BE_U_2(bp + 6))); + } + + ND_PRINT((ndo, ", addrs")); if (naddrs > 1) - printf("(%d)", naddrs); - printf(":"); + ND_PRINT((ndo, "(%d)", naddrs)); + ND_PRINT((ndo, ":")); c = ' '; bp += 8; for (i = 0; i < naddrs; i++) { - TCHECK(bp[3]); - printf("%c%s", c, ipaddr_string(bp)); + ND_TCHECK_1(bp + 3); + ND_PRINT((ndo, "%c%s", c, ipaddr_string(ndo, bp))); c = ','; bp += 4; } - if (auth_type == 1) { /* simple text password */ - TCHECK(bp[7]); - printf(" auth %.8s", bp); + if (version == 2 && auth_type == VRRP_AUTH_SIMPLE) { /* simple text password */ + ND_TCHECK_1(bp + 7); + ND_PRINT((ndo, " auth \"")); + if (fn_printn(ndo, bp, 8, ndo->ndo_snapend)) { + ND_PRINT((ndo, "\"")); + goto trunc; + } + ND_PRINT((ndo, "\"")); } } return; trunc: - printf("[|vrrp]"); + ND_PRINT((ndo, "[|vrrp]")); }