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+/*
+ * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/* \summary: Routing Information Protocol (RIP) printer */
+
+/* specification: RFC 1058, RFC 2453, RFC 4822 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+#include "af.h"
+
+
+/*
+ * RFC 1058 and RFC 2453 header of packet.
+ *
+ * 0 1 2 3 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Command (1) | Version (1) | unused |
+ * +---------------+---------------+-------------------------------+
+ */
+struct rip {
+ nd_uint8_t rip_cmd; /* request/response */
+ nd_uint8_t rip_vers; /* protocol version # */
+ nd_byte unused[2]; /* unused */
+};
+
+#define RIPCMD_REQUEST 1 /* want info */
+#define RIPCMD_RESPONSE 2 /* responding to request */
+#define RIPCMD_TRACEON 3 /* turn tracing on */
+#define RIPCMD_TRACEOFF 4 /* turn it off */
+#define RIPCMD_POLL 5 /* want info from everybody */
+#define RIPCMD_POLLENTRY 6 /* poll for entry */
+
+static const struct tok rip_cmd_values[] = {
+ { RIPCMD_REQUEST, "Request" },
+ { RIPCMD_RESPONSE, "Response" },
+ { RIPCMD_TRACEON, "Trace on" },
+ { RIPCMD_TRACEOFF, "Trace off" },
+ { RIPCMD_POLL, "Poll" },
+ { RIPCMD_POLLENTRY, "Poll Entry" },
+ { 0, NULL}
+};
+
+#define RIP_AUTHLEN 16
+#define RIP_ROUTELEN 20
+
+/*
+ * First 4 bytes of all RIPv1/RIPv2 entries.
+ */
+struct rip_entry_header {
+ nd_uint16_t rip_family;
+ nd_uint16_t rip_tag;
+};
+
+/*
+ * RFC 1058 entry.
+ *
+ * 0 1 2 3 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Address Family Identifier (2) | must be zero (2) |
+ * +-------------------------------+-------------------------------+
+ * | IP Address (4) |
+ * +---------------------------------------------------------------+
+ * | must be zero (4) |
+ * +---------------------------------------------------------------+
+ * | must be zero (4) |
+ * +---------------------------------------------------------------+
+ * | Metric (4) |
+ * +---------------------------------------------------------------+
+ */
+struct rip_netinfo_v1 {
+ nd_uint16_t rip_family;
+ nd_byte rip_mbz1[2];
+ nd_ipv4 rip_dest;
+ nd_byte rip_mbz2[4];
+ nd_byte rip_mbz3[4];
+ nd_uint32_t rip_metric; /* cost of route */
+};
+
+
+/*
+ * RFC 2453 route entry
+ *
+ * 0 1 2 3 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Address Family Identifier (2) | Route Tag (2) |
+ * +-------------------------------+-------------------------------+
+ * | IP Address (4) |
+ * +---------------------------------------------------------------+
+ * | Subnet Mask (4) |
+ * +---------------------------------------------------------------+
+ * | Next Hop (4) |
+ * +---------------------------------------------------------------+
+ * | Metric (4) |
+ * +---------------------------------------------------------------+
+ *
+ */
+
+struct rip_netinfo_v2 {
+ nd_uint16_t rip_family;
+ nd_uint16_t rip_tag;
+ nd_ipv4 rip_dest;
+ nd_uint32_t rip_dest_mask;
+ nd_ipv4 rip_router;
+ nd_uint32_t rip_metric; /* cost of route */
+};
+
+/*
+ * RFC 2453 authentication entry
+ *
+ * 0 1 2 3 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | 0xFFFF | Authentication Type (2) |
+ * +-------------------------------+-------------------------------+
+ * - Authentication (16) -
+ * +---------------------------------------------------------------+
+ */
+
+struct rip_auth_v2 {
+ nd_uint16_t rip_family;
+ nd_uint16_t rip_tag;
+ nd_byte rip_auth[16];
+};
+
+/*
+ * RFC 4822 Cryptographic Authentication entry.
+ *
+ * 0 1 2 3 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | RIPv2 Packet Length | Key ID | Auth Data Len |
+ * +---------------+---------------+---------------+---------------+
+ * | Sequence Number (non-decreasing) |
+ * +---------------+---------------+---------------+---------------+
+ * | reserved must be zero |
+ * +---------------+---------------+---------------+---------------+
+ * | reserved must be zero |
+ * +---------------+---------------+---------------+---------------+
+ */
+struct rip_auth_crypto_v2 {
+ nd_uint16_t rip_packet_len;
+ nd_uint8_t rip_key_id;
+ nd_uint8_t rip_auth_data_len;
+ nd_uint32_t rip_seq_num;
+ nd_byte rip_mbz1[4];
+ nd_byte rip_mbz2[4];
+};
+
+static unsigned
+rip_entry_print_v1(netdissect_options *ndo, const u_char *p,
+ unsigned remaining)
+{
+ const struct rip_entry_header *eh = (const struct rip_entry_header *)p;
+ u_short family;
+ const struct rip_netinfo_v1 *ni = (const struct rip_netinfo_v1 *)p;
+
+ /* RFC 1058 */
+ if (remaining < RIP_ROUTELEN)
+ return (0);
+ ND_TCHECK_SIZE(ni);
+ family = GET_BE_U_2(ni->rip_family);
+ if (family != BSD_AFNUM_INET && family != 0) {
+ ND_PRINT("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
+ print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh));
+ return (RIP_ROUTELEN);
+ }
+ if (GET_BE_U_2(ni->rip_mbz1) ||
+ GET_BE_U_4(ni->rip_mbz2) ||
+ GET_BE_U_4(ni->rip_mbz3)) {
+ /* MBZ fields not zero */
+ print_unknown_data(ndo, p, "\n\t ", RIP_ROUTELEN);
+ return (RIP_ROUTELEN);
+ }
+ if (family == 0) {
+ ND_PRINT("\n\t AFI 0, %s, metric: %u",
+ GET_IPADDR_STRING(ni->rip_dest),
+ GET_BE_U_4(ni->rip_metric));
+ return (RIP_ROUTELEN);
+ } /* BSD_AFNUM_INET */
+ ND_PRINT("\n\t %s, metric: %u",
+ GET_IPADDR_STRING(ni->rip_dest),
+ GET_BE_U_4(ni->rip_metric));
+ return (RIP_ROUTELEN);
+trunc:
+ return 0;
+}
+
+static unsigned
+rip_entry_print_v2(netdissect_options *ndo, const u_char *p,
+ unsigned remaining)
+{
+ const struct rip_entry_header *eh = (const struct rip_entry_header *)p;
+ u_short family;
+ const struct rip_netinfo_v2 *ni;
+
+ if (remaining < sizeof(*eh))
+ return (0);
+ ND_TCHECK_SIZE(eh);
+ family = GET_BE_U_2(eh->rip_family);
+ if (family == 0xFFFF) { /* variable-sized authentication structures */
+ uint16_t auth_type = GET_BE_U_2(eh->rip_tag);
+
+ p += sizeof(*eh);
+ remaining -= sizeof(*eh);
+ if (auth_type == 2) {
+ ND_PRINT("\n\t Simple Text Authentication data: ");
+ nd_printjnp(ndo, p, RIP_AUTHLEN);
+ } else if (auth_type == 3) {
+ const struct rip_auth_crypto_v2 *ch;
+
+ ch = (const struct rip_auth_crypto_v2 *)p;
+ ND_TCHECK_SIZE(ch);
+ if (remaining < sizeof(*ch))
+ return (0);
+ ND_PRINT("\n\t Auth header:");
+ ND_PRINT(" Packet Len %u,",
+ GET_BE_U_2(ch->rip_packet_len));
+ ND_PRINT(" Key-ID %u,", GET_U_1(ch->rip_key_id));
+ ND_PRINT(" Auth Data Len %u,",
+ GET_U_1(ch->rip_auth_data_len));
+ ND_PRINT(" SeqNo %u,", GET_BE_U_4(ch->rip_seq_num));
+ ND_PRINT(" MBZ %u,", GET_BE_U_4(ch->rip_mbz1));
+ ND_PRINT(" MBZ %u", GET_BE_U_4(ch->rip_mbz2));
+ } else if (auth_type == 1) {
+ ND_PRINT("\n\t Auth trailer:");
+ print_unknown_data(ndo, p, "\n\t ", remaining);
+ return (sizeof(*eh) + remaining); /* AT spans till the packet end */
+ } else {
+ ND_PRINT("\n\t Unknown (%u) Authentication data:",
+ auth_type);
+ print_unknown_data(ndo, p, "\n\t ", remaining);
+ return (sizeof(*eh) + remaining); /* we don't know how long this is, so we go to the packet end */
+ }
+ } else if (family != BSD_AFNUM_INET && family != 0) {
+ ND_PRINT("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
+ print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh));
+ } else { /* BSD_AFNUM_INET or AFI 0 */
+ ni = (const struct rip_netinfo_v2 *)p;
+ ND_TCHECK_SIZE(ni);
+ if (remaining < sizeof(*ni))
+ return (0);
+ ND_PRINT("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
+ tok2str(bsd_af_values, "%u", family),
+ GET_IPADDR_STRING(ni->rip_dest),
+ mask2plen(GET_BE_U_4(ni->rip_dest_mask)),
+ GET_BE_U_2(ni->rip_tag),
+ GET_BE_U_4(ni->rip_metric));
+ if (GET_BE_U_4(ni->rip_router))
+ ND_PRINT("%s", GET_IPADDR_STRING(ni->rip_router));
+ else
+ ND_PRINT("self");
+ }
+ return (RIP_ROUTELEN);
+trunc:
+ return 0;
+}
+
+void
+rip_print(netdissect_options *ndo,
+ const u_char *dat, u_int length)
+{
+ const struct rip *rp;
+ uint8_t vers, cmd;
+ const u_char *p;
+ u_int len, routecount;
+ unsigned entry_size;
+
+ ndo->ndo_protocol = "rip";
+ if (ndo->ndo_snapend < dat) {
+ nd_print_trunc(ndo);
+ return;
+ }
+ len = ND_BYTES_AVAILABLE_AFTER(dat);
+ if (len > length)
+ len = length;
+ if (len < sizeof(*rp)) {
+ nd_print_trunc(ndo);
+ return;
+ }
+ len -= sizeof(*rp);
+
+ rp = (const struct rip *)dat;
+
+ ND_TCHECK_SIZE(rp);
+ vers = GET_U_1(rp->rip_vers);
+ ND_PRINT("%sRIPv%u",
+ (ndo->ndo_vflag >= 1) ? "\n\t" : "",
+ vers);
+
+ if (vers == 0) {
+ /*
+ * RFC 1058.
+ *
+ * XXX - RFC 1058 says
+ *
+ * 0 Datagrams whose version number is zero are to be ignored.
+ * These are from a previous version of the protocol, whose
+ * packet format was machine-specific.
+ *
+ * so perhaps we should just dump the packet, in hex.
+ */
+ print_unknown_data(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length);
+ return;
+ }
+
+ /* dump version and lets see if we know the commands name*/
+ cmd = GET_U_1(rp->rip_cmd);
+ ND_PRINT(", %s, length: %u",
+ tok2str(rip_cmd_values, "unknown command (%u)", cmd),
+ length);
+
+ if (ndo->ndo_vflag < 1)
+ return;
+
+ switch (cmd) {
+
+ case RIPCMD_REQUEST:
+ case RIPCMD_RESPONSE:
+ switch (vers) {
+
+ case 1:
+ routecount = length / RIP_ROUTELEN;
+ ND_PRINT(", routes: %u", routecount);
+ p = (const u_char *)(rp + 1);
+ while (len != 0) {
+ entry_size = rip_entry_print_v1(ndo, p, len);
+ if (entry_size == 0) {
+ /* Error */
+ nd_print_trunc(ndo);
+ break;
+ }
+ if (len < entry_size) {
+ ND_PRINT(" [remaining entries length %u < %u]",
+ len, entry_size);
+ nd_print_invalid(ndo);
+ break;
+ }
+ p += entry_size;
+ len -= entry_size;
+ }
+ break;
+
+ case 2:
+ routecount = length / RIP_ROUTELEN;
+ ND_PRINT(", routes: %u or less", routecount);
+ p = (const u_char *)(rp + 1);
+ while (len != 0) {
+ entry_size = rip_entry_print_v2(ndo, p, len);
+ if (entry_size == 0) {
+ /* Error */
+ nd_print_trunc(ndo);
+ break;
+ }
+ if (len < entry_size) {
+ ND_PRINT(" [remaining entries length %u < %u]",
+ len, entry_size);
+ nd_print_invalid(ndo);
+ break;
+ }
+ p += entry_size;
+ len -= entry_size;
+ }
+ break;
+
+ default:
+ ND_PRINT(", unknown version");
+ break;
+ }
+ break;
+
+ case RIPCMD_TRACEOFF:
+ case RIPCMD_POLL:
+ case RIPCMD_POLLENTRY:
+ break;
+
+ case RIPCMD_TRACEON:
+ /* fall through */
+ default:
+ if (ndo->ndo_vflag <= 1) {
+ if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
+ return;
+ }
+ break;
+ }
+ /* do we want to see an additionally hexdump ? */
+ if (ndo->ndo_vflag> 1) {
+ if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
+ return;
+ }
+trunc:
+ return;
+}
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