/* \summary: IPv6 Routing Information Protocol (RIPng) printer */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* specification: RFC 2080 */
-#include <netdissect-stdinc.h>
+#include <config.h>
+
+#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "addrtoname.h"
#define RIP6_RESPONSE 2
struct netinfo6 {
- struct in6_addr rip6_dest;
- uint16_t rip6_tag;
- uint8_t rip6_plen;
- uint8_t rip6_metric;
+ nd_ipv6 rip6_dest;
+ nd_uint16_t rip6_tag;
+ nd_uint8_t rip6_plen;
+ nd_uint8_t rip6_metric;
};
struct rip6 {
- uint8_t rip6_cmd;
- uint8_t rip6_vers;
- uint8_t rip6_res1[2];
- union {
- struct netinfo6 ru6_nets[1];
- char ru6_tracefile[1];
- } rip6un;
-#define rip6_nets rip6un.ru6_nets
-#define rip6_tracefile rip6un.ru6_tracefile
+ nd_uint8_t rip6_cmd;
+ nd_uint8_t rip6_vers;
+ nd_byte rip6_res1[2];
+ struct netinfo6 rip6_nets[1];
};
#define HOPCNT_INFINITY6 16
-#if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
-static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
+static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
{
- static const struct in6_addr in6addr_any; /* :: */
- return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
+ static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */
+ return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
}
-#endif
-static int
-rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric)
+static void
+rip6_entry_print(netdissect_options *ndo,
+ const struct netinfo6 *ni, const u_int print_metric)
{
- int l;
- l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen));
- if (ni->rip6_tag)
- l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag)));
- if (metric)
- l += ND_PRINT((ndo, " (%d)", ni->rip6_metric));
- return l;
+ uint16_t tag;
+ uint8_t metric;
+
+ ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest),
+ GET_U_1(ni->rip6_plen));
+ tag = GET_BE_U_2(ni->rip6_tag);
+ if (tag)
+ ND_PRINT(" [%u]", tag);
+ metric = GET_U_1(ni->rip6_metric);
+ if (metric && print_metric)
+ ND_PRINT(" (%u)", metric);
}
void
ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
{
- register const struct rip6 *rp = (const struct rip6 *)dat;
- register const struct netinfo6 *ni;
- register u_int amt;
- register u_int i;
- int j;
- int trunc;
-
- if (ndo->ndo_snapend < dat)
- return;
- amt = ndo->ndo_snapend - dat;
- i = min(length, amt);
- if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
- return;
- i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
-
- switch (rp->rip6_cmd) {
+ const struct rip6 *rp = (const struct rip6 *)dat;
+ uint8_t cmd, vers;
+ const struct netinfo6 *ni;
+ unsigned int length_left;
+ u_int j;
+
+ ndo->ndo_protocol = "ripng";
+ vers = GET_U_1(rp->rip6_vers);
+ if (vers != RIP6_VERSION) {
+ nd_print_protocol(ndo);
+ ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION);
+ goto invalid;
+ }
+ cmd = GET_U_1(rp->rip6_cmd);
+ switch (cmd) {
case RIP6_REQUEST:
- j = length / sizeof(*ni);
- if (j == 1
- && rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
- && IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
- ND_PRINT((ndo, " ripng-req dump"));
- break;
+ length_left = length;
+ if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
+ goto invalid;
+ length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
+ j = length_left / sizeof(*ni);
+ if (j == 1) {
+ if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
+ && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
+ ND_PRINT(" ripng-req dump");
+ break;
+ }
}
- if (j * sizeof(*ni) != length - 4)
- ND_PRINT((ndo, " ripng-req %d[%u]:", j, length));
+ if (j * sizeof(*ni) != length_left)
+ ND_PRINT(" ripng-req %u[%u]:", j, length);
else
- ND_PRINT((ndo, " ripng-req %d:", j));
- trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
- for (ni = rp->rip6_nets; i >= sizeof(*ni);
- i -= sizeof(*ni), ++ni) {
+ ND_PRINT(" ripng-req %u:", j);
+ for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
+ length_left -= sizeof(*ni), ++ni) {
if (ndo->ndo_vflag > 1)
- ND_PRINT((ndo, "\n\t"));
+ ND_PRINT("\n\t");
else
- ND_PRINT((ndo, " "));
- rip6_entry_print(ndo, ni, 0);
+ ND_PRINT(" ");
+ rip6_entry_print(ndo, ni, FALSE);
}
+ if (length_left != 0)
+ goto invalid;
break;
case RIP6_RESPONSE:
- j = length / sizeof(*ni);
- if (j * sizeof(*ni) != length - 4)
- ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length));
+ length_left = length;
+ if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
+ goto invalid;
+ length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
+ j = length_left / sizeof(*ni);
+ if (j * sizeof(*ni) != length_left)
+ ND_PRINT(" ripng-resp %u[%u]:", j, length);
else
- ND_PRINT((ndo, " ripng-resp %d:", j));
- trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
- for (ni = rp->rip6_nets; i >= sizeof(*ni);
- i -= sizeof(*ni), ++ni) {
+ ND_PRINT(" ripng-resp %u:", j);
+ for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
+ length_left -= sizeof(*ni), ++ni) {
if (ndo->ndo_vflag > 1)
- ND_PRINT((ndo, "\n\t"));
+ ND_PRINT("\n\t");
else
- ND_PRINT((ndo, " "));
- rip6_entry_print(ndo, ni, ni->rip6_metric);
+ ND_PRINT(" ");
+ rip6_entry_print(ndo, ni, TRUE);
}
- if (trunc)
- ND_PRINT((ndo, "[|ripng]"));
+ if (length_left != 0)
+ goto invalid;
break;
default:
- ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length));
- break;
+ ND_PRINT(" ripng-%u ?? %u", cmd, length);
+ goto invalid;
}
- if (rp->rip6_vers != RIP6_VERSION)
- ND_PRINT((ndo, " [vers %d]", rp->rip6_vers));
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
}
projects / tcpdump / blobdiff