* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "ip.h"
+#include "ip6.h"
+#include "ipproto.h"
+
+#define PIMV1_TYPE_QUERY 0
+#define PIMV1_TYPE_REGISTER 1
+#define PIMV1_TYPE_REGISTER_STOP 2
+#define PIMV1_TYPE_JOIN_PRUNE 3
+#define PIMV1_TYPE_RP_REACHABILITY 4
+#define PIMV1_TYPE_ASSERT 5
+#define PIMV1_TYPE_GRAFT 6
+#define PIMV1_TYPE_GRAFT_ACK 7
+
+static const struct tok pimv1_type_str[] = {
+ { PIMV1_TYPE_QUERY, "Query" },
+ { PIMV1_TYPE_REGISTER, "Register" },
+ { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
+ { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
+ { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
+ { PIMV1_TYPE_ASSERT, "Assert" },
+ { PIMV1_TYPE_GRAFT, "Graft" },
+ { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
+ { 0, NULL }
+};
#define PIMV2_TYPE_HELLO 0
#define PIMV2_TYPE_REGISTER 1
#define PIMV2_TYPE_GRAFT_ACK 7
#define PIMV2_TYPE_CANDIDATE_RP 8
#define PIMV2_TYPE_PRUNE_REFRESH 9
+#define PIMV2_TYPE_DF_ELECTION 10
+#define PIMV2_TYPE_ECMP_REDIRECT 11
static const struct tok pimv2_type_values[] = {
{ PIMV2_TYPE_HELLO, "Hello" },
{ PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
{ PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
{ PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
+ { PIMV2_TYPE_DF_ELECTION, "DF Election" },
+ { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
{ 0, NULL}
};
*/
struct pim {
- u_int8_t pim_typever;
+ uint8_t pim_typever;
/* upper 4bit: PIM version number; 2 for PIMv2 */
/* lower 4bit: the PIM message type, currently they are:
* Hello, Register, Register-Stop, Join/Prune,
u_short pim_cksum; /* IP style check sum */
};
-static void pimv2_print(netdissect_options *, register const u_char *bp, register u_int len, u_int cksum);
+static void pimv2_print(netdissect_options *, register const u_char *bp, register u_int len, const u_char *);
static void
pimv1_join_prune_print(netdissect_options *ndo,
ND_TCHECK(bp[1]);
type = bp[1];
+ ND_PRINT((ndo, " %s", tok2str(pimv1_type_str, "[type %u]", type)));
switch (type) {
- case 0:
- ND_PRINT((ndo, " Query"));
+ case PIMV1_TYPE_QUERY:
if (ND_TTEST(bp[8])) {
switch (bp[8] >> 4) {
case 0:
}
break;
- case 1:
- ND_PRINT((ndo, " Register"));
+ case PIMV1_TYPE_REGISTER:
ND_TCHECK2(bp[8], 20); /* ip header */
ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[20]),
ipaddr_string(ndo, &bp[24])));
break;
- case 2:
- ND_PRINT((ndo, " Register-Stop"));
+ case PIMV1_TYPE_REGISTER_STOP:
ND_TCHECK2(bp[12], sizeof(struct in_addr));
ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[8]),
ipaddr_string(ndo, &bp[12])));
break;
- case 3:
- ND_PRINT((ndo, " Join/Prune"));
- if (ndo->ndo_vflag)
- pimv1_join_prune_print(ndo, &bp[8], len - 8);
- break;
- case 4:
- ND_PRINT((ndo, " RP-reachable"));
+ case PIMV1_TYPE_RP_REACHABILITY:
if (ndo->ndo_vflag) {
ND_TCHECK2(bp[22], 2);
ND_PRINT((ndo, " group %s", ipaddr_string(ndo, &bp[8])));
relts_print(ndo, EXTRACT_16BITS(&bp[22]));
}
break;
- case 5:
- ND_PRINT((ndo, " Assert"));
+ case PIMV1_TYPE_ASSERT:
ND_TCHECK2(bp[16], sizeof(struct in_addr));
ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[16]),
ipaddr_string(ndo, &bp[8])));
EXTRACT_32BITS(&bp[20]) & 0x7fffffff,
EXTRACT_32BITS(&bp[24])));
break;
- case 6:
- ND_PRINT((ndo, " Graft"));
+ case PIMV1_TYPE_JOIN_PRUNE:
+ case PIMV1_TYPE_GRAFT:
+ case PIMV1_TYPE_GRAFT_ACK:
if (ndo->ndo_vflag)
pimv1_join_prune_print(ndo, &bp[8], len - 8);
break;
- case 7:
- ND_PRINT((ndo, " Graft-ACK"));
- if (ndo->ndo_vflag)
- pimv1_join_prune_print(ndo, &bp[8], len - 8);
- break;
- case 8:
- ND_PRINT((ndo, " Mode"));
- break;
- default:
- ND_PRINT((ndo, " [type %d]", type));
- break;
}
if ((bp[4] >> 4) != 1)
ND_PRINT((ndo, " [v%d]", bp[4] >> 4));
void
pim_print(netdissect_options *ndo,
- register const u_char *bp, register u_int len, u_int cksum)
+ register const u_char *bp, register u_int len, const u_char *bp2)
{
register const u_char *ep;
- register struct pim *pim = (struct pim *)bp;
+ register const struct pim *pim = (const struct pim *)bp;
ep = (const u_char *)ndo->ndo_snapend;
if (bp >= ep)
PIM_VER(pim->pim_typever),
len,
tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever))));
- pimv2_print(ndo, bp, len, cksum);
+ pimv2_print(ndo, bp, len, bp2);
}
break;
default:
af = AF_INET;
len = sizeof(struct in_addr);
break;
-#ifdef INET6
case 2:
af = AF_INET6;
len = sizeof(struct in6_addr);
break;
-#endif
default:
return -1;
}
case sizeof(struct in_addr):
af = AF_INET;
break;
-#ifdef INET6
case sizeof(struct in6_addr):
af = AF_INET6;
break;
-#endif
default:
return -1;
break;
if (!silent)
ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp)));
}
-#ifdef INET6
else if (af == AF_INET6) {
if (!silent)
ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp)));
}
-#endif
return hdrlen + len;
case pimv2_group:
case pimv2_source:
ND_PRINT((ndo, "/%u", bp[1]));
}
}
-#ifdef INET6
else if (af == AF_INET6) {
if (!silent) {
ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp + 2)));
ND_PRINT((ndo, "/%u", bp[1]));
}
}
-#endif
if (bp[0] && !silent) {
if (at == pimv2_group) {
ND_PRINT((ndo, "(0x%02x)", bp[0]));
return -1;
}
+enum checksum_status {
+ CORRECT,
+ INCORRECT,
+ UNVERIFIED
+};
+
+static enum checksum_status
+pimv2_check_checksum(const u_char *bp, const u_char *bp2, u_int len)
+{
+ const struct ip *ip;
+ u_int cksum;
+
+ ip = (const struct ip *)bp2;
+ if (IP_V(ip) == 4) {
+ struct cksum_vec vec[1];
+
+ vec[0].ptr = bp;
+ vec[0].len = len;
+ cksum = in_cksum(vec, 1);
+ return (cksum ? INCORRECT : CORRECT);
+ } else if (IP_V(ip) == 6) {
+ const struct ip6_hdr *ip6;
+
+ ip6 = (const struct ip6_hdr *)bp2;
+ cksum = nextproto6_cksum(ip6, bp, len, len, IPPROTO_PIM);
+ return (cksum ? INCORRECT : CORRECT);
+ } else {
+ return (UNVERIFIED);
+ }
+}
+
static void
pimv2_print(netdissect_options *ndo,
- register const u_char *bp, register u_int len, u_int cksum)
+ register const u_char *bp, register u_int len, const u_char *bp2)
{
register const u_char *ep;
- register struct pim *pim = (struct pim *)bp;
+ register const struct pim *pim = (const struct pim *)bp;
int advance;
+ enum checksum_status cksum_status;
ep = (const u_char *)ndo->ndo_snapend;
if (bp >= ep)
if (EXTRACT_16BITS(&pim->pim_cksum) == 0) {
ND_PRINT((ndo, "(unverified)"));
} else {
- ND_PRINT((ndo, "(%scorrect)", ND_TTEST2(bp[0], len) && cksum ? "in" : "" ));
+ if (PIM_TYPE(pim->pim_typever) == PIMV2_TYPE_REGISTER) {
+ /*
+ * The checksum only covers the packet header,
+ * not the encapsulated packet.
+ */
+ cksum_status = pimv2_check_checksum(bp, bp2, 8);
+ if (cksum_status == INCORRECT) {
+ /*
+ * To quote RFC 4601, "For interoperability
+ * reasons, a message carrying a checksum
+ * calculated over the entire PIM Register
+ * message should also be accepted."
+ */
+ cksum_status = pimv2_check_checksum(bp, bp2, len);
+ }
+ } else {
+ /*
+ * The checksum covers the entire packet.
+ */
+ cksum_status = pimv2_check_checksum(bp, bp2, len);
+ }
+ switch (cksum_status) {
+
+ case CORRECT:
+ ND_PRINT((ndo, "(correct)"));
+ break;
+
+ case INCORRECT:
+ ND_PRINT((ndo, "(incorrect)"));
+ break;
+
+ case UNVERIFIED:
+ ND_PRINT((ndo, "(unverified)"));
+ break;
+ }
}
switch (PIM_TYPE(pim->pim_typever)) {
case PIMV2_TYPE_HELLO:
{
- u_int16_t otype, olen;
+ uint16_t otype, olen;
bp += 4;
while (bp < ep) {
ND_TCHECK2(bp[0], 4);
ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
} else {
char t_bit;
- u_int16_t lan_delay, override_interval;
+ uint16_t lan_delay, override_interval;
lan_delay = EXTRACT_16BITS(bp);
override_interval = EXTRACT_16BITS(bp+2);
t_bit = (lan_delay & 0x8000)? 1 : 0;
if (ndo->ndo_vflag > 1) {
const u_char *ptr = bp;
while (ptr < (bp+olen)) {
- int advance;
-
ND_PRINT((ndo, "\n\t "));
advance = pimv2_addr_print(ndo, ptr, pimv2_unicast, 0);
if (advance < 0) {
case PIMV2_TYPE_REGISTER:
{
- struct ip *ip;
+ const struct ip *ip;
- if (!ND_TTEST2(*(bp+4), PIMV2_REGISTER_FLAG_LEN))
- goto trunc;
+ ND_TCHECK2(*(bp + 4), PIMV2_REGISTER_FLAG_LEN);
ND_PRINT((ndo, ", Flags [ %s ]\n\t",
tok2str(pimv2_register_flag_values,
bp += 8; len -= 8;
/* encapsulated multicast packet */
- ip = (struct ip *)bp;
+ ip = (const struct ip *)bp;
switch (IP_V(ip)) {
case 0: /* Null header */
ND_PRINT((ndo, "IP-Null-header %s > %s",
case 4: /* IPv4 */
ip_print(ndo, bp, len);
break;
-#ifdef INET6
+
case 6: /* IPv6 */
ip6_print(ndo, bp, len);
break;
-#endif
+
default:
ND_PRINT((ndo, "IP ver %d", IP_V(ip)));
break;
*/
{
- u_int8_t ngroup;
- u_int16_t holdtime;
- u_int16_t njoin;
- u_int16_t nprune;
+ uint8_t ngroup;
+ uint16_t holdtime;
+ uint16_t njoin;
+ uint16_t nprune;
int i, j;
bp += 4; len -= 4;
bp += 4;
/* Fragment Tag, Hash Mask len, and BSR-priority */
- if (bp + sizeof(u_int16_t) >= ep) break;
+ if (bp + sizeof(uint16_t) >= ep) break;
ND_PRINT((ndo, " tag=%x", EXTRACT_16BITS(bp)));
- bp += sizeof(u_int16_t);
+ bp += sizeof(uint16_t);
if (bp >= ep) break;
ND_PRINT((ndo, " hashmlen=%d", bp[0]));
if (bp + 1 >= ep) break;
projects / tcpdump / blobdiff