X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/21db1cb110e14773e5a36c72e1f0c92eabc98f65..cbd4cbb99cf9e68c67af16b5b20a050ef8819af6:/print-icmp.c diff --git a/print-icmp.c b/print-icmp.c index 2d846a96..38a9d7bd 100644 --- a/print-icmp.c +++ b/print-icmp.c @@ -21,7 +21,7 @@ #ifndef lint static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.47 2000-06-10 13:41:19 assar Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.58 2001-01-28 09:53:18 itojun Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -32,29 +32,139 @@ static const char rcsid[] = #include #include -#if __STDC__ struct mbuf; struct rtentry; -#endif -#include #include -#include -#include -#include -#include -#include -#include -#include -#include #include #include +#include /* for MAXHOSTNAMELEN on some platforms */ #include "interface.h" #include "addrtoname.h" #include "extract.h" /* must come after interface.h */ +#include "ip.h" +#include "udp.h" + +/* + * Interface Control Message Protocol Definitions. + * Per RFC 792, September 1981. + */ + +/* + * Structure of an icmp header. + */ +struct icmp { + u_int8_t icmp_type; /* type of message, see below */ + u_int8_t icmp_code; /* type sub code */ + u_int16_t icmp_cksum; /* ones complement cksum of struct */ + union { + u_int8_t ih_pptr; /* ICMP_PARAMPROB */ + struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ + struct ih_idseq { + u_int16_t icd_id; + u_int16_t icd_seq; + } ih_idseq; + u_int32_t ih_void; + + /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ + struct ih_pmtu { + u_int16_t ipm_void; + u_int16_t ipm_nextmtu; + } ih_pmtu; + } icmp_hun; +#define icmp_pptr icmp_hun.ih_pptr +#define icmp_gwaddr icmp_hun.ih_gwaddr +#define icmp_id icmp_hun.ih_idseq.icd_id +#define icmp_seq icmp_hun.ih_idseq.icd_seq +#define icmp_void icmp_hun.ih_void +#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void +#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu + union { + struct id_ts { + u_int32_t its_otime; + u_int32_t its_rtime; + u_int32_t its_ttime; + } id_ts; + struct id_ip { + struct ip idi_ip; + /* options and then 64 bits of data */ + } id_ip; + u_int32_t id_mask; + u_int8_t id_data[1]; + } icmp_dun; +#define icmp_otime icmp_dun.id_ts.its_otime +#define icmp_rtime icmp_dun.id_ts.its_rtime +#define icmp_ttime icmp_dun.id_ts.its_ttime +#define icmp_ip icmp_dun.id_ip.idi_ip +#define icmp_mask icmp_dun.id_mask +#define icmp_data icmp_dun.id_data +}; + +/* + * Lower bounds on packet lengths for various types. + * For the error advice packets must first insure that the + * packet is large enought to contain the returned ip header. + * Only then can we do the check to see if 64 bits of packet + * data have been returned, since we need to check the returned + * ip header length. + */ +#define ICMP_MINLEN 8 /* abs minimum */ +#define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */ +#define ICMP_MASKLEN 12 /* address mask */ +#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ +#define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8) + /* N.B.: must separately check that ip_hl >= 5 */ + +/* + * Definition of type and code field values. + */ +#define ICMP_ECHOREPLY 0 /* echo reply */ +#define ICMP_UNREACH 3 /* dest unreachable, codes: */ +#define ICMP_UNREACH_NET 0 /* bad net */ +#define ICMP_UNREACH_HOST 1 /* bad host */ +#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ +#define ICMP_UNREACH_PORT 3 /* bad port */ +#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ +#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ +#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ +#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ +#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ +#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ +#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ +#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ +#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ +#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ +#define ICMP_REDIRECT 5 /* shorter route, codes: */ +#define ICMP_REDIRECT_NET 0 /* for network */ +#define ICMP_REDIRECT_HOST 1 /* for host */ +#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ +#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ +#define ICMP_ECHO 8 /* echo service */ +#define ICMP_ROUTERADVERT 9 /* router advertisement */ +#define ICMP_ROUTERSOLICIT 10 /* router solicitation */ +#define ICMP_TIMXCEED 11 /* time exceeded, code: */ +#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ +#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ +#define ICMP_PARAMPROB 12 /* ip header bad */ +#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ +#define ICMP_TSTAMP 13 /* timestamp request */ +#define ICMP_TSTAMPREPLY 14 /* timestamp reply */ +#define ICMP_IREQ 15 /* information request */ +#define ICMP_IREQREPLY 16 /* information reply */ +#define ICMP_MASKREQ 17 /* address mask request */ +#define ICMP_MASKREPLY 18 /* address mask reply */ + +#define ICMP_MAXTYPE 18 + +#define ICMP_INFOTYPE(type) \ + ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ + (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ + (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ + (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ + (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) /* rfc1700 */ #ifndef ICMP_UNREACH_NET_UNKNOWN #define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */ @@ -89,14 +199,6 @@ struct rtentry; #define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */ #endif -/* rfc1256 */ -#ifndef ICMP_ROUTERADVERT -#define ICMP_ROUTERADVERT 9 /* router advertisement */ -#endif -#ifndef ICMP_ROUTERSOLICIT -#define ICMP_ROUTERSOLICIT 10 /* router solicitation */ -#endif - /* Most of the icmp types */ static struct tok icmp2str[] = { { ICMP_ECHOREPLY, "echo reply" }, @@ -149,15 +251,15 @@ static struct tok type2str[] = { /* rfc1191 */ struct mtu_discovery { - short unused; - short nexthopmtu; + u_int16_t unused; + u_int16_t nexthopmtu; }; /* rfc1256 */ struct ih_rdiscovery { - u_char ird_addrnum; - u_char ird_addrsiz; - u_short ird_lifetime; + u_int8_t ird_addrnum; + u_int8_t ird_addrsiz; + u_int16_t ird_lifetime; }; struct id_rdiscovery { @@ -175,14 +277,14 @@ icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2) register const struct ip *oip; register const struct udphdr *ouh; register u_int hlen, dport, mtu; - char buf[256]; + char buf[MAXHOSTNAMELEN + 100]; dp = (struct icmp *)bp; ip = (struct ip *)bp2; str = buf; #if 0 - (void)printf("%s > %s: ", + (void)printf("%s > %s: ", ipaddr_string(&ip->ip_src), ipaddr_string(&ip->ip_dst)); #endif @@ -205,7 +307,7 @@ icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2) case ICMP_UNREACH_PORT: TCHECK(dp->icmp_ip.ip_p); oip = &dp->icmp_ip; - hlen = oip->ip_hl * 4; + hlen = IP_HL(oip) * 4; ouh = (struct udphdr *)(((u_char *)oip) + hlen); dport = ntohs(ouh->uh_dport); switch (oip->ip_p) { @@ -237,12 +339,12 @@ icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2) { register const struct mtu_discovery *mp; mp = (struct mtu_discovery *)&dp->icmp_void; - mtu = EXTRACT_16BITS(&mp->nexthopmtu); - if (mtu) { + mtu = EXTRACT_16BITS(&mp->nexthopmtu); + if (mtu) { (void)snprintf(buf, sizeof(buf), "%s unreachable - need to frag (mtu %d)", ipaddr_string(&dp->icmp_ip.ip_dst), mtu); - } else { + } else { (void)snprintf(buf, sizeof(buf), "%s unreachable - need to frag", ipaddr_string(&dp->icmp_ip.ip_dst)); @@ -357,14 +459,16 @@ icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2) case ICMP_TSTAMP: TCHECK(dp->icmp_seq); - (void)sprintf(buf, "time stamp query id %u seq %u", + (void)snprintf(buf, sizeof(buf), + "time stamp query id %u seq %u", (unsigned)ntohs(dp->icmp_id), (unsigned)ntohs(dp->icmp_seq)); break; case ICMP_TSTAMPREPLY: TCHECK(dp->icmp_ttime); - (void)sprintf(buf, "time stamp reply id %u seq %u : org 0x%lx recv 0x%lx xmit 0x%lx", + (void)snprintf(buf, sizeof(buf), + "time stamp reply id %u seq %u : org 0x%lx recv 0x%lx xmit 0x%lx", (unsigned)ntohs(dp->icmp_id), (unsigned)ntohs(dp->icmp_seq), (unsigned long)ntohl(dp->icmp_otime), @@ -376,7 +480,7 @@ icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2) str = tok2str(icmp2str, "type-#%d", dp->icmp_type); break; } - (void)printf("icmp: %s", str); + (void)printf("icmp: %s", str); if (vflag) { if (TTEST2(*bp, plen)) { if (in_cksum((u_short*)dp, plen, 0))