Import mrouted version 3.9-beta3+IOS12 . This is a version of 3.9-beta3

with minor changes to work around a bug in Cisco's IOS version 12.0 .
3.9-beta3 is much improved over 3.8, and is only labelled "beta" because
of missing features, as opposed to instability or known bugs.

1 files changed, 225 insertions, 0 deletions

diff --git a/usr.sbin/mrouted/icmp.c b/usr.sbin/mrouted/icmp.c
new file mode 100644
index 0000000..72efa0a
--- /dev/null
+++ b/usr.sbin/mrouted/icmp.c
@@ -0,0 +1,225 @@
+/*
+ * The mrouted program is covered by the license in the accompanying file
+ * named "LICENSE".  Use of the mrouted program represents acceptance of
+ * the terms and conditions listed in that file.
+ *
+ * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
+ * Leland Stanford Junior University.
+ *
+ *
+ * icmp.c,v 3.8.4.2 1998/01/06 01:57:42 fenner Exp
+ */
+
+#include "defs.h"
+
+#ifndef lint
+static char rcsid[] = "@(#) $Id: \
+icmp.c,v 3.8.4.2 1998/01/06 01:57:42 fenner Exp $";
+#endif
+
+static int	icmp_socket;
+
+static void	icmp_handler __P((int, fd_set *));
+static char *	icmp_name __P((struct icmp *));
+
+void
+init_icmp()
+{
+    if ((icmp_socket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)) < 0)
+	log(LOG_ERR, errno, "ICMP socket");
+
+    register_input_handler(icmp_socket, icmp_handler);
+
+    IF_DEBUG(DEBUG_ICMP)
+    log(LOG_DEBUG, 0, "registering icmp socket fd %d\n", icmp_socket);
+}
+
+static void
+icmp_handler(fd, rfds)
+    int fd;
+    fd_set *rfds;
+{
+    u_char icmp_buf[RECV_BUF_SIZE];
+    struct sockaddr_in from;
+    int fromlen, recvlen, iphdrlen, ipdatalen;
+    struct icmp *icmp;
+    struct ip *ip;
+    vifi_t i;
+    struct uvif *v;
+    u_int32 src;
+
+    fromlen = sizeof(from);
+    recvlen = recvfrom(icmp_socket, icmp_buf, RECV_BUF_SIZE, 0,
+			    (struct sockaddr *)&from, &fromlen);
+    if (recvlen < 0) {
+	if (errno != EINTR)
+	    log(LOG_WARNING, errno, "icmp_socket recvfrom");
+	return;
+    }
+    ip = (struct ip *)icmp_buf;
+    iphdrlen = ip->ip_hl << 2;
+#ifdef RAW_INPUT_IS_RAW
+    ipdatalen = ntohs(ip->ip_len) - iphdrlen;
+#else
+    ipdatalen = ip->ip_len;
+#endif
+    if (iphdrlen + ipdatalen != recvlen) {
+	IF_DEBUG(DEBUG_ICMP)
+	log(LOG_DEBUG, 0, "hdr %d data %d != rcv %d", iphdrlen, ipdatalen, recvlen);
+	/* Malformed ICMP, just return. */
+	return;
+    }
+    if (ipdatalen < ICMP_MINLEN + sizeof(struct ip)) {
+	/* Not enough data for us to be interested in it. */
+	return;
+    }
+    src = ip->ip_src.s_addr;
+    icmp = (struct icmp *)(icmp_buf + iphdrlen);
+    IF_DEBUG(DEBUG_ICMP)
+    log(LOG_DEBUG, 0, "got ICMP type %d from %s",
+	icmp->icmp_type, inet_fmt(src, s1));
+    /*
+     * Eventually:
+     * have registry of ICMP listeners, by type, code and ICMP_ID
+     * (and maybe fields of the original packet too -- maybe need a
+     * generalized packet filter!) to allow ping and traceroute
+     * from the monitoring tool.
+     */
+    switch (icmp->icmp_type) {
+	case ICMP_UNREACH:
+	case ICMP_TIMXCEED:
+	    /* Look at returned packet to see if it's us sending on a tunnel */
+	    ip = &icmp->icmp_ip;
+	    if (ip->ip_p != IPPROTO_IGMP && ip->ip_p != IPPROTO_IPIP)
+		return;
+	    for (v = uvifs, i = 0; i < numvifs; v++, i++) {
+		if (ip->ip_src.s_addr == v->uv_lcl_addr &&
+		    ip->ip_dst.s_addr == v->uv_dst_addr) {
+		    char *p;
+		    int n;
+		    /*
+		     * I sent this packet on this vif.
+		     */
+		    n = ++v->uv_icmp_warn;
+		    while (n && !(n & 1))
+			n >>= 1;
+		    if (n == 1 && ((p = icmp_name(icmp)) != NULL))
+			log(LOG_WARNING, 0, "Received ICMP %s from %s %s %s on vif %d",
+			    p, inet_fmt(src, s1), "for traffic sent to",
+			    inet_fmt(ip->ip_dst.s_addr, s2),
+			    i);
+
+		    break;
+		}
+	    }
+	    break;
+    }
+}
+
+/*
+ * Return NULL for ICMP informational messages.
+ * Return string describing the error for ICMP errors.
+ */
+static char *
+icmp_name(icmp)
+    struct icmp *icmp;
+{
+    static char retval[30];
+
+    switch (icmp->icmp_type) {
+	case ICMP_UNREACH:
+	    switch (icmp->icmp_code) {
+		case ICMP_UNREACH_NET:
+		    return "network unreachable";
+		case ICMP_UNREACH_HOST:
+		    return "host unreachable";
+		case ICMP_UNREACH_PROTOCOL:
+		    return "protocol unreachable";
+		case ICMP_UNREACH_PORT:
+		    return "port unreachable";
+		case ICMP_UNREACH_NEEDFRAG:
+		    return "needs fragmentation";
+		case ICMP_UNREACH_SRCFAIL:
+		    return "source route failed";
+#ifndef ICMP_UNREACH_NET_UNKNOWN
+#define ICMP_UNREACH_NET_UNKNOWN	6
+#endif
+		case ICMP_UNREACH_NET_UNKNOWN:
+		    return "network unknown";
+#ifndef ICMP_UNREACH_HOST_UNKNOWN
+#define ICMP_UNREACH_HOST_UNKNOWN	7
+#endif
+		case ICMP_UNREACH_HOST_UNKNOWN:
+		    return "host unknown";
+#ifndef ICMP_UNREACH_ISOLATED
+#define ICMP_UNREACH_ISOLATED		8
+#endif
+		case ICMP_UNREACH_ISOLATED:
+		    return "source host isolated";
+#ifndef ICMP_UNREACH_NET_PROHIB
+#define ICMP_UNREACH_NET_PROHIB		9
+#endif
+		case ICMP_UNREACH_NET_PROHIB:
+		    return "network access prohibited";
+#ifndef ICMP_UNREACH_HOST_PROHIB
+#define ICMP_UNREACH_HOST_PROHIB	10
+#endif
+		case ICMP_UNREACH_HOST_PROHIB:
+		    return "host access prohibited";
+#ifndef ICMP_UNREACH_TOSNET
+#define ICMP_UNREACH_TOSNET		11
+#endif
+		case ICMP_UNREACH_TOSNET:
+		    return "bad TOS for net";
+#ifndef ICMP_UNREACH_TOSHOST
+#define ICMP_UNREACH_TOSHOST		12
+#endif
+		case ICMP_UNREACH_TOSHOST:
+		    return "bad TOS for host";
+#ifndef ICMP_UNREACH_FILTER_PROHIB
+#define ICMP_UNREACH_FILTER_PROHIB	13
+#endif
+		case ICMP_UNREACH_FILTER_PROHIB:
+		    return "prohibited by filter";
+#ifndef ICMP_UNREACH_HOST_PRECEDENCE
+#define ICMP_UNREACH_HOST_PRECEDENCE	14
+#endif
+		case ICMP_UNREACH_HOST_PRECEDENCE:
+		    return "host precedence violation";
+#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
+#define ICMP_UNREACH_PRECEDENCE_CUTOFF	15
+#endif
+		case ICMP_UNREACH_PRECEDENCE_CUTOFF:
+		    return "precedence cutoff";
+		default:
+		    sprintf(retval, "unreachable code %d", icmp->icmp_code);
+		    return retval;
+	    }
+	case ICMP_SOURCEQUENCH:
+	    return "source quench";
+	case ICMP_REDIRECT:
+	    return NULL;	/* XXX */
+	case ICMP_TIMXCEED:
+	    switch (icmp->icmp_code) {
+		case ICMP_TIMXCEED_INTRANS:
+		    return "time exceeded in transit";
+		case ICMP_TIMXCEED_REASS:
+		    return "time exceeded in reassembly";
+		default:
+		    sprintf(retval, "time exceeded code %d", icmp->icmp_code);
+		    return retval;
+	    }
+	case ICMP_PARAMPROB:
+	    switch (icmp->icmp_code) {
+#ifndef ICMP_PARAMPROB_OPTABSENT
+#define ICMP_PARAMPROB_OPTABSENT	1
+#endif
+		case ICMP_PARAMPROB_OPTABSENT:
+		    return "required option absent";
+		default:
+		    sprintf(retval, "parameter problem code %d", icmp->icmp_code);
+		    return retval;
+	    }
+    }
+    return NULL;
+}