1 files changed, 556 insertions, 0 deletions

diff --git a/usr.sbin/rtadvd/if.c b/usr.sbin/rtadvd/if.c
new file mode 100644
index 0000000..98aefee
--- /dev/null
+++ b/usr.sbin/rtadvd/if.c
@@ -0,0 +1,556 @@
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/ethernet.h>
+#include <net/route.h>
+#include <net/if_dl.h>
+#include <netinet/in.h>
+#include <netinet/icmp6.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include "rtadvd.h"
+#include "if.h"
+
+#define	ROUNDUP(a, size) \
+	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
+
+#define	NEXT_SA(ap) (ap) = (struct sockaddr *) \
+	((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
+						 sizeof(u_long)) :\
+			  			 sizeof(u_long)))
+
+struct	if_msghdr **iflist;
+int	iflist_init_ok;
+size_t	ifblock_size;
+char	*ifblock;
+
+static void	get_iflist __P((char **buf, size_t *size));
+static void	parse_iflist __P((struct if_msghdr ***ifmlist_p, char *buf,
+		       size_t bufsize));
+
+static void
+get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
+{
+	int i;
+
+	for (i = 0; i < RTAX_MAX; i++) {
+		if (addrs & (1 << i)) {
+			rti_info[i] = sa;
+			NEXT_SA(sa);
+		}
+		else
+			rti_info[i] = NULL;
+	}
+}
+
+struct sockaddr_dl *
+if_nametosdl(char *name)
+{
+	int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
+	char *buf, *next, *lim;
+	size_t len;
+	struct if_msghdr *ifm;
+	struct sockaddr *sa, *rti_info[RTAX_MAX];
+	struct sockaddr_dl *sdl = NULL, *ret_sdl;
+
+	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
+		return(NULL);
+	if ((buf = malloc(len)) == NULL)
+		return(NULL);
+	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
+		free(buf);
+		return(NULL);
+	}
+
+	lim = buf + len;
+	for (next = buf; next < lim; next += ifm->ifm_msglen) {
+		ifm = (struct if_msghdr *)next;
+		if (ifm->ifm_type == RTM_IFINFO) {
+			sa = (struct sockaddr *)(ifm + 1);
+			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
+			if ((sa = rti_info[RTAX_IFP]) != NULL) {
+				if (sa->sa_family == AF_LINK) {
+					sdl = (struct sockaddr_dl *)sa;
+					if (strncmp(&sdl->sdl_data[0],
+						    name,
+						    sdl->sdl_nlen) == 0) {
+						break;
+					}
+				}
+			}
+		}
+	}
+	if (next == lim) {
+		/* search failed */
+		free(buf);
+		return(NULL);
+	}
+
+	if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
+		return(NULL);
+	memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
+	return(ret_sdl);
+}
+
+int
+if_getmtu(char *name)
+{
+	struct ifreq ifr;
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
+		return(0);
+
+	ifr.ifr_addr.sa_family = AF_INET6;
+	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
+	if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) {
+		close(s);
+		return(0);
+	}
+
+	close(s);
+
+	return(ifr.ifr_mtu);
+}
+
+/* give interface index and its old flags, then new flags returned */
+int
+if_getflags(int ifindex, int oifflags)
+{
+	struct ifreq ifr;
+	int s;
+
+	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+		syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__,
+		       strerror(errno));
+		return (oifflags & ~IFF_UP);
+	}
+
+	if_indextoname(ifindex, ifr.ifr_name);
+	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
+		syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s",
+		       __FUNCTION__, ifr.ifr_name);
+		close(s);
+		return (oifflags & ~IFF_UP);
+	}
+	return (ifr.ifr_flags);
+}
+
+#define	ROUNDUP8(a) (1 + (((a) - 1) | 7))
+int
+lladdropt_length(struct sockaddr_dl *sdl)
+{
+	switch(sdl->sdl_type) {
+	 case IFT_ETHER:
+		 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
+	 default:
+		 return(0);
+	}
+}
+
+void
+lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
+{
+	char *addr;
+
+	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
+
+	switch(sdl->sdl_type) {
+	 case IFT_ETHER:
+		 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
+		 addr = (char *)(ndopt + 1);
+		 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
+		 break;
+	 default:
+		 syslog(LOG_ERR,
+			"<%s> unsupported link type(%d)",
+			__FUNCTION__, sdl->sdl_type);
+		 exit(1);
+	}
+
+	return;
+}
+
+int
+rtbuf_len()
+{
+	size_t len;
+
+	int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
+
+	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
+		return(-1);
+
+	return(len);
+}
+
+int
+get_rtinfo(char *buf, size_t *len)
+{
+	int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
+
+	if (sysctl(mib, 6, buf, len, NULL, 0) < 0)
+		return(-1);
+
+	return(0);
+}
+
+#define	FILTER_MATCH(type, filter) ((0x1 << type) & filter)
+#define	SIN6(s) ((struct sockaddr_in6 *)(s))
+#define	SDL(s) ((struct sockaddr_dl *)(s))
+char *
+get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
+{
+	struct rt_msghdr *rtm;
+	struct ifa_msghdr *ifam;
+	struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
+
+	*lenp = 0;
+	for (rtm = (struct rt_msghdr *)buf;
+	     rtm < (struct rt_msghdr *)lim;
+	     rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
+		/* just for safety */
+		if (!rtm->rtm_msglen) {
+			syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
+				"(buf=%p lim=%p rtm=%p)", __FUNCTION__,
+				buf, lim, rtm);
+			break;
+		}
+		if (FILTER_MATCH(rtm->rtm_type, filter) == 0) {
+			continue;
+		}
+
+		switch (rtm->rtm_type) {
+		case RTM_GET:
+		case RTM_ADD:
+		case RTM_DELETE:
+			/* address related checks */
+			sa = (struct sockaddr *)(rtm + 1);
+			get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
+			if ((dst = rti_info[RTAX_DST]) == NULL ||
+			    dst->sa_family != AF_INET6)
+				continue;
+
+			if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
+			    IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
+				continue;
+
+			if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
+			    gw->sa_family != AF_LINK)
+				continue;
+			if (ifindex && SDL(gw)->sdl_index != ifindex)
+				continue;
+
+			if (rti_info[RTAX_NETMASK] == NULL)
+				continue;
+
+			/* found */
+			*lenp = rtm->rtm_msglen;
+			return (char *)rtm;
+			/* NOTREACHED */
+		case RTM_NEWADDR:
+		case RTM_DELADDR:
+			ifam = (struct ifa_msghdr *)rtm;
+
+			/* address related checks */
+			sa = (struct sockaddr *)(ifam + 1);
+			get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
+			if ((ifa = rti_info[RTAX_IFA]) == NULL ||
+			    (ifa->sa_family != AF_INET &&
+			     ifa->sa_family != AF_INET6))
+				continue;
+
+			if (ifa->sa_family == AF_INET6 &&
+			    (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
+			     IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
+				continue;
+
+			if (ifindex && ifam->ifam_index != ifindex)
+				continue;
+
+			/* found */
+			*lenp = ifam->ifam_msglen;
+			return (char *)rtm;
+			/* NOTREACHED */
+		case RTM_IFINFO:
+			/* found */
+			*lenp = rtm->rtm_msglen;
+			return (char *)rtm;
+			/* NOTREACHED */
+		}
+	}
+
+	return (char *)rtm;
+}
+#undef FILTER_MATCH(type, filter)
+
+struct in6_addr *
+get_addr(char *buf)
+{
+	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
+	struct sockaddr *sa, *rti_info[RTAX_MAX];
+
+	sa = (struct sockaddr *)(rtm + 1);
+	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
+
+	return(&SIN6(rti_info[RTAX_DST])->sin6_addr);
+}
+
+int
+get_rtm_ifindex(char *buf)
+{
+	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
+	struct sockaddr *sa, *rti_info[RTAX_MAX];
+
+	sa = (struct sockaddr *)(rtm + 1);
+	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
+
+	return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
+}
+
+int
+get_ifm_ifindex(char *buf)
+{
+	struct if_msghdr *ifm = (struct if_msghdr *)buf;
+
+	return ((int)ifm->ifm_index);
+}
+
+int
+get_ifam_ifindex(char *buf)
+{
+	struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf;
+
+	return ((int)ifam->ifam_index);
+}
+
+int
+get_ifm_flags(char *buf)
+{
+	struct if_msghdr *ifm = (struct if_msghdr *)buf;
+
+	return (ifm->ifm_flags);
+}
+
+int
+get_prefixlen(char *buf)
+{
+	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
+	struct sockaddr *sa, *rti_info[RTAX_MAX];
+	int masklen;
+	u_char *p, *lim;
+
+	sa = (struct sockaddr *)(rtm + 1);
+	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
+	sa = rti_info[RTAX_NETMASK];
+
+	p = (u_char *)(&SIN6(sa)->sin6_addr);
+	lim = (u_char *)sa + sa->sa_len;
+	for (masklen = 0; p < lim; p++) {
+		switch (*p) {
+		case 0xff:
+			masklen += 8;
+			break;
+		case 0xfe:
+			masklen += 7;
+			break;
+		case 0xfc:
+			masklen += 6;
+			break;
+		case 0xf8:
+			masklen += 5;
+			break;
+		case 0xf0:
+			masklen += 4;
+			break;
+		case 0xe0:
+			masklen += 3;
+			break;
+		case 0xc0:
+			masklen += 2;
+			break;
+		case 0x80:
+			masklen += 1;
+			break;
+		case 0x00:
+			break;
+		default:
+			return(-1);
+		}
+	}
+
+	return(masklen);
+}
+
+int
+rtmsg_type(char *buf)
+{
+	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
+
+	return(rtm->rtm_type);
+}
+
+int
+rtmsg_len(char *buf)
+{
+	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
+
+	return(rtm->rtm_msglen);
+}
+
+int
+ifmsg_len(char *buf)
+{
+	struct if_msghdr *ifm = (struct if_msghdr *)buf;
+
+	return(ifm->ifm_msglen);
+}
+
+/*
+ * alloc buffer and get if_msghdrs block from kernel,
+ * and put them into the buffer
+ */
+static void
+get_iflist(char **buf, size_t *size)
+{
+	int mib[6];
+
+	mib[0] = CTL_NET;
+	mib[1] = PF_ROUTE;
+	mib[2] = 0;
+	mib[3] = AF_INET6;
+	mib[4] = NET_RT_IFLIST;
+	mib[5] = 0;
+
+	if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) {
+		syslog(LOG_ERR, "<%s> sysctl: iflist size get failed",
+		       __FUNCTION__);
+		exit(1);
+	}
+	if ((*buf = malloc(*size)) == NULL) {
+		syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__);
+		exit(1);
+	}
+	if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) {
+		syslog(LOG_ERR, "<%s> sysctl: iflist get failed",
+		       __FUNCTION__);
+		exit(1);
+	}
+	return;
+}
+
+/*
+ * alloc buffer and parse if_msghdrs block passed as arg,
+ * and init the buffer as list of pointers ot each of the if_msghdr.
+ */
+static void
+parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize)
+{
+	int iflentry_size, malloc_size;
+	struct if_msghdr *ifm;
+	struct ifa_msghdr *ifam;
+	char *lim;
+
+	/*
+	 * Estimate least size of an iflist entry, to be obtained from kernel.
+	 * Should add sizeof(sockaddr) ??
+	 */
+	iflentry_size = sizeof(struct if_msghdr);
+	/* roughly estimate max list size of pointers to each if_msghdr */
+	malloc_size = (bufsize/iflentry_size) * sizeof(size_t);
+	if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) {
+		syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__);
+		exit(1);
+	}
+
+	lim = buf + bufsize;
+	for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) {
+		if (ifm->ifm_msglen == 0) {
+			syslog(LOG_WARNING, "<%s> ifm_msglen is 0 "
+			       "(buf=%p lim=%p ifm=%p)", __FUNCTION__,
+			       buf, lim, ifm);
+			return;
+		}
+
+		if (ifm->ifm_type == RTM_IFINFO) {
+			(*ifmlist_p)[ifm->ifm_index] = ifm;
+		} else {
+			syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n"
+			       "expected %d, got %d\n msglen = %d\n"
+			       "buf:%p, ifm:%p, lim:%p\n",
+			       RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen,
+			       buf, ifm, lim);
+			exit (1);
+		}
+		for (ifam = (struct ifa_msghdr *)
+			((char *)ifm + ifm->ifm_msglen);
+		     ifam < (struct ifa_msghdr *)lim;
+		     ifam = (struct ifa_msghdr *)
+		     	((char *)ifam + ifam->ifam_msglen)) {
+			/* just for safety */
+			if (!ifam->ifam_msglen) {
+				syslog(LOG_WARNING, "<%s> ifa_msglen is 0 "
+				       "(buf=%p lim=%p ifam=%p)", __FUNCTION__,
+				       buf, lim, ifam);
+				return;
+			}
+			if (ifam->ifam_type != RTM_NEWADDR)
+				break;
+		}
+		ifm = (struct if_msghdr *)ifam;
+	}
+}
+
+void
+init_iflist()
+{
+	if (ifblock) {
+		free(ifblock);
+		ifblock_size = 0;
+	}
+	if (iflist)
+		free(iflist);
+	/* get iflist block from kernel */
+	get_iflist(&ifblock, &ifblock_size);
+
+	/* make list of pointers to each if_msghdr */
+	parse_iflist(&iflist, ifblock, ifblock_size);
+
+}