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-rw-r--r--usr.sbin/rtadvd/if.c592
1 files changed, 592 insertions, 0 deletions
diff --git a/usr.sbin/rtadvd/if.c b/usr.sbin/rtadvd/if.c
new file mode 100644
index 00000000000..3488968f393
--- /dev/null
+++ b/usr.sbin/rtadvd/if.c
@@ -0,0 +1,592 @@
+/*
+ * 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.
+ */
+
+#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>
+#ifdef __FreeBSD__
+# include <net/ethernet.h>
+#endif
+#ifdef __bsdi__
+# include <ifaddrs.h>
+#endif
+#ifdef __NetBSD__
+#include <net/if_ether.h>
+#endif
+#include <net/route.h>
+#include <net/if_dl.h>
+#include <netinet/in.h>
+#include <netinet/icmp6.h>
+#ifdef __bsdi__
+# include <netinet/if_ether.h>
+#endif
+#ifdef __OpenBSD__
+#include <netinet/if_ether.h>
+#endif
+#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 (strlen(name) != sdl->sdl_nlen)
+ continue; /* not same len */
+ 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)
+{
+#if defined(__FreeBSD__) || defined(__NetBSD__)
+ 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);
+#endif
+#ifdef __bsdi__
+ struct ifaddrs *ifa;
+ struct if_data *ifd;
+
+ if (getifaddrs(&ifa) < 0)
+ return(0);
+ while (ifa) {
+ if (strcmp(ifa->ifa_name, name) == 0) {
+ ifd = ifa->ifa_data;
+ if (ifd)
+ return ifd->ifi_mtu;
+ else
+ return 0;
+ }
+ ifa = ifa->ifa_next;
+ }
+ return 0;
+#endif
+ /* last resort */
+ return 0;
+}
+
+/* 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);
+
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 08:51:27 +0000