if.c revision 66776
166776Skris/* $KAME$ */ 266776Skris 355163Sshin/* 455163Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 555163Sshin * All rights reserved. 662632Skris * 755163Sshin * Redistribution and use in source and binary forms, with or without 855163Sshin * modification, are permitted provided that the following conditions 955163Sshin * are met: 1055163Sshin * 1. Redistributions of source code must retain the above copyright 1155163Sshin * notice, this list of conditions and the following disclaimer. 1255163Sshin * 2. Redistributions in binary form must reproduce the above copyright 1355163Sshin * notice, this list of conditions and the following disclaimer in the 1455163Sshin * documentation and/or other materials provided with the distribution. 1555163Sshin * 3. Neither the name of the project nor the names of its contributors 1655163Sshin * may be used to endorse or promote products derived from this software 1755163Sshin * without specific prior written permission. 1862632Skris * 1955163Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2055163Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2155163Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2255163Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2355163Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2455163Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2555163Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2655163Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2755163Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2855163Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2955163Sshin * SUCH DAMAGE. 3055163Sshin * 3155163Sshin * $FreeBSD: head/usr.sbin/rtsold/if.c 66776 2000-10-06 23:46:52Z kris $ 3255163Sshin */ 3355163Sshin 3455163Sshin#include <sys/param.h> 3555163Sshin#include <sys/socket.h> 3655163Sshin#include <sys/sysctl.h> 3755163Sshin#include <sys/ioctl.h> 3866776Skris#include <sys/queue.h> 3955163Sshin 4055163Sshin#include <net/if.h> 4162632Skris#if defined(__FreeBSD__) && __FreeBSD__ >= 3 4255163Sshin#include <net/if_var.h> 4362632Skris#endif /* __FreeBSD__ >= 3 */ 4455163Sshin#include <net/if_types.h> 4555163Sshin#include <net/route.h> 4655163Sshin#include <net/if_dl.h> 4755163Sshin#include <net/if_media.h> 4862632Skris#ifdef __FreeBSD__ 4962632Skris# include <net/ethernet.h> 5062632Skris#endif 5162632Skris#ifdef __NetBSD__ 5262632Skris#include <net/if_ether.h> 5362632Skris#endif 5462632Skris#if defined(__bsdi__) || defined(__OpenBSD__) 5562632Skris# include <netinet/in.h> 5662632Skris# include <netinet/if_ether.h> 5762632Skris#endif 5855163Sshin#include <netinet/in.h> 5955163Sshin#include <netinet/icmp6.h> 6055163Sshin 6155163Sshin#include <netinet6/in6_var.h> 6255163Sshin 6355163Sshin#include <stdio.h> 6455163Sshin#include <unistd.h> 6555163Sshin#include <stdlib.h> 6655163Sshin#include <syslog.h> 6755163Sshin#include <string.h> 6855163Sshin#include <fcntl.h> 6955163Sshin#include <errno.h> 7055163Sshin#include <limits.h> 7162632Skris#ifdef HAVE_GETIFADDRS 7262632Skris#include <ifaddrs.h> 7362632Skris#endif 7455163Sshin 7555163Sshin#include "rtsold.h" 7655163Sshin 7762632Skrisextern int rssock; 7855163Sshinstatic int ifsock; 7955163Sshin 8062632Skrisstatic int get_llflag __P((const char *name)); 8162632Skris#ifndef HAVE_GETIFADDRS 8262632Skrisstatic unsigned int if_maxindex __P((void)); 8362632Skris#endif 8455163Sshinstatic void get_rtaddrs __P((int addrs, struct sockaddr *sa, 8555163Sshin struct sockaddr **rti_info)); 8655163Sshin 8755163Sshinint 8855163Sshinifinit() 8955163Sshin{ 9062632Skris ifsock = rssock; 9155163Sshin 9255163Sshin return(0); 9355163Sshin} 9455163Sshin 9555163Sshinint 9655163Sshininterface_up(char *name) 9755163Sshin{ 9855163Sshin struct ifreq ifr; 9962632Skris int llflag; 10055163Sshin 10155163Sshin strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 10255163Sshin 10355163Sshin if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) { 10455163Sshin warnmsg(LOG_WARNING, __FUNCTION__, "ioctl(SIOCGIFFLAGS): %s", 10555163Sshin strerror(errno)); 10655163Sshin return(-1); 10755163Sshin } 10855163Sshin if (!(ifr.ifr_flags & IFF_UP)) { 10955163Sshin ifr.ifr_flags |= IFF_UP; 11055163Sshin if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) { 11155163Sshin warnmsg(LOG_ERR, __FUNCTION__, 11255163Sshin "ioctl(SIOCSIFFLAGS): %s", strerror(errno)); 11355163Sshin } 11455163Sshin return(-1); 11555163Sshin } 11655163Sshin 11755163Sshin warnmsg(LOG_DEBUG, __FUNCTION__, "checking if %s is ready...", name); 11855163Sshin 11962632Skris llflag = get_llflag(name); 12062632Skris if (llflag < 0) { 12155163Sshin warnmsg(LOG_WARNING, __FUNCTION__, 12262632Skris "get_llflag() failed, anyway I'll try"); 12355163Sshin return 0; 12455163Sshin } 12555163Sshin 12662632Skris if (!(llflag & IN6_IFF_NOTREADY)) { 12755163Sshin warnmsg(LOG_DEBUG, __FUNCTION__, 12855163Sshin "%s is ready", name); 12955163Sshin return(0); 13062632Skris } else { 13162632Skris if (llflag & IN6_IFF_TENTATIVE) { 13255163Sshin warnmsg(LOG_DEBUG, __FUNCTION__, "%s is tentative", 13355163Sshin name); 13455163Sshin return IFS_TENTATIVE; 13555163Sshin } 13662632Skris if (llflag & IN6_IFF_DUPLICATED) 13755163Sshin warnmsg(LOG_DEBUG, __FUNCTION__, "%s is duplicated", 13855163Sshin name); 13955163Sshin return -1; 14055163Sshin } 14155163Sshin} 14255163Sshin 14355163Sshinint 14455163Sshininterface_status(struct ifinfo *ifinfo) 14555163Sshin{ 14655163Sshin char *ifname = ifinfo->ifname; 14755163Sshin struct ifreq ifr; 14855163Sshin struct ifmediareq ifmr; 14962632Skris 15055163Sshin /* get interface flags */ 15155163Sshin memset(&ifr, 0, sizeof(ifr)); 15255163Sshin strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 15355163Sshin if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) { 15455163Sshin warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFFLAGS) on %s: %s", 15555163Sshin ifname, strerror(errno)); 15655163Sshin return(-1); 15755163Sshin } 15855163Sshin /* 15955163Sshin * if one of UP and RUNNING flags is dropped, 16055163Sshin * the interface is not active. 16155163Sshin */ 16255163Sshin if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 16355163Sshin goto inactive; 16455163Sshin } 16555163Sshin 16655163Sshin /* Next, check carrier on the interface, if possible */ 16755163Sshin if (!ifinfo->mediareqok) 16855163Sshin goto active; 16955163Sshin memset(&ifmr, 0, sizeof(ifmr)); 17055163Sshin strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); 17155163Sshin 17255163Sshin if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) { 17355163Sshin if (errno != EINVAL) { 17455163Sshin warnmsg(LOG_DEBUG, __FUNCTION__, 17555163Sshin "ioctl(SIOCGIFMEDIA) on %s: %s", 17655163Sshin ifname, strerror(errno)); 17755163Sshin return(-1); 17855163Sshin } 17955163Sshin /* 18055163Sshin * EINVAL simply means that the interface does not support 18155163Sshin * the SIOCGIFMEDIA ioctl. We regard it alive. 18255163Sshin */ 18355163Sshin ifinfo->mediareqok = 0; 18455163Sshin goto active; 18555163Sshin } 18655163Sshin 18755163Sshin if (ifmr.ifm_status & IFM_AVALID) { 18855163Sshin switch(ifmr.ifm_active & IFM_NMASK) { 18955163Sshin case IFM_ETHER: 19055163Sshin if (ifmr.ifm_status & IFM_ACTIVE) 19155163Sshin goto active; 19255163Sshin else 19355163Sshin goto inactive; 19455163Sshin break; 19555163Sshin default: 19655163Sshin goto inactive; 19755163Sshin } 19855163Sshin } 19955163Sshin 20055163Sshin inactive: 20155163Sshin return(0); 20255163Sshin 20355163Sshin active: 20455163Sshin return(1); 20555163Sshin} 20655163Sshin 20762632Skris#define ROUNDUP(a, size) \ 20855163Sshin (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 20955163Sshin 21062632Skris#define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 21155163Sshin ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\ 21255163Sshin sizeof(u_long)) :\ 21355163Sshin sizeof(u_long))) 21462632Skris#define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 21555163Sshin 21655163Sshinint 21755163Sshinlladdropt_length(struct sockaddr_dl *sdl) 21855163Sshin{ 21955163Sshin switch(sdl->sdl_type) { 22055163Sshin case IFT_ETHER: 22155163Sshin return(ROUNDUP8(ETHER_ADDR_LEN + 2)); 22255163Sshin default: 22355163Sshin return(0); 22455163Sshin } 22555163Sshin} 22655163Sshin 22755163Sshinvoid 22855163Sshinlladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 22955163Sshin{ 23055163Sshin char *addr; 23155163Sshin 23255163Sshin ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 23355163Sshin 23455163Sshin switch(sdl->sdl_type) { 23555163Sshin case IFT_ETHER: 23655163Sshin ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 23755163Sshin addr = (char *)(ndopt + 1); 23855163Sshin memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 23955163Sshin break; 24055163Sshin default: 24155163Sshin warnmsg(LOG_ERR, __FUNCTION__, 24255163Sshin "unsupported link type(%d)", sdl->sdl_type); 24355163Sshin exit(1); 24455163Sshin } 24555163Sshin 24655163Sshin return; 24755163Sshin} 24855163Sshin 24955163Sshinstruct sockaddr_dl * 25055163Sshinif_nametosdl(char *name) 25155163Sshin{ 25255163Sshin int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0}; 25355163Sshin char *buf, *next, *lim; 25455163Sshin size_t len; 25555163Sshin struct if_msghdr *ifm; 25655163Sshin struct sockaddr *sa, *rti_info[RTAX_MAX]; 25755163Sshin struct sockaddr_dl *sdl = NULL, *ret_sdl; 25855163Sshin 25955163Sshin if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 26055163Sshin return(NULL); 26155163Sshin if ((buf = malloc(len)) == NULL) 26255163Sshin return(NULL); 26355163Sshin if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { 26455163Sshin free(buf); 26555163Sshin return(NULL); 26655163Sshin } 26755163Sshin 26855163Sshin lim = buf + len; 26955163Sshin for (next = buf; next < lim; next += ifm->ifm_msglen) { 27055163Sshin ifm = (struct if_msghdr *)next; 27155163Sshin if (ifm->ifm_type == RTM_IFINFO) { 27255163Sshin sa = (struct sockaddr *)(ifm + 1); 27355163Sshin get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 27455163Sshin if ((sa = rti_info[RTAX_IFP]) != NULL) { 27555163Sshin if (sa->sa_family == AF_LINK) { 27655163Sshin sdl = (struct sockaddr_dl *)sa; 27762632Skris if (strlen(name) != sdl->sdl_nlen) 27862632Skris continue; /* not same len */ 27955163Sshin if (strncmp(&sdl->sdl_data[0], 28055163Sshin name, 28155163Sshin sdl->sdl_nlen) == 0) { 28255163Sshin break; 28355163Sshin } 28455163Sshin } 28555163Sshin } 28655163Sshin } 28755163Sshin } 28855163Sshin if (next == lim) { 28955163Sshin /* search failed */ 29055163Sshin free(buf); 29155163Sshin return(NULL); 29255163Sshin } 29355163Sshin 29455163Sshin if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) 29555163Sshin return(NULL); 29655163Sshin memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len); 29755163Sshin 29855163Sshin return(ret_sdl); 29955163Sshin} 30055163Sshin 30155163Sshinint 30255163Sshingetinet6sysctl(int code) 30355163Sshin{ 30455163Sshin int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 30555163Sshin int value; 30655163Sshin size_t size; 30755163Sshin 30855163Sshin mib[3] = code; 30955163Sshin size = sizeof(value); 31055163Sshin if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0) 31155163Sshin return -1; 31255163Sshin else 31355163Sshin return value; 31455163Sshin} 31555163Sshin 31655163Sshin/*------------------------------------------------------------*/ 31755163Sshin 31862632Skris/* get ia6_flags for link-local addr on if. returns -1 on error. */ 31955163Sshinstatic int 32062632Skrisget_llflag(const char *name) 32155163Sshin{ 32262632Skris#ifdef HAVE_GETIFADDRS 32362632Skris struct ifaddrs *ifap, *ifa; 32462632Skris struct in6_ifreq ifr6; 32562632Skris struct sockaddr_in6 *sin6; 32662632Skris int s; 32755163Sshin 32862632Skris if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 32962632Skris warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s", 33062632Skris strerror(errno)); 33155163Sshin exit(1); 33255163Sshin } 33362632Skris if (getifaddrs(&ifap) != 0) { 33462632Skris warnmsg(LOG_ERR, __FUNCTION__, "etifaddrs: %s", 33562632Skris strerror(errno)); 33662632Skris exit(1); 33755163Sshin } 33862632Skris 33962632Skris for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 34062632Skris if (strlen(ifa->ifa_name) != strlen(name) 34162632Skris || strncmp(ifa->ifa_name, name, strlen(name)) != 0) 34262632Skris continue; 34362632Skris if (ifa->ifa_addr->sa_family != AF_INET6) 34462632Skris continue; 34562632Skris sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 34662632Skris if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 34762632Skris continue; 34862632Skris 34962632Skris memset(&ifr6, 0, sizeof(ifr6)); 35062632Skris strcpy(ifr6.ifr_name, name); 35162632Skris memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 35262632Skris if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 35362632Skris warnmsg(LOG_ERR, __FUNCTION__, 35462632Skris "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 35562632Skris exit(1); 35662632Skris } 35762632Skris 35862632Skris freeifaddrs(ifap); 35962632Skris close(s); 36062632Skris return ifr6.ifr_ifru.ifru_flags6; 36155163Sshin } 36262632Skris 36362632Skris freeifaddrs(ifap); 36462632Skris close(s); 36562632Skris return -1; 36662632Skris#else 36762632Skris int s; 36862632Skris unsigned int maxif; 36962632Skris struct ifreq *iflist; 37062632Skris struct ifconf ifconf; 37162632Skris struct ifreq *ifr, *ifr_end; 37262632Skris struct sockaddr_in6 *sin6; 37362632Skris struct in6_ifreq ifr6; 37462632Skris 37562632Skris maxif = if_maxindex() + 1; 37662632Skris iflist = (struct ifreq *)malloc(maxif * BUFSIZ); /* XXX */ 37762632Skris if (iflist == NULL) { 37862632Skris warnmsg(LOG_ERR, __FUNCTION__, "not enough core"); 37962632Skris exit(1); 38055163Sshin } 38155163Sshin 38262632Skris if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 38362632Skris warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s", 38462632Skris strerror(errno)); 38562632Skris exit(1); 38655163Sshin } 38762632Skris memset(&ifconf, 0, sizeof(ifconf)); 38862632Skris ifconf.ifc_req = iflist; 38962632Skris ifconf.ifc_len = maxif * BUFSIZ; /* XXX */ 39062632Skris if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) { 39162632Skris warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFCONF): %s", 39262632Skris strerror(errno)); 39362632Skris exit(1); 39455163Sshin } 39555163Sshin 39662632Skris /* Look for this interface in the list */ 39762632Skris ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len); 39862632Skris for (ifr = ifconf.ifc_req; 39962632Skris ifr < ifr_end; 40062632Skris ifr = (struct ifreq *) ((char *) &ifr->ifr_addr 40162632Skris + ifr->ifr_addr.sa_len)) { 40262632Skris if (strlen(ifr->ifr_name) != strlen(name) 40362632Skris || strncmp(ifr->ifr_name, name, strlen(name)) != 0) 40462632Skris continue; 40562632Skris if (ifr->ifr_addr.sa_family != AF_INET6) 40662632Skris continue; 40762632Skris sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr; 40862632Skris if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 40962632Skris continue; 41062632Skris 41162632Skris memset(&ifr6, 0, sizeof(ifr6)); 41262632Skris strcpy(ifr6.ifr_name, name); 41362632Skris memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 41462632Skris if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 41562632Skris warnmsg(LOG_ERR, __FUNCTION__, 41662632Skris "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 41762632Skris exit(1); 41855163Sshin } 41955163Sshin 42062632Skris free(iflist); 42162632Skris close(s); 42262632Skris return ifr6.ifr_ifru.ifru_flags6; 42355163Sshin } 42455163Sshin 42562632Skris free(iflist); 42662632Skris close(s); 42755163Sshin return -1; 42862632Skris#endif 42955163Sshin} 43055163Sshin 43162632Skris#ifndef HAVE_GETIFADDRS 43262632Skrisstatic unsigned int 43362632Skrisif_maxindex() 43462632Skris{ 43562632Skris struct if_nameindex *p, *p0; 43662632Skris unsigned int max = 0; 43762632Skris 43862632Skris p0 = if_nameindex(); 43962632Skris for (p = p0; p && p->if_index && p->if_name; p++) { 44062632Skris if (max < p->if_index) 44162632Skris max = p->if_index; 44262632Skris } 44362632Skris if_freenameindex(p0); 44462632Skris return max; 44562632Skris} 44662632Skris#endif 44762632Skris 44855163Sshinstatic void 44955163Sshinget_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 45055163Sshin{ 45155163Sshin int i; 45262632Skris 45355163Sshin for (i = 0; i < RTAX_MAX; i++) { 45455163Sshin if (addrs & (1 << i)) { 45555163Sshin rti_info[i] = sa; 45655163Sshin NEXT_SA(sa); 45755163Sshin } 45855163Sshin else 45955163Sshin rti_info[i] = NULL; 46055163Sshin } 46155163Sshin} 462