diff options
Diffstat (limited to 'usr.sbin/rtsold/if.c')
| -rw-r--r-- | usr.sbin/rtsold/if.c | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/usr.sbin/rtsold/if.c b/usr.sbin/rtsold/if.c new file mode 100644 index 0000000..cb4b001 --- /dev/null +++ b/usr.sbin/rtsold/if.c @@ -0,0 +1,430 @@ +/* $KAME: if.c,v 1.27 2003/10/05 00:09:36 itojun Exp $ */ + +/* + * 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 <sys/queue.h> + +#include <net/if.h> +#include <net/if_types.h> +#include <net/route.h> +#include <net/if_dl.h> +#include <net/if_media.h> +#include <net/ethernet.h> +#include <netinet/in.h> +#include <netinet/icmp6.h> + +#include <netinet6/in6_var.h> +#include <netinet6/nd6.h> + +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <syslog.h> +#include <string.h> +#include <fcntl.h> +#include <errno.h> +#include <limits.h> +#include <ifaddrs.h> +#include "rtsold.h" + +static int ifsock; + +static int get_llflag(const char *); +static void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); + +int +ifinit(void) +{ + ifsock = rssock; + + return(0); +} + +int +interface_up(char *name) +{ + struct ifreq ifr; + struct in6_ndireq nd; + int llflag; + int s; + + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); + memset(&nd, 0, sizeof(nd)); + strlcpy(nd.ifname, name, sizeof(nd.ifname)); + + if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) { + warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s", + strerror(errno)); + return (-1); + } + if (!(ifr.ifr_flags & IFF_UP)) { + ifr.ifr_flags |= IFF_UP; + if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) + warnmsg(LOG_ERR, __func__, + "ioctl(SIOCSIFFLAGS): %s", strerror(errno)); + return (-1); + } + if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { + warnmsg(LOG_WARNING, __func__, "socket(AF_INET6, SOCK_DGRAM): %s", + strerror(errno)); + return (-1); + } + if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { + warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFINFO_IN6): %s", + strerror(errno)); + close(s); + return (-1); + } + + warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name); + + if (nd.ndi.flags & ND6_IFF_IFDISABLED) { + if (Fflag) { + nd.ndi.flags &= ~ND6_IFF_IFDISABLED; + if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) { + warnmsg(LOG_WARNING, __func__, + "ioctl(SIOCSIFINFO_IN6): %s", + strerror(errno)); + close(s); + return (-1); + } + } else { + warnmsg(LOG_WARNING, __func__, + "%s is disabled.", name); + close(s); + return (-1); + } + } + if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) { + if (Fflag) { + nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV; + if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) { + warnmsg(LOG_WARNING, __func__, + "ioctl(SIOCSIFINFO_IN6): %s", + strerror(errno)); + close(s); + return (-1); + } + } else { + warnmsg(LOG_WARNING, __func__, + "%s does not accept Router Advertisement.", name); + close(s); + return (-1); + } + } + close(s); + + llflag = get_llflag(name); + if (llflag < 0) { + warnmsg(LOG_WARNING, __func__, + "get_llflag() failed, anyway I'll try"); + return (0); + } + + if (!(llflag & IN6_IFF_NOTREADY)) { + warnmsg(LOG_DEBUG, __func__, "%s is ready", name); + return (0); + } else { + if (llflag & IN6_IFF_TENTATIVE) { + warnmsg(LOG_DEBUG, __func__, "%s is tentative", + name); + return (IFS_TENTATIVE); + } + if (llflag & IN6_IFF_DUPLICATED) + warnmsg(LOG_DEBUG, __func__, "%s is duplicated", + name); + return (-1); + } +} + +int +interface_status(struct ifinfo *ifinfo) +{ + char *ifname = ifinfo->ifname; + struct ifreq ifr; + struct ifmediareq ifmr; + + /* get interface flags */ + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) { + warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s", + ifname, strerror(errno)); + return (-1); + } + /* + * if one of UP and RUNNING flags is dropped, + * the interface is not active. + */ + if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) + goto inactive; + /* Next, check carrier on the interface, if possible */ + if (!ifinfo->mediareqok) + goto active; + memset(&ifmr, 0, sizeof(ifmr)); + strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); + + if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) { + if (errno != EINVAL) { + warnmsg(LOG_DEBUG, __func__, + "ioctl(SIOCGIFMEDIA) on %s: %s", + ifname, strerror(errno)); + return(-1); + } + /* + * EINVAL simply means that the interface does not support + * the SIOCGIFMEDIA ioctl. We regard it alive. + */ + ifinfo->mediareqok = 0; + goto active; + } + + if (ifmr.ifm_status & IFM_AVALID) { + switch (ifmr.ifm_active & IFM_NMASK) { + case IFM_ETHER: + case IFM_IEEE80211: + if (ifmr.ifm_status & IFM_ACTIVE) + goto active; + else + goto inactive; + break; + default: + goto inactive; + } + } + + inactive: + return (0); + + active: + return (1); +} + +#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))) +#define ROUNDUP8(a) (1 + (((a) - 1) | 7)) + +int +lladdropt_length(struct sockaddr_dl *sdl) +{ + switch (sdl->sdl_type) { + case IFT_ETHER: + case IFT_IEEE80211: + 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: + case IFT_IEEE80211: + ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; + addr = (char *)(ndopt + 1); + memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); + break; + default: + warnmsg(LOG_ERR, __func__, + "unsupported link type(%d)", sdl->sdl_type); + exit(1); + } + + return; +} + +struct sockaddr_dl * +if_nametosdl(char *name) +{ + int mib[] = {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, nitems(mib), NULL, &len, NULL, 0) < 0) + return(NULL); + if ((buf = malloc(len)) == NULL) + return(NULL); + if (sysctl(mib, nitems(mib), 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 *)(void *)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 *)(void *)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) { + free(buf); + return (NULL); + } + memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len); + + free(buf); + return (ret_sdl); +} + +int +getinet6sysctl(int code) +{ + int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; + int value; + size_t size; + + mib[3] = code; + size = sizeof(value); + if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) < 0) + return (-1); + else + return (value); +} + +int +setinet6sysctl(int code, int newval) +{ + int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; + int value; + size_t size; + + mib[3] = code; + size = sizeof(value); + if (sysctl(mib, nitems(mib), &value, &size, + &newval, sizeof(newval)) < 0) + return (-1); + else + return (value); +} + +/*------------------------------------------------------------*/ + +/* get ia6_flags for link-local addr on if. returns -1 on error. */ +static int +get_llflag(const char *name) +{ + struct ifaddrs *ifap, *ifa; + struct in6_ifreq ifr6; + struct sockaddr_in6 *sin6; + int s; + + if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { + warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s", + strerror(errno)); + exit(1); + } + if (getifaddrs(&ifap) != 0) { + warnmsg(LOG_ERR, __func__, "getifaddrs: %s", + strerror(errno)); + exit(1); + } + + for (ifa = ifap; ifa; ifa = ifa->ifa_next) { + if (strlen(ifa->ifa_name) != strlen(name) || + strncmp(ifa->ifa_name, name, strlen(name)) != 0) + continue; + if (ifa->ifa_addr->sa_family != AF_INET6) + continue; + sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr; + if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) + continue; + + memset(&ifr6, 0, sizeof(ifr6)); + strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name)); + memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); + if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { + warnmsg(LOG_ERR, __func__, + "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); + exit(1); + } + + freeifaddrs(ifap); + close(s); + return (ifr6.ifr_ifru.ifru_flags6); + } + + freeifaddrs(ifap); + close(s); + return (-1); +} + + +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; + } +} |
