/* $OpenBSD: if.c,v 1.88 2004/05/29 17:54:45 jcs Exp $ */ /* $NetBSD: if.c,v 1.35 1996/05/07 05:26:04 thorpej 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. */ /* * Copyright (c) 1980, 1986, 1993 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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. * * @(#)if.c 8.3 (Berkeley) 1/4/94 */ #include "bpfilter.h" #include "bridge.h" #include "carp.h" #include "pf.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #ifdef MROUTING #include #endif #endif #ifdef INET6 #ifndef INET #include #endif #include #include #endif #if NBPFILTER > 0 #include #endif #if NBRIDGE > 0 #include #endif #if NCARP > 0 #include #endif #if NPF > 0 #include #endif void if_attachsetup(struct ifnet *); void if_attachdomain1(struct ifnet *); int if_detach_rtdelete(struct radix_node *, void *); int ifqmaxlen = IFQ_MAXLEN; void if_detach_queues(struct ifnet *, struct ifqueue *); void if_detached_start(struct ifnet *); int if_detached_ioctl(struct ifnet *, u_long, caddr_t); int if_detached_init(struct ifnet *); void if_detached_watchdog(struct ifnet *); int if_clone_list(struct if_clonereq *); struct if_clone *if_clone_lookup(const char *, int *); void if_congestion_clear(void *); LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); int if_cloners_count; /* * Network interface utility routines. * * Routines with ifa_ifwith* names take sockaddr *'s as * parameters. */ void ifinit() { static struct timeout if_slowtim; timeout_set(&if_slowtim, if_slowtimo, &if_slowtim); if_slowtimo(&if_slowtim); } static int if_index = 0; int if_indexlim = 0; struct ifaddr **ifnet_addrs = NULL; struct ifnet **ifindex2ifnet = NULL; struct ifnet_head ifnet; struct ifnet *lo0ifp; /* * Attach an interface to the * list of "active" interfaces. */ void if_attachsetup(ifp) struct ifnet *ifp; { struct ifaddr *ifa; int wrapped = 0; if (ifindex2ifnet == 0) if_index = 1; else { while (if_index < if_indexlim && ifindex2ifnet[if_index] != NULL) { if_index++; /* * If we hit USHRT_MAX, we skip back to 1 since * there are a number of places where the value * of ifp->if_index or if_index itself is compared * to or stored in an unsigned short. By * jumping back, we won't botch those assignments * or comparisons. */ if (if_index == USHRT_MAX) { if_index = 1; /* * However, if we have to jump back to 1 * *twice* without finding an empty * slot in ifindex2ifnet[], then there * there are too many (>65535) interfaces. */ if (wrapped++) panic("too many interfaces"); } } } ifp->if_index = if_index; /* * We have some arrays that should be indexed by if_index. * since if_index will grow dynamically, they should grow too. * struct ifadd **ifnet_addrs * struct ifnet **ifindex2ifnet */ if (ifnet_addrs == 0 || ifindex2ifnet == 0 || if_index >= if_indexlim) { size_t m, n, oldlim; caddr_t q; oldlim = if_indexlim; if (if_indexlim == 0) if_indexlim = 8; while (if_index >= if_indexlim) if_indexlim <<= 1; /* grow ifnet_addrs */ m = oldlim * sizeof(ifa); n = if_indexlim * sizeof(ifa); q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); bzero(q, n); if (ifnet_addrs) { bcopy((caddr_t)ifnet_addrs, q, m); free((caddr_t)ifnet_addrs, M_IFADDR); } ifnet_addrs = (struct ifaddr **)q; /* grow ifindex2ifnet */ m = oldlim * sizeof(struct ifnet *); n = if_indexlim * sizeof(struct ifnet *); q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); bzero(q, n); if (ifindex2ifnet) { bcopy((caddr_t)ifindex2ifnet, q, m); free((caddr_t)ifindex2ifnet, M_IFADDR); } ifindex2ifnet = (struct ifnet **)q; } ifindex2ifnet[if_index] = ifp; if (ifp->if_snd.ifq_maxlen == 0) ifp->if_snd.ifq_maxlen = ifqmaxlen; #ifdef ALTQ ifp->if_snd.altq_type = 0; ifp->if_snd.altq_disc = NULL; ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; ifp->if_snd.altq_tbr = NULL; ifp->if_snd.altq_ifp = ifp; #endif if (domains) if_attachdomain1(ifp); #if NPF > 0 pfi_attach_ifnet(ifp); #endif /* Announce the interface. */ rt_ifannouncemsg(ifp, IFAN_ARRIVAL); } /* * Allocate the link level name for the specified interface. This * is an attachment helper. It must be called after ifp->if_addrlen * is initialized, which may not be the case when if_attach() is * called. */ void if_alloc_sadl(ifp) struct ifnet *ifp; { unsigned socksize, ifasize; int namelen, masklen; struct sockaddr_dl *sdl; struct ifaddr *ifa; /* * If the interface already has a link name, release it * now. This is useful for interfaces that can change * link types, and thus switch link names often. */ if (ifp->if_sadl != NULL) if_free_sadl(ifp); namelen = strlen(ifp->if_xname); #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; socksize = masklen + ifp->if_addrlen; #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) if (socksize < sizeof(*sdl)) socksize = sizeof(*sdl); socksize = ROUNDUP(socksize); ifasize = sizeof(*ifa) + 2 * socksize; ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK); bzero((caddr_t)ifa, ifasize); sdl = (struct sockaddr_dl *)(ifa + 1); sdl->sdl_len = socksize; sdl->sdl_family = AF_LINK; bcopy(ifp->if_xname, sdl->sdl_data, namelen); sdl->sdl_nlen = namelen; sdl->sdl_alen = ifp->if_addrlen; sdl->sdl_index = ifp->if_index; sdl->sdl_type = ifp->if_type; ifnet_addrs[ifp->if_index] = ifa; ifa->ifa_ifp = ifp; ifa->ifa_rtrequest = link_rtrequest; TAILQ_INSERT_HEAD(&ifp->if_addrlist, ifa, ifa_list); ifa->ifa_addr = (struct sockaddr *)sdl; ifp->if_sadl = sdl; sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); ifa->ifa_netmask = (struct sockaddr *)sdl; sdl->sdl_len = masklen; while (namelen != 0) sdl->sdl_data[--namelen] = 0xff; } /* * Free the link level name for the specified interface. This is * a detach helper. This is called from if_detach() or from * link layer type specific detach functions. */ void if_free_sadl(ifp) struct ifnet *ifp; { struct ifaddr *ifa; int s; ifa = ifnet_addrs[ifp->if_index]; if (ifa == NULL) return; s = splnet(); rtinit(ifa, RTM_DELETE, 0); #if 0 TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list); ifnet_addrs[ifp->if_index] = NULL; #endif ifp->if_sadl = NULL; splx(s); } void if_attachdomain() { struct ifnet *ifp; int s; s = splnet(); for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) if_attachdomain1(ifp); splx(s); } void if_attachdomain1(ifp) struct ifnet *ifp; { struct domain *dp; int s; s = splnet(); /* address family dependent data region */ bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); for (dp = domains; dp; dp = dp->dom_next) { if (dp->dom_ifattach) ifp->if_afdata[dp->dom_family] = (*dp->dom_ifattach)(ifp); } splx(s); } void if_attachhead(ifp) struct ifnet *ifp; { if (if_index == 0) TAILQ_INIT(&ifnet); TAILQ_INIT(&ifp->if_addrlist); ifp->if_addrhooks = malloc(sizeof(*ifp->if_addrhooks), M_TEMP, M_NOWAIT); if (ifp->if_addrhooks == NULL) panic("if_attachhead: malloc"); TAILQ_INIT(ifp->if_addrhooks); TAILQ_INSERT_HEAD(&ifnet, ifp, if_list); if_attachsetup(ifp); } void if_attach(ifp) struct ifnet *ifp; { if (if_index == 0) TAILQ_INIT(&ifnet); TAILQ_INIT(&ifp->if_addrlist); ifp->if_addrhooks = malloc(sizeof(*ifp->if_addrhooks), M_TEMP, M_NOWAIT); if (ifp->if_addrhooks == NULL) panic("if_attach: malloc"); TAILQ_INIT(ifp->if_addrhooks); TAILQ_INSERT_TAIL(&ifnet, ifp, if_list); if_attachsetup(ifp); } /* * Delete a route if it has a specific interface for output. * This function complies to the rn_walktree callback API. * * Note that deleting a RTF_CLONING route can trigger the * deletion of more entries, so we need to cancel the walk * and return EAGAIN. The caller should restart the walk * as long as EAGAIN is returned. */ int if_detach_rtdelete(rn, vifp) struct radix_node *rn; void *vifp; { struct ifnet *ifp = vifp; struct rtentry *rt = (struct rtentry *)rn; if (rt->rt_ifp == ifp) { int cloning = (rt->rt_flags & RTF_CLONING); if (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), 0, NULL) == 0 && cloning) return (EAGAIN); } /* * XXX There should be no need to check for rt_ifa belonging to this * interface, because then rt_ifp is set, right? */ return (0); } /* * Detach an interface from everything in the kernel. Also deallocate * private resources. * XXX So far only the INET protocol family has been looked over * wrt resource usage that needs to be decoupled. */ void if_detach(ifp) struct ifnet *ifp; { struct ifaddr *ifa; int i, s = splimp(); struct radix_node_head *rnh; struct domain *dp; ifp->if_flags &= ~IFF_OACTIVE; ifp->if_start = if_detached_start; ifp->if_ioctl = if_detached_ioctl; ifp->if_init = if_detached_init; ifp->if_watchdog = if_detached_watchdog; #if NPF > 0 pfi_detach_ifnet(ifp); #endif #if NBRIDGE > 0 /* Remove the interface from any bridge it is part of. */ if (ifp->if_bridge) bridge_ifdetach(ifp); #endif #if NCARP > 0 /* Remove the interface from any carp group it is a part of. */ if (ifp->if_carp) carp_ifdetach(ifp); #endif #if NBPFILTER > 0 /* If there is a bpf device attached, detach from it. */ if (ifp->if_bpf) bpfdetach(ifp); #endif #ifdef ALTQ if (ALTQ_IS_ENABLED(&ifp->if_snd)) altq_disable(&ifp->if_snd); if (ALTQ_IS_ATTACHED(&ifp->if_snd)) altq_detach(&ifp->if_snd); #endif /* * Find and remove all routes which is using this interface. * XXX Factor out into a route.c function? */ for (i = 1; i <= AF_MAX; i++) { rnh = rt_tables[i]; if (rnh) while ((*rnh->rnh_walktree)(rnh, if_detach_rtdelete, ifp) == EAGAIN) ; } #ifdef INET rti_delete(ifp); #if NETHER > 0 myip_ifp = NULL; #endif #ifdef MROUTING vif_delete(ifp); #endif #endif #ifdef INET6 in6_ifdetach(ifp); #endif /* * remove packets came from ifp, from software interrupt queues. * net/netisr_dispatch.h is not usable, as some of them use * strange queue names. */ #define IF_DETACH_QUEUES(x) \ do { \ extern struct ifqueue x; \ if_detach_queues(ifp, & x); \ } while (0) #ifdef INET IF_DETACH_QUEUES(arpintrq); IF_DETACH_QUEUES(ipintrq); #endif #ifdef INET6 IF_DETACH_QUEUES(ip6intrq); #endif #ifdef IPX IF_DETACH_QUEUES(ipxintrq); #endif #ifdef NS IF_DETACH_QUEUES(nsintrq); #endif #ifdef NETATALK IF_DETACH_QUEUES(atintrq1); IF_DETACH_QUEUES(atintrq2); #endif #ifdef ISO IF_DETACH_QUEUES(clnlintrq); #endif #ifdef CCITT IF_DETACH_QUEUES(llcintrq); #endif #ifdef NATM IF_DETACH_QUEUES(natmintrq); #endif #ifdef DECNET IF_DETACH_QUEUES(decnetintrq); #endif #undef IF_DETACH_QUEUES /* * XXX transient ifp refs? inpcb.ip_moptions.imo_multicast_ifp? * Other network stacks than INET? */ /* Remove the interface from the list of all interfaces. */ TAILQ_REMOVE(&ifnet, ifp, if_list); /* * Deallocate private resources. * XXX should consult refcnt and use IFAFREE */ for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa; ifa = TAILQ_FIRST(&ifp->if_addrlist)) { TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list); #ifdef INET if (ifa->ifa_addr->sa_family == AF_INET) TAILQ_REMOVE(&in_ifaddr, (struct in_ifaddr *)ifa, ia_list); #endif /* XXX if_free_sadl needs this */ if (ifa == ifnet_addrs[ifp->if_index]) continue; free(ifa, M_IFADDR); } if_free_sadl(ifp); free(ifnet_addrs[ifp->if_index], M_IFADDR); ifnet_addrs[ifp->if_index] = NULL; free(ifp->if_addrhooks, M_TEMP); for (dp = domains; dp; dp = dp->dom_next) { if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) (*dp->dom_ifdetach)(ifp, ifp->if_afdata[dp->dom_family]); } /* Announce that the interface is gone. */ rt_ifannouncemsg(ifp, IFAN_DEPARTURE); splx(s); } void if_detach_queues(ifp, q) struct ifnet *ifp; struct ifqueue *q; { struct mbuf *m, *prev, *next; prev = NULL; for (m = q->ifq_head; m; m = next) { next = m->m_nextpkt; #ifdef DIAGNOSTIC if ((m->m_flags & M_PKTHDR) == 0) { prev = m; continue; } #endif if (m->m_pkthdr.rcvif != ifp) { prev = m; continue; } if (prev) prev->m_nextpkt = m->m_nextpkt; else q->ifq_head = m->m_nextpkt; if (q->ifq_tail == m) q->ifq_tail = prev; q->ifq_len--; m->m_nextpkt = NULL; m_freem(m); IF_DROP(q); } } /* * Create a clone network interface. */ int if_clone_create(name) const char *name; { struct if_clone *ifc; int unit; ifc = if_clone_lookup(name, &unit); if (ifc == NULL) return (EINVAL); if (ifunit(name) != NULL) return (EEXIST); return ((*ifc->ifc_create)(ifc, unit)); } /* * Destroy a clone network interface. */ int if_clone_destroy(name) const char *name; { struct if_clone *ifc; struct ifnet *ifp; ifc = if_clone_lookup(name, NULL); if (ifc == NULL) return (EINVAL); ifp = ifunit(name); if (ifp == NULL) return (ENXIO); if (ifc->ifc_destroy == NULL) return (EOPNOTSUPP); return ((*ifc->ifc_destroy)(ifp)); } /* * Look up a network interface cloner. */ struct if_clone * if_clone_lookup(name, unitp) const char *name; int *unitp; { struct if_clone *ifc; const char *cp; int unit; /* separate interface name from unit */ for (cp = name; cp - name < IFNAMSIZ && *cp && (*cp < '0' || *cp > '9'); cp++) continue; if (cp == name || cp - name == IFNAMSIZ || !*cp) return (NULL); /* No name or unit number */ if (cp - name < IFNAMSIZ-1 && *cp == '0' && cp[1] != '\0') return (NULL); /* unit number 0 padded */ LIST_FOREACH(ifc, &if_cloners, ifc_list) { if (strlen(ifc->ifc_name) == cp - name && !strncmp(name, ifc->ifc_name, cp - name)) break; } if (ifc == NULL) return (NULL); unit = 0; while (cp - name < IFNAMSIZ && *cp) { if (*cp < '0' || *cp > '9' || unit > (INT_MAX - (*cp - '0')) / 10) { /* Bogus unit number. */ return (NULL); } unit = (unit * 10) + (*cp++ - '0'); } if (unitp != NULL) *unitp = unit; return (ifc); } /* * Register a network interface cloner. */ void if_clone_attach(ifc) struct if_clone *ifc; { LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); if_cloners_count++; #if NPF > 0 pfi_attach_clone(ifc); #endif } /* * Unregister a network interface cloner. */ void if_clone_detach(ifc) struct if_clone *ifc; { LIST_REMOVE(ifc, ifc_list); if_cloners_count--; } /* * Provide list of interface cloners to userspace. */ int if_clone_list(ifcr) struct if_clonereq *ifcr; { char outbuf[IFNAMSIZ], *dst; struct if_clone *ifc; int count, error = 0; ifcr->ifcr_total = if_cloners_count; if ((dst = ifcr->ifcr_buffer) == NULL) { /* Just asking how many there are. */ return (0); } if (ifcr->ifcr_count < 0) return (EINVAL); count = (if_cloners_count < ifcr->ifcr_count) ? if_cloners_count : ifcr->ifcr_count; for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ); error = copyout(outbuf, dst, IFNAMSIZ); if (error) break; } return (error); } /* * set queue congestion marker and register timeout to clear it */ void if_congestion(struct ifqueue *ifq) { static struct timeout to; ifq->ifq_congestion = 1; bzero(&to, sizeof(to)); timeout_set(&to, if_congestion_clear, ifq); timeout_add(&to, hz / 100); } /* * clear the congestion flag */ void if_congestion_clear(void *ifq) { ((struct ifqueue *)ifq)->ifq_congestion = 0; } /* * Locate an interface based on a complete address. */ /*ARGSUSED*/ struct ifaddr * ifa_ifwithaddr(addr) struct sockaddr *addr; { struct ifnet *ifp; struct ifaddr *ifa; #define equal(a1, a2) \ (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0) TAILQ_FOREACH(ifp, &ifnet, if_list) { TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != addr->sa_family) continue; if (equal(addr, ifa->ifa_addr)) return (ifa); if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && /* IP6 doesn't have broadcast */ ifa->ifa_broadaddr->sa_len != 0 && equal(ifa->ifa_broadaddr, addr)) return (ifa); } } return (NULL); } /* * Locate the point to point interface with a given destination address. */ /*ARGSUSED*/ struct ifaddr * ifa_ifwithdstaddr(addr) struct sockaddr *addr; { struct ifnet *ifp; struct ifaddr *ifa; TAILQ_FOREACH(ifp, &ifnet, if_list) { if (ifp->if_flags & IFF_POINTOPOINT) TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != addr->sa_family || ifa->ifa_dstaddr == NULL) continue; if (equal(addr, ifa->ifa_dstaddr)) return (ifa); } } return (NULL); } /* * Find an interface on a specific network. If many, choice * is most specific found. */ struct ifaddr * ifa_ifwithnet(addr) struct sockaddr *addr; { struct ifnet *ifp; struct ifaddr *ifa; struct ifaddr *ifa_maybe = 0; u_int af = addr->sa_family; char *addr_data = addr->sa_data, *cplim; if (af == AF_LINK) { struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; if (sdl->sdl_index && sdl->sdl_index < if_indexlim && ifindex2ifnet[sdl->sdl_index]) return (ifnet_addrs[sdl->sdl_index]); } TAILQ_FOREACH(ifp, &ifnet, if_list) { TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { char *cp, *cp2, *cp3; if (ifa->ifa_addr->sa_family != af || ifa->ifa_netmask == 0) next: continue; cp = addr_data; cp2 = ifa->ifa_addr->sa_data; cp3 = ifa->ifa_netmask->sa_data; cplim = (char *)ifa->ifa_netmask + ifa->ifa_netmask->sa_len; while (cp3 < cplim) if ((*cp++ ^ *cp2++) & *cp3++) /* want to continue for() loop */ goto next; if (ifa_maybe == 0 || rn_refines((caddr_t)ifa->ifa_netmask, (caddr_t)ifa_maybe->ifa_netmask)) ifa_maybe = ifa; } } return (ifa_maybe); } /* * Find an interface using a specific address family */ struct ifaddr * ifa_ifwithaf(af) int af; { struct ifnet *ifp; struct ifaddr *ifa; TAILQ_FOREACH(ifp, &ifnet, if_list) { TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family == af) return (ifa); } } return (NULL); } /* * Find an interface address specific to an interface best matching * a given address. */ struct ifaddr * ifaof_ifpforaddr(addr, ifp) struct sockaddr *addr; struct ifnet *ifp; { struct ifaddr *ifa; char *cp, *cp2, *cp3; char *cplim; struct ifaddr *ifa_maybe = 0; u_int af = addr->sa_family; if (af >= AF_MAX) return (NULL); TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { if (ifa->ifa_addr->sa_family != af) continue; ifa_maybe = ifa; if (ifa->ifa_netmask == 0) { if (equal(addr, ifa->ifa_addr) || (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) return (ifa); continue; } cp = addr->sa_data; cp2 = ifa->ifa_addr->sa_data; cp3 = ifa->ifa_netmask->sa_data; cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; for (; cp3 < cplim; cp3++) if ((*cp++ ^ *cp2++) & *cp3) break; if (cp3 == cplim) return (ifa); } return (ifa_maybe); } /* * Default action when installing a route with a Link Level gateway. * Lookup an appropriate real ifa to point to. * This should be moved to /sys/net/link.c eventually. */ void link_rtrequest(cmd, rt, info) int cmd; struct rtentry *rt; struct rt_addrinfo *info; { struct ifaddr *ifa; struct sockaddr *dst; struct ifnet *ifp; if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) return; if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) { IFAFREE(rt->rt_ifa); rt->rt_ifa = ifa; ifa->ifa_refcnt++; if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) ifa->ifa_rtrequest(cmd, rt, info); } } /* * Mark an interface down and notify protocols of * the transition. * NOTE: must be called at splsoftnet or equivalent. */ void if_down(struct ifnet *ifp) { struct ifaddr *ifa; splassert(IPL_SOFTNET); ifp->if_flags &= ~IFF_UP; microtime(&ifp->if_lastchange); TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { pfctlinput(PRC_IFDOWN, ifa->ifa_addr); } IFQ_PURGE(&ifp->if_snd); #if NCARP > 0 if (ifp->if_carp) carp_carpdev_state(ifp->if_carp); #endif rt_ifmsg(ifp); } /* * Mark an interface up and notify protocols of * the transition. * NOTE: must be called at splsoftnet or equivalent. */ void if_up(struct ifnet *ifp) { #ifdef notyet struct ifaddr *ifa; #endif splassert(IPL_SOFTNET); ifp->if_flags |= IFF_UP; microtime(&ifp->if_lastchange); #ifdef notyet /* this has no effect on IP, and will kill all ISO connections XXX */ TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { pfctlinput(PRC_IFUP, ifa->ifa_addr); } #endif #if NCARP > 0 if (ifp->if_carp) carp_carpdev_state(ifp->if_carp); #endif rt_ifmsg(ifp); #ifdef INET6 in6_if_up(ifp); #endif } /* * Flush an interface queue. */ void if_qflush(ifq) struct ifqueue *ifq; { struct mbuf *m, *n; n = ifq->ifq_head; while ((m = n) != NULL) { n = m->m_act; m_freem(m); } ifq->ifq_head = 0; ifq->ifq_tail = 0; ifq->ifq_len = 0; } /* * Handle interface watchdog timer routines. Called * from softclock, we decrement timers (if set) and * call the appropriate interface routine on expiration. */ void if_slowtimo(arg) void *arg; { struct timeout *to = (struct timeout *)arg; struct ifnet *ifp; int s = splimp(); TAILQ_FOREACH(ifp, &ifnet, if_list) { if (ifp->if_timer == 0 || --ifp->if_timer) continue; if (ifp->if_watchdog) (*ifp->if_watchdog)(ifp); } splx(s); timeout_add(to, hz / IFNET_SLOWHZ); } /* * Map interface name to * interface structure pointer. */ struct ifnet * ifunit(name) const char *name; { struct ifnet *ifp; TAILQ_FOREACH(ifp, &ifnet, if_list) { if (strcmp(ifp->if_xname, name) == 0) return (ifp); } return (NULL); } /* * Interface ioctls. */ int ifioctl(so, cmd, data, p) struct socket *so; u_long cmd; caddr_t data; struct proc *p; { struct ifnet *ifp; struct ifreq *ifr; char ifdescrbuf[IFDESCRSIZE]; int error = 0; size_t bytesdone; short oif_flags; switch (cmd) { case SIOCGIFCONF: case OSIOCGIFCONF: return (ifconf(cmd, data)); } ifr = (struct ifreq *)data; switch (cmd) { case SIOCIFCREATE: case SIOCIFDESTROY: if ((error = suser(p, 0)) != 0) return (error); return ((cmd == SIOCIFCREATE) ? if_clone_create(ifr->ifr_name) : if_clone_destroy(ifr->ifr_name)); case SIOCIFGCLONERS: return (if_clone_list((struct if_clonereq *)data)); } ifp = ifunit(ifr->ifr_name); if (ifp == 0) return (ENXIO); oif_flags = ifp->if_flags; switch (cmd) { case SIOCGIFFLAGS: ifr->ifr_flags = ifp->if_flags; break; case SIOCGIFMETRIC: ifr->ifr_metric = ifp->if_metric; break; case SIOCGIFMTU: ifr->ifr_mtu = ifp->if_mtu; break; case SIOCGIFDATA: error = copyout((caddr_t)&ifp->if_data, ifr->ifr_data, sizeof(ifp->if_data)); break; case SIOCSIFFLAGS: if ((error = suser(p, 0)) != 0) return (error); if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { int s = splimp(); if_down(ifp); splx(s); } if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { int s = splimp(); if_up(ifp); splx(s); } ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | (ifr->ifr_flags &~ IFF_CANTCHANGE); if (ifp->if_ioctl) (void) (*ifp->if_ioctl)(ifp, cmd, data); break; case SIOCSIFMETRIC: if ((error = suser(p, 0)) != 0) return (error); ifp->if_metric = ifr->ifr_metric; break; case SIOCSIFMTU: { #ifdef INET6 int oldmtu = ifp->if_mtu; #endif if ((error = suser(p, 0)) != 0) return (error); if (ifp->if_ioctl == NULL) return (EOPNOTSUPP); error = (*ifp->if_ioctl)(ifp, cmd, data); /* * If the link MTU changed, do network layer specific procedure. */ #ifdef INET6 if (ifp->if_mtu != oldmtu) nd6_setmtu(ifp); #endif break; } case SIOCSIFPHYADDR: case SIOCDIFPHYADDR: #ifdef INET6 case SIOCSIFPHYADDR_IN6: #endif case SIOCSLIFPHYADDR: case SIOCADDMULTI: case SIOCDELMULTI: case SIOCSIFMEDIA: if ((error = suser(p, 0)) != 0) return (error); /* FALLTHROUGH */ case SIOCGIFPSRCADDR: case SIOCGIFPDSTADDR: case SIOCGLIFPHYADDR: case SIOCGIFMEDIA: if (ifp->if_ioctl == 0) return (EOPNOTSUPP); error = (*ifp->if_ioctl)(ifp, cmd, data); break; case SIOCGIFDESCR: strlcpy(ifdescrbuf, ifp->if_description, IFDESCRSIZE); error = copyoutstr(ifdescrbuf, ifr->ifr_data, IFDESCRSIZE, &bytesdone); break; case SIOCSIFDESCR: if ((error = suser(p, 0)) != 0) return (error); error = copyinstr(ifr->ifr_data, ifdescrbuf, IFDESCRSIZE, &bytesdone); if (error == 0) { (void)memset(ifp->if_description, 0, IFDESCRSIZE); strlcpy(ifp->if_description, ifdescrbuf, IFDESCRSIZE); } break; default: if (so->so_proto == 0) return (EOPNOTSUPP); #if !defined(COMPAT_43) && !defined(COMPAT_LINUX) && !defined(COMPAT_SVR4) error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, (struct mbuf *) cmd, (struct mbuf *) data, (struct mbuf *) ifp)); #else { u_long ocmd = cmd; switch (cmd) { case SIOCSIFADDR: case SIOCSIFDSTADDR: case SIOCSIFBRDADDR: case SIOCSIFNETMASK: #if BYTE_ORDER != BIG_ENDIAN if (ifr->ifr_addr.sa_family == 0 && ifr->ifr_addr.sa_len < 16) { ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; ifr->ifr_addr.sa_len = 16; } #else if (ifr->ifr_addr.sa_len == 0) ifr->ifr_addr.sa_len = 16; #endif break; case OSIOCGIFADDR: cmd = SIOCGIFADDR; break; case OSIOCGIFDSTADDR: cmd = SIOCGIFDSTADDR; break; case OSIOCGIFBRDADDR: cmd = SIOCGIFBRDADDR; break; case OSIOCGIFNETMASK: cmd = SIOCGIFNETMASK; } error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, (struct mbuf *) cmd, (struct mbuf *) data, (struct mbuf *) ifp)); switch (ocmd) { case OSIOCGIFADDR: case OSIOCGIFDSTADDR: case OSIOCGIFBRDADDR: case OSIOCGIFNETMASK: *(u_int16_t *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; } } #endif break; } if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) { #ifdef INET6 if ((ifp->if_flags & IFF_UP) != 0) { int s = splnet(); in6_if_up(ifp); splx(s); } #endif } return (error); } /* * Return interface configuration * of system. List may be used * in later ioctl's (above) to get * other information. */ /*ARGSUSED*/ int ifconf(cmd, data) u_long cmd; caddr_t data; { struct ifconf *ifc = (struct ifconf *)data; struct ifnet *ifp; struct ifaddr *ifa; struct ifreq ifr, *ifrp; int space = ifc->ifc_len, error = 0; /* If ifc->ifc_len is 0, fill it in with the needed size and return. */ if (space == 0) { TAILQ_FOREACH(ifp, &ifnet, if_list) { struct sockaddr *sa; if (TAILQ_EMPTY(&ifp->if_addrlist)) space += sizeof (ifr); else TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { sa = ifa->ifa_addr; #if defined(COMPAT_43) || defined(COMPAT_LINUX) || defined(COMPAT_SVR4) if (cmd != OSIOCGIFCONF) #endif if (sa->sa_len > sizeof(*sa)) space += sa->sa_len - sizeof (*sa); space += sizeof (ifr); } } ifc->ifc_len = space; return (0); } ifrp = ifc->ifc_req; for (ifp = TAILQ_FIRST(&ifnet); space >= sizeof(ifr) && ifp != TAILQ_END(&ifnet); ifp = TAILQ_NEXT(ifp, if_list)) { bcopy(ifp->if_xname, ifr.ifr_name, IFNAMSIZ); if (TAILQ_EMPTY(&ifp->if_addrlist)) { bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof(ifr)); if (error) break; space -= sizeof (ifr), ifrp++; } else for (ifa = TAILQ_FIRST(&ifp->if_addrlist); space >= sizeof (ifr) && ifa != TAILQ_END(&ifp->if_addrlist); ifa = TAILQ_NEXT(ifa, ifa_list)) { struct sockaddr *sa = ifa->ifa_addr; #if defined(COMPAT_43) || defined(COMPAT_LINUX) || defined(COMPAT_SVR4) if (cmd == OSIOCGIFCONF) { struct osockaddr *osa = (struct osockaddr *)&ifr.ifr_addr; ifr.ifr_addr = *sa; osa->sa_family = sa->sa_family; error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr)); ifrp++; } else #endif if (sa->sa_len <= sizeof(*sa)) { ifr.ifr_addr = *sa; error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr)); ifrp++; } else { space -= sa->sa_len - sizeof(*sa); if (space < sizeof (ifr)) break; error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr.ifr_name)); if (error == 0) error = copyout((caddr_t)sa, (caddr_t)&ifrp->ifr_addr, sa->sa_len); ifrp = (struct ifreq *)(sa->sa_len + (caddr_t)&ifrp->ifr_addr); } if (error) break; space -= sizeof (ifr); } } ifc->ifc_len -= space; return (error); } /* * Dummy functions replaced in ifnet during detach (if protocols decide to * fiddle with the if during detach. */ void if_detached_start(struct ifnet *ifp) { struct mbuf *m; while (1) { IF_DEQUEUE(&ifp->if_snd, m); if (m == NULL) return; m_freem(m); } } int if_detached_ioctl(struct ifnet *ifp, u_long a, caddr_t b) { return ENODEV; } int if_detached_init(struct ifnet *ifp) { return (ENXIO); } void if_detached_watchdog(struct ifnet *ifp) { /* nothing */ } /* * Set/clear promiscuous mode on interface ifp based on the truth value * of pswitch. The calls are reference counted so that only the first * "on" request actually has an effect, as does the final "off" request. * Results are undefined if the "off" and "on" requests are not matched. */ int ifpromisc(ifp, pswitch) struct ifnet *ifp; int pswitch; { struct ifreq ifr; if (pswitch) { /* * If the device is not configured up, we cannot put it in * promiscuous mode. */ if ((ifp->if_flags & IFF_UP) == 0) return (ENETDOWN); if (ifp->if_pcount++ != 0) return (0); ifp->if_flags |= IFF_PROMISC; } else { if (--ifp->if_pcount > 0) return (0); ifp->if_flags &= ~IFF_PROMISC; /* * If the device is not configured up, we should not need to * turn off promiscuous mode (device should have turned it * off when interface went down; and will look at IFF_PROMISC * again next time interface comes up). */ if ((ifp->if_flags & IFF_UP) == 0) return (0); } ifr.ifr_flags = ifp->if_flags; return ((*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr)); }