/* $OpenBSD: route.c,v 1.81 2006/06/19 08:14:06 claudio Exp $ */ /* $NetBSD: route.c,v 1.14 1996/02/13 22:00:46 christos 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, 1991, 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. * * @(#)route.c 8.2 (Berkeley) 11/15/93 */ /* * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 * * NRL grants permission for redistribution and use in source and binary * forms, with or without modification, of the software and documentation * created at NRL 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. All advertising materials mentioning features or use of this software * must display the following acknowledgements: * This product includes software developed by the University of * California, Berkeley and its contributors. * This product includes software developed at the Information * Technology Division, US Naval Research Laboratory. * 4. Neither the name of the NRL nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL 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 NRL 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. * * The views and conclusions contained in the software and documentation * are those of the authors and should not be interpreted as representing * official policies, either expressed or implied, of the US Naval * Research Laboratory (NRL). */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef IPSEC #include extern struct ifnet encif; struct ifaddr *encap_findgwifa(struct sockaddr *); #endif #define SA(p) ((struct sockaddr *)(p)) struct route_cb route_cb; struct rtstat rtstat; struct radix_node_head ***rt_tables; u_int8_t af2rtafidx[AF_MAX+1]; u_int8_t rtafidx_max; u_int rtbl_id_max = 0; int rttrash; /* routes not in table but not freed */ struct sockaddr wildcard; /* zero cookie for wildcard searches */ struct pool rtentry_pool; /* pool for rtentry structures */ struct pool rttimer_pool; /* pool for rttimer structures */ int rtable_init(struct radix_node_head ***); int okaytoclone(u_int, int); int rtdeletemsg(struct rtentry *, u_int); int rtflushclone1(struct radix_node *, void *); void rtflushclone(struct radix_node_head *, struct rtentry *); int rt_if_remove_rtdelete(struct radix_node *, void *); #define LABELID_MAX 50000 struct rt_label { TAILQ_ENTRY(rt_label) rtl_entry; char rtl_name[RTLABEL_LEN]; u_int16_t rtl_id; int rtl_ref; }; TAILQ_HEAD(rt_labels, rt_label) rt_labels = TAILQ_HEAD_INITIALIZER(rt_labels); #ifdef IPSEC struct ifaddr * encap_findgwifa(struct sockaddr *gw) { return (TAILQ_FIRST(&encif.if_addrlist)); } #endif int rtable_init(struct radix_node_head ***table) { void **p; struct domain *dom; if ((p = malloc(sizeof(void *) * (rtafidx_max + 1), M_RTABLE, M_NOWAIT)) == NULL) return (-1); bzero(p, sizeof(void *) * (rtafidx_max + 1)); /* 2nd pass: attach */ for (dom = domains; dom != NULL; dom = dom->dom_next) if (dom->dom_rtattach) dom->dom_rtattach(&p[af2rtafidx[dom->dom_family]], dom->dom_rtoffset); *table = (struct radix_node_head **)p; return (0); } void route_init() { struct domain *dom; pool_init(&rtentry_pool, sizeof(struct rtentry), 0, 0, 0, "rtentpl", NULL); rn_init(); /* initialize all zeroes, all ones, mask table */ bzero(af2rtafidx, sizeof(af2rtafidx)); rtafidx_max = 1; /* must have NULL at index 0, so start at 1 */ /* find out how many tables to allocate */ for (dom = domains; dom != NULL; dom = dom->dom_next) if (dom->dom_rtattach) af2rtafidx[dom->dom_family] = rtafidx_max++; if (rtable_add(0) == -1) panic("route_init rtable_add"); } int rtable_add(u_int id) /* must be called at splsoftnet */ { void *p; if (id > RT_TABLEID_MAX) return (-1); if (id == 0 || id > rtbl_id_max) { size_t newlen = sizeof(void *) * (id+1); if ((p = malloc(newlen, M_RTABLE, M_NOWAIT)) == NULL) return (-1); bzero(p, newlen); if (id > 0) { bcopy(rt_tables, p, sizeof(void *) * (rtbl_id_max+1)); free(rt_tables, M_RTABLE); } rt_tables = p; rtbl_id_max = id; } if (rt_tables[id] != NULL) /* already exists */ return (-1); return (rtable_init(&rt_tables[id])); } int rtable_exists(u_int id) /* verify table with that ID exists */ { if (id > RT_TABLEID_MAX) return (0); if (id > rtbl_id_max) return (0); if (rt_tables[id] == NULL) /* should not happen */ return (0); return (1); } void rtalloc_noclone(struct route *ro, int howstrict) { if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP)) return; /* XXX */ ro->ro_rt = rtalloc2(&ro->ro_dst, 1, howstrict); } int okaytoclone(u_int flags, int howstrict) { if (howstrict == ALL_CLONING) return (1); if (howstrict == ONNET_CLONING && !(flags & RTF_GATEWAY)) return (1); return (0); } struct rtentry * rtalloc2(struct sockaddr *dst, int report, int howstrict) { struct radix_node_head *rnh; struct rtentry *rt; struct radix_node *rn; struct rtentry *newrt = 0; struct rt_addrinfo info; int s = splnet(), err = 0, msgtype = RTM_MISS; rnh = rt_gettable(dst->sa_family, 0); if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) && ((rn->rn_flags & RNF_ROOT) == 0)) { newrt = rt = (struct rtentry *)rn; if (report && (rt->rt_flags & RTF_CLONING) && okaytoclone(rt->rt_flags, howstrict)) { err = rtrequest(RTM_RESOLVE, dst, SA(0), SA(0), 0, &newrt, 0); if (err) { newrt = rt; rt->rt_refcnt++; goto miss; } if ((rt = newrt) && (rt->rt_flags & RTF_XRESOLVE)) { msgtype = RTM_RESOLVE; goto miss; } } else rt->rt_refcnt++; } else { rtstat.rts_unreach++; miss: if (report) { bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = dst; rt_missmsg(msgtype, &info, 0, NULL, err, 0); } } splx(s); return (newrt); } /* * Packet routing routines. */ void rtalloc(struct route *ro) { if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP)) return; /* XXX */ ro->ro_rt = rtalloc1(&ro->ro_dst, 1, 0); } struct rtentry * rtalloc1(struct sockaddr *dst, int report, u_int tableid) { struct radix_node_head *rnh; struct rtentry *rt; struct radix_node *rn; struct rtentry *newrt = 0; struct rt_addrinfo info; int s = splsoftnet(), err = 0, msgtype = RTM_MISS; rnh = rt_gettable(dst->sa_family, tableid); if (rnh && (rn = rnh->rnh_matchaddr((caddr_t)dst, rnh)) && ((rn->rn_flags & RNF_ROOT) == 0)) { newrt = rt = (struct rtentry *)rn; if (report && (rt->rt_flags & RTF_CLONING)) { err = rtrequest(RTM_RESOLVE, dst, SA(NULL), SA(NULL), 0, &newrt, tableid); if (err) { newrt = rt; rt->rt_refcnt++; goto miss; } if ((rt = newrt) && (rt->rt_flags & RTF_XRESOLVE)) { msgtype = RTM_RESOLVE; goto miss; } /* Inform listeners of the new route */ bzero(&info, sizeof(info)); info.rti_info[RTAX_DST] = rt_key(rt); info.rti_info[RTAX_NETMASK] = rt_mask(rt); info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; if (rt->rt_ifp != NULL) { info.rti_info[RTAX_IFP] = TAILQ_FIRST(&rt->rt_ifp->if_addrlist)->ifa_addr; info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; } rt_missmsg(RTM_ADD, &info, rt->rt_flags, rt->rt_ifp, 0, tableid); } else rt->rt_refcnt++; } else { if (dst->sa_family != PF_KEY) rtstat.rts_unreach++; /* * IP encapsulation does lots of lookups where we don't need nor want * the RTM_MISSes that would be generated. It causes RTM_MISS storms * sent upward breaking user-level routing queries. */ miss: if (report && dst->sa_family != PF_KEY) { bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = dst; rt_missmsg(msgtype, &info, 0, NULL, err, tableid); } } splx(s); return (newrt); } void rtfree(struct rtentry *rt) { struct ifaddr *ifa; if (rt == NULL) panic("rtfree"); rt->rt_refcnt--; if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_UP) == 0) { if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT)) panic("rtfree 2"); rttrash--; if (rt->rt_refcnt < 0) { printf("rtfree: %p not freed (neg refs)\n", rt); return; } rt_timer_remove_all(rt); ifa = rt->rt_ifa; if (ifa) IFAFREE(ifa); rtlabel_unref(rt->rt_labelid); Free(rt_key(rt)); pool_put(&rtentry_pool, rt); } } void ifafree(struct ifaddr *ifa) { if (ifa == NULL) panic("ifafree"); if (ifa->ifa_refcnt == 0) free(ifa, M_IFADDR); else ifa->ifa_refcnt--; } /* * Force a routing table entry to the specified * destination to go through the given gateway. * Normally called as a result of a routing redirect * message from the network layer. * * N.B.: must be called at splsoftnet */ void rtredirect(struct sockaddr *dst, struct sockaddr *gateway, struct sockaddr *netmask, int flags, struct sockaddr *src, struct rtentry **rtp) { struct rtentry *rt; int error = 0; u_int32_t *stat = NULL; struct rt_addrinfo info; struct ifaddr *ifa; struct ifnet *ifp = NULL; splassert(IPL_SOFTNET); /* verify the gateway is directly reachable */ if ((ifa = ifa_ifwithnet(gateway)) == NULL) { error = ENETUNREACH; goto out; } ifp = ifa->ifa_ifp; rt = rtalloc1(dst, 0, 0); /* * If the redirect isn't from our current router for this dst, * it's either old or wrong. If it redirects us to ourselves, * we have a routing loop, perhaps as a result of an interface * going down recently. */ #define equal(a1, a2) \ ((a1)->sa_len == (a2)->sa_len && \ bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0) if (!(flags & RTF_DONE) && rt && (!equal(src, rt->rt_gateway) || rt->rt_ifa != ifa)) error = EINVAL; else if (ifa_ifwithaddr(gateway) != NULL) error = EHOSTUNREACH; if (error) goto done; /* * Create a new entry if we just got back a wildcard entry * or the lookup failed. This is necessary for hosts * which use routing redirects generated by smart gateways * to dynamically build the routing tables. */ if ((rt == NULL) || (rt_mask(rt) && rt_mask(rt)->sa_len < 2)) goto create; /* * Don't listen to the redirect if it's * for a route to an interface. */ if (rt->rt_flags & RTF_GATEWAY) { if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) { /* * Changing from route to net => route to host. * Create new route, rather than smashing route to net. */ create: if (rt) rtfree(rt); flags |= RTF_GATEWAY | RTF_DYNAMIC; bzero(&info, sizeof(info)); info.rti_info[RTAX_DST] = dst; info.rti_info[RTAX_GATEWAY] = gateway; info.rti_info[RTAX_NETMASK] = netmask; info.rti_ifa = ifa; info.rti_flags = flags; rt = NULL; error = rtrequest1(RTM_ADD, &info, &rt, 0); if (rt != NULL) flags = rt->rt_flags; stat = &rtstat.rts_dynamic; } else { /* * Smash the current notion of the gateway to * this destination. Should check about netmask!!! */ rt->rt_flags |= RTF_MODIFIED; flags |= RTF_MODIFIED; stat = &rtstat.rts_newgateway; rt_setgate(rt, rt_key(rt), gateway, 0); } } else error = EHOSTUNREACH; done: if (rt) { if (rtp && !error) *rtp = rt; else rtfree(rt); } out: if (error) rtstat.rts_badredirect++; else if (stat != NULL) (*stat)++; bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = dst; info.rti_info[RTAX_GATEWAY] = gateway; info.rti_info[RTAX_NETMASK] = netmask; info.rti_info[RTAX_AUTHOR] = src; rt_missmsg(RTM_REDIRECT, &info, flags, ifp, error, 0); } /* * Delete a route and generate a message */ int rtdeletemsg(struct rtentry *rt, u_int tableid) { int error; struct rt_addrinfo info; struct ifnet *ifp; /* * Request the new route so that the entry is not actually * deleted. That will allow the information being reported to * be accurate (and consistent with route_output()). */ bzero((caddr_t)&info, sizeof(info)); info.rti_info[RTAX_DST] = rt_key(rt); info.rti_info[RTAX_NETMASK] = rt_mask(rt); info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; info.rti_flags = rt->rt_flags; ifp = rt->rt_ifp; error = rtrequest1(RTM_DELETE, &info, &rt, tableid); rt_missmsg(RTM_DELETE, &info, info.rti_flags, ifp, error, tableid); /* Adjust the refcount */ if (error == 0 && rt->rt_refcnt <= 0) { rt->rt_refcnt++; rtfree(rt); } return (error); } int rtflushclone1(struct radix_node *rn, void *arg) { struct rtentry *rt, *parent; rt = (struct rtentry *)rn; parent = (struct rtentry *)arg; if ((rt->rt_flags & RTF_CLONED) != 0 && rt->rt_parent == parent) rtdeletemsg(rt, 0); return 0; } void rtflushclone(struct radix_node_head *rnh, struct rtentry *parent) { #ifdef DIAGNOSTIC if (!parent || (parent->rt_flags & RTF_CLONING) == 0) panic("rtflushclone: called with a non-cloning route"); if (!rnh->rnh_walktree) panic("rtflushclone: no rnh_walktree"); #endif rnh->rnh_walktree(rnh, rtflushclone1, (void *)parent); } int rtioctl(u_long req, caddr_t data, struct proc *p) { return (EOPNOTSUPP); } struct ifaddr * ifa_ifwithroute(int flags, struct sockaddr *dst, struct sockaddr *gateway) { struct ifaddr *ifa; #ifdef IPSEC /* * If the destination is a PF_KEY address, we'll look * for the existence of a encap interface number or address * in the options list of the gateway. By default, we'll return * enc0. */ if (dst && (dst->sa_family == PF_KEY)) return (encap_findgwifa(gateway)); #endif if ((flags & RTF_GATEWAY) == 0) { /* * If we are adding a route to an interface, * and the interface is a pt to pt link * we should search for the destination * as our clue to the interface. Otherwise * we can use the local address. */ ifa = NULL; if (flags & RTF_HOST) ifa = ifa_ifwithdstaddr(dst); if (ifa == NULL) ifa = ifa_ifwithaddr(gateway); } else { /* * If we are adding a route to a remote net * or host, the gateway may still be on the * other end of a pt to pt link. */ ifa = ifa_ifwithdstaddr(gateway); } if (ifa == NULL) ifa = ifa_ifwithnet(gateway); if (ifa == NULL) { struct rtentry *rt = rtalloc1(gateway, 0, 0); if (rt == NULL) return (NULL); rt->rt_refcnt--; /* The gateway must be local if the same address family. */ if ((rt->rt_flags & RTF_GATEWAY) && rt_key(rt)->sa_family == dst->sa_family) return (0); if ((ifa = rt->rt_ifa) == NULL) return (NULL); } if (ifa->ifa_addr->sa_family != dst->sa_family) { struct ifaddr *oifa = ifa; ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp); if (ifa == NULL) ifa = oifa; } return (ifa); } #define ROUNDUP(a) (a>0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) int rtrequest(int req, struct sockaddr *dst, struct sockaddr *gateway, struct sockaddr *netmask, int flags, struct rtentry **ret_nrt, u_int tableid) { struct rt_addrinfo info; bzero(&info, sizeof(info)); info.rti_flags = flags; info.rti_info[RTAX_DST] = dst; info.rti_info[RTAX_GATEWAY] = gateway; info.rti_info[RTAX_NETMASK] = netmask; return (rtrequest1(req, &info, ret_nrt, tableid)); } int rt_getifa(struct rt_addrinfo *info) { struct ifaddr *ifa; int error = 0; /* * ifp may be specified by sockaddr_dl when protocol address * is ambiguous */ if (info->rti_ifp == NULL && info->rti_info[RTAX_IFP] != NULL && info->rti_info[RTAX_IFP]->sa_family == AF_LINK && (ifa = ifa_ifwithnet((struct sockaddr *)info->rti_info[RTAX_IFP])) != NULL) info->rti_ifp = ifa->ifa_ifp; if (info->rti_ifa == NULL && info->rti_info[RTAX_IFA] != NULL) info->rti_ifa = ifa_ifwithaddr(info->rti_info[RTAX_IFA]); if (info->rti_ifa == NULL) { struct sockaddr *sa; if ((sa = info->rti_info[RTAX_IFA]) == NULL) if ((sa = info->rti_info[RTAX_GATEWAY]) == NULL) sa = info->rti_info[RTAX_DST]; if (sa != NULL && info->rti_ifp != NULL) info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp); else if (info->rti_info[RTAX_DST] != NULL && info->rti_info[RTAX_GATEWAY] != NULL) info->rti_ifa = ifa_ifwithroute(info->rti_flags, info->rti_info[RTAX_DST], info->rti_info[RTAX_GATEWAY]); else if (sa != NULL) info->rti_ifa = ifa_ifwithroute(info->rti_flags, sa, sa); } if ((ifa = info->rti_ifa) != NULL) { if (info->rti_ifp == NULL) info->rti_ifp = ifa->ifa_ifp; } else error = ENETUNREACH; return (error); } int rtrequest1(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt, u_int tableid) { int s = splsoftnet(); int error = 0; struct rtentry *rt, *crt; struct radix_node *rn; struct radix_node_head *rnh; struct ifaddr *ifa; struct sockaddr *ndst; struct sockaddr_rtlabel *sa_rl; #define senderr(x) { error = x ; goto bad; } if ((rnh = rt_gettable(info->rti_info[RTAX_DST]->sa_family, tableid)) == NULL) senderr(EAFNOSUPPORT); if (info->rti_flags & RTF_HOST) info->rti_info[RTAX_NETMASK] = NULL; switch (req) { case RTM_DELETE: if ((rn = rnh->rnh_lookup(info->rti_info[RTAX_DST], info->rti_info[RTAX_NETMASK], rnh)) == NULL) senderr(ESRCH); rt = (struct rtentry *)rn; #ifndef SMALL_KERNEL /* * if we got multipath routes, we require users to specify * a matching RTAX_GATEWAY. */ if (rn_mpath_capable(rnh)) { rt = rt_mpath_matchgate(rt, info->rti_info[RTAX_GATEWAY]); rn = (struct radix_node *)rt; if (!rt) senderr(ESRCH); } #endif if ((rn = rnh->rnh_deladdr(info->rti_info[RTAX_DST], info->rti_info[RTAX_NETMASK], rnh, rn)) == NULL) senderr(ESRCH); rt = (struct rtentry *)rn; /* clean up any cloned children */ if ((rt->rt_flags & RTF_CLONING) != 0) rtflushclone(rnh, rt); if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT)) panic ("rtrequest delete"); if (rt->rt_gwroute) { rt = rt->rt_gwroute; RTFREE(rt); (rt = (struct rtentry *)rn)->rt_gwroute = NULL; } if (rt->rt_parent) { rt->rt_parent->rt_refcnt--; rt->rt_parent = NULL; } #ifndef SMALL_KERNEL if (rn_mpath_capable(rnh)) { if ((rn = rnh->rnh_lookup(info->rti_info[RTAX_DST], info->rti_info[RTAX_NETMASK], rnh)) != NULL && rn_mpath_next(rn) == NULL) ((struct rtentry *)rn)->rt_flags &= ~RTF_MPATH; } #endif rt->rt_flags &= ~RTF_UP; if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest) ifa->ifa_rtrequest(RTM_DELETE, rt, info); rttrash++; if (ret_nrt) *ret_nrt = rt; else if (rt->rt_refcnt <= 0) { rt->rt_refcnt++; rtfree(rt); } break; case RTM_RESOLVE: if (ret_nrt == NULL || (rt = *ret_nrt) == NULL) senderr(EINVAL); if ((rt->rt_flags & RTF_CLONING) == 0) senderr(EINVAL); ifa = rt->rt_ifa; info->rti_flags = rt->rt_flags & ~(RTF_CLONING | RTF_STATIC); info->rti_flags |= RTF_CLONED; info->rti_info[RTAX_GATEWAY] = rt->rt_gateway; if ((info->rti_info[RTAX_NETMASK] = rt->rt_genmask) == NULL) info->rti_flags |= RTF_HOST; goto makeroute; case RTM_ADD: if (info->rti_ifa == 0 && (error = rt_getifa(info))) senderr(error); ifa = info->rti_ifa; makeroute: rt = pool_get(&rtentry_pool, PR_NOWAIT); if (rt == NULL) senderr(ENOBUFS); Bzero(rt, sizeof(*rt)); rt->rt_flags = RTF_UP | info->rti_flags; LIST_INIT(&rt->rt_timer); if (rt_setgate(rt, info->rti_info[RTAX_DST], info->rti_info[RTAX_GATEWAY], tableid)) { pool_put(&rtentry_pool, rt); senderr(ENOBUFS); } ndst = rt_key(rt); if (info->rti_info[RTAX_NETMASK] != NULL) { rt_maskedcopy(info->rti_info[RTAX_DST], ndst, info->rti_info[RTAX_NETMASK]); } else Bcopy(info->rti_info[RTAX_DST], ndst, info->rti_info[RTAX_DST]->sa_len); #ifndef SMALL_KERNEL /* do not permit exactly the same dst/mask/gw pair */ if (rn_mpath_capable(rnh) && rt_mpath_conflict(rnh, rt, info->rti_info[RTAX_NETMASK], info->rti_flags & RTF_MPATH)) { if (rt->rt_gwroute) rtfree(rt->rt_gwroute); Free(rt_key(rt)); pool_put(&rtentry_pool, rt); senderr(EEXIST); } #endif if (info->rti_info[RTAX_LABEL] != NULL) { sa_rl = (struct sockaddr_rtlabel *) info->rti_info[RTAX_LABEL]; rt->rt_labelid = rtlabel_name2id(sa_rl->sr_label); } ifa->ifa_refcnt++; rt->rt_ifa = ifa; rt->rt_ifp = ifa->ifa_ifp; if (req == RTM_RESOLVE) { /* * Copy both metrics and a back pointer to the cloned * route's parent. */ rt->rt_rmx = (*ret_nrt)->rt_rmx; /* copy metrics */ rt->rt_parent = *ret_nrt; /* Back ptr. to parent. */ rt->rt_parent->rt_refcnt++; } rn = rnh->rnh_addaddr((caddr_t)ndst, (caddr_t)info->rti_info[RTAX_NETMASK], rnh, rt->rt_nodes); if (rn == NULL && (crt = rtalloc1(ndst, 0, tableid)) != NULL) { /* overwrite cloned route */ if ((crt->rt_flags & RTF_CLONED) != 0) { rtdeletemsg(crt, tableid); rn = rnh->rnh_addaddr((caddr_t)ndst, (caddr_t)info->rti_info[RTAX_NETMASK], rnh, rt->rt_nodes); } RTFREE(crt); } if (rn == 0) { IFAFREE(ifa); if ((rt->rt_flags & RTF_CLONED) != 0 && rt->rt_parent) rtfree(rt->rt_parent); if (rt->rt_gwroute) rtfree(rt->rt_gwroute); Free(rt_key(rt)); pool_put(&rtentry_pool, rt); senderr(EEXIST); } #ifndef SMALL_KERNEL if (rn_mpath_capable(rnh) && (rn = rnh->rnh_lookup(info->rti_info[RTAX_DST], info->rti_info[RTAX_NETMASK], rnh)) != NULL) { if (rn_mpath_next(rn) == NULL) ((struct rtentry *)rn)->rt_flags &= ~RTF_MPATH; else ((struct rtentry *)rn)->rt_flags |= RTF_MPATH; } #endif if (ifa->ifa_rtrequest) ifa->ifa_rtrequest(req, rt, info); if (ret_nrt) { *ret_nrt = rt; rt->rt_refcnt++; } if ((rt->rt_flags & RTF_CLONING) != 0) { /* clean up any cloned children */ rtflushclone(rnh, rt); } if_group_routechange(info->rti_info[RTAX_DST], info->rti_info[RTAX_NETMASK]); break; } bad: splx(s); return (error); } int rt_setgate(struct rtentry *rt0, struct sockaddr *dst, struct sockaddr *gate, u_int tableid) { caddr_t new, old; int dlen = ROUNDUP(dst->sa_len), glen = ROUNDUP(gate->sa_len); struct rtentry *rt = rt0; if (rt->rt_gateway == NULL || glen > ROUNDUP(rt->rt_gateway->sa_len)) { old = (caddr_t)rt_key(rt); R_Malloc(new, caddr_t, dlen + glen); if (new == NULL) return 1; rt->rt_nodes->rn_key = new; } else { new = rt->rt_nodes->rn_key; old = NULL; } Bcopy(gate, (rt->rt_gateway = (struct sockaddr *)(new + dlen)), glen); if (old) { Bcopy(dst, new, dlen); Free(old); } if (rt->rt_gwroute != NULL) { rt = rt->rt_gwroute; RTFREE(rt); rt = rt0; rt->rt_gwroute = NULL; } if (rt->rt_flags & RTF_GATEWAY) { rt->rt_gwroute = rtalloc1(gate, 1, tableid); /* * If we switched gateways, grab the MTU from the new * gateway route if the current MTU is 0 or greater * than the MTU of gateway. * Note that, if the MTU of gateway is 0, we will reset the * MTU of the route to run PMTUD again from scratch. XXX */ if (rt->rt_gwroute && !(rt->rt_rmx.rmx_locks & RTV_MTU) && rt->rt_rmx.rmx_mtu && rt->rt_rmx.rmx_mtu > rt->rt_gwroute->rt_rmx.rmx_mtu) { rt->rt_rmx.rmx_mtu = rt->rt_gwroute->rt_rmx.rmx_mtu; } } return (0); } void rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask) { u_char *cp1 = (u_char *)src; u_char *cp2 = (u_char *)dst; u_char *cp3 = (u_char *)netmask; u_char *cplim = cp2 + *cp3; u_char *cplim2 = cp2 + *cp1; *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */ cp3 += 2; if (cplim > cplim2) cplim = cplim2; while (cp2 < cplim) *cp2++ = *cp1++ & *cp3++; if (cp2 < cplim2) bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2)); } /* * Set up a routing table entry, normally * for an interface. */ int rtinit(struct ifaddr *ifa, int cmd, int flags) { struct rtentry *rt; struct sockaddr *dst, *deldst; struct mbuf *m = NULL; struct rtentry *nrt = NULL; int error; struct rt_addrinfo info; dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr; if (cmd == RTM_DELETE) { if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) { m = m_get(M_DONTWAIT, MT_SONAME); if (m == NULL) return (ENOBUFS); deldst = mtod(m, struct sockaddr *); rt_maskedcopy(dst, deldst, ifa->ifa_netmask); dst = deldst; } if ((rt = rtalloc1(dst, 0, 0)) != NULL) { rt->rt_refcnt--; if (rt->rt_ifa != ifa) { if (m != NULL) (void) m_free(m); return (flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); } } } bzero(&info, sizeof(info)); info.rti_ifa = ifa; info.rti_flags = flags | ifa->ifa_flags; info.rti_info[RTAX_DST] = dst; info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; /* * XXX here, it seems that we are assuming that ifa_netmask is NULL * for RTF_HOST. bsdi4 passes NULL explicitly (via intermediate * variable) when RTF_HOST is 1. still not sure if i can safely * change it to meet bsdi4 behavior. */ info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; error = rtrequest1(cmd, &info, &nrt, 0); if (cmd == RTM_DELETE && error == 0 && (rt = nrt) != NULL) { rt_newaddrmsg(cmd, ifa, error, nrt); if (rt->rt_refcnt <= 0) { rt->rt_refcnt++; rtfree(rt); } } if (cmd == RTM_ADD && error == 0 && (rt = nrt) != NULL) { rt->rt_refcnt--; if (rt->rt_ifa != ifa) { printf("rtinit: wrong ifa (%p) was (%p)\n", ifa, rt->rt_ifa); if (rt->rt_ifa->ifa_rtrequest) rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, NULL); IFAFREE(rt->rt_ifa); rt->rt_ifa = ifa; rt->rt_ifp = ifa->ifa_ifp; ifa->ifa_refcnt++; if (ifa->ifa_rtrequest) ifa->ifa_rtrequest(RTM_ADD, rt, NULL); } rt_newaddrmsg(cmd, ifa, error, nrt); } return (error); } /* * Route timer routines. These routes allow functions to be called * for various routes at any time. This is useful in supporting * path MTU discovery and redirect route deletion. * * This is similar to some BSDI internal functions, but it provides * for multiple queues for efficiency's sake... */ LIST_HEAD(, rttimer_queue) rttimer_queue_head; static int rt_init_done = 0; #define RTTIMER_CALLOUT(r) { \ if (r->rtt_func != NULL) { \ (*r->rtt_func)(r->rtt_rt, r); \ } else { \ rtrequest((int) RTM_DELETE, \ (struct sockaddr *)rt_key(r->rtt_rt), \ 0, 0, 0, 0, 0); \ } \ } /* * Some subtle order problems with domain initialization mean that * we cannot count on this being run from rt_init before various * protocol initializations are done. Therefore, we make sure * that this is run when the first queue is added... */ void rt_timer_init() { static struct timeout rt_timer_timeout; if (rt_init_done) panic("rt_timer_init: already initialized"); pool_init(&rttimer_pool, sizeof(struct rttimer), 0, 0, 0, "rttmrpl", NULL); LIST_INIT(&rttimer_queue_head); timeout_set(&rt_timer_timeout, rt_timer_timer, &rt_timer_timeout); timeout_add(&rt_timer_timeout, hz); /* every second */ rt_init_done = 1; } struct rttimer_queue * rt_timer_queue_create(u_int timeout) { struct rttimer_queue *rtq; if (rt_init_done == 0) rt_timer_init(); R_Malloc(rtq, struct rttimer_queue *, sizeof *rtq); if (rtq == NULL) return (NULL); Bzero(rtq, sizeof *rtq); rtq->rtq_timeout = timeout; rtq->rtq_count = 0; TAILQ_INIT(&rtq->rtq_head); LIST_INSERT_HEAD(&rttimer_queue_head, rtq, rtq_link); return (rtq); } void rt_timer_queue_change(struct rttimer_queue *rtq, long timeout) { rtq->rtq_timeout = timeout; } void rt_timer_queue_destroy(struct rttimer_queue *rtq, int destroy) { struct rttimer *r; while ((r = TAILQ_FIRST(&rtq->rtq_head)) != NULL) { LIST_REMOVE(r, rtt_link); TAILQ_REMOVE(&rtq->rtq_head, r, rtt_next); if (destroy) RTTIMER_CALLOUT(r); pool_put(&rttimer_pool, r); if (rtq->rtq_count > 0) rtq->rtq_count--; else printf("rt_timer_queue_destroy: rtq_count reached 0\n"); } LIST_REMOVE(rtq, rtq_link); /* * Caller is responsible for freeing the rttimer_queue structure. */ } unsigned long rt_timer_count(struct rttimer_queue *rtq) { return (rtq->rtq_count); } void rt_timer_remove_all(struct rtentry *rt) { struct rttimer *r; while ((r = LIST_FIRST(&rt->rt_timer)) != NULL) { LIST_REMOVE(r, rtt_link); TAILQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next); if (r->rtt_queue->rtq_count > 0) r->rtt_queue->rtq_count--; else printf("rt_timer_remove_all: rtq_count reached 0\n"); pool_put(&rttimer_pool, r); } } int rt_timer_add(struct rtentry *rt, void (*func)(struct rtentry *, struct rttimer *), struct rttimer_queue *queue) { struct rttimer *r; long current_time; current_time = time_uptime; rt->rt_rmx.rmx_expire = time_second + queue->rtq_timeout; /* * If there's already a timer with this action, destroy it before * we add a new one. */ for (r = LIST_FIRST(&rt->rt_timer); r != NULL; r = LIST_NEXT(r, rtt_link)) { if (r->rtt_func == func) { LIST_REMOVE(r, rtt_link); TAILQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next); if (r->rtt_queue->rtq_count > 0) r->rtt_queue->rtq_count--; else printf("rt_timer_add: rtq_count reached 0\n"); pool_put(&rttimer_pool, r); break; /* only one per list, so we can quit... */ } } r = pool_get(&rttimer_pool, PR_NOWAIT); if (r == NULL) return (ENOBUFS); Bzero(r, sizeof(*r)); r->rtt_rt = rt; r->rtt_time = current_time; r->rtt_func = func; r->rtt_queue = queue; LIST_INSERT_HEAD(&rt->rt_timer, r, rtt_link); TAILQ_INSERT_TAIL(&queue->rtq_head, r, rtt_next); r->rtt_queue->rtq_count++; return (0); } struct radix_node_head * rt_gettable(sa_family_t af, u_int id) { return (rt_tables[id][af2rtafidx[af]]); } struct radix_node * rt_lookup(struct sockaddr *dst, struct sockaddr *mask, int tableid) { struct radix_node_head *rnh; if ((rnh = rt_gettable(dst->sa_family, tableid)) == NULL) return (NULL); return (rnh->rnh_lookup(dst, mask, rnh)); } /* ARGSUSED */ void rt_timer_timer(void *arg) { struct timeout *to = (struct timeout *)arg; struct rttimer_queue *rtq; struct rttimer *r; long current_time; int s; current_time = time_uptime; s = splsoftnet(); for (rtq = LIST_FIRST(&rttimer_queue_head); rtq != NULL; rtq = LIST_NEXT(rtq, rtq_link)) { while ((r = TAILQ_FIRST(&rtq->rtq_head)) != NULL && (r->rtt_time + rtq->rtq_timeout) < current_time) { LIST_REMOVE(r, rtt_link); TAILQ_REMOVE(&rtq->rtq_head, r, rtt_next); RTTIMER_CALLOUT(r); pool_put(&rttimer_pool, r); if (rtq->rtq_count > 0) rtq->rtq_count--; else printf("rt_timer_timer: rtq_count reached 0\n"); } } splx(s); timeout_add(to, hz); /* every second */ } u_int16_t rtlabel_name2id(char *name) { struct rt_label *label, *p = NULL; u_int16_t new_id = 1; if (!name[0]) return (0); TAILQ_FOREACH(label, &rt_labels, rtl_entry) if (strcmp(name, label->rtl_name) == 0) { label->rtl_ref++; return (label->rtl_id); } /* * to avoid fragmentation, we do a linear search from the beginning * and take the first free slot we find. if there is none or the list * is empty, append a new entry at the end. */ if (!TAILQ_EMPTY(&rt_labels)) for (p = TAILQ_FIRST(&rt_labels); p != NULL && p->rtl_id == new_id; p = TAILQ_NEXT(p, rtl_entry)) new_id = p->rtl_id + 1; if (new_id > LABELID_MAX) return (0); label = (struct rt_label *)malloc(sizeof(struct rt_label), M_TEMP, M_NOWAIT); if (label == NULL) return (0); bzero(label, sizeof(struct rt_label)); strlcpy(label->rtl_name, name, sizeof(label->rtl_name)); label->rtl_id = new_id; label->rtl_ref++; if (p != NULL) /* insert new entry before p */ TAILQ_INSERT_BEFORE(p, label, rtl_entry); else /* either list empty or no free slot in between */ TAILQ_INSERT_TAIL(&rt_labels, label, rtl_entry); return (label->rtl_id); } const char * rtlabel_id2name(u_int16_t id) { struct rt_label *label; TAILQ_FOREACH(label, &rt_labels, rtl_entry) if (label->rtl_id == id) return (label->rtl_name); return (NULL); } void rtlabel_unref(u_int16_t id) { struct rt_label *p, *next; if (id == 0) return; for (p = TAILQ_FIRST(&rt_labels); p != NULL; p = next) { next = TAILQ_NEXT(p, rtl_entry); if (id == p->rtl_id) { if (--p->rtl_ref == 0) { TAILQ_REMOVE(&rt_labels, p, rtl_entry); free(p, M_TEMP); } break; } } } void rt_if_remove(struct ifnet *ifp) { int i; struct radix_node_head *rnh; for (i = 1; i <= AF_MAX; i++) if ((rnh = rt_gettable(i, 0)) != NULL) while ((*rnh->rnh_walktree)(rnh, rt_if_remove_rtdelete, ifp) == EAGAIN) ; /* nothing */ } /* * 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 rt_if_remove_rtdelete(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) == 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); }