/* $OpenBSD: route.c,v 1.50 2004/09/16 22:31:30 henning 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 NS #include #endif #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[AF_MAX+1]; int rttrash; /* routes not in table but not freed */ struct sockaddr wildcard; /* zero valued cookie for wildcard searches */ struct pool rtentry_pool; /* pool for rtentry structures */ struct pool rttimer_pool; /* pool for rttimer structures */ int okaytoclone(u_int, int); int rtdeletemsg(struct rtentry *); int rtflushclone1(struct radix_node *, void *); void rtflushclone(struct radix_node_head *, struct rtentry *); #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 void rtable_init(table) void **table; { struct domain *dom; for (dom = domains; dom != NULL; dom = dom->dom_next) if (dom->dom_rtattach) dom->dom_rtattach(&table[dom->dom_family], dom->dom_rtoffset); } void route_init() { pool_init(&rtentry_pool, sizeof(struct rtentry), 0, 0, 0, "rtentpl", NULL); rn_init(); /* initialize all zeroes, all ones, mask table */ rtable_init((void **)rt_tables); } void rtalloc_noclone(ro, howstrict) 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(flags, howstrict) 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(dst, report,howstrict) struct sockaddr *dst; int report,howstrict; { struct radix_node_head *rnh = rt_tables[dst->sa_family]; struct rtentry *rt; struct radix_node *rn; struct rtentry *newrt = 0; struct rt_addrinfo info; int s = splnet(), err = 0, msgtype = RTM_MISS; 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); 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, err); } } splx(s); return (newrt); } /* * Packet routing routines. */ void rtalloc(ro) 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); } struct rtentry * rtalloc1(dst, report) struct sockaddr *dst; int report; { struct radix_node_head *rnh = rt_tables[dst->sa_family]; struct rtentry *rt; struct radix_node *rn; struct rtentry *newrt = 0; struct rt_addrinfo info; int s = splsoftnet(), err = 0, msgtype = RTM_MISS; 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); 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, 0); } 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, err); } } splx(s); return (newrt); } void rtfree(rt) 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(ifa) 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(dst, gateway, netmask, flags, src, rtp) struct sockaddr *dst, *gateway, *netmask, *src; int flags; struct rtentry **rtp; { struct rtentry *rt; int error = 0; u_int32_t *stat = NULL; struct rt_addrinfo info; struct ifaddr *ifa; splassert(IPL_SOFTNET); /* verify the gateway is directly reachable */ if ((ifa = ifa_ifwithnet(gateway)) == NULL) { error = ENETUNREACH; goto out; } rt = rtalloc1(dst, 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); 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); } } 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, error); } /* * Delete a route and generate a message */ int rtdeletemsg(rt) struct rtentry *rt; { int error; struct rt_addrinfo info; /* * 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; error = rtrequest1(RTM_DELETE, &info, &rt); rt_missmsg(RTM_DELETE, &info, info.rti_flags, error); /* Adjust the refcount */ if (error == 0 && rt->rt_refcnt <= 0) { rt->rt_refcnt++; rtfree(rt); } return (error); } int rtflushclone1(rn, arg) 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); return 0; } void rtflushclone(rnh, parent) 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); } /* * Routing table ioctl interface. */ int rtioctl(req, data, p) u_long req; caddr_t data; struct proc *p; { return (EOPNOTSUPP); } struct ifaddr * ifa_ifwithroute(flags, dst, gateway) int flags; struct sockaddr *dst, *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); 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(req, dst, gateway, netmask, flags, ret_nrt) int req, flags; struct sockaddr *dst, *gateway, *netmask; struct rtentry **ret_nrt; { 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)); } /* * These (questionable) definitions of apparent local variables apply * to the next function. XXXXXX!!! */ #define dst info->rti_info[RTAX_DST] #define gateway info->rti_info[RTAX_GATEWAY] #define netmask info->rti_info[RTAX_NETMASK] #define ifaaddr info->rti_info[RTAX_IFA] #define ifpaddr info->rti_info[RTAX_IFP] #define flags info->rti_flags int rt_getifa(info) 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 && ifpaddr != NULL && ifpaddr->sa_family == AF_LINK && (ifa = ifa_ifwithnet((struct sockaddr *)ifpaddr)) != NULL) info->rti_ifp = ifa->ifa_ifp; if (info->rti_ifa == NULL && ifaaddr != NULL) info->rti_ifa = ifa_ifwithaddr(ifaaddr); if (info->rti_ifa == NULL) { struct sockaddr *sa; sa = ifaaddr != NULL ? ifaaddr : (gateway != NULL ? gateway : dst); if (sa != NULL && info->rti_ifp != NULL) info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp); else if (dst != NULL && gateway != NULL) info->rti_ifa = ifa_ifwithroute(flags, dst, gateway); else if (sa != NULL) info->rti_ifa = ifa_ifwithroute(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(req, info, ret_nrt) int req; struct rt_addrinfo *info; struct rtentry **ret_nrt; { 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_tables[dst->sa_family]) == 0) senderr(EAFNOSUPPORT); if (flags & RTF_HOST) netmask = 0; switch (req) { case RTM_DELETE: if ((rn = rnh->rnh_lookup(dst, 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, gateway); rn = (struct radix_node *)rt; if (!rt) senderr(ESRCH); } #endif if ((rn = rnh->rnh_deladdr(dst, netmask, rnh, rn)) == NULL) senderr(ESRCH); rt = (struct rtentry *)rn; if ((rt->rt_flags & RTF_CLONING) != 0) { /* clean up any cloned children */ rtflushclone(rnh, rt); } if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT)) panic ("rtrequest delete"); rt = (struct rtentry *)rn; 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; } 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; flags = rt->rt_flags & ~(RTF_CLONING | RTF_STATIC); flags |= RTF_CLONED; gateway = rt->rt_gateway; if ((netmask = rt->rt_genmask) == NULL) 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 | flags; LIST_INIT(&rt->rt_timer); if (rt_setgate(rt, dst, gateway)) { pool_put(&rtentry_pool, rt); senderr(ENOBUFS); } ndst = rt_key(rt); if (netmask) { rt_maskedcopy(dst, ndst, netmask); } else Bcopy(dst, ndst, 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, netmask, 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)netmask, rnh, rt->rt_nodes); if (rn == NULL && (crt = rtalloc1(ndst, 0)) != NULL) { /* overwrite cloned route */ if ((crt->rt_flags & RTF_CLONED) != 0) { rtdeletemsg(crt); rn = rnh->rnh_addaddr((caddr_t)ndst, (caddr_t)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); } 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); } break; } bad: splx(s); return (error); } #undef dst #undef gateway #undef netmask #undef ifaaddr #undef ifpaddr #undef flags int rt_setgate(rt0, dst, gate) struct rtentry *rt0; struct sockaddr *dst, *gate; { 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); /* * 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(src, dst, netmask) struct sockaddr *src, *dst, *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(ifa, cmd, flags) struct ifaddr *ifa; int cmd, flags; { struct rtentry *rt; struct sockaddr *dst; struct sockaddr *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)) != 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); 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); \ } \ } /* * 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; KASSERT(rt_init_done == 0); 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(timeout) 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(rtq, timeout) struct rttimer_queue *rtq; long timeout; { rtq->rtq_timeout = timeout; } void rt_timer_queue_destroy(rtq, 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(rtq) struct rttimer_queue *rtq; { return (rtq->rtq_count); } void rt_timer_remove_all(rt) 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(rt, func, queue) struct rtentry *rt; void(*func)(struct rtentry *, struct rttimer *); struct rttimer_queue *queue; { struct rttimer *r; long current_time; current_time = time_uptime; /* * 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); } /* ARGSUSED */ void rt_timer_timer(arg) 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; 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; } } }