/* $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $ */ /* * * Copyright (c) 1996 Charles D. Cranor and Washington University. * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Charles D. Cranor and * Washington University. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD: src/sys/netinet/if_atm.c,v 1.8.2.1 2001/12/20 10:30:18 ru Exp $ * $DragonFly: src/sys/netinet/if_atm.c,v 1.9 2006/12/22 23:57:52 swildner Exp $ */ /* * IP <=> ATM address resolution. */ #include "opt_inet.h" #include "opt_inet6.h" #include "opt_natm.h" #if defined(INET) || defined(INET6) #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef NATM #include #endif #define SDL(s) ((struct sockaddr_dl *)s) /* * atm_rtrequest: handle ATM rt request (in support of generic code) * inputs: "req" = request code * "rt" = route entry * "info" = rt_addrinfo */ void atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info) { struct sockaddr *gate = rt->rt_gateway; struct atm_pseudoioctl api; #ifdef NATM struct sockaddr_in *sin; struct natmpcb *npcb = NULL; struct atm_pseudohdr *aph; #endif static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; int error; if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */ return; switch (req) { case RTM_RESOLVE: /* resolve: only happens when cloning */ kprintf("atm_rtrequest: RTM_RESOLVE request detected?\n"); break; case RTM_ADD: /* * route added by a command (e.g. ifconfig, route, arp...). * * first check to see if this is not a host route, in which * case we are being called via "ifconfig" to set the address. */ if ((rt->rt_flags & RTF_HOST) == 0) { rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl); gate = rt->rt_gateway; SDL(gate)->sdl_type = rt->rt_ifp->if_type; SDL(gate)->sdl_index = rt->rt_ifp->if_index; break; } if ((rt->rt_flags & RTF_CLONING) != 0) { kprintf("atm_rtrequest: cloning route detected?\n"); break; } if (gate->sa_family != AF_LINK || gate->sa_len < sizeof(null_sdl)) { log(LOG_DEBUG, "atm_rtrequest: bad gateway value"); break; } #ifdef DIAGNOSTIC if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl"); #endif #ifdef NATM /* * let native ATM know we are using this VCI/VPI * (i.e. reserve it) */ sin = (struct sockaddr_in *) rt_key(rt); if (sin->sin_family != AF_INET) goto failed; aph = (struct atm_pseudohdr *) LLADDR(SDL(gate)); npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph), ATM_PH_VPI(aph)); if (npcb == NULL) goto failed; npcb->npcb_flags |= NPCB_IP; npcb->ipaddr.s_addr = sin->sin_addr.s_addr; /* XXX: move npcb to llinfo when ATM ARP is ready */ rt->rt_llinfo = npcb; rt->rt_flags |= RTF_LLINFO; #endif /* * let the lower level know this circuit is active */ bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph)); api.rxhand = NULL; lwkt_serialize_enter(rt->rt_ifp->if_serializer); error = rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, (caddr_t)&api, NULL); lwkt_serialize_exit(rt->rt_ifp->if_serializer); if (error) { kprintf("atm: couldn't add VC\n"); goto failed; } SDL(gate)->sdl_type = rt->rt_ifp->if_type; SDL(gate)->sdl_index = rt->rt_ifp->if_index; break; failed: #ifdef NATM if (npcb) { npcb_free(npcb, NPCB_DESTROY); rt->rt_llinfo = NULL; rt->rt_flags &= ~RTF_LLINFO; } #endif rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *) NULL, rt_mask(rt), 0, (struct rtentry **) NULL); break; case RTM_DELETE: #ifdef NATM /* * tell native ATM we are done with this VC */ if (rt->rt_flags & RTF_LLINFO) { npcb_free(rt->rt_llinfo, NPCB_DESTROY); rt->rt_llinfo = NULL; rt->rt_flags &= ~RTF_LLINFO; } #endif /* * tell the lower layer to disable this circuit */ bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph)); api.rxhand = NULL; lwkt_serialize_enter(rt->rt_ifp->if_serializer); rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, (caddr_t)&api, (struct ucred *)NULL); lwkt_serialize_exit(rt->rt_ifp->if_serializer); break; } } /* * atmresolve: * inputs: * [1] "rt" = the link level route to use (or null if need to look one up) * [2] "m" = mbuf containing the data to be sent * [3] "dst" = sockaddr_in (IP) address of dest. * output: * [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info * return: * 0 == resolve FAILED; note that "m" gets m_freem'd in this case * 1 == resolve OK; desten contains result * * XXX: will need more work if we wish to support ATMARP in the kernel, * but this is enough for PVCs entered via the "route" command. */ int atmresolve(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst, struct atm_pseudohdr *desten) { struct sockaddr_dl *sdl; if (m->m_flags & (M_BCAST|M_MCAST)) { log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped"); goto bad; } if (rt == NULL) { rt = RTALLOC1(dst, 0); if (rt == NULL) goto bad; /* failed */ rt->rt_refcnt--; /* don't keep LL references */ if ((rt->rt_flags & RTF_GATEWAY) != 0 || (rt->rt_flags & RTF_LLINFO) == 0 || /* XXX: are we using LLINFO? */ rt->rt_gateway->sa_family != AF_LINK) { goto bad; } } /* * note that rt_gateway is a sockaddr_dl which contains the * atm_pseudohdr data structure for this route. we currently * don't need any rt_llinfo info (but will if we want to support * ATM ARP [c.f. if_ether.c]). */ sdl = SDL(rt->rt_gateway); /* * Check the address family and length is valid, the address * is resolved; otherwise, try to resolve. */ if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) { bcopy(LLADDR(sdl), desten, sdl->sdl_alen); return(1); /* ok, go for it! */ } /* * we got an entry, but it doesn't have valid link address * info in it (it is prob. the interface route, which has * sdl_alen == 0). dump packet. (fall through to "bad"). */ bad: m_freem(m); return(0); } #endif /* INET */