2cf7873b92
We no longer need to change rtentry below if_output. The change makes it clear where rtentries are changed (or not) and helps forthcoming locking (os psrefing) rtentries.
262 lines
6.8 KiB
C
262 lines
6.8 KiB
C
/* $NetBSD: if_atm.c,v 1.38 2016/04/28 00:16:56 ozaki-r Exp $ */
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/*
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* Copyright (c) 1996 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* IP <=> ATM address resolution.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_atm.c,v 1.38 2016/04/28 00:16:56 ozaki-r Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_inet.h"
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#include "opt_natm.h"
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#endif
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#if defined(INET) || defined(INET6)
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/syslog.h>
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#include <sys/proc.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <net/if_atm.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/if_atm.h>
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#ifdef NATM
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#include <netnatm/natm.h>
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#endif
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/*
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* atm_rtrequest: handle ATM rt request (in support of generic code)
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* inputs: "req" = request code
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* "rt" = route entry
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* "sa" = sockaddr
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*/
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void
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atm_rtrequest(int req, struct rtentry *rt, const struct rt_addrinfo *info)
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{
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struct sockaddr *gate = rt->rt_gateway;
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struct atm_pseudoioctl api;
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#ifdef NATM
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const struct sockaddr_in *sin;
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struct natmpcb *npcb = NULL;
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const struct atm_pseudohdr *aph;
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#endif
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const struct ifnet *ifp = rt->rt_ifp;
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uint8_t namelen = strlen(ifp->if_xname);
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uint8_t addrlen = ifp->if_addrlen;
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if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */
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return;
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switch (req) {
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case RTM_ADD:
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/*
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* route added by a command (e.g. ifconfig, route, arp...).
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*
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* first check to see if this is not a host route, in which
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* case we are being called via "ifconfig" to set the address.
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*/
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if ((rt->rt_flags & RTF_HOST) == 0) {
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union {
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struct sockaddr sa;
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struct sockaddr_dl sdl;
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struct sockaddr_storage ss;
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} u;
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sockaddr_dl_init(&u.sdl, sizeof(u.ss),
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ifp->if_index, ifp->if_type,
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NULL, namelen, NULL, addrlen);
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rt_setgate(rt, &u.sa);
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gate = rt->rt_gateway;
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break;
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}
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if (gate->sa_family != AF_LINK ||
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gate->sa_len < sockaddr_dl_measure(namelen, addrlen)) {
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log(LOG_DEBUG, "atm_rtrequest: bad gateway value\n");
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break;
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}
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#ifdef DIAGNOSTIC
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if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
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#endif
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#ifdef NATM
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/*
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* let native ATM know we are using this VCI/VPI
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* (i.e. reserve it)
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*/
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sin = satocsin(rt_getkey(rt));
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if (sin->sin_family != AF_INET)
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goto failed;
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aph = (const struct atm_pseudohdr *)CLLADDR(satosdl(gate));
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npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
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ATM_PH_VPI(aph));
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if (npcb == NULL)
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goto failed;
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npcb->npcb_flags |= NPCB_IP;
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npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
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/* XXX: move npcb to llinfo when ATM ARP is ready */
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rt->rt_llinfo = (void *) npcb;
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#endif
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/*
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* let the lower level know this circuit is active
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*/
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memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
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api.rxhand = NULL;
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if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, &api) != 0) {
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printf("atm: couldn't add VC\n");
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goto failed;
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}
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satosdl(gate)->sdl_type = rt->rt_ifp->if_type;
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satosdl(gate)->sdl_index = rt->rt_ifp->if_index;
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break;
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failed:
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#ifdef NATM
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if (npcb) {
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npcb_free(npcb, NPCB_DESTROY);
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rt->rt_llinfo = NULL;
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}
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#endif
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rtrequest(RTM_DELETE, rt_getkey(rt), NULL,
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rt_mask(rt), 0, NULL);
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break;
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case RTM_DELETE:
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/*
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* tell the lower layer to disable this circuit
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*/
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memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
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api.rxhand = NULL;
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(void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, &api);
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break;
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}
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}
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/*
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* atmresolve:
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* inputs:
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* [1] "rt" = the link level route to use (or null if need to look one up)
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* [2] "m" = mbuf containing the data to be sent
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* [3] "dst" = sockaddr_in (IP) address of dest.
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* output:
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* [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
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* return:
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* 0 == resolve FAILED; note that "m" gets m_freem'd in this case
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* 1 == resolve OK; desten contains result
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*
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* XXX: will need more work if we wish to support ATMARP in the kernel,
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* but this is enough for PVCs entered via the "route" command.
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*/
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int
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atmresolve(const struct rtentry *rt0, struct mbuf *m, const struct sockaddr *dst,
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struct atm_pseudohdr *desten /* OUT */)
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{
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const struct sockaddr_dl *sdl;
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struct rtentry *rt = NULL;
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if (m->m_flags & (M_BCAST|M_MCAST)) {
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log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped\n");
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goto bad;
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}
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if (rt0 == NULL) {
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rt = RTALLOC1(dst, 0);
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if (rt == NULL)
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goto bad; /* failed */
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if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
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/* XXX: are we using LLINFO? */
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rt->rt_gateway->sa_family != AF_LINK) {
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rtfree(rt);
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goto bad;
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}
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}
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/*
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* note that rt_gateway is a sockaddr_dl which contains the
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* atm_pseudohdr data structure for this route. we currently
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* don't need any rt_llinfo info (but will if we want to support
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* ATM ARP [c.f. if_ether.c]).
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*/
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sdl = satocsdl((rt ? rt : rt0)->rt_gateway);
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/*
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* Check the address family and length is valid, the address
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* is resolved; otherwise, try to resolve.
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*/
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if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
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memcpy(desten, CLLADDR(sdl), sdl->sdl_alen);
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if (rt != NULL)
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rtfree(rt);
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return (1); /* ok, go for it! */
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}
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if (rt != NULL)
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rtfree(rt);
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/*
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* we got an entry, but it doesn't have valid link address
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* info in it (it is prob. the interface route, which has
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* sdl_alen == 0). dump packet. (fall through to "bad").
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*/
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bad:
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m_freem(m);
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return (0);
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}
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#endif /* INET */
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