ip_output.c
上传用户:nvosite88
上传日期:2007-01-17
资源大小:4983k
文件大小:43k
- /* ip_output.c - internet output routines */
- /* Copyright 1984 - 2001 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- * Copyright (c) 1982, 1986, 1988, 1990, 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- *
- * @(#)ip_output.c 8.3 (Berkeley) 1/21/94
- */
- /*
- modification history
- --------------------
- 01t,22mar02,wap export ip_mloopback() so that ipOutput() can use it (SPR
- #72246)
- 01s,29oct01,wap Fixed mbuf leak in ip_output() (SPR #67966)
- 01r,12oct01,rae merge from truestack ver 01w, base 01o (SPR #69683 etc.)
- 01q,07dec00,rae Add IPsec output hook
- 01p,17nov00,rae allow IP_DROP_MEMBERSHIP with INADDR_ANY (SPR# 33093)
- 01o,03sep98,n_s fixed fragmentation problem for mcast and bcast. spr #21071.
- 01n,26aug98,n_s added return val check for mBufClGet in ip_ctloutput and
- ip_getmoptions. spr #22238.
- 01m,09jan98,vin changed IP_CKSUM_SEND_MASK to IP_DO_CHECKSUM_SND
- 01l,08dec97,vin fixed ip_freemoptions() SPR 9970.
- 01k,19nov97,vin changed extern declaration of _ipCfgFlags to int from UCHAR.
- 01j,13nov97,vin provided an additional flag for sending large BCAST pkts.
- 01i,05oct97,vin added fast multicasting.
- 01h,15jul97,spm made IP checksum calculation configurable (SPR #7836)
- 01g,08mar97,vin added mCastRouteFwdHook to access mcast routing code.
- 01f,24mar97,vin bug fixed in ip_mloopback() ip hdr being shared, SPR8252
- 01e,13feb97,rjc fixed bad parameter to TOS_SET
- 01d,05feb97,rjc changes for tos routing and fix for multicast bug.
- 01c,05dec96,vin changed malloc(..) to MALLOC(..) to use only network buffers,
- changed free(..) to FREE(..).
- 01b,22nov96,vin added cluster support replaced m_get(..) with mBufClGet(..)
- replaced m_gethdr with mHdrClGet(..)
- 01a,03mar96,vin created from BSD4.4 stuff,integrated with 02n of ip_output.c
- */
- #include "vxWorks.h"
- #include "netLib.h"
- #include "net/mbuf.h"
- #include "errno.h"
- #include "net/protosw.h"
- #include "sys/socket.h"
- #include "sys/ioctl.h"
- #include "net/socketvar.h"
- #include "net/if.h"
- #include "net/if_types.h"
- #include "net/route.h"
- #include "netinet/in.h"
- #include "netinet/in_pcb.h"
- #include "netinet/in_systm.h"
- #include "netinet/in_var.h"
- #include "netinet/ip.h"
- #include "netinet/ip_var.h"
- #include "net/systm.h"
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET
- #include "wvNetLib.h"
- #endif
- #endif
- /*IPsec output hook defined in /target/src/wrn/ipsec/ipsec_io.c */
- typedef int (*IPSEC_OUTPUT_FUNCPTR) (struct mbuf** m0,
- struct mbuf* opt,
- struct route* ro, int flags,
- struct ip_moptions* imo,struct sockaddr_in* dst,
- struct in_ifaddr* ia);
- IPSEC_OUTPUT_FUNCPTR _func_ipsecOutput;
- #ifdef VIRTUAL_STACK
- #include "netinet/vsLib.h"
- #include "netinet/vsMcast.h"
- #endif
- /* externs */
- #ifndef VIRTUAL_STACK
- IMPORT int _ipCfgFlags; /* Calculate IP checksum? */
- extern FUNCPTR _mCastRouteFwdHook; /* WRS mcast forward command hook */
- #endif /* VIRTUAL_STACK */
- extern int looutput();
- static struct mbuf *ip_insertoptions (struct mbuf *, struct mbuf *, int *);
- void ip_mloopback (struct ifnet *, struct mbuf *, struct sockaddr_in *,
- struct rtentry *rt);
- static int ip_setmoptions (int, struct inpcb *, struct mbuf *);
- /* locals */
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET
- /* Set common fields of event identifiers for this module. */
- LOCAL UCHAR wvNetModuleId = WV_NET_IPOUTPUT_MODULE; /* Value for ip_output.c */
- LOCAL UCHAR wvNetLocalFilter = WV_NET_NONE; /* Available event filter */
- LOCAL ULONG wvNetEventId; /* Event identifier: see wvNetLib.h */
- #endif /* INCLUDE_WVNET */
- #endif
- /*
- * IP output. The packet in mbuf chain m contains a skeletal IP
- * header (with len, off, ttl, proto, tos, src, dst).
- * The mbuf chain containing the packet will be freed.
- * The mbuf opt, if present, will not be freed.
- */
- int
- ip_output(m0, opt, ro, flags, imo)
- struct mbuf *m0;
- struct mbuf *opt;
- struct route *ro;
- int flags;
- struct ip_moptions *imo;
- {
- register struct ip *ip, *mhip;
- register struct ifnet *ifp = NULL;
- register struct mbuf *m = m0;
- register int hlen = sizeof (struct ip);
- int len, off, error = 0;
- struct route iproute;
- struct sockaddr_in *dst;
- MTU_QUERY mtuQuery;
- int mtu = 0;
- struct in_ifaddr *ia = NULL;
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET
- u_long srcAddr; /* Source IP address, unavailable when finished */
- u_long dstAddr; /* Dest. IP address, unavailable when finished */
- #endif
- #endif
- #ifdef DIAGNOSTIC
- if ((m->m_flags & M_PKTHDR) == 0)
- panic("ip_output no HDR");
- #endif
- if (opt) {
- m = ip_insertoptions(m, opt, &len);
- hlen = len;
- }
- ip = mtod(m, struct ip *);
- /*
- * Fill in IP header.
- */
- if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
- ip->ip_v = IPVERSION;
- ip->ip_off &= IP_DF;
- #ifdef VIRTUAL_STACK
- ip->ip_id = htons(_ip_id++);
- #else
- ip->ip_id = htons(ip_id++);
- #endif /* VIRTUAL_STACK */
- ip->ip_hl = hlen >> 2;
- #ifdef VIRTUAL_STACK
- _ipstat.ips_localout++;
- #else
- ipstat.ips_localout++;
- #endif /* VIRTUAL_STACK */
- } else {
- hlen = ip->ip_hl << 2;
- }
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET
- /*
- * Save the source and destination address from the original packet,
- * since they will be unavailable at the "done:" label.
- */
- srcAddr = ip->ip_src.s_addr;
- dstAddr = ip->ip_dst.s_addr;
- #endif
- #endif
- /*
- * Route packet.
- */
- if (ro == 0) {
- ro = &iproute;
- bzero((caddr_t)ro, sizeof (*ro));
- }
- dst = (struct sockaddr_in *)&ro->ro_dst;
- /*
- * If there is a cached route,
- * check that it is to the same destination
- * and is still up. If not, free it and try again.
- */
- if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
- dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_VERBOSE event */
- WV_NET_DSTADDROUT_EVENT_2 (NET_CORE_EVENT, WV_NET_VERBOSE, 57, 8,
- ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_CACHEMISS, WV_NET_SEND,
- ip->ip_dst.s_addr, dst->sin_addr.s_addr)
- #endif /* INCLUDE_WVNET */
- #endif
- RTFREE(ro->ro_rt);
- ro->ro_rt = (struct rtentry *)0;
- }
- if (ro->ro_rt == 0) {
- dst->sin_family = AF_INET;
- dst->sin_len = sizeof(*dst);
- dst->sin_addr = ip->ip_dst;
- TOS_SET (dst, ip->ip_tos);
- }
- /*
- * If routing to interface only,
- * short circuit routing lookup.
- */
- #define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
- #define sintosa(sin) ((struct sockaddr *)(sin))
- if (flags & IP_ROUTETOIF ) {
- if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 &&
- (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_DSTADDROUT_EVENT_1 (NET_CORE_EVENT, WV_NET_CRITICAL, 20, 1,
- ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_BADADDR, WV_NET_SEND,
- dst->sin_addr.s_addr)
- #endif /* INCLUDE_WVNET */
- #endif
-
- #ifdef VIRTUAL_STACK
- _ipstat.ips_noroute++;
- #else
- ipstat.ips_noroute++;
- #endif /* VIRTUAL_STACK */
- error = ENETUNREACH;
- goto bad;
- }
- ifp = ia->ia_ifp;
- ip->ip_ttl = 1;
- } else if (! (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) && imo &&
- ((imo->imo_multicast_ifp != NULL)))) {
- if (ro->ro_rt == 0)
- rtalloc(ro);
- if (ro->ro_rt == 0) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_DSTADDROUT_EVENT_1 (NET_CORE_EVENT, WV_NET_CRITICAL, 20, 1,
- ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_BADADDR, WV_NET_SEND,
- dst->sin_addr.s_addr)
- #endif /* INCLUDE_WVNET */
- #endif
- #ifdef VIRTUAL_STACK
- _ipstat.ips_noroute++;
- #else
- ipstat.ips_noroute++;
- #endif /* VIRTUAL_STACK */
- error = EHOSTUNREACH;
- goto bad;
- }
- ia = ifatoia(ro->ro_rt->rt_ifa);
- ifp = ro->ro_rt->rt_ifp;
- ro->ro_rt->rt_use++;
- if (ro->ro_rt->rt_flags & RTF_GATEWAY)
- dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
- }
- if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
- struct in_multi *inm;
- #ifndef VIRTUAL_STACK
- extern struct ifnet loif[];
- #endif /* VIRTUAL_STACK */
- m->m_flags |= M_MCAST;
- /*
- * IP destination address is multicast. Make sure "dst"
- * still points to the address in "ro". (It may have been
- * changed to point to a gateway address, above.)
- */
- dst = (struct sockaddr_in *)&ro->ro_dst;
- if (imo && imo->imo_multicast_ifp != NULL)
- {
- register struct in_ifaddr *ia;
- #ifdef VIRTUAL_STACK
- for (ia = _in_ifaddr; ia; ia = ia->ia_next)
- #else
- for (ia = in_ifaddr; ia; ia = ia->ia_next)
- #endif /* VIRTUAL_STACK */
- if (ia->ia_ifp == ifp)
- {
- dst->sin_addr.s_addr = IA_SIN(ia)->sin_addr.s_addr;
- break;
- }
- if (ro->ro_rt)
- {
- RTFREE(ro->ro_rt);
- ro->ro_rt = (struct rtentry *)0;
- }
- }
- /*
- * See if the caller provided any multicast options
- */
- if (imo != NULL) {
- ip->ip_ttl = imo->imo_multicast_ttl;
- if (imo->imo_multicast_ifp != NULL)
- ifp = imo->imo_multicast_ifp;
- } else
- ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
- /*
- * Confirm that the outgoing interface supports multicast.
- */
- if ((ifp->if_flags & IFF_MULTICAST) == 0) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_DSTADDROUT_EVENT_2 (NET_CORE_EVENT, WV_NET_CRITICAL, 21, 2,
- ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_BADFLAGS, WV_NET_SEND,
- dst->sin_addr.s_addr, ifp)
- #endif /* INCLUDE_WVNET */
- #endif
- #ifdef VIRTUAL_STACK
- _ipstat.ips_noroute++;
- #else
- ipstat.ips_noroute++;
- #endif /* VIRTUAL_STACK */
- error = ENETUNREACH;
- goto bad;
- }
- /*
- * If source address not specified yet, use address
- * of outgoing interface.
- */
- if (ip->ip_src.s_addr == INADDR_ANY) {
- register struct in_ifaddr *ia;
- #ifdef VIRTUAL_STACK
- for (ia = _in_ifaddr; ia; ia = ia->ia_next)
- #else
- for (ia = in_ifaddr; ia; ia = ia->ia_next)
- #endif /* VIRTUAL_STACK */
- if (ia->ia_ifp == ifp) {
- ip->ip_src = IA_SIN(ia)->sin_addr;
- break;
- }
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET
- /*
- * Update the source destination address if not previously
- * specified, since it will be unavailable at the "done:" label.
- */
- srcAddr = ip->ip_src.s_addr;
- #endif
- #endif
- }
- IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm);
- if (inm != NULL &&
- (imo == NULL || imo->imo_multicast_loop)) {
- /*
- * If we belong to the destination multicast group
- * on the outgoing interface, and the caller did not
- * forbid loopback, loop back a copy.
- */
- ip_mloopback(ifp, m, dst, NULL);
- }
- else {
- /*
- * If we are acting as a multicast router, perform
- * multicast forwarding as if the packet had just
- * arrived on the interface to which we are about
- * to send. The multicast forwarding function
- * recursively calls this function, using the
- * IP_FORWARDING flag to prevent infinite recursion.
- *
- * Multicasts that are looped back by ip_mloopback(),
- * above, will be forwarded by the ip_input() routine,
- * if necessary.
- */
- if ((_mCastRouteFwdHook != NULL) &&
- ((flags & IP_FORWARDING) == 0)) {
- if ((*_mCastRouteFwdHook)(m, ifp, ip, NULL) != 0) {
- m_freem(m);
- goto done;
- }
- }
- }
- /*
- * Multicasts with a time-to-live of zero may be looped-
- * back, above, but must not be transmitted on a network.
- * Also, multicasts addressed to the loopback interface
- * are not sent -- the above call to ip_mloopback() will
- * loop back a copy if this host actually belongs to the
- * destination group on the loopback interface.
- */
- if (ip->ip_ttl == 0 || ifp == loif) {
- m_freem(m);
- goto done;
- }
- /*
- * Use the predefined MTU size for outgoing packets. The
- * point-to-multipoint devices which permit a different
- * value do not support multicast addresses.
- */
- mtu = ifp->if_mtu;
- goto sendit;
- }
- #ifndef notdef
- /*
- * If source address not specified yet, use address
- * of outgoing interface.
- */
- if (ip->ip_src.s_addr == INADDR_ANY)
- ip->ip_src = IA_SIN(ia)->sin_addr;
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET
- /*
- * Update the source destination address if not previously
- * specified, since it will be unavailable at the "done:" label.
- */
- srcAddr = ip->ip_src.s_addr;
- #endif
- #endif
- #endif
- /*
- * Get the MTU size. Point-to-multipoint devices allow a separate
- * MTU for each destination address. All other devices use a
- * predefined size.
- */
- if (ifp->if_type == IFT_PMP)
- {
- /*
- * The SIOCGMTU operation reads the address from the
- * argument and returns the corresponding MTU size.
- */
- mtuQuery.family = AF_INET;
- mtuQuery.dstIpAddr = dst->sin_addr.s_addr;
- error = ifp->if_ioctl (ifp, SIOCGMTU, (caddr_t)&mtuQuery);
- if (error)
- {
- error = EHOSTUNREACH;
- goto bad;
- }
- mtu = mtuQuery.mtu;
- }
- else
- mtu = ifp->if_mtu;
- /*
- * Look for broadcast address and
- * and verify user is allowed to send
- * such a packet.
- */
- if (in_broadcast(dst->sin_addr, ifp)) {
- if ((ifp->if_flags & IFF_BROADCAST) == 0) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_ADDROUT_EVENT_2 (NET_CORE_EVENT, WV_NET_CRITICAL, 21, 2,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_BADFLAGS, WV_NET_SEND,
- dst->sin_addr.s_addr, ifp)
- #endif /* INCLUDE_WVNET */
- #endif
- error = EADDRNOTAVAIL;
- goto bad;
- }
- if ((flags & IP_ALLOWBROADCAST) == 0) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_ADDROUT_EVENT_2 (NET_CORE_EVENT, WV_NET_CRITICAL, 21, 2,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_BADFLAGS, WV_NET_SEND,
- dst->sin_addr.s_addr, 0)
- #endif /* INCLUDE_WVNET */
- #endif
- error = EACCES;
- goto bad;
- }
- /* allow broadcast messages to be fragmented if flag set */
- if (((u_short)ip->ip_len > mtu) &&
- !(_ipCfgFlags & IP_DO_LARGE_BCAST)) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_ADDROUT_EVENT_2 (NET_CORE_EVENT, WV_NET_CRITICAL, 22, 3,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_CANTFRAG, WV_NET_SEND,
- dst->sin_addr.s_addr, ifp)
- #endif /* INCLUDE_WVNET */
- #endif
- error = EMSGSIZE;
- goto bad;
- }
- m->m_flags |= M_BCAST;
- } else
- m->m_flags &= ~M_BCAST;
- sendit:
- if (_func_ipsecOutput != NULL)
- {
- /* Deliver the packet to ipsec for further processing/filtering. */
- error = _func_ipsecOutput (&m0, opt, ro, flags, imo, dst, ia);
- m = m0;
- ip = mtod(m, struct ip *);
- if (error != 0)
- {
- /* If there is an error we should have already freed the packet */
- if (error == ERROR)
- {
- /* Unless the error is very specific we do not propagate the error; so we reset it */
- error = OK;
- }
- goto done;
- }
- }
- /*
- * If small enough for interface, can just send directly.
- */
- if ((u_short)ip->ip_len <= mtu) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_INFO event */
- WV_NET_ADDROUT_EVENT_4 (NET_CORE_EVENT, WV_NET_INFO, 54, 10,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_SENDALL, WV_NET_SEND,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- (u_long)ip->ip_len, mtu)
- #endif /* INCLUDE_WVNET */
- #endif
- ip->ip_len = htons((u_short)ip->ip_len);
- ip->ip_off = htons((u_short)ip->ip_off);
- ip->ip_sum = 0;
- if (_ipCfgFlags & IP_DO_CHECKSUM_SND)
- ip->ip_sum = in_cksum(m, hlen);
- error = (*ifp->if_output)(ifp, m,
- (struct sockaddr *)dst, ro->ro_rt);
- goto done;
- }
- /*
- * Too large for interface; fragment if possible.
- * Must be able to put at least 8 bytes per fragment.
- */
- if (ip->ip_off & IP_DF) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_ADDROUT_EVENT_2 (NET_CORE_EVENT, WV_NET_CRITICAL, 22, 3,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_CANTFRAG, WV_NET_SEND,
- dst->sin_addr.s_addr, ifp)
- #endif /* INCLUDE_WVNET */
- #endif
- error = EMSGSIZE;
- /*
- * If the interface is using a new (smaller) MTU size than
- * originally assigned, update the current path MTU estimate
- * (if any) to the new (largest possible) value.
- */
- if (ro->ro_rt && (ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
- && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
- && (ro->ro_rt->rt_rmx.rmx_mtu > mtu))
- {
- ro->ro_rt->rt_rmx.rmx_mtu = mtu;
- }
- #ifdef VIRTUAL_STACK
- _ipstat.ips_cantfrag++;
- #else
- ipstat.ips_cantfrag++;
- #endif /* VIRTUAL_STACK */
- goto bad;
- }
- len = (mtu - hlen) &~ 7;
- if (len < 8) {
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_CRITICAL event */
- WV_NET_ADDROUT_EVENT_2 (NET_CORE_EVENT, WV_NET_CRITICAL, 23, 4,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_SHORTMSG, WV_NET_SEND,
- dst->sin_addr.s_addr, ifp)
- #endif /* INCLUDE_WVNET */
- #endif
- error = EMSGSIZE;
- goto bad;
- }
- {
- int mhlen, firstlen = len;
- struct mbuf **mnext = &m->m_nextpkt;
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_INFO event */
- WV_NET_ADDROUT_EVENT_4 (NET_CORE_EVENT, WV_NET_INFO, 55, 11,
- ip->ip_src.s_addr, ip->ip_dst.s_addr,
- WV_NETEVENT_IPOUT_SENDFRAG, WV_NET_SEND,
- dst->sin_addr.s_addr, (u_long)ip->ip_len,
- hlen, mtu);
- #endif /* INCLUDE_WVNET */
- #endif
- /*
- * Loop through length of segment after first fragment,
- * make new header and copy data of each part and link onto chain.
- */
- m0 = m;
- mhlen = sizeof (struct ip);
- for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
- m= mHdrClGet(M_DONTWAIT, MT_HEADER, CL_SIZE_128, TRUE);
- if (m == 0) {
- error = ENOBUFS;
- #ifdef VIRTUAL_STACK
- _ipstat.ips_odropped++;
- #else
- ipstat.ips_odropped++;
- #endif /* VIRTUAL_STACK */
- goto sendorfree;
- }
- m->m_flags = m0->m_flags;
- m->m_data += max_linkhdr;
- mhip = mtod(m, struct ip *);
- *mhip = *ip;
- if (hlen > sizeof (struct ip)) {
- mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
- mhip->ip_hl = mhlen >> 2;
- }
- m->m_len = mhlen;
- mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
- if (ip->ip_off & IP_MF)
- mhip->ip_off |= IP_MF;
- if (off + len >= (u_short)ip->ip_len)
- len = (u_short)ip->ip_len - off;
- else
- mhip->ip_off |= IP_MF;
- mhip->ip_len = htons((u_short)(len + mhlen));
- m->m_next = m_copy(m0, off, len);
- if (m->m_next == 0) {
- (void) m_free(m);
- error = ENOBUFS; /* ??? */
- #ifdef VIRTUAL_STACK
- _ipstat.ips_odropped++;
- #else
- ipstat.ips_odropped++;
- #endif /* VIRTUAL_STACK */
- goto sendorfree;
- }
- m->m_pkthdr.len = mhlen + len;
- m->m_pkthdr.rcvif = (struct ifnet *)0;
- mhip->ip_off = htons((u_short)mhip->ip_off);
- mhip->ip_sum = 0;
- if (_ipCfgFlags & IP_DO_CHECKSUM_SND)
- mhip->ip_sum = in_cksum(m, mhlen);
- *mnext = m;
- mnext = &m->m_nextpkt;
- #ifdef VIRTUAL_STACK
- _ipstat.ips_ofragments++;
- #else
- ipstat.ips_ofragments++;
- #endif /* VIRTUAL_STACK */
- }
- /*
- * Update first fragment by trimming what's been copied out
- * and updating header, then send each fragment (in order).
- */
- m = m0;
- m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
- m->m_pkthdr.len = hlen + firstlen;
- ip->ip_len = htons((u_short)m->m_pkthdr.len);
- ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
- ip->ip_sum = 0;
- if (_ipCfgFlags & IP_DO_CHECKSUM_SND)
- ip->ip_sum = in_cksum(m, hlen);
- sendorfree:
- for (m = m0; m; m = m0) {
- m0 = m->m_nextpkt;
- m->m_nextpkt = 0;
- if (error == 0)
- error = (*ifp->if_output)(ifp, m,
- (struct sockaddr *)dst, ro->ro_rt);
- else
- m_freem(m);
- }
- if (error == 0)
- #ifdef VIRTUAL_STACK
- _ipstat.ips_fragmented++;
- #else
- ipstat.ips_fragmented++;
- #endif /* VIRTUAL_STACK */
- }
- done:
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_ERROR event */
- WV_NET_ADDROUT_EVENT_4 (NET_CORE_EVENT, WV_NET_ERROR, 31, 9,
- srcAddr, dstAddr,
- WV_NETEVENT_IPOUT_FINISH, WV_NET_SEND,
- error, ifp, srcAddr, dstAddr)
- #endif /* INCLUDE_WVNET */
- #endif
- if ((ro == &iproute) && ((flags & IP_ROUTETOIF) == 0) && ro->ro_rt) {
- RTFREE(ro->ro_rt);
- }
- return (error);
- bad:
- m_freem(m);
- goto done;
- }
- /*
- * Insert IP options into preformed packet.
- * Adjust IP destination as required for IP source routing,
- * as indicated by a non-zero in_addr at the start of the options.
- */
- static struct mbuf *
- ip_insertoptions(m, opt, phlen)
- register struct mbuf *m;
- struct mbuf *opt;
- int *phlen;
- {
- register struct ipoption *p = mtod(opt, struct ipoption *);
- struct mbuf *n;
- register struct ip *ip = mtod(m, struct ip *);
- unsigned optlen;
- optlen = opt->m_len - sizeof(p->ipopt_dst);
- if (optlen + (u_short)ip->ip_len > IP_MAXPACKET)
- return (m); /* XXX should fail */
- if (p->ipopt_dst.s_addr)
- ip->ip_dst = p->ipopt_dst;
- #if 0 /* XXX changed for default cluster support vinai
- * The reason why always new clusters are allocted,
- * is that, data could be overwritten since clusters are shared.
- */
- if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
- #endif
- n = mHdrClGet(M_DONTWAIT, MT_HEADER, CL_SIZE_128, TRUE);
- if (n == 0)
- return (m);
- n->m_pkthdr.len = m->m_pkthdr.len + optlen;
- m->m_len -= sizeof(struct ip);
- m->m_data += sizeof(struct ip);
- n->m_next = m;
- m = n;
- m->m_len = optlen + sizeof(struct ip);
- m->m_data += max_linkhdr;
- bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
- #if 0 /* XXX changed for default cluster support vinai */
- } else {
- m->m_data -= optlen;
- m->m_len += optlen;
- m->m_pkthdr.len += optlen;
- ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
- }
- #endif
- ip = mtod(m, struct ip *);
- bcopy((caddr_t)p->ipopt_list, (caddr_t)(ip + 1), (unsigned)optlen);
- *phlen = sizeof(struct ip) + optlen;
- ip->ip_len += optlen;
- return (m);
- }
- /*
- * Copy options from ip to jp,
- * omitting those not copied during fragmentation.
- */
- int
- ip_optcopy(ip, jp)
- struct ip *ip, *jp;
- {
- register u_char *cp, *dp;
- int opt, optlen, cnt;
- cp = (u_char *)(ip + 1);
- dp = (u_char *)(jp + 1);
- cnt = (ip->ip_hl << 2) - sizeof (struct ip);
- for (; cnt > 0; cnt -= optlen, cp += optlen) {
- opt = cp[0];
- if (opt == IPOPT_EOL)
- break;
- if (opt == IPOPT_NOP) {
- /* Preserve for IP mcast tunnel's LSRR alignment. */
- *dp++ = IPOPT_NOP;
- optlen = 1;
- continue;
- } else
- optlen = cp[IPOPT_OLEN];
- /* bogus lengths should have been caught by ip_dooptions */
- if (optlen > cnt)
- optlen = cnt;
- if (IPOPT_COPIED(opt)) {
- bcopy((caddr_t)cp, (caddr_t)dp, (unsigned)optlen);
- dp += optlen;
- }
- }
- for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++)
- *dp++ = IPOPT_EOL;
- return (optlen);
- }
- /*
- * IP socket option processing.
- */
- int
- ip_ctloutput(op, so, level, optname, mp)
- int op;
- struct socket *so;
- int level, optname;
- struct mbuf **mp;
- {
- register struct inpcb *inp = sotoinpcb(so);
- register struct mbuf *m = *mp;
- register int optval = 0;
- int error = 0;
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_INFO event */
- WV_NET_MARKER_4 (NET_AUX_EVENT, WV_NET_INFO, 11, 6,
- WV_NETEVENT_IPOUTCTRL_START,
- so->so_fd, op, level, optname)
- #endif /* INCLUDE_WVNET */
- #endif
- if (level != IPPROTO_IP) {
- error = EINVAL;
- if (op == PRCO_SETOPT && *mp)
- (void) m_free(*mp);
- } else switch (op) {
- case PRCO_SETOPT:
- switch (optname) {
- case IP_OPTIONS:
- #ifdef notyet
- case IP_RETOPTS:
- return (ip_pcbopts(optname, &inp->inp_options, m));
- #else
- return (ip_pcbopts(&inp->inp_options, m));
- #endif
- case IP_TOS:
- case IP_TTL:
- case IP_RECVOPTS:
- case IP_RECVRETOPTS:
- case IP_RECVDSTADDR:
- if (m->m_len != sizeof(int))
- error = EINVAL;
- else {
- optval = *mtod(m, int *);
- switch (optname) {
- case IP_TOS:
- inp->inp_ip.ip_tos = optval;
- break;
- case IP_TTL:
- inp->inp_ip.ip_ttl = optval;
- break;
- #define OPTSET(bit)
- if (optval)
- inp->inp_flags |= bit;
- else
- inp->inp_flags &= ~bit;
- case IP_RECVOPTS:
- OPTSET(INP_RECVOPTS);
- break;
- case IP_RECVRETOPTS:
- OPTSET(INP_RECVRETOPTS);
- break;
- case IP_RECVDSTADDR:
- OPTSET(INP_RECVDSTADDR);
- break;
- }
- }
- break;
- #undef OPTSET
- case IP_MULTICAST_IF:
- case IP_MULTICAST_TTL:
- case IP_MULTICAST_LOOP:
- case IP_ADD_MEMBERSHIP:
- case IP_DROP_MEMBERSHIP:
- error = ip_setmoptions(optname, inp, m);
- break;
- default:
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_ERROR event */
- WV_NET_MARKER_4 (NET_AUX_EVENT, WV_NET_ERROR, 30, 5,
- WV_NETEVENT_IPOUTCTRL_BADCMD,
- so->so_fd, op, level, optname)
- #endif /* INCLUDE_WVNET */
- #endif
- error = ENOPROTOOPT;
- break;
- }
- if (m)
- (void)m_free(m);
- break;
- case PRCO_GETOPT:
- switch (optname) {
- case IP_OPTIONS:
- case IP_RETOPTS:
- *mp = m = mBufClGet(M_WAIT, MT_SOOPTS, CL_SIZE_128,
- TRUE);
- if (m == NULL)
- {
- error = ENOBUFS;
- break;
- }
- if (inp->inp_options) {
- m->m_len = inp->inp_options->m_len;
- bcopy(mtod(inp->inp_options, caddr_t),
- mtod(m, caddr_t), (unsigned)m->m_len);
- } else
- m->m_len = 0;
- break;
- case IP_TOS:
- case IP_TTL:
- case IP_RECVOPTS:
- case IP_RECVRETOPTS:
- case IP_RECVDSTADDR:
- *mp = m = mBufClGet(M_WAIT, MT_SOOPTS, CL_SIZE_128,
- TRUE);
- if (m == NULL)
- {
- error = ENOBUFS;
- break;
- }
- m->m_len = sizeof(int);
- switch (optname) {
- case IP_TOS:
- optval = inp->inp_ip.ip_tos;
- break;
- case IP_TTL:
- optval = inp->inp_ip.ip_ttl;
- break;
- #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0)
- case IP_RECVOPTS:
- optval = OPTBIT(INP_RECVOPTS);
- break;
- case IP_RECVRETOPTS:
- optval = OPTBIT(INP_RECVRETOPTS);
- break;
- case IP_RECVDSTADDR:
- optval = OPTBIT(INP_RECVDSTADDR);
- break;
- }
- *mtod(m, int *) = optval;
- break;
- case IP_MULTICAST_IF:
- case IP_MULTICAST_TTL:
- case IP_MULTICAST_LOOP:
- case IP_ADD_MEMBERSHIP:
- case IP_DROP_MEMBERSHIP:
- error = ip_getmoptions(optname, inp->inp_moptions, mp);
- break;
- default:
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_ERROR event */
- WV_NET_MARKER_4 (NET_AUX_EVENT, WV_NET_ERROR, 30, 5,
- WV_NETEVENT_IPOUTCTRL_BADCMD,
- so->so_fd, op, level, optname)
- #endif /* INCLUDE_WVNET */
- #endif
- error = ENOPROTOOPT;
- break;
- }
- break;
- }
- return (error);
- }
- /*
- * Set up IP options in pcb for insertion in output packets.
- * Store in mbuf with pointer in pcbopt, adding pseudo-option
- * with destination address if source routed.
- */
- int
- #ifdef notyet
- ip_pcbopts(optname, pcbopt, m)
- int optname;
- #else
- ip_pcbopts(pcbopt, m)
- #endif
- struct mbuf **pcbopt;
- register struct mbuf *m;
- {
- register int cnt, optlen;
- register u_char *cp;
- u_char opt;
- /* turn off any old options */
- if (*pcbopt)
- (void)m_free(*pcbopt);
- *pcbopt = 0;
- if (m == (struct mbuf *)0 || m->m_len == 0) {
- /*
- * Only turning off any previous options.
- */
- if (m)
- (void)m_free(m);
- return (0);
- }
- #ifndef vax
- if (m->m_len % sizeof(long))
- goto bad;
- #endif
- /*
- * IP first-hop destination address will be stored before
- * actual options; move other options back
- * and clear it when none present.
- */
- #if 0 /*XXX changed for default cluster support vinai*/
- if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
- goto bad;
- #else
- if (m->m_data + m->m_len + sizeof(struct in_addr) >=
- (m->m_extBuf + m->m_extSize))
- goto bad;
- #endif
- cnt = m->m_len;
- m->m_len += sizeof(struct in_addr);
- cp = mtod(m, u_char *) + sizeof(struct in_addr);
- ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
- bzero(mtod(m, caddr_t), sizeof(struct in_addr));
- for (; cnt > 0; cnt -= optlen, cp += optlen) {
- opt = cp[IPOPT_OPTVAL];
- if (opt == IPOPT_EOL)
- break;
- if (opt == IPOPT_NOP)
- optlen = 1;
- else {
- optlen = cp[IPOPT_OLEN];
- if (optlen <= IPOPT_OLEN || optlen > cnt)
- goto bad;
- }
- switch (opt) {
- default:
- break;
- case IPOPT_LSRR:
- case IPOPT_SSRR:
- /*
- * user process specifies route as:
- * ->A->B->C->D
- * D must be our final destination (but we can't
- * check that since we may not have connected yet).
- * A is first hop destination, which doesn't appear in
- * actual IP option, but is stored before the options.
- */
- if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
- goto bad;
- m->m_len -= sizeof(struct in_addr);
- cnt -= sizeof(struct in_addr);
- optlen -= sizeof(struct in_addr);
- cp[IPOPT_OLEN] = optlen;
- /*
- * Move first hop before start of options.
- */
- bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
- sizeof(struct in_addr));
- /*
- * Then copy rest of options back
- * to close up the deleted entry.
- */
- ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
- sizeof(struct in_addr)),
- (caddr_t)&cp[IPOPT_OFFSET+1],
- (unsigned)cnt + sizeof(struct in_addr));
- break;
- }
- }
- if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
- goto bad;
- *pcbopt = m;
- return (0);
- bad:
- (void)m_free(m);
- return (EINVAL);
- }
- /*
- * Set the IP multicast options in response to user setsockopt().
- */
- static int ip_setmoptions
- (
- int optname,
- struct inpcb * pInPcb,
- struct mbuf * m
- )
- {
- register int error = 0;
- u_char loop;
- struct in_addr addr;
- register struct ip_mreq *mreq;
- register struct ifnet *ifp;
- register struct ip_moptions ** imop = &pInPcb->inp_moptions;
- register struct ip_moptions *imo = *imop;
- struct route ro;
- register struct sockaddr_in *dst;
- struct in_multi * pInMulti;
- M_BLK_ID pInmMblk = NULL;
- M_BLK ** ppMblk;
- if (imo == NULL) {
- /*
- * No multicast option buffer attached to the pcb;
- * allocate one and initialize to default values.
- */
- MALLOC(imo,struct ip_moptions *, sizeof (*imo),
- MT_IPMOPTS, M_WAIT);
- if (imo == NULL)
- return (ENOBUFS);
- *imop = imo;
- imo->imo_multicast_ifp = NULL;
- imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
- imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
- imo->imo_num_memberships = 0;
- imo->pInmMblk = NULL;
- }
- switch (optname) {
- case IP_MULTICAST_IF:
- /*
- * Select the interface for outgoing multicast packets.
- */
- if (m == NULL || m->m_len != sizeof(struct in_addr)) {
- error = EINVAL;
- break;
- }
- addr = *(mtod(m, struct in_addr *));
- /*
- * INADDR_ANY is used to remove a previous selection.
- * When no interface is selected, a default one is
- * chosen every time a multicast packet is sent.
- */
- if (addr.s_addr == INADDR_ANY) {
- imo->imo_multicast_ifp = NULL;
- break;
- }
- /*
- * The selected interface is identified by its local
- * IP address. Find the interface and confirm that
- * it supports multicasting.
- */
- INADDR_TO_IFP(addr, ifp);
- if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
- error = EADDRNOTAVAIL;
- break;
- }
- imo->imo_multicast_ifp = ifp;
- break;
- case IP_MULTICAST_TTL:
- /*
- * Set the IP time-to-live for outgoing multicast packets.
- */
- if (m == NULL || m->m_len != 1) {
- error = EINVAL;
- break;
- }
- imo->imo_multicast_ttl = *(mtod(m, u_char *));
- break;
- case IP_MULTICAST_LOOP:
- /*
- * Set the loopback flag for outgoing multicast packets.
- * Must be zero or one.
- */
- if (m == NULL || m->m_len != 1 ||
- (loop = *(mtod(m, u_char *))) > 1) {
- error = EINVAL;
- break;
- }
- imo->imo_multicast_loop = loop;
- break;
- case IP_ADD_MEMBERSHIP:
- /*
- * Add a multicast group membership.
- * Group must be a valid IP multicast address.
- */
- if (m == NULL || m->m_len != sizeof(struct ip_mreq)) {
- error = EINVAL;
- break;
- }
- mreq = mtod(m, struct ip_mreq *);
- if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
- error = EINVAL;
- break;
- }
- /*
- * If no interface address was provided, use the interface of
- * the route to the given multicast address.
- */
- if (mreq->imr_interface.s_addr == INADDR_ANY) {
- ro.ro_rt = NULL;
- dst = (struct sockaddr_in *)&ro.ro_dst;
- dst->sin_len = sizeof(*dst);
- dst->sin_family = AF_INET;
- dst->sin_addr = mreq->imr_multiaddr;
- rtalloc(&ro);
- if (ro.ro_rt == NULL) {
- error = EADDRNOTAVAIL;
- break;
- }
- ifp = ro.ro_rt->rt_ifp;
- rtfree(ro.ro_rt);
- }
- else {
- INADDR_TO_IFP(mreq->imr_interface, ifp);
- }
- /*
- * See if we found an interface, and confirm that it
- * supports multicast.
- */
- if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
- error = EADDRNOTAVAIL;
- break;
- }
- ppMblk = &imo->pInmMblk;
- while (*ppMblk)
- {
- pInMulti = mtod (*ppMblk, struct in_multi*);
- if ((pInMulti->inm_ifp == ifp) &&
- (pInMulti->inm_addr.s_addr ==
- mreq->imr_multiaddr.s_addr))
- break; /* jump out of the while loop */
- ppMblk = &(*ppMblk)->mBlkHdr.mNext;
- }
- if (*ppMblk == NULL)
- {
- if ((pInmMblk = in_addmulti (&mreq->imr_multiaddr,
- ifp, pInPcb)) == NULL)
- {
- error = ENOBUFS;
- break;
- }
- *ppMblk = pInmMblk; /* add to the list */
- ++imo->imo_num_memberships;
- }
- else
- error = EADDRINUSE;
- break;
- case IP_DROP_MEMBERSHIP:
- /*
- * Drop a multicast group membership.
- * Group must be a valid IP multicast address.
- */
- if (m == NULL || m->m_len != sizeof(struct ip_mreq)) {
- error = EINVAL;
- break;
- }
- mreq = mtod(m, struct ip_mreq *);
- if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
- error = EINVAL;
- break;
- }
- /*
- * If an interface address was specified, get a pointer
- * to its ifnet structure.
- */
- if (mreq->imr_interface.s_addr == INADDR_ANY)
- ifp = NULL;
- else {
- INADDR_TO_IFP(mreq->imr_interface, ifp);
- if (ifp == NULL) {
- error = EADDRNOTAVAIL;
- break;
- }
- }
- {
- ppMblk = &imo->pInmMblk;
- while (*ppMblk)
- {
- pInMulti = mtod (*ppMblk, struct in_multi*);
- if ((ifp == NULL || pInMulti->inm_ifp == ifp) &&
- (pInMulti->inm_addr.s_addr ==
- mreq->imr_multiaddr.s_addr))
- {
- pInmMblk = *ppMblk;
- /* delete from the list */
- *ppMblk = (*ppMblk)->mBlkHdr.mNext;
- break; /* jump out of the while loop */
- }
- ppMblk = &(*ppMblk)->mBlkHdr.mNext;
- }
- if (pInmMblk == NULL)
- {
- error = EADDRNOTAVAIL;
- break;
- }
-
- /*
- * Give up the multicast address record to which the
- * membership points.
- */
- in_delmulti (pInmMblk, pInPcb);
- --imo->imo_num_memberships;
-
- break;
- }
- default:
- error = EOPNOTSUPP;
- break;
- }
- /*
- * If all options have default values, no need to keep the mbuf.
- */
- if (imo->imo_multicast_ifp == NULL &&
- imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
- imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
- imo->imo_num_memberships == 0) {
- FREE(*imop, MT_IPMOPTS);
- *imop = NULL;
- }
- return (error);
- }
- /*
- * Return the IP multicast options in response to user getsockopt().
- */
- int
- ip_getmoptions(optname, imo, mp)
- int optname;
- register struct ip_moptions *imo;
- register struct mbuf **mp;
- {
- u_char *ttl;
- u_char *loop;
- struct in_addr *addr;
- struct in_ifaddr *ia;
- *mp = mBufClGet(M_WAIT, MT_SOOPTS, CL_SIZE_128, TRUE);
- if (*mp == NULL)
- return (ENOBUFS);
-
- switch (optname) {
- case IP_MULTICAST_IF:
- addr = mtod(*mp, struct in_addr *);
- (*mp)->m_len = sizeof(struct in_addr);
- if (imo == NULL || imo->imo_multicast_ifp == NULL)
- addr->s_addr = INADDR_ANY;
- else {
- IFP_TO_IA(imo->imo_multicast_ifp, ia);
- addr->s_addr = (ia == NULL) ? INADDR_ANY
- : IA_SIN(ia)->sin_addr.s_addr;
- }
- return (0);
- case IP_MULTICAST_TTL:
- ttl = mtod(*mp, u_char *);
- (*mp)->m_len = 1;
- *ttl = (imo == NULL) ? IP_DEFAULT_MULTICAST_TTL
- : imo->imo_multicast_ttl;
- return (0);
- case IP_MULTICAST_LOOP:
- loop = mtod(*mp, u_char *);
- (*mp)->m_len = 1;
- *loop = (imo == NULL) ? IP_DEFAULT_MULTICAST_LOOP
- : imo->imo_multicast_loop;
- return (0);
- default:
- return (EOPNOTSUPP);
- }
- }
- /*
- * Discard the IP multicast options.
- */
- void
- ip_freemoptions(imo, pInPcb)
- register struct ip_moptions *imo;
- struct inpcb * pInPcb;
-
- {
- M_BLK_ID pInmMblk;
- M_BLK_ID pInmMblkNext;
- if (imo != NULL) {
- pInmMblk = imo->pInmMblk;
- pInmMblkNext = imo->pInmMblk;
- while ((pInmMblk = pInmMblkNext) != NULL)
- {
- pInmMblkNext = pInmMblk->mBlkHdr.mNext;
- in_delmulti (pInmMblk, pInPcb);
- }
- FREE(imo, MT_IPMOPTS);
- }
- }
- /*
- * Routine called from ip_output() to loop back a copy of an IP multicast
- * packet to the input queue of a specified interface. Note that this
- * calls the output routine of the loopback "driver", but with an interface
- * pointer that might NOT be &loif -- easier than replicating that code here.
- */
- void
- ip_mloopback(ifp, m, dst, rt)
- struct ifnet *ifp;
- register struct mbuf *m;
- register struct sockaddr_in *dst;
- struct rtentry *rt;
- {
- register struct ip *ip;
- struct mbuf *copym;
- struct mbuf * pMbuf;
- #ifdef WV_INSTRUMENTATION
- #ifdef INCLUDE_WVNET /* WV_NET_INFO event */
- WV_NET_EVENT_0 (NET_AUX_EVENT, WV_NET_INFO, 12, 7,
- WV_NETEVENT_IPMLOOP_START, WV_NET_RECV)
- #endif /* INCLUDE_WVNET */
- #endif
- copym = m_copy(m, 0, M_COPYALL);
- if (copym != NULL) {
- /*
- * We don't bother to fragment if the IP length is greater
- * than the interface's MTU. Can this possibly matter?
- */
- ip = mtod(copym, struct ip *);
- /*
- * This copying of ip header is done because the same
- * ip header is shared by looutput and the code under the
- * the label sendit: in ip_output. so a fresh mbuf has to be
- * linked to the data.
- */
- if ((pMbuf = mBufClGet (M_DONTWAIT, MT_DATA, sizeof(struct ip),
- TRUE)) == NULL)
- {
- m_freem (copym);
- return;
- }
- /* copy the ip header */
- bcopy ((char *)ip , (char *)(mtod(pMbuf, char *)),
- sizeof(struct ip));
- pMbuf->m_len = sizeof (struct ip);
- pMbuf->m_flags = copym->m_flags; /* copy the flags */
- pMbuf->m_pkthdr = copym->m_pkthdr; /* copy the pkt hdr */
- pMbuf->m_next = copym;
-
- copym->m_flags &= ~M_PKTHDR;
- copym->m_len -= sizeof(struct ip);
- copym->m_data += sizeof(struct ip);
- ip = mtod(pMbuf, struct ip *);
- copym = pMbuf;
- ip->ip_len = htons((u_short)ip->ip_len);
- ip->ip_off = htons((u_short)ip->ip_off);
- ip->ip_sum = 0;
- if (_ipCfgFlags & IP_DO_CHECKSUM_SND)
- ip->ip_sum = in_cksum(copym, ip->ip_hl << 2);
- (void) looutput(ifp, copym, (struct sockaddr *)dst, rt);
- }
- }