diff options
Diffstat (limited to '')
| -rw-r--r-- | c/src/lib/libnetworking/netinet/ip_output.c | 1307 |
1 files changed, 0 insertions, 1307 deletions
diff --git a/c/src/lib/libnetworking/netinet/ip_output.c b/c/src/lib/libnetworking/netinet/ip_output.c deleted file mode 100644 index 810f6c7479..0000000000 --- a/c/src/lib/libnetworking/netinet/ip_output.c +++ /dev/null @@ -1,1307 +0,0 @@ -/* - * 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 - * $Id$ - */ - -#define _IP_VHL - -#include <sys/param.h> -#include <sys/queue.h> -#include <sys/systm.h> -#include <sys/malloc.h> -#include <sys/mbuf.h> -#include <sys/errno.h> -#include <sys/protosw.h> -#include <sys/socket.h> -#include <sys/socketvar.h> - -#include <net/if.h> -#include <net/route.h> - -#include <netinet/in.h> -#include <netinet/in_systm.h> -#include <netinet/ip.h> -#include <netinet/in_pcb.h> -#include <netinet/in_var.h> -#include <netinet/ip_var.h> - -#ifdef vax -#include <machine/mtpr.h> -#endif -#include <machine/in_cksum.h> - -#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 -#undef COMPAT_IPFW -#define COMPAT_IPFW 1 -#else -#undef COMPAT_IPFW -#endif - -u_short ip_id; - -static struct mbuf *ip_insertoptions __P((struct mbuf *, struct mbuf *, int *)); -static void ip_mloopback - __P((struct ifnet *, struct mbuf *, struct sockaddr_in *, int)); -static int ip_getmoptions - __P((int, struct ip_moptions *, struct mbuf **)); -static int ip_optcopy __P((struct ip *, struct ip *)); -static int ip_pcbopts __P((struct mbuf **, struct mbuf *)); -static int ip_setmoptions - __P((int, struct ip_moptions **, struct mbuf *)); - -extern struct protosw inetsw[]; - -/* - * 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; -{ - struct ip *ip, *mhip; - struct ifnet *ifp; - struct mbuf *m = m0; - int hlen = sizeof (struct ip); - int len, off, error = 0; - struct sockaddr_in *dst; - struct in_ifaddr *ia; - int isbroadcast; - -#ifdef DIAGNOSTIC - if ((m->m_flags & M_PKTHDR) == 0) - panic("ip_output no HDR"); - if (!ro) - panic("ip_output no route, proto = %d", - mtod(m, struct ip *)->ip_p); -#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_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2); - ip->ip_off &= IP_DF; - ip->ip_id = htons(ip_id++); - ipstat.ips_localout++; - } else { - hlen = IP_VHL_HL(ip->ip_vhl) << 2; - } - - 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)) { - 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; - } - /* - * 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) { - ipstat.ips_noroute++; - error = ENETUNREACH; - goto bad; - } - ifp = ia->ia_ifp; - ip->ip_ttl = 1; - isbroadcast = in_broadcast(dst->sin_addr, ifp); - } else { - /* - * If this is the case, we probably don't want to allocate - * a protocol-cloned route since we didn't get one from the - * ULP. This lets TCP do its thing, while not burdening - * forwarding or ICMP with the overhead of cloning a route. - * Of course, we still want to do any cloning requested by - * the link layer, as this is probably required in all cases - * for correct operation (as it is for ARP). - */ - if (ro->ro_rt == 0) - rtalloc_ign(ro, RTF_PRCLONING); - if (ro->ro_rt == 0) { - ipstat.ips_noroute++; - 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 (ro->ro_rt->rt_flags & RTF_HOST) - isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); - else - isbroadcast = in_broadcast(dst->sin_addr, ifp); - } - if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { - struct in_multi *inm; - - 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; - /* - * 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; - if (imo->imo_multicast_vif != -1) - ip->ip_src.s_addr = - ip_mcast_src(imo->imo_multicast_vif); - } else - ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; - /* - * Confirm that the outgoing interface supports multicast. - */ - if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { - if ((ifp->if_flags & IFF_MULTICAST) == 0) { - ipstat.ips_noroute++; - 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; - - for (ia = in_ifaddr; ia; ia = ia->ia_next) - if (ia->ia_ifp == ifp) { - ip->ip_src = IA_SIN(ia)->sin_addr; - break; - } - } - - 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, hlen); - } - 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 (ip_mrouter && (flags & IP_FORWARDING) == 0) { - /* - * Check if rsvp daemon is running. If not, don't - * set ip_moptions. This ensures that the packet - * is multicast and not just sent down one link - * as prescribed by rsvpd. - */ - if (!rsvp_on) - imo = NULL; - if (ip_mforward(ip, ifp, m, imo) != 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->if_flags & IFF_LOOPBACK) { - m_freem(m); - goto done; - } - - 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; -#endif - /* - * Verify that we have any chance at all of being able to queue - * the packet or packet fragments - */ - if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >= - ifp->if_snd.ifq_maxlen) { - error = ENOBUFS; - goto bad; - } - - /* - * Look for broadcast address and - * and verify user is allowed to send - * such a packet. - */ - if (isbroadcast) { - if ((ifp->if_flags & IFF_BROADCAST) == 0) { - error = EADDRNOTAVAIL; - goto bad; - } - if ((flags & IP_ALLOWBROADCAST) == 0) { - error = EACCES; - goto bad; - } - /* don't allow broadcast messages to be fragmented */ - if ((u_short)ip->ip_len > ifp->if_mtu) { - error = EMSGSIZE; - goto bad; - } - m->m_flags |= M_BCAST; - } else { - m->m_flags &= ~M_BCAST; - } - -sendit: - /* - * IpHack's section. - * - Xlate: translate packet's addr/port (NAT). - * - Firewall: deny/allow/etc. - * - Wrap: fake packet's addr/port <unimpl.> - * - Encapsulate: put it in another IP and send out. <unimp.> - */ - -#ifdef COMPAT_IPFW - if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, ifp, IP_NAT_OUT)) { - error = EACCES; - goto done; - } - - /* - * Check with the firewall... - */ - if (ip_fw_chk_ptr) { -#ifdef IPDIVERT - ip_divert_port = (*ip_fw_chk_ptr)(&ip, - hlen, ifp, ip_divert_ignore, &m); - ip_divert_ignore = 0; - if (ip_divert_port) { /* Divert packet */ - (*inetsw[ip_protox[IPPROTO_DIVERT]].pr_input)(m, 0); - goto done; - } -#else - /* If ipfw says divert, we have to just drop packet */ - if ((*ip_fw_chk_ptr)(&ip, hlen, ifp, 0, &m)) { - m_freem(m); - goto done; - } -#endif - if (!m) { - error = EACCES; - goto done; - } - } -#endif /* COMPAT_IPFW */ - - /* - * If small enough for interface, can just send directly. - */ - if ((u_short)ip->ip_len <= ifp->if_mtu) { - ip->ip_len = htons((u_short)ip->ip_len); - ip->ip_off = htons((u_short)ip->ip_off); - ip->ip_sum = 0; - if (ip->ip_vhl == IP_VHL_BORING) { - ip->ip_sum = in_cksum_hdr(ip); - } else { - 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) { - error = EMSGSIZE; - /* - * This case can happen if the user changed the MTU - * of an interface after enabling IP on it. Because - * most netifs don't keep track of routes pointing to - * them, there is no way for one to update all its - * routes when the MTU is changed. - */ - if ((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 > ifp->if_mtu)) { - ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; - } - ipstat.ips_cantfrag++; - goto bad; - } - len = (ifp->if_mtu - hlen) &~ 7; - if (len < 8) { - error = EMSGSIZE; - goto bad; - } - - { - int mhlen, firstlen = len; - struct mbuf **mnext = &m->m_nextpkt; - - /* - * 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) { - MGETHDR(m, M_DONTWAIT, MT_HEADER); - if (m == 0) { - error = ENOBUFS; - ipstat.ips_odropped++; - goto sendorfree; - } - 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_vhl = IP_MAKE_VHL(IPVERSION, 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; /* ??? */ - ipstat.ips_odropped++; - 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 (mhip->ip_vhl == IP_VHL_BORING) { - mhip->ip_sum = in_cksum_hdr(mhip); - } else { - mhip->ip_sum = in_cksum(m, mhlen); - } - *mnext = m; - mnext = &m->m_nextpkt; - ipstat.ips_ofragments++; - } - /* - * 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 (ip->ip_vhl == IP_VHL_BORING) { - ip->ip_sum = in_cksum_hdr(ip); - } else { - 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) - ipstat.ips_fragmented++; - } -done: - return (error); -bad: - m_freem(m0); - 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. - * - * XXX This routine assumes that the packet has no options in place. - */ -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 (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { - MGETHDR(n, M_DONTWAIT, MT_HEADER); - 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; - (void)memcpy(mtod(m, void *), ip, sizeof(struct ip)); - } 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)); - } - ip = mtod(m, struct ip *); - bcopy(p->ipopt_list, ip + 1, optlen); - *phlen = sizeof(struct ip) + optlen; - ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2); - ip->ip_len += optlen; - return (m); -} - -/* - * Copy options from ip to jp, - * omitting those not copied during fragmentation. - */ -static 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_VHL_HL(ip->ip_vhl) << 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(cp, dp, 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; - - 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: - case IP_RECVIF: - if (m == 0 || m->m_len != sizeof(int)) - error = EINVAL; - else { - optval = *mtod(m, int *); - switch (optname) { - - case IP_TOS: - inp->inp_ip_tos = optval; - break; - - case IP_TTL: - inp->inp_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; - - case IP_RECVIF: - OPTSET(INP_RECVIF); - break; - } - } - break; -#undef OPTSET - - case IP_MULTICAST_IF: - case IP_MULTICAST_VIF: - case IP_MULTICAST_TTL: - case IP_MULTICAST_LOOP: - case IP_ADD_MEMBERSHIP: - case IP_DROP_MEMBERSHIP: - error = ip_setmoptions(optname, &inp->inp_moptions, m); - break; - - case IP_PORTRANGE: - if (m == 0 || m->m_len != sizeof(int)) - error = EINVAL; - else { - optval = *mtod(m, int *); - - switch (optval) { - - case IP_PORTRANGE_DEFAULT: - inp->inp_flags &= ~(INP_LOWPORT); - inp->inp_flags &= ~(INP_HIGHPORT); - break; - - case IP_PORTRANGE_HIGH: - inp->inp_flags &= ~(INP_LOWPORT); - inp->inp_flags |= INP_HIGHPORT; - break; - - case IP_PORTRANGE_LOW: - inp->inp_flags &= ~(INP_HIGHPORT); - inp->inp_flags |= INP_LOWPORT; - break; - - default: - error = EINVAL; - break; - } - } - break; - - default: - error = ENOPROTOOPT; - break; - } - if (m) - (void)m_free(m); - break; - - case PRCO_GETOPT: - switch (optname) { - case IP_OPTIONS: - case IP_RETOPTS: - *mp = m = m_get(M_WAIT, MT_SOOPTS); - if (inp->inp_options) { - m->m_len = inp->inp_options->m_len; - bcopy(mtod(inp->inp_options, void *), - mtod(m, void *), m->m_len); - } else - m->m_len = 0; - break; - - case IP_TOS: - case IP_TTL: - case IP_RECVOPTS: - case IP_RECVRETOPTS: - case IP_RECVDSTADDR: - case IP_RECVIF: - *mp = m = m_get(M_WAIT, MT_SOOPTS); - m->m_len = sizeof(int); - switch (optname) { - - case IP_TOS: - optval = inp->inp_ip_tos; - break; - - case IP_TTL: - optval = inp->inp_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; - - case IP_RECVIF: - optval = OPTBIT(INP_RECVIF); - break; - } - *mtod(m, int *) = optval; - break; - - case IP_MULTICAST_IF: - case IP_MULTICAST_VIF: - 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; - - case IP_PORTRANGE: - *mp = m = m_get(M_WAIT, MT_SOOPTS); - m->m_len = sizeof(int); - - if (inp->inp_flags & INP_HIGHPORT) - optval = IP_PORTRANGE_HIGH; - else if (inp->inp_flags & INP_LOWPORT) - optval = IP_PORTRANGE_LOW; - else - optval = 0; - - *mtod(m, int *) = optval; - break; - - default: - 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. - */ -static 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 (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) - goto bad; - 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(optname, imop, m) - int optname; - struct ip_moptions **imop; - struct mbuf *m; -{ - register int error = 0; - u_char loop; - register int i; - struct in_addr addr; - register struct ip_mreq *mreq; - register struct ifnet *ifp; - register struct ip_moptions *imo = *imop; - struct route ro; - register struct sockaddr_in *dst; - int s; - - if (imo == NULL) { - /* - * No multicast option buffer attached to the pcb; - * allocate one and initialize to default values. - */ - imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, - M_WAITOK); - - if (imo == NULL) - return (ENOBUFS); - *imop = imo; - imo->imo_multicast_ifp = NULL; - imo->imo_multicast_vif = -1; - imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; - imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP; - imo->imo_num_memberships = 0; - } - - switch (optname) { - /* store an index number for the vif you wanna use in the send */ - case IP_MULTICAST_VIF: - if (!legal_vif_num) { - error = EOPNOTSUPP; - break; - } - if (m == NULL || m->m_len != sizeof(int)) { - error = EINVAL; - break; - } - i = *(mtod(m, int *)); - if (!legal_vif_num(i) && (i != -1)) { - error = EINVAL; - break; - } - imo->imo_multicast_vif = i; - break; - - 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. - */ - s = splimp(); - INADDR_TO_IFP(addr, ifp); - if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { - splx(s); - error = EADDRNOTAVAIL; - break; - } - imo->imo_multicast_ifp = ifp; - splx(s); - 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; - } - s = splimp(); - /* - * 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) { - bzero((caddr_t)&ro, sizeof(ro)); - 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; - splx(s); - 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; - splx(s); - break; - } - /* - * See if the membership already exists or if all the - * membership slots are full. - */ - for (i = 0; i < imo->imo_num_memberships; ++i) { - if (imo->imo_membership[i]->inm_ifp == ifp && - imo->imo_membership[i]->inm_addr.s_addr - == mreq->imr_multiaddr.s_addr) - break; - } - if (i < imo->imo_num_memberships) { - error = EADDRINUSE; - splx(s); - break; - } - if (i == IP_MAX_MEMBERSHIPS) { - error = ETOOMANYREFS; - splx(s); - break; - } - /* - * Everything looks good; add a new record to the multicast - * address list for the given interface. - */ - if ((imo->imo_membership[i] = - in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) { - error = ENOBUFS; - splx(s); - break; - } - ++imo->imo_num_memberships; - splx(s); - 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; - } - - s = splimp(); - /* - * 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; - splx(s); - break; - } - } - /* - * Find the membership in the membership array. - */ - for (i = 0; i < imo->imo_num_memberships; ++i) { - if ((ifp == NULL || - imo->imo_membership[i]->inm_ifp == ifp) && - imo->imo_membership[i]->inm_addr.s_addr == - mreq->imr_multiaddr.s_addr) - break; - } - if (i == imo->imo_num_memberships) { - error = EADDRNOTAVAIL; - splx(s); - break; - } - /* - * Give up the multicast address record to which the - * membership points. - */ - in_delmulti(imo->imo_membership[i]); - /* - * Remove the gap in the membership array. - */ - for (++i; i < imo->imo_num_memberships; ++i) - imo->imo_membership[i-1] = imo->imo_membership[i]; - --imo->imo_num_memberships; - splx(s); - 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_vif == -1 && - imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && - imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && - imo->imo_num_memberships == 0) { - free(*imop, M_IPMOPTS); - *imop = NULL; - } - - return (error); -} - -/* - * Return the IP multicast options in response to user getsockopt(). - */ -static 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 = m_get(M_WAIT, MT_SOOPTS); - - switch (optname) { - - case IP_MULTICAST_VIF: - if (imo != NULL) - *(mtod(*mp, int *)) = imo->imo_multicast_vif; - else - *(mtod(*mp, int *)) = -1; - (*mp)->m_len = sizeof(int); - return(0); - - 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) - register struct ip_moptions *imo; -{ - register int i; - - if (imo != NULL) { - for (i = 0; i < imo->imo_num_memberships; ++i) - in_delmulti(imo->imo_membership[i]); - free(imo, M_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 a loopback interface -- evil, but easier than - * replicating that code here. - */ -static void -ip_mloopback(ifp, m, dst, hlen) - struct ifnet *ifp; - register struct mbuf *m; - register struct sockaddr_in *dst; - int hlen; -{ - register struct ip *ip; - struct mbuf *copym; - - copym = m_copy(m, 0, M_COPYALL); - if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) - copym = m_pullup(copym, hlen); - 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 *); - ip->ip_len = htons((u_short)ip->ip_len); - ip->ip_off = htons((u_short)ip->ip_off); - ip->ip_sum = 0; - if (ip->ip_vhl == IP_VHL_BORING) { - ip->ip_sum = in_cksum_hdr(ip); - } else { - ip->ip_sum = in_cksum(copym, hlen); - } - /* - * NB: - * It's not clear whether there are any lingering - * reentrancy problems in other areas which might - * be exposed by using ip_input directly (in - * particular, everything which modifies the packet - * in-place). Yet another option is using the - * protosw directly to deliver the looped back - * packet. For the moment, we'll err on the side - * of safety by continuing to abuse looutput(). - */ -#ifdef notdef - copym->m_pkthdr.rcvif = ifp; - ip_input(copym) -#else - (void) looutput(ifp, copym, (struct sockaddr *)dst, NULL); -#endif - } -} |