The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet/ip_output.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1988, 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ip_output.c 8.3 (Berkeley) 1/21/94
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/12.0/sys/netinet/ip_output.c 339219 2018-10-07 11:26:15Z tuexen $");
   36 
   37 #include "opt_inet.h"
   38 #include "opt_ratelimit.h"
   39 #include "opt_ipsec.h"
   40 #include "opt_mbuf_stress_test.h"
   41 #include "opt_mpath.h"
   42 #include "opt_route.h"
   43 #include "opt_sctp.h"
   44 #include "opt_rss.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/kernel.h>
   49 #include <sys/lock.h>
   50 #include <sys/malloc.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/priv.h>
   53 #include <sys/proc.h>
   54 #include <sys/protosw.h>
   55 #include <sys/rmlock.h>
   56 #include <sys/sdt.h>
   57 #include <sys/socket.h>
   58 #include <sys/socketvar.h>
   59 #include <sys/sysctl.h>
   60 #include <sys/ucred.h>
   61 
   62 #include <net/if.h>
   63 #include <net/if_var.h>
   64 #include <net/if_llatbl.h>
   65 #include <net/netisr.h>
   66 #include <net/pfil.h>
   67 #include <net/route.h>
   68 #ifdef RADIX_MPATH
   69 #include <net/radix_mpath.h>
   70 #endif
   71 #include <net/rss_config.h>
   72 #include <net/vnet.h>
   73 
   74 #include <netinet/in.h>
   75 #include <netinet/in_kdtrace.h>
   76 #include <netinet/in_systm.h>
   77 #include <netinet/ip.h>
   78 #include <netinet/in_pcb.h>
   79 #include <netinet/in_rss.h>
   80 #include <netinet/in_var.h>
   81 #include <netinet/ip_var.h>
   82 #include <netinet/ip_options.h>
   83 
   84 #include <netinet/udp.h>
   85 #include <netinet/udp_var.h>
   86 
   87 #ifdef SCTP
   88 #include <netinet/sctp.h>
   89 #include <netinet/sctp_crc32.h>
   90 #endif
   91 
   92 #include <netipsec/ipsec_support.h>
   93 
   94 #include <machine/in_cksum.h>
   95 
   96 #include <security/mac/mac_framework.h>
   97 
   98 #ifdef MBUF_STRESS_TEST
   99 static int mbuf_frag_size = 0;
  100 SYSCTL_INT(_net_inet_ip, OID_AUTO, mbuf_frag_size, CTLFLAG_RW,
  101         &mbuf_frag_size, 0, "Fragment outgoing mbufs to this size");
  102 #endif
  103 
  104 static void     ip_mloopback(struct ifnet *, const struct mbuf *, int);
  105 
  106 
  107 extern int in_mcast_loop;
  108 extern  struct protosw inetsw[];
  109 
  110 static inline int
  111 ip_output_pfil(struct mbuf **mp, struct ifnet *ifp, struct inpcb *inp,
  112     struct sockaddr_in *dst, int *fibnum, int *error)
  113 {
  114         struct m_tag *fwd_tag = NULL;
  115         struct mbuf *m;
  116         struct in_addr odst;
  117         struct ip *ip;
  118 
  119         m = *mp;
  120         ip = mtod(m, struct ip *);
  121 
  122         /* Run through list of hooks for output packets. */
  123         odst.s_addr = ip->ip_dst.s_addr;
  124         *error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, PFIL_OUT, 0, inp);
  125         m = *mp;
  126         if ((*error) != 0 || m == NULL)
  127                 return 1; /* Finished */
  128 
  129         ip = mtod(m, struct ip *);
  130 
  131         /* See if destination IP address was changed by packet filter. */
  132         if (odst.s_addr != ip->ip_dst.s_addr) {
  133                 m->m_flags |= M_SKIP_FIREWALL;
  134                 /* If destination is now ourself drop to ip_input(). */
  135                 if (in_localip(ip->ip_dst)) {
  136                         m->m_flags |= M_FASTFWD_OURS;
  137                         if (m->m_pkthdr.rcvif == NULL)
  138                                 m->m_pkthdr.rcvif = V_loif;
  139                         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
  140                                 m->m_pkthdr.csum_flags |=
  141                                         CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
  142                                 m->m_pkthdr.csum_data = 0xffff;
  143                         }
  144                         m->m_pkthdr.csum_flags |=
  145                                 CSUM_IP_CHECKED | CSUM_IP_VALID;
  146 #ifdef SCTP
  147                         if (m->m_pkthdr.csum_flags & CSUM_SCTP)
  148                                 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
  149 #endif
  150                         *error = netisr_queue(NETISR_IP, m);
  151                         return 1; /* Finished */
  152                 }
  153 
  154                 bzero(dst, sizeof(*dst));
  155                 dst->sin_family = AF_INET;
  156                 dst->sin_len = sizeof(*dst);
  157                 dst->sin_addr = ip->ip_dst;
  158 
  159                 return -1; /* Reloop */
  160         }
  161         /* See if fib was changed by packet filter. */
  162         if ((*fibnum) != M_GETFIB(m)) {
  163                 m->m_flags |= M_SKIP_FIREWALL;
  164                 *fibnum = M_GETFIB(m);
  165                 return -1; /* Reloop for FIB change */
  166         }
  167 
  168         /* See if local, if yes, send it to netisr with IP_FASTFWD_OURS. */
  169         if (m->m_flags & M_FASTFWD_OURS) {
  170                 if (m->m_pkthdr.rcvif == NULL)
  171                         m->m_pkthdr.rcvif = V_loif;
  172                 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
  173                         m->m_pkthdr.csum_flags |=
  174                                 CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
  175                         m->m_pkthdr.csum_data = 0xffff;
  176                 }
  177 #ifdef SCTP
  178                 if (m->m_pkthdr.csum_flags & CSUM_SCTP)
  179                         m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
  180 #endif
  181                 m->m_pkthdr.csum_flags |=
  182                         CSUM_IP_CHECKED | CSUM_IP_VALID;
  183 
  184                 *error = netisr_queue(NETISR_IP, m);
  185                 return 1; /* Finished */
  186         }
  187         /* Or forward to some other address? */
  188         if ((m->m_flags & M_IP_NEXTHOP) &&
  189             ((fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL)) {
  190                 bcopy((fwd_tag+1), dst, sizeof(struct sockaddr_in));
  191                 m->m_flags |= M_SKIP_FIREWALL;
  192                 m->m_flags &= ~M_IP_NEXTHOP;
  193                 m_tag_delete(m, fwd_tag);
  194 
  195                 return -1; /* Reloop for CHANGE of dst */
  196         }
  197 
  198         return 0;
  199 }
  200 
  201 /*
  202  * IP output.  The packet in mbuf chain m contains a skeletal IP
  203  * header (with len, off, ttl, proto, tos, src, dst).
  204  * The mbuf chain containing the packet will be freed.
  205  * The mbuf opt, if present, will not be freed.
  206  * If route ro is present and has ro_rt initialized, route lookup would be
  207  * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL,
  208  * then result of route lookup is stored in ro->ro_rt.
  209  *
  210  * In the IP forwarding case, the packet will arrive with options already
  211  * inserted, so must have a NULL opt pointer.
  212  */
  213 int
  214 ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
  215     struct ip_moptions *imo, struct inpcb *inp)
  216 {
  217         struct rm_priotracker in_ifa_tracker;
  218         struct ip *ip;
  219         struct ifnet *ifp = NULL;       /* keep compiler happy */
  220         struct mbuf *m0;
  221         int hlen = sizeof (struct ip);
  222         int mtu;
  223         int error = 0;
  224         struct sockaddr_in *dst;
  225         const struct sockaddr_in *gw;
  226         struct in_ifaddr *ia;
  227         int isbroadcast;
  228         uint16_t ip_len, ip_off;
  229         struct route iproute;
  230         struct rtentry *rte;    /* cache for ro->ro_rt */
  231         uint32_t fibnum;
  232 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  233         int no_route_but_check_spd = 0;
  234 #endif
  235         M_ASSERTPKTHDR(m);
  236 
  237         if (inp != NULL) {
  238                 INP_LOCK_ASSERT(inp);
  239                 M_SETFIB(m, inp->inp_inc.inc_fibnum);
  240                 if ((flags & IP_NODEFAULTFLOWID) == 0) {
  241                         m->m_pkthdr.flowid = inp->inp_flowid;
  242                         M_HASHTYPE_SET(m, inp->inp_flowtype);
  243                 }
  244         }
  245 
  246         if (ro == NULL) {
  247                 ro = &iproute;
  248                 bzero(ro, sizeof (*ro));
  249         }
  250 
  251         if (opt) {
  252                 int len = 0;
  253                 m = ip_insertoptions(m, opt, &len);
  254                 if (len != 0)
  255                         hlen = len; /* ip->ip_hl is updated above */
  256         }
  257         ip = mtod(m, struct ip *);
  258         ip_len = ntohs(ip->ip_len);
  259         ip_off = ntohs(ip->ip_off);
  260 
  261         if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
  262                 ip->ip_v = IPVERSION;
  263                 ip->ip_hl = hlen >> 2;
  264                 ip_fillid(ip);
  265         } else {
  266                 /* Header already set, fetch hlen from there */
  267                 hlen = ip->ip_hl << 2;
  268         }
  269         if ((flags & IP_FORWARDING) == 0)
  270                 IPSTAT_INC(ips_localout);
  271 
  272         /*
  273          * dst/gw handling:
  274          *
  275          * dst can be rewritten but always points to &ro->ro_dst.
  276          * gw is readonly but can point either to dst OR rt_gateway,
  277          * therefore we need restore gw if we're redoing lookup.
  278          */
  279         gw = dst = (struct sockaddr_in *)&ro->ro_dst;
  280         fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m);
  281         rte = ro->ro_rt;
  282         if (rte == NULL) {
  283                 bzero(dst, sizeof(*dst));
  284                 dst->sin_family = AF_INET;
  285                 dst->sin_len = sizeof(*dst);
  286                 dst->sin_addr = ip->ip_dst;
  287         }
  288         NET_EPOCH_ENTER();
  289 again:
  290         /*
  291          * Validate route against routing table additions;
  292          * a better/more specific route might have been added.
  293          */
  294         if (inp)
  295                 RT_VALIDATE(ro, &inp->inp_rt_cookie, fibnum);
  296         /*
  297          * If there is a cached route,
  298          * check that it is to the same destination
  299          * and is still up.  If not, free it and try again.
  300          * The address family should also be checked in case of sharing the
  301          * cache with IPv6.
  302          * Also check whether routing cache needs invalidation.
  303          */
  304         rte = ro->ro_rt;
  305         if (rte && ((rte->rt_flags & RTF_UP) == 0 ||
  306                     rte->rt_ifp == NULL ||
  307                     !RT_LINK_IS_UP(rte->rt_ifp) ||
  308                           dst->sin_family != AF_INET ||
  309                           dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
  310                 RO_INVALIDATE_CACHE(ro);
  311                 rte = NULL;
  312         }
  313         ia = NULL;
  314         /*
  315          * If routing to interface only, short circuit routing lookup.
  316          * The use of an all-ones broadcast address implies this; an
  317          * interface is specified by the broadcast address of an interface,
  318          * or the destination address of a ptp interface.
  319          */
  320         if (flags & IP_SENDONES) {
  321                 if ((ia = ifatoia(ifa_ifwithbroadaddr(sintosa(dst),
  322                                                       M_GETFIB(m)))) == NULL &&
  323                     (ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
  324                                                     M_GETFIB(m)))) == NULL) {
  325                         IPSTAT_INC(ips_noroute);
  326                         error = ENETUNREACH;
  327                         goto bad;
  328                 }
  329                 ip->ip_dst.s_addr = INADDR_BROADCAST;
  330                 dst->sin_addr = ip->ip_dst;
  331                 ifp = ia->ia_ifp;
  332                 ip->ip_ttl = 1;
  333                 isbroadcast = 1;
  334         } else if (flags & IP_ROUTETOIF) {
  335                 if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
  336                                                     M_GETFIB(m)))) == NULL &&
  337                     (ia = ifatoia(ifa_ifwithnet(sintosa(dst), 0,
  338                                                 M_GETFIB(m)))) == NULL) {
  339                         IPSTAT_INC(ips_noroute);
  340                         error = ENETUNREACH;
  341                         goto bad;
  342                 }
  343                 ifp = ia->ia_ifp;
  344                 ip->ip_ttl = 1;
  345                 isbroadcast = ifp->if_flags & IFF_BROADCAST ?
  346                     in_ifaddr_broadcast(dst->sin_addr, ia) : 0;
  347         } else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
  348             imo != NULL && imo->imo_multicast_ifp != NULL) {
  349                 /*
  350                  * Bypass the normal routing lookup for multicast
  351                  * packets if the interface is specified.
  352                  */
  353                 ifp = imo->imo_multicast_ifp;
  354                 IFP_TO_IA(ifp, ia, &in_ifa_tracker);
  355                 isbroadcast = 0;        /* fool gcc */
  356         } else {
  357                 /*
  358                  * We want to do any cloning requested by the link layer,
  359                  * as this is probably required in all cases for correct
  360                  * operation (as it is for ARP).
  361                  */
  362                 if (rte == NULL) {
  363 #ifdef RADIX_MPATH
  364                         rtalloc_mpath_fib(ro,
  365                             ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
  366                             fibnum);
  367 #else
  368                         in_rtalloc_ign(ro, 0, fibnum);
  369 #endif
  370                         rte = ro->ro_rt;
  371                 }
  372                 if (rte == NULL ||
  373                     (rte->rt_flags & RTF_UP) == 0 ||
  374                     rte->rt_ifp == NULL ||
  375                     !RT_LINK_IS_UP(rte->rt_ifp)) {
  376 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  377                         /*
  378                          * There is no route for this packet, but it is
  379                          * possible that a matching SPD entry exists.
  380                          */
  381                         no_route_but_check_spd = 1;
  382                         mtu = 0; /* Silence GCC warning. */
  383                         goto sendit;
  384 #endif
  385                         IPSTAT_INC(ips_noroute);
  386                         error = EHOSTUNREACH;
  387                         goto bad;
  388                 }
  389                 ia = ifatoia(rte->rt_ifa);
  390                 ifp = rte->rt_ifp;
  391                 counter_u64_add(rte->rt_pksent, 1);
  392                 rt_update_ro_flags(ro);
  393                 if (rte->rt_flags & RTF_GATEWAY)
  394                         gw = (struct sockaddr_in *)rte->rt_gateway;
  395                 if (rte->rt_flags & RTF_HOST)
  396                         isbroadcast = (rte->rt_flags & RTF_BROADCAST);
  397                 else if (ifp->if_flags & IFF_BROADCAST)
  398                         isbroadcast = in_ifaddr_broadcast(gw->sin_addr, ia);
  399                 else
  400                         isbroadcast = 0;
  401         }
  402 
  403         /*
  404          * Calculate MTU.  If we have a route that is up, use that,
  405          * otherwise use the interface's MTU.
  406          */
  407         if (rte != NULL && (rte->rt_flags & (RTF_UP|RTF_HOST)))
  408                 mtu = rte->rt_mtu;
  409         else
  410                 mtu = ifp->if_mtu;
  411         /* Catch a possible divide by zero later. */
  412         KASSERT(mtu > 0, ("%s: mtu %d <= 0, rte=%p (rt_flags=0x%08x) ifp=%p",
  413             __func__, mtu, rte, (rte != NULL) ? rte->rt_flags : 0, ifp));
  414 
  415         if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
  416                 m->m_flags |= M_MCAST;
  417                 /*
  418                  * IP destination address is multicast.  Make sure "gw"
  419                  * still points to the address in "ro".  (It may have been
  420                  * changed to point to a gateway address, above.)
  421                  */
  422                 gw = dst;
  423                 /*
  424                  * See if the caller provided any multicast options
  425                  */
  426                 if (imo != NULL) {
  427                         ip->ip_ttl = imo->imo_multicast_ttl;
  428                         if (imo->imo_multicast_vif != -1)
  429                                 ip->ip_src.s_addr =
  430                                     ip_mcast_src ?
  431                                     ip_mcast_src(imo->imo_multicast_vif) :
  432                                     INADDR_ANY;
  433                 } else
  434                         ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
  435                 /*
  436                  * Confirm that the outgoing interface supports multicast.
  437                  */
  438                 if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
  439                         if ((ifp->if_flags & IFF_MULTICAST) == 0) {
  440                                 IPSTAT_INC(ips_noroute);
  441                                 error = ENETUNREACH;
  442                                 goto bad;
  443                         }
  444                 }
  445                 /*
  446                  * If source address not specified yet, use address
  447                  * of outgoing interface.
  448                  */
  449                 if (ip->ip_src.s_addr == INADDR_ANY) {
  450                         /* Interface may have no addresses. */
  451                         if (ia != NULL)
  452                                 ip->ip_src = IA_SIN(ia)->sin_addr;
  453                 }
  454 
  455                 if ((imo == NULL && in_mcast_loop) ||
  456                     (imo && imo->imo_multicast_loop)) {
  457                         /*
  458                          * Loop back multicast datagram if not expressly
  459                          * forbidden to do so, even if we are not a member
  460                          * of the group; ip_input() will filter it later,
  461                          * thus deferring a hash lookup and mutex acquisition
  462                          * at the expense of a cheap copy using m_copym().
  463                          */
  464                         ip_mloopback(ifp, m, hlen);
  465                 } else {
  466                         /*
  467                          * If we are acting as a multicast router, perform
  468                          * multicast forwarding as if the packet had just
  469                          * arrived on the interface to which we are about
  470                          * to send.  The multicast forwarding function
  471                          * recursively calls this function, using the
  472                          * IP_FORWARDING flag to prevent infinite recursion.
  473                          *
  474                          * Multicasts that are looped back by ip_mloopback(),
  475                          * above, will be forwarded by the ip_input() routine,
  476                          * if necessary.
  477                          */
  478                         if (V_ip_mrouter && (flags & IP_FORWARDING) == 0) {
  479                                 /*
  480                                  * If rsvp daemon is not running, do not
  481                                  * set ip_moptions. This ensures that the packet
  482                                  * is multicast and not just sent down one link
  483                                  * as prescribed by rsvpd.
  484                                  */
  485                                 if (!V_rsvp_on)
  486                                         imo = NULL;
  487                                 if (ip_mforward &&
  488                                     ip_mforward(ip, ifp, m, imo) != 0) {
  489                                         m_freem(m);
  490                                         goto done;
  491                                 }
  492                         }
  493                 }
  494 
  495                 /*
  496                  * Multicasts with a time-to-live of zero may be looped-
  497                  * back, above, but must not be transmitted on a network.
  498                  * Also, multicasts addressed to the loopback interface
  499                  * are not sent -- the above call to ip_mloopback() will
  500                  * loop back a copy. ip_input() will drop the copy if
  501                  * this host does not belong to the destination group on
  502                  * the loopback interface.
  503                  */
  504                 if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
  505                         m_freem(m);
  506                         goto done;
  507                 }
  508 
  509                 goto sendit;
  510         }
  511 
  512         /*
  513          * If the source address is not specified yet, use the address
  514          * of the outoing interface.
  515          */
  516         if (ip->ip_src.s_addr == INADDR_ANY) {
  517                 /* Interface may have no addresses. */
  518                 if (ia != NULL) {
  519                         ip->ip_src = IA_SIN(ia)->sin_addr;
  520                 }
  521         }
  522 
  523         /*
  524          * Look for broadcast address and
  525          * verify user is allowed to send
  526          * such a packet.
  527          */
  528         if (isbroadcast) {
  529                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
  530                         error = EADDRNOTAVAIL;
  531                         goto bad;
  532                 }
  533                 if ((flags & IP_ALLOWBROADCAST) == 0) {
  534                         error = EACCES;
  535                         goto bad;
  536                 }
  537                 /* don't allow broadcast messages to be fragmented */
  538                 if (ip_len > mtu) {
  539                         error = EMSGSIZE;
  540                         goto bad;
  541                 }
  542                 m->m_flags |= M_BCAST;
  543         } else {
  544                 m->m_flags &= ~M_BCAST;
  545         }
  546 
  547 sendit:
  548 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
  549         if (IPSEC_ENABLED(ipv4)) {
  550                 if ((error = IPSEC_OUTPUT(ipv4, m, inp)) != 0) {
  551                         if (error == EINPROGRESS)
  552                                 error = 0;
  553                         goto done;
  554                 }
  555         }
  556         /*
  557          * Check if there was a route for this packet; return error if not.
  558          */
  559         if (no_route_but_check_spd) {
  560                 IPSTAT_INC(ips_noroute);
  561                 error = EHOSTUNREACH;
  562                 goto bad;
  563         }
  564         /* Update variables that are affected by ipsec4_output(). */
  565         ip = mtod(m, struct ip *);
  566         hlen = ip->ip_hl << 2;
  567 #endif /* IPSEC */
  568 
  569         /* Jump over all PFIL processing if hooks are not active. */
  570         if (PFIL_HOOKED(&V_inet_pfil_hook)) {
  571                 switch (ip_output_pfil(&m, ifp, inp, dst, &fibnum, &error)) {
  572                 case 1: /* Finished */
  573                         goto done;
  574 
  575                 case 0: /* Continue normally */
  576                         ip = mtod(m, struct ip *);
  577                         break;
  578 
  579                 case -1: /* Need to try again */
  580                         /* Reset everything for a new round */
  581                         RO_RTFREE(ro);
  582                         ro->ro_prepend = NULL;
  583                         rte = NULL;
  584                         gw = dst;
  585                         ip = mtod(m, struct ip *);
  586                         goto again;
  587 
  588                 }
  589         }
  590 
  591         /* 127/8 must not appear on wire - RFC1122. */
  592         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
  593             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
  594                 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
  595                         IPSTAT_INC(ips_badaddr);
  596                         error = EADDRNOTAVAIL;
  597                         goto bad;
  598                 }
  599         }
  600 
  601         m->m_pkthdr.csum_flags |= CSUM_IP;
  602         if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA & ~ifp->if_hwassist) {
  603                 in_delayed_cksum(m);
  604                 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
  605         }
  606 #ifdef SCTP
  607         if (m->m_pkthdr.csum_flags & CSUM_SCTP & ~ifp->if_hwassist) {
  608                 sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
  609                 m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
  610         }
  611 #endif
  612 
  613         /*
  614          * If small enough for interface, or the interface will take
  615          * care of the fragmentation for us, we can just send directly.
  616          */
  617         if (ip_len <= mtu ||
  618             (m->m_pkthdr.csum_flags & ifp->if_hwassist & CSUM_TSO) != 0) {
  619                 ip->ip_sum = 0;
  620                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~ifp->if_hwassist) {
  621                         ip->ip_sum = in_cksum(m, hlen);
  622                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
  623                 }
  624 
  625                 /*
  626                  * Record statistics for this interface address.
  627                  * With CSUM_TSO the byte/packet count will be slightly
  628                  * incorrect because we count the IP+TCP headers only
  629                  * once instead of for every generated packet.
  630                  */
  631                 if (!(flags & IP_FORWARDING) && ia) {
  632                         if (m->m_pkthdr.csum_flags & CSUM_TSO)
  633                                 counter_u64_add(ia->ia_ifa.ifa_opackets,
  634                                     m->m_pkthdr.len / m->m_pkthdr.tso_segsz);
  635                         else
  636                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
  637 
  638                         counter_u64_add(ia->ia_ifa.ifa_obytes, m->m_pkthdr.len);
  639                 }
  640 #ifdef MBUF_STRESS_TEST
  641                 if (mbuf_frag_size && m->m_pkthdr.len > mbuf_frag_size)
  642                         m = m_fragment(m, M_NOWAIT, mbuf_frag_size);
  643 #endif
  644                 /*
  645                  * Reset layer specific mbuf flags
  646                  * to avoid confusing lower layers.
  647                  */
  648                 m_clrprotoflags(m);
  649                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
  650 #ifdef RATELIMIT
  651                 if (inp != NULL) {
  652                         if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
  653                                 in_pcboutput_txrtlmt(inp, ifp, m);
  654                         /* stamp send tag on mbuf */
  655                         m->m_pkthdr.snd_tag = inp->inp_snd_tag;
  656                 } else {
  657                         m->m_pkthdr.snd_tag = NULL;
  658                 }
  659 #endif
  660                 error = (*ifp->if_output)(ifp, m,
  661                     (const struct sockaddr *)gw, ro);
  662 #ifdef RATELIMIT
  663                 /* check for route change */
  664                 if (error == EAGAIN)
  665                         in_pcboutput_eagain(inp);
  666 #endif
  667                 goto done;
  668         }
  669 
  670         /* Balk when DF bit is set or the interface didn't support TSO. */
  671         if ((ip_off & IP_DF) || (m->m_pkthdr.csum_flags & CSUM_TSO)) {
  672                 error = EMSGSIZE;
  673                 IPSTAT_INC(ips_cantfrag);
  674                 goto bad;
  675         }
  676 
  677         /*
  678          * Too large for interface; fragment if possible. If successful,
  679          * on return, m will point to a list of packets to be sent.
  680          */
  681         error = ip_fragment(ip, &m, mtu, ifp->if_hwassist);
  682         if (error)
  683                 goto bad;
  684         for (; m; m = m0) {
  685                 m0 = m->m_nextpkt;
  686                 m->m_nextpkt = 0;
  687                 if (error == 0) {
  688                         /* Record statistics for this interface address. */
  689                         if (ia != NULL) {
  690                                 counter_u64_add(ia->ia_ifa.ifa_opackets, 1);
  691                                 counter_u64_add(ia->ia_ifa.ifa_obytes,
  692                                     m->m_pkthdr.len);
  693                         }
  694                         /*
  695                          * Reset layer specific mbuf flags
  696                          * to avoid confusing upper layers.
  697                          */
  698                         m_clrprotoflags(m);
  699 
  700                         IP_PROBE(send, NULL, NULL, mtod(m, struct ip *), ifp,
  701                             mtod(m, struct ip *), NULL);
  702 #ifdef RATELIMIT
  703                         if (inp != NULL) {
  704                                 if (inp->inp_flags2 & INP_RATE_LIMIT_CHANGED)
  705                                         in_pcboutput_txrtlmt(inp, ifp, m);
  706                                 /* stamp send tag on mbuf */
  707                                 m->m_pkthdr.snd_tag = inp->inp_snd_tag;
  708                         } else {
  709                                 m->m_pkthdr.snd_tag = NULL;
  710                         }
  711 #endif
  712                         error = (*ifp->if_output)(ifp, m,
  713                             (const struct sockaddr *)gw, ro);
  714 #ifdef RATELIMIT
  715                         /* check for route change */
  716                         if (error == EAGAIN)
  717                                 in_pcboutput_eagain(inp);
  718 #endif
  719                 } else
  720                         m_freem(m);
  721         }
  722 
  723         if (error == 0)
  724                 IPSTAT_INC(ips_fragmented);
  725 
  726 done:
  727         if (ro == &iproute)
  728                 RO_RTFREE(ro);
  729         else if (rte == NULL)
  730                 /*
  731                  * If the caller supplied a route but somehow the reference
  732                  * to it has been released need to prevent the caller
  733                  * calling RTFREE on it again.
  734                  */
  735                 ro->ro_rt = NULL;
  736         NET_EPOCH_EXIT();
  737         return (error);
  738  bad:
  739         m_freem(m);
  740         goto done;
  741 }
  742 
  743 /*
  744  * Create a chain of fragments which fit the given mtu. m_frag points to the
  745  * mbuf to be fragmented; on return it points to the chain with the fragments.
  746  * Return 0 if no error. If error, m_frag may contain a partially built
  747  * chain of fragments that should be freed by the caller.
  748  *
  749  * if_hwassist_flags is the hw offload capabilities (see if_data.ifi_hwassist)
  750  */
  751 int
  752 ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
  753     u_long if_hwassist_flags)
  754 {
  755         int error = 0;
  756         int hlen = ip->ip_hl << 2;
  757         int len = (mtu - hlen) & ~7;    /* size of payload in each fragment */
  758         int off;
  759         struct mbuf *m0 = *m_frag;      /* the original packet          */
  760         int firstlen;
  761         struct mbuf **mnext;
  762         int nfrags;
  763         uint16_t ip_len, ip_off;
  764 
  765         ip_len = ntohs(ip->ip_len);
  766         ip_off = ntohs(ip->ip_off);
  767 
  768         if (ip_off & IP_DF) {   /* Fragmentation not allowed */
  769                 IPSTAT_INC(ips_cantfrag);
  770                 return EMSGSIZE;
  771         }
  772 
  773         /*
  774          * Must be able to put at least 8 bytes per fragment.
  775          */
  776         if (len < 8)
  777                 return EMSGSIZE;
  778 
  779         /*
  780          * If the interface will not calculate checksums on
  781          * fragmented packets, then do it here.
  782          */
  783         if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
  784                 in_delayed_cksum(m0);
  785                 m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
  786         }
  787 #ifdef SCTP
  788         if (m0->m_pkthdr.csum_flags & CSUM_SCTP) {
  789                 sctp_delayed_cksum(m0, hlen);
  790                 m0->m_pkthdr.csum_flags &= ~CSUM_SCTP;
  791         }
  792 #endif
  793         if (len > PAGE_SIZE) {
  794                 /*
  795                  * Fragment large datagrams such that each segment
  796                  * contains a multiple of PAGE_SIZE amount of data,
  797                  * plus headers. This enables a receiver to perform
  798                  * page-flipping zero-copy optimizations.
  799                  *
  800                  * XXX When does this help given that sender and receiver
  801                  * could have different page sizes, and also mtu could
  802                  * be less than the receiver's page size ?
  803                  */
  804                 int newlen;
  805 
  806                 off = MIN(mtu, m0->m_pkthdr.len);
  807 
  808                 /*
  809                  * firstlen (off - hlen) must be aligned on an
  810                  * 8-byte boundary
  811                  */
  812                 if (off < hlen)
  813                         goto smart_frag_failure;
  814                 off = ((off - hlen) & ~7) + hlen;
  815                 newlen = (~PAGE_MASK) & mtu;
  816                 if ((newlen + sizeof (struct ip)) > mtu) {
  817                         /* we failed, go back the default */
  818 smart_frag_failure:
  819                         newlen = len;
  820                         off = hlen + len;
  821                 }
  822                 len = newlen;
  823 
  824         } else {
  825                 off = hlen + len;
  826         }
  827 
  828         firstlen = off - hlen;
  829         mnext = &m0->m_nextpkt;         /* pointer to next packet */
  830 
  831         /*
  832          * Loop through length of segment after first fragment,
  833          * make new header and copy data of each part and link onto chain.
  834          * Here, m0 is the original packet, m is the fragment being created.
  835          * The fragments are linked off the m_nextpkt of the original
  836          * packet, which after processing serves as the first fragment.
  837          */
  838         for (nfrags = 1; off < ip_len; off += len, nfrags++) {
  839                 struct ip *mhip;        /* ip header on the fragment */
  840                 struct mbuf *m;
  841                 int mhlen = sizeof (struct ip);
  842 
  843                 m = m_gethdr(M_NOWAIT, MT_DATA);
  844                 if (m == NULL) {
  845                         error = ENOBUFS;
  846                         IPSTAT_INC(ips_odropped);
  847                         goto done;
  848                 }
  849                 /*
  850                  * Make sure the complete packet header gets copied
  851                  * from the originating mbuf to the newly created
  852                  * mbuf. This also ensures that existing firewall
  853                  * classification(s), VLAN tags and so on get copied
  854                  * to the resulting fragmented packet(s):
  855                  */
  856                 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) {
  857                         m_free(m);
  858                         error = ENOBUFS;
  859                         IPSTAT_INC(ips_odropped);
  860                         goto done;
  861                 }
  862                 /*
  863                  * In the first mbuf, leave room for the link header, then
  864                  * copy the original IP header including options. The payload
  865                  * goes into an additional mbuf chain returned by m_copym().
  866                  */
  867                 m->m_data += max_linkhdr;
  868                 mhip = mtod(m, struct ip *);
  869                 *mhip = *ip;
  870                 if (hlen > sizeof (struct ip)) {
  871                         mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
  872                         mhip->ip_v = IPVERSION;
  873                         mhip->ip_hl = mhlen >> 2;
  874                 }
  875                 m->m_len = mhlen;
  876                 /* XXX do we need to add ip_off below ? */
  877                 mhip->ip_off = ((off - hlen) >> 3) + ip_off;
  878                 if (off + len >= ip_len)
  879                         len = ip_len - off;
  880                 else
  881                         mhip->ip_off |= IP_MF;
  882                 mhip->ip_len = htons((u_short)(len + mhlen));
  883                 m->m_next = m_copym(m0, off, len, M_NOWAIT);
  884                 if (m->m_next == NULL) {        /* copy failed */
  885                         m_free(m);
  886                         error = ENOBUFS;        /* ??? */
  887                         IPSTAT_INC(ips_odropped);
  888                         goto done;
  889                 }
  890                 m->m_pkthdr.len = mhlen + len;
  891 #ifdef MAC
  892                 mac_netinet_fragment(m0, m);
  893 #endif
  894                 mhip->ip_off = htons(mhip->ip_off);
  895                 mhip->ip_sum = 0;
  896                 if (m->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
  897                         mhip->ip_sum = in_cksum(m, mhlen);
  898                         m->m_pkthdr.csum_flags &= ~CSUM_IP;
  899                 }
  900                 *mnext = m;
  901                 mnext = &m->m_nextpkt;
  902         }
  903         IPSTAT_ADD(ips_ofragments, nfrags);
  904 
  905         /*
  906          * Update first fragment by trimming what's been copied out
  907          * and updating header.
  908          */
  909         m_adj(m0, hlen + firstlen - ip_len);
  910         m0->m_pkthdr.len = hlen + firstlen;
  911         ip->ip_len = htons((u_short)m0->m_pkthdr.len);
  912         ip->ip_off = htons(ip_off | IP_MF);
  913         ip->ip_sum = 0;
  914         if (m0->m_pkthdr.csum_flags & CSUM_IP & ~if_hwassist_flags) {
  915                 ip->ip_sum = in_cksum(m0, hlen);
  916                 m0->m_pkthdr.csum_flags &= ~CSUM_IP;
  917         }
  918 
  919 done:
  920         *m_frag = m0;
  921         return error;
  922 }
  923 
  924 void
  925 in_delayed_cksum(struct mbuf *m)
  926 {
  927         struct ip *ip;
  928         struct udphdr *uh;
  929         uint16_t cklen, csum, offset;
  930 
  931         ip = mtod(m, struct ip *);
  932         offset = ip->ip_hl << 2 ;
  933 
  934         if (m->m_pkthdr.csum_flags & CSUM_UDP) {
  935                 /* if udp header is not in the first mbuf copy udplen */
  936                 if (offset + sizeof(struct udphdr) > m->m_len) {
  937                         m_copydata(m, offset + offsetof(struct udphdr,
  938                             uh_ulen), sizeof(cklen), (caddr_t)&cklen);
  939                         cklen = ntohs(cklen);
  940                 } else {
  941                         uh = (struct udphdr *)mtodo(m, offset);
  942                         cklen = ntohs(uh->uh_ulen);
  943                 }
  944                 csum = in_cksum_skip(m, cklen + offset, offset);
  945                 if (csum == 0)
  946                         csum = 0xffff;
  947         } else {
  948                 cklen = ntohs(ip->ip_len);
  949                 csum = in_cksum_skip(m, cklen, offset);
  950         }
  951         offset += m->m_pkthdr.csum_data;        /* checksum offset */
  952 
  953         if (offset + sizeof(csum) > m->m_len)
  954                 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum);
  955         else
  956                 *(u_short *)mtodo(m, offset) = csum;
  957 }
  958 
  959 /*
  960  * IP socket option processing.
  961  */
  962 int
  963 ip_ctloutput(struct socket *so, struct sockopt *sopt)
  964 {
  965         struct  inpcb *inp = sotoinpcb(so);
  966         int     error, optval;
  967 #ifdef  RSS
  968         uint32_t rss_bucket;
  969         int retval;
  970 #endif
  971 
  972         error = optval = 0;
  973         if (sopt->sopt_level != IPPROTO_IP) {
  974                 error = EINVAL;
  975 
  976                 if (sopt->sopt_level == SOL_SOCKET &&
  977                     sopt->sopt_dir == SOPT_SET) {
  978                         switch (sopt->sopt_name) {
  979                         case SO_REUSEADDR:
  980                                 INP_WLOCK(inp);
  981                                 if ((so->so_options & SO_REUSEADDR) != 0)
  982                                         inp->inp_flags2 |= INP_REUSEADDR;
  983                                 else
  984                                         inp->inp_flags2 &= ~INP_REUSEADDR;
  985                                 INP_WUNLOCK(inp);
  986                                 error = 0;
  987                                 break;
  988                         case SO_REUSEPORT:
  989                                 INP_WLOCK(inp);
  990                                 if ((so->so_options & SO_REUSEPORT) != 0)
  991                                         inp->inp_flags2 |= INP_REUSEPORT;
  992                                 else
  993                                         inp->inp_flags2 &= ~INP_REUSEPORT;
  994                                 INP_WUNLOCK(inp);
  995                                 error = 0;
  996                                 break;
  997                         case SO_REUSEPORT_LB:
  998                                 INP_WLOCK(inp);
  999                                 if ((so->so_options & SO_REUSEPORT_LB) != 0)
 1000                                         inp->inp_flags2 |= INP_REUSEPORT_LB;
 1001                                 else
 1002                                         inp->inp_flags2 &= ~INP_REUSEPORT_LB;
 1003                                 INP_WUNLOCK(inp);
 1004                                 error = 0;
 1005                                 break;
 1006                         case SO_SETFIB:
 1007                                 INP_WLOCK(inp);
 1008                                 inp->inp_inc.inc_fibnum = so->so_fibnum;
 1009                                 INP_WUNLOCK(inp);
 1010                                 error = 0;
 1011                                 break;
 1012                         case SO_MAX_PACING_RATE:
 1013 #ifdef RATELIMIT
 1014                                 INP_WLOCK(inp);
 1015                                 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED;
 1016                                 INP_WUNLOCK(inp);
 1017                                 error = 0;
 1018 #else
 1019                                 error = EOPNOTSUPP;
 1020 #endif
 1021                                 break;
 1022                         default:
 1023                                 break;
 1024                         }
 1025                 }
 1026                 return (error);
 1027         }
 1028 
 1029         switch (sopt->sopt_dir) {
 1030         case SOPT_SET:
 1031                 switch (sopt->sopt_name) {
 1032                 case IP_OPTIONS:
 1033 #ifdef notyet
 1034                 case IP_RETOPTS:
 1035 #endif
 1036                 {
 1037                         struct mbuf *m;
 1038                         if (sopt->sopt_valsize > MLEN) {
 1039                                 error = EMSGSIZE;
 1040                                 break;
 1041                         }
 1042                         m = m_get(sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_DATA);
 1043                         if (m == NULL) {
 1044                                 error = ENOBUFS;
 1045                                 break;
 1046                         }
 1047                         m->m_len = sopt->sopt_valsize;
 1048                         error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
 1049                                             m->m_len);
 1050                         if (error) {
 1051                                 m_free(m);
 1052                                 break;
 1053                         }
 1054                         INP_WLOCK(inp);
 1055                         error = ip_pcbopts(inp, sopt->sopt_name, m);
 1056                         INP_WUNLOCK(inp);
 1057                         return (error);
 1058                 }
 1059 
 1060                 case IP_BINDANY:
 1061                         if (sopt->sopt_td != NULL) {
 1062                                 error = priv_check(sopt->sopt_td,
 1063                                     PRIV_NETINET_BINDANY);
 1064                                 if (error)
 1065                                         break;
 1066                         }
 1067                         /* FALLTHROUGH */
 1068                 case IP_BINDMULTI:
 1069 #ifdef  RSS
 1070                 case IP_RSS_LISTEN_BUCKET:
 1071 #endif
 1072                 case IP_TOS:
 1073                 case IP_TTL:
 1074                 case IP_MINTTL:
 1075                 case IP_RECVOPTS:
 1076                 case IP_RECVRETOPTS:
 1077                 case IP_ORIGDSTADDR:
 1078                 case IP_RECVDSTADDR:
 1079                 case IP_RECVTTL:
 1080                 case IP_RECVIF:
 1081                 case IP_ONESBCAST:
 1082                 case IP_DONTFRAG:
 1083                 case IP_RECVTOS:
 1084                 case IP_RECVFLOWID:
 1085 #ifdef  RSS
 1086                 case IP_RECVRSSBUCKETID:
 1087 #endif
 1088                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1089                                             sizeof optval);
 1090                         if (error)
 1091                                 break;
 1092 
 1093                         switch (sopt->sopt_name) {
 1094                         case IP_TOS:
 1095                                 inp->inp_ip_tos = optval;
 1096                                 break;
 1097 
 1098                         case IP_TTL:
 1099                                 inp->inp_ip_ttl = optval;
 1100                                 break;
 1101 
 1102                         case IP_MINTTL:
 1103                                 if (optval >= 0 && optval <= MAXTTL)
 1104                                         inp->inp_ip_minttl = optval;
 1105                                 else
 1106                                         error = EINVAL;
 1107                                 break;
 1108 
 1109 #define OPTSET(bit) do {                                                \
 1110         INP_WLOCK(inp);                                                 \
 1111         if (optval)                                                     \
 1112                 inp->inp_flags |= bit;                                  \
 1113         else                                                            \
 1114                 inp->inp_flags &= ~bit;                                 \
 1115         INP_WUNLOCK(inp);                                               \
 1116 } while (0)
 1117 
 1118 #define OPTSET2(bit, val) do {                                          \
 1119         INP_WLOCK(inp);                                                 \
 1120         if (val)                                                        \
 1121                 inp->inp_flags2 |= bit;                                 \
 1122         else                                                            \
 1123                 inp->inp_flags2 &= ~bit;                                \
 1124         INP_WUNLOCK(inp);                                               \
 1125 } while (0)
 1126 
 1127                         case IP_RECVOPTS:
 1128                                 OPTSET(INP_RECVOPTS);
 1129                                 break;
 1130 
 1131                         case IP_RECVRETOPTS:
 1132                                 OPTSET(INP_RECVRETOPTS);
 1133                                 break;
 1134 
 1135                         case IP_RECVDSTADDR:
 1136                                 OPTSET(INP_RECVDSTADDR);
 1137                                 break;
 1138 
 1139                         case IP_ORIGDSTADDR:
 1140                                 OPTSET2(INP_ORIGDSTADDR, optval);
 1141                                 break;
 1142 
 1143                         case IP_RECVTTL:
 1144                                 OPTSET(INP_RECVTTL);
 1145                                 break;
 1146 
 1147                         case IP_RECVIF:
 1148                                 OPTSET(INP_RECVIF);
 1149                                 break;
 1150 
 1151                         case IP_ONESBCAST:
 1152                                 OPTSET(INP_ONESBCAST);
 1153                                 break;
 1154                         case IP_DONTFRAG:
 1155                                 OPTSET(INP_DONTFRAG);
 1156                                 break;
 1157                         case IP_BINDANY:
 1158                                 OPTSET(INP_BINDANY);
 1159                                 break;
 1160                         case IP_RECVTOS:
 1161                                 OPTSET(INP_RECVTOS);
 1162                                 break;
 1163                         case IP_BINDMULTI:
 1164                                 OPTSET2(INP_BINDMULTI, optval);
 1165                                 break;
 1166                         case IP_RECVFLOWID:
 1167                                 OPTSET2(INP_RECVFLOWID, optval);
 1168                                 break;
 1169 #ifdef  RSS
 1170                         case IP_RSS_LISTEN_BUCKET:
 1171                                 if ((optval >= 0) &&
 1172                                     (optval < rss_getnumbuckets())) {
 1173                                         inp->inp_rss_listen_bucket = optval;
 1174                                         OPTSET2(INP_RSS_BUCKET_SET, 1);
 1175                                 } else {
 1176                                         error = EINVAL;
 1177                                 }
 1178                                 break;
 1179                         case IP_RECVRSSBUCKETID:
 1180                                 OPTSET2(INP_RECVRSSBUCKETID, optval);
 1181                                 break;
 1182 #endif
 1183                         }
 1184                         break;
 1185 #undef OPTSET
 1186 #undef OPTSET2
 1187 
 1188                 /*
 1189                  * Multicast socket options are processed by the in_mcast
 1190                  * module.
 1191                  */
 1192                 case IP_MULTICAST_IF:
 1193                 case IP_MULTICAST_VIF:
 1194                 case IP_MULTICAST_TTL:
 1195                 case IP_MULTICAST_LOOP:
 1196                 case IP_ADD_MEMBERSHIP:
 1197                 case IP_DROP_MEMBERSHIP:
 1198                 case IP_ADD_SOURCE_MEMBERSHIP:
 1199                 case IP_DROP_SOURCE_MEMBERSHIP:
 1200                 case IP_BLOCK_SOURCE:
 1201                 case IP_UNBLOCK_SOURCE:
 1202                 case IP_MSFILTER:
 1203                 case MCAST_JOIN_GROUP:
 1204                 case MCAST_LEAVE_GROUP:
 1205                 case MCAST_JOIN_SOURCE_GROUP:
 1206                 case MCAST_LEAVE_SOURCE_GROUP:
 1207                 case MCAST_BLOCK_SOURCE:
 1208                 case MCAST_UNBLOCK_SOURCE:
 1209                         error = inp_setmoptions(inp, sopt);
 1210                         break;
 1211 
 1212                 case IP_PORTRANGE:
 1213                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1214                                             sizeof optval);
 1215                         if (error)
 1216                                 break;
 1217 
 1218                         INP_WLOCK(inp);
 1219                         switch (optval) {
 1220                         case IP_PORTRANGE_DEFAULT:
 1221                                 inp->inp_flags &= ~(INP_LOWPORT);
 1222                                 inp->inp_flags &= ~(INP_HIGHPORT);
 1223                                 break;
 1224 
 1225                         case IP_PORTRANGE_HIGH:
 1226                                 inp->inp_flags &= ~(INP_LOWPORT);
 1227                                 inp->inp_flags |= INP_HIGHPORT;
 1228                                 break;
 1229 
 1230                         case IP_PORTRANGE_LOW:
 1231                                 inp->inp_flags &= ~(INP_HIGHPORT);
 1232                                 inp->inp_flags |= INP_LOWPORT;
 1233                                 break;
 1234 
 1235                         default:
 1236                                 error = EINVAL;
 1237                                 break;
 1238                         }
 1239                         INP_WUNLOCK(inp);
 1240                         break;
 1241 
 1242 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 1243                 case IP_IPSEC_POLICY:
 1244                         if (IPSEC_ENABLED(ipv4)) {
 1245                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
 1246                                 break;
 1247                         }
 1248                         /* FALLTHROUGH */
 1249 #endif /* IPSEC */
 1250 
 1251                 default:
 1252                         error = ENOPROTOOPT;
 1253                         break;
 1254                 }
 1255                 break;
 1256 
 1257         case SOPT_GET:
 1258                 switch (sopt->sopt_name) {
 1259                 case IP_OPTIONS:
 1260                 case IP_RETOPTS:
 1261                         INP_RLOCK(inp);
 1262                         if (inp->inp_options) {
 1263                                 struct mbuf *options;
 1264 
 1265                                 options = m_dup(inp->inp_options, M_NOWAIT);
 1266                                 INP_RUNLOCK(inp);
 1267                                 if (options != NULL) {
 1268                                         error = sooptcopyout(sopt,
 1269                                                              mtod(options, char *),
 1270                                                              options->m_len);
 1271                                         m_freem(options);
 1272                                 } else
 1273                                         error = ENOMEM;
 1274                         } else {
 1275                                 INP_RUNLOCK(inp);
 1276                                 sopt->sopt_valsize = 0;
 1277                         }
 1278                         break;
 1279 
 1280                 case IP_TOS:
 1281                 case IP_TTL:
 1282                 case IP_MINTTL:
 1283                 case IP_RECVOPTS:
 1284                 case IP_RECVRETOPTS:
 1285                 case IP_ORIGDSTADDR:
 1286                 case IP_RECVDSTADDR:
 1287                 case IP_RECVTTL:
 1288                 case IP_RECVIF:
 1289                 case IP_PORTRANGE:
 1290                 case IP_ONESBCAST:
 1291                 case IP_DONTFRAG:
 1292                 case IP_BINDANY:
 1293                 case IP_RECVTOS:
 1294                 case IP_BINDMULTI:
 1295                 case IP_FLOWID:
 1296                 case IP_FLOWTYPE:
 1297                 case IP_RECVFLOWID:
 1298 #ifdef  RSS
 1299                 case IP_RSSBUCKETID:
 1300                 case IP_RECVRSSBUCKETID:
 1301 #endif
 1302                         switch (sopt->sopt_name) {
 1303 
 1304                         case IP_TOS:
 1305                                 optval = inp->inp_ip_tos;
 1306                                 break;
 1307 
 1308                         case IP_TTL:
 1309                                 optval = inp->inp_ip_ttl;
 1310                                 break;
 1311 
 1312                         case IP_MINTTL:
 1313                                 optval = inp->inp_ip_minttl;
 1314                                 break;
 1315 
 1316 #define OPTBIT(bit)     (inp->inp_flags & bit ? 1 : 0)
 1317 #define OPTBIT2(bit)    (inp->inp_flags2 & bit ? 1 : 0)
 1318 
 1319                         case IP_RECVOPTS:
 1320                                 optval = OPTBIT(INP_RECVOPTS);
 1321                                 break;
 1322 
 1323                         case IP_RECVRETOPTS:
 1324                                 optval = OPTBIT(INP_RECVRETOPTS);
 1325                                 break;
 1326 
 1327                         case IP_RECVDSTADDR:
 1328                                 optval = OPTBIT(INP_RECVDSTADDR);
 1329                                 break;
 1330 
 1331                         case IP_ORIGDSTADDR:
 1332                                 optval = OPTBIT2(INP_ORIGDSTADDR);
 1333                                 break;
 1334 
 1335                         case IP_RECVTTL:
 1336                                 optval = OPTBIT(INP_RECVTTL);
 1337                                 break;
 1338 
 1339                         case IP_RECVIF:
 1340                                 optval = OPTBIT(INP_RECVIF);
 1341                                 break;
 1342 
 1343                         case IP_PORTRANGE:
 1344                                 if (inp->inp_flags & INP_HIGHPORT)
 1345                                         optval = IP_PORTRANGE_HIGH;
 1346                                 else if (inp->inp_flags & INP_LOWPORT)
 1347                                         optval = IP_PORTRANGE_LOW;
 1348                                 else
 1349                                         optval = 0;
 1350                                 break;
 1351 
 1352                         case IP_ONESBCAST:
 1353                                 optval = OPTBIT(INP_ONESBCAST);
 1354                                 break;
 1355                         case IP_DONTFRAG:
 1356                                 optval = OPTBIT(INP_DONTFRAG);
 1357                                 break;
 1358                         case IP_BINDANY:
 1359                                 optval = OPTBIT(INP_BINDANY);
 1360                                 break;
 1361                         case IP_RECVTOS:
 1362                                 optval = OPTBIT(INP_RECVTOS);
 1363                                 break;
 1364                         case IP_FLOWID:
 1365                                 optval = inp->inp_flowid;
 1366                                 break;
 1367                         case IP_FLOWTYPE:
 1368                                 optval = inp->inp_flowtype;
 1369                                 break;
 1370                         case IP_RECVFLOWID:
 1371                                 optval = OPTBIT2(INP_RECVFLOWID);
 1372                                 break;
 1373 #ifdef  RSS
 1374                         case IP_RSSBUCKETID:
 1375                                 retval = rss_hash2bucket(inp->inp_flowid,
 1376                                     inp->inp_flowtype,
 1377                                     &rss_bucket);
 1378                                 if (retval == 0)
 1379                                         optval = rss_bucket;
 1380                                 else
 1381                                         error = EINVAL;
 1382                                 break;
 1383                         case IP_RECVRSSBUCKETID:
 1384                                 optval = OPTBIT2(INP_RECVRSSBUCKETID);
 1385                                 break;
 1386 #endif
 1387                         case IP_BINDMULTI:
 1388                                 optval = OPTBIT2(INP_BINDMULTI);
 1389                                 break;
 1390                         }
 1391                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1392                         break;
 1393 
 1394                 /*
 1395                  * Multicast socket options are processed by the in_mcast
 1396                  * module.
 1397                  */
 1398                 case IP_MULTICAST_IF:
 1399                 case IP_MULTICAST_VIF:
 1400                 case IP_MULTICAST_TTL:
 1401                 case IP_MULTICAST_LOOP:
 1402                 case IP_MSFILTER:
 1403                         error = inp_getmoptions(inp, sopt);
 1404                         break;
 1405 
 1406 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
 1407                 case IP_IPSEC_POLICY:
 1408                         if (IPSEC_ENABLED(ipv4)) {
 1409                                 error = IPSEC_PCBCTL(ipv4, inp, sopt);
 1410                                 break;
 1411                         }
 1412                         /* FALLTHROUGH */
 1413 #endif /* IPSEC */
 1414 
 1415                 default:
 1416                         error = ENOPROTOOPT;
 1417                         break;
 1418                 }
 1419                 break;
 1420         }
 1421         return (error);
 1422 }
 1423 
 1424 /*
 1425  * Routine called from ip_output() to loop back a copy of an IP multicast
 1426  * packet to the input queue of a specified interface.  Note that this
 1427  * calls the output routine of the loopback "driver", but with an interface
 1428  * pointer that might NOT be a loopback interface -- evil, but easier than
 1429  * replicating that code here.
 1430  */
 1431 static void
 1432 ip_mloopback(struct ifnet *ifp, const struct mbuf *m, int hlen)
 1433 {
 1434         struct ip *ip;
 1435         struct mbuf *copym;
 1436 
 1437         /*
 1438          * Make a deep copy of the packet because we're going to
 1439          * modify the pack in order to generate checksums.
 1440          */
 1441         copym = m_dup(m, M_NOWAIT);
 1442         if (copym != NULL && (!M_WRITABLE(copym) || copym->m_len < hlen))
 1443                 copym = m_pullup(copym, hlen);
 1444         if (copym != NULL) {
 1445                 /* If needed, compute the checksum and mark it as valid. */
 1446                 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
 1447                         in_delayed_cksum(copym);
 1448                         copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
 1449                         copym->m_pkthdr.csum_flags |=
 1450                             CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
 1451                         copym->m_pkthdr.csum_data = 0xffff;
 1452                 }
 1453                 /*
 1454                  * We don't bother to fragment if the IP length is greater
 1455                  * than the interface's MTU.  Can this possibly matter?
 1456                  */
 1457                 ip = mtod(copym, struct ip *);
 1458                 ip->ip_sum = 0;
 1459                 ip->ip_sum = in_cksum(copym, hlen);
 1460                 if_simloop(ifp, copym, AF_INET, 0);
 1461         }
 1462 }

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