The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_fastfwd.c

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    1 /*-
    2  * Copyright (c) 2003 Andre Oppermann, Internet Business Solutions AG
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. The name of the author may not be used to endorse or promote
   14  *    products derived from this software without specific prior written
   15  *    permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 /*
   31  * ip_fastforward gets its speed from processing the forwarded packet to
   32  * completion (if_output on the other side) without any queues or netisr's.
   33  * The receiving interface DMAs the packet into memory, the upper half of
   34  * driver calls ip_fastforward, we do our routing table lookup and directly
   35  * send it off to the outgoing interface, which DMAs the packet to the
   36  * network card. The only part of the packet we touch with the CPU is the
   37  * IP header (unless there are complex firewall rules touching other parts
   38  * of the packet, but that is up to you). We are essentially limited by bus
   39  * bandwidth and how fast the network card/driver can set up receives and
   40  * transmits.
   41  *
   42  * We handle basic errors, IP header errors, checksum errors,
   43  * destination unreachable, fragmentation and fragmentation needed and
   44  * report them via ICMP to the sender.
   45  *
   46  * Else if something is not pure IPv4 unicast forwarding we fall back to
   47  * the normal ip_input processing path. We should only be called from
   48  * interfaces connected to the outside world.
   49  *
   50  * Firewalling is fully supported including divert, ipfw fwd and ipfilter
   51  * ipnat and address rewrite.
   52  *
   53  * IPSEC is not supported if this host is a tunnel broker. IPSEC is
   54  * supported for connections to/from local host.
   55  *
   56  * We try to do the least expensive (in CPU ops) checks and operations
   57  * first to catch junk with as little overhead as possible.
   58  * 
   59  * We take full advantage of hardware support for IP checksum and
   60  * fragmentation offloading.
   61  *
   62  * We don't do ICMP redirect in the fast forwarding path. I have had my own
   63  * cases where two core routers with Zebra routing suite would send millions
   64  * ICMP redirects to connected hosts if the destination router was not the
   65  * default gateway. In one case it was filling the routing table of a host
   66  * with approximately 300.000 cloned redirect entries until it ran out of
   67  * kernel memory. However the networking code proved very robust and it didn't
   68  * crash or fail in other ways.
   69  */
   70 
   71 /*
   72  * Many thanks to Matt Thomas of NetBSD for basic structure of ip_flow.c which
   73  * is being followed here.
   74  */
   75 
   76 #include <sys/cdefs.h>
   77 __FBSDID("$FreeBSD: releng/10.3/sys/netinet/ip_fastfwd.c 295896 2016-02-22 19:17:59Z gnn $");
   78 
   79 #include "opt_ipfw.h"
   80 #include "opt_ipstealth.h"
   81 #include "opt_kdtrace.h"
   82 
   83 #include <sys/param.h>
   84 #include <sys/systm.h>
   85 #include <sys/kernel.h>
   86 #include <sys/malloc.h>
   87 #include <sys/mbuf.h>
   88 #include <sys/protosw.h>
   89 #include <sys/sdt.h>
   90 #include <sys/socket.h>
   91 #include <sys/sysctl.h>
   92 
   93 #include <net/pfil.h>
   94 #include <net/if.h>
   95 #include <net/if_types.h>
   96 #include <net/if_var.h>
   97 #include <net/if_dl.h>
   98 #include <net/route.h>
   99 #include <net/vnet.h>
  100 
  101 #include <netinet/in.h>
  102 #include <netinet/in_kdtrace.h>
  103 #include <netinet/in_systm.h>
  104 #include <netinet/in_var.h>
  105 #include <netinet/ip.h>
  106 #include <netinet/ip_var.h>
  107 #include <netinet/ip_icmp.h>
  108 #include <netinet/ip_options.h>
  109 
  110 #include <machine/in_cksum.h>
  111 
  112 static VNET_DEFINE(int, ipfastforward_active);
  113 #define V_ipfastforward_active          VNET(ipfastforward_active)
  114 
  115 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, fastforwarding, CTLFLAG_RW,
  116     &VNET_NAME(ipfastforward_active), 0, "Enable fast IP forwarding");
  117 
  118 static struct sockaddr_in *
  119 ip_findroute(struct route *ro, struct in_addr dest, struct mbuf *m)
  120 {
  121         struct sockaddr_in *dst;
  122         struct rtentry *rt;
  123 
  124         /*
  125          * Find route to destination.
  126          */
  127         bzero(ro, sizeof(*ro));
  128         dst = (struct sockaddr_in *)&ro->ro_dst;
  129         dst->sin_family = AF_INET;
  130         dst->sin_len = sizeof(*dst);
  131         dst->sin_addr.s_addr = dest.s_addr;
  132         in_rtalloc_ign(ro, 0, M_GETFIB(m));
  133 
  134         /*
  135          * Route there and interface still up?
  136          */
  137         rt = ro->ro_rt;
  138         if (rt && (rt->rt_flags & RTF_UP) &&
  139             (rt->rt_ifp->if_flags & IFF_UP) &&
  140             (rt->rt_ifp->if_drv_flags & IFF_DRV_RUNNING)) {
  141                 if (rt->rt_flags & RTF_GATEWAY)
  142                         dst = (struct sockaddr_in *)rt->rt_gateway;
  143         } else {
  144                 IPSTAT_INC(ips_noroute);
  145                 IPSTAT_INC(ips_cantforward);
  146                 if (rt)
  147                         RTFREE(rt);
  148                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
  149                 return NULL;
  150         }
  151         return dst;
  152 }
  153 
  154 /*
  155  * Try to forward a packet based on the destination address.
  156  * This is a fast path optimized for the plain forwarding case.
  157  * If the packet is handled (and consumed) here then we return NULL;
  158  * otherwise mbuf is returned and the packet should be delivered
  159  * to ip_input for full processing.
  160  */
  161 struct mbuf *
  162 ip_fastforward(struct mbuf *m)
  163 {
  164         struct ip *ip;
  165         struct mbuf *m0 = NULL;
  166         struct route ro;
  167         struct sockaddr_in *dst = NULL;
  168         struct ifnet *ifp;
  169         struct in_addr odest, dest;
  170         uint16_t sum, ip_len, ip_off;
  171         int error = 0;
  172         int hlen, mtu;
  173         struct m_tag *fwd_tag = NULL;
  174 
  175         /*
  176          * Are we active and forwarding packets?
  177          */
  178         if (!V_ipfastforward_active || !V_ipforwarding)
  179                 return m;
  180 
  181         M_ASSERTVALID(m);
  182         M_ASSERTPKTHDR(m);
  183 
  184         bzero(&ro, sizeof(ro));
  185 
  186         /*
  187          * Step 1: check for packet drop conditions (and sanity checks)
  188          */
  189 
  190         /*
  191          * Is entire packet big enough?
  192          */
  193         if (m->m_pkthdr.len < sizeof(struct ip)) {
  194                 IPSTAT_INC(ips_tooshort);
  195                 goto drop;
  196         }
  197 
  198         /*
  199          * Is first mbuf large enough for ip header and is header present?
  200          */
  201         if (m->m_len < sizeof (struct ip) &&
  202            (m = m_pullup(m, sizeof (struct ip))) == NULL) {
  203                 IPSTAT_INC(ips_toosmall);
  204                 return NULL;    /* mbuf already free'd */
  205         }
  206 
  207         ip = mtod(m, struct ip *);
  208 
  209         /*
  210          * Is it IPv4?
  211          */
  212         if (ip->ip_v != IPVERSION) {
  213                 IPSTAT_INC(ips_badvers);
  214                 goto drop;
  215         }
  216 
  217         /*
  218          * Is IP header length correct and is it in first mbuf?
  219          */
  220         hlen = ip->ip_hl << 2;
  221         if (hlen < sizeof(struct ip)) { /* minimum header length */
  222                 IPSTAT_INC(ips_badhlen);
  223                 goto drop;
  224         }
  225         if (hlen > m->m_len) {
  226                 if ((m = m_pullup(m, hlen)) == NULL) {
  227                         IPSTAT_INC(ips_badhlen);
  228                         return NULL;    /* mbuf already free'd */
  229                 }
  230                 ip = mtod(m, struct ip *);
  231         }
  232 
  233         /*
  234          * Checksum correct?
  235          */
  236         if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED)
  237                 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
  238         else {
  239                 if (hlen == sizeof(struct ip))
  240                         sum = in_cksum_hdr(ip);
  241                 else
  242                         sum = in_cksum(m, hlen);
  243         }
  244         if (sum) {
  245                 IPSTAT_INC(ips_badsum);
  246                 goto drop;
  247         }
  248 
  249         /*
  250          * Remember that we have checked the IP header and found it valid.
  251          */
  252         m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
  253 
  254         ip_len = ntohs(ip->ip_len);
  255 
  256         /*
  257          * Is IP length longer than packet we have got?
  258          */
  259         if (m->m_pkthdr.len < ip_len) {
  260                 IPSTAT_INC(ips_tooshort);
  261                 goto drop;
  262         }
  263 
  264         /*
  265          * Is packet longer than IP header tells us? If yes, truncate packet.
  266          */
  267         if (m->m_pkthdr.len > ip_len) {
  268                 if (m->m_len == m->m_pkthdr.len) {
  269                         m->m_len = ip_len;
  270                         m->m_pkthdr.len = ip_len;
  271                 } else
  272                         m_adj(m, ip_len - m->m_pkthdr.len);
  273         }
  274 
  275         /*
  276          * Is packet from or to 127/8?
  277          */
  278         if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
  279             (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
  280                 IPSTAT_INC(ips_badaddr);
  281                 goto drop;
  282         }
  283 
  284 #ifdef ALTQ
  285         /*
  286          * Is packet dropped by traffic conditioner?
  287          */
  288         if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0)
  289                 goto drop;
  290 #endif
  291 
  292         /*
  293          * Step 2: fallback conditions to normal ip_input path processing
  294          */
  295 
  296         /*
  297          * Only IP packets without options
  298          */
  299         if (ip->ip_hl != (sizeof(struct ip) >> 2)) {
  300                 if (V_ip_doopts == 1)
  301                         return m;
  302                 else if (V_ip_doopts == 2) {
  303                         icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_FILTER_PROHIB,
  304                                 0, 0);
  305                         return NULL;    /* mbuf already free'd */
  306                 }
  307                 /* else ignore IP options and continue */
  308         }
  309 
  310         /*
  311          * Only unicast IP, not from loopback, no L2 or IP broadcast,
  312          * no multicast, no INADDR_ANY
  313          *
  314          * XXX: Probably some of these checks could be direct drop
  315          * conditions.  However it is not clear whether there are some
  316          * hacks or obscure behaviours which make it neccessary to
  317          * let ip_input handle it.  We play safe here and let ip_input
  318          * deal with it until it is proven that we can directly drop it.
  319          */
  320         if ((m->m_flags & (M_BCAST|M_MCAST)) ||
  321             (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) ||
  322             ntohl(ip->ip_src.s_addr) == (u_long)INADDR_BROADCAST ||
  323             ntohl(ip->ip_dst.s_addr) == (u_long)INADDR_BROADCAST ||
  324             IN_MULTICAST(ntohl(ip->ip_src.s_addr)) ||
  325             IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
  326             IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)) ||
  327             IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) ||
  328             ip->ip_src.s_addr == INADDR_ANY ||
  329             ip->ip_dst.s_addr == INADDR_ANY )
  330                 return m;
  331 
  332         /*
  333          * Is it for a local address on this host?
  334          */
  335         if (in_localip(ip->ip_dst))
  336                 return m;
  337 
  338         IPSTAT_INC(ips_total);
  339 
  340         /*
  341          * Step 3: incoming packet firewall processing
  342          */
  343 
  344         odest.s_addr = dest.s_addr = ip->ip_dst.s_addr;
  345 
  346         /*
  347          * Run through list of ipfilter hooks for input packets
  348          */
  349         if (!PFIL_HOOKED(&V_inet_pfil_hook))
  350                 goto passin;
  351 
  352         if (pfil_run_hooks(
  353             &V_inet_pfil_hook, &m, m->m_pkthdr.rcvif, PFIL_IN, NULL) ||
  354             m == NULL)
  355                 goto drop;
  356 
  357         M_ASSERTVALID(m);
  358         M_ASSERTPKTHDR(m);
  359 
  360         ip = mtod(m, struct ip *);      /* m may have changed by pfil hook */
  361         dest.s_addr = ip->ip_dst.s_addr;
  362 
  363         /*
  364          * Destination address changed?
  365          */
  366         if (odest.s_addr != dest.s_addr) {
  367                 /*
  368                  * Is it now for a local address on this host?
  369                  */
  370                 if (in_localip(dest))
  371                         goto forwardlocal;
  372                 /*
  373                  * Go on with new destination address
  374                  */
  375         }
  376 
  377         if (m->m_flags & M_FASTFWD_OURS) {
  378                 /*
  379                  * ipfw changed it for a local address on this host.
  380                  */
  381                 goto forwardlocal;
  382         }
  383 
  384 passin:
  385         /*
  386          * Step 4: decrement TTL and look up route
  387          */
  388 
  389         /*
  390          * Check TTL
  391          */
  392 #ifdef IPSTEALTH
  393         if (!V_ipstealth) {
  394 #endif
  395         if (ip->ip_ttl <= IPTTLDEC) {
  396                 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0);
  397                 return NULL;    /* mbuf already free'd */
  398         }
  399 
  400         /*
  401          * Decrement the TTL and incrementally change the IP header checksum.
  402          * Don't bother doing this with hw checksum offloading, it's faster
  403          * doing it right here.
  404          */
  405         ip->ip_ttl -= IPTTLDEC;
  406         if (ip->ip_sum >= (u_int16_t) ~htons(IPTTLDEC << 8))
  407                 ip->ip_sum -= ~htons(IPTTLDEC << 8);
  408         else
  409                 ip->ip_sum += htons(IPTTLDEC << 8);
  410 #ifdef IPSTEALTH
  411         }
  412 #endif
  413 
  414         /*
  415          * Find route to destination.
  416          */
  417         if ((dst = ip_findroute(&ro, dest, m)) == NULL)
  418                 return NULL;    /* icmp unreach already sent */
  419         ifp = ro.ro_rt->rt_ifp;
  420 
  421         /*
  422          * Immediately drop blackholed traffic, and directed broadcasts
  423          * for either the all-ones or all-zero subnet addresses on
  424          * locally attached networks.
  425          */
  426         if ((ro.ro_rt->rt_flags & (RTF_BLACKHOLE|RTF_BROADCAST)) != 0)
  427                 goto drop;
  428 
  429         /*
  430          * Step 5: outgoing firewall packet processing
  431          */
  432 
  433         /*
  434          * Run through list of hooks for output packets.
  435          */
  436         if (!PFIL_HOOKED(&V_inet_pfil_hook))
  437                 goto passout;
  438 
  439         if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_OUT, NULL) || m == NULL) {
  440                 goto drop;
  441         }
  442 
  443         M_ASSERTVALID(m);
  444         M_ASSERTPKTHDR(m);
  445 
  446         ip = mtod(m, struct ip *);
  447         dest.s_addr = ip->ip_dst.s_addr;
  448 
  449         /*
  450          * Destination address changed?
  451          */
  452         if (m->m_flags & M_IP_NEXTHOP)
  453                 fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
  454         if (odest.s_addr != dest.s_addr || fwd_tag != NULL) {
  455                 /*
  456                  * Is it now for a local address on this host?
  457                  */
  458                 if (m->m_flags & M_FASTFWD_OURS || in_localip(dest)) {
  459 forwardlocal:
  460                         /*
  461                          * Return packet for processing by ip_input().
  462                          */
  463                         m->m_flags |= M_FASTFWD_OURS;
  464                         if (ro.ro_rt)
  465                                 RTFREE(ro.ro_rt);
  466                         return m;
  467                 }
  468                 /*
  469                  * Redo route lookup with new destination address
  470                  */
  471                 if (fwd_tag) {
  472                         dest.s_addr = ((struct sockaddr_in *)
  473                                     (fwd_tag + 1))->sin_addr.s_addr;
  474                         m_tag_delete(m, fwd_tag);
  475                         m->m_flags &= ~M_IP_NEXTHOP;
  476                 }
  477                 RTFREE(ro.ro_rt);
  478                 if ((dst = ip_findroute(&ro, dest, m)) == NULL)
  479                         return NULL;    /* icmp unreach already sent */
  480                 ifp = ro.ro_rt->rt_ifp;
  481         }
  482 
  483 passout:
  484         /*
  485          * Step 6: send off the packet
  486          */
  487         ip_len = ntohs(ip->ip_len);
  488         ip_off = ntohs(ip->ip_off);
  489 
  490         /*
  491          * Check if route is dampned (when ARP is unable to resolve)
  492          */
  493         if ((ro.ro_rt->rt_flags & RTF_REJECT) &&
  494             (ro.ro_rt->rt_expire == 0 || time_uptime < ro.ro_rt->rt_expire)) {
  495                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
  496                 goto consumed;
  497         }
  498 
  499 #ifndef ALTQ
  500         /*
  501          * Check if there is enough space in the interface queue
  502          */
  503         if ((ifp->if_snd.ifq_len + ip_len / ifp->if_mtu + 1) >=
  504             ifp->if_snd.ifq_maxlen) {
  505                 IPSTAT_INC(ips_odropped);
  506                 /* would send source quench here but that is depreciated */
  507                 goto drop;
  508         }
  509 #endif
  510 
  511         /*
  512          * Check if media link state of interface is not down
  513          */
  514         if (ifp->if_link_state == LINK_STATE_DOWN) {
  515                 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
  516                 goto consumed;
  517         }
  518 
  519         /*
  520          * Check if packet fits MTU or if hardware will fragment for us
  521          */
  522         if (ro.ro_rt->rt_mtu)
  523                 mtu = min(ro.ro_rt->rt_mtu, ifp->if_mtu);
  524         else
  525                 mtu = ifp->if_mtu;
  526 
  527         if (ip_len <= mtu ||
  528             (ifp->if_hwassist & CSUM_FRAGMENT && (ip_off & IP_DF) == 0)) {
  529                 /*
  530                  * Avoid confusing lower layers.
  531                  */
  532                 m_clrprotoflags(m);
  533                 /*
  534                  * Send off the packet via outgoing interface
  535                  */
  536                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
  537                 error = (*ifp->if_output)(ifp, m,
  538                                 (struct sockaddr *)dst, &ro);
  539         } else {
  540                 /*
  541                  * Handle EMSGSIZE with icmp reply needfrag for TCP MTU discovery
  542                  */
  543                 if (ip_off & IP_DF) {
  544                         IPSTAT_INC(ips_cantfrag);
  545                         icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
  546                                 0, mtu);
  547                         goto consumed;
  548                 } else {
  549                         /*
  550                          * We have to fragment the packet
  551                          */
  552                         m->m_pkthdr.csum_flags |= CSUM_IP;
  553                         if (ip_fragment(ip, &m, mtu, ifp->if_hwassist))
  554                                 goto drop;
  555                         KASSERT(m != NULL, ("null mbuf and no error"));
  556                         /*
  557                          * Send off the fragments via outgoing interface
  558                          */
  559                         error = 0;
  560                         do {
  561                                 m0 = m->m_nextpkt;
  562                                 m->m_nextpkt = NULL;
  563                                 /*
  564                                  * Avoid confusing lower layers.
  565                                  */
  566                                 m_clrprotoflags(m);
  567 
  568                                 IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
  569                                 error = (*ifp->if_output)(ifp, m,
  570                                         (struct sockaddr *)dst, &ro);
  571                                 if (error)
  572                                         break;
  573                         } while ((m = m0) != NULL);
  574                         if (error) {
  575                                 /* Reclaim remaining fragments */
  576                                 for (m = m0; m; m = m0) {
  577                                         m0 = m->m_nextpkt;
  578                                         m_freem(m);
  579                                 }
  580                         } else
  581                                 IPSTAT_INC(ips_fragmented);
  582                 }
  583         }
  584 
  585         if (error != 0)
  586                 IPSTAT_INC(ips_odropped);
  587         else {
  588                 counter_u64_add(ro.ro_rt->rt_pksent, 1);
  589                 IPSTAT_INC(ips_forward);
  590                 IPSTAT_INC(ips_fastforward);
  591         }
  592 consumed:
  593         RTFREE(ro.ro_rt);
  594         return NULL;
  595 drop:
  596         if (m)
  597                 m_freem(m);
  598         if (ro.ro_rt)
  599                 RTFREE(ro.ro_rt);
  600         return NULL;
  601 }

Cache object: ee3572d16936b5397ba3bb5fa16cab33


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