FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_proto.c

     /*      $NetBSD: in6_proto.c,v 1.82.12.1 2010/11/21 20:45:39 riz Exp $  */
     /*      $KAME: in6_proto.c,v 1.66 2000/10/10 15:35:47 itojun Exp $      */
     
     /*
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
     */
    
    /*
     * Copyright (c) 1982, 1986, 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. 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.
     *
     *      @(#)in_proto.c  8.1 (Berkeley) 6/10/93
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: in6_proto.c,v 1.82.12.1 2010/11/21 20:45:39 riz Exp $");
    
    #include "opt_inet.h"
    #include "opt_ipsec.h"
    #include "opt_iso.h"
    
    #include <sys/param.h>
    #include <sys/socket.h>
    #include <sys/protosw.h>
    #include <sys/kernel.h>
    #include <sys/domain.h>
    #include <sys/mbuf.h>
    
    #include <net/if.h>
    #include <net/radix.h>
    #include <net/route.h>
    
    #include <netinet/in.h>
    #include <netinet/in_systm.h>
    #include <netinet/in_var.h>
    #include <netinet/ip_encap.h>
    #include <netinet/ip.h>
    #include <netinet/ip_var.h>
    #include <netinet/in_pcb.h>
    #include <netinet/ip6.h>
    #include <netinet6/ip6_var.h>
    #include <netinet/icmp6.h>
    #include <netinet6/in6_pcb.h>
    
    #include <netinet/tcp.h>
    #include <netinet/tcp_fsm.h>
    #include <netinet/tcp_seq.h>
    #include <netinet/tcp_timer.h>
    #include <netinet/tcp_var.h>
    #include <netinet/tcpip.h>
   #include <netinet/tcp_debug.h>
   
   #include <netinet6/udp6.h>
   #include <netinet6/udp6_var.h>
   
   #include <netinet6/pim6_var.h>
   
   #include <netinet6/nd6.h>
   
   #ifdef IPSEC
   #include <netinet6/ipsec.h>
   #include <netinet6/ah.h>
   #ifdef IPSEC_ESP
   #include <netinet6/esp.h>
   #endif
   #include <netinet6/ipcomp.h>
   #endif /* IPSEC */
   
   #ifdef FAST_IPSEC
   #include <netipsec/ipsec.h>
   #include <netipsec/ipsec6.h>
   #include <netipsec/key.h>
   #endif /* FAST_IPSEC */
   
   
   #include "carp.h"
   #if NCARP > 0
   #include <netinet/ip_carp.h>
   #endif
   
   #include "etherip.h"
   #if NETHERIP > 0
   #include <netinet6/ip6_etherip.h>
   #endif
   
   #include <netinet6/ip6protosw.h>
   
   #include <net/net_osdep.h>
   
   #ifndef offsetof                /* XXX */
   #define offsetof(type, member)  ((size_t)(&((type *)0)->member))
   #endif
   
   /*
    * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
    */
   
   DOMAIN_DEFINE(inet6domain);     /* forward declare and add to link set */
   
   /* Wrappers to acquire kernel_lock. */
   
   PR_WRAP_USRREQ(rip6_usrreq)
   PR_WRAP_USRREQ(udp6_usrreq)
   PR_WRAP_USRREQ(tcp_usrreq)
   
   #define rip6_usrreq     rip6_usrreq_wrapper
   #define udp6_usrreq     udp6_usrreq_wrapper
   #define tcp_usrreq      tcp_usrreq_wrapper
   
   PR_WRAP_CTLINPUT(rip6_ctlinput)
   PR_WRAP_CTLINPUT(encap6_ctlinput)
   PR_WRAP_CTLINPUT(udp6_ctlinput)
   PR_WRAP_CTLINPUT(tcp6_ctlinput)
   
   #define rip6_ctlinput   rip6_ctlinput_wrapper
   #define encap6_ctlinput encap6_ctlinput_wrapper
   #define udp6_ctlinput   udp6_ctlinput_wrapper
   #define tcp6_ctlinput   tcp6_ctlinput_wrapper
   
   PR_WRAP_CTLOUTPUT(rip6_ctloutput)
   PR_WRAP_CTLOUTPUT(ip6_ctloutput)
   PR_WRAP_CTLOUTPUT(tcp_ctloutput)
   PR_WRAP_CTLOUTPUT(icmp6_ctloutput)
   
   #define rip6_ctloutput  rip6_ctloutput_wrapper
   #define ip6_ctloutput   ip6_ctloutput_wrapper
   #define tcp_ctloutput   tcp_ctloutput_wrapper
   #define icmp6_ctloutput icmp6_ctloutput_wrapper
   
   #if defined(IPSEC) || defined(FAST_IPSEC)
   PR_WRAP_CTLINPUT(ah6_ctlinput)
   PR_WRAP_CTLINPUT(esp6_ctlinput)
   
   #define ah6_ctlinput    ah6_ctlinput_wrapper
   #define esp6_ctlinput   esp6_ctlinput_wrapper
   #endif
   
   const struct ip6protosw inet6sw[] = {
   {       .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_IPV6,
           .pr_init = ip6_init,
           .pr_slowtimo = frag6_slowtimo,
           .pr_drain = frag6_drain,
   },
   {       .pr_type = SOCK_DGRAM,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_UDP,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
           .pr_input = udp6_input,
           .pr_ctlinput = udp6_ctlinput,
           .pr_ctloutput = ip6_ctloutput,
           .pr_usrreq = udp6_usrreq,
           .pr_init = udp6_init,
   },
   {       .pr_type = SOCK_STREAM,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_TCP,
           .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF,
           .pr_input = tcp6_input,
           .pr_ctlinput = tcp6_ctlinput,
           .pr_ctloutput = tcp_ctloutput,
           .pr_usrreq = tcp_usrreq,
   #ifndef INET    /* don't call initialization and timeout routines twice */
           .pr_init = tcp_init,
           .pr_slowtimo = tcp_slowtimo,
           .pr_drain = tcp_drain,
   #endif
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_RAW,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
           .pr_input = rip6_input,
           .pr_output = rip6_output,
           .pr_ctlinput = rip6_ctlinput,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
   },
   #ifdef GATEWAY
   {       .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_IPV6,
           .pr_slowtimo = ip6flow_slowtimo,
   },
   #endif /* GATEWAY */
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_ICMPV6,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = icmp6_input,
           .pr_output = rip6_output,
           .pr_ctlinput = rip6_ctlinput,
           .pr_ctloutput = icmp6_ctloutput,
           .pr_usrreq = rip6_usrreq,
           .pr_init = icmp6_init,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_DSTOPTS,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = dest6_input,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_ROUTING,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = route6_input,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_FRAGMENT,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = frag6_input,
   },
   #ifdef IPSEC
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_AH,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ah6_input,
           .pr_ctlinput = ah6_ctlinput,
           .pr_init = ah6_init,
   },
   #ifdef IPSEC_ESP
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_ESP,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = esp6_input,
           .pr_ctlinput = esp6_ctlinput,
           .pr_init = esp6_init,
   },
   #endif
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_IPCOMP,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ipcomp6_input,
           .pr_init = ipcomp6_init,
   },
   #endif /* IPSEC */
   #ifdef FAST_IPSEC
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_AH,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ipsec6_common_input,
           .pr_ctlinput = ah6_ctlinput,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_ESP,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ipsec6_common_input,
           .pr_ctlinput = esp6_ctlinput,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_IPCOMP,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ipsec6_common_input,
   },
   #endif /* FAST_IPSEC */
   #ifdef INET
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_IPV4,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = encap6_input,
           .pr_output = rip6_output,
           .pr_ctlinput = encap6_ctlinput,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
           .pr_init = encap_init,
   },
   #endif
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_IPV6,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = encap6_input,
           .pr_output = rip6_output,
           .pr_ctlinput = encap6_ctlinput,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
           .pr_init = encap_init,
   },
   #if NETHERIP > 0
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_ETHERIP,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = ip6_etherip_input,
           .pr_output = rip6_output,
           .pr_ctlinput = rip6_ctlinput,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
   },
   #endif
   #if NCARP > 0
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_CARP,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = carp6_proto_input,
           .pr_output = rip6_output,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
   },
   #endif /* NCARP */
   #ifdef ISO
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_EON,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = encap6_input,
           .pr_output = rip6_output,
           .pr_ctlinput = encap6_ctlinput,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
           /*XXX*/
           .pr_init = encap_init,
   },
   #endif
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_protocol = IPPROTO_PIM,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = pim6_input,
           .pr_output = rip6_output,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
           .pr_init = pim6_init,
   },
   /* raw wildcard */
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inet6domain,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = rip6_input,
           .pr_output = rip6_output,
           .pr_ctloutput = rip6_ctloutput,
           .pr_usrreq = rip6_usrreq,
           .pr_init = rip6_init,
   },
   };
   
   static const struct sockaddr_in6 in6_any = {
             .sin6_len = sizeof(in6_any)
           , .sin6_family = AF_INET6
           , .sin6_port = 0
           , .sin6_flowinfo = 0
           , .sin6_addr = IN6ADDR_ANY_INIT
           , .sin6_scope_id = 0
   };
   
   struct domain inet6domain = {
           .dom_family = AF_INET6, .dom_name = "internet6",
           .dom_init = NULL, .dom_externalize = NULL, .dom_dispose = NULL,
           .dom_protosw = (const struct protosw *)inet6sw,
           .dom_protoswNPROTOSW = (const struct protosw *)&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])],
           .dom_rtattach = rn_inithead,
           .dom_rtoffset = offsetof(struct sockaddr_in6, sin6_addr) << 3,
           .dom_maxrtkey = sizeof(struct sockaddr_in6),
           .dom_ifattach = in6_domifattach, .dom_ifdetach = in6_domifdetach,
           .dom_ifqueues = { &ip6intrq, NULL },
           .dom_link = { NULL },
           .dom_mowner = MOWNER_INIT("",""),
           .dom_sa_cmpofs = offsetof(struct sockaddr_in6, sin6_addr),
           .dom_sa_cmplen = sizeof(struct in6_addr),
           .dom_sa_any = (const struct sockaddr *)&in6_any,
           .dom_rtcache = LIST_HEAD_INITIALIZER(inet6domain.dom_rtcache)
   };
   
   int
   sockaddr_in6_cmp(const struct sockaddr *lsa, const struct sockaddr *rsa)
   {
           uint_fast8_t len;
           const uint_fast8_t addrofs = offsetof(struct sockaddr_in6, sin6_addr),
                              addrend = addrofs + sizeof(struct in6_addr);
           int rc;
           const struct sockaddr_in6 *lsin6, *rsin6;
   
           lsin6 = satocsin6(lsa);
           rsin6 = satocsin6(rsa);
   
           len = MIN(addrend, MIN(lsin6->sin6_len, rsin6->sin6_len));
   
           if (len > addrofs &&
               (rc = memcmp(&lsin6->sin6_addr, &rsin6->sin6_addr,
                             len - addrofs)) != 0)
                   return rc;
   
           return lsin6->sin6_len - rsin6->sin6_len;
   }
   
   /*
    * Internet configuration info
    */
   #ifndef IPV6FORWARDING
   #ifdef GATEWAY6
   #define IPV6FORWARDING  1       /* forward IP6 packets not for us */
   #else
   #define IPV6FORWARDING  0       /* don't forward IP6 packets not for us */
   #endif /* GATEWAY6 */
   #endif /* !IPV6FORWARDING */
   
   int     ip6_forwarding = IPV6FORWARDING;        /* act as router? */
   int     ip6_sendredirects = 1;
   int     ip6_defhlim = IPV6_DEFHLIM;
   int     ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
   int     ip6_accept_rtadv = 0;   /* "IPV6FORWARDING ? 0 : 1" is dangerous */
   int     ip6_maxfragpackets = 200;
   int     ip6_maxfrags = 200;
   int     ip6_log_interval = 5;
   int     ip6_hdrnestlimit = 50;  /* appropriate? */
   int     ip6_dad_count = 1;      /* DupAddrDetectionTransmits */
   int     ip6_auto_flowlabel = 1;
   int     ip6_use_deprecated = 1; /* allow deprecated addr (RFC2462 5.5.4) */
   int     ip6_rr_prune = 5;       /* router renumbering prefix
                                    * walk list every 5 sec. */
   int     ip6_mcast_pmtu = 0;     /* enable pMTU discovery for multicast? */
   int     ip6_v6only = 1;
   
   int     ip6_keepfaith = 0;
   time_t  ip6_log_time = (time_t)0L;
   
   /* icmp6 */
   /*
    * BSDI4 defines these variables in in_proto.c...
    * XXX: what if we don't define INET? Should we define pmtu6_expire
    * or so? (jinmei@kame.net 19990310)
    */
   int pmtu_expire = 60*10;
   
   /* raw IP6 parameters */
   /*
    * Nominal space allocated to a raw ip socket.
    */
   #define RIPV6SNDQ       8192
   #define RIPV6RCVQ       8192
   
   u_long  rip6_sendspace = RIPV6SNDQ;
   u_long  rip6_recvspace = RIPV6RCVQ;
   
   /* ICMPV6 parameters */
   int     icmp6_rediraccept = 1;          /* accept and process redirects */
   int     icmp6_redirtimeout = 10 * 60;   /* 10 minutes */
   int     icmp6errppslim = 100;           /* 100pps */
   int     icmp6_nodeinfo = 1;             /* enable/disable NI response */
   
   /* UDP on IP6 parameters */
   int     udp6_sendspace = 9216;          /* really max datagram size */
   int     udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
                                           /* 40 1K datagrams */

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