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

     /*      $NetBSD: in_proto.c,v 1.131 2022/09/03 02:53:18 thorpej 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  8.2 (Berkeley) 2/9/95
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: in_proto.c,v 1.131 2022/09/03 02:53:18 thorpej Exp $");
    
    #ifdef _KERNEL_OPT
    #include "opt_mrouting.h"
    #include "opt_inet.h"
    #include "opt_ipsec.h"
    #include "opt_pim.h"
    #include "opt_gateway.h"
    #include "opt_dccp.h"
    #include "opt_sctp.h"
    #include "opt_compat_netbsd.h"
    #include "opt_net_mpsafe.h"
    #endif
    
    #include <sys/param.h>
    #include <sys/socket.h>
    #include <sys/protosw.h>
    #include <sys/domain.h>
    #include <sys/mbuf.h>
    
    #include <net/if.h>
    
    #include <netinet/in.h>
    #include <netinet/in_systm.h>
    #include <netinet/in_var.h>
    #include <netinet/ip.h>
    #include <netinet/ip_var.h>
    #include <netinet/ip_icmp.h>
    #include <netinet/in_ifattach.h>
    #include <netinet/in_pcb.h>
    #include <netinet/in_proto.h>
    
    #ifdef INET6
    #ifndef INET
    #include <netinet/in.h>
    #endif
   #include <netinet/ip6.h>
   #endif
   
   #include <netinet/igmp_var.h>
   #ifdef PIM
   #include <netinet/pim_var.h>
   #endif
   #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/tcp_debug.h>
   #include <netinet/udp.h>
   #include <netinet/udp_var.h>
   #include <netinet/ip_encap.h>
   
   #ifdef DCCP
   #include <netinet/dccp.h>
   #include <netinet/dccp_var.h>
   #endif
   
   #ifdef SCTP
   #include <netinet/sctp.h>
   #include <netinet/sctp_var.h>
   #endif
   
   /*
    * TCP/IP protocol family: IP, ICMP, UDP, TCP.
    */
   
   #ifdef IPSEC
   #include <netipsec/ipsec.h>
   #include <netipsec/key.h>
   #endif  /* IPSEC */
   
   #include "carp.h"
   #if NCARP > 0
   #include <netinet/ip_carp.h>
   #endif
   
   #include "pfsync.h"
   #if NPFSYNC > 0
   #include <net/pfvar.h>
   #include <net/if_pfsync.h>
   #endif
   
   DOMAIN_DEFINE(inetdomain);      /* forward declare and add to link set */
   
   /* Wrappers to acquire kernel_lock. */
   
   PR_WRAP_CTLINPUT(rip_ctlinput)
   PR_WRAP_CTLINPUT(udp_ctlinput)
   PR_WRAP_CTLINPUT(tcp_ctlinput)
   
   #define rip_ctlinput    rip_ctlinput_wrapper
   #define udp_ctlinput    udp_ctlinput_wrapper
   #define tcp_ctlinput    tcp_ctlinput_wrapper
   
   PR_WRAP_CTLOUTPUT(rip_ctloutput)
   PR_WRAP_CTLOUTPUT(udp_ctloutput)
   PR_WRAP_CTLOUTPUT(tcp_ctloutput)
   
   #define rip_ctloutput   rip_ctloutput_wrapper
   #define udp_ctloutput   udp_ctloutput_wrapper
   #define tcp_ctloutput   tcp_ctloutput_wrapper
   
   #ifdef DCCP
   PR_WRAP_CTLINPUT(dccp_ctlinput)
   PR_WRAP_CTLOUTPUT(dccp_ctloutput)
   
   #define dccp_ctlinput   dccp_ctlinput_wrapper
   #define dccp_ctloutput  dccp_ctloutput_wrapper
   #endif
   
   #ifdef SCTP
   PR_WRAP_CTLINPUT(sctp_ctlinput)
   PR_WRAP_CTLOUTPUT(sctp_ctloutput)
   
   #define sctp_ctlinput   sctp_ctlinput_wrapper
   #define sctp_ctloutput  sctp_ctloutput_wrapper
   #endif
   
   #ifdef NET_MPSAFE
   PR_WRAP_INPUT(udp_input)
   PR_WRAP_INPUT(tcp_input)
   #ifdef DCCP
   PR_WRAP_INPUT(dccp_input)
   #endif
   #ifdef SCTP
   PR_WRAP_INPUT(sctp_input)
   #endif
   PR_WRAP_INPUT(rip_input)
   #if NPFSYNC > 0
   PR_WRAP_INPUT(pfsync_input)
   #endif
   PR_WRAP_INPUT(igmp_input)
   #ifdef PIM
   PR_WRAP_INPUT(pim_input)
   #endif
   
   #define udp_input               udp_input_wrapper
   #define tcp_input               tcp_input_wrapper
   #define dccp_input              dccp_input_wrapper
   #define sctp_input              sctp_input_wrapper
   #define rip_input               rip_input_wrapper
   #define pfsync_input            pfsync_input_wrapper
   #define igmp_input              igmp_input_wrapper
   #define pim_input               pim_input_wrapper
   #endif
   
   #if defined(IPSEC)
   
   #ifdef IPSEC_RUMPKERNEL
   /*
    * .pr_input = ipsec4_common_input won't be resolved on loading
    * the ipsec shared library. We need a wrapper anyway.
    */
   static void
   ipsec4_common_input_wrapper(struct mbuf *m, int off, int proto)
   {
   
           if (ipsec_enabled) {
                   ipsec4_common_input(m, off, proto);
           } else {
                   m_freem(m);
           }
   }
   #define ipsec4_common_input     ipsec4_common_input_wrapper
   
   /* The ctlinput functions may not be loaded */
   #define IPSEC_WRAP_CTLINPUT(name)                       \
   static void *                                           \
   name##_wrapper(int a, const struct sockaddr *b, void *c)\
   {                                                       \
           void *rv;                                       \
           KERNEL_LOCK(1, NULL);                           \
           if (ipsec_enabled)                              \
                   rv = name(a, b, c);                     \
           else                                            \
                   rv = NULL;                              \
           KERNEL_UNLOCK_ONE(NULL);                        \
           return rv;                                      \
   }
   IPSEC_WRAP_CTLINPUT(ah4_ctlinput)
   IPSEC_WRAP_CTLINPUT(esp4_ctlinput)
   
   #else /* !IPSEC_RUMPKERNEL */
   
   PR_WRAP_CTLINPUT(ah4_ctlinput)
   PR_WRAP_CTLINPUT(esp4_ctlinput)
   
   #endif /* !IPSEC_RUMPKERNEL */
   
   #define ah4_ctlinput    ah4_ctlinput_wrapper
   #define esp4_ctlinput   esp4_ctlinput_wrapper
   
   #endif /* IPSEC */
   
   const struct protosw inetsw[] = {
   {       .pr_domain = &inetdomain,
           .pr_init = ip_init,
           .pr_fasttimo = ip_fasttimo,
           .pr_slowtimo = ip_slowtimo,
           .pr_drain = ip_drainstub,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_ICMP,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = icmp_input,
           .pr_ctlinput = rip_ctlinput,
           .pr_ctloutput = rip_ctloutput,
           .pr_usrreqs = &rip_usrreqs,
           .pr_init = icmp_init,
   },
   {       .pr_type = SOCK_DGRAM,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_UDP,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
           .pr_input = udp_input,
           .pr_ctlinput = udp_ctlinput,
           .pr_ctloutput = udp_ctloutput,
           .pr_usrreqs = &udp_usrreqs,
           .pr_init = udp_init,
   },
   {       .pr_type = SOCK_STREAM,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_TCP,
           .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF,
           .pr_input = tcp_input,
           .pr_ctlinput = tcp_ctlinput,
           .pr_ctloutput = tcp_ctloutput,
           .pr_usrreqs = &tcp_usrreqs,
           .pr_init = tcp_init,
           .pr_fasttimo = tcp_fasttimo,
           .pr_drain = tcp_drainstub,
   },
   #ifdef DCCP
   {       .pr_type = SOCK_CONN_DGRAM,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_DCCP,
           .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_ATOMIC|PR_LISTEN|PR_ABRTACPTDIS,
           .pr_input = dccp_input,
           .pr_ctlinput = dccp_ctlinput,
           .pr_ctloutput = dccp_ctloutput,
           .pr_usrreqs = &dccp_usrreqs,
           .pr_init = dccp_init,
   },
   #endif
   #ifdef SCTP
   {       .pr_type = SOCK_DGRAM,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_SCTP,
           .pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
           .pr_input = sctp_input,
           .pr_ctlinput = sctp_ctlinput,
           .pr_ctloutput = sctp_ctloutput,
           .pr_usrreqs = &sctp_usrreqs,
           .pr_init = sctp_init,
           .pr_drain = sctp_drain
   },
   {       .pr_type = SOCK_SEQPACKET,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_SCTP,
           .pr_flags = PR_ADDR_OPT|PR_WANTRCVD,
           .pr_input = sctp_input,
           .pr_ctlinput = sctp_ctlinput,
           .pr_ctloutput = sctp_ctloutput,
           .pr_usrreqs = &sctp_usrreqs,
           .pr_drain = sctp_drain
   },
   {       .pr_type = SOCK_STREAM,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_SCTP,
           .pr_flags = PR_CONNREQUIRED|PR_ADDR_OPT|PR_WANTRCVD|PR_LISTEN,
           .pr_input = sctp_input,
           .pr_ctlinput = sctp_ctlinput,
           .pr_ctloutput = sctp_ctloutput,
           .pr_usrreqs = &sctp_usrreqs,
           .pr_drain = sctp_drain
   },
   #endif /* SCTP */
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_RAW,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
           .pr_input = rip_input,
           .pr_ctlinput = rip_ctlinput,
           .pr_ctloutput = rip_ctloutput,
           .pr_usrreqs = &rip_usrreqs,
   },
   #ifdef GATEWAY
   {       .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_IP,
           .pr_slowtimo = ipflow_slowtimo,
           .pr_init = ipflow_poolinit,
   },
   #endif /* GATEWAY */
   #ifdef IPSEC
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_AH,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ipsec4_common_input,
           .pr_ctlinput = ah4_ctlinput,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_ESP,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ipsec4_common_input,
           .pr_ctlinput = esp4_ctlinput,
   },
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_IPCOMP,
           .pr_flags = PR_ATOMIC|PR_ADDR,
           .pr_input = ipsec4_common_input,
   },
   #endif /* IPSEC */
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_IPV4,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = encap4_input,
           .pr_ctlinput = rip_ctlinput,
           .pr_ctloutput = rip_ctloutput,
           .pr_usrreqs = &rip_usrreqs,
           .pr_init = encap_init,
   },
   #ifdef INET6
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_IPV6,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = encap4_input,
           .pr_ctlinput = rip_ctlinput,
           .pr_ctloutput = rip_ctloutput,
           .pr_usrreqs = &rip_usrreqs,
           .pr_init = encap_init,
   },
   #endif /* INET6 */
   #if NCARP > 0
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_CARP,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = carp_proto_input,
           .pr_ctloutput = rip_ctloutput,
           .pr_usrreqs = &rip_usrreqs,
           .pr_init = carp_init,
   },
   #endif /* NCARP > 0 */
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_L2TP,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = encap4_input,
           .pr_ctlinput = rip_ctlinput,
           .pr_ctloutput = rip_ctloutput,
           .pr_usrreqs = &rip_usrreqs,     /*XXX*/
           .pr_init = encap_init,
   },
   #if NPFSYNC > 0
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_PFSYNC,
           .pr_flags        = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input        = pfsync_input,
           .pr_ctloutput = rip_ctloutput,
           .pr_usrreqs      = &rip_usrreqs,
   },
   #endif /* NPFSYNC > 0 */
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_IGMP,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = igmp_input, 
           .pr_ctloutput = rip_ctloutput,
           .pr_ctlinput = rip_ctlinput,
           .pr_usrreqs = &rip_usrreqs,
           .pr_fasttimo = igmp_fasttimo,
           .pr_slowtimo = igmp_slowtimo,
           .pr_init = igmp_init,
   },
   #ifdef PIM
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_protocol = IPPROTO_PIM,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = pim_input, 
           .pr_ctloutput = rip_ctloutput,
           .pr_ctlinput = rip_ctlinput,
           .pr_usrreqs = &rip_usrreqs,
   },
   #endif /* PIM */
   /* raw wildcard */
   {       .pr_type = SOCK_RAW,
           .pr_domain = &inetdomain,
           .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
           .pr_input = rip_input, 
           .pr_ctloutput = rip_ctloutput,
           .pr_ctlinput = rip_ctlinput,
           .pr_usrreqs = &rip_usrreqs,
           .pr_init = rip_init,
   },
   };
   
   const struct sockaddr_in in_any = {
             .sin_len = sizeof(struct sockaddr_in)
           , .sin_family = AF_INET
           , .sin_port = 0
           , .sin_addr = {.s_addr = 0 /* INADDR_ANY */}
   };
   
   struct domain inetdomain = {
           .dom_family = PF_INET, .dom_name = "internet", .dom_init = NULL,
           .dom_externalize = NULL, .dom_dispose = NULL,
           .dom_protosw = inetsw,
           .dom_protoswNPROTOSW = &inetsw[__arraycount(inetsw)],
           .dom_rtattach = rt_inithead,
           .dom_rtoffset = 32,
           .dom_maxrtkey = sizeof(struct ip_pack4),
           .dom_if_up = in_if_up,
           .dom_if_down = in_if_down,
           .dom_ifattach = in_domifattach,
           .dom_ifdetach = in_domifdetach,
           .dom_if_link_state_change = in_if_link_state_change,
           .dom_link = { NULL },
           .dom_mowner = MOWNER_INIT("",""),
           .dom_sa_cmpofs = offsetof(struct sockaddr_in, sin_addr),
           .dom_sa_cmplen = sizeof(struct in_addr),
           .dom_sa_any = (const struct sockaddr *)&in_any,
           .dom_sockaddr_const_addr = sockaddr_in_const_addr,
           .dom_sockaddr_addr = sockaddr_in_addr,
   };
   
   u_char  ip_protox[IPPROTO_MAX];
   
   static void
   sockaddr_in_addrlen(const struct sockaddr *sa, socklen_t *slenp)
   {
           socklen_t slen;
   
           if (slenp == NULL)
                   return;
   
           slen = sockaddr_getlen(sa);
           *slenp = (socklen_t)MIN(sizeof(struct in_addr),
               slen - MIN(slen, offsetof(struct sockaddr_in, sin_addr)));
   }
   
   const void *
   sockaddr_in_const_addr(const struct sockaddr *sa, socklen_t *slenp)
   {
           const struct sockaddr_in *sin;
   
           sockaddr_in_addrlen(sa, slenp);
           sin = (const struct sockaddr_in *)sa;
           return &sin->sin_addr;
   }
   
   void *
   sockaddr_in_addr(struct sockaddr *sa, socklen_t *slenp)
   {
           struct sockaddr_in *sin;
   
           sockaddr_in_addrlen(sa, slenp);
           sin = (struct sockaddr_in *)sa;
           return &sin->sin_addr;
   }
   
   int
   sockaddr_in_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
   {
           uint_fast8_t len;
           const uint_fast8_t addrofs = offsetof(struct sockaddr_in, sin_addr),
                              addrend = addrofs + sizeof(struct in_addr);
           int rc;
           const struct sockaddr_in *sin1, *sin2;
   
           sin1 = satocsin(sa1);
           sin2 = satocsin(sa2);
   
           len = MIN(addrend, MIN(sin1->sin_len, sin2->sin_len));
   
           if (len > addrofs &&
                (rc = memcmp(&sin1->sin_addr, &sin2->sin_addr,
                             len - addrofs)) != 0)
                   return rc;
   
           return sin1->sin_len - sin2->sin_len;
   }

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