in_proto.c

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/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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>
__FBSDID("$FreeBSD$");
 
#include "opt_mrouting.h"
#include "opt_ipsec.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_sctp.h"
 
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/domain.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
 
/*
 * While this file provides the domain and protocol switch tables for IPv4, it
 * also provides the sysctl node declarations for net.inet.* often shared with
 * IPv6 for common features or by upper layer protocols.  In case of no IPv4
 * support compile out everything but these sysctl nodes.
 */
#ifdef INET
#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>
#include <net/vnet.h>
#endif /* INET */
 
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#endif
 
#ifdef INET
#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/igmp_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip_encap.h>
 
/*
 * TCP/IP protocol family: IP, ICMP, UDP, TCP.
 */
 
static struct pr_usrreqs nousrreqs;
 
#ifdef SCTP
#include <netinet/in_pcb.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp.h>
#include <netinet/sctp_var.h>
#endif
 
FEATURE(inet, "Internet Protocol version 4");
 
extern  struct domain inetdomain;
 
/* Spacer for loadable protocols. */
#define IPPROTOSPACER                           \
{                                               \
        .pr_domain =            &inetdomain,    \
        .pr_protocol =          PROTO_SPACER,   \
        .pr_usrreqs =           &nousrreqs      \
}
 
struct protosw inetsw[] = {
{
        .pr_type =              0,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_IP,
        .pr_flags =             PR_CAPATTACH,
        .pr_slowtimo =          ip_slowtimo,
        .pr_drain =             ip_drain,
        .pr_usrreqs =           &nousrreqs
},
{
        .pr_type =              SOCK_DGRAM,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_UDP,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_CAPATTACH,
        .pr_input =             udp_input,
        .pr_ctlinput =          udp_ctlinput,
        .pr_ctloutput =         udp_ctloutput,
        .pr_usrreqs =           &udp_usrreqs
},
{
        .pr_type =              SOCK_STREAM,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_TCP,
        .pr_flags =             PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD|
                                    PR_CAPATTACH,
        .pr_input =             tcp_input,
        .pr_ctlinput =          tcp_ctlinput,
        .pr_ctloutput =         tcp_ctloutput,
        .pr_slowtimo =          tcp_slowtimo,
        .pr_drain =             tcp_drain,
        .pr_usrreqs =           &tcp_usrreqs
},
#ifdef SCTP
{
        .pr_type =              SOCK_SEQPACKET,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_SCTP,
        .pr_flags =             PR_WANTRCVD|PR_LASTHDR,
        .pr_input =             sctp_input,
        .pr_ctlinput =          sctp_ctlinput,
        .pr_ctloutput =         sctp_ctloutput,
        .pr_drain =             sctp_drain,
        .pr_usrreqs =           &sctp_usrreqs
},
{
        .pr_type =              SOCK_STREAM,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_SCTP,
        .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_LASTHDR,
        .pr_input =             sctp_input,
        .pr_ctlinput =          sctp_ctlinput,
        .pr_ctloutput =         sctp_ctloutput,
        .pr_drain =             NULL, /* Covered by the SOCK_SEQPACKET entry. */
        .pr_usrreqs =           &sctp_usrreqs
},
#endif /* SCTP */
{
        .pr_type =              SOCK_DGRAM,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_UDPLITE,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_CAPATTACH,
        .pr_input =             udp_input,
        .pr_ctlinput =          udplite_ctlinput,
        .pr_ctloutput =         udp_ctloutput,
        .pr_usrreqs =           &udp_usrreqs
},
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_RAW,
        .pr_flags =             PR_ATOMIC|PR_ADDR,
        .pr_input =             rip_input,
        .pr_ctlinput =          rip_ctlinput,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_ICMP,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
        .pr_input =             icmp_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
{
        .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_fasttimo =          igmp_fasttimo,
        .pr_slowtimo =          igmp_slowtimo,
        .pr_usrreqs =           &rip_usrreqs
},
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_RSVP,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
        .pr_input =             rsvp_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_IPV4,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
        .pr_input =             encap4_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_MOBILE,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
        .pr_input =             encap4_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_ETHERIP,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
        .pr_input =             encap4_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_GRE,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
        .pr_input =             encap4_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
# 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_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
#endif
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_PIM,
        .pr_flags =             PR_ATOMIC|PR_ADDR|PR_LASTHDR,
        .pr_input =             encap4_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
/* Spacer n-times for loadable protocols. */
IPPROTOSPACER,
IPPROTOSPACER,
IPPROTOSPACER,
IPPROTOSPACER,
IPPROTOSPACER,
IPPROTOSPACER,
IPPROTOSPACER,
IPPROTOSPACER,
/* raw wildcard */
{
        .pr_type =              SOCK_RAW,
        .pr_domain =            &inetdomain,
        .pr_flags =             PR_ATOMIC|PR_ADDR,
        .pr_input =             rip_input,
        .pr_ctloutput =         rip_ctloutput,
        .pr_usrreqs =           &rip_usrreqs
},
};
 
struct domain inetdomain = {
        .dom_family =           AF_INET,
        .dom_name =             "internet",
        .dom_protosw =          inetsw,
        .dom_protoswNPROTOSW =  &inetsw[nitems(inetsw)],
        .dom_rtattach =         in_inithead,
#ifdef VIMAGE
        .dom_rtdetach =         in_detachhead,
#endif
        .dom_ifattach =         in_domifattach,
        .dom_ifdetach =         in_domifdetach
};
 
DOMAIN_SET(inet);
#endif /* INET */
 
SYSCTL_NODE(_net, PF_INET, inet, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "Internet Family");
 
SYSCTL_NODE(_net_inet, IPPROTO_IP, ip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "IP");
SYSCTL_NODE(_net_inet, IPPROTO_ICMP, icmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "ICMP");
SYSCTL_NODE(_net_inet, IPPROTO_UDP, udp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "UDP");
SYSCTL_NODE(_net_inet, IPPROTO_TCP, tcp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "TCP");
#if defined(SCTP) || defined(SCTP_SUPPORT)
SYSCTL_NODE(_net_inet, IPPROTO_SCTP, sctp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "SCTP");
#endif
SYSCTL_NODE(_net_inet, IPPROTO_IGMP, igmp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "IGMP");
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
/* XXX no protocol # to use, pick something "reserved" */
SYSCTL_NODE(_net_inet, 253, ipsec, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "IPSEC");
SYSCTL_NODE(_net_inet, IPPROTO_AH, ah, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "AH");
SYSCTL_NODE(_net_inet, IPPROTO_ESP, esp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "ESP");
SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP, ipcomp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "IPCOMP");
SYSCTL_NODE(_net_inet, IPPROTO_IPIP, ipip, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "IPIP");
#endif /* IPSEC */
SYSCTL_NODE(_net_inet, IPPROTO_RAW, raw, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "RAW");
SYSCTL_NODE(_net_inet, OID_AUTO, accf, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "Accept filters");