The inpcb structure has inp_sp pointer that is initialized by ipsec_init_pcbpolicy() function. This pointer keeps strorage for IPsec security policies associated with a specific socket. An application can use IP_IPSEC_POLICY and IPV6_IPSEC_POLICY socket options to configure these security policies. Then ip[6]_output() uses inpcb pointer to specify that an outgoing packet is associated with some socket. And IPSEC_OUTPUT() method can use a security policy stored in the inp_sp. For inbound packet the protocol-specific input routine uses IPSEC_CHECK_POLICY() method to check that a packet conforms to inbound security policy configured in the inpcb. SCTP protocol doesn't specify inpcb for ip[6]_output() when it sends packets. Thus IPSEC_OUTPUT() method does not consider such packets as associated with some socket and can not apply security policies from inpcb, even if they are configured. Since IPSEC_CHECK_POLICY() method is called from protocol-specific input routine, it can specify inpcb pointer and associated with socket inbound policy will be checked. But there are two problems: 1. Such check is asymmetric, becasue we can not apply security policy from inpcb for outgoing packet. 2. IPSEC_CHECK_POLICY() expects that caller holds INPCB lock and access to inp_sp is protected. But for SCTP this is not correct, becasue SCTP uses own locks to protect inpcb. To fix these problems remove IPsec related PCB code from SCTP. This imply that IP_IPSEC_POLICY and IPV6_IPSEC_POLICY socket options will be not applicable to SCTP sockets. To be able correctly check inbound security policies for SCTP, mark its protocol header with the PR_LASTHDR flag. Reported by: tuexen Reviewed by: tuexen Differential Revision: https://reviews.freebsd.org/D9538
348 lines
9.3 KiB
C
348 lines
9.3 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)in_proto.c 8.2 (Berkeley) 2/9/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mrouting.h"
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#include "opt_ipsec.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_sctp.h"
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#include "opt_mpath.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/domain.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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/*
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* While this file provides the domain and protocol switch tables for IPv4, it
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* also provides the sysctl node declarations for net.inet.* often shared with
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* IPv6 for common features or by upper layer protocols. In case of no IPv4
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* support compile out everything but these sysctl nodes.
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*/
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#ifdef INET
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/route.h>
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#ifdef RADIX_MPATH
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#include <net/radix_mpath.h>
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#endif
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#include <net/vnet.h>
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#endif /* INET */
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#if defined(INET) || defined(INET6)
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#include <netinet/in.h>
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#endif
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#ifdef INET
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/igmp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/ip_encap.h>
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/*
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* TCP/IP protocol family: IP, ICMP, UDP, TCP.
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*/
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static struct pr_usrreqs nousrreqs;
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#ifdef SCTP
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#include <netinet/in_pcb.h>
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#include <netinet/sctp_pcb.h>
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#include <netinet/sctp.h>
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#include <netinet/sctp_var.h>
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#endif /* SCTP */
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FEATURE(inet, "Internet Protocol version 4");
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extern struct domain inetdomain;
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/* Spacer for loadable protocols. */
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#define IPPROTOSPACER \
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{ \
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.pr_domain = &inetdomain, \
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.pr_protocol = PROTO_SPACER, \
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.pr_usrreqs = &nousrreqs \
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}
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struct protosw inetsw[] = {
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{
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.pr_type = 0,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_IP,
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.pr_init = ip_init,
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.pr_slowtimo = ip_slowtimo,
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.pr_drain = ip_drain,
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.pr_usrreqs = &nousrreqs
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},
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{
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.pr_type = SOCK_DGRAM,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_UDP,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = udp_input,
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.pr_ctlinput = udp_ctlinput,
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.pr_ctloutput = udp_ctloutput,
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.pr_init = udp_init,
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.pr_usrreqs = &udp_usrreqs
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},
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{
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.pr_type = SOCK_STREAM,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_TCP,
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.pr_flags = PR_CONNREQUIRED|PR_IMPLOPCL|PR_WANTRCVD,
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.pr_input = tcp_input,
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.pr_ctlinput = tcp_ctlinput,
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.pr_ctloutput = tcp_ctloutput,
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.pr_init = tcp_init,
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.pr_slowtimo = tcp_slowtimo,
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.pr_drain = tcp_drain,
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.pr_usrreqs = &tcp_usrreqs
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},
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#ifdef SCTP
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{
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.pr_type = SOCK_SEQPACKET,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_SCTP,
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.pr_flags = PR_WANTRCVD|PR_LASTHDR,
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.pr_input = sctp_input,
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.pr_ctlinput = sctp_ctlinput,
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.pr_ctloutput = sctp_ctloutput,
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.pr_init = sctp_init,
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.pr_drain = sctp_drain,
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.pr_usrreqs = &sctp_usrreqs
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},
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{
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.pr_type = SOCK_STREAM,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_SCTP,
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.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LASTHDR,
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.pr_input = sctp_input,
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.pr_ctlinput = sctp_ctlinput,
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.pr_ctloutput = sctp_ctloutput,
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.pr_drain = sctp_drain,
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.pr_usrreqs = &sctp_usrreqs
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},
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#endif /* SCTP */
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{
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.pr_type = SOCK_DGRAM,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_UDPLITE,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = udp_input,
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.pr_ctlinput = udplite_ctlinput,
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.pr_ctloutput = udp_ctloutput,
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.pr_init = udplite_init,
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.pr_usrreqs = &udp_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_RAW,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = rip_input,
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.pr_ctlinput = rip_ctlinput,
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.pr_ctloutput = rip_ctloutput,
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.pr_usrreqs = &rip_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_ICMP,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = icmp_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_usrreqs = &rip_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_IGMP,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = igmp_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_fasttimo = igmp_fasttimo,
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.pr_slowtimo = igmp_slowtimo,
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.pr_usrreqs = &rip_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_RSVP,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = rsvp_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_usrreqs = &rip_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_IPV4,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap4_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_init = encap_init,
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.pr_usrreqs = &rip_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_MOBILE,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap4_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_init = encap_init,
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.pr_usrreqs = &rip_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_ETHERIP,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap4_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_init = encap_init,
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.pr_usrreqs = &rip_usrreqs
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},
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_GRE,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap4_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_init = encap_init,
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.pr_usrreqs = &rip_usrreqs
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},
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# ifdef INET6
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_IPV6,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap4_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_init = encap_init,
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.pr_usrreqs = &rip_usrreqs
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},
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#endif
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_protocol = IPPROTO_PIM,
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.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
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.pr_input = encap4_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_usrreqs = &rip_usrreqs
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},
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/* Spacer n-times for loadable protocols. */
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IPPROTOSPACER,
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IPPROTOSPACER,
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IPPROTOSPACER,
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IPPROTOSPACER,
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IPPROTOSPACER,
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IPPROTOSPACER,
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IPPROTOSPACER,
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IPPROTOSPACER,
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/* raw wildcard */
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{
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.pr_type = SOCK_RAW,
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.pr_domain = &inetdomain,
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = rip_input,
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.pr_ctloutput = rip_ctloutput,
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.pr_init = rip_init,
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.pr_usrreqs = &rip_usrreqs
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},
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};
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extern int in_inithead(void **, int);
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extern int in_detachhead(void **, int);
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struct domain inetdomain = {
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.dom_family = AF_INET,
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.dom_name = "internet",
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.dom_protosw = inetsw,
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.dom_protoswNPROTOSW = &inetsw[nitems(inetsw)],
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#ifdef RADIX_MPATH
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.dom_rtattach = rn4_mpath_inithead,
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#else
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.dom_rtattach = in_inithead,
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#endif
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#ifdef VIMAGE
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.dom_rtdetach = in_detachhead,
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#endif
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.dom_ifattach = in_domifattach,
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.dom_ifdetach = in_domifdetach
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};
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VNET_DOMAIN_SET(inet);
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#endif /* INET */
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SYSCTL_NODE(_net, PF_INET, inet, CTLFLAG_RW, 0,
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"Internet Family");
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SYSCTL_NODE(_net_inet, IPPROTO_IP, ip, CTLFLAG_RW, 0, "IP");
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SYSCTL_NODE(_net_inet, IPPROTO_ICMP, icmp, CTLFLAG_RW, 0, "ICMP");
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SYSCTL_NODE(_net_inet, IPPROTO_UDP, udp, CTLFLAG_RW, 0, "UDP");
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SYSCTL_NODE(_net_inet, IPPROTO_TCP, tcp, CTLFLAG_RW, 0, "TCP");
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#ifdef SCTP
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SYSCTL_NODE(_net_inet, IPPROTO_SCTP, sctp, CTLFLAG_RW, 0, "SCTP");
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#endif
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SYSCTL_NODE(_net_inet, IPPROTO_IGMP, igmp, CTLFLAG_RW, 0, "IGMP");
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#if defined(IPSEC) || defined(IPSEC_SUPPORT)
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/* XXX no protocol # to use, pick something "reserved" */
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SYSCTL_NODE(_net_inet, 253, ipsec, CTLFLAG_RW, 0, "IPSEC");
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SYSCTL_NODE(_net_inet, IPPROTO_AH, ah, CTLFLAG_RW, 0, "AH");
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SYSCTL_NODE(_net_inet, IPPROTO_ESP, esp, CTLFLAG_RW, 0, "ESP");
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SYSCTL_NODE(_net_inet, IPPROTO_IPCOMP, ipcomp, CTLFLAG_RW, 0, "IPCOMP");
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SYSCTL_NODE(_net_inet, IPPROTO_IPIP, ipip, CTLFLAG_RW, 0, "IPIP");
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#endif /* IPSEC */
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SYSCTL_NODE(_net_inet, IPPROTO_RAW, raw, CTLFLAG_RW, 0, "RAW");
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SYSCTL_NODE(_net_inet, OID_AUTO, accf, CTLFLAG_RW, 0,
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"Accept filters");
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