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NetBSD/sys/netinet6/in6_proto.c
dyoung 4c9b6756a5 1) Introduce a new socket option, (SOL_SOCKET, SO_NOHEADER), that 
tells a socket that it should both add a protocol header to tx'd
   datagrams and remove the header from rx'd datagrams:

        int onoff = 1, s = socket(...);
        setsockopt(s, SOL_SOCKET, SO_NOHEADER, &onoff);

2) Add an implementation of (SOL_SOCKET, SO_NOHEADER) for raw IPv4
   sockets.

3) Reorganize the protocols' pr_ctloutput implementations a bit.
   Consistently return ENOPROTOOPT when an option is unsupported,
   and EINVAL if a supported option's arguments are incorrect.
   Reorganize the flow of code so that it's more clear how/when
   options are passed down the stack until they are handled.

   Shorten some pr_ctloutput staircases for readability.

4) Extract common mbuf code into subroutines, add new sockaddr
   methods, and introduce a new subroutine, fsocreate(), for reuse
   later; use it first in sys_socket():

struct mbuf *m_getsombuf(struct socket *so)

        Create an mbuf and make its owner the socket `so'.

struct mbuf *m_intopt(struct socket *so, int val)

        Create an mbuf, make its owner the socket `so', put the
        int `val' into it, and set its length to sizeof(int).


int fsocreate(..., int *fd)

        Create a socket, a la socreate(9), put the socket into the
        given LWP's descriptor table, return the descriptor at `fd'
        on success.

void *sockaddr_addr(struct sockaddr *sa, socklen_t *slenp)
const void *sockaddr_const_addr(const struct sockaddr *sa, socklen_t *slenp)

        Extract a pointer to the address part of a sockaddr.  Write
        the length of the address  part at `slenp', if `slenp' is
        not NULL.

socklen_t sockaddr_getlen(const struct sockaddr *sa)

        Return the length of a sockaddr.  This just evaluates to
        sa->sa_len.  I only add this for consistency with code that
        appears in a portable userland library that I am going to
        import.

const struct sockaddr *sockaddr_any(const struct sockaddr *sa)

        Return the "don't care" sockaddr in the same family as
        `sa'.  This is the address a client should sobind(9) if it
        does not care the source address and, if applicable, the
        port et cetera that it uses.

const void *sockaddr_anyaddr(const struct sockaddr *sa, socklen_t *slenp)

        Return the "don't care" sockaddr in the same family as
        `sa'.  This is the address a client should sobind(9) if it
        does not care the source address and, if applicable, the
        port et cetera that it uses.
2007-09-19 04:33:42 +00:00

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/* $NetBSD: in6_proto.c,v 1.79 2007/09/19 04:33:44 dyoung 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 1.79 2007/09/19 04:33:44 dyoung 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 > 1
#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 */
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,
},
#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,
},
#endif
{ .pr_type = SOCK_RAW,
.pr_domain = &inet6domain,
.pr_protocol = IPPROTO_IPCOMP,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = ipcomp6_input,
},
#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 > 1
{ .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,
},
/* 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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