freebsd-dev/sys/netinet6/raw_ip6.c
Roy Marples 7045b1603b socket: Implement SO_RERROR
SO_RERROR indicates that receive buffer overflows should be handled as
errors. Historically receive buffer overflows have been ignored and
programs could not tell if they missed messages or messages had been
truncated because of overflows. Since programs historically do not
expect to get receive overflow errors, this behavior is not the
default.

This is really really important for programs that use route(4) to keep
in sync with the system. If we loose a message then we need to reload
the full system state, otherwise the behaviour from that point is
undefined and can lead to chasing bogus bug reports.

Reviewed by:	philip (network), kbowling (transport), gbe (manpages)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D26652
2021-07-28 09:35:09 -07:00

947 lines
24 KiB
C

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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, 1988, 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.
*
* @(#)raw_ip.c 8.2 (Berkeley) 1/4/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ipsec.h"
#include "opt_inet6.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sx.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>
#include <netinet/icmp6.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/raw_ip6.h>
#include <netinet6/in6_fib.h>
#include <netinet6/scope6_var.h>
#include <netinet6/send.h>
#include <netipsec/ipsec_support.h>
#include <machine/stdarg.h>
#define satosin6(sa) ((struct sockaddr_in6 *)(sa))
#define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa))
/*
* Raw interface to IP6 protocol.
*/
VNET_DECLARE(struct inpcbhead, ripcb);
VNET_DECLARE(struct inpcbinfo, ripcbinfo);
#define V_ripcb VNET(ripcb)
#define V_ripcbinfo VNET(ripcbinfo)
extern u_long rip_sendspace;
extern u_long rip_recvspace;
VNET_PCPUSTAT_DEFINE(struct rip6stat, rip6stat);
VNET_PCPUSTAT_SYSINIT(rip6stat);
#ifdef VIMAGE
VNET_PCPUSTAT_SYSUNINIT(rip6stat);
#endif /* VIMAGE */
/*
* Hooks for multicast routing. They all default to NULL, so leave them not
* initialized and rely on BSS being set to 0.
*/
/*
* The socket used to communicate with the multicast routing daemon.
*/
VNET_DEFINE(struct socket *, ip6_mrouter);
/*
* The various mrouter functions.
*/
int (*ip6_mrouter_set)(struct socket *, struct sockopt *);
int (*ip6_mrouter_get)(struct socket *, struct sockopt *);
int (*ip6_mrouter_done)(void);
int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *, struct mbuf *);
int (*mrt6_ioctl)(u_long, caddr_t);
/*
* Setup generic address and protocol structures for raw_input routine, then
* pass them along with mbuf chain.
*/
int
rip6_input(struct mbuf **mp, int *offp, int proto)
{
struct ifnet *ifp;
struct mbuf *m = *mp;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct inpcb *inp;
struct inpcb *last = NULL;
struct mbuf *opts = NULL;
struct sockaddr_in6 fromsa;
NET_EPOCH_ASSERT();
RIP6STAT_INC(rip6s_ipackets);
init_sin6(&fromsa, m, 0); /* general init */
ifp = m->m_pkthdr.rcvif;
CK_LIST_FOREACH(inp, &V_ripcb, inp_list) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (inp->inp_ip_p &&
inp->inp_ip_p != proto)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
continue;
if (last != NULL) {
struct mbuf *n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
/*
* Check AH/ESP integrity.
*/
if (IPSEC_ENABLED(ipv6)) {
if (n != NULL &&
IPSEC_CHECK_POLICY(ipv6, n, last) != 0) {
m_freem(n);
/* Do not inject data into pcb. */
n = NULL;
}
}
#endif /* IPSEC */
if (n) {
if (last->inp_flags & INP_CONTROLOPTS ||
last->inp_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(last, n, &opts);
/* strip intermediate headers */
m_adj(n, *offp);
if (sbappendaddr(&last->inp_socket->so_rcv,
(struct sockaddr *)&fromsa,
n, opts) == 0) {
soroverflow(last->inp_socket);
m_freem(n);
if (opts)
m_freem(opts);
RIP6STAT_INC(rip6s_fullsock);
} else
sorwakeup(last->inp_socket);
opts = NULL;
}
INP_RUNLOCK(last);
last = NULL;
}
INP_RLOCK(inp);
if (__predict_false(inp->inp_flags2 & INP_FREED))
goto skip_2;
if (jailed_without_vnet(inp->inp_cred)) {
/*
* Allow raw socket in jail to receive multicast;
* assume process had PRIV_NETINET_RAW at attach,
* and fall through into normal filter path if so.
*/
if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
prison_check_ip6(inp->inp_cred,
&ip6->ip6_dst) != 0)
goto skip_2;
}
if (inp->in6p_cksum != -1) {
RIP6STAT_INC(rip6s_isum);
if (m->m_pkthdr.len - (*offp + inp->in6p_cksum) < 2 ||
in6_cksum(m, proto, *offp,
m->m_pkthdr.len - *offp)) {
RIP6STAT_INC(rip6s_badsum);
/*
* Drop the received message, don't send an
* ICMP6 message. Set proto to IPPROTO_NONE
* to achieve that.
*/
proto = IPPROTO_NONE;
goto skip_2;
}
}
/*
* If this raw socket has multicast state, and we
* have received a multicast, check if this socket
* should receive it, as multicast filtering is now
* the responsibility of the transport layer.
*/
if (inp->in6p_moptions &&
IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
/*
* If the incoming datagram is for MLD, allow it
* through unconditionally to the raw socket.
*
* Use the M_RTALERT_MLD flag to check for MLD
* traffic without having to inspect the mbuf chain
* more deeply, as all MLDv1/v2 host messages MUST
* contain the Router Alert option.
*
* In the case of MLDv1, we may not have explicitly
* joined the group, and may have set IFF_ALLMULTI
* on the interface. im6o_mc_filter() may discard
* control traffic we actually need to see.
*
* Userland multicast routing daemons should continue
* filter the control traffic appropriately.
*/
int blocked;
blocked = MCAST_PASS;
if ((m->m_flags & M_RTALERT_MLD) == 0) {
struct sockaddr_in6 mcaddr;
bzero(&mcaddr, sizeof(struct sockaddr_in6));
mcaddr.sin6_len = sizeof(struct sockaddr_in6);
mcaddr.sin6_family = AF_INET6;
mcaddr.sin6_addr = ip6->ip6_dst;
blocked = im6o_mc_filter(inp->in6p_moptions,
ifp,
(struct sockaddr *)&mcaddr,
(struct sockaddr *)&fromsa);
}
if (blocked != MCAST_PASS) {
IP6STAT_INC(ip6s_notmember);
goto skip_2;
}
}
last = inp;
continue;
skip_2:
INP_RUNLOCK(inp);
}
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
/*
* Check AH/ESP integrity.
*/
if (IPSEC_ENABLED(ipv6) && last != NULL &&
IPSEC_CHECK_POLICY(ipv6, m, last) != 0) {
m_freem(m);
IP6STAT_DEC(ip6s_delivered);
/* Do not inject data into pcb. */
INP_RUNLOCK(last);
} else
#endif /* IPSEC */
if (last != NULL) {
if (last->inp_flags & INP_CONTROLOPTS ||
last->inp_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(last, m, &opts);
/* Strip intermediate headers. */
m_adj(m, *offp);
if (sbappendaddr(&last->inp_socket->so_rcv,
(struct sockaddr *)&fromsa, m, opts) == 0) {
soroverflow(last->inp_socket);
m_freem(m);
if (opts)
m_freem(opts);
RIP6STAT_INC(rip6s_fullsock);
} else
sorwakeup(last->inp_socket);
INP_RUNLOCK(last);
} else {
RIP6STAT_INC(rip6s_nosock);
if (m->m_flags & M_MCAST)
RIP6STAT_INC(rip6s_nosockmcast);
if (proto == IPPROTO_NONE)
m_freem(m);
else
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_NEXTHEADER,
ip6_get_prevhdr(m, *offp));
IP6STAT_DEC(ip6s_delivered);
}
return (IPPROTO_DONE);
}
void
rip6_ctlinput(int cmd, struct sockaddr *sa, void *d)
{
struct ip6ctlparam *ip6cp = NULL;
const struct sockaddr_in6 *sa6_src = NULL;
void *cmdarg;
struct inpcb *(*notify)(struct inpcb *, int) = in6_rtchange;
if (sa->sa_family != AF_INET6 ||
sa->sa_len != sizeof(struct sockaddr_in6))
return;
if ((unsigned)cmd >= PRC_NCMDS)
return;
if (PRC_IS_REDIRECT(cmd))
notify = in6_rtchange, d = NULL;
else if (cmd == PRC_HOSTDEAD)
d = NULL;
else if (inet6ctlerrmap[cmd] == 0)
return;
/*
* If the parameter is from icmp6, decode it.
*/
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
cmdarg = ip6cp->ip6c_cmdarg;
sa6_src = ip6cp->ip6c_src;
} else {
cmdarg = NULL;
sa6_src = &sa6_any;
}
(void) in6_pcbnotify(&V_ripcbinfo, sa, 0,
(const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify);
}
/*
* Generate IPv6 header and pass packet to ip6_output. Tack on options user
* may have setup with control call.
*/
int
rip6_output(struct mbuf *m, struct socket *so, ...)
{
struct epoch_tracker et;
struct mbuf *control;
struct m_tag *mtag;
struct sockaddr_in6 *dstsock;
struct ip6_hdr *ip6;
struct inpcb *inp;
u_int plen = m->m_pkthdr.len;
int error = 0;
struct ip6_pktopts opt, *optp;
struct ifnet *oifp = NULL;
int type = 0, code = 0; /* for ICMPv6 output statistics only */
int scope_ambiguous = 0;
int use_defzone = 0;
int hlim = 0;
struct in6_addr in6a;
va_list ap;
va_start(ap, so);
dstsock = va_arg(ap, struct sockaddr_in6 *);
control = va_arg(ap, struct mbuf *);
va_end(ap);
inp = sotoinpcb(so);
INP_WLOCK(inp);
if (control != NULL) {
NET_EPOCH_ENTER(et);
error = ip6_setpktopts(control, &opt,
inp->in6p_outputopts, so->so_cred,
so->so_proto->pr_protocol);
NET_EPOCH_EXIT(et);
if (error != 0) {
goto bad;
}
optp = &opt;
} else
optp = inp->in6p_outputopts;
/*
* Check and convert scope zone ID into internal form.
*
* XXX: we may still need to determine the zone later.
*/
if (!(so->so_state & SS_ISCONNECTED)) {
if (!optp || !optp->ip6po_pktinfo ||
!optp->ip6po_pktinfo->ipi6_ifindex)
use_defzone = V_ip6_use_defzone;
if (dstsock->sin6_scope_id == 0 && !use_defzone)
scope_ambiguous = 1;
if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
goto bad;
}
/*
* For an ICMPv6 packet, we should know its type and code to update
* statistics.
*/
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
struct icmp6_hdr *icmp6;
if (m->m_len < sizeof(struct icmp6_hdr) &&
(m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) {
error = ENOBUFS;
goto bad;
}
icmp6 = mtod(m, struct icmp6_hdr *);
type = icmp6->icmp6_type;
code = icmp6->icmp6_code;
}
M_PREPEND(m, sizeof(*ip6), M_NOWAIT);
if (m == NULL) {
error = ENOBUFS;
goto bad;
}
ip6 = mtod(m, struct ip6_hdr *);
#ifdef ROUTE_MPATH
if (CALC_FLOWID_OUTBOUND) {
uint32_t hash_type, hash_val;
hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
&dstsock->sin6_addr, 0, 0, so->so_proto->pr_protocol,
&hash_type);
inp->inp_flowid = hash_val;
inp->inp_flowtype = hash_type;
}
#endif
/*
* Source address selection.
*/
NET_EPOCH_ENTER(et);
error = in6_selectsrc_socket(dstsock, optp, inp, so->so_cred,
scope_ambiguous, &in6a, &hlim);
NET_EPOCH_EXIT(et);
if (error)
goto bad;
error = prison_check_ip6(inp->inp_cred, &in6a);
if (error != 0)
goto bad;
ip6->ip6_src = in6a;
ip6->ip6_dst = dstsock->sin6_addr;
/*
* Fill in the rest of the IPv6 header fields.
*/
ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
(inp->inp_flow & IPV6_FLOWINFO_MASK);
ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
(IPV6_VERSION & IPV6_VERSION_MASK);
/*
* ip6_plen will be filled in ip6_output, so not fill it here.
*/
ip6->ip6_nxt = inp->inp_ip_p;
ip6->ip6_hlim = hlim;
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 ||
inp->in6p_cksum != -1) {
struct mbuf *n;
int off;
u_int16_t *p;
/* Compute checksum. */
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6)
off = offsetof(struct icmp6_hdr, icmp6_cksum);
else
off = inp->in6p_cksum;
if (plen < off + 2) {
error = EINVAL;
goto bad;
}
off += sizeof(struct ip6_hdr);
n = m;
while (n && n->m_len <= off) {
off -= n->m_len;
n = n->m_next;
}
if (!n)
goto bad;
p = (u_int16_t *)(mtod(n, caddr_t) + off);
*p = 0;
*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
}
/*
* Send RA/RS messages to user land for protection, before sending
* them to rtadvd/rtsol.
*/
if ((send_sendso_input_hook != NULL) &&
so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
switch (type) {
case ND_ROUTER_ADVERT:
case ND_ROUTER_SOLICIT:
mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
sizeof(unsigned short), M_NOWAIT);
if (mtag == NULL)
goto bad;
m_tag_prepend(m, mtag);
}
}
NET_EPOCH_ENTER(et);
error = ip6_output(m, optp, NULL, 0, inp->in6p_moptions, &oifp, inp);
NET_EPOCH_EXIT(et);
if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {
if (oifp)
icmp6_ifoutstat_inc(oifp, type, code);
ICMP6STAT_INC(icp6s_outhist[type]);
} else
RIP6STAT_INC(rip6s_opackets);
goto freectl;
bad:
if (m)
m_freem(m);
freectl:
if (control != NULL) {
ip6_clearpktopts(&opt, -1);
m_freem(control);
}
INP_WUNLOCK(inp);
return (error);
}
/*
* Raw IPv6 socket option processing.
*/
int
rip6_ctloutput(struct socket *so, struct sockopt *sopt)
{
struct inpcb *inp;
int error;
if (sopt->sopt_level == IPPROTO_ICMPV6)
/*
* XXX: is it better to call icmp6_ctloutput() directly
* from protosw?
*/
return (icmp6_ctloutput(so, sopt));
else if (sopt->sopt_level != IPPROTO_IPV6) {
if (sopt->sopt_level == SOL_SOCKET &&
sopt->sopt_name == SO_SETFIB) {
inp = sotoinpcb(so);
INP_WLOCK(inp);
inp->inp_inc.inc_fibnum = so->so_fibnum;
INP_WUNLOCK(inp);
return (0);
}
return (EINVAL);
}
error = 0;
switch (sopt->sopt_dir) {
case SOPT_GET:
switch (sopt->sopt_name) {
case MRT6_INIT:
case MRT6_DONE:
case MRT6_ADD_MIF:
case MRT6_DEL_MIF:
case MRT6_ADD_MFC:
case MRT6_DEL_MFC:
case MRT6_PIM:
error = ip6_mrouter_get ? ip6_mrouter_get(so, sopt) :
EOPNOTSUPP;
break;
case IPV6_CHECKSUM:
error = ip6_raw_ctloutput(so, sopt);
break;
default:
error = ip6_ctloutput(so, sopt);
break;
}
break;
case SOPT_SET:
switch (sopt->sopt_name) {
case MRT6_INIT:
case MRT6_DONE:
case MRT6_ADD_MIF:
case MRT6_DEL_MIF:
case MRT6_ADD_MFC:
case MRT6_DEL_MFC:
case MRT6_PIM:
error = ip6_mrouter_set ? ip6_mrouter_set(so, sopt) :
EOPNOTSUPP;
break;
case IPV6_CHECKSUM:
error = ip6_raw_ctloutput(so, sopt);
break;
default:
error = ip6_ctloutput(so, sopt);
break;
}
break;
}
return (error);
}
static int
rip6_attach(struct socket *so, int proto, struct thread *td)
{
struct inpcb *inp;
struct icmp6_filter *filter;
int error;
inp = sotoinpcb(so);
KASSERT(inp == NULL, ("rip6_attach: inp != NULL"));
error = priv_check(td, PRIV_NETINET_RAW);
if (error)
return (error);
error = soreserve(so, rip_sendspace, rip_recvspace);
if (error)
return (error);
filter = malloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT);
if (filter == NULL)
return (ENOMEM);
INP_INFO_WLOCK(&V_ripcbinfo);
error = in_pcballoc(so, &V_ripcbinfo);
if (error) {
INP_INFO_WUNLOCK(&V_ripcbinfo);
free(filter, M_PCB);
return (error);
}
inp = (struct inpcb *)so->so_pcb;
INP_INFO_WUNLOCK(&V_ripcbinfo);
inp->inp_vflag |= INP_IPV6;
inp->inp_ip_p = (long)proto;
inp->in6p_hops = -1; /* use kernel default */
inp->in6p_cksum = -1;
inp->in6p_icmp6filt = filter;
ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
INP_WUNLOCK(inp);
return (0);
}
static void
rip6_detach(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_detach: inp == NULL"));
if (so == V_ip6_mrouter && ip6_mrouter_done)
ip6_mrouter_done();
/* xxx: RSVP */
INP_INFO_WLOCK(&V_ripcbinfo);
INP_WLOCK(inp);
free(inp->in6p_icmp6filt, M_PCB);
in_pcbdetach(inp);
in_pcbfree(inp);
INP_INFO_WUNLOCK(&V_ripcbinfo);
}
/* XXXRW: This can't ever be called. */
static void
rip6_abort(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_abort: inp == NULL"));
soisdisconnected(so);
}
static void
rip6_close(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_close: inp == NULL"));
soisdisconnected(so);
}
static int
rip6_disconnect(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_disconnect: inp == NULL"));
if ((so->so_state & SS_ISCONNECTED) == 0)
return (ENOTCONN);
inp->in6p_faddr = in6addr_any;
rip6_abort(so);
return (0);
}
static int
rip6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct epoch_tracker et;
struct inpcb *inp;
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
struct ifaddr *ifa = NULL;
int error = 0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_bind: inp == NULL"));
if (nam->sa_family != AF_INET6)
return (EAFNOSUPPORT);
if (nam->sa_len != sizeof(*addr))
return (EINVAL);
if ((error = prison_check_ip6(td->td_ucred, &addr->sin6_addr)) != 0)
return (error);
if (CK_STAILQ_EMPTY(&V_ifnet) || addr->sin6_family != AF_INET6)
return (EADDRNOTAVAIL);
if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
return (error);
NET_EPOCH_ENTER(et);
if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) &&
(ifa = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) {
NET_EPOCH_EXIT(et);
return (EADDRNOTAVAIL);
}
if (ifa != NULL &&
((struct in6_ifaddr *)ifa)->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|
IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) {
NET_EPOCH_EXIT(et);
return (EADDRNOTAVAIL);
}
NET_EPOCH_EXIT(et);
INP_INFO_WLOCK(&V_ripcbinfo);
INP_WLOCK(inp);
inp->in6p_laddr = addr->sin6_addr;
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_ripcbinfo);
return (0);
}
static int
rip6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
struct inpcb *inp;
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam;
struct in6_addr in6a;
struct epoch_tracker et;
int error = 0, scope_ambiguous = 0;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_connect: inp == NULL"));
if (nam->sa_len != sizeof(*addr))
return (EINVAL);
if (CK_STAILQ_EMPTY(&V_ifnet))
return (EADDRNOTAVAIL);
if (addr->sin6_family != AF_INET6)
return (EAFNOSUPPORT);
/*
* Application should provide a proper zone ID or the use of default
* zone IDs should be enabled. Unfortunately, some applications do
* not behave as it should, so we need a workaround. Even if an
* appropriate ID is not determined, we'll see if we can determine
* the outgoing interface. If we can, determine the zone ID based on
* the interface below.
*/
if (addr->sin6_scope_id == 0 && !V_ip6_use_defzone)
scope_ambiguous = 1;
if ((error = sa6_embedscope(addr, V_ip6_use_defzone)) != 0)
return (error);
INP_INFO_WLOCK(&V_ripcbinfo);
INP_WLOCK(inp);
/* Source address selection. XXX: need pcblookup? */
NET_EPOCH_ENTER(et);
error = in6_selectsrc_socket(addr, inp->in6p_outputopts,
inp, so->so_cred, scope_ambiguous, &in6a, NULL);
NET_EPOCH_EXIT(et);
if (error) {
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_ripcbinfo);
return (error);
}
inp->in6p_faddr = addr->sin6_addr;
inp->in6p_laddr = in6a;
soisconnected(so);
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_ripcbinfo);
return (0);
}
static int
rip6_shutdown(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_shutdown: inp == NULL"));
INP_WLOCK(inp);
socantsendmore(so);
INP_WUNLOCK(inp);
return (0);
}
static int
rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct thread *td)
{
struct inpcb *inp;
struct sockaddr_in6 tmp;
struct sockaddr_in6 *dst;
int error;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("rip6_send: inp == NULL"));
/* Always copy sockaddr to avoid overwrites. */
/* Unlocked read. */
if (so->so_state & SS_ISCONNECTED) {
if (nam) {
error = EISCONN;
goto release;
}
/* XXX */
bzero(&tmp, sizeof(tmp));
tmp.sin6_family = AF_INET6;
tmp.sin6_len = sizeof(struct sockaddr_in6);
INP_RLOCK(inp);
bcopy(&inp->in6p_faddr, &tmp.sin6_addr,
sizeof(struct in6_addr));
INP_RUNLOCK(inp);
dst = &tmp;
} else {
error = 0;
if (nam == NULL)
error = ENOTCONN;
else if (nam->sa_family != AF_INET6)
error = EAFNOSUPPORT;
else if (nam->sa_len != sizeof(struct sockaddr_in6))
error = EINVAL;
if (error != 0)
goto release;
tmp = *(struct sockaddr_in6 *)nam;
dst = &tmp;
if (dst->sin6_family == AF_UNSPEC) {
/*
* XXX: we allow this case for backward
* compatibility to buggy applications that
* rely on old (and wrong) kernel behavior.
*/
log(LOG_INFO, "rip6 SEND: address family is "
"unspec. Assume AF_INET6\n");
dst->sin6_family = AF_INET6;
} else if (dst->sin6_family != AF_INET6) {
error = EAFNOSUPPORT;
goto release;
}
}
return (rip6_output(m, so, dst, control));
release:
if (control != NULL)
m_freem(control);
m_freem(m);
return (error);
}
struct pr_usrreqs rip6_usrreqs = {
.pru_abort = rip6_abort,
.pru_attach = rip6_attach,
.pru_bind = rip6_bind,
.pru_connect = rip6_connect,
.pru_control = in6_control,
.pru_detach = rip6_detach,
.pru_disconnect = rip6_disconnect,
.pru_peeraddr = in6_getpeeraddr,
.pru_send = rip6_send,
.pru_shutdown = rip6_shutdown,
.pru_sockaddr = in6_getsockaddr,
.pru_close = rip6_close,
};