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gems-kernel/source/THIRDPARTY/xnu/bsd/netinet6/raw_ip6.c
Sam Sneed f5727805f2 add darwin/xnu functionality
2024-06-03 11:29:39 -05:00

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/*
* Copyright (c) 2000-2021 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* 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.
*
* $FreeBSD: src/sys/netinet6/raw_ip6.c,v 1.7.2.4 2001/07/29 19:32:40 ume Exp $
*/
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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/param.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/mcache.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <net/if.h>
#include <net/net_api_stats.h>
#include <net/route.h>
#include <net/if_types.h>
#include <net/content_filter.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/in_tclass.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet/in_pcb.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/nd6.h>
#include <netinet6/ip6protosw.h>
#include <netinet6/scope6_var.h>
#include <netinet6/raw_ip6.h>
#if IPSEC
#include <netinet6/ipsec.h>
#include <netinet6/ipsec6.h>
#endif /*IPSEC*/
#if NECP
#include <net/necp.h>
#endif
/*
* Raw interface to IP6 protocol.
*/
extern struct inpcbhead ripcb;
extern struct inpcbinfo ripcbinfo;
extern u_int32_t rip_sendspace;
extern u_int32_t rip_recvspace;
struct rip6stat rip6stat;
/*
* 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 mbuf *m = *mp;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
struct inpcb *in6p;
struct inpcb *last = 0;
struct mbuf *opts = NULL;
struct sockaddr_in6 rip6src;
int ret;
struct ifnet *ifp = m->m_pkthdr.rcvif;
boolean_t is_wake_pkt = false;
/* Expect 32-bit aligned data pointer on strict-align platforms */
MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
rip6stat.rip6s_ipackets++;
init_sin6(&rip6src, m); /* general init */
if ((m->m_flags & M_PKTHDR) && (m->m_pkthdr.pkt_flags & PKTF_WAKE_PKT)) {
is_wake_pkt = true;
}
lck_rw_lock_shared(&ripcbinfo.ipi_lock);
LIST_FOREACH(in6p, &ripcb, inp_list) {
if ((in6p->in6p_vflag & INP_IPV6) == 0) {
continue;
}
if (in6p->in6p_ip6_nxt &&
in6p->in6p_ip6_nxt != proto) {
continue;
}
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
!in6_are_addr_equal_scoped(&in6p->in6p_laddr, &ip6->ip6_dst, in6p->inp_lifscope, ifp->if_index)) {
continue;
}
if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
!in6_are_addr_equal_scoped(&in6p->in6p_faddr, &ip6->ip6_src, in6p->inp_fifscope, ifp->if_index)) {
continue;
}
if (inp_restricted_recv(in6p, ifp)) {
continue;
}
if (proto == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
rip6stat.rip6s_isum++;
if (in6_cksum(m, ip6->ip6_nxt, *offp,
m->m_pkthdr.len - *offp)) {
rip6stat.rip6s_badsum++;
continue;
}
}
if (last) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
#if NECP
if (n && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
&ip6->ip6_dst, &ip6->ip6_src, ifp, 0, NULL, NULL, NULL, NULL)) {
m_freem(n);
/* do not inject data into pcb */
} else
#endif /* NECP */
if (n) {
if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
SOFLOW_ENABLED(last->in6p_socket) ||
SO_RECV_CONTROL_OPTS(last->in6p_socket)) {
ret = ip6_savecontrol(last, n, &opts);
if (ret != 0) {
m_freem(n);
m_freem(opts);
opts = NULL;
last = in6p;
continue;
}
}
/* strip intermediate headers */
m_adj(n, *offp);
so_recv_data_stat(last->in6p_socket, m, 0);
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&rip6src,
n, opts, NULL) == 0) {
rip6stat.rip6s_fullsock++;
} else {
sorwakeup(last->in6p_socket);
}
if (is_wake_pkt) {
soevent(in6p->in6p_socket,
SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
}
opts = NULL;
}
}
last = in6p;
}
#if NECP
if (last && !necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
&ip6->ip6_dst, &ip6->ip6_src, ifp, 0, NULL, NULL, NULL, NULL)) {
m_freem(m);
ip6stat.ip6s_delivered--;
/* do not inject data into pcb */
} else
#endif /* NECP */
if (last) {
if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
SOFLOW_ENABLED(last->in6p_socket) ||
SO_RECV_CONTROL_OPTS(last->in6p_socket)) {
ret = ip6_savecontrol(last, m, &opts);
if (ret != 0) {
m_freem(m);
m_freem(opts);
ip6stat.ip6s_delivered--;
goto unlock;
}
}
/* strip intermediate headers */
m_adj(m, *offp);
so_recv_data_stat(last->in6p_socket, m, 0);
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&rip6src, m, opts, NULL) == 0) {
rip6stat.rip6s_fullsock++;
} else {
sorwakeup(last->in6p_socket);
}
if (is_wake_pkt) {
soevent(last->in6p_socket,
SO_FILT_HINT_LOCKED | SO_FILT_HINT_WAKE_PKT);
}
} else {
rip6stat.rip6s_nosock++;
if (m->m_flags & M_MCAST) {
rip6stat.rip6s_nosockmcast++;
}
if (proto == IPPROTO_NONE) {
m_freem(m);
} else {
char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_NEXTHEADER,
(int)(prvnxtp - mtod(m, char *)));
}
ip6stat.ip6s_delivered--;
}
unlock:
lck_rw_done(&ripcbinfo.ipi_lock);
return IPPROTO_DONE;
}
void
rip6_ctlinput(
int cmd,
struct sockaddr *sa,
void *d,
__unused struct ifnet *ifp)
{
struct ip6_hdr *ip6 = NULL;
struct mbuf *m = NULL;
void *cmdarg = NULL;
int off = 0;
struct ip6ctlparam *ip6cp = NULL;
const struct sockaddr_in6 *sa6_src = NULL;
void (*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;
m = ip6cp->ip6c_m;
ip6 = ip6cp->ip6c_ip6;
off = ip6cp->ip6c_off;
cmdarg = ip6cp->ip6c_cmdarg;
sa6_src = ip6cp->ip6c_src;
} else {
m = NULL;
ip6 = NULL;
cmdarg = NULL;
sa6_src = &sa6_any;
}
(void) in6_pcbnotify(&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 sockaddr_in6 *dstsock,
struct mbuf *control,
int israw)
{
struct in6_addr *dst;
struct ip6_hdr *ip6;
struct inpcb *in6p;
u_int plen = m->m_pkthdr.len;
int error = 0;
struct ip6_pktopts opt, *optp = NULL;
struct ip6_moptions *im6o = NULL;
struct ifnet *oifp = NULL;
int type = 0, code = 0; /* for ICMPv6 output statistics only */
int sotc = SO_TC_UNSPEC;
int netsvctype = _NET_SERVICE_TYPE_UNSPEC;
struct ip6_out_args ip6oa;
int flags = IPV6_OUTARGS;
struct sockaddr_in6 tmp;
#if CONTENT_FILTER
struct m_tag *cfil_tag = NULL;
bool cfil_faddr_use = false;
uint32_t cfil_so_state_change_cnt = 0;
uint32_t cfil_so_options = 0;
uint32_t sifscope = IFSCOPE_NONE, difscope = IFSCOPE_NONE;
struct sockaddr *cfil_faddr = NULL;
struct sockaddr_in6 *cfil_sin6 = NULL;
#endif
in6p = sotoin6pcb(so);
if (in6p == NULL) {
error = EINVAL;
goto bad;
}
#if CONTENT_FILTER
/*
* If socket is subject to Content Filter and no addr is passed in,
* retrieve CFIL saved state from mbuf and use it if necessary.
*/
if (CFIL_DGRAM_FILTERED(so) && !dstsock) {
cfil_tag = cfil_dgram_get_socket_state(m, &cfil_so_state_change_cnt, &cfil_so_options, &cfil_faddr, NULL);
if (cfil_tag) {
cfil_sin6 = SIN6(cfil_faddr);
if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
/*
* Socket is unconnected, simply use the saved faddr as 'addr' to go through
* the connect/disconnect logic.
*/
dstsock = cfil_sin6;
} else if ((so->so_state_change_cnt != cfil_so_state_change_cnt) &&
(in6p->in6p_fport != cfil_sin6->sin6_port ||
!in6_are_addr_equal_scoped(&in6p->in6p_faddr, &cfil_sin6->sin6_addr, in6p->inp_fifscope, cfil_sin6->sin6_scope_id))) {
/*
* Socket is connected but socket state and dest addr/port changed.
* We need to use the saved faddr and socket options.
*/
cfil_faddr_use = true;
}
}
}
#endif
/* always copy sockaddr to avoid overwrites */
if (so->so_state & SS_ISCONNECTED) {
if (dstsock != NULL) {
error = EISCONN;
goto bad;
}
/* XXX */
bzero(&tmp, sizeof(tmp));
tmp.sin6_family = AF_INET6;
tmp.sin6_len = sizeof(struct sockaddr_in6);
bcopy(
#if CONTENT_FILTER
cfil_faddr_use ? &cfil_sin6->sin6_addr :
#endif
&in6p->in6p_faddr, &tmp.sin6_addr, sizeof(struct in6_addr));
dstsock = &tmp;
} else {
if (dstsock == NULL) {
error = ENOTCONN;
goto bad;
}
tmp = *dstsock;
dstsock = &tmp;
}
#if ENABLE_DEFAULT_SCOPE
if (dstsock->sin6_scope_id == 0) { /* not change if specified */
dstsock->sin6_scope_id = scope6_addr2default(&dstsock->sin6_addr);
}
#endif
bzero(&ip6oa, sizeof(ip6oa));
ip6oa.ip6oa_boundif = IFSCOPE_NONE;
ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF;
if (in6p == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(in6p))
#endif /* NECP */
) {
if (in6p == NULL) {
error = EINVAL;
} else {
error = EPROTOTYPE;
}
goto bad;
}
if (dstsock != NULL && IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) {
error = EINVAL;
goto bad;
}
if (in6p->inp_flags & INP_BOUND_IF) {
ip6oa.ip6oa_boundif = in6p->inp_boundifp->if_index;
ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
} else if (!in6_embedded_scope && IN6_IS_SCOPE_EMBED(&in6p->in6p_faddr)) {
ip6oa.ip6oa_boundif = dstsock->sin6_scope_id;
ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
}
if (INP_NO_CELLULAR(in6p)) {
ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
}
if (INP_NO_EXPENSIVE(in6p)) {
ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
}
if (INP_NO_CONSTRAINED(in6p)) {
ip6oa.ip6oa_flags |= IP6OAF_NO_CONSTRAINED;
}
if (INP_AWDL_UNRESTRICTED(in6p)) {
ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
}
if (INP_INTCOPROC_ALLOWED(in6p)) {
ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED;
}
if (INP_MANAGEMENT_ALLOWED(in6p)) {
ip6oa.ip6oa_flags |= IP6OAF_MANAGEMENT_ALLOWED;
}
dst = &dstsock->sin6_addr;
if (control) {
sotc = so_tc_from_control(control, &netsvctype);
if ((error = ip6_setpktopts(control, &opt, NULL,
SOCK_PROTO(so))) != 0) {
goto bad;
}
optp = &opt;
} else {
optp = in6p->in6p_outputopts;
}
if (sotc == SO_TC_UNSPEC) {
sotc = so->so_traffic_class;
netsvctype = so->so_netsvctype;
}
ip6oa.ip6oa_sotc = sotc;
ip6oa.ip6oa_netsvctype = netsvctype;
/*
* For an ICMPv6 packet, we should know its type and code
* to update statistics.
*/
if (SOCK_PROTO(so) == 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;
}
if (in6p->inp_flowhash == 0) {
inp_calc_flowhash(in6p);
ASSERT(in6p->inp_flowhash != 0);
}
/* update flowinfo - RFC 6437 */
if (in6p->inp_flow == 0 && in6p->in6p_flags & IN6P_AUTOFLOWLABEL) {
in6p->inp_flow &= ~IPV6_FLOWLABEL_MASK;
in6p->inp_flow |=
(htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
}
M_PREPEND(m, sizeof(*ip6), M_WAIT, 1);
if (m == NULL) {
error = ENOBUFS;
goto bad;
}
ip6 = mtod(m, struct ip6_hdr *);
/*
* Next header might not be ICMP6 but use its pseudo header anyway.
*/
ip6->ip6_dst = *dst;
im6o = in6p->in6p_moptions;
/*
* If the scope of the destination is link-local, embed the interface
* index in the address.
*
* XXX advanced-api value overrides sin6_scope_id
*/
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
struct in6_pktinfo *pi;
struct ifnet *im6o_multicast_ifp = NULL;
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && im6o != NULL) {
IM6O_LOCK(im6o);
im6o_multicast_ifp = im6o->im6o_multicast_ifp;
IM6O_UNLOCK(im6o);
}
/*
* XXX Boundary check is assumed to be already done in
* ip6_setpktoptions().
*/
ifnet_head_lock_shared();
if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) {
if (in6_embedded_scope) {
ip6->ip6_dst.s6_addr16[1] = htons((uint16_t)pi->ipi6_ifindex);
}
oifp = ifindex2ifnet[pi->ipi6_ifindex];
difscope = pi->ipi6_ifindex;
if (oifp != NULL) {
ifnet_reference(oifp);
}
} else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
im6o != NULL && im6o_multicast_ifp != NULL) {
oifp = im6o_multicast_ifp;
ifnet_reference(oifp);
if (in6_embedded_scope) {
ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index);
}
difscope = oifp->if_index;
} else if (dstsock->sin6_scope_id) {
/*
* boundary check
*
* Sinced stsock->sin6_scope_id is unsigned, we don't
* need to check if it's < 0
*/
if (!IF_INDEX_IN_RANGE(dstsock->sin6_scope_id)) {
error = ENXIO; /* XXX EINVAL? */
ifnet_head_done();
goto bad;
}
if (in6_embedded_scope) {
ip6->ip6_dst.s6_addr16[1]
= htons(dstsock->sin6_scope_id & 0xffff); /*XXX*/
}
difscope = dstsock->sin6_scope_id;
}
ifnet_head_done();
ip6_output_setdstifscope(m, difscope, NULL);
}
/*
* Source address selection.
*/
{
struct in6_addr *in6a;
struct in6_addr storage;
u_short index = 0;
if (israw != 0 && optp && optp->ip6po_pktinfo && !IN6_IS_ADDR_UNSPECIFIED(&optp->ip6po_pktinfo->ipi6_addr)) {
in6a = &optp->ip6po_pktinfo->ipi6_addr;
flags |= IPV6_FLAG_NOSRCIFSEL;
sifscope = optp->ip6po_pktinfo->ipi6_ifindex;
} else {
struct ifnet *src_ifp = NULL;
in6a = in6_selectsrc(dstsock, optp, in6p,
&in6p->in6p_route, &src_ifp, &storage, ip6oa.ip6oa_boundif,
&error);
if (src_ifp != NULL) {
in6p->inp_lifscope = src_ifp->if_index;
ifnet_release(src_ifp);
} else {
in6p->inp_lifscope = ip6oa.ip6oa_boundif;
}
if (in6a != 0) {
ip6oa.ip6oa_flags |= IP6OAF_BOUND_SRCADDR;
} else {
if (error == 0) {
error = EADDRNOTAVAIL;
}
goto bad;
}
}
ip6->ip6_src = *in6a;
if (IN6_IS_SCOPE_EMBED(in6a) && sifscope == IFSCOPE_NONE) {
sifscope = difscope;
}
ip6_output_setsrcifscope(m, sifscope, NULL);
if (in6p->in6p_route.ro_rt != NULL) {
RT_LOCK(in6p->in6p_route.ro_rt);
if (in6p->in6p_route.ro_rt->rt_ifp != NULL) {
index = in6p->in6p_route.ro_rt->rt_ifp->if_index;
}
RT_UNLOCK(in6p->in6p_route.ro_rt);
if (oifp != NULL) {
ifnet_release(oifp);
}
ifnet_head_lock_shared();
if (!IF_INDEX_IN_RANGE(index)) {
panic("bad if_index on interface from route");
}
oifp = ifindex2ifnet[index];
if (oifp != NULL) {
ifnet_reference(oifp);
}
ifnet_head_done();
}
}
ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
(in6p->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 = in6p->in6p_ip6_nxt;
ip6->ip6_hlim = in6_selecthlim(in6p, oifp);
if (SOCK_PROTO(so) == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) {
struct mbuf *n;
int off;
u_int16_t *p;
/* compute checksum */
if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
off = offsetof(struct icmp6_hdr, icmp6_cksum);
} else {
off = in6p->in6p_cksum;
}
if (plen < (unsigned int)(off + 1)) {
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 *)(void *)(mtod(n, caddr_t) + off);
*p = 0;
*p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen);
}
#if NECP
{
necp_kernel_policy_id policy_id;
necp_kernel_policy_id skip_policy_id;
u_int32_t route_rule_id;
u_int32_t pass_flags;
/*
* We need a route to perform NECP route rule checks
*/
if ((net_qos_policy_restricted != 0 &&
ROUTE_UNUSABLE(&in6p->in6p_route))
#if CONTENT_FILTER
|| cfil_faddr_use
#endif
) {
struct sockaddr_in6 to;
struct sockaddr_in6 from;
ROUTE_RELEASE(&in6p->in6p_route);
bzero(&from, sizeof(struct sockaddr_in6));
from.sin6_family = AF_INET6;
from.sin6_len = sizeof(struct sockaddr_in6);
from.sin6_addr = ip6->ip6_src;
bzero(&to, sizeof(struct sockaddr_in6));
to.sin6_family = AF_INET6;
to.sin6_len = sizeof(struct sockaddr_in6);
to.sin6_addr = ip6->ip6_dst;
in6p->in6p_route.ro_dst.sin6_family = AF_INET6;
in6p->in6p_route.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
((struct sockaddr_in6 *)(void *)&in6p->in6p_route.ro_dst)->sin6_addr =
ip6->ip6_dst;
rtalloc_scoped((struct route *)&in6p->in6p_route, ip6oa.ip6oa_boundif);
inp_update_necp_policy(in6p, (struct sockaddr *)&from,
(struct sockaddr *)&to, ip6oa.ip6oa_boundif);
in6p->inp_policyresult.results.qos_marking_gencount = 0;
}
if (!necp_socket_is_allowed_to_send_recv_v6(in6p, 0, 0,
&ip6->ip6_src, &ip6->ip6_dst, NULL, 0, &policy_id, &route_rule_id, &skip_policy_id, &pass_flags)) {
error = EHOSTUNREACH;
goto bad;
}
necp_mark_packet_from_socket(m, in6p, policy_id, route_rule_id, skip_policy_id, pass_flags);
if (net_qos_policy_restricted != 0) {
necp_socket_update_qos_marking(in6p, in6p->in6p_route.ro_rt, route_rule_id);
}
}
#endif /* NECP */
if ((so->so_flags1 & SOF1_QOSMARKING_ALLOWED)) {
ip6oa.ip6oa_flags |= IP6OAF_QOSMARKING_ALLOWED;
}
#if IPSEC
if (in6p->in6p_sp != NULL && ipsec_setsocket(m, so) != 0) {
error = ENOBUFS;
goto bad;
}
#endif /*IPSEC*/
if (ROUTE_UNUSABLE(&in6p->in6p_route)) {
ROUTE_RELEASE(&in6p->in6p_route);
}
if (oifp != NULL) {
ifnet_release(oifp);
oifp = NULL;
}
set_packet_service_class(m, so, sotc, PKT_SCF_IPV6);
m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
m->m_pkthdr.pkt_flowid = in6p->inp_flowhash;
m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC |
PKTF_FLOW_RAWSOCK);
m->m_pkthdr.pkt_proto = in6p->in6p_ip6_nxt;
m->m_pkthdr.tx_rawip_pid = so->last_pid;
if (so->so_flags & SOF_DELEGATED) {
m->m_pkthdr.tx_rawip_e_pid = so->e_pid;
} else {
m->m_pkthdr.tx_rawip_e_pid = 0;
}
#if (DEBUG || DEVELOPMENT)
if (so->so_flags & SOF_MARK_WAKE_PKT) {
so->so_flags &= ~SOF_MARK_WAKE_PKT;
m->m_pkthdr.pkt_flags |= PKTF_WAKE_PKT;
}
#endif /* (DEBUG || DEVELOPMENT) */
if (im6o != NULL) {
IM6O_ADDREF(im6o);
}
error = ip6_output(m, optp, &in6p->in6p_route, flags, im6o,
&oifp, &ip6oa);
if (im6o != NULL) {
IM6O_REMREF(im6o);
}
if (in6p->in6p_route.ro_rt != NULL) {
struct rtentry *rt = in6p->in6p_route.ro_rt;
struct ifnet *outif;
if ((rt->rt_flags & RTF_MULTICAST) ||
in6p->in6p_socket == NULL ||
#if CONTENT_FILTER
/* Discard temporary route for cfil case */
cfil_faddr_use ||
#endif
!(in6p->in6p_socket->so_state & SS_ISCONNECTED)) {
rt = NULL; /* unusable */
}
/*
* Always discard the cached route for unconnected
* socket or if it is a multicast route.
*/
if (rt == NULL) {
ROUTE_RELEASE(&in6p->in6p_route);
}
/*
* If this is a connected socket and the destination
* route is not multicast, update outif with that of
* the route interface index used by IP.
*/
if (rt != NULL) {
/*
* When an NECP IP tunnel policy forces the outbound interface,
* ip6_output_list() informs the transport layer what is the actual
* outgoing interface
*/
if (ip6oa.ip6oa_flags & IP6OAF_BOUND_IF) {
outif = ifindex2ifnet[ip6oa.ip6oa_boundif];
} else {
outif = rt->rt_ifp;
}
if (outif != NULL) {
in6p->in6p_last_outifp = outif;
}
}
} else {
ROUTE_RELEASE(&in6p->in6p_route);
}
/*
* If output interface was cellular/expensive, and this socket is
* denied access to it, generate an event.
*/
if (error != 0 && (ip6oa.ip6oa_flags & IP6OAF_R_IFDENIED) &&
(INP_NO_CELLULAR(in6p) || INP_NO_EXPENSIVE(in6p) || INP_NO_CONSTRAINED(in6p))) {
soevent(in6p->inp_socket, (SO_FILT_HINT_LOCKED |
SO_FILT_HINT_IFDENIED));
}
if (SOCK_PROTO(so) == IPPROTO_ICMPV6) {
if (oifp) {
icmp6_ifoutstat_inc(oifp, type, code);
}
icmp6stat.icp6s_outhist[type]++;
} else {
rip6stat.rip6s_opackets++;
}
goto freectl;
bad:
if (m != NULL) {
m_freem(m);
}
freectl:
if (optp == &opt && optp->ip6po_rthdr) {
ROUTE_RELEASE(&optp->ip6po_route);
}
if (control != NULL) {
if (optp == &opt) {
ip6_clearpktopts(optp, -1);
}
m_freem(control);
}
if (oifp != NULL) {
ifnet_release(oifp);
}
#if CONTENT_FILTER
if (cfil_tag) {
m_tag_free(cfil_tag);
}
#endif
return error;
}
/*
* Raw IPv6 socket option processing.
*/
int
rip6_ctloutput(
struct socket *so,
struct sockopt *sopt)
{
int error, optval;
/* Allow <SOL_SOCKET,SO_FLUSH> at this level */
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 &&
!(sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_FLUSH)) {
return EINVAL;
}
error = 0;
switch (sopt->sopt_dir) {
case SOPT_GET:
switch (sopt->sopt_name) {
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 IPV6_CHECKSUM:
error = ip6_raw_ctloutput(so, sopt);
break;
case SO_FLUSH:
if ((error = sooptcopyin(sopt, &optval, sizeof(optval),
sizeof(optval))) != 0) {
break;
}
error = inp_flush(sotoinpcb(so), optval);
break;
default:
error = ip6_ctloutput(so, sopt);
break;
}
break;
}
return error;
}
static int
rip6_attach(struct socket *so, int proto, struct proc *p)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
if (inp) {
panic("rip6_attach");
}
if ((error = proc_suser(p)) != 0) {
return error;
}
error = soreserve(so, rip_sendspace, rip_recvspace);
if (error) {
return error;
}
error = in_pcballoc(so, &ripcbinfo, p);
if (error) {
return error;
}
inp = (struct inpcb *)so->so_pcb;
inp->inp_vflag |= INP_IPV6;
inp->in6p_ip6_nxt = (char)proto;
inp->in6p_hops = -1; /* use kernel default */
inp->in6p_cksum = -1;
inp->in6p_icmp6filt = kalloc_type(struct icmp6_filter,
Z_WAITOK | Z_NOFAIL);
ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt);
return 0;
}
static int
rip6_detach(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
if (inp == 0) {
panic("rip6_detach");
}
/* xxx: RSVP */
if (inp->in6p_icmp6filt) {
kfree_type(struct icmp6_filter, inp->in6p_icmp6filt);
inp->in6p_icmp6filt = NULL;
}
in6_pcbdetach(inp);
return 0;
}
static int
rip6_abort(struct socket *so)
{
soisdisconnected(so);
return rip6_detach(so);
}
static int
rip6_disconnect(struct socket *so)
{
struct inpcb *inp = sotoinpcb(so);
if ((so->so_state & SS_ISCONNECTED) == 0) {
return ENOTCONN;
}
inp->in6p_faddr = in6addr_any;
inp->inp_fifscope = IFSCOPE_NONE;
return rip6_abort(so);
}
static int
rip6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
#pragma unused(p)
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in6 sin6;
struct ifaddr *ifa = NULL;
struct ifnet *outif = NULL;
uint32_t ifscope = IFSCOPE_NONE;
int error;
if (inp == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(inp))
#endif /* NECP */
) {
return inp == NULL ? EINVAL : EPROTOTYPE;
}
if (nam->sa_len != sizeof(struct sockaddr_in6)) {
return EINVAL;
}
if (TAILQ_EMPTY(&ifnet_head) || SIN6(nam)->sin6_family != AF_INET6) {
return EADDRNOTAVAIL;
}
bzero(&sin6, sizeof(sin6));
*(&sin6) = *SIN6(nam);
if ((error = sa6_embedscope(&sin6, ip6_use_defzone, &ifscope)) != 0) {
return error;
}
/* Sanitize local copy for address searches */
sin6.sin6_flowinfo = 0;
sin6.sin6_port = 0;
if (in6_embedded_scope) {
sin6.sin6_scope_id = 0;
}
if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) &&
(ifa = ifa_ifwithaddr(SA(&sin6))) == 0) {
return EADDRNOTAVAIL;
}
if (ifa != NULL) {
IFA_LOCK(ifa);
if (((struct in6_ifaddr *)ifa)->ia6_flags &
(IN6_IFF_ANYCAST | IN6_IFF_NOTREADY | IN6_IFF_CLAT46 |
IN6_IFF_DETACHED | IN6_IFF_DEPRECATED)) {
IFA_UNLOCK(ifa);
ifa_remref(ifa);
return EADDRNOTAVAIL;
}
outif = ifa->ifa_ifp;
IFA_UNLOCK(ifa);
ifa_remref(ifa);
}
inp->in6p_laddr = sin6.sin6_addr;
inp->in6p_last_outifp = outif;
inp->inp_lifscope = ifscope;
in6_verify_ifscope(&inp->in6p_laddr, inp->inp_lifscope);
return 0;
}
static int
rip6_connect(struct socket *so, struct sockaddr *nam, __unused struct proc *p)
{
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)(void *)nam;
struct in6_addr *in6a = NULL;
struct in6_addr storage;
int error = 0;
#if ENABLE_DEFAULT_SCOPE
struct sockaddr_in6 tmp;
#endif
unsigned int ifscope;
struct ifnet *outif = NULL;
if (inp == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(inp))
#endif /* NECP */
) {
return inp == NULL ? EINVAL : EPROTOTYPE;
}
if (nam->sa_len != sizeof(*addr)) {
return EINVAL;
}
if (TAILQ_EMPTY(&ifnet_head)) {
return EADDRNOTAVAIL;
}
if (addr->sin6_family != AF_INET6) {
return EAFNOSUPPORT;
}
if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
so->so_flags1 |= SOF1_CONNECT_COUNTED;
INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_connected);
}
#if ENABLE_DEFAULT_SCOPE
if (addr->sin6_scope_id == 0) { /* not change if specified */
/* avoid overwrites */
tmp = *addr;
addr = &tmp;
addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr);
}
#endif
/* KAME hack: embed scopeid */
if (in6_embedscope(&SIN6(nam)->sin6_addr, SIN6(nam), inp, NULL, NULL, IN6_NULL_IF_EMBEDDED_SCOPE(&SIN6(nam)->sin6_scope_id)) != 0) {
return EINVAL;
}
ifscope = (inp->inp_flags & INP_BOUND_IF) ?
inp->inp_boundifp->if_index : IFSCOPE_NONE;
/* Source address selection. XXX: need pcblookup? */
struct ifnet *src_ifp = NULL;
in6a = in6_selectsrc(addr, inp->in6p_outputopts, inp, &inp->in6p_route,
&src_ifp, &storage, ifscope, &error);
if (src_ifp != NULL) {
if (in6a != NULL) {
inp->inp_lifscope = in6_addr2scopeid(src_ifp, in6a);
}
ifnet_release(src_ifp);
src_ifp = NULL;
}
if (IN6_IS_SCOPE_EMBED(&addr->sin6_addr) && inp->inp_lifscope == IFSCOPE_NONE) {
inp->inp_lifscope = addr->sin6_scope_id;
}
if (in6a == NULL) {
return error ? error : EADDRNOTAVAIL;
}
inp->in6p_laddr = *in6a;
inp->in6p_faddr = addr->sin6_addr;
if (inp->in6p_route.ro_rt != NULL) {
outif = inp->in6p_route.ro_rt->rt_ifp;
}
inp->in6p_last_outifp = outif;
in6_verify_ifscope(&inp->in6p_laddr, inp->inp_lifscope);
inp->inp_fifscope = addr->sin6_scope_id;
in6_verify_ifscope(&inp->in6p_faddr, inp->inp_fifscope);
soisconnected(so);
return 0;
}
static int
rip6_shutdown(struct socket *so)
{
socantsendmore(so);
return 0;
}
static int
rip6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct proc *p)
{
#pragma unused(flags, p)
struct inpcb *inp = sotoinpcb(so);
int error = 0;
if (inp == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(inp))
#endif /* NECP */
) {
if (inp == NULL) {
error = EINVAL;
} else {
error = EPROTOTYPE;
}
goto bad;
}
return rip6_output(m, so, SIN6(nam), control, 1);
bad:
VERIFY(error != 0);
if (m != NULL) {
m_freem(m);
}
if (control != NULL) {
m_freem(control);
}
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_sosend = sosend,
.pru_soreceive = soreceive,
};
__private_extern__ struct pr_usrreqs icmp6_dgram_usrreqs = {
.pru_abort = rip6_abort,
.pru_attach = icmp6_dgram_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 = icmp6_dgram_send,
.pru_shutdown = rip6_shutdown,
.pru_sockaddr = in6_getsockaddr,
.pru_sosend = sosend,
.pru_soreceive = soreceive,
};
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