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freebsd-dev/sys/netinet6/sctp6_usrreq.c
Michael Tuexen 2de2ae331b sctp: improve sctp_pathmtu_adjustment() 
Allow the resending of DATA chunks to be controlled by the caller,
which allows retiring sctp_mtu_size_reset() in a separate commit.
Also improve the computaion of the overhead and use 32-bit integers
consistently.
Thanks to Timo Voelker for pointing me to the code.

MFC after:	3 days
2021-12-30 15:16:05 +01:00

1224 lines
32 KiB
C
Raw Blame History

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) 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.
*
* c) Neither the name of Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <netinet/sctp_os.h>
#ifdef INET6
#include <sys/proc.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_var.h>
#include <netinet6/sctp6_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_auth.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_crc32.h>
#include <netinet/icmp6.h>
#include <netinet/udp.h>
int
sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
{
struct mbuf *m;
int iphlen;
uint32_t vrf_id;
uint8_t ecn_bits;
struct sockaddr_in6 src, dst;
struct ip6_hdr *ip6;
struct sctphdr *sh;
struct sctp_chunkhdr *ch;
int length, offset;
uint8_t compute_crc;
uint32_t mflowid;
uint8_t mflowtype;
uint16_t fibnum;
iphlen = *offp;
if (SCTP_GET_PKT_VRFID(*i_pak, vrf_id)) {
SCTP_RELEASE_PKT(*i_pak);
return (IPPROTO_DONE);
}
m = SCTP_HEADER_TO_CHAIN(*i_pak);
#ifdef SCTP_MBUF_LOGGING
/* Log in any input mbufs */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
sctp_log_mbc(m, SCTP_MBUF_INPUT);
}
#endif
#ifdef SCTP_PACKET_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
sctp_packet_log(m);
}
#endif
SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
"sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
m->m_pkthdr.len,
if_name(m->m_pkthdr.rcvif),
(int)m->m_pkthdr.csum_flags, CSUM_BITS);
mflowid = m->m_pkthdr.flowid;
mflowtype = M_HASHTYPE_GET(m);
fibnum = M_GETFIB(m);
SCTP_STAT_INCR(sctps_recvpackets);
SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
/* Get IP, SCTP, and first chunk header together in the first mbuf. */
offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
if (m->m_len < offset) {
m = m_pullup(m, offset);
if (m == NULL) {
SCTP_STAT_INCR(sctps_hdrops);
return (IPPROTO_DONE);
}
}
ip6 = mtod(m, struct ip6_hdr *);
sh = (struct sctphdr *)(mtod(m, caddr_t)+iphlen);
ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
offset -= sizeof(struct sctp_chunkhdr);
memset(&src, 0, sizeof(struct sockaddr_in6));
src.sin6_family = AF_INET6;
src.sin6_len = sizeof(struct sockaddr_in6);
src.sin6_port = sh->src_port;
src.sin6_addr = ip6->ip6_src;
if (in6_setscope(&src.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
goto out;
}
memset(&dst, 0, sizeof(struct sockaddr_in6));
dst.sin6_family = AF_INET6;
dst.sin6_len = sizeof(struct sockaddr_in6);
dst.sin6_port = sh->dest_port;
dst.sin6_addr = ip6->ip6_dst;
if (in6_setscope(&dst.sin6_addr, m->m_pkthdr.rcvif, NULL) != 0) {
goto out;
}
length = ntohs(ip6->ip6_plen) + iphlen;
/* Validate mbuf chain length with IP payload length. */
if (SCTP_HEADER_LEN(m) != length) {
SCTPDBG(SCTP_DEBUG_INPUT1,
"sctp6_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
SCTP_STAT_INCR(sctps_hdrops);
goto out;
}
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
goto out;
}
ecn_bits = IPV6_TRAFFIC_CLASS(ip6);
if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
SCTP_STAT_INCR(sctps_recvhwcrc);
compute_crc = 0;
} else {
SCTP_STAT_INCR(sctps_recvswcrc);
compute_crc = 1;
}
sctp_common_input_processing(&m, iphlen, offset, length,
(struct sockaddr *)&src,
(struct sockaddr *)&dst,
sh, ch,
compute_crc,
ecn_bits,
mflowtype, mflowid, fibnum,
vrf_id, port);
out:
if (m) {
sctp_m_freem(m);
}
return (IPPROTO_DONE);
}
int
sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
{
return (sctp6_input_with_port(i_pak, offp, 0));
}
void
sctp6_notify(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_nets *net,
uint8_t icmp6_type,
uint8_t icmp6_code,
uint32_t next_mtu)
{
int timer_stopped;
switch (icmp6_type) {
case ICMP6_DST_UNREACH:
if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
(icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
(icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
(icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
/* Mark the net unreachable. */
if (net->dest_state & SCTP_ADDR_REACHABLE) {
/* Ok that destination is not reachable */
net->dest_state &= ~SCTP_ADDR_REACHABLE;
net->dest_state &= ~SCTP_ADDR_PF;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
}
}
SCTP_TCB_UNLOCK(stcb);
break;
case ICMP6_PARAM_PROB:
/* Treat it like an ABORT. */
if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
sctp_abort_notification(stcb, true, false, 0, NULL, SCTP_SO_NOT_LOCKED);
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
} else {
SCTP_TCB_UNLOCK(stcb);
}
break;
case ICMP6_PACKET_TOO_BIG:
if (net->dest_state & SCTP_ADDR_NO_PMTUD) {
SCTP_TCB_UNLOCK(stcb);
break;
}
if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
timer_stopped = 1;
sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
} else {
timer_stopped = 0;
}
/* Update the path MTU. */
if (net->port) {
next_mtu -= sizeof(struct udphdr);
}
if (net->mtu > next_mtu) {
net->mtu = next_mtu;
if (net->port) {
sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu + sizeof(struct udphdr));
} else {
sctp_hc_set_mtu(&net->ro._l_addr, inp->fibnum, next_mtu);
}
}
/* Update the association MTU */
if (stcb->asoc.smallest_mtu > next_mtu) {
sctp_pathmtu_adjustment(stcb, next_mtu, true);
}
/* Finally, start the PMTU timer if it was running before. */
if (timer_stopped) {
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
}
SCTP_TCB_UNLOCK(stcb);
break;
default:
SCTP_TCB_UNLOCK(stcb);
break;
}
}
void
sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
{
struct ip6ctlparam *ip6cp;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
struct sctp_nets *net;
struct sctphdr sh;
struct sockaddr_in6 src, dst;
if (pktdst->sa_family != AF_INET6 ||
pktdst->sa_len != sizeof(struct sockaddr_in6)) {
return;
}
if ((unsigned)cmd >= PRC_NCMDS) {
return;
}
if (PRC_IS_REDIRECT(cmd)) {
d = NULL;
} else if (inet6ctlerrmap[cmd] == 0) {
return;
}
/* If the parameter is from icmp6, decode it. */
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
} else {
ip6cp = (struct ip6ctlparam *)NULL;
}
if (ip6cp != NULL) {
/*
* XXX: We assume that when IPV6 is non NULL, M and OFF are
* valid.
*/
if (ip6cp->ip6c_m == NULL) {
return;
}
/*
* Check if we can safely examine the ports and the
* verification tag of the SCTP common header.
*/
if (ip6cp->ip6c_m->m_pkthdr.len <
(int32_t)(ip6cp->ip6c_off + offsetof(struct sctphdr, checksum))) {
return;
}
/* Copy out the port numbers and the verification tag. */
memset(&sh, 0, sizeof(sh));
m_copydata(ip6cp->ip6c_m,
ip6cp->ip6c_off,
sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
(caddr_t)&sh);
memset(&src, 0, sizeof(struct sockaddr_in6));
src.sin6_family = AF_INET6;
src.sin6_len = sizeof(struct sockaddr_in6);
src.sin6_port = sh.src_port;
src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
return;
}
memset(&dst, 0, sizeof(struct sockaddr_in6));
dst.sin6_family = AF_INET6;
dst.sin6_len = sizeof(struct sockaddr_in6);
dst.sin6_port = sh.dest_port;
dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
return;
}
inp = NULL;
net = NULL;
stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
(struct sockaddr *)&src,
&inp, &net, 1, SCTP_DEFAULT_VRFID);
if ((stcb != NULL) &&
(net != NULL) &&
(inp != NULL)) {
/* Check the verification tag */
if (ntohl(sh.v_tag) != 0) {
/*
* This must be the verification tag used
* for sending out packets. We don't
* consider packets reflecting the
* verification tag.
*/
if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
SCTP_TCB_UNLOCK(stcb);
return;
}
} else {
if (ip6cp->ip6c_m->m_pkthdr.len >=
ip6cp->ip6c_off + sizeof(struct sctphdr) +
sizeof(struct sctp_chunkhdr) +
offsetof(struct sctp_init, a_rwnd)) {
/*
* In this case we can check if we
* got an INIT chunk and if the
* initiate tag matches.
*/
uint32_t initiate_tag;
uint8_t chunk_type;
m_copydata(ip6cp->ip6c_m,
ip6cp->ip6c_off +
sizeof(struct sctphdr),
sizeof(uint8_t),
(caddr_t)&chunk_type);
m_copydata(ip6cp->ip6c_m,
ip6cp->ip6c_off +
sizeof(struct sctphdr) +
sizeof(struct sctp_chunkhdr),
sizeof(uint32_t),
(caddr_t)&initiate_tag);
if ((chunk_type != SCTP_INITIATION) ||
(ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
SCTP_TCB_UNLOCK(stcb);
return;
}
} else {
SCTP_TCB_UNLOCK(stcb);
return;
}
}
sctp6_notify(inp, stcb, net,
ip6cp->ip6c_icmp6->icmp6_type,
ip6cp->ip6c_icmp6->icmp6_code,
ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
} else {
if ((stcb == NULL) && (inp != NULL)) {
/* reduce inp's ref-count */
SCTP_INP_WLOCK(inp);
SCTP_INP_DECR_REF(inp);
SCTP_INP_WUNLOCK(inp);
}
if (stcb) {
SCTP_TCB_UNLOCK(stcb);
}
}
}
}
/*
* this routine can probably be collasped into the one in sctp_userreq.c
* since they do the same thing and now we lookup with a sockaddr
*/
static int
sctp6_getcred(SYSCTL_HANDLER_ARGS)
{
struct xucred xuc;
struct sockaddr_in6 addrs[2];
struct sctp_inpcb *inp;
struct sctp_nets *net;
struct sctp_tcb *stcb;
int error;
uint32_t vrf_id;
vrf_id = SCTP_DEFAULT_VRFID;
error = priv_check(req->td, PRIV_NETINET_GETCRED);
if (error)
return (error);
if (req->newlen != sizeof(addrs)) {
SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
if (req->oldlen != sizeof(struct ucred)) {
SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
error = SYSCTL_IN(req, addrs, sizeof(addrs));
if (error)
return (error);
stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[1]),
sin6tosa(&addrs[0]),
&inp, &net, 1, vrf_id);
if (stcb == NULL || inp == NULL || inp->sctp_socket == NULL) {
if ((inp != NULL) && (stcb == NULL)) {
/* reduce ref-count */
SCTP_INP_WLOCK(inp);
SCTP_INP_DECR_REF(inp);
goto cred_can_cont;
}
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
error = ENOENT;
goto out;
}
SCTP_TCB_UNLOCK(stcb);
/*
* We use the write lock here, only since in the error leg we need
* it. If we used RLOCK, then we would have to
* wlock/decr/unlock/rlock. Which in theory could create a hole.
* Better to use higher wlock.
*/
SCTP_INP_WLOCK(inp);
cred_can_cont:
error = cr_canseesocket(req->td->td_ucred, inp->sctp_socket);
if (error) {
SCTP_INP_WUNLOCK(inp);
goto out;
}
cru2x(inp->sctp_socket->so_cred, &xuc);
SCTP_INP_WUNLOCK(inp);
error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
out:
return (error);
}
SYSCTL_PROC(_net_inet6_sctp6, OID_AUTO, getcred,
CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
0, 0, sctp6_getcred, "S,ucred",
"Get the ucred of a SCTP6 connection");
/* This is the same as the sctp_abort() could be made common */
static void
sctp6_abort(struct socket *so)
{
struct epoch_tracker et;
struct sctp_inpcb *inp;
uint32_t flags;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return;
}
NET_EPOCH_ENTER(et);
sctp_must_try_again:
flags = inp->sctp_flags;
#ifdef SCTP_LOG_CLOSING
sctp_log_closing(inp, NULL, 17);
#endif
if (((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
(atomic_cmpset_int(&inp->sctp_flags, flags, (flags | SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_CLOSE_IP)))) {
#ifdef SCTP_LOG_CLOSING
sctp_log_closing(inp, NULL, 16);
#endif
sctp_inpcb_free(inp, SCTP_FREE_SHOULD_USE_ABORT,
SCTP_CALLED_AFTER_CMPSET_OFCLOSE);
SOCK_LOCK(so);
SCTP_SB_CLEAR(so->so_snd);
/*
* same for the rcv ones, they are only here for the
* accounting/select.
*/
SCTP_SB_CLEAR(so->so_rcv);
/* Now null out the reference, we are completely detached. */
so->so_pcb = NULL;
SOCK_UNLOCK(so);
} else {
flags = inp->sctp_flags;
if ((flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) {
goto sctp_must_try_again;
}
}
NET_EPOCH_EXIT(et);
return;
}
static int
sctp6_attach(struct socket *so, int proto SCTP_UNUSED, struct thread *p SCTP_UNUSED)
{
int error;
struct sctp_inpcb *inp;
uint32_t vrf_id = SCTP_DEFAULT_VRFID;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp != NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
error = SCTP_SORESERVE(so, SCTP_BASE_SYSCTL(sctp_sendspace), SCTP_BASE_SYSCTL(sctp_recvspace));
if (error)
return (error);
}
error = sctp_inpcb_alloc(so, vrf_id);
if (error)
return (error);
inp = (struct sctp_inpcb *)so->so_pcb;
SCTP_INP_WLOCK(inp);
inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */
inp->ip_inp.inp.inp_vflag |= INP_IPV6;
inp->ip_inp.inp.in6p_hops = -1; /* use kernel default */
inp->ip_inp.inp.in6p_cksum = -1; /* just to be sure */
#ifdef INET
/*
* XXX: ugly!! IPv4 TTL initialization is necessary for an IPv6
* socket as well, because the socket may be bound to an IPv6
* wildcard address, which may match an IPv4-mapped IPv6 address.
*/
inp->ip_inp.inp.inp_ip_ttl = MODULE_GLOBAL(ip_defttl);
#endif
SCTP_INP_WUNLOCK(inp);
return (0);
}
static int
sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
{
struct sctp_inpcb *inp;
int error;
u_char vflagsav;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
if (addr) {
switch (addr->sa_family) {
#ifdef INET
case AF_INET:
if (addr->sa_len != sizeof(struct sockaddr_in)) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (addr->sa_len != sizeof(struct sockaddr_in6)) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
break;
#endif
default:
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
}
vflagsav = inp->ip_inp.inp.inp_vflag;
inp->ip_inp.inp.inp_vflag &= ~INP_IPV4;
inp->ip_inp.inp.inp_vflag |= INP_IPV6;
if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp) == 0)) {
switch (addr->sa_family) {
#ifdef INET
case AF_INET:
/* binding v4 addr to v6 socket, so reset flags */
inp->ip_inp.inp.inp_vflag |= INP_IPV4;
inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
break;
#endif
#ifdef INET6
case AF_INET6:
{
struct sockaddr_in6 *sin6_p;
sin6_p = (struct sockaddr_in6 *)addr;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
inp->ip_inp.inp.inp_vflag |= INP_IPV4;
}
#ifdef INET
if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6_p);
inp->ip_inp.inp.inp_vflag |= INP_IPV4;
inp->ip_inp.inp.inp_vflag &= ~INP_IPV6;
error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, NULL, p);
goto out;
}
#endif
break;
}
#endif
default:
break;
}
} else if (addr != NULL) {
struct sockaddr_in6 *sin6_p;
/* IPV6_V6ONLY socket */
#ifdef INET
if (addr->sa_family == AF_INET) {
/* can't bind v4 addr to v6 only socket! */
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
error = EINVAL;
goto out;
}
#endif
sin6_p = (struct sockaddr_in6 *)addr;
if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
/* can't bind v4-mapped addrs either! */
/* NOTE: we don't support SIIT */
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
error = EINVAL;
goto out;
}
}
error = sctp_inpcb_bind(so, addr, NULL, p);
out:
if (error != 0)
inp->ip_inp.inp.inp_vflag = vflagsav;
return (error);
}
static void
sctp6_close(struct socket *so)
{
sctp_close(so);
}
/* This could be made common with sctp_detach() since they are identical */
static
int
sctp6_disconnect(struct socket *so)
{
return (sctp_disconnect(so));
}
int
sctp_sendm(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct thread *p);
static int
sctp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct thread *p)
{
struct sctp_inpcb *inp;
#ifdef INET
struct sockaddr_in6 *sin6;
#endif /* INET */
/* No SPL needed since sctp_output does this */
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
if (control) {
SCTP_RELEASE_PKT(control);
control = NULL;
}
SCTP_RELEASE_PKT(m);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
/*
* For the TCP model we may get a NULL addr, if we are a connected
* socket thats ok.
*/
if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) &&
(addr == NULL)) {
goto connected_type;
}
if (addr == NULL) {
SCTP_RELEASE_PKT(m);
if (control) {
SCTP_RELEASE_PKT(control);
control = NULL;
}
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EDESTADDRREQ);
return (EDESTADDRREQ);
}
switch (addr->sa_family) {
#ifdef INET
case AF_INET:
if (addr->sa_len != sizeof(struct sockaddr_in)) {
if (control) {
SCTP_RELEASE_PKT(control);
control = NULL;
}
SCTP_RELEASE_PKT(m);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (addr->sa_len != sizeof(struct sockaddr_in6)) {
if (control) {
SCTP_RELEASE_PKT(control);
control = NULL;
}
SCTP_RELEASE_PKT(m);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
break;
#endif
default:
if (control) {
SCTP_RELEASE_PKT(control);
control = NULL;
}
SCTP_RELEASE_PKT(m);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
#ifdef INET
sin6 = (struct sockaddr_in6 *)addr;
if (SCTP_IPV6_V6ONLY(inp)) {
/*
* if IPV6_V6ONLY flag, we discard datagrams destined to a
* v4 addr or v4-mapped addr
*/
if (addr->sa_family == AF_INET) {
if (control) {
SCTP_RELEASE_PKT(control);
control = NULL;
}
SCTP_RELEASE_PKT(m);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
if (control) {
SCTP_RELEASE_PKT(control);
control = NULL;
}
SCTP_RELEASE_PKT(m);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
}
if ((addr->sa_family == AF_INET6) &&
IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
/* convert v4-mapped into v4 addr and send */
in6_sin6_2_sin(&sin, sin6);
return (sctp_sendm(so, flags, m, (struct sockaddr *)&sin, control, p));
}
#endif /* INET */
connected_type:
/* now what about control */
if (control) {
if (inp->control) {
SCTP_PRINTF("huh? control set?\n");
SCTP_RELEASE_PKT(inp->control);
inp->control = NULL;
}
inp->control = control;
}
/* Place the data */
if (inp->pkt) {
SCTP_BUF_NEXT(inp->pkt_last) = m;
inp->pkt_last = m;
} else {
inp->pkt_last = inp->pkt = m;
}
if (
/* FreeBSD and MacOSX uses a flag passed */
((flags & PRUS_MORETOCOME) == 0)
) {
/*
* note with the current version this code will only be used
* by OpenBSD, NetBSD and FreeBSD have methods for
* re-defining sosend() to use sctp_sosend(). One can
* optionaly switch back to this code (by changing back the
* defininitions but this is not advisable.
*/
struct epoch_tracker et;
int ret;
NET_EPOCH_ENTER(et);
ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
NET_EPOCH_EXIT(et);
inp->pkt = NULL;
inp->control = NULL;
return (ret);
} else {
return (0);
}
}
static int
sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
{
struct epoch_tracker et;
uint32_t vrf_id;
int error = 0;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
#ifdef INET
struct sockaddr_in6 *sin6;
union sctp_sockstore store;
#endif
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
return (ECONNRESET); /* I made the same as TCP since we are
* not setup? */
}
if (addr == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
switch (addr->sa_family) {
#ifdef INET
case AF_INET:
if (addr->sa_len != sizeof(struct sockaddr_in)) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
break;
#endif
#ifdef INET6
case AF_INET6:
if (addr->sa_len != sizeof(struct sockaddr_in6)) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
break;
#endif
default:
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
vrf_id = inp->def_vrf_id;
SCTP_ASOC_CREATE_LOCK(inp);
SCTP_INP_RLOCK(inp);
if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) ==
SCTP_PCB_FLAGS_UNBOUND) {
/* Bind a ephemeral port */
SCTP_INP_RUNLOCK(inp);
error = sctp6_bind(so, NULL, p);
if (error) {
SCTP_ASOC_CREATE_UNLOCK(inp);
return (error);
}
SCTP_INP_RLOCK(inp);
}
if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
(inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
/* We are already connected AND the TCP model */
SCTP_INP_RUNLOCK(inp);
SCTP_ASOC_CREATE_UNLOCK(inp);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EADDRINUSE);
return (EADDRINUSE);
}
#ifdef INET
sin6 = (struct sockaddr_in6 *)addr;
if (SCTP_IPV6_V6ONLY(inp)) {
/*
* if IPV6_V6ONLY flag, ignore connections destined to a v4
* addr or v4-mapped addr
*/
if (addr->sa_family == AF_INET) {
SCTP_INP_RUNLOCK(inp);
SCTP_ASOC_CREATE_UNLOCK(inp);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
SCTP_INP_RUNLOCK(inp);
SCTP_ASOC_CREATE_UNLOCK(inp);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
}
if ((addr->sa_family == AF_INET6) &&
IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
/* convert v4-mapped into v4 addr */
in6_sin6_2_sin(&store.sin, sin6);
addr = &store.sa;
}
#endif /* INET */
/* Now do we connect? */
if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
stcb = LIST_FIRST(&inp->sctp_asoc_list);
if (stcb) {
SCTP_TCB_LOCK(stcb);
}
SCTP_INP_RUNLOCK(inp);
} else {
SCTP_INP_RUNLOCK(inp);
SCTP_INP_WLOCK(inp);
SCTP_INP_INCR_REF(inp);
SCTP_INP_WUNLOCK(inp);
stcb = sctp_findassociation_ep_addr(&inp, addr, NULL, NULL, NULL);
if (stcb == NULL) {
SCTP_INP_WLOCK(inp);
SCTP_INP_DECR_REF(inp);
SCTP_INP_WUNLOCK(inp);
}
}
if (stcb != NULL) {
/* Already have or am bring up an association */
SCTP_ASOC_CREATE_UNLOCK(inp);
SCTP_TCB_UNLOCK(stcb);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EALREADY);
return (EALREADY);
}
/* We are GOOD to go */
stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
inp->sctp_ep.pre_open_stream_count,
inp->sctp_ep.port, p,
SCTP_INITIALIZE_AUTH_PARAMS);
SCTP_ASOC_CREATE_UNLOCK(inp);
if (stcb == NULL) {
/* Gak! no memory */
return (error);
}
SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
NET_EPOCH_ENTER(et);
sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
SCTP_TCB_UNLOCK(stcb);
NET_EPOCH_EXIT(et);
return (error);
}
static int
sctp6_getaddr(struct socket *so, struct sockaddr **addr)
{
struct sockaddr_in6 *sin6;
struct sctp_inpcb *inp;
uint32_t vrf_id;
struct sctp_ifa *sctp_ifa;
int error;
/*
* Do the malloc first in case it blocks.
*/
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof(*sin6));
if (sin6 == NULL)
return (ENOMEM);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
SCTP_FREE_SONAME(sin6);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
return (ECONNRESET);
}
SCTP_INP_RLOCK(inp);
sin6->sin6_port = inp->sctp_lport;
if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
/* For the bound all case you get back 0 */
if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
struct sctp_tcb *stcb;
struct sockaddr_in6 *sin_a6;
struct sctp_nets *net;
int fnd;
stcb = LIST_FIRST(&inp->sctp_asoc_list);
if (stcb == NULL) {
SCTP_INP_RUNLOCK(inp);
SCTP_FREE_SONAME(sin6);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
return (ENOENT);
}
fnd = 0;
sin_a6 = NULL;
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
if (sin_a6 == NULL)
/* this will make coverity happy */
continue;
if (sin_a6->sin6_family == AF_INET6) {
fnd = 1;
break;
}
}
if ((!fnd) || (sin_a6 == NULL)) {
/* punt */
SCTP_INP_RUNLOCK(inp);
SCTP_FREE_SONAME(sin6);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
return (ENOENT);
}
vrf_id = inp->def_vrf_id;
sctp_ifa = sctp_source_address_selection(inp, stcb, (sctp_route_t *)&net->ro, net, 0, vrf_id);
if (sctp_ifa) {
sin6->sin6_addr = sctp_ifa->address.sin6.sin6_addr;
}
} else {
/* For the bound all case you get back 0 */
memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
}
} else {
/* Take the first IPv6 address in the list */
struct sctp_laddr *laddr;
int fnd = 0;
LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
if (laddr->ifa->address.sa.sa_family == AF_INET6) {
struct sockaddr_in6 *sin_a;
sin_a = &laddr->ifa->address.sin6;
sin6->sin6_addr = sin_a->sin6_addr;
fnd = 1;
break;
}
}
if (!fnd) {
SCTP_FREE_SONAME(sin6);
SCTP_INP_RUNLOCK(inp);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
return (ENOENT);
}
}
SCTP_INP_RUNLOCK(inp);
/* Scoping things for v6 */
if ((error = sa6_recoverscope(sin6)) != 0) {
SCTP_FREE_SONAME(sin6);
return (error);
}
(*addr) = (struct sockaddr *)sin6;
return (0);
}
static int
sctp6_peeraddr(struct socket *so, struct sockaddr **addr)
{
struct sockaddr_in6 *sin6;
int fnd;
struct sockaddr_in6 *sin_a6;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
struct sctp_nets *net;
int error;
/* Do the malloc first in case it blocks. */
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
if (sin6 == NULL)
return (ENOMEM);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
inp = (struct sctp_inpcb *)so->so_pcb;
if ((inp == NULL) ||
((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
/* UDP type and listeners will drop out here */
SCTP_FREE_SONAME(sin6);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOTCONN);
return (ENOTCONN);
}
SCTP_INP_RLOCK(inp);
stcb = LIST_FIRST(&inp->sctp_asoc_list);
if (stcb) {
SCTP_TCB_LOCK(stcb);
}
SCTP_INP_RUNLOCK(inp);
if (stcb == NULL) {
SCTP_FREE_SONAME(sin6);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ECONNRESET);
return (ECONNRESET);
}
fnd = 0;
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
sin_a6 = (struct sockaddr_in6 *)&net->ro._l_addr;
if (sin_a6->sin6_family == AF_INET6) {
fnd = 1;
sin6->sin6_port = stcb->rport;
sin6->sin6_addr = sin_a6->sin6_addr;
break;
}
}
SCTP_TCB_UNLOCK(stcb);
if (!fnd) {
/* No IPv4 address */
SCTP_FREE_SONAME(sin6);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, ENOENT);
return (ENOENT);
}
if ((error = sa6_recoverscope(sin6)) != 0) {
SCTP_FREE_SONAME(sin6);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, error);
return (error);
}
*addr = (struct sockaddr *)sin6;
return (0);
}
static int
sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp = sotoinpcb(so);
int error;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
/* allow v6 addresses precedence */
error = sctp6_getaddr(so, nam);
#ifdef INET
if (error) {
struct sockaddr_in6 *sin6;
/* try v4 next if v6 failed */
error = sctp_ingetaddr(so, nam);
if (error) {
return (error);
}
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
if (sin6 == NULL) {
SCTP_FREE_SONAME(*nam);
return (ENOMEM);
}
in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
SCTP_FREE_SONAME(*nam);
*nam = (struct sockaddr *)sin6;
}
#endif
return (error);
}
static int
sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp = sotoinpcb(so);
int error;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP6_USRREQ, EINVAL);
return (EINVAL);
}
/* allow v6 addresses precedence */
error = sctp6_peeraddr(so, nam);
#ifdef INET
if (error) {
struct sockaddr_in6 *sin6;
/* try v4 next if v6 failed */
error = sctp_peeraddr(so, nam);
if (error) {
return (error);
}
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
if (sin6 == NULL) {
SCTP_FREE_SONAME(*nam);
return (ENOMEM);
}
in6_sin_2_v4mapsin6((struct sockaddr_in *)*nam, sin6);
SCTP_FREE_SONAME(*nam);
*nam = (struct sockaddr *)sin6;
}
#endif
return (error);
}
struct pr_usrreqs sctp6_usrreqs = {
.pru_abort = sctp6_abort,
.pru_accept = sctp_accept,
.pru_attach = sctp6_attach,
.pru_bind = sctp6_bind,
.pru_connect = sctp6_connect,
.pru_control = in6_control,
.pru_close = sctp6_close,
.pru_detach = sctp6_close,
.pru_sopoll = sopoll_generic,
.pru_flush = sctp_flush,
.pru_disconnect = sctp6_disconnect,
.pru_listen = sctp_listen,
.pru_peeraddr = sctp6_getpeeraddr,
.pru_send = sctp6_send,
.pru_shutdown = sctp_shutdown,
.pru_sockaddr = sctp6_in6getaddr,
.pru_sosend = sctp_sosend,
.pru_soreceive = sctp_soreceive
};
#endif
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