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freebsd-skq/sys/netinet6/sctp6_usrreq.c
rrs 1b181171ae - most all includes (#include <>) migrate to the sctp_os_bsd.h file 
- Finally all splxx() are removed
 - Count error fixed in mapping array which might
   cause a wrong cumack generation.
 - Invariants around panic for case D + printf when no invariants.
 - one-to-one model race condition fixed by using
   a pre-formed connection and then completing the
   work so accept won't happen on a non-formed
   association.
 - Some additional paranoia checks in sctp_output.
 - Locks that were missing in the accept code.

Approved by:	gnn
2007-01-18 09:58:43 +00:00

1297 lines
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/*-
* Copyright (c) 2001-2006, Cisco Systems, Inc. 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.
*/
/* $KAME: sctp6_usrreq.c,v 1.38 2005/08/24 08:08:56 suz Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <netinet/sctp_os.h>
#include <sys/proc.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_input.h>
#include <netinet/sctp_bsd_addr.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_indata.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_auth.h>
#include <netinet6/sctp6_var.h>
#ifdef SCTP_DEBUG
extern uint32_t sctp_debug_on;
#endif /* SCTP_DEBUG */
extern struct protosw inetsw[];
extern int sctp_no_csum_on_loopback;
int
sctp6_input(mp, offp, proto)
struct mbuf **mp;
int *offp;
int proto;
{
struct mbuf *m;
struct ip6_hdr *ip6;
struct sctphdr *sh;
struct sctp_inpcb *in6p = NULL;
struct sctp_nets *net;
int refcount_up = 0;
u_int32_t check, calc_check;
struct inpcb *in6p_ip;
struct sctp_chunkhdr *ch;
int length, mlen, offset, iphlen;
u_int8_t ecn_bits;
struct sctp_tcb *stcb = NULL;
int off = *offp;
m = SCTP_HEADER_TO_CHAIN(*mp);
ip6 = mtod(m, struct ip6_hdr *);
#ifndef PULLDOWN_TEST
/* If PULLDOWN_TEST off, must be in a single mbuf. */
IP6_EXTHDR_CHECK(m, off, (int)(sizeof(*sh) + sizeof(*ch)), IPPROTO_DONE);
sh = (struct sctphdr *)((caddr_t)ip6 + off);
ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh));
#else
/* Ensure that (sctphdr + sctp_chunkhdr) in a row. */
IP6_EXTHDR_GET(sh, struct sctphdr *, m, off, sizeof(*sh) + sizeof(*ch));
if (sh == NULL) {
SCTP_STAT_INCR(sctps_hdrops);
return IPPROTO_DONE;
}
ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
#endif
iphlen = off;
offset = iphlen + sizeof(*sh) + sizeof(*ch);
#if defined(NFAITH) && NFAITH > 0
if (faithprefix_p != NULL && (*faithprefix_p) (&ip6->ip6_dst)) {
/* XXX send icmp6 host/port unreach? */
goto bad;
}
#endif /* NFAITH defined and > 0 */
SCTP_STAT_INCR(sctps_recvpackets);
SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
printf("V6 input gets a packet iphlen:%d pktlen:%d\n", iphlen, SCTP_HEADER_LEN((*mp)));
}
#endif
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
/* No multi-cast support in SCTP */
goto bad;
}
/* destination port of 0 is illegal, based on RFC2960. */
if (sh->dest_port == 0)
goto bad;
if ((sctp_no_csum_on_loopback == 0) ||
(!SCTP_IS_IT_LOOPBACK(m))) {
/*
* we do NOT validate things from the loopback if the sysctl
* is set to 1.
*/
check = sh->checksum; /* save incoming checksum */
if ((check == 0) && (sctp_no_csum_on_loopback)) {
/*
* special hook for where we got a local address
* somehow routed across a non IFT_LOOP type
* interface
*/
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &ip6->ip6_dst))
goto sctp_skip_csum;
}
sh->checksum = 0; /* prepare for calc */
calc_check = sctp_calculate_sum(m, &mlen, iphlen);
if (calc_check != check) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_INPUT1) {
printf("Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
calc_check, check, m,
mlen, iphlen);
}
#endif
stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
sh, ch, &in6p, &net);
/* in6p's ref-count increased && stcb locked */
if ((in6p) && (stcb)) {
sctp_send_packet_dropped(stcb, net, m, iphlen, 1);
sctp_chunk_output((struct sctp_inpcb *)in6p, stcb, 2);
} else if ((in6p != NULL) && (stcb == NULL)) {
refcount_up = 1;
}
SCTP_STAT_INCR(sctps_badsum);
SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
goto bad;
}
sh->checksum = calc_check;
}
sctp_skip_csum:
net = NULL;
/*
* Locate pcb and tcb for datagram sctp_findassociation_addr() wants
* IP/SCTP/first chunk header...
*/
stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch),
sh, ch, &in6p, &net);
/* in6p's ref-count increased */
if (in6p == NULL) {
struct sctp_init_chunk *init_chk, chunk_buf;
SCTP_STAT_INCR(sctps_noport);
if (ch->chunk_type == SCTP_INITIATION) {
/*
* we do a trick here to get the INIT tag, dig in
* and get the tag from the INIT and put it in the
* common header.
*/
init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
iphlen + sizeof(*sh), sizeof(*init_chk),
(u_int8_t *) & chunk_buf);
sh->v_tag = init_chk->init.initiate_tag;
}
if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
sctp_send_shutdown_complete2(m, iphlen, sh);
goto bad;
}
if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
goto bad;
}
if (ch->chunk_type != SCTP_ABORT_ASSOCIATION)
sctp_send_abort(m, iphlen, sh, 0, NULL);
goto bad;
} else if (stcb == NULL) {
refcount_up = 1;
}
in6p_ip = (struct inpcb *)in6p;
#ifdef IPSEC
/*
* Check AH/ESP integrity.
*/
if (in6p_ip && (ipsec6_in_reject(m, in6p_ip))) {
/* XXX */
ipsec6stat.in_polvio++;
goto bad;
}
#endif /* IPSEC */
/*
* CONTROL chunk processing
*/
offset -= sizeof(*ch);
ecn_bits = ((ntohl(ip6->ip6_flow) >> 20) & 0x000000ff);
/* Length now holds the total packet length payload + iphlen */
length = ntohs(ip6->ip6_plen) + iphlen;
(void)sctp_common_input_processing(&m, iphlen, offset, length, sh, ch,
in6p, stcb, net, ecn_bits);
/* inp's ref-count reduced && stcb unlocked */
/* XXX this stuff below gets moved to appropriate parts later... */
if (m)
m_freem(m);
if ((in6p) && refcount_up) {
/* reduce ref-count */
SCTP_INP_WLOCK(in6p);
SCTP_INP_DECR_REF(in6p);
SCTP_INP_WUNLOCK(in6p);
}
return IPPROTO_DONE;
bad:
if (stcb)
SCTP_TCB_UNLOCK(stcb);
if ((in6p) && refcount_up) {
/* reduce ref-count */
SCTP_INP_WLOCK(in6p);
SCTP_INP_DECR_REF(in6p);
SCTP_INP_WUNLOCK(in6p);
}
if (m)
m_freem(m);
return IPPROTO_DONE;
}
static void
sctp6_notify_mbuf(struct sctp_inpcb *inp,
struct icmp6_hdr *icmp6,
struct sctphdr *sh,
struct sctp_tcb *stcb,
struct sctp_nets *net)
{
u_int32_t nxtsz;
if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
(icmp6 == NULL) || (sh == NULL)) {
goto out;
}
/* First do we even look at it? */
if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
goto out;
if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
/* not PACKET TO BIG */
goto out;
}
/*
* ok we need to look closely. We could even get smarter and look at
* anyone that we sent to in case we get a different ICMP that tells
* us there is no way to reach a host, but for this impl, all we
* care about is MTU discovery.
*/
nxtsz = ntohl(icmp6->icmp6_mtu);
/* Stop any PMTU timer */
sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL, SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
/* Adjust destination size limit */
if (net->mtu > nxtsz) {
net->mtu = nxtsz;
}
/* now what about the ep? */
if (stcb->asoc.smallest_mtu > nxtsz) {
struct sctp_tmit_chunk *chk;
/* Adjust that too */
stcb->asoc.smallest_mtu = nxtsz;
/* now off to subtract IP_DF flag if needed */
TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
if ((u_int32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
}
}
TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
if ((u_int32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
/*
* For this guy we also mark for immediate
* resend since we sent to big of chunk
*/
chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
if (chk->sent != SCTP_DATAGRAM_RESEND)
stcb->asoc.sent_queue_retran_cnt++;
chk->sent = SCTP_DATAGRAM_RESEND;
chk->rec.data.doing_fast_retransmit = 0;
chk->sent = SCTP_DATAGRAM_RESEND;
/* Clear any time so NO RTT is being done */
chk->sent_rcv_time.tv_sec = 0;
chk->sent_rcv_time.tv_usec = 0;
stcb->asoc.total_flight -= chk->send_size;
net->flight_size -= chk->send_size;
}
}
}
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
out:
if (stcb)
SCTP_TCB_UNLOCK(stcb);
}
void
sctp6_ctlinput(cmd, pktdst, d)
int cmd;
struct sockaddr *pktdst;
void *d;
{
struct sctphdr sh;
struct ip6ctlparam *ip6cp = NULL;
int cm;
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) {
/*
* XXX: We assume that when IPV6 is non NULL, M and OFF are
* valid.
*/
/* check if we can safely examine src and dst ports */
struct sctp_inpcb *inp = NULL;
struct sctp_tcb *stcb = NULL;
struct sctp_nets *net = NULL;
struct sockaddr_in6 final;
if (ip6cp->ip6c_m == NULL)
return;
bzero(&sh, sizeof(sh));
bzero(&final, sizeof(final));
inp = NULL;
net = NULL;
m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
(caddr_t)&sh);
ip6cp->ip6c_src->sin6_port = sh.src_port;
final.sin6_len = sizeof(final);
final.sin6_family = AF_INET6;
final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
final.sin6_port = sh.dest_port;
stcb = sctp_findassociation_addr_sa((struct sockaddr *)ip6cp->ip6c_src,
(struct sockaddr *)&final,
&inp, &net, 1);
/* inp's ref-count increased && stcb locked */
if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
if (cmd == PRC_MSGSIZE) {
sctp6_notify_mbuf(inp,
ip6cp->ip6c_icmp6,
&sh,
stcb,
net);
/* inp's ref-count reduced && stcb unlocked */
} else {
if (cmd == PRC_HOSTDEAD) {
cm = EHOSTUNREACH;
} else {
cm = inet6ctlerrmap[cmd];
}
sctp_notify(inp, cm, &sh,
(struct sockaddr *)&final,
stcb, net);
/* inp's ref-count reduced && stcb unlocked */
}
} else {
if (PRC_IS_REDIRECT(cmd) && inp) {
in6_rtchange((struct in6pcb *)inp,
inet6ctlerrmap[cmd]);
}
if (inp) {
/* 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;
/*
* XXXRW: Other instances of getcred use SUSER_ALLOWJAIL, as socket
* visibility is scoped using cr_canseesocket(), which it is not
* here.
*/
error = priv_check_cred(req->td->td_ucred, PRIV_NETINET_RESERVEDPORT,
0);
if (error)
return (error);
if (req->newlen != sizeof(addrs))
return (EINVAL);
if (req->oldlen != sizeof(struct ucred))
return (EINVAL);
error = SYSCTL_IN(req, addrs, sizeof(addrs));
if (error)
return (error);
stcb = sctp_findassociation_addr_sa(sin6tosa(&addrs[0]),
sin6tosa(&addrs[1]),
&inp, &net, 1);
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;
}
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,
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 sctp_inpcb *inp;
uint32_t flags;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == 0)
return;
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, 1, 0);
SOCK_LOCK(so);
so->so_snd.sb_cc = 0;
so->so_snd.sb_mb = NULL;
so->so_snd.sb_mbcnt = 0;
/*
* same for the rcv ones, they are only here for the
* accounting/select.
*/
so->so_rcv.sb_cc = 0;
so->so_rcv.sb_mb = NULL;
so->so_rcv.sb_mbcnt = 0;
/*
* 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;
}
}
return;
}
static int
sctp6_attach(struct socket *so, int proto, struct thread *p)
{
struct in6pcb *inp6;
int error;
struct sctp_inpcb *inp;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp != NULL)
return EINVAL;
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
error = soreserve(so, sctp_sendspace, sctp_recvspace);
if (error)
return error;
}
error = sctp_inpcb_alloc(so);
if (error)
return error;
inp = (struct sctp_inpcb *)so->so_pcb;
inp->sctp_flags |= SCTP_PCB_FLAGS_BOUND_V6; /* I'm v6! */
inp6 = (struct in6pcb *)inp;
inp6->inp_vflag |= INP_IPV6;
inp6->in6p_hops = -1; /* use kernel default */
inp6->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.
*/
inp6->inp_ip_ttl = ip_defttl;
#endif
/*
* Hmm what about the IPSEC stuff that is missing here but in
* sctp_attach()?
*/
return 0;
}
static int
sctp6_bind(struct socket *so, struct sockaddr *addr, struct thread *p)
{
struct sctp_inpcb *inp;
struct in6pcb *inp6;
int error;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == 0)
return EINVAL;
inp6 = (struct in6pcb *)inp;
inp6->inp_vflag &= ~INP_IPV4;
inp6->inp_vflag |= INP_IPV6;
if ((addr != NULL) && (SCTP_IPV6_V6ONLY(inp6) == 0)) {
if (addr->sa_family == AF_INET) {
/* binding v4 addr to v6 socket, so reset flags */
inp6->inp_vflag |= INP_IPV4;
inp6->inp_vflag &= ~INP_IPV6;
} else {
struct sockaddr_in6 *sin6_p;
sin6_p = (struct sockaddr_in6 *)addr;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
inp6->inp_vflag |= INP_IPV4;
} else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6_p);
inp6->inp_vflag |= INP_IPV4;
inp6->inp_vflag &= ~INP_IPV6;
error = sctp_inpcb_bind(so, (struct sockaddr *)&sin, p);
return error;
}
}
} else if (addr != NULL) {
/* IPV6_V6ONLY socket */
if (addr->sa_family == AF_INET) {
/* can't bind v4 addr to v6 only socket! */
return EINVAL;
} else {
struct sockaddr_in6 *sin6_p;
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 */
return EINVAL;
}
}
error = sctp_inpcb_bind(so, addr, p);
return error;
}
static void
sctp6_close(struct socket *so)
{
struct sctp_inpcb *inp;
uint32_t flags;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == 0)
return;
/*
* Inform all the lower layer assoc that we are done.
*/
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)))) {
if (((so->so_options & SO_LINGER) && (so->so_linger == 0)) ||
(so->so_rcv.sb_cc > 0)) {
#ifdef SCTP_LOG_CLOSING
sctp_log_closing(inp, NULL, 13);
#endif
sctp_inpcb_free(inp, 1, 1);
} else {
#ifdef SCTP_LOG_CLOSING
sctp_log_closing(inp, NULL, 14);
#endif
sctp_inpcb_free(inp, 0, 1);
}
/*
* The socket is now detached, no matter what the state of
* the SCTP association.
*/
SOCK_LOCK(so);
so->so_snd.sb_cc = 0;
so->so_snd.sb_mb = NULL;
so->so_snd.sb_mbcnt = 0;
/*
* same for the rcv ones, they are only here for the
* accounting/select.
*/
so->so_rcv.sb_cc = 0;
so->so_rcv.sb_mb = NULL;
so->so_rcv.sb_mbcnt = 0;
/*
* 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;
}
}
return;
}
static int
sctp6_disconnect(struct socket *so)
{
struct sctp_inpcb *inp;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
return (ENOTCONN);
}
SCTP_INP_RLOCK(inp);
if (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
if (LIST_EMPTY(&inp->sctp_asoc_list)) {
/* No connection */
SCTP_INP_RUNLOCK(inp);
return (ENOTCONN);
} else {
int some_on_streamwheel = 0;
struct sctp_association *asoc;
struct sctp_tcb *stcb;
stcb = LIST_FIRST(&inp->sctp_asoc_list);
if (stcb == NULL) {
SCTP_INP_RUNLOCK(inp);
return (EINVAL);
}
SCTP_TCB_LOCK(stcb);
asoc = &stcb->asoc;
if (((so->so_options & SO_LINGER) &&
(so->so_linger == 0)) ||
(so->so_rcv.sb_cc > 0)) {
if (SCTP_GET_STATE(asoc) !=
SCTP_STATE_COOKIE_WAIT) {
/* Left with Data unread */
struct mbuf *err;
err = NULL;
MGET(err, M_DONTWAIT, MT_DATA);
if (err) {
/*
* Fill in the user
* initiated abort
*/
struct sctp_paramhdr *ph;
ph = mtod(err, struct sctp_paramhdr *);
SCTP_BUF_LEN(err) = sizeof(struct sctp_paramhdr);
ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
ph->param_length = htons(SCTP_BUF_LEN(err));
}
sctp_send_abort_tcb(stcb, err);
SCTP_STAT_INCR_COUNTER32(sctps_aborted);
}
SCTP_INP_RUNLOCK(inp);
if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
(SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
}
sctp_free_assoc(inp, stcb, SCTP_DONOT_SETSCOPE,
SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_2);
/* No unlock tcb assoc is gone */
return (0);
}
if (!TAILQ_EMPTY(&asoc->out_wheel)) {
/* Check to see if some data queued */
struct sctp_stream_out *outs;
TAILQ_FOREACH(outs, &asoc->out_wheel,
next_spoke) {
if (!TAILQ_EMPTY(&outs->outqueue)) {
some_on_streamwheel = 1;
break;
}
}
}
if (TAILQ_EMPTY(&asoc->send_queue) &&
TAILQ_EMPTY(&asoc->sent_queue) &&
(some_on_streamwheel == 0)) {
/* nothing queued to send, so I'm done... */
if ((SCTP_GET_STATE(asoc) !=
SCTP_STATE_SHUTDOWN_SENT) &&
(SCTP_GET_STATE(asoc) !=
SCTP_STATE_SHUTDOWN_ACK_SENT)) {
/* only send SHUTDOWN the first time */
sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
sctp_chunk_output(stcb->sctp_ep, stcb, 1);
asoc->state = SCTP_STATE_SHUTDOWN_SENT;
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
stcb->sctp_ep, stcb,
asoc->primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb,
asoc->primary_destination);
}
} else {
/*
* we still got (or just got) data to send,
* so set SHUTDOWN_PENDING
*/
/*
* XXX sockets draft says that MSG_EOF
* should be sent with no data. currently,
* we will allow user data to be sent first
* and move to SHUTDOWN-PENDING
*/
asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
}
SCTP_TCB_UNLOCK(stcb);
SCTP_INP_RUNLOCK(inp);
return (0);
}
} else {
/* UDP model does not support this */
SCTP_INP_RUNLOCK(inp);
return EOPNOTSUPP;
}
}
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;
struct inpcb *in_inp;
struct in6pcb *inp6;
#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) {
m_freem(control);
control = NULL;
}
m_freem(m);
return EINVAL;
}
in_inp = (struct inpcb *)inp;
inp6 = (struct in6pcb *)inp;
/*
* 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) {
m_freem(m);
if (control) {
m_freem(control);
control = NULL;
}
return (EDESTADDRREQ);
}
#ifdef INET
sin6 = (struct sockaddr_in6 *)addr;
if (SCTP_IPV6_V6ONLY(inp6)) {
/*
* if IPV6_V6ONLY flag, we discard datagrams destined to a
* v4 addr or v4-mapped addr
*/
if (addr->sa_family == AF_INET) {
return EINVAL;
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
return EINVAL;
}
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
if (!ip6_v6only) {
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);
} else {
/* mapped addresses aren't enabled */
return EINVAL;
}
}
#endif /* INET */
connected_type:
/* now what about control */
if (control) {
if (inp->control) {
printf("huh? control set?\n");
m_freem(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.
*/
int ret;
ret = sctp_output(inp, inp->pkt, addr, inp->control, p, flags);
inp->pkt = NULL;
inp->control = NULL;
return (ret);
} else {
return (0);
}
}
static int
sctp6_connect(struct socket *so, struct sockaddr *addr, struct thread *p)
{
int error = 0;
struct sctp_inpcb *inp;
struct in6pcb *inp6;
struct sctp_tcb *stcb;
#ifdef INET
struct sockaddr_in6 *sin6;
struct sockaddr_storage ss;
#endif /* INET */
inp6 = (struct in6pcb *)so->so_pcb;
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == 0) {
return (ECONNRESET); /* I made the same as TCP since we are
* not setup? */
}
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);
return (EADDRINUSE);
}
#ifdef INET
sin6 = (struct sockaddr_in6 *)addr;
if (SCTP_IPV6_V6ONLY(inp6)) {
/*
* 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);
return EINVAL;
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
SCTP_INP_RUNLOCK(inp);
SCTP_ASOC_CREATE_UNLOCK(inp);
return EINVAL;
}
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
if (!ip6_v6only) {
/* convert v4-mapped into v4 addr */
in6_sin6_2_sin((struct sockaddr_in *)&ss, sin6);
addr = (struct sockaddr *)&ss;
} else {
/* mapped addresses aren't enabled */
SCTP_INP_RUNLOCK(inp);
SCTP_ASOC_CREATE_UNLOCK(inp);
return EINVAL;
}
} else
#endif /* INET */
addr = addr; /* for true v6 address case */
/* Now do we connect? */
if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
stcb = LIST_FIRST(&inp->sctp_asoc_list);
if (stcb)
SCTP_TCB_UNLOCK(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);
return (EALREADY);
}
/* We are GOOD to go */
stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0);
SCTP_ASOC_CREATE_UNLOCK(inp);
if (stcb == NULL) {
/* Gak! no memory */
return (error);
}
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
/* Set the connected flag so we can queue data */
soisconnecting(so);
}
stcb->asoc.state = SCTP_STATE_COOKIE_WAIT;
SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
/* initialize authentication parameters for the assoc */
sctp_initialize_auth_params(inp, stcb);
sctp_send_initiate(inp, stcb);
SCTP_TCB_UNLOCK(stcb);
return error;
}
static int
sctp6_getaddr(struct socket *so, struct sockaddr **addr)
{
struct sockaddr_in6 *sin6;
struct sctp_inpcb *inp;
int error;
/*
* Do the malloc first in case it blocks.
*/
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
SCTP_FREE_SONAME(sin6);
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) {
goto notConn6;
}
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 */
goto notConn6;
}
sin6->sin6_addr = sctp_ipv6_source_address_selection(
inp, stcb, (struct route *)&net->ro, net, 0);
} else {
/* For the bound all case you get back 0 */
notConn6:
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->ifa_addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sin_a;
sin_a = (struct sockaddr_in6 *)laddr->ifa->ifa_addr;
sin6->sin6_addr = sin_a->sin6_addr;
fnd = 1;
break;
}
}
if (!fnd) {
SCTP_FREE_SONAME(sin6);
SCTP_INP_RUNLOCK(inp);
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 = (struct sockaddr_in6 *)*addr;
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.
*/
inp = (struct sctp_inpcb *)so->so_pcb;
if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) {
/* UDP type and listeners will drop out here */
return (ENOTCONN);
}
SCTP_MALLOC_SONAME(sin6, struct sockaddr_in6 *, sizeof *sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
/* We must recapture incase we blocked */
inp = (struct sctp_inpcb *)so->so_pcb;
if (inp == NULL) {
SCTP_FREE_SONAME(sin6);
return ECONNRESET;
}
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);
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);
return ENOENT;
}
if ((error = sa6_recoverscope(sin6)) != 0)
return (error);
*addr = (struct sockaddr *)sin6;
return (0);
}
static int
sctp6_in6getaddr(struct socket *so, struct sockaddr **nam)
{
struct sockaddr *addr;
struct in6pcb *inp6 = sotoin6pcb(so);
int error;
if (inp6 == NULL)
return EINVAL;
/* allow v6 addresses precedence */
error = sctp6_getaddr(so, nam);
if (error) {
/* try v4 next if v6 failed */
error = sctp_ingetaddr(so, nam);
if (error) {
return (error);
}
addr = *nam;
/* if I'm V6ONLY, convert it to v4-mapped */
if (SCTP_IPV6_V6ONLY(inp6)) {
struct sockaddr_in6 sin6;
in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
}
}
return (error);
}
static int
sctp6_getpeeraddr(struct socket *so, struct sockaddr **nam)
{
struct sockaddr *addr = *nam;
struct in6pcb *inp6 = sotoin6pcb(so);
int error;
if (inp6 == NULL)
return EINVAL;
/* allow v6 addresses precedence */
error = sctp6_peeraddr(so, nam);
if (error) {
/* try v4 next if v6 failed */
error = sctp_peeraddr(so, nam);
if (error) {
return (error);
}
/* if I'm V6ONLY, convert it to v4-mapped */
if (SCTP_IPV6_V6ONLY(inp6)) {
struct sockaddr_in6 sin6;
in6_sin_2_v4mapsin6((struct sockaddr_in *)addr, &sin6);
memcpy(addr, &sin6, sizeof(struct sockaddr_in6));
}
}
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_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
};
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