void
sctp_listen_hash_insert(sctp_tf_t *tf, sctp_t *sctp)
{
if (sctp->sctp_listen_tfp) {
sctp_listen_hash_remove(sctp);
}
mutex_enter(&tf->tf_lock);
sctp->sctp_listen_hash_next = tf->tf_sctp;
if (tf->tf_sctp) {
tf->tf_sctp->sctp_listen_hash_prev = sctp;
}
sctp->sctp_listen_hash_prev = NULL;
tf->tf_sctp = sctp;
sctp->sctp_listen_tfp = tf;
mutex_exit(&tf->tf_lock);
/*
* On a clustered note send this notification to the clustering
* subsystem.
*/
if (cl_sctp_listen != NULL) {
uchar_t *slist;
ssize_t ssize;
ssize = sizeof (in6_addr_t) * sctp->sctp_nsaddrs;
slist = kmem_alloc(ssize, KM_SLEEP);
sctp_get_saddr_list(sctp, slist, ssize);
(*cl_sctp_listen)(sctp->sctp_family, slist,
sctp->sctp_nsaddrs, sctp->sctp_lport);
/* list will be freed by the clustering module */
}
}
void
sctp_listen_hash_remove(sctp_t *sctp)
{
sctp_tf_t *tf = sctp->sctp_listen_tfp;
if (!tf) {
return;
}
/*
* On a clustered note send this notification to the clustering
* subsystem.
*/
if (cl_sctp_unlisten != NULL) {
uchar_t *slist;
ssize_t ssize;
ssize = sizeof (in6_addr_t) * sctp->sctp_nsaddrs;
slist = kmem_alloc(ssize, KM_SLEEP);
sctp_get_saddr_list(sctp, slist, ssize);
(*cl_sctp_unlisten)(sctp->sctp_family, slist,
sctp->sctp_nsaddrs, sctp->sctp_lport);
/* list will be freed by the clustering module */
}
mutex_enter(&tf->tf_lock);
ASSERT(tf->tf_sctp);
if (tf->tf_sctp == sctp) {
tf->tf_sctp = sctp->sctp_listen_hash_next;
if (sctp->sctp_listen_hash_next) {
ASSERT(tf->tf_sctp->sctp_listen_hash_prev == sctp);
tf->tf_sctp->sctp_listen_hash_prev = NULL;
}
} else {
ASSERT(sctp->sctp_listen_hash_prev);
ASSERT(sctp->sctp_listen_hash_prev->sctp_listen_hash_next ==
sctp);
sctp->sctp_listen_hash_prev->sctp_listen_hash_next =
sctp->sctp_listen_hash_next;
if (sctp->sctp_listen_hash_next) {
ASSERT(
sctp->sctp_listen_hash_next->sctp_listen_hash_prev ==
sctp);
sctp->sctp_listen_hash_next->sctp_listen_hash_prev =
sctp->sctp_listen_hash_prev;
}
}
sctp->sctp_listen_hash_next = NULL;
sctp->sctp_listen_hash_prev = NULL;
sctp->sctp_listen_tfp = NULL;
mutex_exit(&tf->tf_lock);
}
/*
* Connect to a peer - this function inserts the sctp in the
* bind and conn fanouts, sends the INIT, and replies to the client
* with an OK ack.
*/
int
sctp_connect(sctp_t *sctp, const struct sockaddr *dst, uint32_t addrlen,
cred_t *cr, pid_t pid)
{
sin_t *sin;
sin6_t *sin6;
in6_addr_t dstaddr;
in_port_t dstport;
mblk_t *initmp;
sctp_tf_t *tbf;
sctp_t *lsctp;
char buf[INET6_ADDRSTRLEN];
int sleep = sctp->sctp_cansleep ? KM_SLEEP : KM_NOSLEEP;
int err;
sctp_faddr_t *cur_fp;
sctp_stack_t *sctps = sctp->sctp_sctps;
conn_t *connp = sctp->sctp_connp;
uint_t scope_id = 0;
ip_xmit_attr_t *ixa;
/*
* Determine packet type based on type of address passed in
* the request should contain an IPv4 or IPv6 address.
* Make sure that address family matches the type of
* family of the address passed down.
*/
if (addrlen < sizeof (sin_t)) {
return (EINVAL);
}
switch (dst->sa_family) {
case AF_INET:
sin = (sin_t *)dst;
/* Check for attempt to connect to non-unicast */
if (CLASSD(sin->sin_addr.s_addr) ||
(sin->sin_addr.s_addr == INADDR_BROADCAST)) {
ip0dbg(("sctp_connect: non-unicast\n"));
return (EINVAL);
}
if (connp->conn_ipv6_v6only)
return (EAFNOSUPPORT);
/* convert to v6 mapped */
/* Check for attempt to connect to INADDR_ANY */
if (sin->sin_addr.s_addr == INADDR_ANY) {
struct in_addr v4_addr;
/*
* SunOS 4.x and 4.3 BSD allow an application
* to connect a TCP socket to INADDR_ANY.
* When they do this, the kernel picks the
* address of one interface and uses it
* instead. The kernel usually ends up
* picking the address of the loopback
* interface. This is an undocumented feature.
* However, we provide the same thing here
* in case any TCP apps that use this feature
* are being ported to SCTP...
*/
v4_addr.s_addr = htonl(INADDR_LOOPBACK);
IN6_INADDR_TO_V4MAPPED(&v4_addr, &dstaddr);
} else {
IN6_INADDR_TO_V4MAPPED(&sin->sin_addr, &dstaddr);
}
dstport = sin->sin_port;
break;
case AF_INET6:
sin6 = (sin6_t *)dst;
/* Check for attempt to connect to non-unicast. */
if ((addrlen < sizeof (sin6_t)) ||
IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
ip0dbg(("sctp_connect: non-unicast\n"));
return (EINVAL);
}
if (connp->conn_ipv6_v6only &&
IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
return (EAFNOSUPPORT);
}
/* check for attempt to connect to unspec */
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
dstaddr = ipv6_loopback;
} else {
dstaddr = sin6->sin6_addr;
if (IN6_IS_ADDR_LINKLOCAL(&dstaddr)) {
sctp->sctp_linklocal = 1;
scope_id = sin6->sin6_scope_id;
}
}
dstport = sin6->sin6_port;
connp->conn_flowinfo = sin6->sin6_flowinfo;
break;
default:
dprint(1, ("sctp_connect: unknown family %d\n",
dst->sa_family));
return (EAFNOSUPPORT);
}
(void) inet_ntop(AF_INET6, &dstaddr, buf, sizeof (buf));
dprint(1, ("sctp_connect: attempting connect to %s...\n", buf));
RUN_SCTP(sctp);
if (connp->conn_family != dst->sa_family ||
(connp->conn_state_flags & CONN_CLOSING)) {
WAKE_SCTP(sctp);
return (EINVAL);
}
/* We update our cred/cpid based on the caller of connect */
if (connp->conn_cred != cr) {
crhold(cr);
crfree(connp->conn_cred);
connp->conn_cred = cr;
}
connp->conn_cpid = pid;
/* Cache things in conn_ixa without any refhold */
ixa = connp->conn_ixa;
ixa->ixa_cred = cr;
ixa->ixa_cpid = pid;
if (is_system_labeled()) {
/* We need to restart with a label based on the cred */
ip_xmit_attr_restore_tsl(ixa, ixa->ixa_cred);
}
switch (sctp->sctp_state) {
case SCTPS_IDLE: {
struct sockaddr_storage ss;
/*
* We support a quick connect capability here, allowing
* clients to transition directly from IDLE to COOKIE_WAIT.
* sctp_bindi will pick an unused port, insert the connection
* in the bind hash and transition to BOUND state. SCTP
* picks and uses what it considers the optimal local address
* set (just like specifiying INADDR_ANY to bind()).
*/
dprint(1, ("sctp_connect: idle, attempting bind...\n"));
ASSERT(sctp->sctp_nsaddrs == 0);
bzero(&ss, sizeof (ss));
ss.ss_family = connp->conn_family;
WAKE_SCTP(sctp);
if ((err = sctp_bind(sctp, (struct sockaddr *)&ss,
sizeof (ss))) != 0) {
return (err);
}
RUN_SCTP(sctp);
/* FALLTHRU */
}
case SCTPS_BOUND:
ASSERT(sctp->sctp_nsaddrs > 0);
/* do the connect */
/* XXX check for attempt to connect to self */
connp->conn_fport = dstport;
ASSERT(sctp->sctp_iphc);
ASSERT(sctp->sctp_iphc6);
/*
* Don't allow this connection to completely duplicate
* an existing connection.
*
* Ensure that the duplicate check and insertion is atomic.
*/
sctp_conn_hash_remove(sctp);
tbf = &sctps->sctps_conn_fanout[SCTP_CONN_HASH(sctps,
connp->conn_ports)];
mutex_enter(&tbf->tf_lock);
lsctp = sctp_lookup(sctp, &dstaddr, tbf, &connp->conn_ports,
SCTPS_COOKIE_WAIT);
if (lsctp != NULL) {
/* found a duplicate connection */
mutex_exit(&tbf->tf_lock);
SCTP_REFRELE(lsctp);
WAKE_SCTP(sctp);
return (EADDRINUSE);
}
/*
* OK; set up the peer addr (this may grow after we get
* the INIT ACK from the peer with additional addresses).
*/
if ((err = sctp_add_faddr(sctp, &dstaddr, sleep,
B_FALSE)) != 0) {
mutex_exit(&tbf->tf_lock);
WAKE_SCTP(sctp);
return (err);
}
cur_fp = sctp->sctp_faddrs;
ASSERT(cur_fp->ixa != NULL);
/* No valid src addr, return. */
if (cur_fp->state == SCTP_FADDRS_UNREACH) {
mutex_exit(&tbf->tf_lock);
WAKE_SCTP(sctp);
return (EADDRNOTAVAIL);
}
sctp->sctp_primary = cur_fp;
sctp->sctp_current = cur_fp;
sctp->sctp_mss = cur_fp->sfa_pmss;
sctp_conn_hash_insert(tbf, sctp, 1);
mutex_exit(&tbf->tf_lock);
ixa = cur_fp->ixa;
ASSERT(ixa->ixa_cred != NULL);
if (scope_id != 0) {
ixa->ixa_flags |= IXAF_SCOPEID_SET;
ixa->ixa_scopeid = scope_id;
} else {
ixa->ixa_flags &= ~IXAF_SCOPEID_SET;
}
/* initialize composite headers */
if ((err = sctp_set_hdraddrs(sctp)) != 0) {
sctp_conn_hash_remove(sctp);
WAKE_SCTP(sctp);
return (err);
}
if ((err = sctp_build_hdrs(sctp, KM_SLEEP)) != 0) {
sctp_conn_hash_remove(sctp);
WAKE_SCTP(sctp);
return (err);
}
/*
* Turn off the don't fragment bit on the (only) faddr,
* so that if one of the messages exchanged during the
* initialization sequence exceeds the path mtu, it
* at least has a chance to get there. SCTP does no
* fragmentation of initialization messages. The DF bit
* will be turned on again in sctp_send_cookie_echo()
* (but the cookie echo will still be sent with the df bit
* off).
*/
cur_fp->df = B_FALSE;
/* Mark this address as alive */
cur_fp->state = SCTP_FADDRS_ALIVE;
/* Send the INIT to the peer */
SCTP_FADDR_TIMER_RESTART(sctp, cur_fp, cur_fp->rto);
sctp->sctp_state = SCTPS_COOKIE_WAIT;
/*
* sctp_init_mp() could result in modifying the source
* address list, so take the hash lock.
*/
mutex_enter(&tbf->tf_lock);
initmp = sctp_init_mp(sctp, cur_fp);
if (initmp == NULL) {
mutex_exit(&tbf->tf_lock);
/*
* It may happen that all the source addresses
* (loopback/link local) are removed. In that case,
* faile the connect.
*/
if (sctp->sctp_nsaddrs == 0) {
sctp_conn_hash_remove(sctp);
SCTP_FADDR_TIMER_STOP(cur_fp);
WAKE_SCTP(sctp);
return (EADDRNOTAVAIL);
}
/* Otherwise, let the retransmission timer retry */
WAKE_SCTP(sctp);
goto notify_ulp;
}
mutex_exit(&tbf->tf_lock);
/*
* On a clustered note send this notification to the clustering
* subsystem.
*/
if (cl_sctp_connect != NULL) {
uchar_t *slist;
uchar_t *flist;
size_t ssize;
size_t fsize;
fsize = sizeof (in6_addr_t) * sctp->sctp_nfaddrs;
ssize = sizeof (in6_addr_t) * sctp->sctp_nsaddrs;
slist = kmem_alloc(ssize, KM_SLEEP);
flist = kmem_alloc(fsize, KM_SLEEP);
/* The clustering module frees the lists */
sctp_get_saddr_list(sctp, slist, ssize);
sctp_get_faddr_list(sctp, flist, fsize);
(*cl_sctp_connect)(connp->conn_family, slist,
sctp->sctp_nsaddrs, connp->conn_lport,
flist, sctp->sctp_nfaddrs, connp->conn_fport,
B_TRUE, (cl_sctp_handle_t)sctp);
}
ASSERT(ixa->ixa_cred != NULL);
ASSERT(ixa->ixa_ire != NULL);
(void) conn_ip_output(initmp, ixa);
BUMP_LOCAL(sctp->sctp_opkts);
WAKE_SCTP(sctp);
notify_ulp:
sctp_set_ulp_prop(sctp);
return (0);
default:
ip0dbg(("sctp_connect: invalid state. %d\n", sctp->sctp_state));
WAKE_SCTP(sctp);
return (EINVAL);
}
}
/*
* Exported routine for extracting active SCTP associations.
* Like TCP, we terminate the walk if the callback returns non-zero.
*/
int
cl_sctp_walk_list(int (*cl_callback)(cl_sctp_info_t *, void *), void *arg,
boolean_t cansleep)
{
sctp_t *sctp;
sctp_t *sctp_prev;
cl_sctp_info_t cl_sctpi;
uchar_t *slist;
uchar_t *flist;
sctp = gsctp;
sctp_prev = NULL;
mutex_enter(&sctp_g_lock);
while (sctp != NULL) {
size_t ssize;
size_t fsize;
mutex_enter(&sctp->sctp_reflock);
if (sctp->sctp_condemned || sctp->sctp_state <= SCTPS_LISTEN) {
mutex_exit(&sctp->sctp_reflock);
sctp = list_next(&sctp_g_list, sctp);
continue;
}
sctp->sctp_refcnt++;
mutex_exit(&sctp->sctp_reflock);
mutex_exit(&sctp_g_lock);
if (sctp_prev != NULL)
SCTP_REFRELE(sctp_prev);
RUN_SCTP(sctp);
ssize = sizeof (in6_addr_t) * sctp->sctp_nsaddrs;
fsize = sizeof (in6_addr_t) * sctp->sctp_nfaddrs;
slist = kmem_alloc(ssize, cansleep ? KM_SLEEP : KM_NOSLEEP);
flist = kmem_alloc(fsize, cansleep ? KM_SLEEP : KM_NOSLEEP);
if (slist == NULL || flist == NULL) {
WAKE_SCTP(sctp);
if (slist != NULL)
kmem_free(slist, ssize);
if (flist != NULL)
kmem_free(flist, fsize);
SCTP_REFRELE(sctp);
return (1);
}
cl_sctpi.cl_sctpi_version = CL_SCTPI_V1;
sctp_get_saddr_list(sctp, slist, ssize);
sctp_get_faddr_list(sctp, flist, fsize);
cl_sctpi.cl_sctpi_nladdr = sctp->sctp_nsaddrs;
cl_sctpi.cl_sctpi_nfaddr = sctp->sctp_nfaddrs;
cl_sctpi.cl_sctpi_family = sctp->sctp_family;
cl_sctpi.cl_sctpi_ipversion = sctp->sctp_ipversion;
cl_sctpi.cl_sctpi_state = sctp->sctp_state;
cl_sctpi.cl_sctpi_lport = sctp->sctp_lport;
cl_sctpi.cl_sctpi_fport = sctp->sctp_fport;
cl_sctpi.cl_sctpi_handle = (cl_sctp_handle_t)sctp;
WAKE_SCTP(sctp);
cl_sctpi.cl_sctpi_laddrp = slist;
cl_sctpi.cl_sctpi_faddrp = flist;
if ((*cl_callback)(&cl_sctpi, arg) != 0) {
kmem_free(slist, ssize);
kmem_free(flist, fsize);
SCTP_REFRELE(sctp);
return (1);
}
/* list will be freed by cl_callback */
sctp_prev = sctp;
mutex_enter(&sctp_g_lock);
sctp = list_next(&sctp_g_list, sctp);
}
mutex_exit(&sctp_g_lock);
if (sctp_prev != NULL)
SCTP_REFRELE(sctp_prev);
return (0);
}
/* Process the COOKIE packet, mp, directed at the listener 'sctp' */
sctp_t *
sctp_conn_request(sctp_t *sctp, mblk_t *mp, uint_t ifindex, uint_t ip_hdr_len,
sctp_init_chunk_t *iack, ip_recv_attr_t *ira)
{
sctp_t *eager;
ip6_t *ip6h;
int err;
conn_t *connp, *econnp;
sctp_stack_t *sctps;
struct sock_proto_props sopp;
cred_t *cr;
pid_t cpid;
in6_addr_t faddr, laddr;
ip_xmit_attr_t *ixa;
/*
* No need to check for duplicate as this is the listener
* and we are holding the lock. This means that no new
* connection can be created out of it. And since the
* fanout already done cannot find a match, it means that
* there is no duplicate.
*/
ASSERT(OK_32PTR(mp->b_rptr));
if ((eager = sctp_create_eager(sctp)) == NULL) {
return (NULL);
}
connp = sctp->sctp_connp;
sctps = sctp->sctp_sctps;
econnp = eager->sctp_connp;
if (connp->conn_policy != NULL) {
/* Inherit the policy from the listener; use actions from ira */
if (!ip_ipsec_policy_inherit(econnp, connp, ira)) {
sctp_close_eager(eager);
BUMP_MIB(&sctps->sctps_mib, sctpListenDrop);
return (NULL);
}
}
ip6h = (ip6_t *)mp->b_rptr;
if (ira->ira_flags & IXAF_IS_IPV4) {
ipha_t *ipha;
ipha = (ipha_t *)ip6h;
IN6_IPADDR_TO_V4MAPPED(ipha->ipha_dst, &laddr);
IN6_IPADDR_TO_V4MAPPED(ipha->ipha_src, &faddr);
} else {
laddr = ip6h->ip6_dst;
faddr = ip6h->ip6_src;
}
if (ira->ira_flags & IRAF_IPSEC_SECURE) {
/*
* XXX need to fix the cached policy issue here.
* We temporarily set the conn_laddr/conn_faddr here so
* that IPsec can use it for the latched policy
* selector. This is obvioursly wrong as SCTP can
* use different addresses...
*/
econnp->conn_laddr_v6 = laddr;
econnp->conn_faddr_v6 = faddr;
econnp->conn_saddr_v6 = laddr;
}
if (ipsec_conn_cache_policy(econnp,
(ira->ira_flags & IRAF_IS_IPV4) != 0) != 0) {
sctp_close_eager(eager);
BUMP_MIB(&sctps->sctps_mib, sctpListenDrop);
return (NULL);
}
/* Save for getpeerucred */
cr = ira->ira_cred;
cpid = ira->ira_cpid;
if (is_system_labeled()) {
ip_xmit_attr_t *ixa = econnp->conn_ixa;
ASSERT(ira->ira_tsl != NULL);
/* Discard any old label */
if (ixa->ixa_free_flags & IXA_FREE_TSL) {
ASSERT(ixa->ixa_tsl != NULL);
label_rele(ixa->ixa_tsl);
ixa->ixa_free_flags &= ~IXA_FREE_TSL;
ixa->ixa_tsl = NULL;
}
if ((connp->conn_mlp_type != mlptSingle ||
connp->conn_mac_mode != CONN_MAC_DEFAULT) &&
ira->ira_tsl != NULL) {
/*
* If this is an MLP connection or a MAC-Exempt
* connection with an unlabeled node, packets are to be
* exchanged using the security label of the received
* Cookie packet instead of the server application's
* label.
* tsol_check_dest called from ip_set_destination
* might later update TSF_UNLABELED by replacing
* ixa_tsl with a new label.
*/
label_hold(ira->ira_tsl);
ip_xmit_attr_replace_tsl(ixa, ira->ira_tsl);
} else {
ixa->ixa_tsl = crgetlabel(econnp->conn_cred);
}
}
err = sctp_accept_comm(sctp, eager, mp, ip_hdr_len, iack);
if (err != 0) {
sctp_close_eager(eager);
BUMP_MIB(&sctps->sctps_mib, sctpListenDrop);
return (NULL);
}
ASSERT(eager->sctp_current->ixa != NULL);
ixa = eager->sctp_current->ixa;
if (!(ira->ira_flags & IXAF_IS_IPV4)) {
ASSERT(!(ixa->ixa_flags & IXAF_IS_IPV4));
if (IN6_IS_ADDR_LINKLOCAL(&ip6h->ip6_src) ||
IN6_IS_ADDR_LINKLOCAL(&ip6h->ip6_dst)) {
eager->sctp_linklocal = 1;
ixa->ixa_flags |= IXAF_SCOPEID_SET;
ixa->ixa_scopeid = ifindex;
econnp->conn_incoming_ifindex = ifindex;
}
}
/*
* On a clustered note send this notification to the clustering
* subsystem.
*/
if (cl_sctp_connect != NULL) {
uchar_t *slist;
uchar_t *flist;
size_t fsize;
size_t ssize;
fsize = sizeof (in6_addr_t) * eager->sctp_nfaddrs;
ssize = sizeof (in6_addr_t) * eager->sctp_nsaddrs;
slist = kmem_alloc(ssize, KM_NOSLEEP);
flist = kmem_alloc(fsize, KM_NOSLEEP);
if (slist == NULL || flist == NULL) {
if (slist != NULL)
kmem_free(slist, ssize);
if (flist != NULL)
kmem_free(flist, fsize);
sctp_close_eager(eager);
BUMP_MIB(&sctps->sctps_mib, sctpListenDrop);
SCTP_KSTAT(sctps, sctp_cl_connect);
return (NULL);
}
/* The clustering module frees these list */
sctp_get_saddr_list(eager, slist, ssize);
sctp_get_faddr_list(eager, flist, fsize);
(*cl_sctp_connect)(econnp->conn_family, slist,
eager->sctp_nsaddrs, econnp->conn_lport, flist,
eager->sctp_nfaddrs, econnp->conn_fport, B_FALSE,
(cl_sctp_handle_t)eager);
}
/* Connection established, so send up the conn_ind */
if ((eager->sctp_ulpd = sctp->sctp_ulp_newconn(sctp->sctp_ulpd,
(sock_lower_handle_t)eager, NULL, cr, cpid,
&eager->sctp_upcalls)) == NULL) {
sctp_close_eager(eager);
BUMP_MIB(&sctps->sctps_mib, sctpListenDrop);
return (NULL);
}
ASSERT(SCTP_IS_DETACHED(eager));
eager->sctp_detached = B_FALSE;
bzero(&sopp, sizeof (sopp));
sopp.sopp_flags = SOCKOPT_MAXBLK|SOCKOPT_WROFF;
sopp.sopp_maxblk = strmsgsz;
if (econnp->conn_family == AF_INET) {
sopp.sopp_wroff = sctps->sctps_wroff_xtra +
sizeof (sctp_data_hdr_t) + sctp->sctp_hdr_len;
} else {
sopp.sopp_wroff = sctps->sctps_wroff_xtra +
sizeof (sctp_data_hdr_t) + sctp->sctp_hdr6_len;
}
eager->sctp_ulp_prop(eager->sctp_ulpd, &sopp);
return (eager);
}