2 * net/tipc/port.c: TIPC port code
4 * Copyright (c) 1992-2007, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
40 #include "name_table.h"
42 /* Connection management: */
43 #define PROBING_INTERVAL 3600000 /* [ms] => 1 h */
47 #define MAX_REJECT_SIZE 1024
49 static struct sk_buff *msg_queue_head;
50 static struct sk_buff *msg_queue_tail;
52 DEFINE_SPINLOCK(tipc_port_list_lock);
53 static DEFINE_SPINLOCK(queue_lock);
55 static LIST_HEAD(ports);
56 static void port_handle_node_down(unsigned long ref);
57 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
58 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
59 static void port_timeout(unsigned long ref);
62 static u32 port_peernode(struct tipc_port *p_ptr)
64 return msg_destnode(&p_ptr->phdr);
67 static u32 port_peerport(struct tipc_port *p_ptr)
69 return msg_destport(&p_ptr->phdr);
73 * tipc_port_peer_msg - verify message was sent by connected port's peer
75 * Handles cases where the node's network address has changed from
76 * the default of <0.0.0> to its configured setting.
78 int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
83 if (msg_origport(msg) != port_peerport(p_ptr))
86 orignode = msg_orignode(msg);
87 peernode = port_peernode(p_ptr);
88 return (orignode == peernode) ||
89 (!orignode && (peernode == tipc_own_addr)) ||
90 (!peernode && (orignode == tipc_own_addr));
94 * tipc_multicast - send a multicast message to local and remote destinations
96 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
97 u32 num_sect, struct iovec const *msg_sect,
98 unsigned int total_len)
100 struct tipc_msg *hdr;
102 struct sk_buff *ibuf = NULL;
103 struct tipc_port_list dports = {0, NULL, };
104 struct tipc_port *oport = tipc_port_deref(ref);
108 if (unlikely(!oport))
111 /* Create multicast message */
113 msg_set_type(hdr, TIPC_MCAST_MSG);
114 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
115 msg_set_destport(hdr, 0);
116 msg_set_destnode(hdr, 0);
117 msg_set_nametype(hdr, seq->type);
118 msg_set_namelower(hdr, seq->lower);
119 msg_set_nameupper(hdr, seq->upper);
120 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
121 res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
122 !oport->user_port, &buf);
126 /* Figure out where to send multicast message */
127 ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
128 TIPC_NODE_SCOPE, &dports);
130 /* Send message to destinations (duplicate it only if necessary) */
132 if (dports.count != 0) {
133 ibuf = skb_copy(buf, GFP_ATOMIC);
135 tipc_port_list_free(&dports);
140 res = tipc_bclink_send_msg(buf);
141 if ((res < 0) && (dports.count != 0))
149 tipc_port_recv_mcast(ibuf, &dports);
151 tipc_port_list_free(&dports);
157 * tipc_port_recv_mcast - deliver multicast message to all destination ports
159 * If there is no port list, perform a lookup to create one
161 void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp)
163 struct tipc_msg *msg;
164 struct tipc_port_list dports = {0, NULL, };
165 struct tipc_port_list *item = dp;
170 /* Create destination port list, if one wasn't supplied */
172 tipc_nametbl_mc_translate(msg_nametype(msg),
180 /* Deliver a copy of message to each destination port */
181 if (dp->count != 0) {
182 msg_set_destnode(msg, tipc_own_addr);
183 if (dp->count == 1) {
184 msg_set_destport(msg, dp->ports[0]);
185 tipc_port_recv_msg(buf);
186 tipc_port_list_free(dp);
189 for (; cnt < dp->count; cnt++) {
190 int index = cnt % PLSIZE;
191 struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
194 pr_warn("Unable to deliver multicast message(s)\n");
197 if ((index == 0) && (cnt != 0))
199 msg_set_destport(buf_msg(b), item->ports[index]);
200 tipc_port_recv_msg(b);
205 tipc_port_list_free(dp);
209 * tipc_createport_raw - create a generic TIPC port
211 * Returns pointer to (locked) TIPC port, or NULL if unable to create it
213 struct tipc_port *tipc_createport_raw(void *usr_handle,
214 u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
215 void (*wakeup)(struct tipc_port *),
216 const u32 importance)
218 struct tipc_port *p_ptr;
219 struct tipc_msg *msg;
222 p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
224 pr_warn("Port creation failed, no memory\n");
227 ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
229 pr_warn("Port creation failed, ref. table exhausted\n");
234 p_ptr->usr_handle = usr_handle;
235 p_ptr->max_pkt = MAX_PKT_DEFAULT;
237 INIT_LIST_HEAD(&p_ptr->wait_list);
238 INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
239 p_ptr->dispatcher = dispatcher;
240 p_ptr->wakeup = wakeup;
241 p_ptr->user_port = NULL;
242 k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
243 INIT_LIST_HEAD(&p_ptr->publications);
244 INIT_LIST_HEAD(&p_ptr->port_list);
247 * Must hold port list lock while initializing message header template
248 * to ensure a change to node's own network address doesn't result
249 * in template containing out-dated network address information
251 spin_lock_bh(&tipc_port_list_lock);
253 tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
254 msg_set_origport(msg, ref);
255 list_add_tail(&p_ptr->port_list, &ports);
256 spin_unlock_bh(&tipc_port_list_lock);
260 int tipc_deleteport(u32 ref)
262 struct tipc_port *p_ptr;
263 struct sk_buff *buf = NULL;
265 tipc_withdraw(ref, 0, NULL);
266 p_ptr = tipc_port_lock(ref);
270 tipc_ref_discard(ref);
271 tipc_port_unlock(p_ptr);
273 k_cancel_timer(&p_ptr->timer);
274 if (p_ptr->connected) {
275 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
276 tipc_nodesub_unsubscribe(&p_ptr->subscription);
278 kfree(p_ptr->user_port);
280 spin_lock_bh(&tipc_port_list_lock);
281 list_del(&p_ptr->port_list);
282 list_del(&p_ptr->wait_list);
283 spin_unlock_bh(&tipc_port_list_lock);
284 k_term_timer(&p_ptr->timer);
286 tipc_net_route_msg(buf);
290 static int port_unreliable(struct tipc_port *p_ptr)
292 return msg_src_droppable(&p_ptr->phdr);
295 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
297 struct tipc_port *p_ptr;
299 p_ptr = tipc_port_lock(ref);
302 *isunreliable = port_unreliable(p_ptr);
303 tipc_port_unlock(p_ptr);
307 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
309 struct tipc_port *p_ptr;
311 p_ptr = tipc_port_lock(ref);
314 msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
315 tipc_port_unlock(p_ptr);
319 static int port_unreturnable(struct tipc_port *p_ptr)
321 return msg_dest_droppable(&p_ptr->phdr);
324 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
326 struct tipc_port *p_ptr;
328 p_ptr = tipc_port_lock(ref);
331 *isunrejectable = port_unreturnable(p_ptr);
332 tipc_port_unlock(p_ptr);
336 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
338 struct tipc_port *p_ptr;
340 p_ptr = tipc_port_lock(ref);
343 msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
344 tipc_port_unlock(p_ptr);
349 * port_build_proto_msg(): create connection protocol message for port
351 * On entry the port must be locked and connected.
353 static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
357 struct tipc_msg *msg;
359 buf = tipc_buf_acquire(INT_H_SIZE);
362 tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
363 port_peernode(p_ptr));
364 msg_set_destport(msg, port_peerport(p_ptr));
365 msg_set_origport(msg, p_ptr->ref);
366 msg_set_msgcnt(msg, ack);
371 int tipc_reject_msg(struct sk_buff *buf, u32 err)
373 struct tipc_msg *msg = buf_msg(buf);
374 struct sk_buff *rbuf;
375 struct tipc_msg *rmsg;
378 u32 data_sz = msg_data_sz(msg);
382 /* discard rejected message if it shouldn't be returned to sender */
383 if (WARN(!msg_isdata(msg),
384 "attempt to reject message with user=%u", msg_user(msg))) {
388 if (msg_errcode(msg) || msg_dest_droppable(msg))
392 * construct returned message by copying rejected message header and
393 * data (or subset), then updating header fields that need adjusting
395 hdr_sz = msg_hdr_sz(msg);
396 rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
398 rbuf = tipc_buf_acquire(rmsg_sz);
402 rmsg = buf_msg(rbuf);
403 skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
405 if (msg_connected(rmsg)) {
406 imp = msg_importance(rmsg);
407 if (imp < TIPC_CRITICAL_IMPORTANCE)
408 msg_set_importance(rmsg, ++imp);
410 msg_set_non_seq(rmsg, 0);
411 msg_set_size(rmsg, rmsg_sz);
412 msg_set_errcode(rmsg, err);
413 msg_set_prevnode(rmsg, tipc_own_addr);
414 msg_swap_words(rmsg, 4, 5);
415 if (!msg_short(rmsg))
416 msg_swap_words(rmsg, 6, 7);
418 /* send self-abort message when rejecting on a connected port */
419 if (msg_connected(msg)) {
420 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
423 struct sk_buff *abuf = NULL;
425 if (p_ptr->connected)
426 abuf = port_build_self_abort_msg(p_ptr, err);
427 tipc_port_unlock(p_ptr);
428 tipc_net_route_msg(abuf);
432 /* send returned message & dispose of rejected message */
433 src_node = msg_prevnode(msg);
434 if (in_own_node(src_node))
435 tipc_port_recv_msg(rbuf);
437 tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
443 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
444 struct iovec const *msg_sect, u32 num_sect,
445 unsigned int total_len, int err)
450 res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
451 !p_ptr->user_port, &buf);
455 return tipc_reject_msg(buf, err);
458 static void port_timeout(unsigned long ref)
460 struct tipc_port *p_ptr = tipc_port_lock(ref);
461 struct sk_buff *buf = NULL;
466 if (!p_ptr->connected) {
467 tipc_port_unlock(p_ptr);
471 /* Last probe answered ? */
472 if (p_ptr->probing_state == PROBING) {
473 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
475 buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
476 p_ptr->probing_state = PROBING;
477 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
479 tipc_port_unlock(p_ptr);
480 tipc_net_route_msg(buf);
484 static void port_handle_node_down(unsigned long ref)
486 struct tipc_port *p_ptr = tipc_port_lock(ref);
487 struct sk_buff *buf = NULL;
491 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
492 tipc_port_unlock(p_ptr);
493 tipc_net_route_msg(buf);
497 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
499 struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
502 struct tipc_msg *msg = buf_msg(buf);
503 msg_swap_words(msg, 4, 5);
504 msg_swap_words(msg, 6, 7);
510 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
513 struct tipc_msg *msg;
516 if (!p_ptr->connected)
519 buf = tipc_buf_acquire(BASIC_H_SIZE);
522 memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
523 msg_set_hdr_sz(msg, BASIC_H_SIZE);
524 msg_set_size(msg, BASIC_H_SIZE);
525 imp = msg_importance(msg);
526 if (imp < TIPC_CRITICAL_IMPORTANCE)
527 msg_set_importance(msg, ++imp);
528 msg_set_errcode(msg, err);
533 void tipc_port_recv_proto_msg(struct sk_buff *buf)
535 struct tipc_msg *msg = buf_msg(buf);
536 struct tipc_port *p_ptr;
537 struct sk_buff *r_buf = NULL;
538 u32 destport = msg_destport(msg);
541 /* Validate connection */
542 p_ptr = tipc_port_lock(destport);
543 if (!p_ptr || !p_ptr->connected || !tipc_port_peer_msg(p_ptr, msg)) {
544 r_buf = tipc_buf_acquire(BASIC_H_SIZE);
546 msg = buf_msg(r_buf);
547 tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
548 BASIC_H_SIZE, msg_orignode(msg));
549 msg_set_errcode(msg, TIPC_ERR_NO_PORT);
550 msg_set_origport(msg, destport);
551 msg_set_destport(msg, msg_origport(msg));
554 tipc_port_unlock(p_ptr);
558 /* Process protocol message sent by peer */
559 switch (msg_type(msg)) {
561 wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
563 p_ptr->acked += msg_msgcnt(msg);
564 if (!tipc_port_congested(p_ptr)) {
565 p_ptr->congested = 0;
567 p_ptr->wakeup(p_ptr);
571 r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
574 /* CONN_PROBE_REPLY or unrecognized - no action required */
577 p_ptr->probing_state = CONFIRMED;
578 tipc_port_unlock(p_ptr);
580 tipc_net_route_msg(r_buf);
584 static int port_print(struct tipc_port *p_ptr, char *buf, int len, int full_id)
586 struct publication *publ;
590 ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
591 tipc_zone(tipc_own_addr),
592 tipc_cluster(tipc_own_addr),
593 tipc_node(tipc_own_addr), p_ptr->ref);
595 ret = tipc_snprintf(buf, len, "%-10u:", p_ptr->ref);
597 if (p_ptr->connected) {
598 u32 dport = port_peerport(p_ptr);
599 u32 destnode = port_peernode(p_ptr);
601 ret += tipc_snprintf(buf + ret, len - ret,
602 " connected to <%u.%u.%u:%u>",
604 tipc_cluster(destnode),
605 tipc_node(destnode), dport);
606 if (p_ptr->conn_type != 0)
607 ret += tipc_snprintf(buf + ret, len - ret,
608 " via {%u,%u}", p_ptr->conn_type,
609 p_ptr->conn_instance);
610 } else if (p_ptr->published) {
611 ret += tipc_snprintf(buf + ret, len - ret, " bound to");
612 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
613 if (publ->lower == publ->upper)
614 ret += tipc_snprintf(buf + ret, len - ret,
615 " {%u,%u}", publ->type,
618 ret += tipc_snprintf(buf + ret, len - ret,
619 " {%u,%u,%u}", publ->type,
620 publ->lower, publ->upper);
623 ret += tipc_snprintf(buf + ret, len - ret, "\n");
627 struct sk_buff *tipc_port_get_ports(void)
630 struct tlv_desc *rep_tlv;
633 struct tipc_port *p_ptr;
636 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
639 rep_tlv = (struct tlv_desc *)buf->data;
640 pb = TLV_DATA(rep_tlv);
641 pb_len = ULTRA_STRING_MAX_LEN;
643 spin_lock_bh(&tipc_port_list_lock);
644 list_for_each_entry(p_ptr, &ports, port_list) {
645 spin_lock_bh(p_ptr->lock);
646 str_len += port_print(p_ptr, pb, pb_len, 0);
647 spin_unlock_bh(p_ptr->lock);
649 spin_unlock_bh(&tipc_port_list_lock);
650 str_len += 1; /* for "\0" */
651 skb_put(buf, TLV_SPACE(str_len));
652 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
657 void tipc_port_reinit(void)
659 struct tipc_port *p_ptr;
660 struct tipc_msg *msg;
662 spin_lock_bh(&tipc_port_list_lock);
663 list_for_each_entry(p_ptr, &ports, port_list) {
665 msg_set_prevnode(msg, tipc_own_addr);
666 msg_set_orignode(msg, tipc_own_addr);
668 spin_unlock_bh(&tipc_port_list_lock);
673 * port_dispatcher_sigh(): Signal handler for messages destinated
674 * to the tipc_port interface.
676 static void port_dispatcher_sigh(void *dummy)
680 spin_lock_bh(&queue_lock);
681 buf = msg_queue_head;
682 msg_queue_head = NULL;
683 spin_unlock_bh(&queue_lock);
686 struct tipc_port *p_ptr;
687 struct user_port *up_ptr;
688 struct tipc_portid orig;
689 struct tipc_name_seq dseq;
696 struct sk_buff *next = buf->next;
697 struct tipc_msg *msg = buf_msg(buf);
698 u32 dref = msg_destport(msg);
700 message_type = msg_type(msg);
701 if (message_type > TIPC_DIRECT_MSG)
702 goto reject; /* Unsupported message type */
704 p_ptr = tipc_port_lock(dref);
706 goto reject; /* Port deleted while msg in queue */
708 orig.ref = msg_origport(msg);
709 orig.node = msg_orignode(msg);
710 up_ptr = p_ptr->user_port;
711 usr_handle = up_ptr->usr_handle;
712 connected = p_ptr->connected;
713 peer_invalid = connected && !tipc_port_peer_msg(p_ptr, msg);
714 published = p_ptr->published;
716 if (unlikely(msg_errcode(msg)))
719 switch (message_type) {
722 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
725 tipc_port_unlock(p_ptr);
728 if (unlikely(!connected)) {
729 if (tipc_connect2port(dref, &orig))
731 } else if (peer_invalid)
733 dsz = msg_data_sz(msg);
735 (++p_ptr->conn_unacked >=
736 TIPC_FLOW_CONTROL_WIN)))
737 tipc_acknowledge(dref,
738 p_ptr->conn_unacked);
739 skb_pull(buf, msg_hdr_sz(msg));
740 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
743 case TIPC_DIRECT_MSG:{
744 tipc_msg_event cb = up_ptr->msg_cb;
746 tipc_port_unlock(p_ptr);
747 if (unlikely(!cb || connected))
749 skb_pull(buf, msg_hdr_sz(msg));
750 cb(usr_handle, dref, &buf, msg_data(msg),
751 msg_data_sz(msg), msg_importance(msg),
756 case TIPC_NAMED_MSG:{
757 tipc_named_msg_event cb = up_ptr->named_msg_cb;
759 tipc_port_unlock(p_ptr);
760 if (unlikely(!cb || connected || !published))
762 dseq.type = msg_nametype(msg);
763 dseq.lower = msg_nameinst(msg);
764 dseq.upper = (message_type == TIPC_NAMED_MSG)
765 ? dseq.lower : msg_nameupper(msg);
766 skb_pull(buf, msg_hdr_sz(msg));
767 cb(usr_handle, dref, &buf, msg_data(msg),
768 msg_data_sz(msg), msg_importance(msg),
778 switch (message_type) {
781 tipc_conn_shutdown_event cb =
784 tipc_port_unlock(p_ptr);
785 if (!cb || !connected || peer_invalid)
787 tipc_disconnect(dref);
788 skb_pull(buf, msg_hdr_sz(msg));
789 cb(usr_handle, dref, &buf, msg_data(msg),
790 msg_data_sz(msg), msg_errcode(msg));
793 case TIPC_DIRECT_MSG:{
794 tipc_msg_err_event cb = up_ptr->err_cb;
796 tipc_port_unlock(p_ptr);
797 if (!cb || connected)
799 skb_pull(buf, msg_hdr_sz(msg));
800 cb(usr_handle, dref, &buf, msg_data(msg),
801 msg_data_sz(msg), msg_errcode(msg), &orig);
805 case TIPC_NAMED_MSG:{
806 tipc_named_msg_err_event cb =
807 up_ptr->named_err_cb;
809 tipc_port_unlock(p_ptr);
810 if (!cb || connected)
812 dseq.type = msg_nametype(msg);
813 dseq.lower = msg_nameinst(msg);
814 dseq.upper = (message_type == TIPC_NAMED_MSG)
815 ? dseq.lower : msg_nameupper(msg);
816 skb_pull(buf, msg_hdr_sz(msg));
817 cb(usr_handle, dref, &buf, msg_data(msg),
818 msg_data_sz(msg), msg_errcode(msg), &dseq);
827 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
833 * port_dispatcher(): Dispatcher for messages destinated
834 * to the tipc_port interface. Called with port locked.
836 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
839 spin_lock_bh(&queue_lock);
840 if (msg_queue_head) {
841 msg_queue_tail->next = buf;
842 msg_queue_tail = buf;
844 msg_queue_tail = msg_queue_head = buf;
845 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
847 spin_unlock_bh(&queue_lock);
852 * Wake up port after congestion: Called with port locked
854 static void port_wakeup_sh(unsigned long ref)
856 struct tipc_port *p_ptr;
857 struct user_port *up_ptr;
858 tipc_continue_event cb = NULL;
861 p_ptr = tipc_port_lock(ref);
863 up_ptr = p_ptr->user_port;
865 cb = up_ptr->continue_event_cb;
866 uh = up_ptr->usr_handle;
868 tipc_port_unlock(p_ptr);
875 static void port_wakeup(struct tipc_port *p_ptr)
877 tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
880 void tipc_acknowledge(u32 ref, u32 ack)
882 struct tipc_port *p_ptr;
883 struct sk_buff *buf = NULL;
885 p_ptr = tipc_port_lock(ref);
888 if (p_ptr->connected) {
889 p_ptr->conn_unacked -= ack;
890 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
892 tipc_port_unlock(p_ptr);
893 tipc_net_route_msg(buf);
897 * tipc_createport(): user level call.
899 int tipc_createport(void *usr_handle,
900 unsigned int importance,
901 tipc_msg_err_event error_cb,
902 tipc_named_msg_err_event named_error_cb,
903 tipc_conn_shutdown_event conn_error_cb,
904 tipc_msg_event msg_cb,
905 tipc_named_msg_event named_msg_cb,
906 tipc_conn_msg_event conn_msg_cb,
907 tipc_continue_event continue_event_cb, /* May be zero */
910 struct user_port *up_ptr;
911 struct tipc_port *p_ptr;
913 up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
915 pr_warn("Port creation failed, no memory\n");
918 p_ptr = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
925 p_ptr->user_port = up_ptr;
926 up_ptr->usr_handle = usr_handle;
927 up_ptr->ref = p_ptr->ref;
928 up_ptr->err_cb = error_cb;
929 up_ptr->named_err_cb = named_error_cb;
930 up_ptr->conn_err_cb = conn_error_cb;
931 up_ptr->msg_cb = msg_cb;
932 up_ptr->named_msg_cb = named_msg_cb;
933 up_ptr->conn_msg_cb = conn_msg_cb;
934 up_ptr->continue_event_cb = continue_event_cb;
935 *portref = p_ptr->ref;
936 tipc_port_unlock(p_ptr);
940 int tipc_portimportance(u32 ref, unsigned int *importance)
942 struct tipc_port *p_ptr;
944 p_ptr = tipc_port_lock(ref);
947 *importance = (unsigned int)msg_importance(&p_ptr->phdr);
948 tipc_port_unlock(p_ptr);
952 int tipc_set_portimportance(u32 ref, unsigned int imp)
954 struct tipc_port *p_ptr;
956 if (imp > TIPC_CRITICAL_IMPORTANCE)
959 p_ptr = tipc_port_lock(ref);
962 msg_set_importance(&p_ptr->phdr, (u32)imp);
963 tipc_port_unlock(p_ptr);
968 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
970 struct tipc_port *p_ptr;
971 struct publication *publ;
975 p_ptr = tipc_port_lock(ref);
979 if (p_ptr->connected)
981 key = ref + p_ptr->pub_count + 1;
986 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
987 scope, p_ptr->ref, key);
989 list_add(&publ->pport_list, &p_ptr->publications);
991 p_ptr->published = 1;
995 tipc_port_unlock(p_ptr);
999 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1001 struct tipc_port *p_ptr;
1002 struct publication *publ;
1003 struct publication *tpubl;
1006 p_ptr = tipc_port_lock(ref);
1010 list_for_each_entry_safe(publ, tpubl,
1011 &p_ptr->publications, pport_list) {
1012 tipc_nametbl_withdraw(publ->type, publ->lower,
1013 publ->ref, publ->key);
1017 list_for_each_entry_safe(publ, tpubl,
1018 &p_ptr->publications, pport_list) {
1019 if (publ->scope != scope)
1021 if (publ->type != seq->type)
1023 if (publ->lower != seq->lower)
1025 if (publ->upper != seq->upper)
1027 tipc_nametbl_withdraw(publ->type, publ->lower,
1028 publ->ref, publ->key);
1033 if (list_empty(&p_ptr->publications))
1034 p_ptr->published = 0;
1035 tipc_port_unlock(p_ptr);
1039 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1041 struct tipc_port *p_ptr;
1042 struct tipc_msg *msg;
1045 p_ptr = tipc_port_lock(ref);
1048 if (p_ptr->published || p_ptr->connected)
1054 msg_set_destnode(msg, peer->node);
1055 msg_set_destport(msg, peer->ref);
1056 msg_set_type(msg, TIPC_CONN_MSG);
1057 msg_set_lookup_scope(msg, 0);
1058 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1060 p_ptr->probing_interval = PROBING_INTERVAL;
1061 p_ptr->probing_state = CONFIRMED;
1062 p_ptr->connected = 1;
1063 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1065 tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1066 (void *)(unsigned long)ref,
1067 (net_ev_handler)port_handle_node_down);
1070 tipc_port_unlock(p_ptr);
1071 p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1076 * tipc_disconnect_port - disconnect port from peer
1078 * Port must be locked.
1080 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1084 if (tp_ptr->connected) {
1085 tp_ptr->connected = 0;
1086 /* let timer expire on it's own to avoid deadlock! */
1087 tipc_nodesub_unsubscribe(&tp_ptr->subscription);
1096 * tipc_disconnect(): Disconnect port form peer.
1097 * This is a node local operation.
1099 int tipc_disconnect(u32 ref)
1101 struct tipc_port *p_ptr;
1104 p_ptr = tipc_port_lock(ref);
1107 res = tipc_disconnect_port(p_ptr);
1108 tipc_port_unlock(p_ptr);
1113 * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1115 int tipc_shutdown(u32 ref)
1117 struct tipc_port *p_ptr;
1118 struct sk_buff *buf = NULL;
1120 p_ptr = tipc_port_lock(ref);
1124 buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
1125 tipc_port_unlock(p_ptr);
1126 tipc_net_route_msg(buf);
1127 return tipc_disconnect(ref);
1131 * tipc_port_recv_msg - receive message from lower layer and deliver to port user
1133 int tipc_port_recv_msg(struct sk_buff *buf)
1135 struct tipc_port *p_ptr;
1136 struct tipc_msg *msg = buf_msg(buf);
1137 u32 destport = msg_destport(msg);
1138 u32 dsz = msg_data_sz(msg);
1141 /* forward unresolved named message */
1142 if (unlikely(!destport)) {
1143 tipc_net_route_msg(buf);
1147 /* validate destination & pass to port, otherwise reject message */
1148 p_ptr = tipc_port_lock(destport);
1149 if (likely(p_ptr)) {
1150 err = p_ptr->dispatcher(p_ptr, buf);
1151 tipc_port_unlock(p_ptr);
1155 err = TIPC_ERR_NO_PORT;
1158 return tipc_reject_msg(buf, err);
1162 * tipc_port_recv_sections(): Concatenate and deliver sectioned
1163 * message for this node.
1165 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1166 struct iovec const *msg_sect,
1167 unsigned int total_len)
1169 struct sk_buff *buf;
1172 res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1173 MAX_MSG_SIZE, !sender->user_port, &buf);
1175 tipc_port_recv_msg(buf);
1180 * tipc_send - send message sections on connection
1182 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1183 unsigned int total_len)
1185 struct tipc_port *p_ptr;
1189 p_ptr = tipc_port_deref(ref);
1190 if (!p_ptr || !p_ptr->connected)
1193 p_ptr->congested = 1;
1194 if (!tipc_port_congested(p_ptr)) {
1195 destnode = port_peernode(p_ptr);
1196 if (likely(!in_own_node(destnode)))
1197 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1198 total_len, destnode);
1200 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1203 if (likely(res != -ELINKCONG)) {
1204 p_ptr->congested = 0;
1210 if (port_unreliable(p_ptr)) {
1211 p_ptr->congested = 0;
1218 * tipc_send2name - send message sections to port name
1220 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1221 unsigned int num_sect, struct iovec const *msg_sect,
1222 unsigned int total_len)
1224 struct tipc_port *p_ptr;
1225 struct tipc_msg *msg;
1226 u32 destnode = domain;
1230 p_ptr = tipc_port_deref(ref);
1231 if (!p_ptr || p_ptr->connected)
1235 msg_set_type(msg, TIPC_NAMED_MSG);
1236 msg_set_hdr_sz(msg, NAMED_H_SIZE);
1237 msg_set_nametype(msg, name->type);
1238 msg_set_nameinst(msg, name->instance);
1239 msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1240 destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1241 msg_set_destnode(msg, destnode);
1242 msg_set_destport(msg, destport);
1244 if (likely(destport || destnode)) {
1245 if (likely(in_own_node(destnode)))
1246 res = tipc_port_recv_sections(p_ptr, num_sect,
1247 msg_sect, total_len);
1248 else if (tipc_own_addr)
1249 res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1250 num_sect, total_len,
1253 res = tipc_port_reject_sections(p_ptr, msg, msg_sect,
1254 num_sect, total_len,
1256 if (likely(res != -ELINKCONG)) {
1261 if (port_unreliable(p_ptr)) {
1266 return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1267 total_len, TIPC_ERR_NO_NAME);
1271 * tipc_send2port - send message sections to port identity
1273 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1274 unsigned int num_sect, struct iovec const *msg_sect,
1275 unsigned int total_len)
1277 struct tipc_port *p_ptr;
1278 struct tipc_msg *msg;
1281 p_ptr = tipc_port_deref(ref);
1282 if (!p_ptr || p_ptr->connected)
1286 msg_set_type(msg, TIPC_DIRECT_MSG);
1287 msg_set_lookup_scope(msg, 0);
1288 msg_set_destnode(msg, dest->node);
1289 msg_set_destport(msg, dest->ref);
1290 msg_set_hdr_sz(msg, BASIC_H_SIZE);
1292 if (in_own_node(dest->node))
1293 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1295 else if (tipc_own_addr)
1296 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1297 total_len, dest->node);
1299 res = tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1300 total_len, TIPC_ERR_NO_NODE);
1301 if (likely(res != -ELINKCONG)) {
1306 if (port_unreliable(p_ptr)) {
1313 * tipc_send_buf2port - send message buffer to port identity
1315 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1316 struct sk_buff *buf, unsigned int dsz)
1318 struct tipc_port *p_ptr;
1319 struct tipc_msg *msg;
1322 p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1323 if (!p_ptr || p_ptr->connected)
1327 msg_set_type(msg, TIPC_DIRECT_MSG);
1328 msg_set_destnode(msg, dest->node);
1329 msg_set_destport(msg, dest->ref);
1330 msg_set_hdr_sz(msg, BASIC_H_SIZE);
1331 msg_set_size(msg, BASIC_H_SIZE + dsz);
1332 if (skb_cow(buf, BASIC_H_SIZE))
1335 skb_push(buf, BASIC_H_SIZE);
1336 skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE);
1338 if (in_own_node(dest->node))
1339 res = tipc_port_recv_msg(buf);
1341 res = tipc_send_buf_fast(buf, dest->node);
1342 if (likely(res != -ELINKCONG)) {
1347 if (port_unreliable(p_ptr))