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 void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
586 struct publication *publ;
589 tipc_printf(buf, "<%u.%u.%u:%u>:",
590 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
591 tipc_node(tipc_own_addr), p_ptr->ref);
593 tipc_printf(buf, "%-10u:", p_ptr->ref);
595 if (p_ptr->connected) {
596 u32 dport = port_peerport(p_ptr);
597 u32 destnode = port_peernode(p_ptr);
599 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
600 tipc_zone(destnode), tipc_cluster(destnode),
601 tipc_node(destnode), dport);
602 if (p_ptr->conn_type != 0)
603 tipc_printf(buf, " via {%u,%u}",
605 p_ptr->conn_instance);
606 } else if (p_ptr->published) {
607 tipc_printf(buf, " bound to");
608 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
609 if (publ->lower == publ->upper)
610 tipc_printf(buf, " {%u,%u}", publ->type,
613 tipc_printf(buf, " {%u,%u,%u}", publ->type,
614 publ->lower, publ->upper);
617 tipc_printf(buf, "\n");
620 #define MAX_PORT_QUERY 32768
622 struct sk_buff *tipc_port_get_ports(void)
625 struct tlv_desc *rep_tlv;
627 struct tipc_port *p_ptr;
630 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
633 rep_tlv = (struct tlv_desc *)buf->data;
635 tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
636 spin_lock_bh(&tipc_port_list_lock);
637 list_for_each_entry(p_ptr, &ports, port_list) {
638 spin_lock_bh(p_ptr->lock);
639 port_print(p_ptr, &pb, 0);
640 spin_unlock_bh(p_ptr->lock);
642 spin_unlock_bh(&tipc_port_list_lock);
643 str_len = tipc_printbuf_validate(&pb);
645 skb_put(buf, TLV_SPACE(str_len));
646 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
651 void tipc_port_reinit(void)
653 struct tipc_port *p_ptr;
654 struct tipc_msg *msg;
656 spin_lock_bh(&tipc_port_list_lock);
657 list_for_each_entry(p_ptr, &ports, port_list) {
659 msg_set_prevnode(msg, tipc_own_addr);
660 msg_set_orignode(msg, tipc_own_addr);
662 spin_unlock_bh(&tipc_port_list_lock);
667 * port_dispatcher_sigh(): Signal handler for messages destinated
668 * to the tipc_port interface.
670 static void port_dispatcher_sigh(void *dummy)
674 spin_lock_bh(&queue_lock);
675 buf = msg_queue_head;
676 msg_queue_head = NULL;
677 spin_unlock_bh(&queue_lock);
680 struct tipc_port *p_ptr;
681 struct user_port *up_ptr;
682 struct tipc_portid orig;
683 struct tipc_name_seq dseq;
690 struct sk_buff *next = buf->next;
691 struct tipc_msg *msg = buf_msg(buf);
692 u32 dref = msg_destport(msg);
694 message_type = msg_type(msg);
695 if (message_type > TIPC_DIRECT_MSG)
696 goto reject; /* Unsupported message type */
698 p_ptr = tipc_port_lock(dref);
700 goto reject; /* Port deleted while msg in queue */
702 orig.ref = msg_origport(msg);
703 orig.node = msg_orignode(msg);
704 up_ptr = p_ptr->user_port;
705 usr_handle = up_ptr->usr_handle;
706 connected = p_ptr->connected;
707 peer_invalid = connected && !tipc_port_peer_msg(p_ptr, msg);
708 published = p_ptr->published;
710 if (unlikely(msg_errcode(msg)))
713 switch (message_type) {
716 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
719 tipc_port_unlock(p_ptr);
722 if (unlikely(!connected)) {
723 if (tipc_connect2port(dref, &orig))
725 } else if (peer_invalid)
727 dsz = msg_data_sz(msg);
729 (++p_ptr->conn_unacked >=
730 TIPC_FLOW_CONTROL_WIN)))
731 tipc_acknowledge(dref,
732 p_ptr->conn_unacked);
733 skb_pull(buf, msg_hdr_sz(msg));
734 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
737 case TIPC_DIRECT_MSG:{
738 tipc_msg_event cb = up_ptr->msg_cb;
740 tipc_port_unlock(p_ptr);
741 if (unlikely(!cb || connected))
743 skb_pull(buf, msg_hdr_sz(msg));
744 cb(usr_handle, dref, &buf, msg_data(msg),
745 msg_data_sz(msg), msg_importance(msg),
750 case TIPC_NAMED_MSG:{
751 tipc_named_msg_event cb = up_ptr->named_msg_cb;
753 tipc_port_unlock(p_ptr);
754 if (unlikely(!cb || connected || !published))
756 dseq.type = msg_nametype(msg);
757 dseq.lower = msg_nameinst(msg);
758 dseq.upper = (message_type == TIPC_NAMED_MSG)
759 ? dseq.lower : msg_nameupper(msg);
760 skb_pull(buf, msg_hdr_sz(msg));
761 cb(usr_handle, dref, &buf, msg_data(msg),
762 msg_data_sz(msg), msg_importance(msg),
772 switch (message_type) {
775 tipc_conn_shutdown_event cb =
778 tipc_port_unlock(p_ptr);
779 if (!cb || !connected || peer_invalid)
781 tipc_disconnect(dref);
782 skb_pull(buf, msg_hdr_sz(msg));
783 cb(usr_handle, dref, &buf, msg_data(msg),
784 msg_data_sz(msg), msg_errcode(msg));
787 case TIPC_DIRECT_MSG:{
788 tipc_msg_err_event cb = up_ptr->err_cb;
790 tipc_port_unlock(p_ptr);
791 if (!cb || connected)
793 skb_pull(buf, msg_hdr_sz(msg));
794 cb(usr_handle, dref, &buf, msg_data(msg),
795 msg_data_sz(msg), msg_errcode(msg), &orig);
799 case TIPC_NAMED_MSG:{
800 tipc_named_msg_err_event cb =
801 up_ptr->named_err_cb;
803 tipc_port_unlock(p_ptr);
804 if (!cb || connected)
806 dseq.type = msg_nametype(msg);
807 dseq.lower = msg_nameinst(msg);
808 dseq.upper = (message_type == TIPC_NAMED_MSG)
809 ? dseq.lower : msg_nameupper(msg);
810 skb_pull(buf, msg_hdr_sz(msg));
811 cb(usr_handle, dref, &buf, msg_data(msg),
812 msg_data_sz(msg), msg_errcode(msg), &dseq);
821 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
827 * port_dispatcher(): Dispatcher for messages destinated
828 * to the tipc_port interface. Called with port locked.
830 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
833 spin_lock_bh(&queue_lock);
834 if (msg_queue_head) {
835 msg_queue_tail->next = buf;
836 msg_queue_tail = buf;
838 msg_queue_tail = msg_queue_head = buf;
839 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
841 spin_unlock_bh(&queue_lock);
846 * Wake up port after congestion: Called with port locked
848 static void port_wakeup_sh(unsigned long ref)
850 struct tipc_port *p_ptr;
851 struct user_port *up_ptr;
852 tipc_continue_event cb = NULL;
855 p_ptr = tipc_port_lock(ref);
857 up_ptr = p_ptr->user_port;
859 cb = up_ptr->continue_event_cb;
860 uh = up_ptr->usr_handle;
862 tipc_port_unlock(p_ptr);
869 static void port_wakeup(struct tipc_port *p_ptr)
871 tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
874 void tipc_acknowledge(u32 ref, u32 ack)
876 struct tipc_port *p_ptr;
877 struct sk_buff *buf = NULL;
879 p_ptr = tipc_port_lock(ref);
882 if (p_ptr->connected) {
883 p_ptr->conn_unacked -= ack;
884 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
886 tipc_port_unlock(p_ptr);
887 tipc_net_route_msg(buf);
891 * tipc_createport(): user level call.
893 int tipc_createport(void *usr_handle,
894 unsigned int importance,
895 tipc_msg_err_event error_cb,
896 tipc_named_msg_err_event named_error_cb,
897 tipc_conn_shutdown_event conn_error_cb,
898 tipc_msg_event msg_cb,
899 tipc_named_msg_event named_msg_cb,
900 tipc_conn_msg_event conn_msg_cb,
901 tipc_continue_event continue_event_cb, /* May be zero */
904 struct user_port *up_ptr;
905 struct tipc_port *p_ptr;
907 up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
909 pr_warn("Port creation failed, no memory\n");
912 p_ptr = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
919 p_ptr->user_port = up_ptr;
920 up_ptr->usr_handle = usr_handle;
921 up_ptr->ref = p_ptr->ref;
922 up_ptr->err_cb = error_cb;
923 up_ptr->named_err_cb = named_error_cb;
924 up_ptr->conn_err_cb = conn_error_cb;
925 up_ptr->msg_cb = msg_cb;
926 up_ptr->named_msg_cb = named_msg_cb;
927 up_ptr->conn_msg_cb = conn_msg_cb;
928 up_ptr->continue_event_cb = continue_event_cb;
929 *portref = p_ptr->ref;
930 tipc_port_unlock(p_ptr);
934 int tipc_portimportance(u32 ref, unsigned int *importance)
936 struct tipc_port *p_ptr;
938 p_ptr = tipc_port_lock(ref);
941 *importance = (unsigned int)msg_importance(&p_ptr->phdr);
942 tipc_port_unlock(p_ptr);
946 int tipc_set_portimportance(u32 ref, unsigned int imp)
948 struct tipc_port *p_ptr;
950 if (imp > TIPC_CRITICAL_IMPORTANCE)
953 p_ptr = tipc_port_lock(ref);
956 msg_set_importance(&p_ptr->phdr, (u32)imp);
957 tipc_port_unlock(p_ptr);
962 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
964 struct tipc_port *p_ptr;
965 struct publication *publ;
969 p_ptr = tipc_port_lock(ref);
973 if (p_ptr->connected)
975 key = ref + p_ptr->pub_count + 1;
980 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
981 scope, p_ptr->ref, key);
983 list_add(&publ->pport_list, &p_ptr->publications);
985 p_ptr->published = 1;
989 tipc_port_unlock(p_ptr);
993 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
995 struct tipc_port *p_ptr;
996 struct publication *publ;
997 struct publication *tpubl;
1000 p_ptr = tipc_port_lock(ref);
1004 list_for_each_entry_safe(publ, tpubl,
1005 &p_ptr->publications, pport_list) {
1006 tipc_nametbl_withdraw(publ->type, publ->lower,
1007 publ->ref, publ->key);
1011 list_for_each_entry_safe(publ, tpubl,
1012 &p_ptr->publications, pport_list) {
1013 if (publ->scope != scope)
1015 if (publ->type != seq->type)
1017 if (publ->lower != seq->lower)
1019 if (publ->upper != seq->upper)
1021 tipc_nametbl_withdraw(publ->type, publ->lower,
1022 publ->ref, publ->key);
1027 if (list_empty(&p_ptr->publications))
1028 p_ptr->published = 0;
1029 tipc_port_unlock(p_ptr);
1033 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1035 struct tipc_port *p_ptr;
1036 struct tipc_msg *msg;
1039 p_ptr = tipc_port_lock(ref);
1042 if (p_ptr->published || p_ptr->connected)
1048 msg_set_destnode(msg, peer->node);
1049 msg_set_destport(msg, peer->ref);
1050 msg_set_type(msg, TIPC_CONN_MSG);
1051 msg_set_lookup_scope(msg, 0);
1052 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1054 p_ptr->probing_interval = PROBING_INTERVAL;
1055 p_ptr->probing_state = CONFIRMED;
1056 p_ptr->connected = 1;
1057 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1059 tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1060 (void *)(unsigned long)ref,
1061 (net_ev_handler)port_handle_node_down);
1064 tipc_port_unlock(p_ptr);
1065 p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1070 * tipc_disconnect_port - disconnect port from peer
1072 * Port must be locked.
1074 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1078 if (tp_ptr->connected) {
1079 tp_ptr->connected = 0;
1080 /* let timer expire on it's own to avoid deadlock! */
1081 tipc_nodesub_unsubscribe(&tp_ptr->subscription);
1090 * tipc_disconnect(): Disconnect port form peer.
1091 * This is a node local operation.
1093 int tipc_disconnect(u32 ref)
1095 struct tipc_port *p_ptr;
1098 p_ptr = tipc_port_lock(ref);
1101 res = tipc_disconnect_port(p_ptr);
1102 tipc_port_unlock(p_ptr);
1107 * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1109 int tipc_shutdown(u32 ref)
1111 struct tipc_port *p_ptr;
1112 struct sk_buff *buf = NULL;
1114 p_ptr = tipc_port_lock(ref);
1118 buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
1119 tipc_port_unlock(p_ptr);
1120 tipc_net_route_msg(buf);
1121 return tipc_disconnect(ref);
1125 * tipc_port_recv_msg - receive message from lower layer and deliver to port user
1127 int tipc_port_recv_msg(struct sk_buff *buf)
1129 struct tipc_port *p_ptr;
1130 struct tipc_msg *msg = buf_msg(buf);
1131 u32 destport = msg_destport(msg);
1132 u32 dsz = msg_data_sz(msg);
1135 /* forward unresolved named message */
1136 if (unlikely(!destport)) {
1137 tipc_net_route_msg(buf);
1141 /* validate destination & pass to port, otherwise reject message */
1142 p_ptr = tipc_port_lock(destport);
1143 if (likely(p_ptr)) {
1144 err = p_ptr->dispatcher(p_ptr, buf);
1145 tipc_port_unlock(p_ptr);
1149 err = TIPC_ERR_NO_PORT;
1152 return tipc_reject_msg(buf, err);
1156 * tipc_port_recv_sections(): Concatenate and deliver sectioned
1157 * message for this node.
1159 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1160 struct iovec const *msg_sect,
1161 unsigned int total_len)
1163 struct sk_buff *buf;
1166 res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1167 MAX_MSG_SIZE, !sender->user_port, &buf);
1169 tipc_port_recv_msg(buf);
1174 * tipc_send - send message sections on connection
1176 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1177 unsigned int total_len)
1179 struct tipc_port *p_ptr;
1183 p_ptr = tipc_port_deref(ref);
1184 if (!p_ptr || !p_ptr->connected)
1187 p_ptr->congested = 1;
1188 if (!tipc_port_congested(p_ptr)) {
1189 destnode = port_peernode(p_ptr);
1190 if (likely(!in_own_node(destnode)))
1191 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1192 total_len, destnode);
1194 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1197 if (likely(res != -ELINKCONG)) {
1198 p_ptr->congested = 0;
1204 if (port_unreliable(p_ptr)) {
1205 p_ptr->congested = 0;
1212 * tipc_send2name - send message sections to port name
1214 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1215 unsigned int num_sect, struct iovec const *msg_sect,
1216 unsigned int total_len)
1218 struct tipc_port *p_ptr;
1219 struct tipc_msg *msg;
1220 u32 destnode = domain;
1224 p_ptr = tipc_port_deref(ref);
1225 if (!p_ptr || p_ptr->connected)
1229 msg_set_type(msg, TIPC_NAMED_MSG);
1230 msg_set_hdr_sz(msg, NAMED_H_SIZE);
1231 msg_set_nametype(msg, name->type);
1232 msg_set_nameinst(msg, name->instance);
1233 msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1234 destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1235 msg_set_destnode(msg, destnode);
1236 msg_set_destport(msg, destport);
1238 if (likely(destport || destnode)) {
1239 if (likely(in_own_node(destnode)))
1240 res = tipc_port_recv_sections(p_ptr, num_sect,
1241 msg_sect, total_len);
1242 else if (tipc_own_addr)
1243 res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1244 num_sect, total_len,
1247 res = tipc_port_reject_sections(p_ptr, msg, msg_sect,
1248 num_sect, total_len,
1250 if (likely(res != -ELINKCONG)) {
1255 if (port_unreliable(p_ptr)) {
1260 return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1261 total_len, TIPC_ERR_NO_NAME);
1265 * tipc_send2port - send message sections to port identity
1267 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1268 unsigned int num_sect, struct iovec const *msg_sect,
1269 unsigned int total_len)
1271 struct tipc_port *p_ptr;
1272 struct tipc_msg *msg;
1275 p_ptr = tipc_port_deref(ref);
1276 if (!p_ptr || p_ptr->connected)
1280 msg_set_type(msg, TIPC_DIRECT_MSG);
1281 msg_set_lookup_scope(msg, 0);
1282 msg_set_destnode(msg, dest->node);
1283 msg_set_destport(msg, dest->ref);
1284 msg_set_hdr_sz(msg, BASIC_H_SIZE);
1286 if (in_own_node(dest->node))
1287 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1289 else if (tipc_own_addr)
1290 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1291 total_len, dest->node);
1293 res = tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1294 total_len, TIPC_ERR_NO_NODE);
1295 if (likely(res != -ELINKCONG)) {
1300 if (port_unreliable(p_ptr)) {
1307 * tipc_send_buf2port - send message buffer to port identity
1309 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1310 struct sk_buff *buf, unsigned int dsz)
1312 struct tipc_port *p_ptr;
1313 struct tipc_msg *msg;
1316 p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1317 if (!p_ptr || p_ptr->connected)
1321 msg_set_type(msg, TIPC_DIRECT_MSG);
1322 msg_set_destnode(msg, dest->node);
1323 msg_set_destport(msg, dest->ref);
1324 msg_set_hdr_sz(msg, BASIC_H_SIZE);
1325 msg_set_size(msg, BASIC_H_SIZE + dsz);
1326 if (skb_cow(buf, BASIC_H_SIZE))
1329 skb_push(buf, BASIC_H_SIZE);
1330 skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE);
1332 if (in_own_node(dest->node))
1333 res = tipc_port_recv_msg(buf);
1335 res = tipc_send_buf_fast(buf, dest->node);
1336 if (likely(res != -ELINKCONG)) {
1341 if (port_unreliable(p_ptr))