[TIPC] Initial merge

TIPC (Transparent Inter Process Communication) is a protocol designed for
intra cluster communication. For more information see
http://tipc.sourceforge.net

Signed-off-by: Per Liden <per.liden@nospam.ericsson.com>

1 files changed, 689 insertions, 0 deletions

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
new file mode 100644
index 000000000000..c19465c5f035
--- /dev/null
+++ b/net/tipc/bearer.c
@@ -0,0 +1,689 @@
+/*
+ * net/tipc/bearer.c: TIPC bearer code
+ * 
+ * Copyright (c) 2003-2005, Ericsson Research Canada
+ * Copyright (c) 2004-2005, Wind River Systems
+ * Copyright (c) 2005-2006, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this 
+ * list of conditions and the following disclaimer.
+ * 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.
+ * Neither the names of the copyright holders nor the names of its 
+ * contributors may be used to endorse or promote products derived from this 
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "config.h"
+#include "dbg.h"
+#include "bearer.h"
+#include "link.h"
+#include "port.h"
+#include "discover.h"
+#include "bcast.h"
+
+#define MAX_ADDR_STR 32
+
+static struct media *media_list = 0;
+static u32 media_count = 0;
+
+struct bearer *bearers = 0;
+
+/**
+ * media_name_valid - validate media name
+ * 
+ * Returns 1 if media name is valid, otherwise 0.
+ */
+
+static int media_name_valid(const char *name)
+{
+	u32 len;
+
+	len = strlen(name);
+	if ((len + 1) > TIPC_MAX_MEDIA_NAME)
+		return 0;
+	return (strspn(name, tipc_alphabet) == len);
+}
+
+/**
+ * media_find - locates specified media object by name
+ */
+
+static struct media *media_find(const char *name)
+{
+	struct media *m_ptr;
+	u32 i;
+
+	for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
+		if (!strcmp(m_ptr->name, name))
+			return m_ptr;
+	}
+	return 0;
+}
+
+/**
+ * tipc_register_media - register a media type
+ * 
+ * Bearers for this media type must be activated separately at a later stage.
+ */
+
+int  tipc_register_media(u32 media_type,
+			 char *name, 
+			 int (*enable)(struct tipc_bearer *), 
+			 void (*disable)(struct tipc_bearer *), 
+			 int (*send_msg)(struct sk_buff *, 
+					 struct tipc_bearer *,
+					 struct tipc_media_addr *), 
+			 char *(*addr2str)(struct tipc_media_addr *a,
+					   char *str_buf, int str_size),
+			 struct tipc_media_addr *bcast_addr,
+			 const u32 bearer_priority,
+			 const u32 link_tolerance,  /* [ms] */
+			 const u32 send_window_limit)
+{
+	struct media *m_ptr;
+	u32 media_id;
+	u32 i;
+	int res = -EINVAL;
+
+	write_lock_bh(&net_lock);
+	if (!media_list)
+		goto exit;
+
+	if (!media_name_valid(name)) {
+		warn("Media registration error: illegal name <%s>\n", name);
+		goto exit;
+	}
+	if (!bcast_addr) {
+		warn("Media registration error: no broadcast address supplied\n");
+		goto exit;
+	}
+	if (bearer_priority >= TIPC_NUM_LINK_PRI) {
+		warn("Media registration error: priority %u\n", bearer_priority);
+		goto exit;
+	}
+	if ((link_tolerance < TIPC_MIN_LINK_TOL) || 
+	    (link_tolerance > TIPC_MAX_LINK_TOL)) {
+		warn("Media registration error: tolerance %u\n", link_tolerance);
+		goto exit;
+	}
+
+	media_id = media_count++;
+	if (media_id >= MAX_MEDIA) {
+		warn("Attempt to register more than %u media\n", MAX_MEDIA);
+		media_count--;
+		goto exit;
+	}
+	for (i = 0; i < media_id; i++) {
+		if (media_list[i].type_id == media_type) {
+			warn("Attempt to register second media with type %u\n", 
+			     media_type);
+			media_count--;
+			goto exit;
+		}
+		if (!strcmp(name, media_list[i].name)) {
+			warn("Attempt to re-register media name <%s>\n", name);
+			media_count--;
+			goto exit;
+		}
+	}
+
+	m_ptr = &media_list[media_id];
+	m_ptr->type_id = media_type;
+	m_ptr->send_msg = send_msg;
+	m_ptr->enable_bearer = enable;
+	m_ptr->disable_bearer = disable;
+	m_ptr->addr2str = addr2str;
+	memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr));
+	m_ptr->bcast = 1;
+	strcpy(m_ptr->name, name);
+	m_ptr->priority = bearer_priority;
+	m_ptr->tolerance = link_tolerance;
+	m_ptr->window = send_window_limit;
+	dbg("Media <%s> registered\n", name);
+	res = 0;
+exit:
+	write_unlock_bh(&net_lock);
+	return res;
+}
+
+/**
+ * media_addr_printf - record media address in print buffer
+ */
+
+void media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
+{
+	struct media *m_ptr;
+	u32 media_type;
+	u32 i;
+
+	media_type = ntohl(a->type);
+	for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
+		if (m_ptr->type_id == media_type)
+			break;
+	}
+
+	if ((i < media_count) && (m_ptr->addr2str != NULL)) {
+		char addr_str[MAX_ADDR_STR];
+
+		tipc_printf(pb, "%s(%s) ", m_ptr->name, 
+			    m_ptr->addr2str(a, addr_str, sizeof(addr_str)));
+	} else {
+		unchar *addr = (unchar *)&a->dev_addr;
+
+		tipc_printf(pb, "UNKNOWN(%u):", media_type);
+		for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) {
+			tipc_printf(pb, "%02x ", addr[i]);
+		}
+	}
+}
+
+/**
+ * media_get_names - record names of registered media in buffer
+ */
+
+struct sk_buff *media_get_names(void)
+{
+	struct sk_buff *buf;
+	struct media *m_ptr;
+	int i;
+
+	buf = cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
+	if (!buf)
+		return NULL;
+
+	read_lock_bh(&net_lock);
+	for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
+		cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name, 
+			       strlen(m_ptr->name) + 1);
+	}
+	read_unlock_bh(&net_lock);
+	return buf;
+}
+
+/**
+ * bearer_name_validate - validate & (optionally) deconstruct bearer name
+ * @name - ptr to bearer name string
+ * @name_parts - ptr to area for bearer name components (or NULL if not needed)
+ * 
+ * Returns 1 if bearer name is valid, otherwise 0.
+ */
+
+static int bearer_name_validate(const char *name, 
+				struct bearer_name *name_parts)
+{
+	char name_copy[TIPC_MAX_BEARER_NAME];
+	char *media_name;
+	char *if_name;
+	u32 media_len;
+	u32 if_len;
+
+	/* copy bearer name & ensure length is OK */
+
+	name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
+	/* need above in case non-Posix strncpy() doesn't pad with nulls */
+	strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
+	if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
+		return 0;
+
+	/* ensure all component parts of bearer name are present */
+
+	media_name = name_copy;
+	if ((if_name = strchr(media_name, ':')) == NULL)
+		return 0;
+	*(if_name++) = 0;
+	media_len = if_name - media_name;
+	if_len = strlen(if_name) + 1;
+
+	/* validate component parts of bearer name */
+
+	if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || 
+	    (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) || 
+	    (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
+	    (strspn(if_name, tipc_alphabet) != (if_len - 1)))
+		return 0;
+
+	/* return bearer name components, if necessary */
+
+	if (name_parts) {
+		strcpy(name_parts->media_name, media_name);
+		strcpy(name_parts->if_name, if_name);
+	}
+	return 1;
+}
+
+/**
+ * bearer_find - locates bearer object with matching bearer name
+ */
+
+static struct bearer *bearer_find(const char *name)
+{
+	struct bearer *b_ptr;
+	u32 i;
+
+	for (i = 0, b_ptr = bearers; i < MAX_BEARERS; i++, b_ptr++) {
+		if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
+			return b_ptr;
+	}
+	return 0;
+}
+
+/**
+ * bearer_find - locates bearer object with matching interface name
+ */
+
+struct bearer *bearer_find_interface(const char *if_name)
+{
+	struct bearer *b_ptr;
+	char *b_if_name;
+	u32 i;
+
+	for (i = 0, b_ptr = bearers; i < MAX_BEARERS; i++, b_ptr++) {
+		if (!b_ptr->active)
+			continue;
+		b_if_name = strchr(b_ptr->publ.name, ':') + 1;
+		if (!strcmp(b_if_name, if_name))
+			return b_ptr;
+	}
+	return 0;
+}
+
+/**
+ * bearer_get_names - record names of bearers in buffer
+ */
+
+struct sk_buff *bearer_get_names(void)
+{
+	struct sk_buff *buf;
+	struct media *m_ptr;
+	struct bearer *b_ptr;
+	int i, j;
+
+	buf = cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
+	if (!buf)
+		return NULL;
+
+	read_lock_bh(&net_lock);
+	for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
+		for (j = 0; j < MAX_BEARERS; j++) {
+			b_ptr = &bearers[j];
+			if (b_ptr->active && (b_ptr->media == m_ptr)) {
+				cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, 
+					       b_ptr->publ.name, 
+					       strlen(b_ptr->publ.name) + 1);
+			}
+		}
+	}
+	read_unlock_bh(&net_lock);
+	return buf;
+}
+
+void bearer_add_dest(struct bearer *b_ptr, u32 dest)
+{
+	nmap_add(&b_ptr->nodes, dest);
+	disc_update_link_req(b_ptr->link_req);
+	bcbearer_sort();
+}
+
+void bearer_remove_dest(struct bearer *b_ptr, u32 dest)
+{
+	nmap_remove(&b_ptr->nodes, dest);
+	disc_update_link_req(b_ptr->link_req);
+	bcbearer_sort();
+}
+
+/*
+ * bearer_push(): Resolve bearer congestion. Force the waiting
+ * links to push out their unsent packets, one packet per link
+ * per iteration, until all packets are gone or congestion reoccurs.
+ * 'net_lock' is read_locked when this function is called
+ * bearer.lock must be taken before calling
+ * Returns binary true(1) ore false(0)
+ */
+static int bearer_push(struct bearer *b_ptr)
+{
+	u32 res = TIPC_OK;
+	struct link *ln, *tln;
+
+	if (b_ptr->publ.blocked)
+		return 0;
+
+	while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
+		list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
+			res = link_push_packet(ln);
+			if (res == PUSH_FAILED)
+				break;
+			if (res == PUSH_FINISHED)
+				list_move_tail(&ln->link_list, &b_ptr->links);
+		}
+	}
+	return list_empty(&b_ptr->cong_links);
+}
+
+void bearer_lock_push(struct bearer *b_ptr)
+{
+	int res;
+
+	spin_lock_bh(&b_ptr->publ.lock);
+	res = bearer_push(b_ptr);
+	spin_unlock_bh(&b_ptr->publ.lock);
+	if (res)
+		bcbearer_push();
+}
+
+
+/*
+ * Interrupt enabling new requests after bearer congestion or blocking:    
+ * See bearer_send().   
+ */
+void tipc_continue(struct tipc_bearer *tb_ptr)
+{
+	struct bearer *b_ptr = (struct bearer *)tb_ptr;
+
+	spin_lock_bh(&b_ptr->publ.lock);
+	b_ptr->continue_count++;
+	if (!list_empty(&b_ptr->cong_links))
+		k_signal((Handler)bearer_lock_push, (unsigned long)b_ptr);
+	b_ptr->publ.blocked = 0;
+	spin_unlock_bh(&b_ptr->publ.lock);
+}
+
+/*
+ * Schedule link for sending of messages after the bearer 
+ * has been deblocked by 'continue()'. This method is called 
+ * when somebody tries to send a message via this link while 
+ * the bearer is congested. 'net_lock' is in read_lock here
+ * bearer.lock is busy
+ */
+
+static void bearer_schedule_unlocked(struct bearer *b_ptr, struct link *l_ptr)
+{
+	list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
+}
+
+/*
+ * Schedule link for sending of messages after the bearer 
+ * has been deblocked by 'continue()'. This method is called 
+ * when somebody tries to send a message via this link while 
+ * the bearer is congested. 'net_lock' is in read_lock here,
+ * bearer.lock is free
+ */
+
+void bearer_schedule(struct bearer *b_ptr, struct link *l_ptr)
+{
+	spin_lock_bh(&b_ptr->publ.lock);
+	bearer_schedule_unlocked(b_ptr, l_ptr);
+	spin_unlock_bh(&b_ptr->publ.lock);
+}
+
+
+/*
+ * bearer_resolve_congestion(): Check if there is bearer congestion,
+ * and if there is, try to resolve it before returning.
+ * 'net_lock' is read_locked when this function is called
+ */
+int bearer_resolve_congestion(struct bearer *b_ptr, struct link *l_ptr)
+{
+	int res = 1;
+
+	if (list_empty(&b_ptr->cong_links))
+		return 1;
+	spin_lock_bh(&b_ptr->publ.lock);
+	if (!bearer_push(b_ptr)) {
+		bearer_schedule_unlocked(b_ptr, l_ptr);
+		res = 0;
+	}
+	spin_unlock_bh(&b_ptr->publ.lock);
+	return res;
+}
+
+
+/**
+ * tipc_enable_bearer - enable bearer with the given name
+ */              
+
+int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority)
+{
+	struct bearer *b_ptr;
+	struct media *m_ptr;
+	struct bearer_name b_name;
+	char addr_string[16];
+	u32 bearer_id;
+	u32 with_this_prio;
+	u32 i;
+	int res = -EINVAL;
+
+	if (tipc_mode != TIPC_NET_MODE)
+		return -ENOPROTOOPT;
+	if (!bearer_name_validate(name, &b_name) ||
+	    !addr_domain_valid(bcast_scope) ||
+	    !in_scope(bcast_scope, tipc_own_addr) ||
+	    (priority > TIPC_NUM_LINK_PRI))
+		return -EINVAL;
+
+	write_lock_bh(&net_lock);
+	if (!bearers)
+		goto failed;
+
+	m_ptr = media_find(b_name.media_name);
+	if (!m_ptr) {
+		warn("No media <%s>\n", b_name.media_name);
+		goto failed;
+	}
+	if (priority == TIPC_NUM_LINK_PRI)
+		priority = m_ptr->priority;
+
+restart:
+	bearer_id = MAX_BEARERS;
+	with_this_prio = 1;
+	for (i = MAX_BEARERS; i-- != 0; ) {
+		if (!bearers[i].active) {
+			bearer_id = i;
+			continue;
+		}
+		if (!strcmp(name, bearers[i].publ.name)) {
+			warn("Bearer <%s> already enabled\n", name);
+			goto failed;
+		}
+		if ((bearers[i].priority == priority) &&
+		    (++with_this_prio > 2)) {
+			if (priority-- == 0) {
+				warn("Third bearer <%s> with priority %u, unable to lower to %u\n",
+				     name, priority + 1, priority);
+				goto failed;
+			}
+			warn("Third bearer <%s> with priority %u, lowering to %u\n",
+			     name, priority + 1, priority);
+			goto restart;
+		}
+	}
+	if (bearer_id >= MAX_BEARERS) {
+		warn("Attempt to enable more than %d bearers\n", MAX_BEARERS);
+		goto failed;
+	}
+
+	b_ptr = &bearers[bearer_id];
+	memset(b_ptr, 0, sizeof(struct bearer));
+
+	strcpy(b_ptr->publ.name, name);
+	res = m_ptr->enable_bearer(&b_ptr->publ);
+	if (res) {
+		warn("Failed to enable bearer <%s>\n", name);
+		goto failed;
+	}
+
+	b_ptr->identity = bearer_id;
+	b_ptr->media = m_ptr;
+	b_ptr->net_plane = bearer_id + 'A';
+	b_ptr->active = 1;
+	b_ptr->detect_scope = bcast_scope;
+	b_ptr->priority = priority;
+	INIT_LIST_HEAD(&b_ptr->cong_links);
+	INIT_LIST_HEAD(&b_ptr->links);
+	if (m_ptr->bcast) {
+		b_ptr->link_req = disc_init_link_req(b_ptr, &m_ptr->bcast_addr,
+						     bcast_scope, 2);
+	}
+	b_ptr->publ.lock = SPIN_LOCK_UNLOCKED;
+	write_unlock_bh(&net_lock);
+	info("Enabled bearer <%s>, discovery domain %s\n",
+	     name, addr_string_fill(addr_string, bcast_scope));
+	return 0;
+failed:
+	write_unlock_bh(&net_lock);
+	return res;
+}
+
+/**
+ * tipc_block_bearer(): Block the bearer with the given name,
+ *                      and reset all its links
+ */
+
+int tipc_block_bearer(const char *name)
+{
+	struct bearer *b_ptr = 0;
+	struct link *l_ptr;
+	struct link *temp_l_ptr;
+
+	if (tipc_mode != TIPC_NET_MODE)
+		return -ENOPROTOOPT;
+
+	read_lock_bh(&net_lock);
+	b_ptr = bearer_find(name);
+	if (!b_ptr) {
+		warn("Attempt to block unknown bearer <%s>\n", name);
+		read_unlock_bh(&net_lock);
+		return -EINVAL;
+	}
+
+	spin_lock_bh(&b_ptr->publ.lock);
+	b_ptr->publ.blocked = 1;
+	list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
+		struct node *n_ptr = l_ptr->owner;
+
+		spin_lock_bh(&n_ptr->lock);
+		link_reset(l_ptr);
+		spin_unlock_bh(&n_ptr->lock);
+	}
+	spin_unlock_bh(&b_ptr->publ.lock);
+	read_unlock_bh(&net_lock);
+	info("Blocked bearer <%s>\n", name);
+	return TIPC_OK;
+}
+
+/**
+ * bearer_disable -
+ * 
+ * Note: This routine assumes caller holds net_lock.
+ */
+
+static int bearer_disable(const char *name)
+{
+	struct bearer *b_ptr;
+	struct link *l_ptr;
+	struct link *temp_l_ptr;
+
+	if (tipc_mode != TIPC_NET_MODE)
+		return -ENOPROTOOPT;
+
+	b_ptr = bearer_find(name);
+	if (!b_ptr) {
+		warn("Attempt to disable unknown bearer <%s>\n", name);
+		return -EINVAL;
+	}
+
+	disc_stop_link_req(b_ptr->link_req);
+	spin_lock_bh(&b_ptr->publ.lock);
+	b_ptr->link_req = NULL;
+	b_ptr->publ.blocked = 1;
+	if (b_ptr->media->disable_bearer) {
+		spin_unlock_bh(&b_ptr->publ.lock);
+		write_unlock_bh(&net_lock);
+		b_ptr->media->disable_bearer(&b_ptr->publ);
+		write_lock_bh(&net_lock);
+		spin_lock_bh(&b_ptr->publ.lock);
+	}
+	list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
+		link_delete(l_ptr);
+	}
+	spin_unlock_bh(&b_ptr->publ.lock);
+	info("Disabled bearer <%s>\n", name);
+	memset(b_ptr, 0, sizeof(struct bearer));
+	return TIPC_OK;
+}
+
+int tipc_disable_bearer(const char *name)
+{
+	int res;
+
+	write_lock_bh(&net_lock);
+	res = bearer_disable(name);
+	write_unlock_bh(&net_lock);
+	return res;
+}
+
+
+
+int bearer_init(void)
+{
+	int res;
+
+	write_lock_bh(&net_lock);
+	bearers = kmalloc(MAX_BEARERS * sizeof(struct bearer), GFP_ATOMIC);
+	media_list = kmalloc(MAX_MEDIA * sizeof(struct media), GFP_ATOMIC);
+	if (bearers && media_list) {
+		memset(bearers, 0, MAX_BEARERS * sizeof(struct bearer));
+		memset(media_list, 0, MAX_MEDIA * sizeof(struct media));
+		res = TIPC_OK;
+	} else {
+		kfree(bearers);
+		kfree(media_list);
+		bearers = 0;
+		media_list = 0;
+		res = -ENOMEM;
+	}
+	write_unlock_bh(&net_lock);
+	return res;
+}
+
+void bearer_stop(void)
+{
+	u32 i;
+
+	if (!bearers)
+		return;
+
+	for (i = 0; i < MAX_BEARERS; i++) {
+		if (bearers[i].active)
+			bearers[i].publ.blocked = 1;
+	}
+	for (i = 0; i < MAX_BEARERS; i++) {
+		if (bearers[i].active)
+			bearer_disable(bearers[i].publ.name);
+	}
+	kfree(bearers);
+	kfree(media_list);
+	bearers = 0;
+	media_list = 0;
+	media_count = 0;
+}
+
+