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-rw-r--r--net/tipc/bearer.c692
1 files changed, 692 insertions, 0 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
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+++ b/net/tipc/bearer.c
@@ -0,0 +1,692 @@
+/*
+ * net/tipc/bearer.c: TIPC bearer code
+ *
+ * Copyright (c) 1996-2006, Ericsson AB
+ * Copyright (c) 2004-2005, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. 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.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * 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;
+}
+
+
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