| /* |
| * net/tipc/bearer.c: TIPC bearer code |
| * |
| * Copyright (c) 1996-2006, Ericsson AB |
| * Copyright (c) 2004-2006, 2010-2011, 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 "bearer.h" |
| #include "discover.h" |
| |
| #define MAX_ADDR_STR 32 |
| |
| static struct media *media_list[MAX_MEDIA]; |
| static u32 media_count; |
| |
| struct tipc_bearer tipc_bearers[MAX_BEARERS]; |
| |
| static void bearer_disable(struct tipc_bearer *b_ptr); |
| |
| /** |
| * 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; |
| } |
| |
| /** |
| * tipc_media_find - locates specified media object by name |
| */ |
| |
| struct media *tipc_media_find(const char *name) |
| { |
| u32 i; |
| |
| for (i = 0; i < media_count; i++) { |
| if (!strcmp(media_list[i]->name, name)) |
| return media_list[i]; |
| } |
| return NULL; |
| } |
| |
| /** |
| * media_find_id - locates specified media object by type identifier |
| */ |
| |
| static struct media *media_find_id(u8 type) |
| { |
| u32 i; |
| |
| for (i = 0; i < media_count; i++) { |
| if (media_list[i]->type_id == type) |
| return media_list[i]; |
| } |
| return NULL; |
| } |
| |
| /** |
| * tipc_register_media - register a media type |
| * |
| * Bearers for this media type must be activated separately at a later stage. |
| */ |
| |
| int tipc_register_media(struct media *m_ptr) |
| { |
| int res = -EINVAL; |
| |
| write_lock_bh(&tipc_net_lock); |
| |
| if (!media_name_valid(m_ptr->name)) |
| goto exit; |
| if ((m_ptr->bcast_addr.media_id != m_ptr->type_id) || |
| !m_ptr->bcast_addr.broadcast) |
| goto exit; |
| if (m_ptr->priority > TIPC_MAX_LINK_PRI) |
| goto exit; |
| if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) || |
| (m_ptr->tolerance > TIPC_MAX_LINK_TOL)) |
| goto exit; |
| if (media_count >= MAX_MEDIA) |
| goto exit; |
| if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id)) |
| goto exit; |
| |
| media_list[media_count] = m_ptr; |
| media_count++; |
| res = 0; |
| exit: |
| write_unlock_bh(&tipc_net_lock); |
| if (res) |
| warn("Media <%s> registration error\n", m_ptr->name); |
| return res; |
| } |
| |
| /** |
| * tipc_media_addr_printf - record media address in print buffer |
| */ |
| |
| void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a) |
| { |
| char addr_str[MAX_ADDR_STR]; |
| struct media *m_ptr; |
| |
| m_ptr = media_find_id(a->media_id); |
| |
| if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str))) |
| tipc_printf(pb, "%s(%s)", m_ptr->name, addr_str); |
| else { |
| u32 i; |
| |
| tipc_printf(pb, "UNKNOWN(%u)", a->media_id); |
| for (i = 0; i < sizeof(a->value); i++) |
| tipc_printf(pb, "-%02x", a->value[i]); |
| } |
| } |
| |
| /** |
| * tipc_media_get_names - record names of registered media in buffer |
| */ |
| |
| struct sk_buff *tipc_media_get_names(void) |
| { |
| struct sk_buff *buf; |
| int i; |
| |
| buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME)); |
| if (!buf) |
| return NULL; |
| |
| read_lock_bh(&tipc_net_lock); |
| for (i = 0; i < media_count; i++) { |
| tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, |
| media_list[i]->name, |
| strlen(media_list[i]->name) + 1); |
| } |
| read_unlock_bh(&tipc_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_name = strchr(media_name, ':'); |
| if (if_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; |
| } |
| |
| /** |
| * tipc_bearer_find - locates bearer object with matching bearer name |
| */ |
| |
| struct tipc_bearer *tipc_bearer_find(const char *name) |
| { |
| struct tipc_bearer *b_ptr; |
| u32 i; |
| |
| for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
| if (b_ptr->active && (!strcmp(b_ptr->name, name))) |
| return b_ptr; |
| } |
| return NULL; |
| } |
| |
| /** |
| * tipc_bearer_find_interface - locates bearer object with matching interface name |
| */ |
| |
| struct tipc_bearer *tipc_bearer_find_interface(const char *if_name) |
| { |
| struct tipc_bearer *b_ptr; |
| char *b_if_name; |
| u32 i; |
| |
| for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { |
| if (!b_ptr->active) |
| continue; |
| b_if_name = strchr(b_ptr->name, ':') + 1; |
| if (!strcmp(b_if_name, if_name)) |
| return b_ptr; |
| } |
| return NULL; |
| } |
| |
| /** |
| * tipc_bearer_get_names - record names of bearers in buffer |
| */ |
| |
| struct sk_buff *tipc_bearer_get_names(void) |
| { |
| struct sk_buff *buf; |
| struct tipc_bearer *b_ptr; |
| int i, j; |
| |
| buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME)); |
| if (!buf) |
| return NULL; |
| |
| read_lock_bh(&tipc_net_lock); |
| for (i = 0; i < media_count; i++) { |
| for (j = 0; j < MAX_BEARERS; j++) { |
| b_ptr = &tipc_bearers[j]; |
| if (b_ptr->active && (b_ptr->media == media_list[i])) { |
| tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, |
| b_ptr->name, |
| strlen(b_ptr->name) + 1); |
| } |
| } |
| } |
| read_unlock_bh(&tipc_net_lock); |
| return buf; |
| } |
| |
| void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest) |
| { |
| tipc_nmap_add(&b_ptr->nodes, dest); |
| tipc_bcbearer_sort(); |
| tipc_disc_add_dest(b_ptr->link_req); |
| } |
| |
| void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest) |
| { |
| tipc_nmap_remove(&b_ptr->nodes, dest); |
| tipc_bcbearer_sort(); |
| tipc_disc_remove_dest(b_ptr->link_req); |
| } |
| |
| /* |
| * 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. |
| * 'tipc_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 tipc_bearer *b_ptr) |
| { |
| u32 res = 0; |
| struct link *ln, *tln; |
| |
| if (b_ptr->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 = tipc_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 tipc_bearer_lock_push(struct tipc_bearer *b_ptr) |
| { |
| spin_lock_bh(&b_ptr->lock); |
| bearer_push(b_ptr); |
| spin_unlock_bh(&b_ptr->lock); |
| } |
| |
| |
| /* |
| * Interrupt enabling new requests after bearer congestion or blocking: |
| * See bearer_send(). |
| */ |
| void tipc_continue(struct tipc_bearer *b_ptr) |
| { |
| spin_lock_bh(&b_ptr->lock); |
| if (!list_empty(&b_ptr->cong_links)) |
| tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr); |
| b_ptr->blocked = 0; |
| spin_unlock_bh(&b_ptr->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. 'tipc_net_lock' is in read_lock here |
| * bearer.lock is busy |
| */ |
| |
| static void tipc_bearer_schedule_unlocked(struct tipc_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. 'tipc_net_lock' is in read_lock here, |
| * bearer.lock is free |
| */ |
| |
| void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr) |
| { |
| spin_lock_bh(&b_ptr->lock); |
| tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
| spin_unlock_bh(&b_ptr->lock); |
| } |
| |
| |
| /* |
| * tipc_bearer_resolve_congestion(): Check if there is bearer congestion, |
| * and if there is, try to resolve it before returning. |
| * 'tipc_net_lock' is read_locked when this function is called |
| */ |
| int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr) |
| { |
| int res = 1; |
| |
| if (list_empty(&b_ptr->cong_links)) |
| return 1; |
| spin_lock_bh(&b_ptr->lock); |
| if (!bearer_push(b_ptr)) { |
| tipc_bearer_schedule_unlocked(b_ptr, l_ptr); |
| res = 0; |
| } |
| spin_unlock_bh(&b_ptr->lock); |
| return res; |
| } |
| |
| /** |
| * tipc_bearer_congested - determines if bearer is currently congested |
| */ |
| |
| int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr) |
| { |
| if (unlikely(b_ptr->blocked)) |
| return 1; |
| if (likely(list_empty(&b_ptr->cong_links))) |
| return 0; |
| return !tipc_bearer_resolve_congestion(b_ptr, l_ptr); |
| } |
| |
| /** |
| * tipc_enable_bearer - enable bearer with the given name |
| */ |
| |
| int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) |
| { |
| struct tipc_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) { |
| warn("Bearer <%s> rejected, not supported in standalone mode\n", |
| name); |
| return -ENOPROTOOPT; |
| } |
| if (!bearer_name_validate(name, &b_name)) { |
| warn("Bearer <%s> rejected, illegal name\n", name); |
| return -EINVAL; |
| } |
| if (tipc_addr_domain_valid(disc_domain) && |
| (disc_domain != tipc_own_addr)) { |
| if (tipc_in_scope(disc_domain, tipc_own_addr)) { |
| disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK; |
| res = 0; /* accept any node in own cluster */ |
| } else if (in_own_cluster(disc_domain)) |
| res = 0; /* accept specified node in own cluster */ |
| } |
| if (res) { |
| warn("Bearer <%s> rejected, illegal discovery domain\n", name); |
| return -EINVAL; |
| } |
| if ((priority < TIPC_MIN_LINK_PRI || |
| priority > TIPC_MAX_LINK_PRI) && |
| (priority != TIPC_MEDIA_LINK_PRI)) { |
| warn("Bearer <%s> rejected, illegal priority\n", name); |
| return -EINVAL; |
| } |
| |
| write_lock_bh(&tipc_net_lock); |
| |
| m_ptr = tipc_media_find(b_name.media_name); |
| if (!m_ptr) { |
| warn("Bearer <%s> rejected, media <%s> not registered\n", name, |
| b_name.media_name); |
| goto exit; |
| } |
| |
| if (priority == TIPC_MEDIA_LINK_PRI) |
| priority = m_ptr->priority; |
| |
| restart: |
| bearer_id = MAX_BEARERS; |
| with_this_prio = 1; |
| for (i = MAX_BEARERS; i-- != 0; ) { |
| if (!tipc_bearers[i].active) { |
| bearer_id = i; |
| continue; |
| } |
| if (!strcmp(name, tipc_bearers[i].name)) { |
| warn("Bearer <%s> rejected, already enabled\n", name); |
| goto exit; |
| } |
| if ((tipc_bearers[i].priority == priority) && |
| (++with_this_prio > 2)) { |
| if (priority-- == 0) { |
| warn("Bearer <%s> rejected, duplicate priority\n", |
| name); |
| goto exit; |
| } |
| warn("Bearer <%s> priority adjustment required %u->%u\n", |
| name, priority + 1, priority); |
| goto restart; |
| } |
| } |
| if (bearer_id >= MAX_BEARERS) { |
| warn("Bearer <%s> rejected, bearer limit reached (%u)\n", |
| name, MAX_BEARERS); |
| goto exit; |
| } |
| |
| b_ptr = &tipc_bearers[bearer_id]; |
| strcpy(b_ptr->name, name); |
| res = m_ptr->enable_bearer(b_ptr); |
| if (res) { |
| warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res); |
| goto exit; |
| } |
| |
| b_ptr->identity = bearer_id; |
| b_ptr->media = m_ptr; |
| b_ptr->tolerance = m_ptr->tolerance; |
| b_ptr->window = m_ptr->window; |
| b_ptr->net_plane = bearer_id + 'A'; |
| b_ptr->active = 1; |
| b_ptr->priority = priority; |
| INIT_LIST_HEAD(&b_ptr->cong_links); |
| INIT_LIST_HEAD(&b_ptr->links); |
| spin_lock_init(&b_ptr->lock); |
| |
| res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain); |
| if (res) { |
| bearer_disable(b_ptr); |
| warn("Bearer <%s> rejected, discovery object creation failed\n", |
| name); |
| goto exit; |
| } |
| info("Enabled bearer <%s>, discovery domain %s, priority %u\n", |
| name, tipc_addr_string_fill(addr_string, disc_domain), priority); |
| exit: |
| write_unlock_bh(&tipc_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 tipc_bearer *b_ptr = NULL; |
| struct link *l_ptr; |
| struct link *temp_l_ptr; |
| |
| read_lock_bh(&tipc_net_lock); |
| b_ptr = tipc_bearer_find(name); |
| if (!b_ptr) { |
| warn("Attempt to block unknown bearer <%s>\n", name); |
| read_unlock_bh(&tipc_net_lock); |
| return -EINVAL; |
| } |
| |
| info("Blocking bearer <%s>\n", name); |
| spin_lock_bh(&b_ptr->lock); |
| b_ptr->blocked = 1; |
| list_splice_init(&b_ptr->cong_links, &b_ptr->links); |
| list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
| struct tipc_node *n_ptr = l_ptr->owner; |
| |
| spin_lock_bh(&n_ptr->lock); |
| tipc_link_reset(l_ptr); |
| spin_unlock_bh(&n_ptr->lock); |
| } |
| spin_unlock_bh(&b_ptr->lock); |
| read_unlock_bh(&tipc_net_lock); |
| return 0; |
| } |
| |
| /** |
| * bearer_disable - |
| * |
| * Note: This routine assumes caller holds tipc_net_lock. |
| */ |
| |
| static void bearer_disable(struct tipc_bearer *b_ptr) |
| { |
| struct link *l_ptr; |
| struct link *temp_l_ptr; |
| |
| info("Disabling bearer <%s>\n", b_ptr->name); |
| spin_lock_bh(&b_ptr->lock); |
| b_ptr->blocked = 1; |
| b_ptr->media->disable_bearer(b_ptr); |
| list_splice_init(&b_ptr->cong_links, &b_ptr->links); |
| list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { |
| tipc_link_delete(l_ptr); |
| } |
| if (b_ptr->link_req) |
| tipc_disc_delete(b_ptr->link_req); |
| spin_unlock_bh(&b_ptr->lock); |
| memset(b_ptr, 0, sizeof(struct tipc_bearer)); |
| } |
| |
| int tipc_disable_bearer(const char *name) |
| { |
| struct tipc_bearer *b_ptr; |
| int res; |
| |
| write_lock_bh(&tipc_net_lock); |
| b_ptr = tipc_bearer_find(name); |
| if (b_ptr == NULL) { |
| warn("Attempt to disable unknown bearer <%s>\n", name); |
| res = -EINVAL; |
| } else { |
| bearer_disable(b_ptr); |
| res = 0; |
| } |
| write_unlock_bh(&tipc_net_lock); |
| return res; |
| } |
| |
| |
| |
| void tipc_bearer_stop(void) |
| { |
| u32 i; |
| |
| for (i = 0; i < MAX_BEARERS; i++) { |
| if (tipc_bearers[i].active) |
| bearer_disable(&tipc_bearers[i]); |
| } |
| media_count = 0; |
| } |