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-rw-r--r--net/tipc/bearer.c629
1 files changed, 629 insertions, 0 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
new file mode 100644
index 00000000000..264474394f9
--- /dev/null
+++ b/net/tipc/bearer.c
@@ -0,0 +1,629 @@
+/*
+ * net/tipc/bearer.c: TIPC bearer code
+ *
+ * Copyright (c) 1996-2006, 2013, Ericsson AB
+ * Copyright (c) 2004-2006, 2010-2013, 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 60
+
+static struct tipc_media * const media_info_array[] = {
+ &eth_media_info,
+#ifdef CONFIG_TIPC_MEDIA_IB
+ &ib_media_info,
+#endif
+ NULL
+};
+
+struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
+
+static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down);
+
+/**
+ * tipc_media_find - locates specified media object by name
+ */
+struct tipc_media *tipc_media_find(const char *name)
+{
+ u32 i;
+
+ for (i = 0; media_info_array[i] != NULL; i++) {
+ if (!strcmp(media_info_array[i]->name, name))
+ break;
+ }
+ return media_info_array[i];
+}
+
+/**
+ * media_find_id - locates specified media object by type identifier
+ */
+static struct tipc_media *media_find_id(u8 type)
+{
+ u32 i;
+
+ for (i = 0; media_info_array[i] != NULL; i++) {
+ if (media_info_array[i]->type_id == type)
+ break;
+ }
+ return media_info_array[i];
+}
+
+/**
+ * tipc_media_addr_printf - record media address in print buffer
+ */
+void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
+{
+ char addr_str[MAX_ADDR_STR];
+ struct tipc_media *m_ptr;
+ int ret;
+
+ m_ptr = media_find_id(a->media_id);
+
+ if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
+ ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
+ else {
+ u32 i;
+
+ ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
+ for (i = 0; i < sizeof(a->value); i++)
+ ret += tipc_snprintf(buf - ret, len + ret,
+ "-%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;
+
+ for (i = 0; media_info_array[i] != NULL; i++) {
+ tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
+ media_info_array[i]->name,
+ strlen(media_info_array[i]->name) + 1);
+ }
+ 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 tipc_bearer_names *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))
+ 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; i < MAX_BEARERS; i++) {
+ b_ptr = rtnl_dereference(bearer_list[i]);
+ if (b_ptr && (!strcmp(b_ptr->name, 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;
+ int i, j;
+
+ buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
+ if (!buf)
+ return NULL;
+
+ for (i = 0; media_info_array[i] != NULL; i++) {
+ for (j = 0; j < MAX_BEARERS; j++) {
+ b = rtnl_dereference(bearer_list[j]);
+ if (!b)
+ continue;
+ if (b->media == media_info_array[i]) {
+ tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
+ b->name,
+ strlen(b->name) + 1);
+ }
+ }
+ }
+ return buf;
+}
+
+void tipc_bearer_add_dest(u32 bearer_id, u32 dest)
+{
+ struct tipc_bearer *b_ptr;
+
+ rcu_read_lock();
+ b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
+ if (b_ptr) {
+ tipc_bcbearer_sort(&b_ptr->nodes, dest, true);
+ tipc_disc_add_dest(b_ptr->link_req);
+ }
+ rcu_read_unlock();
+}
+
+void tipc_bearer_remove_dest(u32 bearer_id, u32 dest)
+{
+ struct tipc_bearer *b_ptr;
+
+ rcu_read_lock();
+ b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
+ if (b_ptr) {
+ tipc_bcbearer_sort(&b_ptr->nodes, dest, false);
+ tipc_disc_remove_dest(b_ptr->link_req);
+ }
+ rcu_read_unlock();
+}
+
+/**
+ * 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 tipc_media *m_ptr;
+ struct tipc_bearer_names b_names;
+ char addr_string[16];
+ u32 bearer_id;
+ u32 with_this_prio;
+ u32 i;
+ int res = -EINVAL;
+
+ if (!tipc_own_addr) {
+ pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
+ name);
+ return -ENOPROTOOPT;
+ }
+ if (!bearer_name_validate(name, &b_names)) {
+ pr_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_exact(disc_domain))
+ res = 0; /* accept specified node in own cluster */
+ }
+ if (res) {
+ pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
+ name);
+ return -EINVAL;
+ }
+ if ((priority > TIPC_MAX_LINK_PRI) &&
+ (priority != TIPC_MEDIA_LINK_PRI)) {
+ pr_warn("Bearer <%s> rejected, illegal priority\n", name);
+ return -EINVAL;
+ }
+
+ m_ptr = tipc_media_find(b_names.media_name);
+ if (!m_ptr) {
+ pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
+ name, b_names.media_name);
+ return -EINVAL;
+ }
+
+ 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; ) {
+ b_ptr = rtnl_dereference(bearer_list[i]);
+ if (!b_ptr) {
+ bearer_id = i;
+ continue;
+ }
+ if (!strcmp(name, b_ptr->name)) {
+ pr_warn("Bearer <%s> rejected, already enabled\n",
+ name);
+ return -EINVAL;
+ }
+ if ((b_ptr->priority == priority) &&
+ (++with_this_prio > 2)) {
+ if (priority-- == 0) {
+ pr_warn("Bearer <%s> rejected, duplicate priority\n",
+ name);
+ return -EINVAL;
+ }
+ pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
+ name, priority + 1, priority);
+ goto restart;
+ }
+ }
+ if (bearer_id >= MAX_BEARERS) {
+ pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
+ name, MAX_BEARERS);
+ return -EINVAL;
+ }
+
+ b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
+ if (!b_ptr)
+ return -ENOMEM;
+
+ strcpy(b_ptr->name, name);
+ b_ptr->media = m_ptr;
+ res = m_ptr->enable_media(b_ptr);
+ if (res) {
+ pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
+ name, -res);
+ return -EINVAL;
+ }
+
+ b_ptr->identity = bearer_id;
+ b_ptr->tolerance = m_ptr->tolerance;
+ b_ptr->window = m_ptr->window;
+ b_ptr->domain = disc_domain;
+ b_ptr->net_plane = bearer_id + 'A';
+ b_ptr->priority = priority;
+
+ res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr);
+ if (res) {
+ bearer_disable(b_ptr, false);
+ pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
+ name);
+ return -EINVAL;
+ }
+
+ rcu_assign_pointer(bearer_list[bearer_id], b_ptr);
+
+ pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
+ name,
+ tipc_addr_string_fill(addr_string, disc_domain), priority);
+ return res;
+}
+
+/**
+ * tipc_reset_bearer - Reset all links established over this bearer
+ */
+static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
+{
+ pr_info("Resetting bearer <%s>\n", b_ptr->name);
+ tipc_link_reset_list(b_ptr->identity);
+ tipc_disc_reset(b_ptr);
+ return 0;
+}
+
+/**
+ * bearer_disable
+ *
+ * Note: This routine assumes caller holds RTNL lock.
+ */
+static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
+{
+ u32 i;
+
+ pr_info("Disabling bearer <%s>\n", b_ptr->name);
+ b_ptr->media->disable_media(b_ptr);
+
+ tipc_link_delete_list(b_ptr->identity, shutting_down);
+ if (b_ptr->link_req)
+ tipc_disc_delete(b_ptr->link_req);
+
+ for (i = 0; i < MAX_BEARERS; i++) {
+ if (b_ptr == rtnl_dereference(bearer_list[i])) {
+ RCU_INIT_POINTER(bearer_list[i], NULL);
+ break;
+ }
+ }
+ kfree_rcu(b_ptr, rcu);
+}
+
+int tipc_disable_bearer(const char *name)
+{
+ struct tipc_bearer *b_ptr;
+ int res;
+
+ b_ptr = tipc_bearer_find(name);
+ if (b_ptr == NULL) {
+ pr_warn("Attempt to disable unknown bearer <%s>\n", name);
+ res = -EINVAL;
+ } else {
+ bearer_disable(b_ptr, false);
+ res = 0;
+ }
+ return res;
+}
+
+int tipc_enable_l2_media(struct tipc_bearer *b)
+{
+ struct net_device *dev;
+ char *driver_name = strchr((const char *)b->name, ':') + 1;
+
+ /* Find device with specified name */
+ dev = dev_get_by_name(&init_net, driver_name);
+ if (!dev)
+ return -ENODEV;
+
+ /* Associate TIPC bearer with L2 bearer */
+ rcu_assign_pointer(b->media_ptr, dev);
+ memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
+ memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
+ b->bcast_addr.media_id = b->media->type_id;
+ b->bcast_addr.broadcast = 1;
+ b->mtu = dev->mtu;
+ b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
+ rcu_assign_pointer(dev->tipc_ptr, b);
+ return 0;
+}
+
+/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
+ *
+ * Mark L2 bearer as inactive so that incoming buffers are thrown away,
+ * then get worker thread to complete bearer cleanup. (Can't do cleanup
+ * here because cleanup code needs to sleep and caller holds spinlocks.)
+ */
+void tipc_disable_l2_media(struct tipc_bearer *b)
+{
+ struct net_device *dev;
+
+ dev = (struct net_device *)rtnl_dereference(b->media_ptr);
+ RCU_INIT_POINTER(b->media_ptr, NULL);
+ RCU_INIT_POINTER(dev->tipc_ptr, NULL);
+ synchronize_net();
+ dev_put(dev);
+}
+
+/**
+ * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
+ * @buf: the packet to be sent
+ * @b_ptr: the bearer through which the packet is to be sent
+ * @dest: peer destination address
+ */
+int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
+ struct tipc_media_addr *dest)
+{
+ struct sk_buff *clone;
+ struct net_device *dev;
+ int delta;
+
+ dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
+ if (!dev)
+ return 0;
+
+ clone = skb_clone(buf, GFP_ATOMIC);
+ if (!clone)
+ return 0;
+
+ delta = dev->hard_header_len - skb_headroom(buf);
+ if ((delta > 0) &&
+ pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
+ kfree_skb(clone);
+ return 0;
+ }
+
+ skb_reset_network_header(clone);
+ clone->dev = dev;
+ clone->protocol = htons(ETH_P_TIPC);
+ dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
+ dev->dev_addr, clone->len);
+ dev_queue_xmit(clone);
+ return 0;
+}
+
+/* tipc_bearer_send- sends buffer to destination over bearer
+ *
+ * IMPORTANT:
+ * The media send routine must not alter the buffer being passed in
+ * as it may be needed for later retransmission!
+ */
+void tipc_bearer_send(u32 bearer_id, struct sk_buff *buf,
+ struct tipc_media_addr *dest)
+{
+ struct tipc_bearer *b_ptr;
+
+ rcu_read_lock();
+ b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]);
+ if (likely(b_ptr))
+ b_ptr->media->send_msg(buf, b_ptr, dest);
+ rcu_read_unlock();
+}
+
+/**
+ * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
+ * @buf: the received packet
+ * @dev: the net device that the packet was received on
+ * @pt: the packet_type structure which was used to register this handler
+ * @orig_dev: the original receive net device in case the device is a bond
+ *
+ * Accept only packets explicitly sent to this node, or broadcast packets;
+ * ignores packets sent using interface multicast, and traffic sent to other
+ * nodes (which can happen if interface is running in promiscuous mode).
+ */
+static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ struct tipc_bearer *b_ptr;
+
+ if (!net_eq(dev_net(dev), &init_net)) {
+ kfree_skb(buf);
+ return NET_RX_DROP;
+ }
+
+ rcu_read_lock();
+ b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
+ if (likely(b_ptr)) {
+ if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
+ buf->next = NULL;
+ tipc_rcv(buf, b_ptr);
+ rcu_read_unlock();
+ return NET_RX_SUCCESS;
+ }
+ }
+ rcu_read_unlock();
+
+ kfree_skb(buf);
+ return NET_RX_DROP;
+}
+
+/**
+ * tipc_l2_device_event - handle device events from network device
+ * @nb: the context of the notification
+ * @evt: the type of event
+ * @ptr: the net device that the event was on
+ *
+ * This function is called by the Ethernet driver in case of link
+ * change event.
+ */
+static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
+ void *ptr)
+{
+ struct tipc_bearer *b_ptr;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+ if (!net_eq(dev_net(dev), &init_net))
+ return NOTIFY_DONE;
+
+ b_ptr = rtnl_dereference(dev->tipc_ptr);
+ if (!b_ptr)
+ return NOTIFY_DONE;
+
+ b_ptr->mtu = dev->mtu;
+
+ switch (evt) {
+ case NETDEV_CHANGE:
+ if (netif_carrier_ok(dev))
+ break;
+ case NETDEV_DOWN:
+ case NETDEV_CHANGEMTU:
+ tipc_reset_bearer(b_ptr);
+ break;
+ case NETDEV_CHANGEADDR:
+ b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
+ (char *)dev->dev_addr);
+ tipc_reset_bearer(b_ptr);
+ break;
+ case NETDEV_UNREGISTER:
+ case NETDEV_CHANGENAME:
+ bearer_disable(b_ptr, false);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct packet_type tipc_packet_type __read_mostly = {
+ .type = htons(ETH_P_TIPC),
+ .func = tipc_l2_rcv_msg,
+};
+
+static struct notifier_block notifier = {
+ .notifier_call = tipc_l2_device_event,
+ .priority = 0,
+};
+
+int tipc_bearer_setup(void)
+{
+ int err;
+
+ err = register_netdevice_notifier(&notifier);
+ if (err)
+ return err;
+ dev_add_pack(&tipc_packet_type);
+ return 0;
+}
+
+void tipc_bearer_cleanup(void)
+{
+ unregister_netdevice_notifier(&notifier);
+ dev_remove_pack(&tipc_packet_type);
+}
+
+void tipc_bearer_stop(void)
+{
+ struct tipc_bearer *b_ptr;
+ u32 i;
+
+ for (i = 0; i < MAX_BEARERS; i++) {
+ b_ptr = rtnl_dereference(bearer_list[i]);
+ if (b_ptr) {
+ bearer_disable(b_ptr, true);
+ bearer_list[i] = NULL;
+ }
+ }
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 17:26:53 +0000