| /* |
| * net/tipc/bearer.c: TIPC bearer code |
| * |
| * Copyright (c) 1996-2006, 2013-2016, 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 <net/sock.h> |
| #include "core.h" |
| #include "bearer.h" |
| #include "link.h" |
| #include "discover.h" |
| #include "monitor.h" |
| #include "bcast.h" |
| #include "netlink.h" |
| #include "udp_media.h" |
| #include "trace.h" |
| #include "crypto.h" |
| |
| #define MAX_ADDR_STR 60 |
| |
| static struct tipc_media * const media_info_array[] = { |
| ð_media_info, |
| #ifdef CONFIG_TIPC_MEDIA_IB |
| &ib_media_info, |
| #endif |
| #ifdef CONFIG_TIPC_MEDIA_UDP |
| &udp_media_info, |
| #endif |
| NULL |
| }; |
| |
| static struct tipc_bearer *bearer_get(struct net *net, int bearer_id) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| |
| return rcu_dereference(tn->bearer_list[bearer_id]); |
| } |
| |
| static void bearer_disable(struct net *net, struct tipc_bearer *b); |
| static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *orig_dev); |
| |
| /** |
| * tipc_media_find - locates specified media object by name |
| * @name: name to locate |
| */ |
| 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 |
| * @type: type identifier to locate |
| */ |
| 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 |
| * @buf: output buffer |
| * @len: output buffer size remaining |
| * @a: input media address |
| */ |
| int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) |
| { |
| char addr_str[MAX_ADDR_STR]; |
| struct tipc_media *m; |
| int ret; |
| |
| m = media_find_id(a->media_id); |
| |
| if (m && !m->addr2str(a, addr_str, sizeof(addr_str))) |
| ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str); |
| else { |
| u32 i; |
| |
| ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id); |
| for (i = 0; i < sizeof(a->value); i++) |
| ret += scnprintf(buf + ret, len - ret, |
| "-%x", a->value[i]); |
| } |
| return ret; |
| } |
| |
| /** |
| * 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) |
| * |
| * Return: 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 */ |
| if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 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 |
| * @net: the applicable net namespace |
| * @name: bearer name to locate |
| */ |
| struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct tipc_bearer *b; |
| u32 i; |
| |
| for (i = 0; i < MAX_BEARERS; i++) { |
| b = rtnl_dereference(tn->bearer_list[i]); |
| if (b && (!strcmp(b->name, name))) |
| return b; |
| } |
| return NULL; |
| } |
| |
| /* tipc_bearer_get_name - get the bearer name from its id. |
| * @net: network namespace |
| * @name: a pointer to the buffer where the name will be stored. |
| * @bearer_id: the id to get the name from. |
| */ |
| int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| struct tipc_bearer *b; |
| |
| if (bearer_id >= MAX_BEARERS) |
| return -EINVAL; |
| |
| b = rtnl_dereference(tn->bearer_list[bearer_id]); |
| if (!b) |
| return -EINVAL; |
| |
| strcpy(name, b->name); |
| return 0; |
| } |
| |
| void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct tipc_bearer *b; |
| |
| rcu_read_lock(); |
| b = rcu_dereference(tn->bearer_list[bearer_id]); |
| if (b) |
| tipc_disc_add_dest(b->disc); |
| rcu_read_unlock(); |
| } |
| |
| void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct tipc_bearer *b; |
| |
| rcu_read_lock(); |
| b = rcu_dereference(tn->bearer_list[bearer_id]); |
| if (b) |
| tipc_disc_remove_dest(b->disc); |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * tipc_enable_bearer - enable bearer with the given name |
| * @net: the applicable net namespace |
| * @name: bearer name to enable |
| * @disc_domain: bearer domain |
| * @prio: bearer priority |
| * @attr: nlattr array |
| * @extack: netlink extended ack |
| */ |
| static int tipc_enable_bearer(struct net *net, const char *name, |
| u32 disc_domain, u32 prio, |
| struct nlattr *attr[], |
| struct netlink_ext_ack *extack) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| struct tipc_bearer_names b_names; |
| int with_this_prio = 1; |
| struct tipc_bearer *b; |
| struct tipc_media *m; |
| struct sk_buff *skb; |
| int bearer_id = 0; |
| int res = -EINVAL; |
| char *errstr = ""; |
| u32 i; |
| |
| if (!bearer_name_validate(name, &b_names)) { |
| NL_SET_ERR_MSG(extack, "Illegal name"); |
| return res; |
| } |
| |
| if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) { |
| errstr = "illegal priority"; |
| NL_SET_ERR_MSG(extack, "Illegal priority"); |
| goto rejected; |
| } |
| |
| m = tipc_media_find(b_names.media_name); |
| if (!m) { |
| errstr = "media not registered"; |
| NL_SET_ERR_MSG(extack, "Media not registered"); |
| goto rejected; |
| } |
| |
| if (prio == TIPC_MEDIA_LINK_PRI) |
| prio = m->priority; |
| |
| /* Check new bearer vs existing ones and find free bearer id if any */ |
| bearer_id = MAX_BEARERS; |
| i = MAX_BEARERS; |
| while (i-- != 0) { |
| b = rtnl_dereference(tn->bearer_list[i]); |
| if (!b) { |
| bearer_id = i; |
| continue; |
| } |
| if (!strcmp(name, b->name)) { |
| errstr = "already enabled"; |
| NL_SET_ERR_MSG(extack, "Already enabled"); |
| goto rejected; |
| } |
| |
| if (b->priority == prio && |
| (++with_this_prio > 2)) { |
| pr_warn("Bearer <%s>: already 2 bearers with priority %u\n", |
| name, prio); |
| |
| if (prio == TIPC_MIN_LINK_PRI) { |
| errstr = "cannot adjust to lower"; |
| NL_SET_ERR_MSG(extack, "Cannot adjust to lower"); |
| goto rejected; |
| } |
| |
| pr_warn("Bearer <%s>: trying with adjusted priority\n", |
| name); |
| prio--; |
| bearer_id = MAX_BEARERS; |
| i = MAX_BEARERS; |
| with_this_prio = 1; |
| } |
| } |
| |
| if (bearer_id >= MAX_BEARERS) { |
| errstr = "max 3 bearers permitted"; |
| NL_SET_ERR_MSG(extack, "Max 3 bearers permitted"); |
| goto rejected; |
| } |
| |
| b = kzalloc(sizeof(*b), GFP_ATOMIC); |
| if (!b) |
| return -ENOMEM; |
| |
| strcpy(b->name, name); |
| b->media = m; |
| res = m->enable_media(net, b, attr); |
| if (res) { |
| kfree(b); |
| errstr = "failed to enable media"; |
| NL_SET_ERR_MSG(extack, "Failed to enable media"); |
| goto rejected; |
| } |
| |
| b->identity = bearer_id; |
| b->tolerance = m->tolerance; |
| b->min_win = m->min_win; |
| b->max_win = m->max_win; |
| b->domain = disc_domain; |
| b->net_plane = bearer_id + 'A'; |
| b->priority = prio; |
| refcount_set(&b->refcnt, 1); |
| |
| res = tipc_disc_create(net, b, &b->bcast_addr, &skb); |
| if (res) { |
| bearer_disable(net, b); |
| errstr = "failed to create discoverer"; |
| NL_SET_ERR_MSG(extack, "Failed to create discoverer"); |
| goto rejected; |
| } |
| |
| /* Create monitoring data before accepting activate messages */ |
| if (tipc_mon_create(net, bearer_id)) { |
| bearer_disable(net, b); |
| kfree_skb(skb); |
| return -ENOMEM; |
| } |
| |
| test_and_set_bit_lock(0, &b->up); |
| rcu_assign_pointer(tn->bearer_list[bearer_id], b); |
| if (skb) |
| tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr); |
| |
| pr_info("Enabled bearer <%s>, priority %u\n", name, prio); |
| |
| return res; |
| rejected: |
| pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr); |
| return res; |
| } |
| |
| /** |
| * tipc_reset_bearer - Reset all links established over this bearer |
| * @net: the applicable net namespace |
| * @b: the target bearer |
| */ |
| static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b) |
| { |
| pr_info("Resetting bearer <%s>\n", b->name); |
| tipc_node_delete_links(net, b->identity); |
| tipc_disc_reset(net, b); |
| return 0; |
| } |
| |
| bool tipc_bearer_hold(struct tipc_bearer *b) |
| { |
| return (b && refcount_inc_not_zero(&b->refcnt)); |
| } |
| |
| void tipc_bearer_put(struct tipc_bearer *b) |
| { |
| if (b && refcount_dec_and_test(&b->refcnt)) |
| kfree_rcu(b, rcu); |
| } |
| |
| /** |
| * bearer_disable - disable this bearer |
| * @net: the applicable net namespace |
| * @b: the bearer to disable |
| * |
| * Note: This routine assumes caller holds RTNL lock. |
| */ |
| static void bearer_disable(struct net *net, struct tipc_bearer *b) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| int bearer_id = b->identity; |
| |
| pr_info("Disabling bearer <%s>\n", b->name); |
| clear_bit_unlock(0, &b->up); |
| tipc_node_delete_links(net, bearer_id); |
| b->media->disable_media(b); |
| RCU_INIT_POINTER(b->media_ptr, NULL); |
| if (b->disc) |
| tipc_disc_delete(b->disc); |
| RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL); |
| tipc_bearer_put(b); |
| tipc_mon_delete(net, bearer_id); |
| } |
| |
| int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b, |
| struct nlattr *attr[]) |
| { |
| char *dev_name = strchr((const char *)b->name, ':') + 1; |
| int hwaddr_len = b->media->hwaddr_len; |
| u8 node_id[NODE_ID_LEN] = {0,}; |
| struct net_device *dev; |
| |
| /* Find device with specified name */ |
| dev = dev_get_by_name(net, dev_name); |
| if (!dev) |
| return -ENODEV; |
| if (tipc_mtu_bad(dev, 0)) { |
| dev_put(dev); |
| return -EINVAL; |
| } |
| if (dev == net->loopback_dev) { |
| dev_put(dev); |
| pr_info("Enabling <%s> not permitted\n", b->name); |
| return -EINVAL; |
| } |
| |
| /* Autoconfigure own node identity if needed */ |
| if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) { |
| memcpy(node_id, dev->dev_addr, hwaddr_len); |
| tipc_net_init(net, node_id, 0); |
| } |
| if (!tipc_own_id(net)) { |
| dev_put(dev); |
| pr_warn("Failed to obtain node identity\n"); |
| return -EINVAL; |
| } |
| |
| /* Associate TIPC bearer with L2 bearer */ |
| rcu_assign_pointer(b->media_ptr, dev); |
| b->pt.dev = dev; |
| b->pt.type = htons(ETH_P_TIPC); |
| b->pt.func = tipc_l2_rcv_msg; |
| dev_add_pack(&b->pt); |
| memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); |
| memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len); |
| b->bcast_addr.media_id = b->media->type_id; |
| b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; |
| b->mtu = dev->mtu; |
| b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr); |
| rcu_assign_pointer(dev->tipc_ptr, b); |
| return 0; |
| } |
| |
| /* tipc_disable_l2_media - detach TIPC bearer from an L2 interface |
| * @b: the target bearer |
| * |
| * Mark L2 bearer as inactive so that incoming buffers are thrown away |
| */ |
| void tipc_disable_l2_media(struct tipc_bearer *b) |
| { |
| struct net_device *dev; |
| |
| dev = (struct net_device *)rtnl_dereference(b->media_ptr); |
| dev_remove_pack(&b->pt); |
| 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 |
| * @net: the associated network namespace |
| * @skb: the packet to be sent |
| * @b: the bearer through which the packet is to be sent |
| * @dest: peer destination address |
| */ |
| int tipc_l2_send_msg(struct net *net, struct sk_buff *skb, |
| struct tipc_bearer *b, struct tipc_media_addr *dest) |
| { |
| struct net_device *dev; |
| int delta; |
| |
| dev = (struct net_device *)rcu_dereference(b->media_ptr); |
| if (!dev) |
| return 0; |
| |
| delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); |
| if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) { |
| kfree_skb(skb); |
| return 0; |
| } |
| skb_reset_network_header(skb); |
| skb->dev = dev; |
| skb->protocol = htons(ETH_P_TIPC); |
| dev_hard_header(skb, dev, ETH_P_TIPC, dest->value, |
| dev->dev_addr, skb->len); |
| dev_queue_xmit(skb); |
| return 0; |
| } |
| |
| bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id) |
| { |
| bool supp = false; |
| struct tipc_bearer *b; |
| |
| rcu_read_lock(); |
| b = bearer_get(net, bearer_id); |
| if (b) |
| supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT); |
| rcu_read_unlock(); |
| return supp; |
| } |
| |
| int tipc_bearer_mtu(struct net *net, u32 bearer_id) |
| { |
| int mtu = 0; |
| struct tipc_bearer *b; |
| |
| rcu_read_lock(); |
| b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]); |
| if (b) |
| mtu = b->mtu; |
| rcu_read_unlock(); |
| return mtu; |
| } |
| |
| int tipc_bearer_min_mtu(struct net *net, u32 bearer_id) |
| { |
| int mtu = TIPC_MIN_BEARER_MTU; |
| struct tipc_bearer *b; |
| |
| rcu_read_lock(); |
| b = bearer_get(net, bearer_id); |
| if (b) |
| mtu += b->encap_hlen; |
| rcu_read_unlock(); |
| return mtu; |
| } |
| |
| /* tipc_bearer_xmit_skb - sends buffer to destination over bearer |
| */ |
| void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id, |
| struct sk_buff *skb, |
| struct tipc_media_addr *dest) |
| { |
| struct tipc_msg *hdr = buf_msg(skb); |
| struct tipc_bearer *b; |
| |
| rcu_read_lock(); |
| b = bearer_get(net, bearer_id); |
| if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) { |
| #ifdef CONFIG_TIPC_CRYPTO |
| tipc_crypto_xmit(net, &skb, b, dest, NULL); |
| if (skb) |
| #endif |
| b->media->send_msg(net, skb, b, dest); |
| } else { |
| kfree_skb(skb); |
| } |
| rcu_read_unlock(); |
| } |
| |
| /* tipc_bearer_xmit() -send buffer to destination over bearer |
| */ |
| void tipc_bearer_xmit(struct net *net, u32 bearer_id, |
| struct sk_buff_head *xmitq, |
| struct tipc_media_addr *dst, |
| struct tipc_node *__dnode) |
| { |
| struct tipc_bearer *b; |
| struct sk_buff *skb, *tmp; |
| |
| if (skb_queue_empty(xmitq)) |
| return; |
| |
| rcu_read_lock(); |
| b = bearer_get(net, bearer_id); |
| if (unlikely(!b)) |
| __skb_queue_purge(xmitq); |
| skb_queue_walk_safe(xmitq, skb, tmp) { |
| __skb_dequeue(xmitq); |
| if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) { |
| #ifdef CONFIG_TIPC_CRYPTO |
| tipc_crypto_xmit(net, &skb, b, dst, __dnode); |
| if (skb) |
| #endif |
| b->media->send_msg(net, skb, b, dst); |
| } else { |
| kfree_skb(skb); |
| } |
| } |
| rcu_read_unlock(); |
| } |
| |
| /* tipc_bearer_bc_xmit() - broadcast buffers to all destinations |
| */ |
| void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| struct tipc_media_addr *dst; |
| int net_id = tn->net_id; |
| struct tipc_bearer *b; |
| struct sk_buff *skb, *tmp; |
| struct tipc_msg *hdr; |
| |
| rcu_read_lock(); |
| b = bearer_get(net, bearer_id); |
| if (unlikely(!b || !test_bit(0, &b->up))) |
| __skb_queue_purge(xmitq); |
| skb_queue_walk_safe(xmitq, skb, tmp) { |
| hdr = buf_msg(skb); |
| msg_set_non_seq(hdr, 1); |
| msg_set_mc_netid(hdr, net_id); |
| __skb_dequeue(xmitq); |
| dst = &b->bcast_addr; |
| #ifdef CONFIG_TIPC_CRYPTO |
| tipc_crypto_xmit(net, &skb, b, dst, NULL); |
| if (skb) |
| #endif |
| b->media->send_msg(net, skb, b, dst); |
| } |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * tipc_l2_rcv_msg - handle incoming TIPC message from an interface |
| * @skb: the received message |
| * @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 *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *orig_dev) |
| { |
| struct tipc_bearer *b; |
| |
| rcu_read_lock(); |
| b = rcu_dereference(dev->tipc_ptr) ?: |
| rcu_dereference(orig_dev->tipc_ptr); |
| if (likely(b && test_bit(0, &b->up) && |
| (skb->pkt_type <= PACKET_MULTICAST))) { |
| skb_mark_not_on_list(skb); |
| TIPC_SKB_CB(skb)->flags = 0; |
| tipc_rcv(dev_net(b->pt.dev), skb, b); |
| rcu_read_unlock(); |
| return NET_RX_SUCCESS; |
| } |
| rcu_read_unlock(); |
| kfree_skb(skb); |
| 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 net_device *dev = netdev_notifier_info_to_dev(ptr); |
| struct net *net = dev_net(dev); |
| struct tipc_bearer *b; |
| |
| b = rtnl_dereference(dev->tipc_ptr); |
| if (!b) |
| return NOTIFY_DONE; |
| |
| trace_tipc_l2_device_event(dev, b, evt); |
| switch (evt) { |
| case NETDEV_CHANGE: |
| if (netif_carrier_ok(dev) && netif_oper_up(dev)) { |
| test_and_set_bit_lock(0, &b->up); |
| break; |
| } |
| fallthrough; |
| case NETDEV_GOING_DOWN: |
| clear_bit_unlock(0, &b->up); |
| tipc_reset_bearer(net, b); |
| break; |
| case NETDEV_UP: |
| test_and_set_bit_lock(0, &b->up); |
| break; |
| case NETDEV_CHANGEMTU: |
| if (tipc_mtu_bad(dev, 0)) { |
| bearer_disable(net, b); |
| break; |
| } |
| b->mtu = dev->mtu; |
| tipc_reset_bearer(net, b); |
| break; |
| case NETDEV_CHANGEADDR: |
| b->media->raw2addr(b, &b->addr, |
| (const char *)dev->dev_addr); |
| tipc_reset_bearer(net, b); |
| break; |
| case NETDEV_UNREGISTER: |
| case NETDEV_CHANGENAME: |
| bearer_disable(net, b); |
| break; |
| } |
| return NOTIFY_OK; |
| } |
| |
| static struct notifier_block notifier = { |
| .notifier_call = tipc_l2_device_event, |
| .priority = 0, |
| }; |
| |
| int tipc_bearer_setup(void) |
| { |
| return register_netdevice_notifier(¬ifier); |
| } |
| |
| void tipc_bearer_cleanup(void) |
| { |
| unregister_netdevice_notifier(¬ifier); |
| } |
| |
| void tipc_bearer_stop(struct net *net) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct tipc_bearer *b; |
| u32 i; |
| |
| for (i = 0; i < MAX_BEARERS; i++) { |
| b = rtnl_dereference(tn->bearer_list[i]); |
| if (b) { |
| bearer_disable(net, b); |
| tn->bearer_list[i] = NULL; |
| } |
| } |
| } |
| |
| void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts) |
| { |
| struct net_device *dev = net->loopback_dev; |
| struct sk_buff *skb, *_skb; |
| int exp; |
| |
| skb_queue_walk(pkts, _skb) { |
| skb = pskb_copy(_skb, GFP_ATOMIC); |
| if (!skb) |
| continue; |
| |
| exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb)); |
| if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) { |
| kfree_skb(skb); |
| continue; |
| } |
| |
| skb_reset_network_header(skb); |
| dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr, |
| dev->dev_addr, skb->len); |
| skb->dev = dev; |
| skb->pkt_type = PACKET_HOST; |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| skb->protocol = eth_type_trans(skb, dev); |
| netif_rx(skb); |
| } |
| } |
| |
| static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *od) |
| { |
| consume_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| int tipc_attach_loopback(struct net *net) |
| { |
| struct net_device *dev = net->loopback_dev; |
| struct tipc_net *tn = tipc_net(net); |
| |
| if (!dev) |
| return -ENODEV; |
| |
| netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL); |
| tn->loopback_pt.dev = dev; |
| tn->loopback_pt.type = htons(ETH_P_TIPC); |
| tn->loopback_pt.func = tipc_loopback_rcv_pkt; |
| dev_add_pack(&tn->loopback_pt); |
| return 0; |
| } |
| |
| void tipc_detach_loopback(struct net *net) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| |
| dev_remove_pack(&tn->loopback_pt); |
| netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker); |
| } |
| |
| /* Caller should hold rtnl_lock to protect the bearer */ |
| static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg, |
| struct tipc_bearer *bearer, int nlflags) |
| { |
| void *hdr; |
| struct nlattr *attrs; |
| struct nlattr *prop; |
| |
| hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| nlflags, TIPC_NL_BEARER_GET); |
| if (!hdr) |
| return -EMSGSIZE; |
| |
| attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER); |
| if (!attrs) |
| goto msg_full; |
| |
| if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name)) |
| goto attr_msg_full; |
| |
| prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP); |
| if (!prop) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win)) |
| goto prop_msg_full; |
| if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu)) |
| goto prop_msg_full; |
| |
| nla_nest_end(msg->skb, prop); |
| |
| #ifdef CONFIG_TIPC_MEDIA_UDP |
| if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) { |
| if (tipc_udp_nl_add_bearer_data(msg, bearer)) |
| goto attr_msg_full; |
| } |
| #endif |
| |
| nla_nest_end(msg->skb, attrs); |
| genlmsg_end(msg->skb, hdr); |
| |
| return 0; |
| |
| prop_msg_full: |
| nla_nest_cancel(msg->skb, prop); |
| attr_msg_full: |
| nla_nest_cancel(msg->skb, attrs); |
| msg_full: |
| genlmsg_cancel(msg->skb, hdr); |
| |
| return -EMSGSIZE; |
| } |
| |
| int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| int err; |
| int i = cb->args[0]; |
| struct tipc_bearer *bearer; |
| struct tipc_nl_msg msg; |
| struct net *net = sock_net(skb->sk); |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| |
| if (i == MAX_BEARERS) |
| return 0; |
| |
| msg.skb = skb; |
| msg.portid = NETLINK_CB(cb->skb).portid; |
| msg.seq = cb->nlh->nlmsg_seq; |
| |
| rtnl_lock(); |
| for (i = 0; i < MAX_BEARERS; i++) { |
| bearer = rtnl_dereference(tn->bearer_list[i]); |
| if (!bearer) |
| continue; |
| |
| err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI); |
| if (err) |
| break; |
| } |
| rtnl_unlock(); |
| |
| cb->args[0] = i; |
| return skb->len; |
| } |
| |
| int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| char *name; |
| struct sk_buff *rep; |
| struct tipc_bearer *bearer; |
| struct tipc_nl_msg msg; |
| struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| struct net *net = genl_info_net(info); |
| |
| if (!info->attrs[TIPC_NLA_BEARER]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| info->attrs[TIPC_NLA_BEARER], |
| tipc_nl_bearer_policy, info->extack); |
| if (err) |
| return err; |
| |
| if (!attrs[TIPC_NLA_BEARER_NAME]) |
| return -EINVAL; |
| name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| |
| rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!rep) |
| return -ENOMEM; |
| |
| msg.skb = rep; |
| msg.portid = info->snd_portid; |
| msg.seq = info->snd_seq; |
| |
| rtnl_lock(); |
| bearer = tipc_bearer_find(net, name); |
| if (!bearer) { |
| err = -EINVAL; |
| NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| goto err_out; |
| } |
| |
| err = __tipc_nl_add_bearer(&msg, bearer, 0); |
| if (err) |
| goto err_out; |
| rtnl_unlock(); |
| |
| return genlmsg_reply(rep, info); |
| err_out: |
| rtnl_unlock(); |
| nlmsg_free(rep); |
| |
| return err; |
| } |
| |
| int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| char *name; |
| struct tipc_bearer *bearer; |
| struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| struct net *net = sock_net(skb->sk); |
| |
| if (!info->attrs[TIPC_NLA_BEARER]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| info->attrs[TIPC_NLA_BEARER], |
| tipc_nl_bearer_policy, info->extack); |
| if (err) |
| return err; |
| |
| if (!attrs[TIPC_NLA_BEARER_NAME]) |
| return -EINVAL; |
| |
| name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| |
| bearer = tipc_bearer_find(net, name); |
| if (!bearer) { |
| NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| return -EINVAL; |
| } |
| |
| bearer_disable(net, bearer); |
| |
| return 0; |
| } |
| |
| int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| |
| rtnl_lock(); |
| err = __tipc_nl_bearer_disable(skb, info); |
| rtnl_unlock(); |
| |
| return err; |
| } |
| |
| int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| char *bearer; |
| struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| struct net *net = sock_net(skb->sk); |
| u32 domain = 0; |
| u32 prio; |
| |
| prio = TIPC_MEDIA_LINK_PRI; |
| |
| if (!info->attrs[TIPC_NLA_BEARER]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| info->attrs[TIPC_NLA_BEARER], |
| tipc_nl_bearer_policy, info->extack); |
| if (err) |
| return err; |
| |
| if (!attrs[TIPC_NLA_BEARER_NAME]) |
| return -EINVAL; |
| |
| bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| |
| if (attrs[TIPC_NLA_BEARER_DOMAIN]) |
| domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); |
| |
| if (attrs[TIPC_NLA_BEARER_PROP]) { |
| struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| |
| err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], |
| props); |
| if (err) |
| return err; |
| |
| if (props[TIPC_NLA_PROP_PRIO]) |
| prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| } |
| |
| return tipc_enable_bearer(net, bearer, domain, prio, attrs, |
| info->extack); |
| } |
| |
| int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| |
| rtnl_lock(); |
| err = __tipc_nl_bearer_enable(skb, info); |
| rtnl_unlock(); |
| |
| return err; |
| } |
| |
| int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| char *name; |
| struct tipc_bearer *b; |
| struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| struct net *net = sock_net(skb->sk); |
| |
| if (!info->attrs[TIPC_NLA_BEARER]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| info->attrs[TIPC_NLA_BEARER], |
| tipc_nl_bearer_policy, info->extack); |
| if (err) |
| return err; |
| |
| if (!attrs[TIPC_NLA_BEARER_NAME]) |
| return -EINVAL; |
| name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| |
| rtnl_lock(); |
| b = tipc_bearer_find(net, name); |
| if (!b) { |
| rtnl_unlock(); |
| NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| return -EINVAL; |
| } |
| |
| #ifdef CONFIG_TIPC_MEDIA_UDP |
| if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) { |
| err = tipc_udp_nl_bearer_add(b, |
| attrs[TIPC_NLA_BEARER_UDP_OPTS]); |
| if (err) { |
| rtnl_unlock(); |
| return err; |
| } |
| } |
| #endif |
| rtnl_unlock(); |
| |
| return 0; |
| } |
| |
| int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct tipc_bearer *b; |
| struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| struct net *net = sock_net(skb->sk); |
| char *name; |
| int err; |
| |
| if (!info->attrs[TIPC_NLA_BEARER]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX, |
| info->attrs[TIPC_NLA_BEARER], |
| tipc_nl_bearer_policy, info->extack); |
| if (err) |
| return err; |
| |
| if (!attrs[TIPC_NLA_BEARER_NAME]) |
| return -EINVAL; |
| name = nla_data(attrs[TIPC_NLA_BEARER_NAME]); |
| |
| b = tipc_bearer_find(net, name); |
| if (!b) { |
| NL_SET_ERR_MSG(info->extack, "Bearer not found"); |
| return -EINVAL; |
| } |
| |
| if (attrs[TIPC_NLA_BEARER_PROP]) { |
| struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| |
| err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP], |
| props); |
| if (err) |
| return err; |
| |
| if (props[TIPC_NLA_PROP_TOL]) { |
| b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL); |
| } |
| if (props[TIPC_NLA_PROP_PRIO]) |
| b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| if (props[TIPC_NLA_PROP_WIN]) |
| b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| if (props[TIPC_NLA_PROP_MTU]) { |
| if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) { |
| NL_SET_ERR_MSG(info->extack, |
| "MTU property is unsupported"); |
| return -EINVAL; |
| } |
| #ifdef CONFIG_TIPC_MEDIA_UDP |
| if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) < |
| b->encap_hlen + TIPC_MIN_BEARER_MTU) { |
| NL_SET_ERR_MSG(info->extack, |
| "MTU value is out-of-range"); |
| return -EINVAL; |
| } |
| b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); |
| tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU); |
| #endif |
| } |
| } |
| |
| return 0; |
| } |
| |
| int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| |
| rtnl_lock(); |
| err = __tipc_nl_bearer_set(skb, info); |
| rtnl_unlock(); |
| |
| return err; |
| } |
| |
| static int __tipc_nl_add_media(struct tipc_nl_msg *msg, |
| struct tipc_media *media, int nlflags) |
| { |
| void *hdr; |
| struct nlattr *attrs; |
| struct nlattr *prop; |
| |
| hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| nlflags, TIPC_NL_MEDIA_GET); |
| if (!hdr) |
| return -EMSGSIZE; |
| |
| attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA); |
| if (!attrs) |
| goto msg_full; |
| |
| if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name)) |
| goto attr_msg_full; |
| |
| prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP); |
| if (!prop) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance)) |
| goto prop_msg_full; |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win)) |
| goto prop_msg_full; |
| if (media->type_id == TIPC_MEDIA_TYPE_UDP) |
| if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu)) |
| goto prop_msg_full; |
| |
| nla_nest_end(msg->skb, prop); |
| nla_nest_end(msg->skb, attrs); |
| genlmsg_end(msg->skb, hdr); |
| |
| return 0; |
| |
| prop_msg_full: |
| nla_nest_cancel(msg->skb, prop); |
| attr_msg_full: |
| nla_nest_cancel(msg->skb, attrs); |
| msg_full: |
| genlmsg_cancel(msg->skb, hdr); |
| |
| return -EMSGSIZE; |
| } |
| |
| int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| int err; |
| int i = cb->args[0]; |
| struct tipc_nl_msg msg; |
| |
| if (i == MAX_MEDIA) |
| return 0; |
| |
| msg.skb = skb; |
| msg.portid = NETLINK_CB(cb->skb).portid; |
| msg.seq = cb->nlh->nlmsg_seq; |
| |
| rtnl_lock(); |
| for (; media_info_array[i] != NULL; i++) { |
| err = __tipc_nl_add_media(&msg, media_info_array[i], |
| NLM_F_MULTI); |
| if (err) |
| break; |
| } |
| rtnl_unlock(); |
| |
| cb->args[0] = i; |
| return skb->len; |
| } |
| |
| int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| char *name; |
| struct tipc_nl_msg msg; |
| struct tipc_media *media; |
| struct sk_buff *rep; |
| struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| |
| if (!info->attrs[TIPC_NLA_MEDIA]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, |
| info->attrs[TIPC_NLA_MEDIA], |
| tipc_nl_media_policy, info->extack); |
| if (err) |
| return err; |
| |
| if (!attrs[TIPC_NLA_MEDIA_NAME]) |
| return -EINVAL; |
| name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); |
| |
| rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!rep) |
| return -ENOMEM; |
| |
| msg.skb = rep; |
| msg.portid = info->snd_portid; |
| msg.seq = info->snd_seq; |
| |
| rtnl_lock(); |
| media = tipc_media_find(name); |
| if (!media) { |
| NL_SET_ERR_MSG(info->extack, "Media not found"); |
| err = -EINVAL; |
| goto err_out; |
| } |
| |
| err = __tipc_nl_add_media(&msg, media, 0); |
| if (err) |
| goto err_out; |
| rtnl_unlock(); |
| |
| return genlmsg_reply(rep, info); |
| err_out: |
| rtnl_unlock(); |
| nlmsg_free(rep); |
| |
| return err; |
| } |
| |
| int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| char *name; |
| struct tipc_media *m; |
| struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1]; |
| |
| if (!info->attrs[TIPC_NLA_MEDIA]) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX, |
| info->attrs[TIPC_NLA_MEDIA], |
| tipc_nl_media_policy, info->extack); |
| |
| if (!attrs[TIPC_NLA_MEDIA_NAME]) |
| return -EINVAL; |
| name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]); |
| |
| m = tipc_media_find(name); |
| if (!m) { |
| NL_SET_ERR_MSG(info->extack, "Media not found"); |
| return -EINVAL; |
| } |
| if (attrs[TIPC_NLA_MEDIA_PROP]) { |
| struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| |
| err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP], |
| props); |
| if (err) |
| return err; |
| |
| if (props[TIPC_NLA_PROP_TOL]) |
| m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| if (props[TIPC_NLA_PROP_PRIO]) |
| m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| if (props[TIPC_NLA_PROP_WIN]) |
| m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| if (props[TIPC_NLA_PROP_MTU]) { |
| if (m->type_id != TIPC_MEDIA_TYPE_UDP) { |
| NL_SET_ERR_MSG(info->extack, |
| "MTU property is unsupported"); |
| return -EINVAL; |
| } |
| #ifdef CONFIG_TIPC_MEDIA_UDP |
| if (tipc_udp_mtu_bad(nla_get_u32 |
| (props[TIPC_NLA_PROP_MTU]))) { |
| NL_SET_ERR_MSG(info->extack, |
| "MTU value is out-of-range"); |
| return -EINVAL; |
| } |
| m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]); |
| #endif |
| } |
| } |
| |
| return 0; |
| } |
| |
| int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| int err; |
| |
| rtnl_lock(); |
| err = __tipc_nl_media_set(skb, info); |
| rtnl_unlock(); |
| |
| return err; |
| } |