v4.19.13 snapshot.
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
new file mode 100644
index 0000000..9783101
--- /dev/null
+++ b/net/tipc/udp_media.c
@@ -0,0 +1,809 @@
+/* net/tipc/udp_media.c: IP bearer support for TIPC
+ *
+ * Copyright (c) 2015, 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:
+ *
+ * 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 <linux/socket.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/inet.h>
+#include <linux/inetdevice.h>
+#include <linux/igmp.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/list.h>
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/udp_tunnel.h>
+#include <net/addrconf.h>
+#include <linux/tipc_netlink.h>
+#include "core.h"
+#include "addr.h"
+#include "net.h"
+#include "bearer.h"
+#include "netlink.h"
+#include "msg.h"
+
+/* IANA assigned UDP port */
+#define UDP_PORT_DEFAULT 6118
+
+#define UDP_MIN_HEADROOM 48
+
+/**
+ * struct udp_media_addr - IP/UDP addressing information
+ *
+ * This is the bearer level originating address used in neighbor discovery
+ * messages, and all fields should be in network byte order
+ */
+struct udp_media_addr {
+ __be16 proto;
+ __be16 port;
+ union {
+ struct in_addr ipv4;
+ struct in6_addr ipv6;
+ };
+};
+
+/* struct udp_replicast - container for UDP remote addresses */
+struct udp_replicast {
+ struct udp_media_addr addr;
+ struct rcu_head rcu;
+ struct list_head list;
+};
+
+/**
+ * struct udp_bearer - ip/udp bearer data structure
+ * @bearer: associated generic tipc bearer
+ * @ubsock: bearer associated socket
+ * @ifindex: local address scope
+ * @work: used to schedule deferred work on a bearer
+ */
+struct udp_bearer {
+ struct tipc_bearer __rcu *bearer;
+ struct socket *ubsock;
+ u32 ifindex;
+ struct work_struct work;
+ struct udp_replicast rcast;
+};
+
+static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr)
+{
+ if (ntohs(addr->proto) == ETH_P_IP)
+ return ipv4_is_multicast(addr->ipv4.s_addr);
+#if IS_ENABLED(CONFIG_IPV6)
+ else
+ return ipv6_addr_is_multicast(&addr->ipv6);
+#endif
+ return 0;
+}
+
+/* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
+static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
+ struct udp_media_addr *ua)
+{
+ memset(addr, 0, sizeof(struct tipc_media_addr));
+ addr->media_id = TIPC_MEDIA_TYPE_UDP;
+ memcpy(addr->value, ua, sizeof(struct udp_media_addr));
+
+ if (tipc_udp_is_mcast_addr(ua))
+ addr->broadcast = TIPC_BROADCAST_SUPPORT;
+}
+
+/* tipc_udp_addr2str - convert ip/udp address to string */
+static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
+{
+ struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
+
+ if (ntohs(ua->proto) == ETH_P_IP)
+ snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
+ else if (ntohs(ua->proto) == ETH_P_IPV6)
+ snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
+ else
+ pr_err("Invalid UDP media address\n");
+ return 0;
+}
+
+/* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
+static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
+ char *msg)
+{
+ struct udp_media_addr *ua;
+
+ ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
+ if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
+ return -EINVAL;
+ tipc_udp_media_addr_set(a, ua);
+ return 0;
+}
+
+/* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
+static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
+{
+ memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
+ msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
+ memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
+ sizeof(struct udp_media_addr));
+ return 0;
+}
+
+/* tipc_send_msg - enqueue a send request */
+static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
+ struct udp_bearer *ub, struct udp_media_addr *src,
+ struct udp_media_addr *dst)
+{
+ int ttl, err = 0;
+ struct rtable *rt;
+
+ if (dst->proto == htons(ETH_P_IP)) {
+ struct flowi4 fl = {
+ .daddr = dst->ipv4.s_addr,
+ .saddr = src->ipv4.s_addr,
+ .flowi4_mark = skb->mark,
+ .flowi4_proto = IPPROTO_UDP
+ };
+ rt = ip_route_output_key(net, &fl);
+ if (IS_ERR(rt)) {
+ err = PTR_ERR(rt);
+ goto tx_error;
+ }
+
+ skb->dev = rt->dst.dev;
+ ttl = ip4_dst_hoplimit(&rt->dst);
+ udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
+ dst->ipv4.s_addr, 0, ttl, 0, src->port,
+ dst->port, false, true);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ struct dst_entry *ndst;
+ struct flowi6 fl6 = {
+ .flowi6_oif = ub->ifindex,
+ .daddr = dst->ipv6,
+ .saddr = src->ipv6,
+ .flowi6_proto = IPPROTO_UDP
+ };
+ err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
+ &fl6);
+ if (err)
+ goto tx_error;
+ ttl = ip6_dst_hoplimit(ndst);
+ err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb,
+ ndst->dev, &src->ipv6,
+ &dst->ipv6, 0, ttl, 0, src->port,
+ dst->port, false);
+#endif
+ }
+ return err;
+
+tx_error:
+ kfree_skb(skb);
+ return err;
+}
+
+static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
+ struct tipc_bearer *b,
+ struct tipc_media_addr *addr)
+{
+ struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
+ struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
+ struct udp_replicast *rcast;
+ struct udp_bearer *ub;
+ int err = 0;
+
+ if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
+ err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
+ if (err)
+ goto out;
+ }
+
+ skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
+ ub = rcu_dereference_rtnl(b->media_ptr);
+ if (!ub) {
+ err = -ENODEV;
+ goto out;
+ }
+
+ if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
+ return tipc_udp_xmit(net, skb, ub, src, dst);
+
+ /* Replicast, send an skb to each configured IP address */
+ list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
+ struct sk_buff *_skb;
+
+ _skb = pskb_copy(skb, GFP_ATOMIC);
+ if (!_skb) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr);
+ if (err) {
+ kfree_skb(_skb);
+ goto out;
+ }
+ }
+ err = 0;
+out:
+ kfree_skb(skb);
+ return err;
+}
+
+static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
+ struct udp_media_addr *addr)
+{
+ struct udp_replicast *rcast, *tmp;
+ struct udp_bearer *ub;
+
+ ub = rcu_dereference_rtnl(b->media_ptr);
+ if (!ub) {
+ pr_err_ratelimited("UDP bearer instance not found\n");
+ return false;
+ }
+
+ list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
+ if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
+ return true;
+ }
+
+ return false;
+}
+
+static int tipc_udp_rcast_add(struct tipc_bearer *b,
+ struct udp_media_addr *addr)
+{
+ struct udp_replicast *rcast;
+ struct udp_bearer *ub;
+
+ ub = rcu_dereference_rtnl(b->media_ptr);
+ if (!ub)
+ return -ENODEV;
+
+ rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
+ if (!rcast)
+ return -ENOMEM;
+
+ memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
+
+ if (ntohs(addr->proto) == ETH_P_IP)
+ pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (ntohs(addr->proto) == ETH_P_IPV6)
+ pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
+#endif
+ b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT;
+ list_add_rcu(&rcast->list, &ub->rcast.list);
+ return 0;
+}
+
+static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
+{
+ struct udp_media_addr src = {0};
+ struct udp_media_addr *dst;
+
+ dst = (struct udp_media_addr *)&b->bcast_addr.value;
+ if (tipc_udp_is_mcast_addr(dst))
+ return 0;
+
+ src.port = udp_hdr(skb)->source;
+
+ if (ip_hdr(skb)->version == 4) {
+ struct iphdr *iphdr = ip_hdr(skb);
+
+ src.proto = htons(ETH_P_IP);
+ src.ipv4.s_addr = iphdr->saddr;
+ if (ipv4_is_multicast(iphdr->daddr))
+ return 0;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (ip_hdr(skb)->version == 6) {
+ struct ipv6hdr *iphdr = ipv6_hdr(skb);
+
+ src.proto = htons(ETH_P_IPV6);
+ src.ipv6 = iphdr->saddr;
+ if (ipv6_addr_is_multicast(&iphdr->daddr))
+ return 0;
+#endif
+ } else {
+ return 0;
+ }
+
+ if (likely(tipc_udp_is_known_peer(b, &src)))
+ return 0;
+
+ return tipc_udp_rcast_add(b, &src);
+}
+
+/* tipc_udp_recv - read data from bearer socket */
+static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct udp_bearer *ub;
+ struct tipc_bearer *b;
+ struct tipc_msg *hdr;
+ int err;
+
+ ub = rcu_dereference_sk_user_data(sk);
+ if (!ub) {
+ pr_err_ratelimited("Failed to get UDP bearer reference");
+ goto out;
+ }
+ skb_pull(skb, sizeof(struct udphdr));
+ hdr = buf_msg(skb);
+
+ rcu_read_lock();
+ b = rcu_dereference_rtnl(ub->bearer);
+ if (!b)
+ goto rcu_out;
+
+ if (b && test_bit(0, &b->up)) {
+ tipc_rcv(sock_net(sk), skb, b);
+ rcu_read_unlock();
+ return 0;
+ }
+
+ if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
+ err = tipc_udp_rcast_disc(b, skb);
+ if (err)
+ goto rcu_out;
+ }
+
+rcu_out:
+ rcu_read_unlock();
+out:
+ kfree_skb(skb);
+ return 0;
+}
+
+static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
+{
+ int err = 0;
+ struct ip_mreqn mreqn;
+ struct sock *sk = ub->ubsock->sk;
+
+ if (ntohs(remote->proto) == ETH_P_IP) {
+ mreqn.imr_multiaddr = remote->ipv4;
+ mreqn.imr_ifindex = ub->ifindex;
+ err = ip_mc_join_group(sk, &mreqn);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
+ &remote->ipv6);
+#endif
+ }
+ return err;
+}
+
+static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
+ struct udp_media_addr *addr, int nla_t)
+{
+ if (ntohs(addr->proto) == ETH_P_IP) {
+ struct sockaddr_in ip4;
+
+ memset(&ip4, 0, sizeof(ip4));
+ ip4.sin_family = AF_INET;
+ ip4.sin_port = addr->port;
+ ip4.sin_addr.s_addr = addr->ipv4.s_addr;
+ if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
+ return -EMSGSIZE;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (ntohs(addr->proto) == ETH_P_IPV6) {
+ struct sockaddr_in6 ip6;
+
+ memset(&ip6, 0, sizeof(ip6));
+ ip6.sin6_family = AF_INET6;
+ ip6.sin6_port = addr->port;
+ memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
+ if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
+ return -EMSGSIZE;
+#endif
+ }
+
+ return 0;
+}
+
+int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ u32 bid = cb->args[0];
+ u32 skip_cnt = cb->args[1];
+ u32 portid = NETLINK_CB(cb->skb).portid;
+ struct udp_replicast *rcast, *tmp;
+ struct tipc_bearer *b;
+ struct udp_bearer *ub;
+ void *hdr;
+ int err;
+ int i;
+
+ if (!bid && !skip_cnt) {
+ struct net *net = sock_net(skb->sk);
+ struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
+ struct nlattr **attrs;
+ char *bname;
+
+ err = tipc_nlmsg_parse(cb->nlh, &attrs);
+ if (err)
+ return err;
+
+ if (!attrs[TIPC_NLA_BEARER])
+ return -EINVAL;
+
+ err = nla_parse_nested(battrs, TIPC_NLA_BEARER_MAX,
+ attrs[TIPC_NLA_BEARER],
+ tipc_nl_bearer_policy, NULL);
+ if (err)
+ return err;
+
+ if (!battrs[TIPC_NLA_BEARER_NAME])
+ return -EINVAL;
+
+ bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
+
+ rtnl_lock();
+ b = tipc_bearer_find(net, bname);
+ if (!b) {
+ rtnl_unlock();
+ return -EINVAL;
+ }
+ bid = b->identity;
+ } else {
+ struct net *net = sock_net(skb->sk);
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+ rtnl_lock();
+ b = rtnl_dereference(tn->bearer_list[bid]);
+ if (!b) {
+ rtnl_unlock();
+ return -EINVAL;
+ }
+ }
+
+ ub = rcu_dereference_rtnl(b->media_ptr);
+ if (!ub) {
+ rtnl_unlock();
+ return -EINVAL;
+ }
+
+ i = 0;
+ list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
+ if (i < skip_cnt)
+ goto count;
+
+ hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
+ &tipc_genl_family, NLM_F_MULTI,
+ TIPC_NL_BEARER_GET);
+ if (!hdr)
+ goto done;
+
+ err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
+ TIPC_NLA_UDP_REMOTE);
+ if (err) {
+ genlmsg_cancel(skb, hdr);
+ goto done;
+ }
+ genlmsg_end(skb, hdr);
+count:
+ i++;
+ }
+done:
+ rtnl_unlock();
+ cb->args[0] = bid;
+ cb->args[1] = i;
+
+ return skb->len;
+}
+
+int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
+{
+ struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
+ struct udp_media_addr *dst;
+ struct udp_bearer *ub;
+ struct nlattr *nest;
+
+ ub = rcu_dereference_rtnl(b->media_ptr);
+ if (!ub)
+ return -ENODEV;
+
+ nest = nla_nest_start(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
+ if (!nest)
+ goto msg_full;
+
+ if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
+ goto msg_full;
+
+ dst = (struct udp_media_addr *)&b->bcast_addr.value;
+ if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
+ goto msg_full;
+
+ if (!list_empty(&ub->rcast.list)) {
+ if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
+ goto msg_full;
+ }
+
+ nla_nest_end(msg->skb, nest);
+ return 0;
+msg_full:
+ nla_nest_cancel(msg->skb, nest);
+ return -EMSGSIZE;
+}
+
+/**
+ * tipc_parse_udp_addr - build udp media address from netlink data
+ * @nlattr: netlink attribute containing sockaddr storage aligned address
+ * @addr: tipc media address to fill with address, port and protocol type
+ * @scope_id: IPv6 scope id pointer, not NULL indicates it's required
+ */
+
+static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
+ u32 *scope_id)
+{
+ struct sockaddr_storage sa;
+
+ nla_memcpy(&sa, nla, sizeof(sa));
+ if (sa.ss_family == AF_INET) {
+ struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
+
+ addr->proto = htons(ETH_P_IP);
+ addr->port = ip4->sin_port;
+ addr->ipv4.s_addr = ip4->sin_addr.s_addr;
+ return 0;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (sa.ss_family == AF_INET6) {
+ struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
+
+ addr->proto = htons(ETH_P_IPV6);
+ addr->port = ip6->sin6_port;
+ memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
+
+ /* Scope ID is only interesting for local addresses */
+ if (scope_id) {
+ int atype;
+
+ atype = ipv6_addr_type(&ip6->sin6_addr);
+ if (__ipv6_addr_needs_scope_id(atype) &&
+ !ip6->sin6_scope_id) {
+ return -EINVAL;
+ }
+
+ *scope_id = ip6->sin6_scope_id ? : 0;
+ }
+
+ return 0;
+#endif
+ }
+ return -EADDRNOTAVAIL;
+}
+
+int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
+{
+ int err;
+ struct udp_media_addr addr = {0};
+ struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
+ struct udp_media_addr *dst;
+
+ if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr,
+ tipc_nl_udp_policy, NULL))
+ return -EINVAL;
+
+ if (!opts[TIPC_NLA_UDP_REMOTE])
+ return -EINVAL;
+
+ err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
+ if (err)
+ return err;
+
+ dst = (struct udp_media_addr *)&b->bcast_addr.value;
+ if (tipc_udp_is_mcast_addr(dst)) {
+ pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
+ return -EINVAL;
+ }
+
+ if (tipc_udp_is_known_peer(b, &addr))
+ return 0;
+
+ return tipc_udp_rcast_add(b, &addr);
+}
+
+/**
+ * tipc_udp_enable - callback to create a new udp bearer instance
+ * @net: network namespace
+ * @b: pointer to generic tipc_bearer
+ * @attrs: netlink bearer configuration
+ *
+ * validate the bearer parameters and initialize the udp bearer
+ * rtnl_lock should be held
+ */
+static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
+ struct nlattr *attrs[])
+{
+ int err = -EINVAL;
+ struct udp_bearer *ub;
+ struct udp_media_addr remote = {0};
+ struct udp_media_addr local = {0};
+ struct udp_port_cfg udp_conf = {0};
+ struct udp_tunnel_sock_cfg tuncfg = {NULL};
+ struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
+ u8 node_id[NODE_ID_LEN] = {0,};
+
+ ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
+ if (!ub)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&ub->rcast.list);
+
+ if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
+ goto err;
+
+ if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
+ attrs[TIPC_NLA_BEARER_UDP_OPTS],
+ tipc_nl_udp_policy, NULL))
+ goto err;
+
+ if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
+ pr_err("Invalid UDP bearer configuration");
+ err = -EINVAL;
+ goto err;
+ }
+
+ err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
+ &ub->ifindex);
+ if (err)
+ goto err;
+
+ err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
+ if (err)
+ goto err;
+
+ /* Autoconfigure own node identity if needed */
+ if (!tipc_own_id(net)) {
+ memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
+ tipc_net_init(net, node_id, 0);
+ }
+ if (!tipc_own_id(net)) {
+ pr_warn("Failed to set node id, please configure manually\n");
+ err = -EINVAL;
+ goto err;
+ }
+
+ b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
+ b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
+ rcu_assign_pointer(b->media_ptr, ub);
+ rcu_assign_pointer(ub->bearer, b);
+ tipc_udp_media_addr_set(&b->addr, &local);
+ if (local.proto == htons(ETH_P_IP)) {
+ struct net_device *dev;
+
+ dev = __ip_dev_find(net, local.ipv4.s_addr, false);
+ if (!dev) {
+ err = -ENODEV;
+ goto err;
+ }
+ udp_conf.family = AF_INET;
+ udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+ udp_conf.use_udp_checksums = false;
+ ub->ifindex = dev->ifindex;
+ if (tipc_mtu_bad(dev, sizeof(struct iphdr) +
+ sizeof(struct udphdr))) {
+ err = -EINVAL;
+ goto err;
+ }
+ b->mtu = b->media->mtu;
+#if IS_ENABLED(CONFIG_IPV6)
+ } else if (local.proto == htons(ETH_P_IPV6)) {
+ udp_conf.family = AF_INET6;
+ udp_conf.use_udp6_tx_checksums = true;
+ udp_conf.use_udp6_rx_checksums = true;
+ udp_conf.local_ip6 = in6addr_any;
+ b->mtu = 1280;
+#endif
+ } else {
+ err = -EAFNOSUPPORT;
+ goto err;
+ }
+ udp_conf.local_udp_port = local.port;
+ err = udp_sock_create(net, &udp_conf, &ub->ubsock);
+ if (err)
+ goto err;
+ tuncfg.sk_user_data = ub;
+ tuncfg.encap_type = 1;
+ tuncfg.encap_rcv = tipc_udp_recv;
+ tuncfg.encap_destroy = NULL;
+ setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
+
+ /**
+ * The bcast media address port is used for all peers and the ip
+ * is used if it's a multicast address.
+ */
+ memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
+ if (tipc_udp_is_mcast_addr(&remote))
+ err = enable_mcast(ub, &remote);
+ else
+ err = tipc_udp_rcast_add(b, &remote);
+ if (err)
+ goto err;
+
+ return 0;
+err:
+ if (ub->ubsock)
+ udp_tunnel_sock_release(ub->ubsock);
+ kfree(ub);
+ return err;
+}
+
+/* cleanup_bearer - break the socket/bearer association */
+static void cleanup_bearer(struct work_struct *work)
+{
+ struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
+ struct udp_replicast *rcast, *tmp;
+
+ list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
+ list_del_rcu(&rcast->list);
+ kfree_rcu(rcast, rcu);
+ }
+
+ if (ub->ubsock)
+ udp_tunnel_sock_release(ub->ubsock);
+ synchronize_net();
+ kfree(ub);
+}
+
+/* tipc_udp_disable - detach bearer from socket */
+static void tipc_udp_disable(struct tipc_bearer *b)
+{
+ struct udp_bearer *ub;
+
+ ub = rcu_dereference_rtnl(b->media_ptr);
+ if (!ub) {
+ pr_err("UDP bearer instance not found\n");
+ return;
+ }
+ if (ub->ubsock)
+ sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
+ RCU_INIT_POINTER(ub->bearer, NULL);
+
+ /* sock_release need to be done outside of rtnl lock */
+ INIT_WORK(&ub->work, cleanup_bearer);
+ schedule_work(&ub->work);
+}
+
+struct tipc_media udp_media_info = {
+ .send_msg = tipc_udp_send_msg,
+ .enable_media = tipc_udp_enable,
+ .disable_media = tipc_udp_disable,
+ .addr2str = tipc_udp_addr2str,
+ .addr2msg = tipc_udp_addr2msg,
+ .msg2addr = tipc_udp_msg2addr,
+ .priority = TIPC_DEF_LINK_PRI,
+ .tolerance = TIPC_DEF_LINK_TOL,
+ .window = TIPC_DEF_LINK_WIN,
+ .mtu = TIPC_DEF_LINK_UDP_MTU,
+ .type_id = TIPC_MEDIA_TYPE_UDP,
+ .hwaddr_len = 0,
+ .name = "udp"
+};