| /* 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/ipv6_stubs.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 dst_cache dst_cache; |
| 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, struct dst_cache *cache) |
| { |
| struct dst_entry *ndst; |
| int ttl, err = 0; |
| |
| local_bh_disable(); |
| ndst = dst_cache_get(cache); |
| if (dst->proto == htons(ETH_P_IP)) { |
| struct rtable *rt = (struct rtable *)ndst; |
| |
| if (!rt) { |
| 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; |
| } |
| dst_cache_set_ip4(cache, &rt->dst, fl.saddr); |
| } |
| |
| 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 { |
| if (!ndst) { |
| struct flowi6 fl6 = { |
| .flowi6_oif = ub->ifindex, |
| .daddr = dst->ipv6, |
| .saddr = src->ipv6, |
| .flowi6_proto = IPPROTO_UDP |
| }; |
| ndst = ipv6_stub->ipv6_dst_lookup_flow(net, |
| ub->ubsock->sk, |
| &fl6, NULL); |
| if (IS_ERR(ndst)) { |
| err = PTR_ERR(ndst); |
| goto tx_error; |
| } |
| dst_cache_set_ip6(cache, ndst, &fl6.saddr); |
| } |
| ttl = ip6_dst_hoplimit(ndst); |
| err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL, |
| &src->ipv6, &dst->ipv6, 0, ttl, 0, |
| src->port, dst->port, false); |
| #endif |
| } |
| local_bh_enable(); |
| return err; |
| |
| tx_error: |
| local_bh_enable(); |
| 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(b->media_ptr); |
| if (!ub) { |
| err = -ENODEV; |
| goto out; |
| } |
| |
| if (addr->broadcast != TIPC_REPLICAST_SUPPORT) |
| return tipc_udp_xmit(net, skb, ub, src, dst, |
| &ub->rcast.dst_cache); |
| |
| /* 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, |
| &rcast->dst_cache); |
| if (err) |
| 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; |
| |
| if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) { |
| kfree(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); |
| |
| b = rcu_dereference(ub->bearer); |
| if (!b) |
| goto out; |
| |
| if (b && test_bit(0, &b->up)) { |
| tipc_rcv(sock_net(sk), skb, b); |
| return 0; |
| } |
| |
| if (unlikely(msg_user(hdr) == LINK_CONFIG)) { |
| err = tipc_udp_rcast_disc(b, skb); |
| if (err) |
| goto out; |
| } |
| |
| 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_deprecated(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 = rtnl_dereference(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 = rtnl_dereference(b->media_ptr); |
| if (!ub) |
| return -ENODEV; |
| |
| nest = nla_nest_start_noflag(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_deprecated(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,}; |
| int rmcast = 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_deprecated(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; |
| |
| if (remote.proto != local.proto) { |
| err = -EINVAL; |
| goto err; |
| } |
| |
| /* Checking remote ip address */ |
| rmcast = tipc_udp_is_mcast_addr(&remote); |
| |
| /* 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; |
| |
| /* Switch to use ANY to receive packets from group */ |
| if (rmcast) |
| udp_conf.local_ip.s_addr = htonl(INADDR_ANY); |
| else |
| udp_conf.local_ip.s_addr = local.ipv4.s_addr; |
| 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; |
| if (rmcast) |
| udp_conf.local_ip6 = in6addr_any; |
| else |
| udp_conf.local_ip6 = local.ipv6; |
| 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); |
| |
| err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC); |
| if (err) |
| goto free; |
| |
| /** |
| * 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 (rmcast) |
| err = enable_mcast(ub, &remote); |
| else |
| err = tipc_udp_rcast_add(b, &remote); |
| if (err) |
| goto free; |
| |
| return 0; |
| |
| free: |
| dst_cache_destroy(&ub->rcast.dst_cache); |
| udp_tunnel_sock_release(ub->ubsock); |
| err: |
| 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) { |
| dst_cache_destroy(&rcast->dst_cache); |
| list_del_rcu(&rcast->list); |
| kfree_rcu(rcast, rcu); |
| } |
| |
| dst_cache_destroy(&ub->rcast.dst_cache); |
| 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 = rtnl_dereference(b->media_ptr); |
| if (!ub) { |
| pr_err("UDP bearer instance not found\n"); |
| return; |
| } |
| 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" |
| }; |