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858 lines
22 KiB
858 lines
22 KiB
/* net/tipc/udp_media.c: IP bearer support for TIPC |
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* |
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* Copyright (c) 2015, Ericsson AB |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the names of the copyright holders nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* Alternatively, this software may be distributed under the terms of the |
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* GNU General Public License ("GPL") version 2 as published by the Free |
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* Software Foundation. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include <linux/socket.h> |
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#include <linux/ip.h> |
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#include <linux/udp.h> |
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#include <linux/inet.h> |
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#include <linux/inetdevice.h> |
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#include <linux/igmp.h> |
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#include <linux/kernel.h> |
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#include <linux/workqueue.h> |
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#include <linux/list.h> |
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#include <net/sock.h> |
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#include <net/ip.h> |
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#include <net/udp_tunnel.h> |
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#include <net/ipv6_stubs.h> |
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#include <linux/tipc_netlink.h> |
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#include "core.h" |
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#include "addr.h" |
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#include "net.h" |
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#include "bearer.h" |
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#include "netlink.h" |
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#include "msg.h" |
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#include "udp_media.h" |
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|
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/* IANA assigned UDP port */ |
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#define UDP_PORT_DEFAULT 6118 |
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|
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#define UDP_MIN_HEADROOM 48 |
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|
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/** |
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* struct udp_media_addr - IP/UDP addressing information |
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* |
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* This is the bearer level originating address used in neighbor discovery |
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* messages, and all fields should be in network byte order |
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* |
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* @proto: Ethernet protocol in use |
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* @port: port being used |
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* @ipv4: IPv4 address of neighbor |
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* @ipv6: IPv6 address of neighbor |
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*/ |
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struct udp_media_addr { |
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__be16 proto; |
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__be16 port; |
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union { |
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struct in_addr ipv4; |
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struct in6_addr ipv6; |
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}; |
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}; |
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/* struct udp_replicast - container for UDP remote addresses */ |
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struct udp_replicast { |
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struct udp_media_addr addr; |
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struct dst_cache dst_cache; |
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struct rcu_head rcu; |
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struct list_head list; |
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}; |
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/** |
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* struct udp_bearer - ip/udp bearer data structure |
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* @bearer: associated generic tipc bearer |
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* @ubsock: bearer associated socket |
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* @ifindex: local address scope |
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* @work: used to schedule deferred work on a bearer |
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* @rcast: associated udp_replicast container |
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*/ |
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struct udp_bearer { |
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struct tipc_bearer __rcu *bearer; |
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struct socket *ubsock; |
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u32 ifindex; |
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struct work_struct work; |
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struct udp_replicast rcast; |
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}; |
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static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr) |
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{ |
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if (ntohs(addr->proto) == ETH_P_IP) |
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return ipv4_is_multicast(addr->ipv4.s_addr); |
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#if IS_ENABLED(CONFIG_IPV6) |
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else |
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return ipv6_addr_is_multicast(&addr->ipv6); |
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#endif |
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return 0; |
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} |
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/* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ |
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static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, |
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struct udp_media_addr *ua) |
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{ |
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memset(addr, 0, sizeof(struct tipc_media_addr)); |
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addr->media_id = TIPC_MEDIA_TYPE_UDP; |
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memcpy(addr->value, ua, sizeof(struct udp_media_addr)); |
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if (tipc_udp_is_mcast_addr(ua)) |
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addr->broadcast = TIPC_BROADCAST_SUPPORT; |
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} |
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|
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/* tipc_udp_addr2str - convert ip/udp address to string */ |
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static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) |
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{ |
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struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; |
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if (ntohs(ua->proto) == ETH_P_IP) |
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snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port)); |
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else if (ntohs(ua->proto) == ETH_P_IPV6) |
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snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port)); |
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else |
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pr_err("Invalid UDP media address\n"); |
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return 0; |
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} |
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/* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ |
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static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, |
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char *msg) |
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{ |
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struct udp_media_addr *ua; |
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ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); |
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if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) |
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return -EINVAL; |
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tipc_udp_media_addr_set(a, ua); |
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return 0; |
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} |
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/* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ |
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static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) |
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{ |
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memset(msg, 0, TIPC_MEDIA_INFO_SIZE); |
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msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; |
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memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, |
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sizeof(struct udp_media_addr)); |
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return 0; |
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} |
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/* tipc_send_msg - enqueue a send request */ |
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static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, |
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struct udp_bearer *ub, struct udp_media_addr *src, |
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struct udp_media_addr *dst, struct dst_cache *cache) |
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{ |
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struct dst_entry *ndst; |
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int ttl, err = 0; |
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local_bh_disable(); |
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ndst = dst_cache_get(cache); |
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if (dst->proto == htons(ETH_P_IP)) { |
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struct rtable *rt = (struct rtable *)ndst; |
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if (!rt) { |
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struct flowi4 fl = { |
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.daddr = dst->ipv4.s_addr, |
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.saddr = src->ipv4.s_addr, |
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.flowi4_mark = skb->mark, |
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.flowi4_proto = IPPROTO_UDP |
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}; |
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rt = ip_route_output_key(net, &fl); |
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if (IS_ERR(rt)) { |
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err = PTR_ERR(rt); |
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goto tx_error; |
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} |
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dst_cache_set_ip4(cache, &rt->dst, fl.saddr); |
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} |
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ttl = ip4_dst_hoplimit(&rt->dst); |
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udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, |
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dst->ipv4.s_addr, 0, ttl, 0, src->port, |
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dst->port, false, true); |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else { |
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if (!ndst) { |
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struct flowi6 fl6 = { |
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.flowi6_oif = ub->ifindex, |
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.daddr = dst->ipv6, |
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.saddr = src->ipv6, |
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.flowi6_proto = IPPROTO_UDP |
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}; |
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ndst = ipv6_stub->ipv6_dst_lookup_flow(net, |
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ub->ubsock->sk, |
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&fl6, NULL); |
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if (IS_ERR(ndst)) { |
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err = PTR_ERR(ndst); |
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goto tx_error; |
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} |
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dst_cache_set_ip6(cache, ndst, &fl6.saddr); |
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} |
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ttl = ip6_dst_hoplimit(ndst); |
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err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL, |
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&src->ipv6, &dst->ipv6, 0, ttl, 0, |
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src->port, dst->port, false); |
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#endif |
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} |
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local_bh_enable(); |
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return err; |
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tx_error: |
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local_bh_enable(); |
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kfree_skb(skb); |
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return err; |
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} |
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static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, |
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struct tipc_bearer *b, |
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struct tipc_media_addr *addr) |
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{ |
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struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; |
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struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value; |
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struct udp_replicast *rcast; |
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struct udp_bearer *ub; |
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int err = 0; |
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if (skb_headroom(skb) < UDP_MIN_HEADROOM) { |
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err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); |
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if (err) |
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goto out; |
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} |
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skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); |
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ub = rcu_dereference(b->media_ptr); |
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if (!ub) { |
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err = -ENODEV; |
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goto out; |
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} |
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if (addr->broadcast != TIPC_REPLICAST_SUPPORT) |
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return tipc_udp_xmit(net, skb, ub, src, dst, |
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&ub->rcast.dst_cache); |
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|
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/* Replicast, send an skb to each configured IP address */ |
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list_for_each_entry_rcu(rcast, &ub->rcast.list, list) { |
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struct sk_buff *_skb; |
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_skb = pskb_copy(skb, GFP_ATOMIC); |
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if (!_skb) { |
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err = -ENOMEM; |
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goto out; |
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} |
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err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr, |
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&rcast->dst_cache); |
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if (err) |
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goto out; |
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} |
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err = 0; |
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out: |
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kfree_skb(skb); |
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return err; |
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} |
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static bool tipc_udp_is_known_peer(struct tipc_bearer *b, |
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struct udp_media_addr *addr) |
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{ |
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struct udp_replicast *rcast, *tmp; |
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struct udp_bearer *ub; |
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ub = rcu_dereference_rtnl(b->media_ptr); |
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if (!ub) { |
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pr_err_ratelimited("UDP bearer instance not found\n"); |
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return false; |
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} |
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list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { |
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if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) |
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return true; |
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} |
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return false; |
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} |
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static int tipc_udp_rcast_add(struct tipc_bearer *b, |
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struct udp_media_addr *addr) |
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{ |
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struct udp_replicast *rcast; |
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struct udp_bearer *ub; |
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ub = rcu_dereference_rtnl(b->media_ptr); |
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if (!ub) |
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return -ENODEV; |
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rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC); |
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if (!rcast) |
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return -ENOMEM; |
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if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) { |
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kfree(rcast); |
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return -ENOMEM; |
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} |
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memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); |
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if (ntohs(addr->proto) == ETH_P_IP) |
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pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); |
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#if IS_ENABLED(CONFIG_IPV6) |
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else if (ntohs(addr->proto) == ETH_P_IPV6) |
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pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); |
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#endif |
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b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; |
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list_add_rcu(&rcast->list, &ub->rcast.list); |
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return 0; |
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} |
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static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) |
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{ |
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struct udp_media_addr src = {0}; |
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struct udp_media_addr *dst; |
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dst = (struct udp_media_addr *)&b->bcast_addr.value; |
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if (tipc_udp_is_mcast_addr(dst)) |
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return 0; |
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src.port = udp_hdr(skb)->source; |
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if (ip_hdr(skb)->version == 4) { |
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struct iphdr *iphdr = ip_hdr(skb); |
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src.proto = htons(ETH_P_IP); |
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src.ipv4.s_addr = iphdr->saddr; |
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if (ipv4_is_multicast(iphdr->daddr)) |
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return 0; |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else if (ip_hdr(skb)->version == 6) { |
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struct ipv6hdr *iphdr = ipv6_hdr(skb); |
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|
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src.proto = htons(ETH_P_IPV6); |
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src.ipv6 = iphdr->saddr; |
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if (ipv6_addr_is_multicast(&iphdr->daddr)) |
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return 0; |
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#endif |
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} else { |
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return 0; |
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} |
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|
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if (likely(tipc_udp_is_known_peer(b, &src))) |
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return 0; |
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return tipc_udp_rcast_add(b, &src); |
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} |
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|
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/* tipc_udp_recv - read data from bearer socket */ |
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static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) |
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{ |
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struct udp_bearer *ub; |
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struct tipc_bearer *b; |
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struct tipc_msg *hdr; |
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int err; |
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ub = rcu_dereference_sk_user_data(sk); |
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if (!ub) { |
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pr_err_ratelimited("Failed to get UDP bearer reference"); |
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goto out; |
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} |
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skb_pull(skb, sizeof(struct udphdr)); |
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hdr = buf_msg(skb); |
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b = rcu_dereference(ub->bearer); |
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if (!b) |
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goto out; |
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|
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if (b && test_bit(0, &b->up)) { |
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TIPC_SKB_CB(skb)->flags = 0; |
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tipc_rcv(sock_net(sk), skb, b); |
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return 0; |
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} |
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if (unlikely(msg_user(hdr) == LINK_CONFIG)) { |
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err = tipc_udp_rcast_disc(b, skb); |
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if (err) |
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goto out; |
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} |
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out: |
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kfree_skb(skb); |
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return 0; |
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} |
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static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) |
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{ |
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int err = 0; |
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struct ip_mreqn mreqn; |
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struct sock *sk = ub->ubsock->sk; |
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|
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if (ntohs(remote->proto) == ETH_P_IP) { |
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mreqn.imr_multiaddr = remote->ipv4; |
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mreqn.imr_ifindex = ub->ifindex; |
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err = ip_mc_join_group(sk, &mreqn); |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else { |
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lock_sock(sk); |
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err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, |
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&remote->ipv6); |
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release_sock(sk); |
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#endif |
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} |
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return err; |
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} |
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|
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static int __tipc_nl_add_udp_addr(struct sk_buff *skb, |
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struct udp_media_addr *addr, int nla_t) |
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{ |
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if (ntohs(addr->proto) == ETH_P_IP) { |
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struct sockaddr_in ip4; |
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|
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memset(&ip4, 0, sizeof(ip4)); |
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ip4.sin_family = AF_INET; |
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ip4.sin_port = addr->port; |
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ip4.sin_addr.s_addr = addr->ipv4.s_addr; |
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if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) |
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return -EMSGSIZE; |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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} else if (ntohs(addr->proto) == ETH_P_IPV6) { |
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struct sockaddr_in6 ip6; |
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|
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memset(&ip6, 0, sizeof(ip6)); |
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ip6.sin6_family = AF_INET6; |
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ip6.sin6_port = addr->port; |
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memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); |
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if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) |
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return -EMSGSIZE; |
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#endif |
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} |
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|
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return 0; |
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} |
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|
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int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) |
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{ |
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u32 bid = cb->args[0]; |
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u32 skip_cnt = cb->args[1]; |
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u32 portid = NETLINK_CB(cb->skb).portid; |
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struct udp_replicast *rcast, *tmp; |
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struct tipc_bearer *b; |
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struct udp_bearer *ub; |
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void *hdr; |
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int err; |
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int i; |
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|
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if (!bid && !skip_cnt) { |
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struct nlattr **attrs = genl_dumpit_info(cb)->attrs; |
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struct net *net = sock_net(skb->sk); |
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struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; |
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char *bname; |
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|
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if (!attrs[TIPC_NLA_BEARER]) |
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return -EINVAL; |
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|
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err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX, |
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attrs[TIPC_NLA_BEARER], |
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tipc_nl_bearer_policy, NULL); |
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if (err) |
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return err; |
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|
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if (!battrs[TIPC_NLA_BEARER_NAME]) |
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return -EINVAL; |
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|
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bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); |
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|
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rtnl_lock(); |
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b = tipc_bearer_find(net, bname); |
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if (!b) { |
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rtnl_unlock(); |
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return -EINVAL; |
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} |
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bid = b->identity; |
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} else { |
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struct net *net = sock_net(skb->sk); |
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struct tipc_net *tn = net_generic(net, tipc_net_id); |
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|
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rtnl_lock(); |
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b = rtnl_dereference(tn->bearer_list[bid]); |
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if (!b) { |
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rtnl_unlock(); |
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return -EINVAL; |
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} |
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} |
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|
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ub = rtnl_dereference(b->media_ptr); |
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if (!ub) { |
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rtnl_unlock(); |
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return -EINVAL; |
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} |
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|
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i = 0; |
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list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { |
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if (i < skip_cnt) |
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goto count; |
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|
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hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, |
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&tipc_genl_family, NLM_F_MULTI, |
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TIPC_NL_BEARER_GET); |
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if (!hdr) |
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goto done; |
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|
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err = __tipc_nl_add_udp_addr(skb, &rcast->addr, |
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TIPC_NLA_UDP_REMOTE); |
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if (err) { |
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genlmsg_cancel(skb, hdr); |
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goto done; |
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} |
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genlmsg_end(skb, hdr); |
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count: |
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i++; |
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} |
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done: |
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rtnl_unlock(); |
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cb->args[0] = bid; |
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cb->args[1] = i; |
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|
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return skb->len; |
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} |
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|
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int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) |
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{ |
|
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 |
|
* @nla: 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,}; |
|
struct net_device *dev; |
|
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)) { |
|
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)) { |
|
dev = ub->ifindex ? __dev_get_by_index(net, ub->ifindex) : NULL; |
|
dev = ipv6_dev_find(net, &local.ipv6, dev); |
|
if (!dev) { |
|
err = -ENODEV; |
|
goto err; |
|
} |
|
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; |
|
ub->ifindex = dev->ifindex; |
|
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); |
|
} |
|
|
|
atomic_dec(&tipc_net(sock_net(ub->ubsock->sk))->wq_count); |
|
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 */ |
|
atomic_inc(&tipc_net(sock_net(ub->ubsock->sk))->wq_count); |
|
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, |
|
.min_win = TIPC_DEF_LINK_WIN, |
|
.max_win = TIPC_DEF_LINK_WIN, |
|
.mtu = TIPC_DEF_LINK_UDP_MTU, |
|
.type_id = TIPC_MEDIA_TYPE_UDP, |
|
.hwaddr_len = 0, |
|
.name = "udp" |
|
};
|
|
|