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04c26faa51
On some host, a crash could be triggered simply by repeating these
commands several times:
# modprobe tipc
# tipc bearer enable media udp name UDP1 localip 127.0.0.1
# rmmod tipc
[] BUG: unable to handle kernel paging request at ffffffffc096bb00
[] Workqueue: events 0xffffffffc096bb00
[] Call Trace:
[] ? process_one_work+0x1a7/0x360
[] ? worker_thread+0x30/0x390
[] ? create_worker+0x1a0/0x1a0
[] ? kthread+0x116/0x130
[] ? kthread_flush_work_fn+0x10/0x10
[] ? ret_from_fork+0x35/0x40
When removing the TIPC module, the UDP tunnel sock will be delayed to
release in a work queue as sock_release() can't be done in rtnl_lock().
If the work queue is schedule to run after the TIPC module is removed,
kernel will crash as the work queue function cleanup_beareri() code no
longer exists when trying to invoke it.
To fix it, this patch introduce a member wq_count in tipc_net to track
the numbers of work queues in schedule, and wait and exit until all
work queues are done in tipc_exit_net().
Fixes: d0f91938be
("tipc: add ip/udp media type")
Reported-by: Shuang Li <shuali@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
859 lines
22 KiB
C
859 lines
22 KiB
C
/* 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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/* IANA assigned UDP port */
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#define UDP_PORT_DEFAULT 6118
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#define UDP_MIN_HEADROOM 48
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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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/* 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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/* 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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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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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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/* 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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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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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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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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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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#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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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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return 0;
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}
|
|
|
|
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 nlattr **attrs = genl_dumpit_info(cb)->attrs;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
|
|
char *bname;
|
|
|
|
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
|
|
* @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"
|
|
};
|