![Richard Alpe](/assets/img/avatar_default.png)
Automatically learn UDP remote IP addresses of communicating peers by looking at the source IP address of incoming TIPC link configuration messages (neighbor discovery). This makes configuration slightly easier and removes the problematic scenario where a node receives directly addressed neighbor discovery messages sent using replicast which the node cannot "reply" to using mutlicast, leaving the link FSM in a limbo state. Signed-off-by: Richard Alpe <richard.alpe@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
638 lines
16 KiB
C
638 lines
16 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/addrconf.h>
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#include <linux/tipc_netlink.h>
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#include "core.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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/* 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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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 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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*/
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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 = 1;
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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)
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{
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int ttl, err = 0;
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struct rtable *rt;
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if (dst->proto == htons(ETH_P_IP)) {
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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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skb->dev = rt->dst.dev;
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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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struct dst_entry *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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err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
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&fl6);
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if (err)
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goto tx_error;
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ttl = ip6_dst_hoplimit(ndst);
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err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb,
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ndst->dev, &src->ipv6,
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&dst->ipv6, 0, ttl, 0, src->port,
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dst->port, false);
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#endif
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}
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return err;
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tx_error:
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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_rtnl(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 || list_empty(&ub->rcast.list))
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return tipc_udp_xmit(net, skb, ub, src, dst);
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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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if (err) {
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kfree_skb(_skb);
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goto out;
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}
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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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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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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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rcu_read_lock();
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b = rcu_dereference_rtnl(ub->bearer);
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if (!b)
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goto rcu_out;
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if (b && test_bit(0, &b->up)) {
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tipc_rcv(sock_net(sk), skb, b);
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rcu_read_unlock();
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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 rcu_out;
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}
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tipc_rcv(sock_net(sk), skb, b);
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rcu_read_unlock();
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return 0;
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rcu_out:
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rcu_read_unlock();
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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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err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
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&remote->ipv6);
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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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* tipc_parse_udp_addr - build udp media address from netlink data
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* @nlattr: netlink attribute containing sockaddr storage aligned address
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* @addr: tipc media address to fill with address, port and protocol type
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* @scope_id: IPv6 scope id pointer, not NULL indicates it's required
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*/
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static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
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u32 *scope_id)
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{
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struct sockaddr_storage sa;
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nla_memcpy(&sa, nla, sizeof(sa));
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if (sa.ss_family == AF_INET) {
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struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
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addr->proto = htons(ETH_P_IP);
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addr->port = ip4->sin_port;
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addr->ipv4.s_addr = ip4->sin_addr.s_addr;
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return 0;
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#if IS_ENABLED(CONFIG_IPV6)
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} else if (sa.ss_family == AF_INET6) {
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struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
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addr->proto = htons(ETH_P_IPV6);
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addr->port = ip6->sin6_port;
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memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
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/* Scope ID is only interesting for local addresses */
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if (scope_id) {
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int atype;
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atype = ipv6_addr_type(&ip6->sin6_addr);
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if (__ipv6_addr_needs_scope_id(atype) &&
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!ip6->sin6_scope_id) {
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return -EINVAL;
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}
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*scope_id = ip6->sin6_scope_id ? : 0;
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}
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return 0;
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#endif
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}
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return -EADDRNOTAVAIL;
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}
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int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
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{
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int err;
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struct udp_media_addr addr = {0};
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struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
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struct udp_media_addr *dst;
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if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy))
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return -EINVAL;
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if (!opts[TIPC_NLA_UDP_REMOTE])
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return -EINVAL;
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err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
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if (err)
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return err;
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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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pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
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return -EINVAL;
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}
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if (tipc_udp_is_known_peer(b, &addr))
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return 0;
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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];
|
|
|
|
ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
|
|
if (!ub)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&ub->rcast.list);
|
|
|
|
if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
|
|
goto err;
|
|
|
|
if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
|
|
attrs[TIPC_NLA_BEARER_UDP_OPTS],
|
|
tipc_nl_udp_policy))
|
|
goto err;
|
|
|
|
if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
|
|
pr_err("Invalid UDP bearer configuration");
|
|
return -EINVAL;
|
|
}
|
|
|
|
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;
|
|
|
|
b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
|
|
b->bcast_addr.broadcast = 1;
|
|
rcu_assign_pointer(b->media_ptr, ub);
|
|
rcu_assign_pointer(ub->bearer, b);
|
|
tipc_udp_media_addr_set(&b->addr, &local);
|
|
if (local.proto == htons(ETH_P_IP)) {
|
|
struct net_device *dev;
|
|
|
|
dev = __ip_dev_find(net, local.ipv4.s_addr, false);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto err;
|
|
}
|
|
udp_conf.family = AF_INET;
|
|
udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
|
|
udp_conf.use_udp_checksums = false;
|
|
ub->ifindex = dev->ifindex;
|
|
b->mtu = dev->mtu - sizeof(struct iphdr)
|
|
- sizeof(struct udphdr);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else if (local.proto == htons(ETH_P_IPV6)) {
|
|
udp_conf.family = AF_INET6;
|
|
udp_conf.use_udp6_tx_checksums = true;
|
|
udp_conf.use_udp6_rx_checksums = true;
|
|
udp_conf.local_ip6 = in6addr_any;
|
|
b->mtu = 1280;
|
|
#endif
|
|
} else {
|
|
err = -EAFNOSUPPORT;
|
|
goto err;
|
|
}
|
|
udp_conf.local_udp_port = local.port;
|
|
err = udp_sock_create(net, &udp_conf, &ub->ubsock);
|
|
if (err)
|
|
goto err;
|
|
tuncfg.sk_user_data = ub;
|
|
tuncfg.encap_type = 1;
|
|
tuncfg.encap_rcv = tipc_udp_recv;
|
|
tuncfg.encap_destroy = NULL;
|
|
setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
|
|
|
|
/**
|
|
* The bcast media address port is used for all peers and the ip
|
|
* is used if it's a multicast address.
|
|
*/
|
|
memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
|
|
if (tipc_udp_is_mcast_addr(&remote))
|
|
err = enable_mcast(ub, &remote);
|
|
else
|
|
err = tipc_udp_rcast_add(b, &remote);
|
|
if (err)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
kfree(ub);
|
|
return err;
|
|
}
|
|
|
|
/* cleanup_bearer - break the socket/bearer association */
|
|
static void cleanup_bearer(struct work_struct *work)
|
|
{
|
|
struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
|
|
struct udp_replicast *rcast, *tmp;
|
|
|
|
list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
|
|
list_del_rcu(&rcast->list);
|
|
kfree_rcu(rcast, rcu);
|
|
}
|
|
|
|
if (ub->ubsock)
|
|
udp_tunnel_sock_release(ub->ubsock);
|
|
synchronize_net();
|
|
kfree(ub);
|
|
}
|
|
|
|
/* tipc_udp_disable - detach bearer from socket */
|
|
static void tipc_udp_disable(struct tipc_bearer *b)
|
|
{
|
|
struct udp_bearer *ub;
|
|
|
|
ub = rcu_dereference_rtnl(b->media_ptr);
|
|
if (!ub) {
|
|
pr_err("UDP bearer instance not found\n");
|
|
return;
|
|
}
|
|
if (ub->ubsock)
|
|
sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
|
|
RCU_INIT_POINTER(ub->bearer, NULL);
|
|
|
|
/* sock_release need to be done outside of rtnl lock */
|
|
INIT_WORK(&ub->work, cleanup_bearer);
|
|
schedule_work(&ub->work);
|
|
}
|
|
|
|
struct tipc_media udp_media_info = {
|
|
.send_msg = tipc_udp_send_msg,
|
|
.enable_media = tipc_udp_enable,
|
|
.disable_media = tipc_udp_disable,
|
|
.addr2str = tipc_udp_addr2str,
|
|
.addr2msg = tipc_udp_addr2msg,
|
|
.msg2addr = tipc_udp_msg2addr,
|
|
.priority = TIPC_DEF_LINK_PRI,
|
|
.tolerance = TIPC_DEF_LINK_TOL,
|
|
.window = TIPC_DEF_LINK_WIN,
|
|
.type_id = TIPC_MEDIA_TYPE_UDP,
|
|
.hwaddr_len = 0,
|
|
.name = "udp"
|
|
};
|