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@@ -0,0 +1,442 @@
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+/* 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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+
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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 <linux/tipc_netlink.h>
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+#include "core.h"
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+#include "bearer.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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+static const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
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+ [TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC},
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+ [TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY,
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+ .len = sizeof(struct sockaddr_storage)},
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+ [TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY,
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+ .len = sizeof(struct sockaddr_storage)},
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+};
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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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+struct udp_media_addr {
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+ __be16 proto;
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+ __be16 udp_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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+
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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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+};
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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 (ntohs(ua->proto) == ETH_P_IP) {
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+ if (ipv4_is_multicast(ua->ipv4.s_addr))
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+ addr->broadcast = 1;
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+ } else if (ntohs(ua->proto) == ETH_P_IPV6) {
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+ if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST)
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+ addr->broadcast = 1;
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+ } else {
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+ pr_err("Invalid UDP media address\n");
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+ }
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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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+
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+ if (ntohs(ua->proto) == ETH_P_IP)
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+ snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_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->udp_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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+
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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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+
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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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+
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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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+
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+/* tipc_send_msg - enqueue a send request */
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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 *dest)
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+{
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+ int ttl, err = 0;
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+ struct udp_bearer *ub;
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+ struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value;
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+ struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
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+ struct sk_buff *clone;
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+ struct rtable *rt;
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+
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+ clone = skb_clone(skb, GFP_ATOMIC);
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+ skb_set_inner_protocol(clone, 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 tx_error;
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+ }
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+ if (htons(dst->proto) == 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 = clone->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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+ ttl = ip4_dst_hoplimit(&rt->dst);
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+ err = udp_tunnel_xmit_skb(rt, clone, src->ipv4.s_addr,
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+ dst->ipv4.s_addr, 0, ttl, 0,
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+ src->udp_port, dst->udp_port,
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+ false, true);
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+ if (err < 0) {
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+ ip_rt_put(rt);
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+ goto tx_error;
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+ }
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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 = ip6_dst_lookup(ub->ubsock->sk, &ndst, &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, clone, ndst->dev, &src->ipv6,
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+ &dst->ipv6, 0, ttl, src->udp_port,
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+ dst->udp_port, false);
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+#endif
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+ }
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+ return err;
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+
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+tx_error:
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+ kfree_skb(clone);
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+ return err;
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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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+
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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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+ kfree_skb(skb);
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+ return 0;
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+ }
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+
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+ skb_pull(skb, sizeof(struct udphdr));
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+ rcu_read_lock();
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+ b = rcu_dereference_rtnl(ub->bearer);
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+
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+ if (b) {
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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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+ rcu_read_unlock();
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+ kfree_skb(skb);
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+ return 0;
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+}
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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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+ if (!ipv4_is_multicast(remote->ipv4.s_addr))
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+ return 0;
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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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+ } else {
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+ if (!ipv6_addr_is_multicast(&remote->ipv6))
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+ return 0;
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+ err = __ipv6_sock_mc_join(sk, ub->ifindex, &remote->ipv6);
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+ }
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+ return err;
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+}
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+
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+/**
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+ * parse_options - build local/remote addresses from configuration
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+ * @attrs: netlink config data
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+ * @ub: UDP bearer instance
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+ * @local: local bearer IP address/port
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+ * @remote: peer or multicast IP/port
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+ */
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+static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub,
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+ struct udp_media_addr *local,
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+ struct udp_media_addr *remote)
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+{
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+ struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
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+ struct sockaddr_storage *sa_local, *sa_remote;
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+
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+ if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
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+ goto err;
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+ if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
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+ attrs[TIPC_NLA_BEARER_UDP_OPTS],
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+ tipc_nl_udp_policy))
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+ goto err;
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+ if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) {
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+ sa_local = nla_data(opts[TIPC_NLA_UDP_LOCAL]);
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+ sa_remote = nla_data(opts[TIPC_NLA_UDP_REMOTE]);
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+ } else {
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+err:
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+ pr_err("Invalid UDP bearer configuration");
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+ return -EINVAL;
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+ }
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+ if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET) {
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+ struct sockaddr_in *ip4;
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+
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+ ip4 = (struct sockaddr_in *)sa_local;
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+ local->proto = htons(ETH_P_IP);
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+ local->udp_port = ip4->sin_port;
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+ local->ipv4.s_addr = ip4->sin_addr.s_addr;
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+
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+ ip4 = (struct sockaddr_in *)sa_remote;
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+ remote->proto = htons(ETH_P_IP);
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+ remote->udp_port = ip4->sin_port;
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+ remote->ipv4.s_addr = ip4->sin_addr.s_addr;
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+ return 0;
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+
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+#if IS_ENABLED(CONFIG_IPV6)
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+ } else if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET6) {
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+ struct sockaddr_in6 *ip6;
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+
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+ ip6 = (struct sockaddr_in6 *)sa_local;
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+ local->proto = htons(ETH_P_IPV6);
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+ local->udp_port = ip6->sin6_port;
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+ local->ipv6 = ip6->sin6_addr;
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+ ub->ifindex = ip6->sin6_scope_id;
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+
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+ ip6 = (struct sockaddr_in6 *)sa_remote;
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+ remote->proto = htons(ETH_P_IPV6);
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+ remote->udp_port = ip6->sin6_port;
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+ remote->ipv6 = ip6->sin6_addr;
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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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+
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+/**
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+ * tipc_udp_enable - callback to create a new udp bearer instance
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+ * @net: network namespace
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+ * @b: pointer to generic tipc_bearer
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+ * @attrs: netlink bearer configuration
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+ *
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+ * validate the bearer parameters and initialize the udp bearer
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+ * rtnl_lock should be held
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+ */
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+static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
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+ struct nlattr *attrs[])
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+{
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+ int err = -EINVAL;
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+ struct udp_bearer *ub;
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+ struct udp_media_addr *remote;
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+ struct udp_media_addr local = {0};
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+ struct udp_port_cfg udp_conf = {0};
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+ struct udp_tunnel_sock_cfg tuncfg = {0};
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+
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+ ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
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+ if (!ub)
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+ return -ENOMEM;
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+
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+ remote = (struct udp_media_addr *)&b->bcast_addr.value;
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+ memset(remote, 0, sizeof(struct udp_media_addr));
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+ err = parse_options(attrs, ub, &local, remote);
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+ if (err)
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+ goto err;
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+
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+ b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
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+ b->bcast_addr.broadcast = 1;
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+ rcu_assign_pointer(b->media_ptr, ub);
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+ rcu_assign_pointer(ub->bearer, b);
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+ tipc_udp_media_addr_set(&b->addr, &local);
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+ if (htons(local.proto) == ETH_P_IP) {
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+ struct net_device *dev;
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+
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+ dev = __ip_dev_find(net, local.ipv4.s_addr, false);
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+ if (!dev) {
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+ err = -ENODEV;
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+ goto err;
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+ }
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+ udp_conf.family = AF_INET;
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+ udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
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+ udp_conf.use_udp_checksums = false;
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+ ub->ifindex = dev->ifindex;
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+ b->mtu = dev->mtu - sizeof(struct iphdr)
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+ - sizeof(struct udphdr);
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+#if IS_ENABLED(CONFIG_IPV6)
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|
+ } else if (htons(local.proto) == 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.udp_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);
|
|
|
+
|
|
|
+ if (enable_mcast(ub, remote))
|
|
|
+ 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);
|
|
|
+
|
|
|
+ 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(b->media_ptr, NULL);
|
|
|
+ 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"
|
|
|
+};
|
Erik Hugne