808 lines
20 KiB
C
808 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Bareudp: UDP tunnel encasulation for different Payload types like
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* MPLS, NSH, IP, etc.
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* Copyright (c) 2019 Nokia, Inc.
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* Authors: Martin Varghese, <martin.varghese@nokia.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/etherdevice.h>
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#include <linux/hash.h>
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#include <net/dst_metadata.h>
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#include <net/gro_cells.h>
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#include <net/rtnetlink.h>
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#include <net/protocol.h>
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#include <net/ip6_tunnel.h>
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#include <net/ip_tunnels.h>
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#include <net/udp_tunnel.h>
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#include <net/bareudp.h>
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#define BAREUDP_BASE_HLEN sizeof(struct udphdr)
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#define BAREUDP_IPV4_HLEN (sizeof(struct iphdr) + \
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sizeof(struct udphdr))
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#define BAREUDP_IPV6_HLEN (sizeof(struct ipv6hdr) + \
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sizeof(struct udphdr))
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static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
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/* per-network namespace private data for this module */
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static unsigned int bareudp_net_id;
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struct bareudp_net {
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struct list_head bareudp_list;
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};
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/* Pseudo network device */
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struct bareudp_dev {
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struct net *net; /* netns for packet i/o */
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struct net_device *dev; /* netdev for bareudp tunnel */
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__be16 ethertype;
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__be16 port;
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u16 sport_min;
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bool multi_proto_mode;
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struct socket __rcu *sock;
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struct list_head next; /* bareudp node on namespace list */
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struct gro_cells gro_cells;
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};
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static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct metadata_dst *tun_dst = NULL;
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struct pcpu_sw_netstats *stats;
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struct bareudp_dev *bareudp;
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unsigned short family;
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unsigned int len;
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__be16 proto;
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void *oiph;
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int err;
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bareudp = rcu_dereference_sk_user_data(sk);
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if (!bareudp)
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goto drop;
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if (skb->protocol == htons(ETH_P_IP))
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family = AF_INET;
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else
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family = AF_INET6;
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if (bareudp->ethertype == htons(ETH_P_IP)) {
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struct iphdr *iphdr;
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iphdr = (struct iphdr *)(skb->data + BAREUDP_BASE_HLEN);
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if (iphdr->version == 4) {
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proto = bareudp->ethertype;
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} else if (bareudp->multi_proto_mode && (iphdr->version == 6)) {
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proto = htons(ETH_P_IPV6);
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} else {
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bareudp->dev->stats.rx_dropped++;
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goto drop;
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}
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} else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) {
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struct iphdr *tunnel_hdr;
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tunnel_hdr = (struct iphdr *)skb_network_header(skb);
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if (tunnel_hdr->version == 4) {
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if (!ipv4_is_multicast(tunnel_hdr->daddr)) {
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proto = bareudp->ethertype;
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} else if (bareudp->multi_proto_mode &&
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ipv4_is_multicast(tunnel_hdr->daddr)) {
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proto = htons(ETH_P_MPLS_MC);
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} else {
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bareudp->dev->stats.rx_dropped++;
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goto drop;
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}
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} else {
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int addr_type;
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struct ipv6hdr *tunnel_hdr_v6;
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tunnel_hdr_v6 = (struct ipv6hdr *)skb_network_header(skb);
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addr_type =
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ipv6_addr_type((struct in6_addr *)&tunnel_hdr_v6->daddr);
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if (!(addr_type & IPV6_ADDR_MULTICAST)) {
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proto = bareudp->ethertype;
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} else if (bareudp->multi_proto_mode &&
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(addr_type & IPV6_ADDR_MULTICAST)) {
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proto = htons(ETH_P_MPLS_MC);
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} else {
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bareudp->dev->stats.rx_dropped++;
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goto drop;
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}
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}
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} else {
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proto = bareudp->ethertype;
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}
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if (iptunnel_pull_header(skb, BAREUDP_BASE_HLEN,
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proto,
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!net_eq(bareudp->net,
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dev_net(bareudp->dev)))) {
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bareudp->dev->stats.rx_dropped++;
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goto drop;
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}
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tun_dst = udp_tun_rx_dst(skb, family, TUNNEL_KEY, 0, 0);
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if (!tun_dst) {
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bareudp->dev->stats.rx_dropped++;
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goto drop;
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}
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skb_dst_set(skb, &tun_dst->dst);
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skb->dev = bareudp->dev;
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oiph = skb_network_header(skb);
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skb_reset_network_header(skb);
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if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET)
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err = IP_ECN_decapsulate(oiph, skb);
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else
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err = IP6_ECN_decapsulate(oiph, skb);
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if (unlikely(err)) {
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if (log_ecn_error) {
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if (!IS_ENABLED(CONFIG_IPV6) || family == AF_INET)
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net_info_ratelimited("non-ECT from %pI4 "
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"with TOS=%#x\n",
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&((struct iphdr *)oiph)->saddr,
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((struct iphdr *)oiph)->tos);
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else
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net_info_ratelimited("non-ECT from %pI6\n",
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&((struct ipv6hdr *)oiph)->saddr);
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}
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if (err > 1) {
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++bareudp->dev->stats.rx_frame_errors;
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++bareudp->dev->stats.rx_errors;
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goto drop;
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}
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}
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len = skb->len;
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err = gro_cells_receive(&bareudp->gro_cells, skb);
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if (likely(err == NET_RX_SUCCESS)) {
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stats = this_cpu_ptr(bareudp->dev->tstats);
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u64_stats_update_begin(&stats->syncp);
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stats->rx_packets++;
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stats->rx_bytes += len;
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u64_stats_update_end(&stats->syncp);
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}
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return 0;
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drop:
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/* Consume bad packet */
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kfree_skb(skb);
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return 0;
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}
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static int bareudp_err_lookup(struct sock *sk, struct sk_buff *skb)
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{
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return 0;
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}
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static int bareudp_init(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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int err;
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dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
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if (!dev->tstats)
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return -ENOMEM;
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err = gro_cells_init(&bareudp->gro_cells, dev);
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if (err) {
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free_percpu(dev->tstats);
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return err;
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}
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return 0;
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}
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static void bareudp_uninit(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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gro_cells_destroy(&bareudp->gro_cells);
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free_percpu(dev->tstats);
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}
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static struct socket *bareudp_create_sock(struct net *net, __be16 port)
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{
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struct udp_port_cfg udp_conf;
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struct socket *sock;
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int err;
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memset(&udp_conf, 0, sizeof(udp_conf));
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#if IS_ENABLED(CONFIG_IPV6)
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udp_conf.family = AF_INET6;
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#else
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udp_conf.family = AF_INET;
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#endif
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udp_conf.local_udp_port = port;
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/* Open UDP socket */
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err = udp_sock_create(net, &udp_conf, &sock);
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if (err < 0)
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return ERR_PTR(err);
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return sock;
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}
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/* Create new listen socket if needed */
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static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
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{
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struct udp_tunnel_sock_cfg tunnel_cfg;
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struct socket *sock;
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sock = bareudp_create_sock(bareudp->net, port);
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if (IS_ERR(sock))
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return PTR_ERR(sock);
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/* Mark socket as an encapsulation socket */
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memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
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tunnel_cfg.sk_user_data = bareudp;
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tunnel_cfg.encap_type = 1;
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tunnel_cfg.encap_rcv = bareudp_udp_encap_recv;
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tunnel_cfg.encap_err_lookup = bareudp_err_lookup;
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tunnel_cfg.encap_destroy = NULL;
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setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg);
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/* As the setup_udp_tunnel_sock does not call udp_encap_enable if the
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* socket type is v6 an explicit call to udp_encap_enable is needed.
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*/
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if (sock->sk->sk_family == AF_INET6)
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udp_encap_enable();
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rcu_assign_pointer(bareudp->sock, sock);
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return 0;
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}
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static int bareudp_open(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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int ret = 0;
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ret = bareudp_socket_create(bareudp, bareudp->port);
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return ret;
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}
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static void bareudp_sock_release(struct bareudp_dev *bareudp)
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{
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struct socket *sock;
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sock = bareudp->sock;
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rcu_assign_pointer(bareudp->sock, NULL);
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synchronize_net();
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udp_tunnel_sock_release(sock);
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}
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static int bareudp_stop(struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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bareudp_sock_release(bareudp);
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return 0;
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}
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static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
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struct bareudp_dev *bareudp,
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const struct ip_tunnel_info *info)
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{
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bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
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bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
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struct socket *sock = rcu_dereference(bareudp->sock);
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bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
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const struct ip_tunnel_key *key = &info->key;
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struct rtable *rt;
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__be16 sport, df;
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int min_headroom;
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__u8 tos, ttl;
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__be32 saddr;
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int err;
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if (!sock)
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return -ESHUTDOWN;
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rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, info,
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IPPROTO_UDP, use_cache);
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if (IS_ERR(rt))
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return PTR_ERR(rt);
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skb_tunnel_check_pmtu(skb, &rt->dst,
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BAREUDP_IPV4_HLEN + info->options_len);
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sport = udp_flow_src_port(bareudp->net, skb,
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bareudp->sport_min, USHRT_MAX,
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true);
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tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
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ttl = key->ttl;
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df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
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skb_scrub_packet(skb, xnet);
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err = -ENOSPC;
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if (!skb_pull(skb, skb_network_offset(skb)))
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goto free_dst;
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min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len +
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BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
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err = skb_cow_head(skb, min_headroom);
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if (unlikely(err))
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goto free_dst;
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err = udp_tunnel_handle_offloads(skb, udp_sum);
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if (err)
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goto free_dst;
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skb_set_inner_protocol(skb, bareudp->ethertype);
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udp_tunnel_xmit_skb(rt, sock->sk, skb, saddr, info->key.u.ipv4.dst,
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tos, ttl, df, sport, bareudp->port,
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!net_eq(bareudp->net, dev_net(bareudp->dev)),
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!(info->key.tun_flags & TUNNEL_CSUM));
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return 0;
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free_dst:
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dst_release(&rt->dst);
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return err;
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}
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static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
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struct bareudp_dev *bareudp,
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const struct ip_tunnel_info *info)
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{
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bool xnet = !net_eq(bareudp->net, dev_net(bareudp->dev));
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bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
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struct socket *sock = rcu_dereference(bareudp->sock);
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bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
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const struct ip_tunnel_key *key = &info->key;
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struct dst_entry *dst = NULL;
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struct in6_addr saddr, daddr;
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int min_headroom;
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__u8 prio, ttl;
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__be16 sport;
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int err;
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if (!sock)
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return -ESHUTDOWN;
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dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock, &saddr, info,
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IPPROTO_UDP, use_cache);
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if (IS_ERR(dst))
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return PTR_ERR(dst);
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skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len);
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sport = udp_flow_src_port(bareudp->net, skb,
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bareudp->sport_min, USHRT_MAX,
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true);
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prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
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ttl = key->ttl;
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skb_scrub_packet(skb, xnet);
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err = -ENOSPC;
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if (!skb_pull(skb, skb_network_offset(skb)))
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goto free_dst;
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min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
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BAREUDP_BASE_HLEN + info->options_len + sizeof(struct iphdr);
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err = skb_cow_head(skb, min_headroom);
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if (unlikely(err))
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goto free_dst;
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err = udp_tunnel_handle_offloads(skb, udp_sum);
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if (err)
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goto free_dst;
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daddr = info->key.u.ipv6.dst;
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udp_tunnel6_xmit_skb(dst, sock->sk, skb, dev,
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&saddr, &daddr, prio, ttl,
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info->key.label, sport, bareudp->port,
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!(info->key.tun_flags & TUNNEL_CSUM));
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return 0;
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free_dst:
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dst_release(dst);
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return err;
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}
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static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct bareudp_dev *bareudp = netdev_priv(dev);
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struct ip_tunnel_info *info = NULL;
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int err;
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if (skb->protocol != bareudp->ethertype) {
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if (!bareudp->multi_proto_mode ||
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(skb->protocol != htons(ETH_P_MPLS_MC) &&
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skb->protocol != htons(ETH_P_IPV6))) {
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err = -EINVAL;
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goto tx_error;
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}
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}
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info = skb_tunnel_info(skb);
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if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
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err = -EINVAL;
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goto tx_error;
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}
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rcu_read_lock();
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if (IS_ENABLED(CONFIG_IPV6) && info->mode & IP_TUNNEL_INFO_IPV6)
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err = bareudp6_xmit_skb(skb, dev, bareudp, info);
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else
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err = bareudp_xmit_skb(skb, dev, bareudp, info);
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rcu_read_unlock();
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if (likely(!err))
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return NETDEV_TX_OK;
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tx_error:
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dev_kfree_skb(skb);
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if (err == -ELOOP)
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dev->stats.collisions++;
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else if (err == -ENETUNREACH)
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dev->stats.tx_carrier_errors++;
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dev->stats.tx_errors++;
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return NETDEV_TX_OK;
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}
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static int bareudp_fill_metadata_dst(struct net_device *dev,
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struct sk_buff *skb)
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{
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struct ip_tunnel_info *info = skb_tunnel_info(skb);
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struct bareudp_dev *bareudp = netdev_priv(dev);
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bool use_cache;
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use_cache = ip_tunnel_dst_cache_usable(skb, info);
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if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) {
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struct rtable *rt;
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__be32 saddr;
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rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr,
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info, IPPROTO_UDP, use_cache);
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if (IS_ERR(rt))
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return PTR_ERR(rt);
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ip_rt_put(rt);
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info->key.u.ipv4.src = saddr;
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} else if (ip_tunnel_info_af(info) == AF_INET6) {
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struct dst_entry *dst;
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struct in6_addr saddr;
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struct socket *sock = rcu_dereference(bareudp->sock);
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dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
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&saddr, info, IPPROTO_UDP,
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use_cache);
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if (IS_ERR(dst))
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return PTR_ERR(dst);
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dst_release(dst);
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info->key.u.ipv6.src = saddr;
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} else {
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return -EINVAL;
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|
}
|
|
|
|
info->key.tp_src = udp_flow_src_port(bareudp->net, skb,
|
|
bareudp->sport_min,
|
|
USHRT_MAX, true);
|
|
info->key.tp_dst = bareudp->port;
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops bareudp_netdev_ops = {
|
|
.ndo_init = bareudp_init,
|
|
.ndo_uninit = bareudp_uninit,
|
|
.ndo_open = bareudp_open,
|
|
.ndo_stop = bareudp_stop,
|
|
.ndo_start_xmit = bareudp_xmit,
|
|
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
|
.ndo_fill_metadata_dst = bareudp_fill_metadata_dst,
|
|
};
|
|
|
|
static const struct nla_policy bareudp_policy[IFLA_BAREUDP_MAX + 1] = {
|
|
[IFLA_BAREUDP_PORT] = { .type = NLA_U16 },
|
|
[IFLA_BAREUDP_ETHERTYPE] = { .type = NLA_U16 },
|
|
[IFLA_BAREUDP_SRCPORT_MIN] = { .type = NLA_U16 },
|
|
[IFLA_BAREUDP_MULTIPROTO_MODE] = { .type = NLA_FLAG },
|
|
};
|
|
|
|
/* Info for udev, that this is a virtual tunnel endpoint */
|
|
static struct device_type bareudp_type = {
|
|
.name = "bareudp",
|
|
};
|
|
|
|
/* Initialize the device structure. */
|
|
static void bareudp_setup(struct net_device *dev)
|
|
{
|
|
dev->netdev_ops = &bareudp_netdev_ops;
|
|
dev->needs_free_netdev = true;
|
|
SET_NETDEV_DEVTYPE(dev, &bareudp_type);
|
|
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
|
|
dev->features |= NETIF_F_RXCSUM;
|
|
dev->features |= NETIF_F_GSO_SOFTWARE;
|
|
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
|
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
|
|
dev->hard_header_len = 0;
|
|
dev->addr_len = 0;
|
|
dev->mtu = ETH_DATA_LEN;
|
|
dev->min_mtu = IPV4_MIN_MTU;
|
|
dev->max_mtu = IP_MAX_MTU - BAREUDP_BASE_HLEN;
|
|
dev->type = ARPHRD_NONE;
|
|
netif_keep_dst(dev);
|
|
dev->priv_flags |= IFF_NO_QUEUE;
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
|
|
}
|
|
|
|
static int bareudp_validate(struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (!data) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Not enough attributes provided to perform the operation");
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (!data[IFLA_BAREUDP_PORT]) {
|
|
NL_SET_ERR_MSG(extack, "port not specified");
|
|
return -EINVAL;
|
|
}
|
|
if (!data[IFLA_BAREUDP_ETHERTYPE]) {
|
|
NL_SET_ERR_MSG(extack, "ethertype not specified");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (data[IFLA_BAREUDP_PORT])
|
|
conf->port = nla_get_u16(data[IFLA_BAREUDP_PORT]);
|
|
|
|
if (data[IFLA_BAREUDP_ETHERTYPE])
|
|
conf->ethertype = nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
|
|
|
|
if (data[IFLA_BAREUDP_SRCPORT_MIN])
|
|
conf->sport_min = nla_get_u16(data[IFLA_BAREUDP_SRCPORT_MIN]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct bareudp_dev *bareudp_find_dev(struct bareudp_net *bn,
|
|
const struct bareudp_conf *conf)
|
|
{
|
|
struct bareudp_dev *bareudp, *t = NULL;
|
|
|
|
list_for_each_entry(bareudp, &bn->bareudp_list, next) {
|
|
if (conf->port == bareudp->port)
|
|
t = bareudp;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
static int bareudp_configure(struct net *net, struct net_device *dev,
|
|
struct bareudp_conf *conf)
|
|
{
|
|
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
|
|
struct bareudp_dev *t, *bareudp = netdev_priv(dev);
|
|
int err;
|
|
|
|
bareudp->net = net;
|
|
bareudp->dev = dev;
|
|
t = bareudp_find_dev(bn, conf);
|
|
if (t)
|
|
return -EBUSY;
|
|
|
|
if (conf->multi_proto_mode &&
|
|
(conf->ethertype != htons(ETH_P_MPLS_UC) &&
|
|
conf->ethertype != htons(ETH_P_IP)))
|
|
return -EINVAL;
|
|
|
|
bareudp->port = conf->port;
|
|
bareudp->ethertype = conf->ethertype;
|
|
bareudp->sport_min = conf->sport_min;
|
|
bareudp->multi_proto_mode = conf->multi_proto_mode;
|
|
err = register_netdevice(dev);
|
|
if (err)
|
|
return err;
|
|
|
|
list_add(&bareudp->next, &bn->bareudp_list);
|
|
return 0;
|
|
}
|
|
|
|
static int bareudp_link_config(struct net_device *dev,
|
|
struct nlattr *tb[])
|
|
{
|
|
int err;
|
|
|
|
if (tb[IFLA_MTU]) {
|
|
err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int bareudp_newlink(struct net *net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct bareudp_conf conf;
|
|
int err;
|
|
|
|
err = bareudp2info(data, &conf, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
err = bareudp_configure(net, dev, &conf);
|
|
if (err)
|
|
return err;
|
|
|
|
err = bareudp_link_config(dev, tb);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bareudp_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct bareudp_dev *bareudp = netdev_priv(dev);
|
|
|
|
list_del(&bareudp->next);
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
static size_t bareudp_get_size(const struct net_device *dev)
|
|
{
|
|
return nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_PORT */
|
|
nla_total_size(sizeof(__be16)) + /* IFLA_BAREUDP_ETHERTYPE */
|
|
nla_total_size(sizeof(__u16)) + /* IFLA_BAREUDP_SRCPORT_MIN */
|
|
nla_total_size(0) + /* IFLA_BAREUDP_MULTIPROTO_MODE */
|
|
0;
|
|
}
|
|
|
|
static int bareudp_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct bareudp_dev *bareudp = netdev_priv(dev);
|
|
|
|
if (nla_put_be16(skb, IFLA_BAREUDP_PORT, bareudp->port))
|
|
goto nla_put_failure;
|
|
if (nla_put_be16(skb, IFLA_BAREUDP_ETHERTYPE, bareudp->ethertype))
|
|
goto nla_put_failure;
|
|
if (nla_put_u16(skb, IFLA_BAREUDP_SRCPORT_MIN, bareudp->sport_min))
|
|
goto nla_put_failure;
|
|
if (bareudp->multi_proto_mode &&
|
|
nla_put_flag(skb, IFLA_BAREUDP_MULTIPROTO_MODE))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static struct rtnl_link_ops bareudp_link_ops __read_mostly = {
|
|
.kind = "bareudp",
|
|
.maxtype = IFLA_BAREUDP_MAX,
|
|
.policy = bareudp_policy,
|
|
.priv_size = sizeof(struct bareudp_dev),
|
|
.setup = bareudp_setup,
|
|
.validate = bareudp_validate,
|
|
.newlink = bareudp_newlink,
|
|
.dellink = bareudp_dellink,
|
|
.get_size = bareudp_get_size,
|
|
.fill_info = bareudp_fill_info,
|
|
};
|
|
|
|
struct net_device *bareudp_dev_create(struct net *net, const char *name,
|
|
u8 name_assign_type,
|
|
struct bareudp_conf *conf)
|
|
{
|
|
struct nlattr *tb[IFLA_MAX + 1];
|
|
struct net_device *dev;
|
|
LIST_HEAD(list_kill);
|
|
int err;
|
|
|
|
memset(tb, 0, sizeof(tb));
|
|
dev = rtnl_create_link(net, name, name_assign_type,
|
|
&bareudp_link_ops, tb, NULL);
|
|
if (IS_ERR(dev))
|
|
return dev;
|
|
|
|
err = bareudp_configure(net, dev, conf);
|
|
if (err) {
|
|
free_netdev(dev);
|
|
return ERR_PTR(err);
|
|
}
|
|
err = dev_set_mtu(dev, IP_MAX_MTU - BAREUDP_BASE_HLEN);
|
|
if (err)
|
|
goto err;
|
|
|
|
err = rtnl_configure_link(dev, NULL);
|
|
if (err < 0)
|
|
goto err;
|
|
|
|
return dev;
|
|
err:
|
|
bareudp_dellink(dev, &list_kill);
|
|
unregister_netdevice_many(&list_kill);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bareudp_dev_create);
|
|
|
|
static __net_init int bareudp_init_net(struct net *net)
|
|
{
|
|
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
|
|
|
|
INIT_LIST_HEAD(&bn->bareudp_list);
|
|
return 0;
|
|
}
|
|
|
|
static void bareudp_destroy_tunnels(struct net *net, struct list_head *head)
|
|
{
|
|
struct bareudp_net *bn = net_generic(net, bareudp_net_id);
|
|
struct bareudp_dev *bareudp, *next;
|
|
|
|
list_for_each_entry_safe(bareudp, next, &bn->bareudp_list, next)
|
|
unregister_netdevice_queue(bareudp->dev, head);
|
|
}
|
|
|
|
static void __net_exit bareudp_exit_batch_net(struct list_head *net_list)
|
|
{
|
|
struct net *net;
|
|
LIST_HEAD(list);
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry(net, net_list, exit_list)
|
|
bareudp_destroy_tunnels(net, &list);
|
|
|
|
/* unregister the devices gathered above */
|
|
unregister_netdevice_many(&list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations bareudp_net_ops = {
|
|
.init = bareudp_init_net,
|
|
.exit_batch = bareudp_exit_batch_net,
|
|
.id = &bareudp_net_id,
|
|
.size = sizeof(struct bareudp_net),
|
|
};
|
|
|
|
static int __init bareudp_init_module(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = register_pernet_subsys(&bareudp_net_ops);
|
|
if (rc)
|
|
goto out1;
|
|
|
|
rc = rtnl_link_register(&bareudp_link_ops);
|
|
if (rc)
|
|
goto out2;
|
|
|
|
return 0;
|
|
out2:
|
|
unregister_pernet_subsys(&bareudp_net_ops);
|
|
out1:
|
|
return rc;
|
|
}
|
|
late_initcall(bareudp_init_module);
|
|
|
|
static void __exit bareudp_cleanup_module(void)
|
|
{
|
|
rtnl_link_unregister(&bareudp_link_ops);
|
|
unregister_pernet_subsys(&bareudp_net_ops);
|
|
}
|
|
module_exit(bareudp_cleanup_module);
|
|
|
|
MODULE_ALIAS_RTNL_LINK("bareudp");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Martin Varghese <martin.varghese@nokia.com>");
|
|
MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
|