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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Martin Varghese](/assets/img/avatar_default.png)
The commitfe80536acf
("bareudp: Added attribute to enable & disable rx metadata collection") breaks the the original(5.7) default behavior of bareudp module to collect RX metadadata at the receive. It was added to avoid the crash at the kernel neighbour subsytem when packet with metadata from bareudp is processed. But it is no more needed as the commit394de110a7
("net: Added pointer check for dst->ops->neigh_lookup in dst_neigh_lookup_skb") solves this crash. Fixes:fe80536acf
("bareudp: Added attribute to enable & disable rx metadata collection") Signed-off-by: Martin Varghese <martin.varghese@nokia.com> Acked-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
812 lines
20 KiB
C
812 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);
|
|
info->key.u.ipv4.src = saddr;
|
|
} else if (ip_tunnel_info_af(info) == AF_INET6) {
|
|
struct dst_entry *dst;
|
|
struct in6_addr saddr;
|
|
struct socket *sock = rcu_dereference(bareudp->sock);
|
|
|
|
dst = ip6_dst_lookup_tunnel(skb, dev, bareudp->net, sock,
|
|
&saddr, info, IPPROTO_UDP,
|
|
use_cache);
|
|
if (IS_ERR(dst))
|
|
return PTR_ERR(dst);
|
|
|
|
dst_release(dst);
|
|
info->key.u.ipv6.src = saddr;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
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)
|
|
{
|
|
memset(conf, 0, sizeof(*conf));
|
|
|
|
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]);
|
|
|
|
if (data[IFLA_BAREUDP_MULTIPROTO_MODE])
|
|
conf->multi_proto_mode = true;
|
|
|
|
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");
|