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821 lines
20 KiB
821 lines
20 KiB
// 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, <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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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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|
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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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|
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/* per-network namespace private data for this module */ |
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|
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static unsigned int bareudp_net_id; |
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|
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struct bareudp_net { |
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struct list_head bareudp_list; |
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}; |
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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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|
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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 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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|
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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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|
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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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|
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if (bareudp->ethertype == htons(ETH_P_IP)) { |
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struct iphdr *iphdr; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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dev_sw_netstats_rx_add(bareudp->dev, len); |
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return sock; |
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} |
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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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|
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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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|
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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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|
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rcu_assign_pointer(bareudp->sock, sock); |
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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bareudp_sock_release(bareudp); |
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return 0; |
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} |
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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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|
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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, false); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (!sock) |
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return -ESHUTDOWN; |
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|
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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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|
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skb_tunnel_check_pmtu(skb, dst, BAREUDP_IPV6_HLEN + info->options_len, |
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false); |
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|
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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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|
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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 ipv6hdr); |
|
|
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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 bool bareudp_proto_valid(struct bareudp_dev *bareudp, __be16 proto) |
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{ |
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if (bareudp->ethertype == proto) |
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return true; |
|
|
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if (!bareudp->multi_proto_mode) |
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return false; |
|
|
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if (bareudp->ethertype == htons(ETH_P_MPLS_UC) && |
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proto == htons(ETH_P_MPLS_MC)) |
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return true; |
|
|
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if (bareudp->ethertype == htons(ETH_P_IP) && |
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proto == htons(ETH_P_IPV6)) |
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return true; |
|
|
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return false; |
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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 (!bareudp_proto_valid(bareudp, skb->protocol)) { |
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err = -EINVAL; |
|
goto tx_error; |
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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; |
|
tx_error: |
|
dev_kfree_skb(skb); |
|
|
|
if (err == -ELOOP) |
|
dev->stats.collisions++; |
|
else if (err == -ENETUNREACH) |
|
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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static int bareudp_fill_metadata_dst(struct net_device *dev, |
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struct sk_buff *skb) |
|
{ |
|
struct ip_tunnel_info *info = skb_tunnel_info(skb); |
|
struct bareudp_dev *bareudp = netdev_priv(dev); |
|
bool use_cache; |
|
|
|
use_cache = ip_tunnel_dst_cache_usable(skb, info); |
|
|
|
if (!IS_ENABLED(CONFIG_IPV6) || ip_tunnel_info_af(info) == AF_INET) { |
|
struct rtable *rt; |
|
__be32 saddr; |
|
|
|
rt = ip_route_output_tunnel(skb, dev, bareudp->net, &saddr, |
|
info, IPPROTO_UDP, use_cache); |
|
if (IS_ERR(rt)) |
|
return PTR_ERR(rt); |
|
|
|
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, |
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.ndo_get_stats64 = dev_get_tstats64, |
|
.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 const 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 | NETIF_F_FRAGLIST; |
|
dev->features |= NETIF_F_RXCSUM; |
|
dev->features |= NETIF_F_LLTX; |
|
dev->features |= NETIF_F_GSO_SOFTWARE; |
|
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; |
|
dev->hw_features |= 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 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 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) |
|
goto err_unconfig; |
|
|
|
return 0; |
|
|
|
err_unconfig: |
|
bareudp_dellink(dev, NULL); |
|
return err; |
|
} |
|
|
|
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; |
|
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, NULL); |
|
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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Interface driver for UDP encapsulated traffic");
|
|
|