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net/ipv4/ip_tunnel.c
29.6 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * Copyright (c) 2013 Nicira, Inc. |
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*/ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/capability.h> #include <linux/module.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/uaccess.h> #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/in.h> #include <linux/tcp.h> #include <linux/udp.h> #include <linux/if_arp.h> |
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#include <linux/init.h> #include <linux/in6.h> #include <linux/inetdevice.h> #include <linux/igmp.h> #include <linux/netfilter_ipv4.h> #include <linux/etherdevice.h> #include <linux/if_ether.h> #include <linux/if_vlan.h> #include <linux/rculist.h> |
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#include <linux/err.h> |
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#include <net/sock.h> #include <net/ip.h> #include <net/icmp.h> #include <net/protocol.h> #include <net/ip_tunnels.h> #include <net/arp.h> #include <net/checksum.h> #include <net/dsfield.h> #include <net/inet_ecn.h> #include <net/xfrm.h> #include <net/net_namespace.h> #include <net/netns/generic.h> #include <net/rtnetlink.h> |
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#include <net/udp.h> |
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#include <net/dst_metadata.h> |
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#if IS_ENABLED(CONFIG_IPV6) #include <net/ipv6.h> #include <net/ip6_fib.h> #include <net/ip6_route.h> #endif |
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static unsigned int ip_tunnel_hash(__be32 key, __be32 remote) |
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{ return hash_32((__force u32)key ^ (__force u32)remote, IP_TNL_HASH_BITS); } |
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static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p, __be16 flags, __be32 key) { if (p->i_flags & TUNNEL_KEY) { if (flags & TUNNEL_KEY) return key == p->i_key; else /* key expected, none present */ return false; } else return !(flags & TUNNEL_KEY); } /* Fallback tunnel: no source, no destination, no key, no options Tunnel hash table: We require exact key match i.e. if a key is present in packet it will match only tunnel with the same key; if it is not present, it will match only keyless tunnel. All keysless packets, if not matched configured keyless tunnels will match fallback tunnel. Given src, dst and key, find appropriate for input tunnel. */ struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, int link, __be16 flags, __be32 remote, __be32 local, __be32 key) { unsigned int hash; struct ip_tunnel *t, *cand = NULL; struct hlist_head *head; |
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hash = ip_tunnel_hash(key, remote); |
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head = &itn->tunnels[hash]; hlist_for_each_entry_rcu(t, head, hash_node) { if (local != t->parms.iph.saddr || remote != t->parms.iph.daddr || !(t->dev->flags & IFF_UP)) continue; if (!ip_tunnel_key_match(&t->parms, flags, key)) continue; if (t->parms.link == link) return t; else cand = t; } hlist_for_each_entry_rcu(t, head, hash_node) { if (remote != t->parms.iph.daddr || |
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t->parms.iph.saddr != 0 || |
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!(t->dev->flags & IFF_UP)) continue; if (!ip_tunnel_key_match(&t->parms, flags, key)) continue; if (t->parms.link == link) return t; else if (!cand) cand = t; } |
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hash = ip_tunnel_hash(key, 0); |
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head = &itn->tunnels[hash]; hlist_for_each_entry_rcu(t, head, hash_node) { |
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if ((local != t->parms.iph.saddr || t->parms.iph.daddr != 0) && (local != t->parms.iph.daddr || !ipv4_is_multicast(local))) continue; if (!(t->dev->flags & IFF_UP)) |
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continue; if (!ip_tunnel_key_match(&t->parms, flags, key)) continue; if (t->parms.link == link) return t; else if (!cand) cand = t; } if (flags & TUNNEL_NO_KEY) goto skip_key_lookup; hlist_for_each_entry_rcu(t, head, hash_node) { if (t->parms.i_key != key || |
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t->parms.iph.saddr != 0 || t->parms.iph.daddr != 0 || |
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!(t->dev->flags & IFF_UP)) continue; if (t->parms.link == link) return t; else if (!cand) cand = t; } skip_key_lookup: if (cand) return cand; |
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t = rcu_dereference(itn->collect_md_tun); |
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if (t && t->dev->flags & IFF_UP) |
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return t; |
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if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP) return netdev_priv(itn->fb_tunnel_dev); |
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return NULL; } EXPORT_SYMBOL_GPL(ip_tunnel_lookup); static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn, struct ip_tunnel_parm *parms) { unsigned int h; __be32 remote; |
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__be32 i_key = parms->i_key; |
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if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr)) remote = parms->iph.daddr; else remote = 0; |
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if (!(parms->i_flags & TUNNEL_KEY) && (parms->i_flags & VTI_ISVTI)) i_key = 0; h = ip_tunnel_hash(i_key, remote); |
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return &itn->tunnels[h]; } static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t) { struct hlist_head *head = ip_bucket(itn, &t->parms); |
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if (t->collect_md) rcu_assign_pointer(itn->collect_md_tun, t); |
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hlist_add_head_rcu(&t->hash_node, head); } |
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static void ip_tunnel_del(struct ip_tunnel_net *itn, struct ip_tunnel *t) |
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{ |
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if (t->collect_md) rcu_assign_pointer(itn->collect_md_tun, NULL); |
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hlist_del_init_rcu(&t->hash_node); } static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn, struct ip_tunnel_parm *parms, int type) { __be32 remote = parms->iph.daddr; __be32 local = parms->iph.saddr; __be32 key = parms->i_key; |
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__be16 flags = parms->i_flags; |
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int link = parms->link; struct ip_tunnel *t = NULL; struct hlist_head *head = ip_bucket(itn, parms); hlist_for_each_entry_rcu(t, head, hash_node) { if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr && |
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link == t->parms.link && |
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type == t->dev->type && ip_tunnel_key_match(&t->parms, flags, key)) |
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break; } return t; } static struct net_device *__ip_tunnel_create(struct net *net, const struct rtnl_link_ops *ops, struct ip_tunnel_parm *parms) { int err; struct ip_tunnel *tunnel; struct net_device *dev; char name[IFNAMSIZ]; |
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err = -E2BIG; if (parms->name[0]) { if (!dev_valid_name(parms->name)) goto failed; |
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strlcpy(name, parms->name, IFNAMSIZ); |
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} else { if (strlen(ops->kind) > (IFNAMSIZ - 3)) |
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goto failed; |
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strcpy(name, ops->kind); strcat(name, "%d"); |
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} ASSERT_RTNL(); |
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dev = alloc_netdev(ops->priv_size, name, NET_NAME_UNKNOWN, ops->setup); |
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if (!dev) { err = -ENOMEM; goto failed; } dev_net_set(dev, net); dev->rtnl_link_ops = ops; tunnel = netdev_priv(dev); tunnel->parms = *parms; |
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tunnel->net = net; |
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err = register_netdevice(dev); if (err) goto failed_free; return dev; failed_free: free_netdev(dev); failed: return ERR_PTR(err); } |
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static int ip_tunnel_bind_dev(struct net_device *dev) { struct net_device *tdev = NULL; struct ip_tunnel *tunnel = netdev_priv(dev); const struct iphdr *iph; int hlen = LL_MAX_HEADER; int mtu = ETH_DATA_LEN; int t_hlen = tunnel->hlen + sizeof(struct iphdr); iph = &tunnel->parms.iph; /* Guess output device to choose reasonable mtu and needed_headroom */ if (iph->daddr) { struct flowi4 fl4; struct rtable *rt; |
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ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr, iph->saddr, tunnel->parms.o_key, RT_TOS(iph->tos), tunnel->parms.link, |
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tunnel->fwmark, 0); |
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rt = ip_route_output_key(tunnel->net, &fl4); |
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if (!IS_ERR(rt)) { tdev = rt->dst.dev; ip_rt_put(rt); } if (dev->type != ARPHRD_ETHER) dev->flags |= IFF_POINTOPOINT; |
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dst_cache_reset(&tunnel->dst_cache); |
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} if (!tdev && tunnel->parms.link) |
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tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); |
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if (tdev) { hlen = tdev->hard_header_len + tdev->needed_headroom; |
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mtu = min(tdev->mtu, IP_MAX_MTU); |
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} |
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dev->needed_headroom = t_hlen + hlen; mtu -= (dev->hard_header_len + t_hlen); |
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if (mtu < IPV4_MIN_MTU) mtu = IPV4_MIN_MTU; |
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return mtu; } static struct ip_tunnel *ip_tunnel_create(struct net *net, struct ip_tunnel_net *itn, struct ip_tunnel_parm *parms) { |
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struct ip_tunnel *nt; |
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struct net_device *dev; |
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int t_hlen; |
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int mtu; int err; |
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dev = __ip_tunnel_create(net, itn->rtnl_link_ops, parms); |
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if (IS_ERR(dev)) |
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return ERR_CAST(dev); |
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mtu = ip_tunnel_bind_dev(dev); err = dev_set_mtu(dev, mtu); if (err) goto err_dev_set_mtu; |
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nt = netdev_priv(dev); |
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t_hlen = nt->hlen + sizeof(struct iphdr); dev->min_mtu = ETH_MIN_MTU; |
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dev->max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen; |
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ip_tunnel_add(itn, nt); return nt; |
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err_dev_set_mtu: unregister_netdevice(dev); return ERR_PTR(err); |
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} int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, |
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const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, bool log_ecn_error) |
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{ |
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struct pcpu_sw_netstats *tstats; |
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const struct iphdr *iph = ip_hdr(skb); int err; |
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#ifdef CONFIG_NET_IPGRE_BROADCAST if (ipv4_is_multicast(iph->daddr)) { |
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tunnel->dev->stats.multicast++; skb->pkt_type = PACKET_BROADCAST; } #endif if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) || ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) { tunnel->dev->stats.rx_crc_errors++; tunnel->dev->stats.rx_errors++; goto drop; } if (tunnel->parms.i_flags&TUNNEL_SEQ) { if (!(tpi->flags&TUNNEL_SEQ) || (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { tunnel->dev->stats.rx_fifo_errors++; tunnel->dev->stats.rx_errors++; goto drop; } tunnel->i_seqno = ntohl(tpi->seq) + 1; } |
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skb_reset_network_header(skb); |
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err = IP_ECN_decapsulate(iph, skb); if (unlikely(err)) { if (log_ecn_error) net_info_ratelimited("non-ECT from %pI4 with TOS=%#x ", &iph->saddr, iph->tos); if (err > 1) { ++tunnel->dev->stats.rx_frame_errors; ++tunnel->dev->stats.rx_errors; goto drop; } } tstats = this_cpu_ptr(tunnel->dev->tstats); u64_stats_update_begin(&tstats->syncp); tstats->rx_packets++; tstats->rx_bytes += skb->len; u64_stats_update_end(&tstats->syncp); |
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skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); |
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if (tunnel->dev->type == ARPHRD_ETHER) { skb->protocol = eth_type_trans(skb, tunnel->dev); skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); } else { skb->dev = tunnel->dev; } |
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if (tun_dst) skb_dst_set(skb, (struct dst_entry *)tun_dst); |
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gro_cells_receive(&tunnel->gro_cells, skb); return 0; drop: |
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if (tun_dst) dst_release((struct dst_entry *)tun_dst); |
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kfree_skb(skb); return 0; } EXPORT_SYMBOL_GPL(ip_tunnel_rcv); |
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int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops, unsigned int num) { |
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if (num >= MAX_IPTUN_ENCAP_OPS) return -ERANGE; |
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return !cmpxchg((const struct ip_tunnel_encap_ops **) &iptun_encaps[num], NULL, ops) ? 0 : -1; |
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} |
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EXPORT_SYMBOL(ip_tunnel_encap_add_ops); int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, unsigned int num) { int ret; |
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if (num >= MAX_IPTUN_ENCAP_OPS) return -ERANGE; |
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ret = (cmpxchg((const struct ip_tunnel_encap_ops **) &iptun_encaps[num], ops, NULL) == ops) ? 0 : -1; synchronize_net(); return ret; } EXPORT_SYMBOL(ip_tunnel_encap_del_ops); |
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int ip_tunnel_encap_setup(struct ip_tunnel *t, struct ip_tunnel_encap *ipencap) { int hlen; memset(&t->encap, 0, sizeof(t->encap)); hlen = ip_encap_hlen(ipencap); if (hlen < 0) return hlen; t->encap.type = ipencap->type; t->encap.sport = ipencap->sport; t->encap.dport = ipencap->dport; t->encap.flags = ipencap->flags; t->encap_hlen = hlen; t->hlen = t->encap_hlen + t->tun_hlen; return 0; } EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup); |
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static int tnl_update_pmtu(struct net_device *dev, struct sk_buff *skb, |
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struct rtable *rt, __be16 df, |
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const struct iphdr *inner_iph, int tunnel_hlen, __be32 dst, bool md) |
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{ struct ip_tunnel *tunnel = netdev_priv(dev); |
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int pkt_size; |
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int mtu; |
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tunnel_hlen = md ? tunnel_hlen : tunnel->hlen; pkt_size = skb->len - tunnel_hlen - dev->hard_header_len; |
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if (df) mtu = dst_mtu(&rt->dst) - dev->hard_header_len |
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- sizeof(struct iphdr) - tunnel_hlen; |
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else |
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mtu = skb_valid_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
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if (skb_valid_dst(skb)) skb_dst_update_pmtu(skb, mtu); |
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if (skb->protocol == htons(ETH_P_IP)) { if (!skb_is_gso(skb) && |
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(inner_iph->frag_off & htons(IP_DF)) && mtu < pkt_size) { |
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memset(IPCB(skb), 0, sizeof(*IPCB(skb))); icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); return -E2BIG; } } #if IS_ENABLED(CONFIG_IPV6) else if (skb->protocol == htons(ETH_P_IPV6)) { |
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struct rt6_info *rt6; |
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__be32 daddr; |
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rt6 = skb_valid_dst(skb) ? (struct rt6_info *)skb_dst(skb) : NULL; |
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daddr = md ? dst : tunnel->parms.iph.daddr; |
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if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
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if ((daddr && !ipv4_is_multicast(daddr)) || |
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rt6->rt6i_dst.plen == 128) { rt6->rt6i_flags |= RTF_MODIFIED; dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); } } if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU && mtu < pkt_size) { icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); return -E2BIG; } } #endif return 0; } |
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void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, u8 proto, int tunnel_hlen) |
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{ struct ip_tunnel *tunnel = netdev_priv(dev); u32 headroom = sizeof(struct iphdr); struct ip_tunnel_info *tun_info; const struct ip_tunnel_key *key; const struct iphdr *inner_iph; |
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struct rtable *rt = NULL; |
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struct flowi4 fl4; __be16 df = 0; u8 tos, ttl; |
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bool use_cache; |
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tun_info = skb_tunnel_info(skb); if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || ip_tunnel_info_af(tun_info) != AF_INET)) goto tx_error; key = &tun_info->key; memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); inner_iph = (const struct iphdr *)skb_inner_network_header(skb); tos = key->tos; if (tos == 1) { if (skb->protocol == htons(ETH_P_IP)) tos = inner_iph->tos; else if (skb->protocol == htons(ETH_P_IPV6)) tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); } |
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ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src, tunnel_id_to_key32(key->tun_id), RT_TOS(tos), |
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0, skb->mark, skb_get_hash(skb)); |
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if (tunnel->encap.type != TUNNEL_ENCAP_NONE) goto tx_error; |
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use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); if (use_cache) rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr); if (!rt) { rt = ip_route_output_key(tunnel->net, &fl4); if (IS_ERR(rt)) { dev->stats.tx_carrier_errors++; goto tx_error; } if (use_cache) dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, fl4.saddr); |
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} if (rt->dst.dev == dev) { ip_rt_put(rt); dev->stats.collisions++; goto tx_error; } |
c8b34e680
|
570 571 572 573 574 575 576 577 |
if (key->tun_flags & TUNNEL_DONT_FRAGMENT) df = htons(IP_DF); if (tnl_update_pmtu(dev, skb, rt, df, inner_iph, tunnel_hlen, key->u.ipv4.dst, true)) { ip_rt_put(rt); goto tx_error; } |
cfc7381b3
|
578 579 580 581 582 583 584 585 586 587 |
tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); ttl = key->ttl; if (ttl == 0) { if (skb->protocol == htons(ETH_P_IP)) ttl = inner_iph->ttl; else if (skb->protocol == htons(ETH_P_IPV6)) ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; else ttl = ip4_dst_hoplimit(&rt->dst); } |
c8b34e680
|
588 589 |
if (!df && skb->protocol == htons(ETH_P_IP)) |
cfc7381b3
|
590 |
df = inner_iph->frag_off & htons(IP_DF); |
c8b34e680
|
591 |
|
cfc7381b3
|
592 593 594 595 596 597 598 599 |
headroom += LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len; if (headroom > dev->needed_headroom) dev->needed_headroom = headroom; if (skb_cow_head(skb, dev->needed_headroom)) { ip_rt_put(rt); goto tx_dropped; } |
0f693f199
|
600 601 |
iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, proto, tos, ttl, df, !net_eq(tunnel->net, dev_net(dev))); |
cfc7381b3
|
602 603 604 605 606 607 608 609 610 611 |
return; tx_error: dev->stats.tx_errors++; goto kfree; tx_dropped: dev->stats.tx_dropped++; kfree: kfree_skb(skb); } EXPORT_SYMBOL_GPL(ip_md_tunnel_xmit); |
c54419321
|
612 |
void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
563284865
|
613 |
const struct iphdr *tnl_params, u8 protocol) |
c54419321
|
614 615 |
{ struct ip_tunnel *tunnel = netdev_priv(dev); |
186d93669
|
616 |
struct ip_tunnel_info *tun_info = NULL; |
c54419321
|
617 |
const struct iphdr *inner_iph; |
c54419321
|
618 |
unsigned int max_headroom; /* The extra header space needed */ |
186d93669
|
619 620 621 622 |
struct rtable *rt = NULL; /* Route to the other host */ bool use_cache = false; struct flowi4 fl4; bool md = false; |
22fb22eae
|
623 |
bool connected; |
186d93669
|
624 625 626 |
u8 tos, ttl; __be32 dst; __be16 df; |
c54419321
|
627 628 |
inner_iph = (const struct iphdr *)skb_inner_network_header(skb); |
22fb22eae
|
629 |
connected = (tunnel->parms.iph.daddr != 0); |
c54419321
|
630 |
|
5146d1f15
|
631 |
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
c54419321
|
632 633 634 |
dst = tnl_params->daddr; if (dst == 0) { /* NBMA tunnel */ |
51456b291
|
635 |
if (!skb_dst(skb)) { |
c54419321
|
636 637 638 |
dev->stats.tx_fifo_errors++; goto tx_error; } |
d71b57532
|
639 640 641 |
tun_info = skb_tunnel_info(skb); if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX) && ip_tunnel_info_af(tun_info) == AF_INET && |
186d93669
|
642 |
tun_info->key.u.ipv4.dst) { |
d71b57532
|
643 |
dst = tun_info->key.u.ipv4.dst; |
186d93669
|
644 645 646 |
md = true; connected = true; } |
d71b57532
|
647 |
else if (skb->protocol == htons(ETH_P_IP)) { |
c54419321
|
648 649 650 651 652 653 654 655 656 657 658 659 |
rt = skb_rtable(skb); dst = rt_nexthop(rt, inner_iph->daddr); } #if IS_ENABLED(CONFIG_IPV6) else if (skb->protocol == htons(ETH_P_IPV6)) { const struct in6_addr *addr6; struct neighbour *neigh; bool do_tx_error_icmp; int addr_type; neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr); |
51456b291
|
660 |
if (!neigh) |
c54419321
|
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 |
goto tx_error; addr6 = (const struct in6_addr *)&neigh->primary_key; addr_type = ipv6_addr_type(addr6); if (addr_type == IPV6_ADDR_ANY) { addr6 = &ipv6_hdr(skb)->daddr; addr_type = ipv6_addr_type(addr6); } if ((addr_type & IPV6_ADDR_COMPATv4) == 0) do_tx_error_icmp = true; else { do_tx_error_icmp = false; dst = addr6->s6_addr32[3]; } neigh_release(neigh); if (do_tx_error_icmp) goto tx_error_icmp; } #endif else goto tx_error; |
7d442fab0
|
684 |
|
186d93669
|
685 686 |
if (!md) connected = false; |
c54419321
|
687 688 689 690 691 |
} tos = tnl_params->tos; if (tos & 0x1) { tos &= ~0x1; |
7d442fab0
|
692 |
if (skb->protocol == htons(ETH_P_IP)) { |
c54419321
|
693 |
tos = inner_iph->tos; |
7d442fab0
|
694 695 |
connected = false; } else if (skb->protocol == htons(ETH_P_IPV6)) { |
c54419321
|
696 |
tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph); |
7d442fab0
|
697 698 |
connected = false; } |
c54419321
|
699 |
} |
0f3e9c97e
|
700 701 |
ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr, tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link, |
24ba14406
|
702 |
tunnel->fwmark, skb_get_hash(skb)); |
7d442fab0
|
703 |
|
563284865
|
704 705 |
if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) goto tx_error; |
186d93669
|
706 707 708 709 710 711 712 713 714 |
if (connected && md) { use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); if (use_cache) rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl4.saddr); } else { rt = connected ? dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr) : NULL; } |
7d442fab0
|
715 716 717 718 719 720 721 722 |
if (!rt) { rt = ip_route_output_key(tunnel->net, &fl4); if (IS_ERR(rt)) { dev->stats.tx_carrier_errors++; goto tx_error; } |
186d93669
|
723 724 725 726 |
if (use_cache) dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, fl4.saddr); else if (!md && connected) |
e09acddf8
|
727 728 |
dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); |
c54419321
|
729 |
} |
7d442fab0
|
730 |
|
0e6fbc5b6
|
731 |
if (rt->dst.dev == dev) { |
c54419321
|
732 733 734 735 |
ip_rt_put(rt); dev->stats.collisions++; goto tx_error; } |
c54419321
|
736 |
|
c8b34e680
|
737 738 |
if (tnl_update_pmtu(dev, skb, rt, tnl_params->frag_off, inner_iph, 0, 0, false)) { |
23a3647bc
|
739 740 |
ip_rt_put(rt); goto tx_error; |
c54419321
|
741 |
} |
c54419321
|
742 743 744 745 746 747 748 749 750 751 |
if (tunnel->err_count > 0) { if (time_before(jiffies, tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { tunnel->err_count--; dst_link_failure(skb); } else tunnel->err_count = 0; } |
d4a71b155
|
752 |
tos = ip_tunnel_ecn_encap(tos, inner_iph, skb); |
c54419321
|
753 754 755 756 757 758 759 760 761 762 763 |
ttl = tnl_params->ttl; if (ttl == 0) { if (skb->protocol == htons(ETH_P_IP)) ttl = inner_iph->ttl; #if IS_ENABLED(CONFIG_IPV6) else if (skb->protocol == htons(ETH_P_IPV6)) ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit; #endif else ttl = ip4_dst_hoplimit(&rt->dst); } |
23a3647bc
|
764 |
df = tnl_params->frag_off; |
22a59be8b
|
765 |
if (skb->protocol == htons(ETH_P_IP) && !tunnel->ignore_df) |
23a3647bc
|
766 |
df |= (inner_iph->frag_off&htons(IP_DF)); |
0e6fbc5b6
|
767 |
max_headroom = LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) |
7371e0221
|
768 |
+ rt->dst.header_len + ip_encap_hlen(&tunnel->encap); |
3e08f4a72
|
769 |
if (max_headroom > dev->needed_headroom) |
c54419321
|
770 |
dev->needed_headroom = max_headroom; |
3e08f4a72
|
771 772 |
if (skb_cow_head(skb, dev->needed_headroom)) { |
586d5fc86
|
773 |
ip_rt_put(rt); |
3e08f4a72
|
774 |
dev->stats.tx_dropped++; |
3acfa1e73
|
775 |
kfree_skb(skb); |
3e08f4a72
|
776 |
return; |
c54419321
|
777 |
} |
039f50629
|
778 779 |
iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, df, !net_eq(tunnel->net, dev_net(dev))); |
c54419321
|
780 781 782 783 784 785 786 787 |
return; #if IS_ENABLED(CONFIG_IPV6) tx_error_icmp: dst_link_failure(skb); #endif tx_error: dev->stats.tx_errors++; |
3acfa1e73
|
788 |
kfree_skb(skb); |
c54419321
|
789 790 791 792 793 794 795 |
} EXPORT_SYMBOL_GPL(ip_tunnel_xmit); static void ip_tunnel_update(struct ip_tunnel_net *itn, struct ip_tunnel *t, struct net_device *dev, struct ip_tunnel_parm *p, |
9830ad4c6
|
796 797 |
bool set_mtu, __u32 fwmark) |
c54419321
|
798 |
{ |
2e15ea390
|
799 |
ip_tunnel_del(itn, t); |
c54419321
|
800 801 802 803 804 805 806 807 808 809 810 811 812 |
t->parms.iph.saddr = p->iph.saddr; t->parms.iph.daddr = p->iph.daddr; t->parms.i_key = p->i_key; t->parms.o_key = p->o_key; if (dev->type != ARPHRD_ETHER) { memcpy(dev->dev_addr, &p->iph.saddr, 4); memcpy(dev->broadcast, &p->iph.daddr, 4); } ip_tunnel_add(itn, t); t->parms.iph.ttl = p->iph.ttl; t->parms.iph.tos = p->iph.tos; t->parms.iph.frag_off = p->iph.frag_off; |
9830ad4c6
|
813 |
if (t->parms.link != p->link || t->fwmark != fwmark) { |
c54419321
|
814 815 816 |
int mtu; t->parms.link = p->link; |
9830ad4c6
|
817 |
t->fwmark = fwmark; |
c54419321
|
818 819 820 821 |
mtu = ip_tunnel_bind_dev(dev); if (set_mtu) dev->mtu = mtu; } |
e09acddf8
|
822 |
dst_cache_reset(&t->dst_cache); |
c54419321
|
823 824 825 826 827 828 |
netdev_state_change(dev); } int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) { int err = 0; |
8c923ce21
|
829 830 831 |
struct ip_tunnel *t = netdev_priv(dev); struct net *net = t->net; struct ip_tunnel_net *itn = net_generic(net, t->ip_tnl_net_id); |
c54419321
|
832 |
|
c54419321
|
833 834 |
switch (cmd) { case SIOCGETTUNNEL: |
8c923ce21
|
835 |
if (dev == itn->fb_tunnel_dev) { |
c54419321
|
836 |
t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b291
|
837 |
if (!t) |
8c923ce21
|
838 839 |
t = netdev_priv(dev); } |
c54419321
|
840 841 842 843 844 845 846 847 848 849 |
memcpy(p, &t->parms, sizeof(*p)); break; case SIOCADDTUNNEL: case SIOCCHGTUNNEL: err = -EPERM; if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) goto done; if (p->iph.ttl) p->iph.frag_off |= htons(IP_DF); |
7c8e6b9c2
|
850 851 852 853 854 855 |
if (!(p->i_flags & VTI_ISVTI)) { if (!(p->i_flags & TUNNEL_KEY)) p->i_key = 0; if (!(p->o_flags & TUNNEL_KEY)) p->o_key = 0; } |
c54419321
|
856 |
|
79134e6ce
|
857 |
t = ip_tunnel_find(itn, p, itn->type); |
c54419321
|
858 |
|
d61746b2e
|
859 860 861 862 863 864 865 866 |
if (cmd == SIOCADDTUNNEL) { if (!t) { t = ip_tunnel_create(net, itn, p); err = PTR_ERR_OR_ZERO(t); break; } err = -EEXIST; |
ee30ef4d4
|
867 |
break; |
6dd3c9ec2
|
868 |
} |
c54419321
|
869 |
if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
00db41243
|
870 |
if (t) { |
c54419321
|
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 |
if (t->dev != dev) { err = -EEXIST; break; } } else { unsigned int nflags = 0; if (ipv4_is_multicast(p->iph.daddr)) nflags = IFF_BROADCAST; else if (p->iph.daddr) nflags = IFF_POINTOPOINT; if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { err = -EINVAL; break; } t = netdev_priv(dev); } } if (t) { err = 0; |
9830ad4c6
|
894 |
ip_tunnel_update(itn, t, dev, p, true, 0); |
6dd3c9ec2
|
895 896 897 |
} else { err = -ENOENT; } |
c54419321
|
898 899 900 901 902 903 904 905 906 907 |
break; case SIOCDELTUNNEL: err = -EPERM; if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) goto done; if (dev == itn->fb_tunnel_dev) { err = -ENOENT; t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type); |
51456b291
|
908 |
if (!t) |
c54419321
|
909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 |
goto done; err = -EPERM; if (t == netdev_priv(itn->fb_tunnel_dev)) goto done; dev = t->dev; } unregister_netdevice(dev); err = 0; break; default: err = -EINVAL; } done: return err; } EXPORT_SYMBOL_GPL(ip_tunnel_ioctl); |
7e059158d
|
927 |
int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict) |
c54419321
|
928 929 930 |
{ struct ip_tunnel *tunnel = netdev_priv(dev); int t_hlen = tunnel->hlen + sizeof(struct iphdr); |
82612de1c
|
931 |
int max_mtu = IP_MAX_MTU - dev->hard_header_len - t_hlen; |
c54419321
|
932 |
|
b96f9afee
|
933 |
if (new_mtu < ETH_MIN_MTU) |
c54419321
|
934 |
return -EINVAL; |
7e059158d
|
935 936 937 938 939 940 941 |
if (new_mtu > max_mtu) { if (strict) return -EINVAL; new_mtu = max_mtu; } |
c54419321
|
942 943 944 |
dev->mtu = new_mtu; return 0; } |
7e059158d
|
945 946 947 948 949 950 |
EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu); int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu) { return __ip_tunnel_change_mtu(dev, new_mtu, true); } |
c54419321
|
951 952 953 954 955 956 957 |
EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu); static void ip_tunnel_dev_free(struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); gro_cells_destroy(&tunnel->gro_cells); |
e09acddf8
|
958 |
dst_cache_destroy(&tunnel->dst_cache); |
c54419321
|
959 |
free_percpu(dev->tstats); |
c54419321
|
960 961 962 963 |
} void ip_tunnel_dellink(struct net_device *dev, struct list_head *head) { |
c54419321
|
964 965 |
struct ip_tunnel *tunnel = netdev_priv(dev); struct ip_tunnel_net *itn; |
6c742e714
|
966 |
itn = net_generic(tunnel->net, tunnel->ip_tnl_net_id); |
c54419321
|
967 968 |
if (itn->fb_tunnel_dev != dev) { |
2e15ea390
|
969 |
ip_tunnel_del(itn, netdev_priv(dev)); |
c54419321
|
970 971 972 973 |
unregister_netdevice_queue(dev, head); } } EXPORT_SYMBOL_GPL(ip_tunnel_dellink); |
1728d4fab
|
974 975 976 977 978 979 980 |
struct net *ip_tunnel_get_link_net(const struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); return tunnel->net; } EXPORT_SYMBOL(ip_tunnel_get_link_net); |
1e99584b9
|
981 982 983 984 985 986 987 |
int ip_tunnel_get_iflink(const struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); return tunnel->parms.link; } EXPORT_SYMBOL(ip_tunnel_get_iflink); |
c7d03a00b
|
988 |
int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
c54419321
|
989 990 991 992 |
struct rtnl_link_ops *ops, char *devname) { struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id); struct ip_tunnel_parm parms; |
6261d983f
|
993 |
unsigned int i; |
c54419321
|
994 |
|
79134e6ce
|
995 |
itn->rtnl_link_ops = ops; |
6261d983f
|
996 997 |
for (i = 0; i < IP_TNL_HASH_SIZE; i++) INIT_HLIST_HEAD(&itn->tunnels[i]); |
c54419321
|
998 |
|
79134e6ce
|
999 1000 1001 1002 1003 |
if (!ops || !net_has_fallback_tunnels(net)) { struct ip_tunnel_net *it_init_net; it_init_net = net_generic(&init_net, ip_tnl_net_id); itn->type = it_init_net->type; |
c54419321
|
1004 1005 1006 |
itn->fb_tunnel_dev = NULL; return 0; } |
6261d983f
|
1007 |
|
c54419321
|
1008 1009 1010 1011 1012 1013 |
memset(&parms, 0, sizeof(parms)); if (devname) strlcpy(parms.name, devname, IFNAMSIZ); rtnl_lock(); itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms); |
ea857f28a
|
1014 1015 1016 |
/* FB netdevice is special: we have one, and only one per netns. * Allowing to move it to another netns is clearly unsafe. */ |
670132826
|
1017 |
if (!IS_ERR(itn->fb_tunnel_dev)) { |
b4de77ade
|
1018 |
itn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
78ff4be45
|
1019 |
itn->fb_tunnel_dev->mtu = ip_tunnel_bind_dev(itn->fb_tunnel_dev); |
670132826
|
1020 |
ip_tunnel_add(itn, netdev_priv(itn->fb_tunnel_dev)); |
79134e6ce
|
1021 |
itn->type = itn->fb_tunnel_dev->type; |
670132826
|
1022 |
} |
b4de77ade
|
1023 |
rtnl_unlock(); |
c54419321
|
1024 |
|
27d79f3b1
|
1025 |
return PTR_ERR_OR_ZERO(itn->fb_tunnel_dev); |
c54419321
|
1026 1027 |
} EXPORT_SYMBOL_GPL(ip_tunnel_init_net); |
79134e6ce
|
1028 1029 |
static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn, struct list_head *head, |
6c742e714
|
1030 |
struct rtnl_link_ops *ops) |
c54419321
|
1031 |
{ |
6c742e714
|
1032 |
struct net_device *dev, *aux; |
c54419321
|
1033 |
int h; |
6c742e714
|
1034 1035 1036 |
for_each_netdev_safe(net, dev, aux) if (dev->rtnl_link_ops == ops) unregister_netdevice_queue(dev, head); |
c54419321
|
1037 1038 1039 1040 1041 1042 |
for (h = 0; h < IP_TNL_HASH_SIZE; h++) { struct ip_tunnel *t; struct hlist_node *n; struct hlist_head *thead = &itn->tunnels[h]; hlist_for_each_entry_safe(t, n, thead, hash_node) |
6c742e714
|
1043 1044 1045 1046 1047 |
/* If dev is in the same netns, it has already * been added to the list by the previous loop. */ if (!net_eq(dev_net(t->dev), net)) unregister_netdevice_queue(t->dev, head); |
c54419321
|
1048 |
} |
c54419321
|
1049 |
} |
64bc17811
|
1050 1051 |
void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id, struct rtnl_link_ops *ops) |
c54419321
|
1052 |
{ |
64bc17811
|
1053 1054 |
struct ip_tunnel_net *itn; struct net *net; |
c54419321
|
1055 1056 1057 |
LIST_HEAD(list); rtnl_lock(); |
64bc17811
|
1058 1059 |
list_for_each_entry(net, net_list, exit_list) { itn = net_generic(net, id); |
79134e6ce
|
1060 |
ip_tunnel_destroy(net, itn, &list, ops); |
64bc17811
|
1061 |
} |
c54419321
|
1062 1063 |
unregister_netdevice_many(&list); rtnl_unlock(); |
c54419321
|
1064 |
} |
64bc17811
|
1065 |
EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets); |
c54419321
|
1066 1067 |
int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], |
9830ad4c6
|
1068 |
struct ip_tunnel_parm *p, __u32 fwmark) |
c54419321
|
1069 1070 1071 1072 1073 1074 1075 1076 1077 |
{ struct ip_tunnel *nt; struct net *net = dev_net(dev); struct ip_tunnel_net *itn; int mtu; int err; nt = netdev_priv(dev); itn = net_generic(net, nt->ip_tnl_net_id); |
2e15ea390
|
1078 1079 1080 1081 1082 1083 1084 |
if (nt->collect_md) { if (rtnl_dereference(itn->collect_md_tun)) return -EEXIST; } else { if (ip_tunnel_find(itn, p, dev->type)) return -EEXIST; } |
c54419321
|
1085 |
|
5e6700b3b
|
1086 |
nt->net = net; |
c54419321
|
1087 |
nt->parms = *p; |
9830ad4c6
|
1088 |
nt->fwmark = fwmark; |
c54419321
|
1089 1090 |
err = register_netdevice(dev); if (err) |
f6cc9c054
|
1091 |
goto err_register_netdevice; |
c54419321
|
1092 1093 1094 1095 1096 |
if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) eth_hw_addr_random(dev); mtu = ip_tunnel_bind_dev(dev); |
24fc79798
|
1097 |
if (tb[IFLA_MTU]) { |
82612de1c
|
1098 |
unsigned int max = IP_MAX_MTU - dev->hard_header_len - nt->hlen; |
24fc79798
|
1099 |
|
5568cdc36
|
1100 1101 |
mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU, (unsigned int)(max - sizeof(struct iphdr))); |
f6cc9c054
|
1102 |
} |
c54419321
|
1103 |
|
5568cdc36
|
1104 1105 1106 |
err = dev_set_mtu(dev, mtu); if (err) goto err_dev_set_mtu; |
c54419321
|
1107 1108 |
ip_tunnel_add(itn, nt); |
f6cc9c054
|
1109 1110 1111 1112 1113 |
return 0; err_dev_set_mtu: unregister_netdevice(dev); err_register_netdevice: |
c54419321
|
1114 1115 1116 1117 1118 |
return err; } EXPORT_SYMBOL_GPL(ip_tunnel_newlink); int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], |
9830ad4c6
|
1119 |
struct ip_tunnel_parm *p, __u32 fwmark) |
c54419321
|
1120 |
{ |
6c742e714
|
1121 |
struct ip_tunnel *t; |
c54419321
|
1122 |
struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e714
|
1123 |
struct net *net = tunnel->net; |
c54419321
|
1124 1125 1126 1127 |
struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id); if (dev == itn->fb_tunnel_dev) return -EINVAL; |
c54419321
|
1128 1129 1130 1131 1132 1133 |
t = ip_tunnel_find(itn, p, dev->type); if (t) { if (t->dev != dev) return -EEXIST; } else { |
6c742e714
|
1134 |
t = tunnel; |
c54419321
|
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 |
if (dev->type != ARPHRD_ETHER) { unsigned int nflags = 0; if (ipv4_is_multicast(p->iph.daddr)) nflags = IFF_BROADCAST; else if (p->iph.daddr) nflags = IFF_POINTOPOINT; if ((dev->flags ^ nflags) & (IFF_POINTOPOINT | IFF_BROADCAST)) return -EINVAL; } } |
9830ad4c6
|
1149 |
ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU], fwmark); |
c54419321
|
1150 1151 1152 1153 1154 1155 1156 1157 |
return 0; } EXPORT_SYMBOL_GPL(ip_tunnel_changelink); int ip_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel = netdev_priv(dev); struct iphdr *iph = &tunnel->parms.iph; |
1c213bd24
|
1158 |
int err; |
c54419321
|
1159 |
|
cf124db56
|
1160 1161 |
dev->needs_free_netdev = true; dev->priv_destructor = ip_tunnel_dev_free; |
1c213bd24
|
1162 |
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
c54419321
|
1163 1164 |
if (!dev->tstats) return -ENOMEM; |
e09acddf8
|
1165 1166 |
err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); if (err) { |
9a4aa9af4
|
1167 |
free_percpu(dev->tstats); |
e09acddf8
|
1168 |
return err; |
9a4aa9af4
|
1169 |
} |
c54419321
|
1170 1171 |
err = gro_cells_init(&tunnel->gro_cells, dev); if (err) { |
e09acddf8
|
1172 |
dst_cache_destroy(&tunnel->dst_cache); |
c54419321
|
1173 1174 1175 1176 1177 |
free_percpu(dev->tstats); return err; } tunnel->dev = dev; |
6c742e714
|
1178 |
tunnel->net = dev_net(dev); |
c54419321
|
1179 1180 1181 |
strcpy(tunnel->parms.name, dev->name); iph->version = 4; iph->ihl = 5; |
2e15ea390
|
1182 1183 1184 1185 |
if (tunnel->collect_md) { dev->features |= NETIF_F_NETNS_LOCAL; netif_keep_dst(dev); } |
c54419321
|
1186 1187 1188 1189 1190 1191 |
return 0; } EXPORT_SYMBOL_GPL(ip_tunnel_init); void ip_tunnel_uninit(struct net_device *dev) { |
c54419321
|
1192 |
struct ip_tunnel *tunnel = netdev_priv(dev); |
6c742e714
|
1193 |
struct net *net = tunnel->net; |
c54419321
|
1194 1195 1196 1197 1198 |
struct ip_tunnel_net *itn; itn = net_generic(net, tunnel->ip_tnl_net_id); /* fb_tunnel_dev will be unregisted in net-exit call. */ if (itn->fb_tunnel_dev != dev) |
2e15ea390
|
1199 |
ip_tunnel_del(itn, netdev_priv(dev)); |
7d442fab0
|
1200 |
|
e09acddf8
|
1201 |
dst_cache_reset(&tunnel->dst_cache); |
c54419321
|
1202 1203 1204 1205 |
} EXPORT_SYMBOL_GPL(ip_tunnel_uninit); /* Do least required initialization, rest of init is done in tunnel_init call */ |
c7d03a00b
|
1206 |
void ip_tunnel_setup(struct net_device *dev, unsigned int net_id) |
c54419321
|
1207 1208 1209 1210 1211 1212 1213 |
{ struct ip_tunnel *tunnel = netdev_priv(dev); tunnel->ip_tnl_net_id = net_id; } EXPORT_SYMBOL_GPL(ip_tunnel_setup); MODULE_LICENSE("GPL"); |