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2402 lines
58 KiB
2402 lines
58 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* GRE over IPv6 protocol decoder. |
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* |
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* Authors: Dmitry Kozlov ([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/capability.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <linux/skbuff.h> |
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#include <linux/netdevice.h> |
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#include <linux/in.h> |
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#include <linux/tcp.h> |
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#include <linux/udp.h> |
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#include <linux/if_arp.h> |
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#include <linux/init.h> |
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#include <linux/in6.h> |
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#include <linux/inetdevice.h> |
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#include <linux/igmp.h> |
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#include <linux/netfilter_ipv4.h> |
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#include <linux/etherdevice.h> |
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#include <linux/if_ether.h> |
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#include <linux/hash.h> |
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#include <linux/if_tunnel.h> |
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#include <linux/ip6_tunnel.h> |
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|
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#include <net/sock.h> |
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#include <net/ip.h> |
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#include <net/ip_tunnels.h> |
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#include <net/icmp.h> |
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#include <net/protocol.h> |
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#include <net/addrconf.h> |
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#include <net/arp.h> |
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#include <net/checksum.h> |
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#include <net/dsfield.h> |
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#include <net/inet_ecn.h> |
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#include <net/xfrm.h> |
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#include <net/net_namespace.h> |
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#include <net/netns/generic.h> |
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#include <net/rtnetlink.h> |
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|
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#include <net/ipv6.h> |
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#include <net/ip6_fib.h> |
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#include <net/ip6_route.h> |
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#include <net/ip6_tunnel.h> |
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#include <net/gre.h> |
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#include <net/erspan.h> |
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#include <net/dst_metadata.h> |
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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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#define IP6_GRE_HASH_SIZE_SHIFT 5 |
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#define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT) |
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|
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static unsigned int ip6gre_net_id __read_mostly; |
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struct ip6gre_net { |
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struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE]; |
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struct ip6_tnl __rcu *collect_md_tun; |
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struct ip6_tnl __rcu *collect_md_tun_erspan; |
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struct net_device *fb_tunnel_dev; |
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}; |
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static struct rtnl_link_ops ip6gre_link_ops __read_mostly; |
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static struct rtnl_link_ops ip6gre_tap_ops __read_mostly; |
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static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly; |
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static int ip6gre_tunnel_init(struct net_device *dev); |
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static void ip6gre_tunnel_setup(struct net_device *dev); |
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static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t); |
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static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu); |
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static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu); |
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|
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/* Tunnel hash table */ |
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|
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/* |
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4 hash tables: |
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|
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3: (remote,local) |
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2: (remote,*) |
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1: (*,local) |
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0: (*,*) |
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|
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We require exact key match i.e. if a key is present in packet |
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it will match only tunnel with the same key; if it is not present, |
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it will match only keyless tunnel. |
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|
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All keysless packets, if not matched configured keyless tunnels |
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will match fallback tunnel. |
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*/ |
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|
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#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1)) |
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static u32 HASH_ADDR(const struct in6_addr *addr) |
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{ |
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u32 hash = ipv6_addr_hash(addr); |
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|
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return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT); |
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} |
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|
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#define tunnels_r_l tunnels[3] |
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#define tunnels_r tunnels[2] |
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#define tunnels_l tunnels[1] |
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#define tunnels_wc tunnels[0] |
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|
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/* Given src, dst and key, find appropriate for input tunnel. */ |
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|
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static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev, |
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const struct in6_addr *remote, const struct in6_addr *local, |
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__be32 key, __be16 gre_proto) |
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{ |
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struct net *net = dev_net(dev); |
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int link = dev->ifindex; |
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unsigned int h0 = HASH_ADDR(remote); |
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unsigned int h1 = HASH_KEY(key); |
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struct ip6_tnl *t, *cand = NULL; |
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
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int dev_type = (gre_proto == htons(ETH_P_TEB) || |
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gre_proto == htons(ETH_P_ERSPAN) || |
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gre_proto == htons(ETH_P_ERSPAN2)) ? |
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ARPHRD_ETHER : ARPHRD_IP6GRE; |
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int score, cand_score = 4; |
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struct net_device *ndev; |
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|
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for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) { |
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if (!ipv6_addr_equal(local, &t->parms.laddr) || |
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!ipv6_addr_equal(remote, &t->parms.raddr) || |
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key != t->parms.i_key || |
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!(t->dev->flags & IFF_UP)) |
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continue; |
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|
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if (t->dev->type != ARPHRD_IP6GRE && |
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t->dev->type != dev_type) |
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continue; |
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|
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score = 0; |
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if (t->parms.link != link) |
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score |= 1; |
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if (t->dev->type != dev_type) |
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score |= 2; |
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if (score == 0) |
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return t; |
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|
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if (score < cand_score) { |
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cand = t; |
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cand_score = score; |
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} |
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} |
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|
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for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) { |
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if (!ipv6_addr_equal(remote, &t->parms.raddr) || |
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key != t->parms.i_key || |
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!(t->dev->flags & IFF_UP)) |
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continue; |
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|
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if (t->dev->type != ARPHRD_IP6GRE && |
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t->dev->type != dev_type) |
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continue; |
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|
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score = 0; |
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if (t->parms.link != link) |
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score |= 1; |
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if (t->dev->type != dev_type) |
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score |= 2; |
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if (score == 0) |
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return t; |
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|
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if (score < cand_score) { |
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cand = t; |
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cand_score = score; |
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} |
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} |
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|
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for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) { |
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if ((!ipv6_addr_equal(local, &t->parms.laddr) && |
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(!ipv6_addr_equal(local, &t->parms.raddr) || |
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!ipv6_addr_is_multicast(local))) || |
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key != t->parms.i_key || |
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!(t->dev->flags & IFF_UP)) |
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continue; |
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|
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if (t->dev->type != ARPHRD_IP6GRE && |
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t->dev->type != dev_type) |
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continue; |
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|
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score = 0; |
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if (t->parms.link != link) |
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score |= 1; |
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if (t->dev->type != dev_type) |
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score |= 2; |
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if (score == 0) |
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return t; |
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|
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if (score < cand_score) { |
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cand = t; |
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cand_score = score; |
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} |
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} |
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|
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for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) { |
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if (t->parms.i_key != key || |
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!(t->dev->flags & IFF_UP)) |
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continue; |
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|
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if (t->dev->type != ARPHRD_IP6GRE && |
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t->dev->type != dev_type) |
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continue; |
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|
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score = 0; |
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if (t->parms.link != link) |
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score |= 1; |
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if (t->dev->type != dev_type) |
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score |= 2; |
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if (score == 0) |
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return t; |
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|
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if (score < cand_score) { |
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cand = t; |
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cand_score = score; |
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} |
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} |
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|
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if (cand) |
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return cand; |
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|
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if (gre_proto == htons(ETH_P_ERSPAN) || |
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gre_proto == htons(ETH_P_ERSPAN2)) |
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t = rcu_dereference(ign->collect_md_tun_erspan); |
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else |
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t = rcu_dereference(ign->collect_md_tun); |
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|
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if (t && t->dev->flags & IFF_UP) |
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return t; |
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|
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ndev = READ_ONCE(ign->fb_tunnel_dev); |
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if (ndev && ndev->flags & IFF_UP) |
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return netdev_priv(ndev); |
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|
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return NULL; |
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} |
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|
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static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign, |
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const struct __ip6_tnl_parm *p) |
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{ |
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const struct in6_addr *remote = &p->raddr; |
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const struct in6_addr *local = &p->laddr; |
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unsigned int h = HASH_KEY(p->i_key); |
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int prio = 0; |
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|
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if (!ipv6_addr_any(local)) |
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prio |= 1; |
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if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) { |
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prio |= 2; |
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h ^= HASH_ADDR(remote); |
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} |
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|
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return &ign->tunnels[prio][h]; |
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} |
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|
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static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) |
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{ |
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if (t->parms.collect_md) |
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rcu_assign_pointer(ign->collect_md_tun, t); |
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} |
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|
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static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t) |
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{ |
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if (t->parms.collect_md) |
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rcu_assign_pointer(ign->collect_md_tun_erspan, t); |
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} |
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|
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static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t) |
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{ |
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if (t->parms.collect_md) |
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rcu_assign_pointer(ign->collect_md_tun, NULL); |
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} |
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|
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static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign, |
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struct ip6_tnl *t) |
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{ |
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if (t->parms.collect_md) |
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rcu_assign_pointer(ign->collect_md_tun_erspan, NULL); |
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} |
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|
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static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign, |
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const struct ip6_tnl *t) |
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{ |
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return __ip6gre_bucket(ign, &t->parms); |
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} |
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static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t) |
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{ |
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struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t); |
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|
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rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
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rcu_assign_pointer(*tp, t); |
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} |
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|
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static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t) |
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{ |
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struct ip6_tnl __rcu **tp; |
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struct ip6_tnl *iter; |
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|
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for (tp = ip6gre_bucket(ign, t); |
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(iter = rtnl_dereference(*tp)) != NULL; |
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tp = &iter->next) { |
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if (t == iter) { |
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rcu_assign_pointer(*tp, t->next); |
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break; |
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} |
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} |
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} |
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|
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static struct ip6_tnl *ip6gre_tunnel_find(struct net *net, |
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const struct __ip6_tnl_parm *parms, |
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int type) |
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{ |
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const struct in6_addr *remote = &parms->raddr; |
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const struct in6_addr *local = &parms->laddr; |
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__be32 key = parms->i_key; |
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int link = parms->link; |
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struct ip6_tnl *t; |
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struct ip6_tnl __rcu **tp; |
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
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|
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for (tp = __ip6gre_bucket(ign, parms); |
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(t = rtnl_dereference(*tp)) != NULL; |
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tp = &t->next) |
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if (ipv6_addr_equal(local, &t->parms.laddr) && |
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ipv6_addr_equal(remote, &t->parms.raddr) && |
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key == t->parms.i_key && |
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link == t->parms.link && |
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type == t->dev->type) |
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break; |
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|
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return t; |
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} |
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|
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static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net, |
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const struct __ip6_tnl_parm *parms, int create) |
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{ |
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struct ip6_tnl *t, *nt; |
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struct net_device *dev; |
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char name[IFNAMSIZ]; |
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
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|
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t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE); |
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if (t && create) |
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return NULL; |
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if (t || !create) |
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return t; |
|
|
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if (parms->name[0]) { |
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if (!dev_valid_name(parms->name)) |
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return NULL; |
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strlcpy(name, parms->name, IFNAMSIZ); |
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} else { |
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strcpy(name, "ip6gre%d"); |
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} |
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dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, |
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ip6gre_tunnel_setup); |
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if (!dev) |
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return NULL; |
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|
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dev_net_set(dev, net); |
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|
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nt = netdev_priv(dev); |
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nt->parms = *parms; |
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dev->rtnl_link_ops = &ip6gre_link_ops; |
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|
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nt->dev = dev; |
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nt->net = dev_net(dev); |
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|
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if (register_netdevice(dev) < 0) |
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goto failed_free; |
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ip6gre_tnl_link_config(nt, 1); |
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|
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/* Can use a lockless transmit, unless we generate output sequences */ |
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if (!(nt->parms.o_flags & TUNNEL_SEQ)) |
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dev->features |= NETIF_F_LLTX; |
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|
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ip6gre_tunnel_link(ign, nt); |
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return nt; |
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|
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failed_free: |
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free_netdev(dev); |
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return NULL; |
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} |
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|
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static void ip6erspan_tunnel_uninit(struct net_device *dev) |
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{ |
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struct ip6_tnl *t = netdev_priv(dev); |
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struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); |
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|
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ip6erspan_tunnel_unlink_md(ign, t); |
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ip6gre_tunnel_unlink(ign, t); |
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dst_cache_reset(&t->dst_cache); |
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dev_put_track(dev, &t->dev_tracker); |
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} |
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static void ip6gre_tunnel_uninit(struct net_device *dev) |
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{ |
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struct ip6_tnl *t = netdev_priv(dev); |
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struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); |
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|
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ip6gre_tunnel_unlink_md(ign, t); |
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ip6gre_tunnel_unlink(ign, t); |
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if (ign->fb_tunnel_dev == dev) |
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WRITE_ONCE(ign->fb_tunnel_dev, NULL); |
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dst_cache_reset(&t->dst_cache); |
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dev_put_track(dev, &t->dev_tracker); |
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} |
|
|
|
|
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static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
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u8 type, u8 code, int offset, __be32 info) |
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{ |
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struct net *net = dev_net(skb->dev); |
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const struct ipv6hdr *ipv6h; |
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struct tnl_ptk_info tpi; |
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struct ip6_tnl *t; |
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|
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if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6), |
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offset) < 0) |
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return -EINVAL; |
|
|
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ipv6h = (const struct ipv6hdr *)skb->data; |
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t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr, |
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tpi.key, tpi.proto); |
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if (!t) |
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return -ENOENT; |
|
|
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switch (type) { |
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case ICMPV6_DEST_UNREACH: |
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net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", |
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t->parms.name); |
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if (code != ICMPV6_PORT_UNREACH) |
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break; |
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return 0; |
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case ICMPV6_TIME_EXCEED: |
|
if (code == ICMPV6_EXC_HOPLIMIT) { |
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net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", |
|
t->parms.name); |
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break; |
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} |
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return 0; |
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case ICMPV6_PARAMPROB: { |
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struct ipv6_tlv_tnl_enc_lim *tel; |
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__u32 teli; |
|
|
|
teli = 0; |
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if (code == ICMPV6_HDR_FIELD) |
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teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); |
|
|
|
if (teli && teli == be32_to_cpu(info) - 2) { |
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tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
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if (tel->encap_limit == 0) { |
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net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", |
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t->parms.name); |
|
} |
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} else { |
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net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", |
|
t->parms.name); |
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} |
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return 0; |
|
} |
|
case ICMPV6_PKT_TOOBIG: |
|
ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
|
return 0; |
|
case NDISC_REDIRECT: |
|
ip6_redirect(skb, net, skb->dev->ifindex, 0, |
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sock_net_uid(net, NULL)); |
|
return 0; |
|
} |
|
|
|
if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) |
|
t->err_count++; |
|
else |
|
t->err_count = 1; |
|
t->err_time = jiffies; |
|
|
|
return 0; |
|
} |
|
|
|
static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) |
|
{ |
|
const struct ipv6hdr *ipv6h; |
|
struct ip6_tnl *tunnel; |
|
|
|
ipv6h = ipv6_hdr(skb); |
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tunnel = ip6gre_tunnel_lookup(skb->dev, |
|
&ipv6h->saddr, &ipv6h->daddr, tpi->key, |
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tpi->proto); |
|
if (tunnel) { |
|
if (tunnel->parms.collect_md) { |
|
struct metadata_dst *tun_dst; |
|
__be64 tun_id; |
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__be16 flags; |
|
|
|
flags = tpi->flags; |
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tun_id = key32_to_tunnel_id(tpi->key); |
|
|
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tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0); |
|
if (!tun_dst) |
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return PACKET_REJECT; |
|
|
|
ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
|
} else { |
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ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
|
} |
|
|
|
return PACKET_RCVD; |
|
} |
|
|
|
return PACKET_REJECT; |
|
} |
|
|
|
static int ip6erspan_rcv(struct sk_buff *skb, |
|
struct tnl_ptk_info *tpi, |
|
int gre_hdr_len) |
|
{ |
|
struct erspan_base_hdr *ershdr; |
|
const struct ipv6hdr *ipv6h; |
|
struct erspan_md2 *md2; |
|
struct ip6_tnl *tunnel; |
|
u8 ver; |
|
|
|
ipv6h = ipv6_hdr(skb); |
|
ershdr = (struct erspan_base_hdr *)skb->data; |
|
ver = ershdr->ver; |
|
|
|
tunnel = ip6gre_tunnel_lookup(skb->dev, |
|
&ipv6h->saddr, &ipv6h->daddr, tpi->key, |
|
tpi->proto); |
|
if (tunnel) { |
|
int len = erspan_hdr_len(ver); |
|
|
|
if (unlikely(!pskb_may_pull(skb, len))) |
|
return PACKET_REJECT; |
|
|
|
if (__iptunnel_pull_header(skb, len, |
|
htons(ETH_P_TEB), |
|
false, false) < 0) |
|
return PACKET_REJECT; |
|
|
|
if (tunnel->parms.collect_md) { |
|
struct erspan_metadata *pkt_md, *md; |
|
struct metadata_dst *tun_dst; |
|
struct ip_tunnel_info *info; |
|
unsigned char *gh; |
|
__be64 tun_id; |
|
__be16 flags; |
|
|
|
tpi->flags |= TUNNEL_KEY; |
|
flags = tpi->flags; |
|
tun_id = key32_to_tunnel_id(tpi->key); |
|
|
|
tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, |
|
sizeof(*md)); |
|
if (!tun_dst) |
|
return PACKET_REJECT; |
|
|
|
/* skb can be uncloned in __iptunnel_pull_header, so |
|
* old pkt_md is no longer valid and we need to reset |
|
* it |
|
*/ |
|
gh = skb_network_header(skb) + |
|
skb_network_header_len(skb); |
|
pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + |
|
sizeof(*ershdr)); |
|
info = &tun_dst->u.tun_info; |
|
md = ip_tunnel_info_opts(info); |
|
md->version = ver; |
|
md2 = &md->u.md2; |
|
memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : |
|
ERSPAN_V2_MDSIZE); |
|
info->key.tun_flags |= TUNNEL_ERSPAN_OPT; |
|
info->options_len = sizeof(*md); |
|
|
|
ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
|
|
|
} else { |
|
ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error); |
|
} |
|
|
|
return PACKET_RCVD; |
|
} |
|
|
|
return PACKET_REJECT; |
|
} |
|
|
|
static int gre_rcv(struct sk_buff *skb) |
|
{ |
|
struct tnl_ptk_info tpi; |
|
bool csum_err = false; |
|
int hdr_len; |
|
|
|
hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0); |
|
if (hdr_len < 0) |
|
goto drop; |
|
|
|
if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false)) |
|
goto drop; |
|
|
|
if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || |
|
tpi.proto == htons(ETH_P_ERSPAN2))) { |
|
if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
|
return 0; |
|
goto out; |
|
} |
|
|
|
if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD) |
|
return 0; |
|
|
|
out: |
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
|
drop: |
|
kfree_skb(skb); |
|
return 0; |
|
} |
|
|
|
static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
|
{ |
|
return iptunnel_handle_offloads(skb, |
|
csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
|
} |
|
|
|
static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb, |
|
struct net_device *dev, |
|
struct flowi6 *fl6, __u8 *dsfield, |
|
int *encap_limit) |
|
{ |
|
const struct iphdr *iph = ip_hdr(skb); |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
|
*encap_limit = t->parms.encap_limit; |
|
|
|
memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); |
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
|
*dsfield = ipv4_get_dsfield(iph); |
|
else |
|
*dsfield = ip6_tclass(t->parms.flowinfo); |
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
|
fl6->flowi6_mark = skb->mark; |
|
else |
|
fl6->flowi6_mark = t->parms.fwmark; |
|
|
|
fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
|
} |
|
|
|
static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb, |
|
struct net_device *dev, |
|
struct flowi6 *fl6, __u8 *dsfield, |
|
int *encap_limit) |
|
{ |
|
struct ipv6hdr *ipv6h; |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
__u16 offset; |
|
|
|
offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); |
|
/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ |
|
ipv6h = ipv6_hdr(skb); |
|
|
|
if (offset > 0) { |
|
struct ipv6_tlv_tnl_enc_lim *tel; |
|
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; |
|
if (tel->encap_limit == 0) { |
|
icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, |
|
ICMPV6_HDR_FIELD, offset + 2); |
|
return -1; |
|
} |
|
*encap_limit = tel->encap_limit - 1; |
|
} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { |
|
*encap_limit = t->parms.encap_limit; |
|
} |
|
|
|
memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6)); |
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
|
*dsfield = ipv6_get_dsfield(ipv6h); |
|
else |
|
*dsfield = ip6_tclass(t->parms.flowinfo); |
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
|
fl6->flowlabel |= ip6_flowlabel(ipv6h); |
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
|
fl6->flowi6_mark = skb->mark; |
|
else |
|
fl6->flowi6_mark = t->parms.fwmark; |
|
|
|
fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
|
|
|
return 0; |
|
} |
|
|
|
static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb) |
|
{ |
|
struct ip_tunnel_info *tun_info; |
|
|
|
tun_info = skb_tunnel_info(skb); |
|
if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))) |
|
return ERR_PTR(-EINVAL); |
|
|
|
return tun_info; |
|
} |
|
|
|
static netdev_tx_t __gre6_xmit(struct sk_buff *skb, |
|
struct net_device *dev, __u8 dsfield, |
|
struct flowi6 *fl6, int encap_limit, |
|
__u32 *pmtu, __be16 proto) |
|
{ |
|
struct ip6_tnl *tunnel = netdev_priv(dev); |
|
__be16 protocol; |
|
|
|
if (dev->type == ARPHRD_ETHER) |
|
IPCB(skb)->flags = 0; |
|
|
|
if (dev->header_ops && dev->type == ARPHRD_IP6GRE) |
|
fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr; |
|
else |
|
fl6->daddr = tunnel->parms.raddr; |
|
|
|
if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen)) |
|
return -ENOMEM; |
|
|
|
/* Push GRE header. */ |
|
protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; |
|
|
|
if (tunnel->parms.collect_md) { |
|
struct ip_tunnel_info *tun_info; |
|
const struct ip_tunnel_key *key; |
|
__be16 flags; |
|
|
|
tun_info = skb_tunnel_info_txcheck(skb); |
|
if (IS_ERR(tun_info) || |
|
unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) |
|
return -EINVAL; |
|
|
|
key = &tun_info->key; |
|
memset(fl6, 0, sizeof(*fl6)); |
|
fl6->flowi6_proto = IPPROTO_GRE; |
|
fl6->daddr = key->u.ipv6.dst; |
|
fl6->flowlabel = key->label; |
|
fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
|
fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id); |
|
|
|
dsfield = key->tos; |
|
flags = key->tun_flags & |
|
(TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); |
|
tunnel->tun_hlen = gre_calc_hlen(flags); |
|
|
|
gre_build_header(skb, tunnel->tun_hlen, |
|
flags, protocol, |
|
tunnel_id_to_key32(tun_info->key.tun_id), |
|
(flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) |
|
: 0); |
|
|
|
} else { |
|
if (tunnel->parms.o_flags & TUNNEL_SEQ) |
|
tunnel->o_seqno++; |
|
|
|
gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, |
|
protocol, tunnel->parms.o_key, |
|
htonl(tunnel->o_seqno)); |
|
} |
|
|
|
return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, |
|
NEXTHDR_GRE); |
|
} |
|
|
|
static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
int encap_limit = -1; |
|
struct flowi6 fl6; |
|
__u8 dsfield = 0; |
|
__u32 mtu; |
|
int err; |
|
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
|
|
|
if (!t->parms.collect_md) |
|
prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, |
|
&dsfield, &encap_limit); |
|
|
|
err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); |
|
if (err) |
|
return -1; |
|
|
|
err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
|
skb->protocol); |
|
if (err != 0) { |
|
/* XXX: send ICMP error even if DF is not set. */ |
|
if (err == -EMSGSIZE) |
|
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
|
htonl(mtu)); |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb); |
|
int encap_limit = -1; |
|
struct flowi6 fl6; |
|
__u8 dsfield = 0; |
|
__u32 mtu; |
|
int err; |
|
|
|
if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr)) |
|
return -1; |
|
|
|
if (!t->parms.collect_md && |
|
prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit)) |
|
return -1; |
|
|
|
if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM))) |
|
return -1; |
|
|
|
err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, |
|
&mtu, skb->protocol); |
|
if (err != 0) { |
|
if (err == -EMSGSIZE) |
|
icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own |
|
* @t: the outgoing tunnel device |
|
* @hdr: IPv6 header from the incoming packet |
|
* |
|
* Description: |
|
* Avoid trivial tunneling loop by checking that tunnel exit-point |
|
* doesn't match source of incoming packet. |
|
* |
|
* Return: |
|
* 1 if conflict, |
|
* 0 else |
|
**/ |
|
|
|
static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t, |
|
const struct ipv6hdr *hdr) |
|
{ |
|
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); |
|
} |
|
|
|
static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
int encap_limit = -1; |
|
struct flowi6 fl6; |
|
__u32 mtu; |
|
int err; |
|
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
|
encap_limit = t->parms.encap_limit; |
|
|
|
if (!t->parms.collect_md) |
|
memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
|
|
|
err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)); |
|
if (err) |
|
return err; |
|
|
|
err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol); |
|
|
|
return err; |
|
} |
|
|
|
static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct net_device_stats *stats = &t->dev->stats; |
|
int ret; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
goto tx_err; |
|
|
|
if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) |
|
goto tx_err; |
|
|
|
switch (skb->protocol) { |
|
case htons(ETH_P_IP): |
|
ret = ip6gre_xmit_ipv4(skb, dev); |
|
break; |
|
case htons(ETH_P_IPV6): |
|
ret = ip6gre_xmit_ipv6(skb, dev); |
|
break; |
|
default: |
|
ret = ip6gre_xmit_other(skb, dev); |
|
break; |
|
} |
|
|
|
if (ret < 0) |
|
goto tx_err; |
|
|
|
return NETDEV_TX_OK; |
|
|
|
tx_err: |
|
if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb))) |
|
stats->tx_errors++; |
|
stats->tx_dropped++; |
|
kfree_skb(skb); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct ip_tunnel_info *tun_info = NULL; |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct dst_entry *dst = skb_dst(skb); |
|
struct net_device_stats *stats; |
|
bool truncate = false; |
|
int encap_limit = -1; |
|
__u8 dsfield = false; |
|
struct flowi6 fl6; |
|
int err = -EINVAL; |
|
__be16 proto; |
|
__u32 mtu; |
|
int nhoff; |
|
int thoff; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
goto tx_err; |
|
|
|
if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr)) |
|
goto tx_err; |
|
|
|
if (gre_handle_offloads(skb, false)) |
|
goto tx_err; |
|
|
|
if (skb->len > dev->mtu + dev->hard_header_len) { |
|
pskb_trim(skb, dev->mtu + dev->hard_header_len); |
|
truncate = true; |
|
} |
|
|
|
nhoff = skb_network_header(skb) - skb_mac_header(skb); |
|
if (skb->protocol == htons(ETH_P_IP) && |
|
(ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) |
|
truncate = true; |
|
|
|
thoff = skb_transport_header(skb) - skb_mac_header(skb); |
|
if (skb->protocol == htons(ETH_P_IPV6) && |
|
(ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) |
|
truncate = true; |
|
|
|
if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen)) |
|
goto tx_err; |
|
|
|
t->parms.o_flags &= ~TUNNEL_KEY; |
|
IPCB(skb)->flags = 0; |
|
|
|
/* For collect_md mode, derive fl6 from the tunnel key, |
|
* for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}. |
|
*/ |
|
if (t->parms.collect_md) { |
|
const struct ip_tunnel_key *key; |
|
struct erspan_metadata *md; |
|
__be32 tun_id; |
|
|
|
tun_info = skb_tunnel_info_txcheck(skb); |
|
if (IS_ERR(tun_info) || |
|
unlikely(ip_tunnel_info_af(tun_info) != AF_INET6)) |
|
goto tx_err; |
|
|
|
key = &tun_info->key; |
|
memset(&fl6, 0, sizeof(fl6)); |
|
fl6.flowi6_proto = IPPROTO_GRE; |
|
fl6.daddr = key->u.ipv6.dst; |
|
fl6.flowlabel = key->label; |
|
fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
|
fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id); |
|
|
|
dsfield = key->tos; |
|
if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) |
|
goto tx_err; |
|
if (tun_info->options_len < sizeof(*md)) |
|
goto tx_err; |
|
md = ip_tunnel_info_opts(tun_info); |
|
|
|
tun_id = tunnel_id_to_key32(key->tun_id); |
|
if (md->version == 1) { |
|
erspan_build_header(skb, |
|
ntohl(tun_id), |
|
ntohl(md->u.index), truncate, |
|
false); |
|
} else if (md->version == 2) { |
|
erspan_build_header_v2(skb, |
|
ntohl(tun_id), |
|
md->u.md2.dir, |
|
get_hwid(&md->u.md2), |
|
truncate, false); |
|
} else { |
|
goto tx_err; |
|
} |
|
} else { |
|
switch (skb->protocol) { |
|
case htons(ETH_P_IP): |
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
|
prepare_ip6gre_xmit_ipv4(skb, dev, &fl6, |
|
&dsfield, &encap_limit); |
|
break; |
|
case htons(ETH_P_IPV6): |
|
if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr)) |
|
goto tx_err; |
|
if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, |
|
&dsfield, &encap_limit)) |
|
goto tx_err; |
|
break; |
|
default: |
|
memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
|
break; |
|
} |
|
|
|
if (t->parms.erspan_ver == 1) |
|
erspan_build_header(skb, ntohl(t->parms.o_key), |
|
t->parms.index, |
|
truncate, false); |
|
else if (t->parms.erspan_ver == 2) |
|
erspan_build_header_v2(skb, ntohl(t->parms.o_key), |
|
t->parms.dir, |
|
t->parms.hwid, |
|
truncate, false); |
|
else |
|
goto tx_err; |
|
|
|
fl6.daddr = t->parms.raddr; |
|
} |
|
|
|
/* Push GRE header. */ |
|
proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN) |
|
: htons(ETH_P_ERSPAN2); |
|
gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++)); |
|
|
|
/* TooBig packet may have updated dst->dev's mtu */ |
|
if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu) |
|
dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false); |
|
|
|
err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
|
NEXTHDR_GRE); |
|
if (err != 0) { |
|
/* XXX: send ICMP error even if DF is not set. */ |
|
if (err == -EMSGSIZE) { |
|
if (skb->protocol == htons(ETH_P_IP)) |
|
icmp_ndo_send(skb, ICMP_DEST_UNREACH, |
|
ICMP_FRAG_NEEDED, htonl(mtu)); |
|
else |
|
icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
|
} |
|
|
|
goto tx_err; |
|
} |
|
return NETDEV_TX_OK; |
|
|
|
tx_err: |
|
stats = &t->dev->stats; |
|
if (!IS_ERR(tun_info)) |
|
stats->tx_errors++; |
|
stats->tx_dropped++; |
|
kfree_skb(skb); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static void ip6gre_tnl_link_config_common(struct ip6_tnl *t) |
|
{ |
|
struct net_device *dev = t->dev; |
|
struct __ip6_tnl_parm *p = &t->parms; |
|
struct flowi6 *fl6 = &t->fl.u.ip6; |
|
|
|
if (dev->type != ARPHRD_ETHER) { |
|
__dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr)); |
|
memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); |
|
} |
|
|
|
/* Set up flowi template */ |
|
fl6->saddr = p->laddr; |
|
fl6->daddr = p->raddr; |
|
fl6->flowi6_oif = p->link; |
|
fl6->flowlabel = 0; |
|
fl6->flowi6_proto = IPPROTO_GRE; |
|
fl6->fl6_gre_key = t->parms.o_key; |
|
|
|
if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) |
|
fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; |
|
if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
|
fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; |
|
|
|
p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); |
|
p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); |
|
|
|
if (p->flags&IP6_TNL_F_CAP_XMIT && |
|
p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER) |
|
dev->flags |= IFF_POINTOPOINT; |
|
else |
|
dev->flags &= ~IFF_POINTOPOINT; |
|
} |
|
|
|
static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu, |
|
int t_hlen) |
|
{ |
|
const struct __ip6_tnl_parm *p = &t->parms; |
|
struct net_device *dev = t->dev; |
|
|
|
if (p->flags & IP6_TNL_F_CAP_XMIT) { |
|
int strict = (ipv6_addr_type(&p->raddr) & |
|
(IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); |
|
|
|
struct rt6_info *rt = rt6_lookup(t->net, |
|
&p->raddr, &p->laddr, |
|
p->link, NULL, strict); |
|
|
|
if (!rt) |
|
return; |
|
|
|
if (rt->dst.dev) { |
|
unsigned short dst_len = rt->dst.dev->hard_header_len + |
|
t_hlen; |
|
|
|
if (t->dev->header_ops) |
|
dev->hard_header_len = dst_len; |
|
else |
|
dev->needed_headroom = dst_len; |
|
|
|
if (set_mtu) { |
|
dev->mtu = rt->dst.dev->mtu - t_hlen; |
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
|
dev->mtu -= 8; |
|
if (dev->type == ARPHRD_ETHER) |
|
dev->mtu -= ETH_HLEN; |
|
|
|
if (dev->mtu < IPV6_MIN_MTU) |
|
dev->mtu = IPV6_MIN_MTU; |
|
} |
|
} |
|
ip6_rt_put(rt); |
|
} |
|
} |
|
|
|
static int ip6gre_calc_hlen(struct ip6_tnl *tunnel) |
|
{ |
|
int t_hlen; |
|
|
|
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
|
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
|
|
|
t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); |
|
|
|
if (tunnel->dev->header_ops) |
|
tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen; |
|
else |
|
tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; |
|
|
|
return t_hlen; |
|
} |
|
|
|
static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu) |
|
{ |
|
ip6gre_tnl_link_config_common(t); |
|
ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t)); |
|
} |
|
|
|
static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t, |
|
const struct __ip6_tnl_parm *p) |
|
{ |
|
t->parms.laddr = p->laddr; |
|
t->parms.raddr = p->raddr; |
|
t->parms.flags = p->flags; |
|
t->parms.hop_limit = p->hop_limit; |
|
t->parms.encap_limit = p->encap_limit; |
|
t->parms.flowinfo = p->flowinfo; |
|
t->parms.link = p->link; |
|
t->parms.proto = p->proto; |
|
t->parms.i_key = p->i_key; |
|
t->parms.o_key = p->o_key; |
|
t->parms.i_flags = p->i_flags; |
|
t->parms.o_flags = p->o_flags; |
|
t->parms.fwmark = p->fwmark; |
|
t->parms.erspan_ver = p->erspan_ver; |
|
t->parms.index = p->index; |
|
t->parms.dir = p->dir; |
|
t->parms.hwid = p->hwid; |
|
dst_cache_reset(&t->dst_cache); |
|
} |
|
|
|
static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p, |
|
int set_mtu) |
|
{ |
|
ip6gre_tnl_copy_tnl_parm(t, p); |
|
ip6gre_tnl_link_config(t, set_mtu); |
|
return 0; |
|
} |
|
|
|
static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p, |
|
const struct ip6_tnl_parm2 *u) |
|
{ |
|
p->laddr = u->laddr; |
|
p->raddr = u->raddr; |
|
p->flags = u->flags; |
|
p->hop_limit = u->hop_limit; |
|
p->encap_limit = u->encap_limit; |
|
p->flowinfo = u->flowinfo; |
|
p->link = u->link; |
|
p->i_key = u->i_key; |
|
p->o_key = u->o_key; |
|
p->i_flags = gre_flags_to_tnl_flags(u->i_flags); |
|
p->o_flags = gre_flags_to_tnl_flags(u->o_flags); |
|
memcpy(p->name, u->name, sizeof(u->name)); |
|
} |
|
|
|
static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u, |
|
const struct __ip6_tnl_parm *p) |
|
{ |
|
u->proto = IPPROTO_GRE; |
|
u->laddr = p->laddr; |
|
u->raddr = p->raddr; |
|
u->flags = p->flags; |
|
u->hop_limit = p->hop_limit; |
|
u->encap_limit = p->encap_limit; |
|
u->flowinfo = p->flowinfo; |
|
u->link = p->link; |
|
u->i_key = p->i_key; |
|
u->o_key = p->o_key; |
|
u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); |
|
u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); |
|
memcpy(u->name, p->name, sizeof(u->name)); |
|
} |
|
|
|
static int ip6gre_tunnel_siocdevprivate(struct net_device *dev, |
|
struct ifreq *ifr, void __user *data, |
|
int cmd) |
|
{ |
|
int err = 0; |
|
struct ip6_tnl_parm2 p; |
|
struct __ip6_tnl_parm p1; |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct net *net = t->net; |
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
|
|
|
memset(&p1, 0, sizeof(p1)); |
|
|
|
switch (cmd) { |
|
case SIOCGETTUNNEL: |
|
if (dev == ign->fb_tunnel_dev) { |
|
if (copy_from_user(&p, data, sizeof(p))) { |
|
err = -EFAULT; |
|
break; |
|
} |
|
ip6gre_tnl_parm_from_user(&p1, &p); |
|
t = ip6gre_tunnel_locate(net, &p1, 0); |
|
if (!t) |
|
t = netdev_priv(dev); |
|
} |
|
memset(&p, 0, sizeof(p)); |
|
ip6gre_tnl_parm_to_user(&p, &t->parms); |
|
if (copy_to_user(data, &p, sizeof(p))) |
|
err = -EFAULT; |
|
break; |
|
|
|
case SIOCADDTUNNEL: |
|
case SIOCCHGTUNNEL: |
|
err = -EPERM; |
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
|
goto done; |
|
|
|
err = -EFAULT; |
|
if (copy_from_user(&p, data, sizeof(p))) |
|
goto done; |
|
|
|
err = -EINVAL; |
|
if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)) |
|
goto done; |
|
|
|
if (!(p.i_flags&GRE_KEY)) |
|
p.i_key = 0; |
|
if (!(p.o_flags&GRE_KEY)) |
|
p.o_key = 0; |
|
|
|
ip6gre_tnl_parm_from_user(&p1, &p); |
|
t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL); |
|
|
|
if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
|
if (t) { |
|
if (t->dev != dev) { |
|
err = -EEXIST; |
|
break; |
|
} |
|
} else { |
|
t = netdev_priv(dev); |
|
|
|
ip6gre_tunnel_unlink(ign, t); |
|
synchronize_net(); |
|
ip6gre_tnl_change(t, &p1, 1); |
|
ip6gre_tunnel_link(ign, t); |
|
netdev_state_change(dev); |
|
} |
|
} |
|
|
|
if (t) { |
|
err = 0; |
|
|
|
memset(&p, 0, sizeof(p)); |
|
ip6gre_tnl_parm_to_user(&p, &t->parms); |
|
if (copy_to_user(data, &p, sizeof(p))) |
|
err = -EFAULT; |
|
} else |
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); |
|
break; |
|
|
|
case SIOCDELTUNNEL: |
|
err = -EPERM; |
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
|
goto done; |
|
|
|
if (dev == ign->fb_tunnel_dev) { |
|
err = -EFAULT; |
|
if (copy_from_user(&p, data, sizeof(p))) |
|
goto done; |
|
err = -ENOENT; |
|
ip6gre_tnl_parm_from_user(&p1, &p); |
|
t = ip6gre_tunnel_locate(net, &p1, 0); |
|
if (!t) |
|
goto done; |
|
err = -EPERM; |
|
if (t == netdev_priv(ign->fb_tunnel_dev)) |
|
goto done; |
|
dev = t->dev; |
|
} |
|
unregister_netdevice(dev); |
|
err = 0; |
|
break; |
|
|
|
default: |
|
err = -EINVAL; |
|
} |
|
|
|
done: |
|
return err; |
|
} |
|
|
|
static int ip6gre_header(struct sk_buff *skb, struct net_device *dev, |
|
unsigned short type, const void *daddr, |
|
const void *saddr, unsigned int len) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct ipv6hdr *ipv6h; |
|
__be16 *p; |
|
|
|
ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h)); |
|
ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb, |
|
t->fl.u.ip6.flowlabel, |
|
true, &t->fl.u.ip6)); |
|
ipv6h->hop_limit = t->parms.hop_limit; |
|
ipv6h->nexthdr = NEXTHDR_GRE; |
|
ipv6h->saddr = t->parms.laddr; |
|
ipv6h->daddr = t->parms.raddr; |
|
|
|
p = (__be16 *)(ipv6h + 1); |
|
p[0] = t->parms.o_flags; |
|
p[1] = htons(type); |
|
|
|
/* |
|
* Set the source hardware address. |
|
*/ |
|
|
|
if (saddr) |
|
memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr)); |
|
if (daddr) |
|
memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr)); |
|
if (!ipv6_addr_any(&ipv6h->daddr)) |
|
return t->hlen; |
|
|
|
return -t->hlen; |
|
} |
|
|
|
static const struct header_ops ip6gre_header_ops = { |
|
.create = ip6gre_header, |
|
}; |
|
|
|
static const struct net_device_ops ip6gre_netdev_ops = { |
|
.ndo_init = ip6gre_tunnel_init, |
|
.ndo_uninit = ip6gre_tunnel_uninit, |
|
.ndo_start_xmit = ip6gre_tunnel_xmit, |
|
.ndo_siocdevprivate = ip6gre_tunnel_siocdevprivate, |
|
.ndo_change_mtu = ip6_tnl_change_mtu, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
.ndo_get_iflink = ip6_tnl_get_iflink, |
|
}; |
|
|
|
static void ip6gre_dev_free(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
|
|
gro_cells_destroy(&t->gro_cells); |
|
dst_cache_destroy(&t->dst_cache); |
|
free_percpu(dev->tstats); |
|
} |
|
|
|
static void ip6gre_tunnel_setup(struct net_device *dev) |
|
{ |
|
dev->netdev_ops = &ip6gre_netdev_ops; |
|
dev->needs_free_netdev = true; |
|
dev->priv_destructor = ip6gre_dev_free; |
|
|
|
dev->type = ARPHRD_IP6GRE; |
|
|
|
dev->flags |= IFF_NOARP; |
|
dev->addr_len = sizeof(struct in6_addr); |
|
netif_keep_dst(dev); |
|
/* This perm addr will be used as interface identifier by IPv6 */ |
|
dev->addr_assign_type = NET_ADDR_RANDOM; |
|
eth_random_addr(dev->perm_addr); |
|
} |
|
|
|
#define GRE6_FEATURES (NETIF_F_SG | \ |
|
NETIF_F_FRAGLIST | \ |
|
NETIF_F_HIGHDMA | \ |
|
NETIF_F_HW_CSUM) |
|
|
|
static void ip6gre_tnl_init_features(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *nt = netdev_priv(dev); |
|
|
|
dev->features |= GRE6_FEATURES; |
|
dev->hw_features |= GRE6_FEATURES; |
|
|
|
if (!(nt->parms.o_flags & TUNNEL_SEQ)) { |
|
/* TCP offload with GRE SEQ is not supported, nor |
|
* can we support 2 levels of outer headers requiring |
|
* an update. |
|
*/ |
|
if (!(nt->parms.o_flags & TUNNEL_CSUM) || |
|
nt->encap.type == TUNNEL_ENCAP_NONE) { |
|
dev->features |= NETIF_F_GSO_SOFTWARE; |
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
|
} |
|
|
|
/* Can use a lockless transmit, unless we generate |
|
* output sequences |
|
*/ |
|
dev->features |= NETIF_F_LLTX; |
|
} |
|
} |
|
|
|
static int ip6gre_tunnel_init_common(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *tunnel; |
|
int ret; |
|
int t_hlen; |
|
|
|
tunnel = netdev_priv(dev); |
|
|
|
tunnel->dev = dev; |
|
tunnel->net = dev_net(dev); |
|
strcpy(tunnel->parms.name, dev->name); |
|
|
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
|
if (!dev->tstats) |
|
return -ENOMEM; |
|
|
|
ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
|
if (ret) |
|
goto cleanup_alloc_pcpu_stats; |
|
|
|
ret = gro_cells_init(&tunnel->gro_cells, dev); |
|
if (ret) |
|
goto cleanup_dst_cache_init; |
|
|
|
t_hlen = ip6gre_calc_hlen(tunnel); |
|
dev->mtu = ETH_DATA_LEN - t_hlen; |
|
if (dev->type == ARPHRD_ETHER) |
|
dev->mtu -= ETH_HLEN; |
|
if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
|
dev->mtu -= 8; |
|
|
|
if (tunnel->parms.collect_md) { |
|
netif_keep_dst(dev); |
|
} |
|
ip6gre_tnl_init_features(dev); |
|
|
|
dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL); |
|
return 0; |
|
|
|
cleanup_dst_cache_init: |
|
dst_cache_destroy(&tunnel->dst_cache); |
|
cleanup_alloc_pcpu_stats: |
|
free_percpu(dev->tstats); |
|
dev->tstats = NULL; |
|
return ret; |
|
} |
|
|
|
static int ip6gre_tunnel_init(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *tunnel; |
|
int ret; |
|
|
|
ret = ip6gre_tunnel_init_common(dev); |
|
if (ret) |
|
return ret; |
|
|
|
tunnel = netdev_priv(dev); |
|
|
|
if (tunnel->parms.collect_md) |
|
return 0; |
|
|
|
__dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr)); |
|
memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr)); |
|
|
|
if (ipv6_addr_any(&tunnel->parms.raddr)) |
|
dev->header_ops = &ip6gre_header_ops; |
|
|
|
return 0; |
|
} |
|
|
|
static void ip6gre_fb_tunnel_init(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *tunnel = netdev_priv(dev); |
|
|
|
tunnel->dev = dev; |
|
tunnel->net = dev_net(dev); |
|
strcpy(tunnel->parms.name, dev->name); |
|
|
|
tunnel->hlen = sizeof(struct ipv6hdr) + 4; |
|
} |
|
|
|
static struct inet6_protocol ip6gre_protocol __read_mostly = { |
|
.handler = gre_rcv, |
|
.err_handler = ip6gre_err, |
|
.flags = INET6_PROTO_FINAL, |
|
}; |
|
|
|
static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head) |
|
{ |
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
|
struct net_device *dev, *aux; |
|
int prio; |
|
|
|
for_each_netdev_safe(net, dev, aux) |
|
if (dev->rtnl_link_ops == &ip6gre_link_ops || |
|
dev->rtnl_link_ops == &ip6gre_tap_ops || |
|
dev->rtnl_link_ops == &ip6erspan_tap_ops) |
|
unregister_netdevice_queue(dev, head); |
|
|
|
for (prio = 0; prio < 4; prio++) { |
|
int h; |
|
for (h = 0; h < IP6_GRE_HASH_SIZE; h++) { |
|
struct ip6_tnl *t; |
|
|
|
t = rtnl_dereference(ign->tunnels[prio][h]); |
|
|
|
while (t) { |
|
/* 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); |
|
t = rtnl_dereference(t->next); |
|
} |
|
} |
|
} |
|
} |
|
|
|
static int __net_init ip6gre_init_net(struct net *net) |
|
{ |
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
|
struct net_device *ndev; |
|
int err; |
|
|
|
if (!net_has_fallback_tunnels(net)) |
|
return 0; |
|
ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0", |
|
NET_NAME_UNKNOWN, ip6gre_tunnel_setup); |
|
if (!ndev) { |
|
err = -ENOMEM; |
|
goto err_alloc_dev; |
|
} |
|
ign->fb_tunnel_dev = ndev; |
|
dev_net_set(ign->fb_tunnel_dev, net); |
|
/* FB netdevice is special: we have one, and only one per netns. |
|
* Allowing to move it to another netns is clearly unsafe. |
|
*/ |
|
ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; |
|
|
|
|
|
ip6gre_fb_tunnel_init(ign->fb_tunnel_dev); |
|
ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops; |
|
|
|
err = register_netdev(ign->fb_tunnel_dev); |
|
if (err) |
|
goto err_reg_dev; |
|
|
|
rcu_assign_pointer(ign->tunnels_wc[0], |
|
netdev_priv(ign->fb_tunnel_dev)); |
|
return 0; |
|
|
|
err_reg_dev: |
|
free_netdev(ndev); |
|
err_alloc_dev: |
|
return err; |
|
} |
|
|
|
static void __net_exit ip6gre_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) |
|
ip6gre_destroy_tunnels(net, &list); |
|
unregister_netdevice_many(&list); |
|
rtnl_unlock(); |
|
} |
|
|
|
static struct pernet_operations ip6gre_net_ops = { |
|
.init = ip6gre_init_net, |
|
.exit_batch = ip6gre_exit_batch_net, |
|
.id = &ip6gre_net_id, |
|
.size = sizeof(struct ip6gre_net), |
|
}; |
|
|
|
static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
__be16 flags; |
|
|
|
if (!data) |
|
return 0; |
|
|
|
flags = 0; |
|
if (data[IFLA_GRE_IFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
|
if (data[IFLA_GRE_OFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
|
if (flags & (GRE_VERSION|GRE_ROUTING)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct in6_addr daddr; |
|
|
|
if (tb[IFLA_ADDRESS]) { |
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
|
return -EINVAL; |
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
|
return -EADDRNOTAVAIL; |
|
} |
|
|
|
if (!data) |
|
goto out; |
|
|
|
if (data[IFLA_GRE_REMOTE]) { |
|
daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); |
|
if (ipv6_addr_any(&daddr)) |
|
return -EINVAL; |
|
} |
|
|
|
out: |
|
return ip6gre_tunnel_validate(tb, data, extack); |
|
} |
|
|
|
static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
__be16 flags = 0; |
|
int ret, ver = 0; |
|
|
|
if (!data) |
|
return 0; |
|
|
|
ret = ip6gre_tap_validate(tb, data, extack); |
|
if (ret) |
|
return ret; |
|
|
|
/* ERSPAN should only have GRE sequence and key flag */ |
|
if (data[IFLA_GRE_OFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
|
if (data[IFLA_GRE_IFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
|
if (!data[IFLA_GRE_COLLECT_METADATA] && |
|
flags != (GRE_SEQ | GRE_KEY)) |
|
return -EINVAL; |
|
|
|
/* ERSPAN Session ID only has 10-bit. Since we reuse |
|
* 32-bit key field as ID, check it's range. |
|
*/ |
|
if (data[IFLA_GRE_IKEY] && |
|
(ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) |
|
return -EINVAL; |
|
|
|
if (data[IFLA_GRE_OKEY] && |
|
(ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) |
|
return -EINVAL; |
|
|
|
if (data[IFLA_GRE_ERSPAN_VER]) { |
|
ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); |
|
if (ver != 1 && ver != 2) |
|
return -EINVAL; |
|
} |
|
|
|
if (ver == 1) { |
|
if (data[IFLA_GRE_ERSPAN_INDEX]) { |
|
u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); |
|
|
|
if (index & ~INDEX_MASK) |
|
return -EINVAL; |
|
} |
|
} else if (ver == 2) { |
|
if (data[IFLA_GRE_ERSPAN_DIR]) { |
|
u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); |
|
|
|
if (dir & ~(DIR_MASK >> DIR_OFFSET)) |
|
return -EINVAL; |
|
} |
|
|
|
if (data[IFLA_GRE_ERSPAN_HWID]) { |
|
u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); |
|
|
|
if (hwid & ~(HWID_MASK >> HWID_OFFSET)) |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void ip6erspan_set_version(struct nlattr *data[], |
|
struct __ip6_tnl_parm *parms) |
|
{ |
|
if (!data) |
|
return; |
|
|
|
parms->erspan_ver = 1; |
|
if (data[IFLA_GRE_ERSPAN_VER]) |
|
parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); |
|
|
|
if (parms->erspan_ver == 1) { |
|
if (data[IFLA_GRE_ERSPAN_INDEX]) |
|
parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); |
|
} else if (parms->erspan_ver == 2) { |
|
if (data[IFLA_GRE_ERSPAN_DIR]) |
|
parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); |
|
if (data[IFLA_GRE_ERSPAN_HWID]) |
|
parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); |
|
} |
|
} |
|
|
|
static void ip6gre_netlink_parms(struct nlattr *data[], |
|
struct __ip6_tnl_parm *parms) |
|
{ |
|
memset(parms, 0, sizeof(*parms)); |
|
|
|
if (!data) |
|
return; |
|
|
|
if (data[IFLA_GRE_LINK]) |
|
parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
|
|
|
if (data[IFLA_GRE_IFLAGS]) |
|
parms->i_flags = gre_flags_to_tnl_flags( |
|
nla_get_be16(data[IFLA_GRE_IFLAGS])); |
|
|
|
if (data[IFLA_GRE_OFLAGS]) |
|
parms->o_flags = gre_flags_to_tnl_flags( |
|
nla_get_be16(data[IFLA_GRE_OFLAGS])); |
|
|
|
if (data[IFLA_GRE_IKEY]) |
|
parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
|
|
|
if (data[IFLA_GRE_OKEY]) |
|
parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
|
|
|
if (data[IFLA_GRE_LOCAL]) |
|
parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]); |
|
|
|
if (data[IFLA_GRE_REMOTE]) |
|
parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]); |
|
|
|
if (data[IFLA_GRE_TTL]) |
|
parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]); |
|
|
|
if (data[IFLA_GRE_ENCAP_LIMIT]) |
|
parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]); |
|
|
|
if (data[IFLA_GRE_FLOWINFO]) |
|
parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]); |
|
|
|
if (data[IFLA_GRE_FLAGS]) |
|
parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); |
|
|
|
if (data[IFLA_GRE_FWMARK]) |
|
parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); |
|
|
|
if (data[IFLA_GRE_COLLECT_METADATA]) |
|
parms->collect_md = true; |
|
} |
|
|
|
static int ip6gre_tap_init(struct net_device *dev) |
|
{ |
|
int ret; |
|
|
|
ret = ip6gre_tunnel_init_common(dev); |
|
if (ret) |
|
return ret; |
|
|
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
|
|
return 0; |
|
} |
|
|
|
static const struct net_device_ops ip6gre_tap_netdev_ops = { |
|
.ndo_init = ip6gre_tap_init, |
|
.ndo_uninit = ip6gre_tunnel_uninit, |
|
.ndo_start_xmit = ip6gre_tunnel_xmit, |
|
.ndo_set_mac_address = eth_mac_addr, |
|
.ndo_validate_addr = eth_validate_addr, |
|
.ndo_change_mtu = ip6_tnl_change_mtu, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
.ndo_get_iflink = ip6_tnl_get_iflink, |
|
}; |
|
|
|
static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel) |
|
{ |
|
int t_hlen; |
|
|
|
tunnel->tun_hlen = 8; |
|
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
|
erspan_hdr_len(tunnel->parms.erspan_ver); |
|
|
|
t_hlen = tunnel->hlen + sizeof(struct ipv6hdr); |
|
tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen; |
|
return t_hlen; |
|
} |
|
|
|
static int ip6erspan_tap_init(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *tunnel; |
|
int t_hlen; |
|
int ret; |
|
|
|
tunnel = netdev_priv(dev); |
|
|
|
tunnel->dev = dev; |
|
tunnel->net = dev_net(dev); |
|
strcpy(tunnel->parms.name, dev->name); |
|
|
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
|
if (!dev->tstats) |
|
return -ENOMEM; |
|
|
|
ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); |
|
if (ret) |
|
goto cleanup_alloc_pcpu_stats; |
|
|
|
ret = gro_cells_init(&tunnel->gro_cells, dev); |
|
if (ret) |
|
goto cleanup_dst_cache_init; |
|
|
|
t_hlen = ip6erspan_calc_hlen(tunnel); |
|
dev->mtu = ETH_DATA_LEN - t_hlen; |
|
if (dev->type == ARPHRD_ETHER) |
|
dev->mtu -= ETH_HLEN; |
|
if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
|
dev->mtu -= 8; |
|
|
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
ip6erspan_tnl_link_config(tunnel, 1); |
|
|
|
dev_hold_track(dev, &tunnel->dev_tracker, GFP_KERNEL); |
|
return 0; |
|
|
|
cleanup_dst_cache_init: |
|
dst_cache_destroy(&tunnel->dst_cache); |
|
cleanup_alloc_pcpu_stats: |
|
free_percpu(dev->tstats); |
|
dev->tstats = NULL; |
|
return ret; |
|
} |
|
|
|
static const struct net_device_ops ip6erspan_netdev_ops = { |
|
.ndo_init = ip6erspan_tap_init, |
|
.ndo_uninit = ip6erspan_tunnel_uninit, |
|
.ndo_start_xmit = ip6erspan_tunnel_xmit, |
|
.ndo_set_mac_address = eth_mac_addr, |
|
.ndo_validate_addr = eth_validate_addr, |
|
.ndo_change_mtu = ip6_tnl_change_mtu, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
.ndo_get_iflink = ip6_tnl_get_iflink, |
|
}; |
|
|
|
static void ip6gre_tap_setup(struct net_device *dev) |
|
{ |
|
|
|
ether_setup(dev); |
|
|
|
dev->max_mtu = 0; |
|
dev->netdev_ops = &ip6gre_tap_netdev_ops; |
|
dev->needs_free_netdev = true; |
|
dev->priv_destructor = ip6gre_dev_free; |
|
|
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
netif_keep_dst(dev); |
|
} |
|
|
|
static bool ip6gre_netlink_encap_parms(struct nlattr *data[], |
|
struct ip_tunnel_encap *ipencap) |
|
{ |
|
bool ret = false; |
|
|
|
memset(ipencap, 0, sizeof(*ipencap)); |
|
|
|
if (!data) |
|
return ret; |
|
|
|
if (data[IFLA_GRE_ENCAP_TYPE]) { |
|
ret = true; |
|
ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); |
|
} |
|
|
|
if (data[IFLA_GRE_ENCAP_FLAGS]) { |
|
ret = true; |
|
ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); |
|
} |
|
|
|
if (data[IFLA_GRE_ENCAP_SPORT]) { |
|
ret = true; |
|
ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
|
} |
|
|
|
if (data[IFLA_GRE_ENCAP_DPORT]) { |
|
ret = true; |
|
ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip6_tnl *nt; |
|
struct ip_tunnel_encap ipencap; |
|
int err; |
|
|
|
nt = netdev_priv(dev); |
|
|
|
if (ip6gre_netlink_encap_parms(data, &ipencap)) { |
|
int err = ip6_tnl_encap_setup(nt, &ipencap); |
|
|
|
if (err < 0) |
|
return err; |
|
} |
|
|
|
if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
|
eth_hw_addr_random(dev); |
|
|
|
nt->dev = dev; |
|
nt->net = dev_net(dev); |
|
|
|
err = register_netdevice(dev); |
|
if (err) |
|
goto out; |
|
|
|
if (tb[IFLA_MTU]) |
|
ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); |
|
|
|
out: |
|
return err; |
|
} |
|
|
|
static int ip6gre_newlink(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip6_tnl *nt = netdev_priv(dev); |
|
struct net *net = dev_net(dev); |
|
struct ip6gre_net *ign; |
|
int err; |
|
|
|
ip6gre_netlink_parms(data, &nt->parms); |
|
ign = net_generic(net, ip6gre_net_id); |
|
|
|
if (nt->parms.collect_md) { |
|
if (rtnl_dereference(ign->collect_md_tun)) |
|
return -EEXIST; |
|
} else { |
|
if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) |
|
return -EEXIST; |
|
} |
|
|
|
err = ip6gre_newlink_common(src_net, dev, tb, data, extack); |
|
if (!err) { |
|
ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]); |
|
ip6gre_tunnel_link_md(ign, nt); |
|
ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); |
|
} |
|
return err; |
|
} |
|
|
|
static struct ip6_tnl * |
|
ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[], |
|
struct nlattr *data[], struct __ip6_tnl_parm *p_p, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip6_tnl *t, *nt = netdev_priv(dev); |
|
struct net *net = nt->net; |
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
|
struct ip_tunnel_encap ipencap; |
|
|
|
if (dev == ign->fb_tunnel_dev) |
|
return ERR_PTR(-EINVAL); |
|
|
|
if (ip6gre_netlink_encap_parms(data, &ipencap)) { |
|
int err = ip6_tnl_encap_setup(nt, &ipencap); |
|
|
|
if (err < 0) |
|
return ERR_PTR(err); |
|
} |
|
|
|
ip6gre_netlink_parms(data, p_p); |
|
|
|
t = ip6gre_tunnel_locate(net, p_p, 0); |
|
|
|
if (t) { |
|
if (t->dev != dev) |
|
return ERR_PTR(-EEXIST); |
|
} else { |
|
t = nt; |
|
} |
|
|
|
return t; |
|
} |
|
|
|
static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[], |
|
struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id); |
|
struct __ip6_tnl_parm p; |
|
|
|
t = ip6gre_changelink_common(dev, tb, data, &p, extack); |
|
if (IS_ERR(t)) |
|
return PTR_ERR(t); |
|
|
|
ip6gre_tunnel_unlink_md(ign, t); |
|
ip6gre_tunnel_unlink(ign, t); |
|
ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]); |
|
ip6gre_tunnel_link_md(ign, t); |
|
ip6gre_tunnel_link(ign, t); |
|
return 0; |
|
} |
|
|
|
static void ip6gre_dellink(struct net_device *dev, struct list_head *head) |
|
{ |
|
struct net *net = dev_net(dev); |
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id); |
|
|
|
if (dev != ign->fb_tunnel_dev) |
|
unregister_netdevice_queue(dev, head); |
|
} |
|
|
|
static size_t ip6gre_get_size(const struct net_device *dev) |
|
{ |
|
return |
|
/* IFLA_GRE_LINK */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_IFLAGS */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_OFLAGS */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_IKEY */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_OKEY */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_LOCAL */ |
|
nla_total_size(sizeof(struct in6_addr)) + |
|
/* IFLA_GRE_REMOTE */ |
|
nla_total_size(sizeof(struct in6_addr)) + |
|
/* IFLA_GRE_TTL */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_ENCAP_LIMIT */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_FLOWINFO */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_FLAGS */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_ENCAP_TYPE */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_ENCAP_FLAGS */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_ENCAP_SPORT */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_ENCAP_DPORT */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_COLLECT_METADATA */ |
|
nla_total_size(0) + |
|
/* IFLA_GRE_FWMARK */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_ERSPAN_INDEX */ |
|
nla_total_size(4) + |
|
0; |
|
} |
|
|
|
static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct __ip6_tnl_parm *p = &t->parms; |
|
__be16 o_flags = p->o_flags; |
|
|
|
if (p->erspan_ver == 1 || p->erspan_ver == 2) { |
|
if (!p->collect_md) |
|
o_flags |= TUNNEL_KEY; |
|
|
|
if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver)) |
|
goto nla_put_failure; |
|
|
|
if (p->erspan_ver == 1) { |
|
if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index)) |
|
goto nla_put_failure; |
|
} else { |
|
if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir)) |
|
goto nla_put_failure; |
|
if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid)) |
|
goto nla_put_failure; |
|
} |
|
} |
|
|
|
if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
|
nla_put_be16(skb, IFLA_GRE_IFLAGS, |
|
gre_tnl_flags_to_gre_flags(p->i_flags)) || |
|
nla_put_be16(skb, IFLA_GRE_OFLAGS, |
|
gre_tnl_flags_to_gre_flags(o_flags)) || |
|
nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
|
nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || |
|
nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) || |
|
nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) || |
|
nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || |
|
nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || |
|
nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || |
|
nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || |
|
nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) |
|
goto nla_put_failure; |
|
|
|
if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, |
|
t->encap.type) || |
|
nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
|
t->encap.sport) || |
|
nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, |
|
t->encap.dport) || |
|
nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
|
t->encap.flags)) |
|
goto nla_put_failure; |
|
|
|
if (p->collect_md) { |
|
if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) |
|
goto nla_put_failure; |
|
} |
|
|
|
return 0; |
|
|
|
nla_put_failure: |
|
return -EMSGSIZE; |
|
} |
|
|
|
static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { |
|
[IFLA_GRE_LINK] = { .type = NLA_U32 }, |
|
[IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
|
[IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
|
[IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
|
[IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
|
[IFLA_GRE_LOCAL] = { .len = sizeof_field(struct ipv6hdr, saddr) }, |
|
[IFLA_GRE_REMOTE] = { .len = sizeof_field(struct ipv6hdr, daddr) }, |
|
[IFLA_GRE_TTL] = { .type = NLA_U8 }, |
|
[IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 }, |
|
[IFLA_GRE_FLOWINFO] = { .type = NLA_U32 }, |
|
[IFLA_GRE_FLAGS] = { .type = NLA_U32 }, |
|
[IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
|
[IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, |
|
[IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, |
|
[IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, |
|
[IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
|
[IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
|
[IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
|
[IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, |
|
[IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, |
|
[IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, |
|
}; |
|
|
|
static void ip6erspan_tap_setup(struct net_device *dev) |
|
{ |
|
ether_setup(dev); |
|
|
|
dev->max_mtu = 0; |
|
dev->netdev_ops = &ip6erspan_netdev_ops; |
|
dev->needs_free_netdev = true; |
|
dev->priv_destructor = ip6gre_dev_free; |
|
|
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
netif_keep_dst(dev); |
|
} |
|
|
|
static int ip6erspan_newlink(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip6_tnl *nt = netdev_priv(dev); |
|
struct net *net = dev_net(dev); |
|
struct ip6gre_net *ign; |
|
int err; |
|
|
|
ip6gre_netlink_parms(data, &nt->parms); |
|
ip6erspan_set_version(data, &nt->parms); |
|
ign = net_generic(net, ip6gre_net_id); |
|
|
|
if (nt->parms.collect_md) { |
|
if (rtnl_dereference(ign->collect_md_tun_erspan)) |
|
return -EEXIST; |
|
} else { |
|
if (ip6gre_tunnel_find(net, &nt->parms, dev->type)) |
|
return -EEXIST; |
|
} |
|
|
|
err = ip6gre_newlink_common(src_net, dev, tb, data, extack); |
|
if (!err) { |
|
ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]); |
|
ip6erspan_tunnel_link_md(ign, nt); |
|
ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt); |
|
} |
|
return err; |
|
} |
|
|
|
static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu) |
|
{ |
|
ip6gre_tnl_link_config_common(t); |
|
ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t)); |
|
} |
|
|
|
static int ip6erspan_tnl_change(struct ip6_tnl *t, |
|
const struct __ip6_tnl_parm *p, int set_mtu) |
|
{ |
|
ip6gre_tnl_copy_tnl_parm(t, p); |
|
ip6erspan_tnl_link_config(t, set_mtu); |
|
return 0; |
|
} |
|
|
|
static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[], |
|
struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id); |
|
struct __ip6_tnl_parm p; |
|
struct ip6_tnl *t; |
|
|
|
t = ip6gre_changelink_common(dev, tb, data, &p, extack); |
|
if (IS_ERR(t)) |
|
return PTR_ERR(t); |
|
|
|
ip6erspan_set_version(data, &p); |
|
ip6gre_tunnel_unlink_md(ign, t); |
|
ip6gre_tunnel_unlink(ign, t); |
|
ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]); |
|
ip6erspan_tunnel_link_md(ign, t); |
|
ip6gre_tunnel_link(ign, t); |
|
return 0; |
|
} |
|
|
|
static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { |
|
.kind = "ip6gre", |
|
.maxtype = IFLA_GRE_MAX, |
|
.policy = ip6gre_policy, |
|
.priv_size = sizeof(struct ip6_tnl), |
|
.setup = ip6gre_tunnel_setup, |
|
.validate = ip6gre_tunnel_validate, |
|
.newlink = ip6gre_newlink, |
|
.changelink = ip6gre_changelink, |
|
.dellink = ip6gre_dellink, |
|
.get_size = ip6gre_get_size, |
|
.fill_info = ip6gre_fill_info, |
|
.get_link_net = ip6_tnl_get_link_net, |
|
}; |
|
|
|
static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = { |
|
.kind = "ip6gretap", |
|
.maxtype = IFLA_GRE_MAX, |
|
.policy = ip6gre_policy, |
|
.priv_size = sizeof(struct ip6_tnl), |
|
.setup = ip6gre_tap_setup, |
|
.validate = ip6gre_tap_validate, |
|
.newlink = ip6gre_newlink, |
|
.changelink = ip6gre_changelink, |
|
.get_size = ip6gre_get_size, |
|
.fill_info = ip6gre_fill_info, |
|
.get_link_net = ip6_tnl_get_link_net, |
|
}; |
|
|
|
static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = { |
|
.kind = "ip6erspan", |
|
.maxtype = IFLA_GRE_MAX, |
|
.policy = ip6gre_policy, |
|
.priv_size = sizeof(struct ip6_tnl), |
|
.setup = ip6erspan_tap_setup, |
|
.validate = ip6erspan_tap_validate, |
|
.newlink = ip6erspan_newlink, |
|
.changelink = ip6erspan_changelink, |
|
.get_size = ip6gre_get_size, |
|
.fill_info = ip6gre_fill_info, |
|
.get_link_net = ip6_tnl_get_link_net, |
|
}; |
|
|
|
/* |
|
* And now the modules code and kernel interface. |
|
*/ |
|
|
|
static int __init ip6gre_init(void) |
|
{ |
|
int err; |
|
|
|
pr_info("GRE over IPv6 tunneling driver\n"); |
|
|
|
err = register_pernet_device(&ip6gre_net_ops); |
|
if (err < 0) |
|
return err; |
|
|
|
err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE); |
|
if (err < 0) { |
|
pr_info("%s: can't add protocol\n", __func__); |
|
goto add_proto_failed; |
|
} |
|
|
|
err = rtnl_link_register(&ip6gre_link_ops); |
|
if (err < 0) |
|
goto rtnl_link_failed; |
|
|
|
err = rtnl_link_register(&ip6gre_tap_ops); |
|
if (err < 0) |
|
goto tap_ops_failed; |
|
|
|
err = rtnl_link_register(&ip6erspan_tap_ops); |
|
if (err < 0) |
|
goto erspan_link_failed; |
|
|
|
out: |
|
return err; |
|
|
|
erspan_link_failed: |
|
rtnl_link_unregister(&ip6gre_tap_ops); |
|
tap_ops_failed: |
|
rtnl_link_unregister(&ip6gre_link_ops); |
|
rtnl_link_failed: |
|
inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); |
|
add_proto_failed: |
|
unregister_pernet_device(&ip6gre_net_ops); |
|
goto out; |
|
} |
|
|
|
static void __exit ip6gre_fini(void) |
|
{ |
|
rtnl_link_unregister(&ip6gre_tap_ops); |
|
rtnl_link_unregister(&ip6gre_link_ops); |
|
rtnl_link_unregister(&ip6erspan_tap_ops); |
|
inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE); |
|
unregister_pernet_device(&ip6gre_net_ops); |
|
} |
|
|
|
module_init(ip6gre_init); |
|
module_exit(ip6gre_fini); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("D. Kozlov ([email protected])"); |
|
MODULE_DESCRIPTION("GRE over IPv6 tunneling device"); |
|
MODULE_ALIAS_RTNL_LINK("ip6gre"); |
|
MODULE_ALIAS_RTNL_LINK("ip6gretap"); |
|
MODULE_ALIAS_RTNL_LINK("ip6erspan"); |
|
MODULE_ALIAS_NETDEV("ip6gre0");
|
|
|