Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2 | * Linux NET3: GRE over IP protocol decoder. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | */ |
| 12 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 15 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/uaccess.h> |
| 21 | #include <linux/skbuff.h> |
| 22 | #include <linux/netdevice.h> |
| 23 | #include <linux/in.h> |
| 24 | #include <linux/tcp.h> |
| 25 | #include <linux/udp.h> |
| 26 | #include <linux/if_arp.h> |
| 27 | #include <linux/mroute.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/in6.h> |
| 30 | #include <linux/inetdevice.h> |
| 31 | #include <linux/igmp.h> |
| 32 | #include <linux/netfilter_ipv4.h> |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 33 | #include <linux/etherdevice.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 34 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <net/sock.h> |
| 37 | #include <net/ip.h> |
| 38 | #include <net/icmp.h> |
| 39 | #include <net/protocol.h> |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 40 | #include <net/ip_tunnels.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <net/arp.h> |
| 42 | #include <net/checksum.h> |
| 43 | #include <net/dsfield.h> |
| 44 | #include <net/inet_ecn.h> |
| 45 | #include <net/xfrm.h> |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 46 | #include <net/net_namespace.h> |
| 47 | #include <net/netns/generic.h> |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 48 | #include <net/rtnetlink.h> |
Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 49 | #include <net/gre.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 51 | #if IS_ENABLED(CONFIG_IPV6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <net/ipv6.h> |
| 53 | #include <net/ip6_fib.h> |
| 54 | #include <net/ip6_route.h> |
| 55 | #endif |
| 56 | |
| 57 | /* |
| 58 | Problems & solutions |
| 59 | -------------------- |
| 60 | |
| 61 | 1. The most important issue is detecting local dead loops. |
| 62 | They would cause complete host lockup in transmit, which |
| 63 | would be "resolved" by stack overflow or, if queueing is enabled, |
| 64 | with infinite looping in net_bh. |
| 65 | |
| 66 | We cannot track such dead loops during route installation, |
| 67 | it is infeasible task. The most general solutions would be |
| 68 | to keep skb->encapsulation counter (sort of local ttl), |
Eric Dumazet | 6d0722a | 2010-09-29 23:35:10 -0700 | [diff] [blame] | 69 | and silently drop packet when it expires. It is a good |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 70 | solution, but it supposes maintaining new variable in ALL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | skb, even if no tunneling is used. |
| 72 | |
Eric Dumazet | 6d0722a | 2010-09-29 23:35:10 -0700 | [diff] [blame] | 73 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
| 74 | counter, since when we enter the first ndo_xmit(), cpu migration is |
| 75 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | 2. Networking dead loops would not kill routers, but would really |
| 78 | kill network. IP hop limit plays role of "t->recursion" in this case, |
| 79 | if we copy it from packet being encapsulated to upper header. |
| 80 | It is very good solution, but it introduces two problems: |
| 81 | |
| 82 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), |
| 83 | do not work over tunnels. |
| 84 | - traceroute does not work. I planned to relay ICMP from tunnel, |
| 85 | so that this problem would be solved and traceroute output |
| 86 | would even more informative. This idea appeared to be wrong: |
| 87 | only Linux complies to rfc1812 now (yes, guys, Linux is the only |
| 88 | true router now :-)), all routers (at least, in neighbourhood of mine) |
| 89 | return only 8 bytes of payload. It is the end. |
| 90 | |
| 91 | Hence, if we want that OSPF worked or traceroute said something reasonable, |
| 92 | we should search for another solution. |
| 93 | |
| 94 | One of them is to parse packet trying to detect inner encapsulation |
| 95 | made by our node. It is difficult or even impossible, especially, |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 96 | taking into account fragmentation. TO be short, ttl is not solution at all. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | Current solution: The solution was UNEXPECTEDLY SIMPLE. |
| 99 | We force DF flag on tunnels with preconfigured hop limit, |
| 100 | that is ALL. :-) Well, it does not remove the problem completely, |
| 101 | but exponential growth of network traffic is changed to linear |
| 102 | (branches, that exceed pmtu are pruned) and tunnel mtu |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 103 | rapidly degrades to value <68, where looping stops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | Yes, it is not good if there exists a router in the loop, |
| 105 | which does not force DF, even when encapsulating packets have DF set. |
| 106 | But it is not our problem! Nobody could accuse us, we made |
| 107 | all that we could make. Even if it is your gated who injected |
| 108 | fatal route to network, even if it were you who configured |
| 109 | fatal static route: you are innocent. :-) |
| 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | Alexey Kuznetsov. |
| 112 | */ |
| 113 | |
stephen hemminger | eccc1bb | 2012-09-25 11:02:48 +0000 | [diff] [blame] | 114 | static bool log_ecn_error = true; |
| 115 | module_param(log_ecn_error, bool, 0644); |
| 116 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| 117 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 118 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | static int ipgre_tunnel_init(struct net_device *dev); |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 120 | |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 121 | static int ipgre_net_id __read_mostly; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 122 | static int gre_tap_net_id __read_mostly; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 123 | |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 124 | static int ipgre_err(struct sk_buff *skb, u32 info, |
| 125 | const struct tnl_ptk_info *tpi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 128 | /* All the routers (except for Linux) return only |
| 129 | 8 bytes of packet payload. It means, that precise relaying of |
| 130 | ICMP in the real Internet is absolutely infeasible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 132 | Moreover, Cisco "wise men" put GRE key to the third word |
| 133 | in GRE header. It makes impossible maintaining even soft |
| 134 | state for keyed GRE tunnels with enabled checksum. Tell |
| 135 | them "thank you". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 137 | Well, I wonder, rfc1812 was written by Cisco employee, |
| 138 | what the hell these idiots break standards established |
| 139 | by themselves??? |
| 140 | */ |
| 141 | struct net *net = dev_net(skb->dev); |
| 142 | struct ip_tunnel_net *itn; |
Eric Dumazet | 96f5a84 | 2013-05-18 08:36:03 +0000 | [diff] [blame] | 143 | const struct iphdr *iph; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 144 | const int type = icmp_hdr(skb)->type; |
| 145 | const int code = icmp_hdr(skb)->code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | struct ip_tunnel *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | switch (type) { |
| 149 | default: |
| 150 | case ICMP_PARAMETERPROB: |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 151 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | case ICMP_DEST_UNREACH: |
| 154 | switch (code) { |
| 155 | case ICMP_SR_FAILED: |
| 156 | case ICMP_PORT_UNREACH: |
| 157 | /* Impossible event. */ |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 158 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | default: |
| 160 | /* All others are translated to HOST_UNREACH. |
| 161 | rfc2003 contains "deep thoughts" about NET_UNREACH, |
| 162 | I believe they are just ether pollution. --ANK |
| 163 | */ |
| 164 | break; |
| 165 | } |
| 166 | break; |
| 167 | case ICMP_TIME_EXCEEDED: |
| 168 | if (code != ICMP_EXC_TTL) |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 169 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | break; |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 171 | |
| 172 | case ICMP_REDIRECT: |
| 173 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 176 | if (tpi->proto == htons(ETH_P_TEB)) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 177 | itn = net_generic(net, gre_tap_net_id); |
| 178 | else |
| 179 | itn = net_generic(net, ipgre_net_id); |
| 180 | |
Duan Jiong | c0c0c50 | 2014-01-28 11:49:43 +0800 | [diff] [blame] | 181 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 182 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
| 183 | iph->daddr, iph->saddr, tpi->key); |
stephen hemminger | d208328 | 2012-09-24 18:12:23 +0000 | [diff] [blame] | 184 | |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 185 | if (t == NULL) |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 186 | return PACKET_REJECT; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 187 | |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 188 | if (t->parms.iph.daddr == 0 || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 189 | ipv4_is_multicast(t->parms.iph.daddr)) |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 190 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 193 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
Wei Yongjun | da6185d8 | 2009-02-24 23:34:48 -0800 | [diff] [blame] | 195 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | t->err_count++; |
| 197 | else |
| 198 | t->err_count = 1; |
| 199 | t->err_time = jiffies; |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 200 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 203 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 205 | struct net *net = dev_net(skb->dev); |
| 206 | struct ip_tunnel_net *itn; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 207 | const struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | struct ip_tunnel *tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 210 | if (tpi->proto == htons(ETH_P_TEB)) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 211 | itn = net_generic(net, gre_tap_net_id); |
| 212 | else |
| 213 | itn = net_generic(net, ipgre_net_id); |
| 214 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 215 | iph = ip_hdr(skb); |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 216 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
| 217 | iph->saddr, iph->daddr, tpi->key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
stephen hemminger | d208328 | 2012-09-24 18:12:23 +0000 | [diff] [blame] | 219 | if (tunnel) { |
Timo Teräs | 0e3da5b | 2013-12-16 11:02:09 +0200 | [diff] [blame] | 220 | skb_pop_mac_header(skb); |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 221 | ip_tunnel_rcv(tunnel, skb, tpi, log_ecn_error); |
| 222 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 224 | return PACKET_REJECT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 227 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
| 228 | const struct iphdr *tnl_params, |
| 229 | __be16 proto) |
| 230 | { |
| 231 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 232 | struct tnl_ptk_info tpi; |
| 233 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 234 | tpi.flags = tunnel->parms.o_flags; |
| 235 | tpi.proto = proto; |
| 236 | tpi.key = tunnel->parms.o_key; |
| 237 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
| 238 | tunnel->o_seqno++; |
| 239 | tpi.seq = htonl(tunnel->o_seqno); |
Eric Dumazet | cef401d | 2013-01-25 20:34:37 +0000 | [diff] [blame] | 240 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 241 | /* Push GRE header. */ |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 242 | gre_build_header(skb, &tpi, tunnel->tun_hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Tom Herbert | 54bc9ba | 2014-09-29 20:22:32 -0700 | [diff] [blame] | 244 | skb_set_inner_protocol(skb, tpi.proto); |
| 245 | |
Nicolas Dichtel | bf3d6a8 | 2013-05-27 23:48:15 +0000 | [diff] [blame] | 246 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 249 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
| 250 | struct net_device *dev) |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 251 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 252 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 253 | const struct iphdr *tnl_params; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 254 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 255 | if (dev->header_ops) { |
| 256 | /* Need space for new headers */ |
| 257 | if (skb_cow_head(skb, dev->needed_headroom - |
Chen Gang | 2bac7cb | 2013-04-22 20:45:42 +0000 | [diff] [blame] | 258 | (tunnel->hlen + sizeof(struct iphdr)))) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 259 | goto free_skb; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 260 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 261 | tnl_params = (const struct iphdr *)skb->data; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 262 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 263 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
| 264 | * to gre header. |
| 265 | */ |
| 266 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); |
Timo Teräs | 8a0033a | 2014-12-15 09:24:13 +0200 | [diff] [blame] | 267 | skb_reset_mac_header(skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 268 | } else { |
| 269 | if (skb_cow_head(skb, dev->needed_headroom)) |
| 270 | goto free_skb; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 271 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 272 | tnl_params = &tunnel->parms.iph; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 273 | } |
| 274 | |
Timo Teräs | 8a0033a | 2014-12-15 09:24:13 +0200 | [diff] [blame] | 275 | skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); |
| 276 | if (IS_ERR(skb)) |
| 277 | goto out; |
| 278 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 279 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 280 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 281 | return NETDEV_TX_OK; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 282 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 283 | free_skb: |
Eric Dumazet | 3acfa1e | 2014-01-18 18:27:49 -0800 | [diff] [blame] | 284 | kfree_skb(skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 285 | out: |
| 286 | dev->stats.tx_dropped++; |
| 287 | return NETDEV_TX_OK; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 288 | } |
| 289 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 290 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
| 291 | struct net_device *dev) |
| 292 | { |
| 293 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 294 | |
Pravin B Shelar | 45f2e99 | 2013-06-17 17:49:51 -0700 | [diff] [blame] | 295 | skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 296 | if (IS_ERR(skb)) |
| 297 | goto out; |
| 298 | |
| 299 | if (skb_cow_head(skb, dev->needed_headroom)) |
| 300 | goto free_skb; |
| 301 | |
| 302 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
| 303 | |
| 304 | return NETDEV_TX_OK; |
| 305 | |
| 306 | free_skb: |
Eric Dumazet | 3acfa1e | 2014-01-18 18:27:49 -0800 | [diff] [blame] | 307 | kfree_skb(skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 308 | out: |
| 309 | dev->stats.tx_dropped++; |
| 310 | return NETDEV_TX_OK; |
| 311 | } |
| 312 | |
| 313 | static int ipgre_tunnel_ioctl(struct net_device *dev, |
| 314 | struct ifreq *ifr, int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | { |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 316 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | struct ip_tunnel_parm p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 319 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 320 | return -EFAULT; |
Cong Wang | 6c734fb | 2013-06-29 12:02:59 +0800 | [diff] [blame] | 321 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
| 322 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || |
| 323 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || |
| 324 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) |
| 325 | return -EINVAL; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 326 | } |
| 327 | p.i_flags = gre_flags_to_tnl_flags(p.i_flags); |
| 328 | p.o_flags = gre_flags_to_tnl_flags(p.o_flags); |
| 329 | |
| 330 | err = ip_tunnel_ioctl(dev, &p, cmd); |
| 331 | if (err) |
| 332 | return err; |
| 333 | |
| 334 | p.i_flags = tnl_flags_to_gre_flags(p.i_flags); |
| 335 | p.o_flags = tnl_flags_to_gre_flags(p.o_flags); |
| 336 | |
| 337 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 338 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | return 0; |
| 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | /* Nice toy. Unfortunately, useless in real life :-) |
| 343 | It allows to construct virtual multiprotocol broadcast "LAN" |
| 344 | over the Internet, provided multicast routing is tuned. |
| 345 | |
| 346 | |
| 347 | I have no idea was this bicycle invented before me, |
| 348 | so that I had to set ARPHRD_IPGRE to a random value. |
| 349 | I have an impression, that Cisco could make something similar, |
| 350 | but this feature is apparently missing in IOS<=11.2(8). |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
| 353 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
| 354 | |
| 355 | ping -t 255 224.66.66.66 |
| 356 | |
| 357 | If nobody answers, mbone does not work. |
| 358 | |
| 359 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
| 360 | ip addr add 10.66.66.<somewhat>/24 dev Universe |
| 361 | ifconfig Universe up |
| 362 | ifconfig Universe add fe80::<Your_real_addr>/10 |
| 363 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
| 364 | ftp 10.66.66.66 |
| 365 | ... |
| 366 | ftp fec0:6666:6666::193.233.7.65 |
| 367 | ... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | */ |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 369 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
| 370 | unsigned short type, |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 371 | const void *daddr, const void *saddr, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 373 | struct ip_tunnel *t = netdev_priv(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 374 | struct iphdr *iph; |
| 375 | struct gre_base_hdr *greh; |
| 376 | |
| 377 | iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph)); |
| 378 | greh = (struct gre_base_hdr *)(iph+1); |
| 379 | greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags); |
| 380 | greh->protocol = htons(type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 384 | /* Set the source hardware address. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | if (saddr) |
| 386 | memcpy(&iph->saddr, saddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 387 | if (daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | memcpy(&iph->daddr, daddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 389 | if (iph->daddr) |
Timo Teräs | 77a482b | 2013-08-06 13:45:43 +0300 | [diff] [blame] | 390 | return t->hlen + sizeof(*iph); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 391 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 392 | return -(t->hlen + sizeof(*iph)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 395 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
| 396 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 397 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 398 | memcpy(haddr, &iph->saddr, 4); |
| 399 | return 4; |
| 400 | } |
| 401 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 402 | static const struct header_ops ipgre_header_ops = { |
| 403 | .create = ipgre_header, |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 404 | .parse = ipgre_header_parse, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 405 | }; |
| 406 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 407 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | static int ipgre_open(struct net_device *dev) |
| 409 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 410 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 412 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 413 | struct flowi4 fl4; |
| 414 | struct rtable *rt; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 415 | |
Nicolas Dichtel | b57708a | 2014-04-22 10:15:23 +0200 | [diff] [blame] | 416 | rt = ip_route_output_gre(t->net, &fl4, |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 417 | t->parms.iph.daddr, |
| 418 | t->parms.iph.saddr, |
| 419 | t->parms.o_key, |
| 420 | RT_TOS(t->parms.iph.tos), |
| 421 | t->parms.link); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 422 | if (IS_ERR(rt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | return -EADDRNOTAVAIL; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 424 | dev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | ip_rt_put(rt); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 426 | if (__in_dev_get_rtnl(dev) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | return -EADDRNOTAVAIL; |
| 428 | t->mlink = dev->ifindex; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 429 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static int ipgre_close(struct net_device *dev) |
| 435 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 436 | struct ip_tunnel *t = netdev_priv(dev); |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 437 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 438 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
Denis V. Lunev | 7fee0ca | 2008-01-21 17:32:38 -0800 | [diff] [blame] | 439 | struct in_device *in_dev; |
Nicolas Dichtel | b57708a | 2014-04-22 10:15:23 +0200 | [diff] [blame] | 440 | in_dev = inetdev_by_index(t->net, t->mlink); |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 441 | if (in_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | return 0; |
| 445 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | #endif |
| 447 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 448 | static const struct net_device_ops ipgre_netdev_ops = { |
| 449 | .ndo_init = ipgre_tunnel_init, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 450 | .ndo_uninit = ip_tunnel_uninit, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 451 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
| 452 | .ndo_open = ipgre_open, |
| 453 | .ndo_stop = ipgre_close, |
| 454 | #endif |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 455 | .ndo_start_xmit = ipgre_xmit, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 456 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 457 | .ndo_change_mtu = ip_tunnel_change_mtu, |
| 458 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 459 | }; |
| 460 | |
Eric Dumazet | 6b78f16 | 2012-09-13 21:25:33 +0000 | [diff] [blame] | 461 | #define GRE_FEATURES (NETIF_F_SG | \ |
| 462 | NETIF_F_FRAGLIST | \ |
| 463 | NETIF_F_HIGHDMA | \ |
| 464 | NETIF_F_HW_CSUM) |
| 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | static void ipgre_tunnel_setup(struct net_device *dev) |
| 467 | { |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 468 | dev->netdev_ops = &ipgre_netdev_ops; |
Nicolas Dichtel | 5a45527 | 2014-04-11 15:51:18 +0200 | [diff] [blame] | 469 | dev->type = ARPHRD_IPGRE; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 470 | ip_tunnel_setup(dev, ipgre_net_id); |
| 471 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 473 | static void __gre_tunnel_init(struct net_device *dev) |
| 474 | { |
| 475 | struct ip_tunnel *tunnel; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 476 | int t_hlen; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 477 | |
| 478 | tunnel = netdev_priv(dev); |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 479 | tunnel->tun_hlen = ip_gre_calc_hlen(tunnel->parms.o_flags); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 480 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
| 481 | |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 482 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
| 483 | |
| 484 | t_hlen = tunnel->hlen + sizeof(struct iphdr); |
| 485 | |
| 486 | dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; |
| 487 | dev->mtu = ETH_DATA_LEN - t_hlen - 4; |
Eric Dumazet | 6b78f16 | 2012-09-13 21:25:33 +0000 | [diff] [blame] | 488 | |
Nicolas Dichtel | b57708a | 2014-04-22 10:15:23 +0200 | [diff] [blame] | 489 | dev->features |= GRE_FEATURES; |
Eric Dumazet | 6b78f16 | 2012-09-13 21:25:33 +0000 | [diff] [blame] | 490 | dev->hw_features |= GRE_FEATURES; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 491 | |
| 492 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { |
| 493 | /* TCP offload with GRE SEQ is not supported. */ |
| 494 | dev->features |= NETIF_F_GSO_SOFTWARE; |
| 495 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| 496 | /* Can use a lockless transmit, unless we generate |
| 497 | * output sequences |
| 498 | */ |
| 499 | dev->features |= NETIF_F_LLTX; |
| 500 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | static int ipgre_tunnel_init(struct net_device *dev) |
| 504 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 505 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 506 | struct iphdr *iph = &tunnel->parms.iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 508 | __gre_tunnel_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 510 | memcpy(dev->dev_addr, &iph->saddr, 4); |
| 511 | memcpy(dev->broadcast, &iph->daddr, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 513 | dev->flags = IFF_NOARP; |
Eric Dumazet | 0287587 | 2014-10-05 18:38:35 -0700 | [diff] [blame] | 514 | netif_keep_dst(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 515 | dev->addr_len = 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | if (iph->daddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 519 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (!iph->saddr) |
| 521 | return -EINVAL; |
| 522 | dev->flags = IFF_BROADCAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 523 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
| 525 | #endif |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 526 | } else |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 527 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 529 | return ip_tunnel_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
| 531 | |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 532 | static struct gre_cisco_protocol ipgre_protocol = { |
| 533 | .handler = ipgre_rcv, |
| 534 | .err_handler = ipgre_err, |
| 535 | .priority = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | }; |
| 537 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 538 | static int __net_init ipgre_init_net(struct net *net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 539 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 540 | return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 541 | } |
| 542 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 543 | static void __net_exit ipgre_exit_net(struct net *net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 544 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 545 | struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id); |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 546 | ip_tunnel_delete_net(itn, &ipgre_link_ops); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | static struct pernet_operations ipgre_net_ops = { |
| 550 | .init = ipgre_init_net, |
| 551 | .exit = ipgre_exit_net, |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 552 | .id = &ipgre_net_id, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 553 | .size = sizeof(struct ip_tunnel_net), |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 554 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 556 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 557 | { |
| 558 | __be16 flags; |
| 559 | |
| 560 | if (!data) |
| 561 | return 0; |
| 562 | |
| 563 | flags = 0; |
| 564 | if (data[IFLA_GRE_IFLAGS]) |
| 565 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 566 | if (data[IFLA_GRE_OFLAGS]) |
| 567 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 568 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
| 569 | return -EINVAL; |
| 570 | |
| 571 | return 0; |
| 572 | } |
| 573 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 574 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 575 | { |
| 576 | __be32 daddr; |
| 577 | |
| 578 | if (tb[IFLA_ADDRESS]) { |
| 579 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 580 | return -EINVAL; |
| 581 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 582 | return -EADDRNOTAVAIL; |
| 583 | } |
| 584 | |
| 585 | if (!data) |
| 586 | goto out; |
| 587 | |
| 588 | if (data[IFLA_GRE_REMOTE]) { |
| 589 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
| 590 | if (!daddr) |
| 591 | return -EINVAL; |
| 592 | } |
| 593 | |
| 594 | out: |
| 595 | return ipgre_tunnel_validate(tb, data); |
| 596 | } |
| 597 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 598 | static void ipgre_netlink_parms(struct nlattr *data[], struct nlattr *tb[], |
| 599 | struct ip_tunnel_parm *parms) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 600 | { |
Herbert Xu | 7bb82d9 | 2008-10-11 12:20:15 -0700 | [diff] [blame] | 601 | memset(parms, 0, sizeof(*parms)); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 602 | |
| 603 | parms->iph.protocol = IPPROTO_GRE; |
| 604 | |
| 605 | if (!data) |
| 606 | return; |
| 607 | |
| 608 | if (data[IFLA_GRE_LINK]) |
| 609 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
| 610 | |
| 611 | if (data[IFLA_GRE_IFLAGS]) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 612 | parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 613 | |
| 614 | if (data[IFLA_GRE_OFLAGS]) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 615 | parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 616 | |
| 617 | if (data[IFLA_GRE_IKEY]) |
| 618 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
| 619 | |
| 620 | if (data[IFLA_GRE_OKEY]) |
| 621 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
| 622 | |
| 623 | if (data[IFLA_GRE_LOCAL]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 624 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 625 | |
| 626 | if (data[IFLA_GRE_REMOTE]) |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 627 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 628 | |
| 629 | if (data[IFLA_GRE_TTL]) |
| 630 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); |
| 631 | |
| 632 | if (data[IFLA_GRE_TOS]) |
| 633 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); |
| 634 | |
| 635 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) |
| 636 | parms->iph.frag_off = htons(IP_DF); |
| 637 | } |
| 638 | |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 639 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
| 640 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], |
| 641 | struct ip_tunnel_encap *ipencap) |
| 642 | { |
| 643 | bool ret = false; |
| 644 | |
| 645 | memset(ipencap, 0, sizeof(*ipencap)); |
| 646 | |
| 647 | if (!data) |
| 648 | return ret; |
| 649 | |
| 650 | if (data[IFLA_GRE_ENCAP_TYPE]) { |
| 651 | ret = true; |
| 652 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); |
| 653 | } |
| 654 | |
| 655 | if (data[IFLA_GRE_ENCAP_FLAGS]) { |
| 656 | ret = true; |
| 657 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); |
| 658 | } |
| 659 | |
| 660 | if (data[IFLA_GRE_ENCAP_SPORT]) { |
| 661 | ret = true; |
Sabrina Dubroca | 3e97fa7 | 2015-02-06 17:22:22 +0100 | [diff] [blame] | 662 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 663 | } |
| 664 | |
| 665 | if (data[IFLA_GRE_ENCAP_DPORT]) { |
| 666 | ret = true; |
Sabrina Dubroca | 3e97fa7 | 2015-02-06 17:22:22 +0100 | [diff] [blame] | 667 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | return ret; |
| 671 | } |
| 672 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 673 | static int gre_tap_init(struct net_device *dev) |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 674 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 675 | __gre_tunnel_init(dev); |
stephen hemminger | bec94d430 | 2014-12-27 10:01:42 -0800 | [diff] [blame] | 676 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 677 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 678 | return ip_tunnel_init(dev); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 679 | } |
| 680 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 681 | static const struct net_device_ops gre_tap_netdev_ops = { |
| 682 | .ndo_init = gre_tap_init, |
| 683 | .ndo_uninit = ip_tunnel_uninit, |
| 684 | .ndo_start_xmit = gre_tap_xmit, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 685 | .ndo_set_mac_address = eth_mac_addr, |
| 686 | .ndo_validate_addr = eth_validate_addr, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 687 | .ndo_change_mtu = ip_tunnel_change_mtu, |
| 688 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 689 | }; |
| 690 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 691 | static void ipgre_tap_setup(struct net_device *dev) |
| 692 | { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 693 | ether_setup(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 694 | dev->netdev_ops = &gre_tap_netdev_ops; |
stephen hemminger | f8c1b7c | 2014-06-06 08:10:00 -0700 | [diff] [blame] | 695 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 696 | ip_tunnel_setup(dev, gre_tap_net_id); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 697 | } |
| 698 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 699 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
| 700 | struct nlattr *tb[], struct nlattr *data[]) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 701 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 702 | struct ip_tunnel_parm p; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 703 | struct ip_tunnel_encap ipencap; |
| 704 | |
| 705 | if (ipgre_netlink_encap_parms(data, &ipencap)) { |
| 706 | struct ip_tunnel *t = netdev_priv(dev); |
| 707 | int err = ip_tunnel_encap_setup(t, &ipencap); |
| 708 | |
| 709 | if (err < 0) |
| 710 | return err; |
| 711 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 712 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 713 | ipgre_netlink_parms(data, tb, &p); |
| 714 | return ip_tunnel_newlink(dev, tb, &p); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 715 | } |
| 716 | |
| 717 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
| 718 | struct nlattr *data[]) |
| 719 | { |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 720 | struct ip_tunnel_parm p; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 721 | struct ip_tunnel_encap ipencap; |
| 722 | |
| 723 | if (ipgre_netlink_encap_parms(data, &ipencap)) { |
| 724 | struct ip_tunnel *t = netdev_priv(dev); |
| 725 | int err = ip_tunnel_encap_setup(t, &ipencap); |
| 726 | |
| 727 | if (err < 0) |
| 728 | return err; |
| 729 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 730 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 731 | ipgre_netlink_parms(data, tb, &p); |
| 732 | return ip_tunnel_changelink(dev, tb, &p); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | static size_t ipgre_get_size(const struct net_device *dev) |
| 736 | { |
| 737 | return |
| 738 | /* IFLA_GRE_LINK */ |
| 739 | nla_total_size(4) + |
| 740 | /* IFLA_GRE_IFLAGS */ |
| 741 | nla_total_size(2) + |
| 742 | /* IFLA_GRE_OFLAGS */ |
| 743 | nla_total_size(2) + |
| 744 | /* IFLA_GRE_IKEY */ |
| 745 | nla_total_size(4) + |
| 746 | /* IFLA_GRE_OKEY */ |
| 747 | nla_total_size(4) + |
| 748 | /* IFLA_GRE_LOCAL */ |
| 749 | nla_total_size(4) + |
| 750 | /* IFLA_GRE_REMOTE */ |
| 751 | nla_total_size(4) + |
| 752 | /* IFLA_GRE_TTL */ |
| 753 | nla_total_size(1) + |
| 754 | /* IFLA_GRE_TOS */ |
| 755 | nla_total_size(1) + |
| 756 | /* IFLA_GRE_PMTUDISC */ |
| 757 | nla_total_size(1) + |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 758 | /* IFLA_GRE_ENCAP_TYPE */ |
| 759 | nla_total_size(2) + |
| 760 | /* IFLA_GRE_ENCAP_FLAGS */ |
| 761 | nla_total_size(2) + |
| 762 | /* IFLA_GRE_ENCAP_SPORT */ |
| 763 | nla_total_size(2) + |
| 764 | /* IFLA_GRE_ENCAP_DPORT */ |
| 765 | nla_total_size(2) + |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 766 | 0; |
| 767 | } |
| 768 | |
| 769 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 770 | { |
| 771 | struct ip_tunnel *t = netdev_priv(dev); |
| 772 | struct ip_tunnel_parm *p = &t->parms; |
| 773 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 774 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 775 | nla_put_be16(skb, IFLA_GRE_IFLAGS, tnl_flags_to_gre_flags(p->i_flags)) || |
| 776 | nla_put_be16(skb, IFLA_GRE_OFLAGS, tnl_flags_to_gre_flags(p->o_flags)) || |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 777 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
| 778 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || |
| 779 | nla_put_be32(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
| 780 | nla_put_be32(skb, IFLA_GRE_REMOTE, p->iph.daddr) || |
| 781 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
| 782 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || |
| 783 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, |
| 784 | !!(p->iph.frag_off & htons(IP_DF)))) |
| 785 | goto nla_put_failure; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 786 | |
| 787 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, |
| 788 | t->encap.type) || |
Sabrina Dubroca | 3e97fa7 | 2015-02-06 17:22:22 +0100 | [diff] [blame] | 789 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
| 790 | t->encap.sport) || |
| 791 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, |
| 792 | t->encap.dport) || |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 793 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
Tom Herbert | e1b2cb6 | 2014-11-05 16:49:38 -0800 | [diff] [blame] | 794 | t->encap.flags)) |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 795 | goto nla_put_failure; |
| 796 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 797 | return 0; |
| 798 | |
| 799 | nla_put_failure: |
| 800 | return -EMSGSIZE; |
| 801 | } |
| 802 | |
| 803 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
| 804 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
| 805 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
| 806 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
| 807 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
| 808 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 809 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
| 810 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 811 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
| 812 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, |
| 813 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 814 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
| 815 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, |
| 816 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, |
| 817 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 818 | }; |
| 819 | |
| 820 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
| 821 | .kind = "gre", |
| 822 | .maxtype = IFLA_GRE_MAX, |
| 823 | .policy = ipgre_policy, |
| 824 | .priv_size = sizeof(struct ip_tunnel), |
| 825 | .setup = ipgre_tunnel_setup, |
| 826 | .validate = ipgre_tunnel_validate, |
| 827 | .newlink = ipgre_newlink, |
| 828 | .changelink = ipgre_changelink, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 829 | .dellink = ip_tunnel_dellink, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 830 | .get_size = ipgre_get_size, |
| 831 | .fill_info = ipgre_fill_info, |
Nicolas Dichtel | 1728d4f | 2015-01-15 15:11:17 +0100 | [diff] [blame] | 832 | .get_link_net = ip_tunnel_get_link_net, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 833 | }; |
| 834 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 835 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
| 836 | .kind = "gretap", |
| 837 | .maxtype = IFLA_GRE_MAX, |
| 838 | .policy = ipgre_policy, |
| 839 | .priv_size = sizeof(struct ip_tunnel), |
| 840 | .setup = ipgre_tap_setup, |
| 841 | .validate = ipgre_tap_validate, |
| 842 | .newlink = ipgre_newlink, |
| 843 | .changelink = ipgre_changelink, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 844 | .dellink = ip_tunnel_dellink, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 845 | .get_size = ipgre_get_size, |
| 846 | .fill_info = ipgre_fill_info, |
Nicolas Dichtel | 1728d4f | 2015-01-15 15:11:17 +0100 | [diff] [blame] | 847 | .get_link_net = ip_tunnel_get_link_net, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 848 | }; |
| 849 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 850 | static int __net_init ipgre_tap_init_net(struct net *net) |
| 851 | { |
| 852 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, NULL); |
| 853 | } |
| 854 | |
| 855 | static void __net_exit ipgre_tap_exit_net(struct net *net) |
| 856 | { |
| 857 | struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id); |
Nicolas Dichtel | 6c742e7 | 2013-08-13 17:51:11 +0200 | [diff] [blame] | 858 | ip_tunnel_delete_net(itn, &ipgre_tap_ops); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 859 | } |
| 860 | |
| 861 | static struct pernet_operations ipgre_tap_net_ops = { |
| 862 | .init = ipgre_tap_init_net, |
| 863 | .exit = ipgre_tap_exit_net, |
| 864 | .id = &gre_tap_net_id, |
| 865 | .size = sizeof(struct ip_tunnel_net), |
| 866 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
| 868 | static int __init ipgre_init(void) |
| 869 | { |
| 870 | int err; |
| 871 | |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 872 | pr_info("GRE over IPv4 tunneling driver\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 874 | err = register_pernet_device(&ipgre_net_ops); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 875 | if (err < 0) |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 876 | return err; |
| 877 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 878 | err = register_pernet_device(&ipgre_tap_net_ops); |
| 879 | if (err < 0) |
| 880 | goto pnet_tap_faied; |
| 881 | |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 882 | err = gre_cisco_register(&ipgre_protocol); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 883 | if (err < 0) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 884 | pr_info("%s: can't add protocol\n", __func__); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 885 | goto add_proto_failed; |
| 886 | } |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 887 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 888 | err = rtnl_link_register(&ipgre_link_ops); |
| 889 | if (err < 0) |
| 890 | goto rtnl_link_failed; |
| 891 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 892 | err = rtnl_link_register(&ipgre_tap_ops); |
| 893 | if (err < 0) |
| 894 | goto tap_ops_failed; |
| 895 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 896 | return 0; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 897 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 898 | tap_ops_failed: |
| 899 | rtnl_link_unregister(&ipgre_link_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 900 | rtnl_link_failed: |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 901 | gre_cisco_unregister(&ipgre_protocol); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 902 | add_proto_failed: |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 903 | unregister_pernet_device(&ipgre_tap_net_ops); |
| 904 | pnet_tap_faied: |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 905 | unregister_pernet_device(&ipgre_net_ops); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 906 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
| 908 | |
Alexey Kuznetsov | db44575 | 2005-07-30 17:46:44 -0700 | [diff] [blame] | 909 | static void __exit ipgre_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 911 | rtnl_link_unregister(&ipgre_tap_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 912 | rtnl_link_unregister(&ipgre_link_ops); |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 913 | gre_cisco_unregister(&ipgre_protocol); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 914 | unregister_pernet_device(&ipgre_tap_net_ops); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 915 | unregister_pernet_device(&ipgre_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
| 917 | |
| 918 | module_init(ipgre_init); |
| 919 | module_exit(ipgre_fini); |
| 920 | MODULE_LICENSE("GPL"); |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 921 | MODULE_ALIAS_RTNL_LINK("gre"); |
| 922 | MODULE_ALIAS_RTNL_LINK("gretap"); |
Vasiliy Kulikov | 8909c9a | 2011-03-02 00:33:13 +0300 | [diff] [blame] | 923 | MODULE_ALIAS_NETDEV("gre0"); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 924 | MODULE_ALIAS_NETDEV("gretap0"); |