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 | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 20 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 27 | #include <linux/if_vlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 50 | #include <net/dst_metadata.h> |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 51 | #include <net/erspan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | /* |
| 54 | Problems & solutions |
| 55 | -------------------- |
| 56 | |
| 57 | 1. The most important issue is detecting local dead loops. |
| 58 | They would cause complete host lockup in transmit, which |
| 59 | would be "resolved" by stack overflow or, if queueing is enabled, |
| 60 | with infinite looping in net_bh. |
| 61 | |
| 62 | We cannot track such dead loops during route installation, |
| 63 | it is infeasible task. The most general solutions would be |
| 64 | to keep skb->encapsulation counter (sort of local ttl), |
Eric Dumazet | 6d0722a | 2010-09-29 23:35:10 -0700 | [diff] [blame] | 65 | and silently drop packet when it expires. It is a good |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 66 | solution, but it supposes maintaining new variable in ALL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | skb, even if no tunneling is used. |
| 68 | |
Eric Dumazet | 6d0722a | 2010-09-29 23:35:10 -0700 | [diff] [blame] | 69 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
| 70 | counter, since when we enter the first ndo_xmit(), cpu migration is |
| 71 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | 2. Networking dead loops would not kill routers, but would really |
| 74 | kill network. IP hop limit plays role of "t->recursion" in this case, |
| 75 | if we copy it from packet being encapsulated to upper header. |
| 76 | It is very good solution, but it introduces two problems: |
| 77 | |
| 78 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), |
| 79 | do not work over tunnels. |
| 80 | - traceroute does not work. I planned to relay ICMP from tunnel, |
| 81 | so that this problem would be solved and traceroute output |
| 82 | would even more informative. This idea appeared to be wrong: |
| 83 | only Linux complies to rfc1812 now (yes, guys, Linux is the only |
| 84 | true router now :-)), all routers (at least, in neighbourhood of mine) |
| 85 | return only 8 bytes of payload. It is the end. |
| 86 | |
| 87 | Hence, if we want that OSPF worked or traceroute said something reasonable, |
| 88 | we should search for another solution. |
| 89 | |
| 90 | One of them is to parse packet trying to detect inner encapsulation |
| 91 | made by our node. It is difficult or even impossible, especially, |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 92 | 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] | 93 | |
| 94 | Current solution: The solution was UNEXPECTEDLY SIMPLE. |
| 95 | We force DF flag on tunnels with preconfigured hop limit, |
| 96 | that is ALL. :-) Well, it does not remove the problem completely, |
| 97 | but exponential growth of network traffic is changed to linear |
| 98 | (branches, that exceed pmtu are pruned) and tunnel mtu |
stephen hemminger | bff5285 | 2012-02-24 08:08:20 +0000 | [diff] [blame] | 99 | rapidly degrades to value <68, where looping stops. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | Yes, it is not good if there exists a router in the loop, |
| 101 | which does not force DF, even when encapsulating packets have DF set. |
| 102 | But it is not our problem! Nobody could accuse us, we made |
| 103 | all that we could make. Even if it is your gated who injected |
| 104 | fatal route to network, even if it were you who configured |
| 105 | fatal static route: you are innocent. :-) |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | Alexey Kuznetsov. |
| 108 | */ |
| 109 | |
stephen hemminger | eccc1bb | 2012-09-25 11:02:48 +0000 | [diff] [blame] | 110 | static bool log_ecn_error = true; |
| 111 | module_param(log_ecn_error, bool, 0644); |
| 112 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
| 113 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 114 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | static int ipgre_tunnel_init(struct net_device *dev); |
William Tu | 1a66a83 | 2017-08-25 09:21:28 -0700 | [diff] [blame] | 116 | static void erspan_build_header(struct sk_buff *skb, |
| 117 | __be32 id, u32 index, bool truncate); |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 118 | |
Alexey Dobriyan | c7d03a0 | 2016-11-17 04:58:21 +0300 | [diff] [blame] | 119 | static unsigned int ipgre_net_id __read_mostly; |
| 120 | static unsigned int gre_tap_net_id __read_mostly; |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 121 | static unsigned int erspan_net_id __read_mostly; |
Pavel Emelyanov | eb8ce74 | 2008-04-16 01:10:26 -0700 | [diff] [blame] | 122 | |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 123 | static void ipgre_err(struct sk_buff *skb, u32 info, |
| 124 | const struct tnl_ptk_info *tpi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 127 | /* All the routers (except for Linux) return only |
| 128 | 8 bytes of packet payload. It means, that precise relaying of |
| 129 | ICMP in the real Internet is absolutely infeasible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 131 | Moreover, Cisco "wise men" put GRE key to the third word |
| 132 | in GRE header. It makes impossible maintaining even soft |
| 133 | state for keyed GRE tunnels with enabled checksum. Tell |
| 134 | them "thank you". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 136 | Well, I wonder, rfc1812 was written by Cisco employee, |
| 137 | what the hell these idiots break standards established |
| 138 | by themselves??? |
| 139 | */ |
| 140 | struct net *net = dev_net(skb->dev); |
| 141 | struct ip_tunnel_net *itn; |
Eric Dumazet | 96f5a84 | 2013-05-18 08:36:03 +0000 | [diff] [blame] | 142 | const struct iphdr *iph; |
Arnaldo Carvalho de Melo | 88c7664 | 2007-03-13 14:43:18 -0300 | [diff] [blame] | 143 | const int type = icmp_hdr(skb)->type; |
| 144 | const int code = icmp_hdr(skb)->code; |
Eric Dumazet | 20e1954 | 2016-06-18 21:52:06 -0700 | [diff] [blame] | 145 | unsigned int data_len = 0; |
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 | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 151 | return; |
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 | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 158 | return; |
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; |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | case ICMP_TIME_EXCEEDED: |
| 169 | if (code != ICMP_EXC_TTL) |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 170 | return; |
Eric Dumazet | 20e1954 | 2016-06-18 21:52:06 -0700 | [diff] [blame] | 171 | data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | break; |
David S. Miller | 55be7a9 | 2012-07-11 21:27:49 -0700 | [diff] [blame] | 173 | |
| 174 | case ICMP_REDIRECT: |
| 175 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 178 | if (tpi->proto == htons(ETH_P_TEB)) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 179 | itn = net_generic(net, gre_tap_net_id); |
| 180 | else |
| 181 | itn = net_generic(net, ipgre_net_id); |
| 182 | |
Duan Jiong | c0c0c50 | 2014-01-28 11:49:43 +0800 | [diff] [blame] | 183 | iph = (const struct iphdr *)(icmp_hdr(skb) + 1); |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 184 | t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
| 185 | iph->daddr, iph->saddr, tpi->key); |
stephen hemminger | d208328 | 2012-09-24 18:12:23 +0000 | [diff] [blame] | 186 | |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 187 | if (!t) |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 188 | return; |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 189 | |
Eric Dumazet | 9b8c6d7 | 2016-06-18 21:52:05 -0700 | [diff] [blame] | 190 | #if IS_ENABLED(CONFIG_IPV6) |
| 191 | if (tpi->proto == htons(ETH_P_IPV6) && |
Eric Dumazet | 20e1954 | 2016-06-18 21:52:06 -0700 | [diff] [blame] | 192 | !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, |
| 193 | type, data_len)) |
Eric Dumazet | 9b8c6d7 | 2016-06-18 21:52:05 -0700 | [diff] [blame] | 194 | return; |
| 195 | #endif |
| 196 | |
David S. Miller | 3639339 | 2012-06-14 22:21:46 -0700 | [diff] [blame] | 197 | if (t->parms.iph.daddr == 0 || |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 198 | ipv4_is_multicast(t->parms.iph.daddr)) |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 199 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
| 201 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 202 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Wei Yongjun | da6185d8 | 2009-02-24 23:34:48 -0800 | [diff] [blame] | 204 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | t->err_count++; |
| 206 | else |
| 207 | t->err_count = 1; |
| 208 | t->err_time = jiffies; |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | static void gre_err(struct sk_buff *skb, u32 info) |
| 212 | { |
| 213 | /* All the routers (except for Linux) return only |
| 214 | * 8 bytes of packet payload. It means, that precise relaying of |
| 215 | * ICMP in the real Internet is absolutely infeasible. |
| 216 | * |
| 217 | * Moreover, Cisco "wise men" put GRE key to the third word |
| 218 | * in GRE header. It makes impossible maintaining even soft |
| 219 | * state for keyed |
| 220 | * GRE tunnels with enabled checksum. Tell them "thank you". |
| 221 | * |
| 222 | * Well, I wonder, rfc1812 was written by Cisco employee, |
| 223 | * what the hell these idiots break standards established |
| 224 | * by themselves??? |
| 225 | */ |
| 226 | |
Eric Dumazet | e582615 | 2016-06-15 06:24:00 -0700 | [diff] [blame] | 227 | const struct iphdr *iph = (struct iphdr *)skb->data; |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 228 | const int type = icmp_hdr(skb)->type; |
| 229 | const int code = icmp_hdr(skb)->code; |
| 230 | struct tnl_ptk_info tpi; |
| 231 | bool csum_err = false; |
| 232 | |
Eric Dumazet | e582615 | 2016-06-15 06:24:00 -0700 | [diff] [blame] | 233 | if (gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), |
| 234 | iph->ihl * 4) < 0) { |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 235 | if (!csum_err) /* ignore csum errors. */ |
| 236 | return; |
| 237 | } |
| 238 | |
| 239 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { |
| 240 | ipv4_update_pmtu(skb, dev_net(skb->dev), info, |
| 241 | skb->dev->ifindex, 0, IPPROTO_GRE, 0); |
| 242 | return; |
| 243 | } |
| 244 | if (type == ICMP_REDIRECT) { |
| 245 | ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0, |
| 246 | IPPROTO_GRE, 0); |
| 247 | return; |
| 248 | } |
| 249 | |
| 250 | ipgre_err(skb, info, &tpi); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
| 252 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 253 | static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
| 254 | int gre_hdr_len) |
| 255 | { |
| 256 | struct net *net = dev_net(skb->dev); |
| 257 | struct metadata_dst *tun_dst = NULL; |
| 258 | struct ip_tunnel_net *itn; |
| 259 | struct ip_tunnel *tunnel; |
| 260 | struct erspanhdr *ershdr; |
| 261 | const struct iphdr *iph; |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 262 | __be32 index; |
| 263 | int len; |
| 264 | |
| 265 | itn = net_generic(net, erspan_net_id); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 266 | len = gre_hdr_len + sizeof(*ershdr); |
| 267 | |
| 268 | if (unlikely(!pskb_may_pull(skb, len))) |
| 269 | return -ENOMEM; |
| 270 | |
| 271 | iph = ip_hdr(skb); |
| 272 | ershdr = (struct erspanhdr *)(skb->data + gre_hdr_len); |
| 273 | |
| 274 | /* The original GRE header does not have key field, |
| 275 | * Use ERSPAN 10-bit session ID as key. |
| 276 | */ |
Xin Long | 935a974 | 2017-10-01 22:00:53 +0800 | [diff] [blame] | 277 | tpi->key = cpu_to_be32(ntohs(ershdr->session_id) & ID_MASK); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 278 | index = ershdr->md.index; |
| 279 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, |
| 280 | tpi->flags | TUNNEL_KEY, |
| 281 | iph->saddr, iph->daddr, tpi->key); |
| 282 | |
| 283 | if (tunnel) { |
| 284 | if (__iptunnel_pull_header(skb, |
| 285 | gre_hdr_len + sizeof(*ershdr), |
| 286 | htons(ETH_P_TEB), |
| 287 | false, false) < 0) |
| 288 | goto drop; |
| 289 | |
William Tu | 1a66a83 | 2017-08-25 09:21:28 -0700 | [diff] [blame] | 290 | if (tunnel->collect_md) { |
| 291 | struct ip_tunnel_info *info; |
| 292 | struct erspan_metadata *md; |
| 293 | __be64 tun_id; |
| 294 | __be16 flags; |
| 295 | |
| 296 | tpi->flags |= TUNNEL_KEY; |
| 297 | flags = tpi->flags; |
| 298 | tun_id = key32_to_tunnel_id(tpi->key); |
| 299 | |
| 300 | tun_dst = ip_tun_rx_dst(skb, flags, |
| 301 | tun_id, sizeof(*md)); |
| 302 | if (!tun_dst) |
| 303 | return PACKET_REJECT; |
| 304 | |
| 305 | md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
| 306 | if (!md) |
| 307 | return PACKET_REJECT; |
| 308 | |
| 309 | md->index = index; |
| 310 | info = &tun_dst->u.tun_info; |
| 311 | info->key.tun_flags |= TUNNEL_ERSPAN_OPT; |
| 312 | info->options_len = sizeof(*md); |
| 313 | } else { |
| 314 | tunnel->index = ntohl(index); |
| 315 | } |
| 316 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 317 | skb_reset_mac_header(skb); |
| 318 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
| 319 | return PACKET_RCVD; |
| 320 | } |
| 321 | drop: |
| 322 | kfree_skb(skb); |
| 323 | return PACKET_RCVD; |
| 324 | } |
| 325 | |
Jiri Benc | 125372f | 2016-05-03 17:10:08 +0200 | [diff] [blame] | 326 | static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
| 327 | struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 329 | struct metadata_dst *tun_dst = NULL; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 330 | const struct iphdr *iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | struct ip_tunnel *tunnel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 333 | iph = ip_hdr(skb); |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 334 | tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
| 335 | iph->saddr, iph->daddr, tpi->key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
stephen hemminger | d208328 | 2012-09-24 18:12:23 +0000 | [diff] [blame] | 337 | if (tunnel) { |
Jiri Benc | 125372f | 2016-05-03 17:10:08 +0200 | [diff] [blame] | 338 | if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, |
| 339 | raw_proto, false) < 0) |
Jiri Benc | 244a797 | 2016-05-03 17:10:07 +0200 | [diff] [blame] | 340 | goto drop; |
| 341 | |
Jiri Benc | e271c7b | 2016-05-11 15:53:57 +0200 | [diff] [blame] | 342 | if (tunnel->dev->type != ARPHRD_NONE) |
| 343 | skb_pop_mac_header(skb); |
| 344 | else |
| 345 | skb_reset_mac_header(skb); |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 346 | if (tunnel->collect_md) { |
Pravin B Shelar | c29a70d | 2015-08-26 23:46:50 -0700 | [diff] [blame] | 347 | __be16 flags; |
| 348 | __be64 tun_id; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 349 | |
Pravin B Shelar | c29a70d | 2015-08-26 23:46:50 -0700 | [diff] [blame] | 350 | flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
Amir Vadai | d817f43 | 2016-09-08 16:23:45 +0300 | [diff] [blame] | 351 | tun_id = key32_to_tunnel_id(tpi->key); |
Pravin B Shelar | c29a70d | 2015-08-26 23:46:50 -0700 | [diff] [blame] | 352 | tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 353 | if (!tun_dst) |
| 354 | return PACKET_REJECT; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 358 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | } |
Jiri Benc | 125372f | 2016-05-03 17:10:08 +0200 | [diff] [blame] | 360 | return PACKET_NEXT; |
Jiri Benc | 244a797 | 2016-05-03 17:10:07 +0200 | [diff] [blame] | 361 | |
| 362 | drop: |
| 363 | kfree_skb(skb); |
| 364 | return PACKET_RCVD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
| 366 | |
Jiri Benc | 125372f | 2016-05-03 17:10:08 +0200 | [diff] [blame] | 367 | static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
| 368 | int hdr_len) |
| 369 | { |
| 370 | struct net *net = dev_net(skb->dev); |
| 371 | struct ip_tunnel_net *itn; |
| 372 | int res; |
| 373 | |
| 374 | if (tpi->proto == htons(ETH_P_TEB)) |
| 375 | itn = net_generic(net, gre_tap_net_id); |
| 376 | else |
| 377 | itn = net_generic(net, ipgre_net_id); |
| 378 | |
| 379 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); |
| 380 | if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { |
| 381 | /* ipgre tunnels in collect metadata mode should receive |
| 382 | * also ETH_P_TEB traffic. |
| 383 | */ |
| 384 | itn = net_generic(net, ipgre_net_id); |
| 385 | res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); |
| 386 | } |
| 387 | return res; |
| 388 | } |
| 389 | |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 390 | static int gre_rcv(struct sk_buff *skb) |
| 391 | { |
| 392 | struct tnl_ptk_info tpi; |
| 393 | bool csum_err = false; |
Tom Herbert | 95f5c64 | 2016-04-29 17:12:16 -0700 | [diff] [blame] | 394 | int hdr_len; |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 395 | |
| 396 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
| 397 | if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { |
| 398 | /* Looped back packet, drop it! */ |
| 399 | if (rt_is_output_route(skb_rtable(skb))) |
| 400 | goto drop; |
| 401 | } |
| 402 | #endif |
| 403 | |
Eric Dumazet | e582615 | 2016-06-15 06:24:00 -0700 | [diff] [blame] | 404 | hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0); |
Jiri Benc | f132ae7 | 2016-05-03 15:00:21 +0200 | [diff] [blame] | 405 | if (hdr_len < 0) |
Tom Herbert | 95f5c64 | 2016-04-29 17:12:16 -0700 | [diff] [blame] | 406 | goto drop; |
| 407 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 408 | if (unlikely(tpi.proto == htons(ETH_P_ERSPAN))) { |
| 409 | if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
| 410 | return 0; |
| 411 | } |
| 412 | |
Jiri Benc | 244a797 | 2016-05-03 17:10:07 +0200 | [diff] [blame] | 413 | if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 414 | return 0; |
| 415 | |
| 416 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
| 417 | drop: |
| 418 | kfree_skb(skb); |
| 419 | return 0; |
| 420 | } |
| 421 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 422 | static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
| 423 | const struct iphdr *tnl_params, |
| 424 | __be16 proto) |
| 425 | { |
| 426 | struct ip_tunnel *tunnel = netdev_priv(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 427 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 428 | if (tunnel->parms.o_flags & TUNNEL_SEQ) |
| 429 | tunnel->o_seqno++; |
Eric Dumazet | cef401d | 2013-01-25 20:34:37 +0000 | [diff] [blame] | 430 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 431 | /* Push GRE header. */ |
Tom Herbert | 182a352 | 2016-04-29 17:12:19 -0700 | [diff] [blame] | 432 | gre_build_header(skb, tunnel->tun_hlen, |
| 433 | tunnel->parms.o_flags, proto, tunnel->parms.o_key, |
| 434 | htonl(tunnel->o_seqno)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
Nicolas Dichtel | bf3d6a8 | 2013-05-27 23:48:15 +0000 | [diff] [blame] | 436 | ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | } |
| 438 | |
Alexander Duyck | aed069d | 2016-04-14 15:33:37 -0400 | [diff] [blame] | 439 | static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
Pravin B Shelar | b2acd1d | 2015-08-07 23:51:47 -0700 | [diff] [blame] | 440 | { |
Edward Cree | 6fa7966 | 2016-02-11 21:02:31 +0000 | [diff] [blame] | 441 | return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
Pravin B Shelar | b2acd1d | 2015-08-07 23:51:47 -0700 | [diff] [blame] | 442 | } |
| 443 | |
Pravin B Shelar | fc4099f | 2015-10-22 18:17:16 -0700 | [diff] [blame] | 444 | static struct rtable *gre_get_rt(struct sk_buff *skb, |
| 445 | struct net_device *dev, |
| 446 | struct flowi4 *fl, |
| 447 | const struct ip_tunnel_key *key) |
| 448 | { |
| 449 | struct net *net = dev_net(dev); |
| 450 | |
| 451 | memset(fl, 0, sizeof(*fl)); |
| 452 | fl->daddr = key->u.ipv4.dst; |
| 453 | fl->saddr = key->u.ipv4.src; |
| 454 | fl->flowi4_tos = RT_TOS(key->tos); |
| 455 | fl->flowi4_mark = skb->mark; |
| 456 | fl->flowi4_proto = IPPROTO_GRE; |
| 457 | |
| 458 | return ip_route_output_key(net, fl); |
| 459 | } |
| 460 | |
William Tu | 862a03c | 2017-08-25 09:21:27 -0700 | [diff] [blame] | 461 | static struct rtable *prepare_fb_xmit(struct sk_buff *skb, |
| 462 | struct net_device *dev, |
| 463 | struct flowi4 *fl, |
| 464 | int tunnel_hlen) |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 465 | { |
| 466 | struct ip_tunnel_info *tun_info; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 467 | const struct ip_tunnel_key *key; |
Daniel Borkmann | db3c613 | 2016-03-04 15:15:07 +0100 | [diff] [blame] | 468 | struct rtable *rt = NULL; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 469 | int min_headroom; |
Daniel Borkmann | db3c613 | 2016-03-04 15:15:07 +0100 | [diff] [blame] | 470 | bool use_cache; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 471 | int err; |
| 472 | |
Jiri Benc | 61adedf | 2015-08-20 13:56:25 +0200 | [diff] [blame] | 473 | tun_info = skb_tunnel_info(skb); |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 474 | key = &tun_info->key; |
Daniel Borkmann | db3c613 | 2016-03-04 15:15:07 +0100 | [diff] [blame] | 475 | use_cache = ip_tunnel_dst_cache_usable(skb, tun_info); |
William Tu | 862a03c | 2017-08-25 09:21:27 -0700 | [diff] [blame] | 476 | |
Daniel Borkmann | db3c613 | 2016-03-04 15:15:07 +0100 | [diff] [blame] | 477 | if (use_cache) |
William Tu | 862a03c | 2017-08-25 09:21:27 -0700 | [diff] [blame] | 478 | rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl->saddr); |
Paolo Abeni | 3c1cb4d | 2016-02-12 15:43:59 +0100 | [diff] [blame] | 479 | if (!rt) { |
William Tu | 862a03c | 2017-08-25 09:21:27 -0700 | [diff] [blame] | 480 | rt = gre_get_rt(skb, dev, fl, key); |
Paolo Abeni | 3c1cb4d | 2016-02-12 15:43:59 +0100 | [diff] [blame] | 481 | if (IS_ERR(rt)) |
William Tu | 862a03c | 2017-08-25 09:21:27 -0700 | [diff] [blame] | 482 | goto err_free_skb; |
Daniel Borkmann | db3c613 | 2016-03-04 15:15:07 +0100 | [diff] [blame] | 483 | if (use_cache) |
Paolo Abeni | 3c1cb4d | 2016-02-12 15:43:59 +0100 | [diff] [blame] | 484 | dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst, |
William Tu | 862a03c | 2017-08-25 09:21:27 -0700 | [diff] [blame] | 485 | fl->saddr); |
Paolo Abeni | 3c1cb4d | 2016-02-12 15:43:59 +0100 | [diff] [blame] | 486 | } |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 487 | |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 488 | min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len |
| 489 | + tunnel_hlen + sizeof(struct iphdr); |
| 490 | if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) { |
| 491 | int head_delta = SKB_DATA_ALIGN(min_headroom - |
| 492 | skb_headroom(skb) + |
| 493 | 16); |
| 494 | err = pskb_expand_head(skb, max_t(int, head_delta, 0), |
| 495 | 0, GFP_ATOMIC); |
| 496 | if (unlikely(err)) |
| 497 | goto err_free_rt; |
| 498 | } |
William Tu | 862a03c | 2017-08-25 09:21:27 -0700 | [diff] [blame] | 499 | return rt; |
| 500 | |
| 501 | err_free_rt: |
| 502 | ip_rt_put(rt); |
| 503 | err_free_skb: |
| 504 | kfree_skb(skb); |
| 505 | dev->stats.tx_dropped++; |
| 506 | return NULL; |
| 507 | } |
| 508 | |
| 509 | static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
| 510 | __be16 proto) |
| 511 | { |
| 512 | struct ip_tunnel_info *tun_info; |
| 513 | const struct ip_tunnel_key *key; |
| 514 | struct rtable *rt = NULL; |
| 515 | struct flowi4 fl; |
| 516 | int tunnel_hlen; |
| 517 | __be16 df, flags; |
| 518 | |
| 519 | tun_info = skb_tunnel_info(skb); |
| 520 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
| 521 | ip_tunnel_info_af(tun_info) != AF_INET)) |
| 522 | goto err_free_skb; |
| 523 | |
| 524 | key = &tun_info->key; |
| 525 | tunnel_hlen = gre_calc_hlen(key->tun_flags); |
| 526 | |
| 527 | rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen); |
| 528 | if (!rt) |
| 529 | return; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 530 | |
| 531 | /* Push Tunnel header. */ |
Alexander Duyck | aed069d | 2016-04-14 15:33:37 -0400 | [diff] [blame] | 532 | if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 533 | goto err_free_rt; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 534 | |
| 535 | flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); |
David S. Miller | cba65321 | 2016-05-04 00:52:29 -0400 | [diff] [blame] | 536 | gre_build_header(skb, tunnel_hlen, flags, proto, |
Amir Vadai | d817f43 | 2016-09-08 16:23:45 +0300 | [diff] [blame] | 537 | tunnel_id_to_key32(tun_info->key.tun_id), 0); |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 538 | |
| 539 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
Pravin B Shelar | 039f506 | 2015-12-24 14:34:54 -0800 | [diff] [blame] | 540 | |
| 541 | iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE, |
| 542 | key->tos, key->ttl, df, false); |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 543 | return; |
| 544 | |
| 545 | err_free_rt: |
| 546 | ip_rt_put(rt); |
| 547 | err_free_skb: |
| 548 | kfree_skb(skb); |
| 549 | dev->stats.tx_dropped++; |
| 550 | } |
| 551 | |
William Tu | 1a66a83 | 2017-08-25 09:21:28 -0700 | [diff] [blame] | 552 | static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
| 553 | __be16 proto) |
| 554 | { |
| 555 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 556 | struct ip_tunnel_info *tun_info; |
| 557 | const struct ip_tunnel_key *key; |
| 558 | struct erspan_metadata *md; |
| 559 | struct rtable *rt = NULL; |
| 560 | bool truncate = false; |
| 561 | struct flowi4 fl; |
| 562 | int tunnel_hlen; |
| 563 | __be16 df; |
| 564 | |
| 565 | tun_info = skb_tunnel_info(skb); |
| 566 | if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
| 567 | ip_tunnel_info_af(tun_info) != AF_INET)) |
| 568 | goto err_free_skb; |
| 569 | |
| 570 | key = &tun_info->key; |
| 571 | |
| 572 | /* ERSPAN has fixed 8 byte GRE header */ |
| 573 | tunnel_hlen = 8 + sizeof(struct erspanhdr); |
| 574 | |
| 575 | rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen); |
| 576 | if (!rt) |
| 577 | return; |
| 578 | |
| 579 | if (gre_handle_offloads(skb, false)) |
| 580 | goto err_free_rt; |
| 581 | |
William Tu | f192970 | 2017-10-05 12:07:12 -0700 | [diff] [blame^] | 582 | if (skb->len > dev->mtu + dev->hard_header_len) { |
| 583 | pskb_trim(skb, dev->mtu + dev->hard_header_len); |
William Tu | 1a66a83 | 2017-08-25 09:21:28 -0700 | [diff] [blame] | 584 | truncate = true; |
| 585 | } |
| 586 | |
| 587 | md = ip_tunnel_info_opts(tun_info); |
| 588 | if (!md) |
| 589 | goto err_free_rt; |
| 590 | |
| 591 | erspan_build_header(skb, tunnel_id_to_key32(key->tun_id), |
| 592 | ntohl(md->index), truncate); |
| 593 | |
| 594 | gre_build_header(skb, 8, TUNNEL_SEQ, |
| 595 | htons(ETH_P_ERSPAN), 0, htonl(tunnel->o_seqno++)); |
| 596 | |
| 597 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
| 598 | |
| 599 | iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE, |
| 600 | key->tos, key->ttl, df, false); |
| 601 | return; |
| 602 | |
| 603 | err_free_rt: |
| 604 | ip_rt_put(rt); |
| 605 | err_free_skb: |
| 606 | kfree_skb(skb); |
| 607 | dev->stats.tx_dropped++; |
| 608 | } |
| 609 | |
Pravin B Shelar | fc4099f | 2015-10-22 18:17:16 -0700 | [diff] [blame] | 610 | static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
| 611 | { |
| 612 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
| 613 | struct rtable *rt; |
| 614 | struct flowi4 fl4; |
| 615 | |
| 616 | if (ip_tunnel_info_af(info) != AF_INET) |
| 617 | return -EINVAL; |
| 618 | |
| 619 | rt = gre_get_rt(skb, dev, &fl4, &info->key); |
| 620 | if (IS_ERR(rt)) |
| 621 | return PTR_ERR(rt); |
| 622 | |
| 623 | ip_rt_put(rt); |
| 624 | info->key.u.ipv4.src = fl4.saddr; |
| 625 | return 0; |
| 626 | } |
| 627 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 628 | static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
| 629 | struct net_device *dev) |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 630 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 631 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 632 | const struct iphdr *tnl_params; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 633 | |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 634 | if (tunnel->collect_md) { |
Jiri Benc | 2090714 | 2016-04-27 11:29:07 +0200 | [diff] [blame] | 635 | gre_fb_xmit(skb, dev, skb->protocol); |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 636 | return NETDEV_TX_OK; |
| 637 | } |
| 638 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 639 | if (dev->header_ops) { |
| 640 | /* Need space for new headers */ |
| 641 | if (skb_cow_head(skb, dev->needed_headroom - |
Chen Gang | 2bac7cb | 2013-04-22 20:45:42 +0000 | [diff] [blame] | 642 | (tunnel->hlen + sizeof(struct iphdr)))) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 643 | goto free_skb; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 644 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 645 | tnl_params = (const struct iphdr *)skb->data; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 646 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 647 | /* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
| 648 | * to gre header. |
| 649 | */ |
| 650 | skb_pull(skb, tunnel->hlen + sizeof(struct iphdr)); |
Timo Teräs | 8a0033a | 2014-12-15 09:24:13 +0200 | [diff] [blame] | 651 | skb_reset_mac_header(skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 652 | } else { |
| 653 | if (skb_cow_head(skb, dev->needed_headroom)) |
| 654 | goto free_skb; |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 655 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 656 | tnl_params = &tunnel->parms.iph; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 657 | } |
| 658 | |
Alexander Duyck | aed069d | 2016-04-14 15:33:37 -0400 | [diff] [blame] | 659 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
| 660 | goto free_skb; |
Timo Teräs | 8a0033a | 2014-12-15 09:24:13 +0200 | [diff] [blame] | 661 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 662 | __gre_xmit(skb, dev, tnl_params, skb->protocol); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 663 | return NETDEV_TX_OK; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 664 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 665 | free_skb: |
Eric Dumazet | 3acfa1e | 2014-01-18 18:27:49 -0800 | [diff] [blame] | 666 | kfree_skb(skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 667 | dev->stats.tx_dropped++; |
| 668 | return NETDEV_TX_OK; |
Michal Schmidt | ee34c1e | 2007-12-13 09:46:32 -0800 | [diff] [blame] | 669 | } |
| 670 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 671 | static inline u8 tos_to_cos(u8 tos) |
| 672 | { |
| 673 | u8 dscp, cos; |
| 674 | |
| 675 | dscp = tos >> 2; |
| 676 | cos = dscp >> 3; |
| 677 | return cos; |
| 678 | } |
| 679 | |
| 680 | static void erspan_build_header(struct sk_buff *skb, |
| 681 | __be32 id, u32 index, bool truncate) |
| 682 | { |
| 683 | struct iphdr *iphdr = ip_hdr(skb); |
| 684 | struct ethhdr *eth = eth_hdr(skb); |
| 685 | enum erspan_encap_type enc_type; |
| 686 | struct erspanhdr *ershdr; |
| 687 | struct qtag_prefix { |
| 688 | __be16 eth_type; |
| 689 | __be16 tci; |
| 690 | } *qp; |
| 691 | u16 vlan_tci = 0; |
| 692 | |
| 693 | enc_type = ERSPAN_ENCAP_NOVLAN; |
| 694 | |
| 695 | /* If mirrored packet has vlan tag, extract tci and |
| 696 | * perserve vlan header in the mirrored frame. |
| 697 | */ |
| 698 | if (eth->h_proto == htons(ETH_P_8021Q)) { |
| 699 | qp = (struct qtag_prefix *)(skb->data + 2 * ETH_ALEN); |
| 700 | vlan_tci = ntohs(qp->tci); |
| 701 | enc_type = ERSPAN_ENCAP_INFRAME; |
| 702 | } |
| 703 | |
| 704 | skb_push(skb, sizeof(*ershdr)); |
| 705 | ershdr = (struct erspanhdr *)skb->data; |
| 706 | memset(ershdr, 0, sizeof(*ershdr)); |
| 707 | |
| 708 | ershdr->ver_vlan = htons((vlan_tci & VLAN_MASK) | |
| 709 | (ERSPAN_VERSION << VER_OFFSET)); |
| 710 | ershdr->session_id = htons((u16)(ntohl(id) & ID_MASK) | |
| 711 | ((tos_to_cos(iphdr->tos) << COS_OFFSET) & COS_MASK) | |
| 712 | (enc_type << EN_OFFSET & EN_MASK) | |
| 713 | ((truncate << T_OFFSET) & T_MASK)); |
| 714 | ershdr->md.index = htonl(index & INDEX_MASK); |
| 715 | } |
| 716 | |
| 717 | static netdev_tx_t erspan_xmit(struct sk_buff *skb, |
| 718 | struct net_device *dev) |
| 719 | { |
| 720 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 721 | bool truncate = false; |
| 722 | |
William Tu | 1a66a83 | 2017-08-25 09:21:28 -0700 | [diff] [blame] | 723 | if (tunnel->collect_md) { |
| 724 | erspan_fb_xmit(skb, dev, skb->protocol); |
| 725 | return NETDEV_TX_OK; |
| 726 | } |
| 727 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 728 | if (gre_handle_offloads(skb, false)) |
| 729 | goto free_skb; |
| 730 | |
| 731 | if (skb_cow_head(skb, dev->needed_headroom)) |
| 732 | goto free_skb; |
| 733 | |
William Tu | f192970 | 2017-10-05 12:07:12 -0700 | [diff] [blame^] | 734 | if (skb->len > dev->mtu + dev->hard_header_len) { |
| 735 | pskb_trim(skb, dev->mtu + dev->hard_header_len); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 736 | truncate = true; |
| 737 | } |
| 738 | |
| 739 | /* Push ERSPAN header */ |
| 740 | erspan_build_header(skb, tunnel->parms.o_key, tunnel->index, truncate); |
| 741 | tunnel->parms.o_flags &= ~TUNNEL_KEY; |
| 742 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_ERSPAN)); |
| 743 | return NETDEV_TX_OK; |
| 744 | |
| 745 | free_skb: |
| 746 | kfree_skb(skb); |
| 747 | dev->stats.tx_dropped++; |
| 748 | return NETDEV_TX_OK; |
| 749 | } |
| 750 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 751 | static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
| 752 | struct net_device *dev) |
| 753 | { |
| 754 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 755 | |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 756 | if (tunnel->collect_md) { |
Jiri Benc | 2090714 | 2016-04-27 11:29:07 +0200 | [diff] [blame] | 757 | gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 758 | return NETDEV_TX_OK; |
| 759 | } |
| 760 | |
Alexander Duyck | aed069d | 2016-04-14 15:33:37 -0400 | [diff] [blame] | 761 | if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
| 762 | goto free_skb; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 763 | |
| 764 | if (skb_cow_head(skb, dev->needed_headroom)) |
| 765 | goto free_skb; |
| 766 | |
| 767 | __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 768 | return NETDEV_TX_OK; |
| 769 | |
| 770 | free_skb: |
Eric Dumazet | 3acfa1e | 2014-01-18 18:27:49 -0800 | [diff] [blame] | 771 | kfree_skb(skb); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 772 | dev->stats.tx_dropped++; |
| 773 | return NETDEV_TX_OK; |
| 774 | } |
| 775 | |
| 776 | static int ipgre_tunnel_ioctl(struct net_device *dev, |
| 777 | struct ifreq *ifr, int cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | { |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 779 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | struct ip_tunnel_parm p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 782 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) |
| 783 | return -EFAULT; |
Cong Wang | 6c734fb | 2013-06-29 12:02:59 +0800 | [diff] [blame] | 784 | if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
| 785 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || |
| 786 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || |
| 787 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) |
| 788 | return -EINVAL; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 789 | } |
| 790 | p.i_flags = gre_flags_to_tnl_flags(p.i_flags); |
| 791 | p.o_flags = gre_flags_to_tnl_flags(p.o_flags); |
| 792 | |
| 793 | err = ip_tunnel_ioctl(dev, &p, cmd); |
| 794 | if (err) |
| 795 | return err; |
| 796 | |
Tom Herbert | 95f5c64 | 2016-04-29 17:12:16 -0700 | [diff] [blame] | 797 | p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags); |
| 798 | p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 799 | |
| 800 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) |
| 801 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | return 0; |
| 803 | } |
| 804 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | /* Nice toy. Unfortunately, useless in real life :-) |
| 806 | It allows to construct virtual multiprotocol broadcast "LAN" |
| 807 | over the Internet, provided multicast routing is tuned. |
| 808 | |
| 809 | |
| 810 | I have no idea was this bicycle invented before me, |
| 811 | so that I had to set ARPHRD_IPGRE to a random value. |
| 812 | I have an impression, that Cisco could make something similar, |
| 813 | but this feature is apparently missing in IOS<=11.2(8). |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
| 816 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
| 817 | |
| 818 | ping -t 255 224.66.66.66 |
| 819 | |
| 820 | If nobody answers, mbone does not work. |
| 821 | |
| 822 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
| 823 | ip addr add 10.66.66.<somewhat>/24 dev Universe |
| 824 | ifconfig Universe up |
| 825 | ifconfig Universe add fe80::<Your_real_addr>/10 |
| 826 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
| 827 | ftp 10.66.66.66 |
| 828 | ... |
| 829 | ftp fec0:6666:6666::193.233.7.65 |
| 830 | ... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | */ |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 832 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
| 833 | unsigned short type, |
Eric Dumazet | 1507850 | 2010-09-15 11:07:53 +0000 | [diff] [blame] | 834 | const void *daddr, const void *saddr, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 836 | struct ip_tunnel *t = netdev_priv(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 837 | struct iphdr *iph; |
| 838 | struct gre_base_hdr *greh; |
| 839 | |
Johannes Berg | d58ff35 | 2017-06-16 14:29:23 +0200 | [diff] [blame] | 840 | iph = skb_push(skb, t->hlen + sizeof(*iph)); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 841 | greh = (struct gre_base_hdr *)(iph+1); |
Tom Herbert | 95f5c64 | 2016-04-29 17:12:16 -0700 | [diff] [blame] | 842 | greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 843 | greh->protocol = htons(type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
| 845 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 847 | /* Set the source hardware address. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | if (saddr) |
| 849 | memcpy(&iph->saddr, saddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 850 | if (daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | memcpy(&iph->daddr, daddr, 4); |
Timo Teräs | 6d55cb9 | 2010-03-03 04:01:13 +0000 | [diff] [blame] | 852 | if (iph->daddr) |
Timo Teräs | 77a482b | 2013-08-06 13:45:43 +0300 | [diff] [blame] | 853 | return t->hlen + sizeof(*iph); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 854 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 855 | return -(t->hlen + sizeof(*iph)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 858 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
| 859 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 860 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 861 | memcpy(haddr, &iph->saddr, 4); |
| 862 | return 4; |
| 863 | } |
| 864 | |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 865 | static const struct header_ops ipgre_header_ops = { |
| 866 | .create = ipgre_header, |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 867 | .parse = ipgre_header_parse, |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 868 | }; |
| 869 | |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 870 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | static int ipgre_open(struct net_device *dev) |
| 872 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 873 | struct ip_tunnel *t = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 875 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 876 | struct flowi4 fl4; |
| 877 | struct rtable *rt; |
Eric Dumazet | e985aad | 2010-09-27 03:57:11 +0000 | [diff] [blame] | 878 | |
Nicolas Dichtel | b57708a | 2014-04-22 10:15:23 +0200 | [diff] [blame] | 879 | rt = ip_route_output_gre(t->net, &fl4, |
David S. Miller | cbb1e85 | 2011-05-04 12:33:34 -0700 | [diff] [blame] | 880 | t->parms.iph.daddr, |
| 881 | t->parms.iph.saddr, |
| 882 | t->parms.o_key, |
| 883 | RT_TOS(t->parms.iph.tos), |
| 884 | t->parms.link); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 885 | if (IS_ERR(rt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | return -EADDRNOTAVAIL; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 887 | dev = rt->dst.dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | ip_rt_put(rt); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 889 | if (!__in_dev_get_rtnl(dev)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | return -EADDRNOTAVAIL; |
| 891 | t->mlink = dev->ifindex; |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 892 | 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] | 893 | } |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | static int ipgre_close(struct net_device *dev) |
| 898 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 899 | struct ip_tunnel *t = netdev_priv(dev); |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 900 | |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 901 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
Denis V. Lunev | 7fee0ca | 2008-01-21 17:32:38 -0800 | [diff] [blame] | 902 | struct in_device *in_dev; |
Nicolas Dichtel | b57708a | 2014-04-22 10:15:23 +0200 | [diff] [blame] | 903 | in_dev = inetdev_by_index(t->net, t->mlink); |
Eric Dumazet | 8723e1b | 2010-10-19 00:39:26 +0000 | [diff] [blame] | 904 | if (in_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | } |
| 907 | return 0; |
| 908 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | #endif |
| 910 | |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 911 | static const struct net_device_ops ipgre_netdev_ops = { |
| 912 | .ndo_init = ipgre_tunnel_init, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 913 | .ndo_uninit = ip_tunnel_uninit, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 914 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
| 915 | .ndo_open = ipgre_open, |
| 916 | .ndo_stop = ipgre_close, |
| 917 | #endif |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 918 | .ndo_start_xmit = ipgre_xmit, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 919 | .ndo_do_ioctl = ipgre_tunnel_ioctl, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 920 | .ndo_change_mtu = ip_tunnel_change_mtu, |
| 921 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
Nicolas Dichtel | 1e99584 | 2015-04-02 17:07:02 +0200 | [diff] [blame] | 922 | .ndo_get_iflink = ip_tunnel_get_iflink, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 923 | }; |
| 924 | |
Eric Dumazet | 6b78f16 | 2012-09-13 21:25:33 +0000 | [diff] [blame] | 925 | #define GRE_FEATURES (NETIF_F_SG | \ |
| 926 | NETIF_F_FRAGLIST | \ |
| 927 | NETIF_F_HIGHDMA | \ |
| 928 | NETIF_F_HW_CSUM) |
| 929 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | static void ipgre_tunnel_setup(struct net_device *dev) |
| 931 | { |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 932 | dev->netdev_ops = &ipgre_netdev_ops; |
Nicolas Dichtel | 5a45527 | 2014-04-11 15:51:18 +0200 | [diff] [blame] | 933 | dev->type = ARPHRD_IPGRE; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 934 | ip_tunnel_setup(dev, ipgre_net_id); |
| 935 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 937 | static void __gre_tunnel_init(struct net_device *dev) |
| 938 | { |
| 939 | struct ip_tunnel *tunnel; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 940 | int t_hlen; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 941 | |
| 942 | tunnel = netdev_priv(dev); |
Tom Herbert | 95f5c64 | 2016-04-29 17:12:16 -0700 | [diff] [blame] | 943 | tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 944 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
| 945 | |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 946 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
| 947 | |
| 948 | t_hlen = tunnel->hlen + sizeof(struct iphdr); |
| 949 | |
| 950 | dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; |
| 951 | dev->mtu = ETH_DATA_LEN - t_hlen - 4; |
Eric Dumazet | 6b78f16 | 2012-09-13 21:25:33 +0000 | [diff] [blame] | 952 | |
Nicolas Dichtel | b57708a | 2014-04-22 10:15:23 +0200 | [diff] [blame] | 953 | dev->features |= GRE_FEATURES; |
Eric Dumazet | 6b78f16 | 2012-09-13 21:25:33 +0000 | [diff] [blame] | 954 | dev->hw_features |= GRE_FEATURES; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 955 | |
| 956 | if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { |
Alexander Duyck | a0ca153 | 2016-04-05 09:13:39 -0700 | [diff] [blame] | 957 | /* TCP offload with GRE SEQ is not supported, nor |
| 958 | * can we support 2 levels of outer headers requiring |
| 959 | * an update. |
| 960 | */ |
| 961 | if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || |
| 962 | (tunnel->encap.type == TUNNEL_ENCAP_NONE)) { |
| 963 | dev->features |= NETIF_F_GSO_SOFTWARE; |
| 964 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
| 965 | } |
| 966 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 967 | /* Can use a lockless transmit, unless we generate |
| 968 | * output sequences |
| 969 | */ |
| 970 | dev->features |= NETIF_F_LLTX; |
| 971 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | static int ipgre_tunnel_init(struct net_device *dev) |
| 975 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 976 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 977 | struct iphdr *iph = &tunnel->parms.iph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 979 | __gre_tunnel_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 981 | memcpy(dev->dev_addr, &iph->saddr, 4); |
| 982 | memcpy(dev->broadcast, &iph->daddr, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 984 | dev->flags = IFF_NOARP; |
Eric Dumazet | 0287587 | 2014-10-05 18:38:35 -0700 | [diff] [blame] | 985 | netif_keep_dst(dev); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 986 | dev->addr_len = 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
Jiri Benc | a64b04d | 2016-04-27 11:29:06 +0200 | [diff] [blame] | 988 | if (iph->daddr && !tunnel->collect_md) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
Joe Perches | f97c1e0 | 2007-12-16 13:45:43 -0800 | [diff] [blame] | 990 | if (ipv4_is_multicast(iph->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | if (!iph->saddr) |
| 992 | return -EINVAL; |
| 993 | dev->flags = IFF_BROADCAST; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 994 | dev->header_ops = &ipgre_header_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | } |
| 996 | #endif |
Jiri Benc | a64b04d | 2016-04-27 11:29:06 +0200 | [diff] [blame] | 997 | } else if (!tunnel->collect_md) { |
Timo Teras | 6a5f44d | 2007-10-23 20:31:53 -0700 | [diff] [blame] | 998 | dev->header_ops = &ipgre_header_ops; |
Jiri Benc | a64b04d | 2016-04-27 11:29:06 +0200 | [diff] [blame] | 999 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1001 | return ip_tunnel_init(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 1004 | static const struct gre_protocol ipgre_protocol = { |
| 1005 | .handler = gre_rcv, |
| 1006 | .err_handler = gre_err, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | }; |
| 1008 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 1009 | static int __net_init ipgre_init_net(struct net *net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1010 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1011 | 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] | 1012 | } |
| 1013 | |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1014 | static void __net_exit ipgre_exit_batch_net(struct list_head *list_net) |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1015 | { |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1016 | ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1017 | } |
| 1018 | |
| 1019 | static struct pernet_operations ipgre_net_ops = { |
| 1020 | .init = ipgre_init_net, |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1021 | .exit_batch = ipgre_exit_batch_net, |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1022 | .id = &ipgre_net_id, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1023 | .size = sizeof(struct ip_tunnel_net), |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1024 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
Matthias Schiffer | a8b8a889 | 2017-06-25 23:56:01 +0200 | [diff] [blame] | 1026 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
| 1027 | struct netlink_ext_ack *extack) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1028 | { |
| 1029 | __be16 flags; |
| 1030 | |
| 1031 | if (!data) |
| 1032 | return 0; |
| 1033 | |
| 1034 | flags = 0; |
| 1035 | if (data[IFLA_GRE_IFLAGS]) |
| 1036 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1037 | if (data[IFLA_GRE_OFLAGS]) |
| 1038 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1039 | if (flags & (GRE_VERSION|GRE_ROUTING)) |
| 1040 | return -EINVAL; |
| 1041 | |
Jiri Benc | 946b636 | 2016-04-27 14:08:01 +0200 | [diff] [blame] | 1042 | if (data[IFLA_GRE_COLLECT_METADATA] && |
| 1043 | data[IFLA_GRE_ENCAP_TYPE] && |
| 1044 | nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) |
| 1045 | return -EINVAL; |
| 1046 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1047 | return 0; |
| 1048 | } |
| 1049 | |
Matthias Schiffer | a8b8a889 | 2017-06-25 23:56:01 +0200 | [diff] [blame] | 1050 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
| 1051 | struct netlink_ext_ack *extack) |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1052 | { |
| 1053 | __be32 daddr; |
| 1054 | |
| 1055 | if (tb[IFLA_ADDRESS]) { |
| 1056 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 1057 | return -EINVAL; |
| 1058 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 1059 | return -EADDRNOTAVAIL; |
| 1060 | } |
| 1061 | |
| 1062 | if (!data) |
| 1063 | goto out; |
| 1064 | |
| 1065 | if (data[IFLA_GRE_REMOTE]) { |
| 1066 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
| 1067 | if (!daddr) |
| 1068 | return -EINVAL; |
| 1069 | } |
| 1070 | |
| 1071 | out: |
Matthias Schiffer | a8b8a889 | 2017-06-25 23:56:01 +0200 | [diff] [blame] | 1072 | return ipgre_tunnel_validate(tb, data, extack); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1073 | } |
| 1074 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1075 | static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], |
| 1076 | struct netlink_ext_ack *extack) |
| 1077 | { |
| 1078 | __be16 flags = 0; |
| 1079 | int ret; |
| 1080 | |
| 1081 | if (!data) |
| 1082 | return 0; |
| 1083 | |
| 1084 | ret = ipgre_tap_validate(tb, data, extack); |
| 1085 | if (ret) |
| 1086 | return ret; |
| 1087 | |
| 1088 | /* ERSPAN should only have GRE sequence and key flag */ |
William Tu | 1a66a83 | 2017-08-25 09:21:28 -0700 | [diff] [blame] | 1089 | if (data[IFLA_GRE_OFLAGS]) |
| 1090 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
| 1091 | if (data[IFLA_GRE_IFLAGS]) |
| 1092 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
| 1093 | if (!data[IFLA_GRE_COLLECT_METADATA] && |
| 1094 | flags != (GRE_SEQ | GRE_KEY)) |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1095 | return -EINVAL; |
| 1096 | |
| 1097 | /* ERSPAN Session ID only has 10-bit. Since we reuse |
| 1098 | * 32-bit key field as ID, check it's range. |
| 1099 | */ |
| 1100 | if (data[IFLA_GRE_IKEY] && |
| 1101 | (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) |
| 1102 | return -EINVAL; |
| 1103 | |
| 1104 | if (data[IFLA_GRE_OKEY] && |
| 1105 | (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) |
| 1106 | return -EINVAL; |
| 1107 | |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1111 | static int ipgre_netlink_parms(struct net_device *dev, |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1112 | struct nlattr *data[], |
| 1113 | struct nlattr *tb[], |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1114 | struct ip_tunnel_parm *parms, |
| 1115 | __u32 *fwmark) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1116 | { |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1117 | struct ip_tunnel *t = netdev_priv(dev); |
| 1118 | |
Herbert Xu | 7bb82d9 | 2008-10-11 12:20:15 -0700 | [diff] [blame] | 1119 | memset(parms, 0, sizeof(*parms)); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1120 | |
| 1121 | parms->iph.protocol = IPPROTO_GRE; |
| 1122 | |
| 1123 | if (!data) |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1124 | return 0; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1125 | |
| 1126 | if (data[IFLA_GRE_LINK]) |
| 1127 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
| 1128 | |
| 1129 | if (data[IFLA_GRE_IFLAGS]) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1130 | 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] | 1131 | |
| 1132 | if (data[IFLA_GRE_OFLAGS]) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1133 | 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] | 1134 | |
| 1135 | if (data[IFLA_GRE_IKEY]) |
| 1136 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
| 1137 | |
| 1138 | if (data[IFLA_GRE_OKEY]) |
| 1139 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
| 1140 | |
| 1141 | if (data[IFLA_GRE_LOCAL]) |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 1142 | parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1143 | |
| 1144 | if (data[IFLA_GRE_REMOTE]) |
Jiri Benc | 67b61f6 | 2015-03-29 16:59:26 +0200 | [diff] [blame] | 1145 | parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1146 | |
| 1147 | if (data[IFLA_GRE_TTL]) |
| 1148 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); |
| 1149 | |
| 1150 | if (data[IFLA_GRE_TOS]) |
| 1151 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); |
| 1152 | |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1153 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) { |
| 1154 | if (t->ignore_df) |
| 1155 | return -EINVAL; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1156 | parms->iph.frag_off = htons(IP_DF); |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1157 | } |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1158 | |
| 1159 | if (data[IFLA_GRE_COLLECT_METADATA]) { |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1160 | t->collect_md = true; |
Jiri Benc | e271c7b | 2016-05-11 15:53:57 +0200 | [diff] [blame] | 1161 | if (dev->type == ARPHRD_IPGRE) |
| 1162 | dev->type = ARPHRD_NONE; |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1163 | } |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1164 | |
| 1165 | if (data[IFLA_GRE_IGNORE_DF]) { |
| 1166 | if (nla_get_u8(data[IFLA_GRE_IGNORE_DF]) |
| 1167 | && (parms->iph.frag_off & htons(IP_DF))) |
| 1168 | return -EINVAL; |
| 1169 | t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]); |
| 1170 | } |
| 1171 | |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1172 | if (data[IFLA_GRE_FWMARK]) |
| 1173 | *fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); |
| 1174 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1175 | if (data[IFLA_GRE_ERSPAN_INDEX]) { |
| 1176 | t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); |
| 1177 | |
| 1178 | if (t->index & ~INDEX_MASK) |
| 1179 | return -EINVAL; |
| 1180 | } |
| 1181 | |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1182 | return 0; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1183 | } |
| 1184 | |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1185 | /* This function returns true when ENCAP attributes are present in the nl msg */ |
| 1186 | static bool ipgre_netlink_encap_parms(struct nlattr *data[], |
| 1187 | struct ip_tunnel_encap *ipencap) |
| 1188 | { |
| 1189 | bool ret = false; |
| 1190 | |
| 1191 | memset(ipencap, 0, sizeof(*ipencap)); |
| 1192 | |
| 1193 | if (!data) |
| 1194 | return ret; |
| 1195 | |
| 1196 | if (data[IFLA_GRE_ENCAP_TYPE]) { |
| 1197 | ret = true; |
| 1198 | ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); |
| 1199 | } |
| 1200 | |
| 1201 | if (data[IFLA_GRE_ENCAP_FLAGS]) { |
| 1202 | ret = true; |
| 1203 | ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); |
| 1204 | } |
| 1205 | |
| 1206 | if (data[IFLA_GRE_ENCAP_SPORT]) { |
| 1207 | ret = true; |
Sabrina Dubroca | 3e97fa7 | 2015-02-06 17:22:22 +0100 | [diff] [blame] | 1208 | ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1209 | } |
| 1210 | |
| 1211 | if (data[IFLA_GRE_ENCAP_DPORT]) { |
| 1212 | ret = true; |
Sabrina Dubroca | 3e97fa7 | 2015-02-06 17:22:22 +0100 | [diff] [blame] | 1213 | ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1214 | } |
| 1215 | |
| 1216 | return ret; |
| 1217 | } |
| 1218 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1219 | static int gre_tap_init(struct net_device *dev) |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1220 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1221 | __gre_tunnel_init(dev); |
stephen hemminger | bec94d4 | 2014-12-27 10:01:42 -0800 | [diff] [blame] | 1222 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
Xin Long | d51711c | 2017-09-28 13:23:31 +0800 | [diff] [blame] | 1223 | netif_keep_dst(dev); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1224 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1225 | return ip_tunnel_init(dev); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1226 | } |
| 1227 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1228 | static const struct net_device_ops gre_tap_netdev_ops = { |
| 1229 | .ndo_init = gre_tap_init, |
| 1230 | .ndo_uninit = ip_tunnel_uninit, |
| 1231 | .ndo_start_xmit = gre_tap_xmit, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1232 | .ndo_set_mac_address = eth_mac_addr, |
| 1233 | .ndo_validate_addr = eth_validate_addr, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1234 | .ndo_change_mtu = ip_tunnel_change_mtu, |
| 1235 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
Nicolas Dichtel | 1e99584 | 2015-04-02 17:07:02 +0200 | [diff] [blame] | 1236 | .ndo_get_iflink = ip_tunnel_get_iflink, |
Pravin B Shelar | fc4099f | 2015-10-22 18:17:16 -0700 | [diff] [blame] | 1237 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
Stephen Hemminger | b8c26a3 | 2008-11-20 20:34:29 -0800 | [diff] [blame] | 1238 | }; |
| 1239 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1240 | static int erspan_tunnel_init(struct net_device *dev) |
| 1241 | { |
| 1242 | struct ip_tunnel *tunnel = netdev_priv(dev); |
| 1243 | int t_hlen; |
| 1244 | |
| 1245 | tunnel->tun_hlen = 8; |
| 1246 | tunnel->parms.iph.protocol = IPPROTO_GRE; |
Xin Long | c122fda | 2017-10-01 22:00:55 +0800 | [diff] [blame] | 1247 | tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
| 1248 | sizeof(struct erspanhdr); |
| 1249 | t_hlen = tunnel->hlen + sizeof(struct iphdr); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1250 | |
| 1251 | dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; |
| 1252 | dev->mtu = ETH_DATA_LEN - t_hlen - 4; |
| 1253 | dev->features |= GRE_FEATURES; |
| 1254 | dev->hw_features |= GRE_FEATURES; |
| 1255 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
Xin Long | c84bed4 | 2017-10-01 22:00:56 +0800 | [diff] [blame] | 1256 | netif_keep_dst(dev); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1257 | |
| 1258 | return ip_tunnel_init(dev); |
| 1259 | } |
| 1260 | |
| 1261 | static const struct net_device_ops erspan_netdev_ops = { |
| 1262 | .ndo_init = erspan_tunnel_init, |
| 1263 | .ndo_uninit = ip_tunnel_uninit, |
| 1264 | .ndo_start_xmit = erspan_xmit, |
| 1265 | .ndo_set_mac_address = eth_mac_addr, |
| 1266 | .ndo_validate_addr = eth_validate_addr, |
| 1267 | .ndo_change_mtu = ip_tunnel_change_mtu, |
| 1268 | .ndo_get_stats64 = ip_tunnel_get_stats64, |
| 1269 | .ndo_get_iflink = ip_tunnel_get_iflink, |
| 1270 | .ndo_fill_metadata_dst = gre_fill_metadata_dst, |
| 1271 | }; |
| 1272 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1273 | static void ipgre_tap_setup(struct net_device *dev) |
| 1274 | { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1275 | ether_setup(dev); |
Jiri Benc | d13b161 | 2016-02-17 15:32:53 +0100 | [diff] [blame] | 1276 | dev->netdev_ops = &gre_tap_netdev_ops; |
| 1277 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
| 1278 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1279 | ip_tunnel_setup(dev, gre_tap_net_id); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1280 | } |
| 1281 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1282 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
Matthias Schiffer | 7a3f4a1 | 2017-06-25 23:55:59 +0200 | [diff] [blame] | 1283 | struct nlattr *tb[], struct nlattr *data[], |
| 1284 | struct netlink_ext_ack *extack) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1285 | { |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1286 | struct ip_tunnel_parm p; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1287 | struct ip_tunnel_encap ipencap; |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1288 | __u32 fwmark = 0; |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1289 | int err; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1290 | |
| 1291 | if (ipgre_netlink_encap_parms(data, &ipencap)) { |
| 1292 | struct ip_tunnel *t = netdev_priv(dev); |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1293 | err = ip_tunnel_encap_setup(t, &ipencap); |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1294 | |
| 1295 | if (err < 0) |
| 1296 | return err; |
| 1297 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1298 | |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1299 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1300 | if (err < 0) |
| 1301 | return err; |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1302 | return ip_tunnel_newlink(dev, tb, &p, fwmark); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1303 | } |
| 1304 | |
| 1305 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
Matthias Schiffer | ad744b2 | 2017-06-25 23:56:00 +0200 | [diff] [blame] | 1306 | struct nlattr *data[], |
| 1307 | struct netlink_ext_ack *extack) |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1308 | { |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1309 | struct ip_tunnel *t = netdev_priv(dev); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1310 | struct ip_tunnel_parm p; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1311 | struct ip_tunnel_encap ipencap; |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1312 | __u32 fwmark = t->fwmark; |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1313 | int err; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1314 | |
| 1315 | if (ipgre_netlink_encap_parms(data, &ipencap)) { |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1316 | err = ip_tunnel_encap_setup(t, &ipencap); |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1317 | |
| 1318 | if (err < 0) |
| 1319 | return err; |
| 1320 | } |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1321 | |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1322 | err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1323 | if (err < 0) |
| 1324 | return err; |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1325 | return ip_tunnel_changelink(dev, tb, &p, fwmark); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1326 | } |
| 1327 | |
| 1328 | static size_t ipgre_get_size(const struct net_device *dev) |
| 1329 | { |
| 1330 | return |
| 1331 | /* IFLA_GRE_LINK */ |
| 1332 | nla_total_size(4) + |
| 1333 | /* IFLA_GRE_IFLAGS */ |
| 1334 | nla_total_size(2) + |
| 1335 | /* IFLA_GRE_OFLAGS */ |
| 1336 | nla_total_size(2) + |
| 1337 | /* IFLA_GRE_IKEY */ |
| 1338 | nla_total_size(4) + |
| 1339 | /* IFLA_GRE_OKEY */ |
| 1340 | nla_total_size(4) + |
| 1341 | /* IFLA_GRE_LOCAL */ |
| 1342 | nla_total_size(4) + |
| 1343 | /* IFLA_GRE_REMOTE */ |
| 1344 | nla_total_size(4) + |
| 1345 | /* IFLA_GRE_TTL */ |
| 1346 | nla_total_size(1) + |
| 1347 | /* IFLA_GRE_TOS */ |
| 1348 | nla_total_size(1) + |
| 1349 | /* IFLA_GRE_PMTUDISC */ |
| 1350 | nla_total_size(1) + |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1351 | /* IFLA_GRE_ENCAP_TYPE */ |
| 1352 | nla_total_size(2) + |
| 1353 | /* IFLA_GRE_ENCAP_FLAGS */ |
| 1354 | nla_total_size(2) + |
| 1355 | /* IFLA_GRE_ENCAP_SPORT */ |
| 1356 | nla_total_size(2) + |
| 1357 | /* IFLA_GRE_ENCAP_DPORT */ |
| 1358 | nla_total_size(2) + |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1359 | /* IFLA_GRE_COLLECT_METADATA */ |
| 1360 | nla_total_size(0) + |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1361 | /* IFLA_GRE_IGNORE_DF */ |
| 1362 | nla_total_size(1) + |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1363 | /* IFLA_GRE_FWMARK */ |
| 1364 | nla_total_size(4) + |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1365 | /* IFLA_GRE_ERSPAN_INDEX */ |
| 1366 | nla_total_size(4) + |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1367 | 0; |
| 1368 | } |
| 1369 | |
| 1370 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 1371 | { |
| 1372 | struct ip_tunnel *t = netdev_priv(dev); |
| 1373 | struct ip_tunnel_parm *p = &t->parms; |
| 1374 | |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1375 | if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
Tom Herbert | 95f5c64 | 2016-04-29 17:12:16 -0700 | [diff] [blame] | 1376 | nla_put_be16(skb, IFLA_GRE_IFLAGS, |
| 1377 | gre_tnl_flags_to_gre_flags(p->i_flags)) || |
| 1378 | nla_put_be16(skb, IFLA_GRE_OFLAGS, |
| 1379 | gre_tnl_flags_to_gre_flags(p->o_flags)) || |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1380 | nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
| 1381 | nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || |
Jiri Benc | 930345e | 2015-03-29 16:59:25 +0200 | [diff] [blame] | 1382 | nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
| 1383 | nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1384 | nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
| 1385 | nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || |
| 1386 | nla_put_u8(skb, IFLA_GRE_PMTUDISC, |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1387 | !!(p->iph.frag_off & htons(IP_DF))) || |
| 1388 | nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark)) |
David S. Miller | f3756b7 | 2012-04-01 20:39:02 -0400 | [diff] [blame] | 1389 | goto nla_put_failure; |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1390 | |
| 1391 | if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, |
| 1392 | t->encap.type) || |
Sabrina Dubroca | 3e97fa7 | 2015-02-06 17:22:22 +0100 | [diff] [blame] | 1393 | nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
| 1394 | t->encap.sport) || |
| 1395 | nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, |
| 1396 | t->encap.dport) || |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1397 | nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
Tom Herbert | e1b2cb6 | 2014-11-05 16:49:38 -0800 | [diff] [blame] | 1398 | t->encap.flags)) |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1399 | goto nla_put_failure; |
| 1400 | |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1401 | if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df)) |
| 1402 | goto nla_put_failure; |
| 1403 | |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1404 | if (t->collect_md) { |
| 1405 | if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) |
| 1406 | goto nla_put_failure; |
| 1407 | } |
| 1408 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1409 | if (t->index) |
| 1410 | if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) |
| 1411 | goto nla_put_failure; |
| 1412 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1413 | return 0; |
| 1414 | |
| 1415 | nla_put_failure: |
| 1416 | return -EMSGSIZE; |
| 1417 | } |
| 1418 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1419 | static void erspan_setup(struct net_device *dev) |
| 1420 | { |
| 1421 | ether_setup(dev); |
| 1422 | dev->netdev_ops = &erspan_netdev_ops; |
| 1423 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
| 1424 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
| 1425 | ip_tunnel_setup(dev, erspan_net_id); |
| 1426 | } |
| 1427 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1428 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
| 1429 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, |
| 1430 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
| 1431 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
| 1432 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
| 1433 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1434 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
| 1435 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1436 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
| 1437 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, |
| 1438 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
Tom Herbert | 4565e99 | 2014-09-17 12:26:01 -0700 | [diff] [blame] | 1439 | [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
| 1440 | [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, |
| 1441 | [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, |
| 1442 | [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1443 | [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
Philip Prindeville | 22a59be | 2016-06-14 15:53:02 -0600 | [diff] [blame] | 1444 | [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 }, |
Craig Gallek | 9830ad4 | 2017-04-19 12:30:54 -0400 | [diff] [blame] | 1445 | [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1446 | [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1447 | }; |
| 1448 | |
| 1449 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
| 1450 | .kind = "gre", |
| 1451 | .maxtype = IFLA_GRE_MAX, |
| 1452 | .policy = ipgre_policy, |
| 1453 | .priv_size = sizeof(struct ip_tunnel), |
| 1454 | .setup = ipgre_tunnel_setup, |
| 1455 | .validate = ipgre_tunnel_validate, |
| 1456 | .newlink = ipgre_newlink, |
| 1457 | .changelink = ipgre_changelink, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1458 | .dellink = ip_tunnel_dellink, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1459 | .get_size = ipgre_get_size, |
| 1460 | .fill_info = ipgre_fill_info, |
Nicolas Dichtel | 1728d4f | 2015-01-15 15:11:17 +0100 | [diff] [blame] | 1461 | .get_link_net = ip_tunnel_get_link_net, |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1462 | }; |
| 1463 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1464 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
| 1465 | .kind = "gretap", |
| 1466 | .maxtype = IFLA_GRE_MAX, |
| 1467 | .policy = ipgre_policy, |
| 1468 | .priv_size = sizeof(struct ip_tunnel), |
| 1469 | .setup = ipgre_tap_setup, |
| 1470 | .validate = ipgre_tap_validate, |
| 1471 | .newlink = ipgre_newlink, |
| 1472 | .changelink = ipgre_changelink, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1473 | .dellink = ip_tunnel_dellink, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1474 | .get_size = ipgre_get_size, |
| 1475 | .fill_info = ipgre_fill_info, |
Nicolas Dichtel | 1728d4f | 2015-01-15 15:11:17 +0100 | [diff] [blame] | 1476 | .get_link_net = ip_tunnel_get_link_net, |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1477 | }; |
| 1478 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1479 | static struct rtnl_link_ops erspan_link_ops __read_mostly = { |
| 1480 | .kind = "erspan", |
| 1481 | .maxtype = IFLA_GRE_MAX, |
| 1482 | .policy = ipgre_policy, |
| 1483 | .priv_size = sizeof(struct ip_tunnel), |
| 1484 | .setup = erspan_setup, |
| 1485 | .validate = erspan_validate, |
| 1486 | .newlink = ipgre_newlink, |
| 1487 | .changelink = ipgre_changelink, |
| 1488 | .dellink = ip_tunnel_dellink, |
| 1489 | .get_size = ipgre_get_size, |
| 1490 | .fill_info = ipgre_fill_info, |
| 1491 | .get_link_net = ip_tunnel_get_link_net, |
| 1492 | }; |
| 1493 | |
Pravin B Shelar | b2acd1d | 2015-08-07 23:51:47 -0700 | [diff] [blame] | 1494 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
| 1495 | u8 name_assign_type) |
| 1496 | { |
| 1497 | struct nlattr *tb[IFLA_MAX + 1]; |
| 1498 | struct net_device *dev; |
Nicolas Dichtel | 106da66 | 2016-06-13 10:31:04 +0200 | [diff] [blame] | 1499 | LIST_HEAD(list_kill); |
Pravin B Shelar | b2acd1d | 2015-08-07 23:51:47 -0700 | [diff] [blame] | 1500 | struct ip_tunnel *t; |
| 1501 | int err; |
| 1502 | |
| 1503 | memset(&tb, 0, sizeof(tb)); |
| 1504 | |
| 1505 | dev = rtnl_create_link(net, name, name_assign_type, |
| 1506 | &ipgre_tap_ops, tb); |
| 1507 | if (IS_ERR(dev)) |
| 1508 | return dev; |
| 1509 | |
| 1510 | /* Configure flow based GRE device. */ |
| 1511 | t = netdev_priv(dev); |
| 1512 | t->collect_md = true; |
| 1513 | |
Matthias Schiffer | 7a3f4a1 | 2017-06-25 23:55:59 +0200 | [diff] [blame] | 1514 | err = ipgre_newlink(net, dev, tb, NULL, NULL); |
Nicolas Dichtel | 106da66 | 2016-06-13 10:31:04 +0200 | [diff] [blame] | 1515 | if (err < 0) { |
| 1516 | free_netdev(dev); |
| 1517 | return ERR_PTR(err); |
| 1518 | } |
David Wragg | 7e05915 | 2016-02-10 00:05:58 +0000 | [diff] [blame] | 1519 | |
| 1520 | /* openvswitch users expect packet sizes to be unrestricted, |
| 1521 | * so set the largest MTU we can. |
| 1522 | */ |
| 1523 | err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); |
| 1524 | if (err) |
| 1525 | goto out; |
| 1526 | |
Nicolas Dichtel | da6f1da | 2016-06-13 10:31:06 +0200 | [diff] [blame] | 1527 | err = rtnl_configure_link(dev, NULL); |
| 1528 | if (err < 0) |
| 1529 | goto out; |
| 1530 | |
Pravin B Shelar | b2acd1d | 2015-08-07 23:51:47 -0700 | [diff] [blame] | 1531 | return dev; |
| 1532 | out: |
Nicolas Dichtel | 106da66 | 2016-06-13 10:31:04 +0200 | [diff] [blame] | 1533 | ip_tunnel_dellink(dev, &list_kill); |
| 1534 | unregister_netdevice_many(&list_kill); |
Pravin B Shelar | b2acd1d | 2015-08-07 23:51:47 -0700 | [diff] [blame] | 1535 | return ERR_PTR(err); |
| 1536 | } |
| 1537 | EXPORT_SYMBOL_GPL(gretap_fb_dev_create); |
| 1538 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1539 | static int __net_init ipgre_tap_init_net(struct net *net) |
| 1540 | { |
Pravin B Shelar | 2e15ea3 | 2015-08-07 23:51:42 -0700 | [diff] [blame] | 1541 | return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1542 | } |
| 1543 | |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1544 | static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net) |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1545 | { |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1546 | ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1547 | } |
| 1548 | |
| 1549 | static struct pernet_operations ipgre_tap_net_ops = { |
| 1550 | .init = ipgre_tap_init_net, |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1551 | .exit_batch = ipgre_tap_exit_batch_net, |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1552 | .id = &gre_tap_net_id, |
| 1553 | .size = sizeof(struct ip_tunnel_net), |
| 1554 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1556 | static int __net_init erspan_init_net(struct net *net) |
| 1557 | { |
| 1558 | return ip_tunnel_init_net(net, erspan_net_id, |
| 1559 | &erspan_link_ops, "erspan0"); |
| 1560 | } |
| 1561 | |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1562 | static void __net_exit erspan_exit_batch_net(struct list_head *net_list) |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1563 | { |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1564 | ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1565 | } |
| 1566 | |
| 1567 | static struct pernet_operations erspan_net_ops = { |
| 1568 | .init = erspan_init_net, |
Eric Dumazet | 64bc178 | 2017-09-19 16:27:09 -0700 | [diff] [blame] | 1569 | .exit_batch = erspan_exit_batch_net, |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1570 | .id = &erspan_net_id, |
| 1571 | .size = sizeof(struct ip_tunnel_net), |
| 1572 | }; |
| 1573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | static int __init ipgre_init(void) |
| 1575 | { |
| 1576 | int err; |
| 1577 | |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1578 | pr_info("GRE over IPv4 tunneling driver\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | |
Eric W. Biederman | cfb8fbf | 2009-11-29 15:46:13 +0000 | [diff] [blame] | 1580 | err = register_pernet_device(&ipgre_net_ops); |
Pavel Emelyanov | 59a4c75 | 2008-04-16 01:08:53 -0700 | [diff] [blame] | 1581 | if (err < 0) |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1582 | return err; |
| 1583 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1584 | err = register_pernet_device(&ipgre_tap_net_ops); |
| 1585 | if (err < 0) |
William Tu | e3d0328 | 2017-08-22 17:04:05 -0700 | [diff] [blame] | 1586 | goto pnet_tap_failed; |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1587 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1588 | err = register_pernet_device(&erspan_net_ops); |
| 1589 | if (err < 0) |
| 1590 | goto pnet_erspan_failed; |
| 1591 | |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 1592 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1593 | if (err < 0) { |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 1594 | pr_info("%s: can't add protocol\n", __func__); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1595 | goto add_proto_failed; |
| 1596 | } |
Pavel Emelyanov | 7daa000 | 2008-04-16 01:10:05 -0700 | [diff] [blame] | 1597 | |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1598 | err = rtnl_link_register(&ipgre_link_ops); |
| 1599 | if (err < 0) |
| 1600 | goto rtnl_link_failed; |
| 1601 | |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1602 | err = rtnl_link_register(&ipgre_tap_ops); |
| 1603 | if (err < 0) |
| 1604 | goto tap_ops_failed; |
| 1605 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1606 | err = rtnl_link_register(&erspan_link_ops); |
| 1607 | if (err < 0) |
| 1608 | goto erspan_link_failed; |
| 1609 | |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1610 | return 0; |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1611 | |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1612 | erspan_link_failed: |
| 1613 | rtnl_link_unregister(&ipgre_tap_ops); |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1614 | tap_ops_failed: |
| 1615 | rtnl_link_unregister(&ipgre_link_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1616 | rtnl_link_failed: |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 1617 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1618 | add_proto_failed: |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1619 | unregister_pernet_device(&erspan_net_ops); |
| 1620 | pnet_erspan_failed: |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1621 | unregister_pernet_device(&ipgre_tap_net_ops); |
William Tu | e3d0328 | 2017-08-22 17:04:05 -0700 | [diff] [blame] | 1622 | pnet_tap_failed: |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1623 | unregister_pernet_device(&ipgre_net_ops); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1624 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | } |
| 1626 | |
Alexey Kuznetsov | db44575 | 2005-07-30 17:46:44 -0700 | [diff] [blame] | 1627 | static void __exit ipgre_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | { |
Herbert Xu | e1a8000 | 2008-10-09 12:00:17 -0700 | [diff] [blame] | 1629 | rtnl_link_unregister(&ipgre_tap_ops); |
Herbert Xu | c19e654 | 2008-10-09 11:59:55 -0700 | [diff] [blame] | 1630 | rtnl_link_unregister(&ipgre_link_ops); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1631 | rtnl_link_unregister(&erspan_link_ops); |
Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 1632 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1633 | unregister_pernet_device(&ipgre_tap_net_ops); |
Alexey Dobriyan | c2892f0 | 2010-02-16 07:57:44 +0000 | [diff] [blame] | 1634 | unregister_pernet_device(&ipgre_net_ops); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1635 | unregister_pernet_device(&erspan_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | } |
| 1637 | |
| 1638 | module_init(ipgre_init); |
| 1639 | module_exit(ipgre_fini); |
| 1640 | MODULE_LICENSE("GPL"); |
Patrick McHardy | 4d74f8b | 2008-10-10 12:11:06 -0700 | [diff] [blame] | 1641 | MODULE_ALIAS_RTNL_LINK("gre"); |
| 1642 | MODULE_ALIAS_RTNL_LINK("gretap"); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1643 | MODULE_ALIAS_RTNL_LINK("erspan"); |
Vasiliy Kulikov | 8909c9a | 2011-03-02 00:33:13 +0300 | [diff] [blame] | 1644 | MODULE_ALIAS_NETDEV("gre0"); |
Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 1645 | MODULE_ALIAS_NETDEV("gretap0"); |
William Tu | 84e54fe | 2017-08-22 09:40:28 -0700 | [diff] [blame] | 1646 | MODULE_ALIAS_NETDEV("erspan0"); |