2 * Linux NET3: GRE over IP protocol decoder.
4 * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru)
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.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/if_vlan.h>
28 #include <linux/init.h>
29 #include <linux/in6.h>
30 #include <linux/inetdevice.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter_ipv4.h>
33 #include <linux/etherdevice.h>
34 #include <linux/if_ether.h>
39 #include <net/protocol.h>
40 #include <net/ip_tunnels.h>
42 #include <net/checksum.h>
43 #include <net/dsfield.h>
44 #include <net/inet_ecn.h>
46 #include <net/net_namespace.h>
47 #include <net/netns/generic.h>
48 #include <net/rtnetlink.h>
50 #include <net/dst_metadata.h>
51 #include <net/erspan.h>
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.
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),
65 and silently drop packet when it expires. It is a good
66 solution, but it supposes maintaining new variable in ALL
67 skb, even if no tunneling is used.
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
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:
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.
87 Hence, if we want that OSPF worked or traceroute said something reasonable,
88 we should search for another solution.
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,
92 taking into account fragmentation. TO be short, ttl is not solution at all.
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
99 rapidly degrades to value <68, where looping stops.
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. :-)
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");
114 static struct rtnl_link_ops ipgre_link_ops __read_mostly;
115 static int ipgre_tunnel_init(struct net_device *dev);
116 static void erspan_build_header(struct sk_buff *skb,
118 bool truncate, bool is_ipv4);
120 static unsigned int ipgre_net_id __read_mostly;
121 static unsigned int gre_tap_net_id __read_mostly;
122 static unsigned int erspan_net_id __read_mostly;
124 static void ipgre_err(struct sk_buff *skb, u32 info,
125 const struct tnl_ptk_info *tpi)
128 /* All the routers (except for Linux) return only
129 8 bytes of packet payload. It means, that precise relaying of
130 ICMP in the real Internet is absolutely infeasible.
132 Moreover, Cisco "wise men" put GRE key to the third word
133 in GRE header. It makes impossible maintaining even soft
134 state for keyed GRE tunnels with enabled checksum. Tell
137 Well, I wonder, rfc1812 was written by Cisco employee,
138 what the hell these idiots break standards established
141 struct net *net = dev_net(skb->dev);
142 struct ip_tunnel_net *itn;
143 const struct iphdr *iph;
144 const int type = icmp_hdr(skb)->type;
145 const int code = icmp_hdr(skb)->code;
146 unsigned int data_len = 0;
151 case ICMP_PARAMETERPROB:
154 case ICMP_DEST_UNREACH:
157 case ICMP_PORT_UNREACH:
158 /* Impossible event. */
161 /* All others are translated to HOST_UNREACH.
162 rfc2003 contains "deep thoughts" about NET_UNREACH,
163 I believe they are just ether pollution. --ANK
169 case ICMP_TIME_EXCEEDED:
170 if (code != ICMP_EXC_TTL)
172 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
179 if (tpi->proto == htons(ETH_P_TEB))
180 itn = net_generic(net, gre_tap_net_id);
182 itn = net_generic(net, ipgre_net_id);
184 iph = (const struct iphdr *)(icmp_hdr(skb) + 1);
185 t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
186 iph->daddr, iph->saddr, tpi->key);
191 #if IS_ENABLED(CONFIG_IPV6)
192 if (tpi->proto == htons(ETH_P_IPV6) &&
193 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len,
198 if (t->parms.iph.daddr == 0 ||
199 ipv4_is_multicast(t->parms.iph.daddr))
202 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
205 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
209 t->err_time = jiffies;
212 static void gre_err(struct sk_buff *skb, u32 info)
214 /* All the routers (except for Linux) return only
215 * 8 bytes of packet payload. It means, that precise relaying of
216 * ICMP in the real Internet is absolutely infeasible.
218 * Moreover, Cisco "wise men" put GRE key to the third word
219 * in GRE header. It makes impossible maintaining even soft
221 * GRE tunnels with enabled checksum. Tell them "thank you".
223 * Well, I wonder, rfc1812 was written by Cisco employee,
224 * what the hell these idiots break standards established
228 const struct iphdr *iph = (struct iphdr *)skb->data;
229 const int type = icmp_hdr(skb)->type;
230 const int code = icmp_hdr(skb)->code;
231 struct tnl_ptk_info tpi;
232 bool csum_err = false;
234 if (gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP),
236 if (!csum_err) /* ignore csum errors. */
240 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
241 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
242 skb->dev->ifindex, 0, IPPROTO_GRE, 0);
245 if (type == ICMP_REDIRECT) {
246 ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0,
251 ipgre_err(skb, info, &tpi);
254 static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
257 struct net *net = dev_net(skb->dev);
258 struct metadata_dst *tun_dst = NULL;
259 struct erspan_base_hdr *ershdr;
260 struct erspan_metadata *pkt_md;
261 struct ip_tunnel_net *itn;
262 struct ip_tunnel *tunnel;
263 const struct iphdr *iph;
264 struct erspan_md2 *md2;
268 itn = net_generic(net, erspan_net_id);
269 len = gre_hdr_len + sizeof(*ershdr);
271 /* Check based hdr len */
272 if (unlikely(!pskb_may_pull(skb, len)))
273 return PACKET_REJECT;
276 ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len);
279 /* The original GRE header does not have key field,
280 * Use ERSPAN 10-bit session ID as key.
282 tpi->key = cpu_to_be32(get_session_id(ershdr));
283 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex,
284 tpi->flags | TUNNEL_KEY,
285 iph->saddr, iph->daddr, tpi->key);
288 len = gre_hdr_len + erspan_hdr_len(ver);
289 if (unlikely(!pskb_may_pull(skb, len)))
290 return PACKET_REJECT;
292 ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len);
293 pkt_md = (struct erspan_metadata *)(ershdr + 1);
295 if (__iptunnel_pull_header(skb,
301 if (tunnel->collect_md) {
302 struct ip_tunnel_info *info;
303 struct erspan_metadata *md;
307 tpi->flags |= TUNNEL_KEY;
309 tun_id = key32_to_tunnel_id(tpi->key);
311 tun_dst = ip_tun_rx_dst(skb, flags,
312 tun_id, sizeof(*md));
314 return PACKET_REJECT;
316 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
319 memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
322 info = &tun_dst->u.tun_info;
323 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
324 info->options_len = sizeof(*md);
327 skb_reset_mac_header(skb);
328 ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
336 static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
337 struct ip_tunnel_net *itn, int hdr_len, bool raw_proto)
339 struct metadata_dst *tun_dst = NULL;
340 const struct iphdr *iph;
341 struct ip_tunnel *tunnel;
344 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
345 iph->saddr, iph->daddr, tpi->key);
348 if (__iptunnel_pull_header(skb, hdr_len, tpi->proto,
349 raw_proto, false) < 0)
352 if (tunnel->dev->type != ARPHRD_NONE)
353 skb_pop_mac_header(skb);
355 skb_reset_mac_header(skb);
356 if (tunnel->collect_md) {
360 flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY);
361 tun_id = key32_to_tunnel_id(tpi->key);
362 tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0);
364 return PACKET_REJECT;
367 ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
377 static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
380 struct net *net = dev_net(skb->dev);
381 struct ip_tunnel_net *itn;
384 if (tpi->proto == htons(ETH_P_TEB))
385 itn = net_generic(net, gre_tap_net_id);
387 itn = net_generic(net, ipgre_net_id);
389 res = __ipgre_rcv(skb, tpi, itn, hdr_len, false);
390 if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) {
391 /* ipgre tunnels in collect metadata mode should receive
392 * also ETH_P_TEB traffic.
394 itn = net_generic(net, ipgre_net_id);
395 res = __ipgre_rcv(skb, tpi, itn, hdr_len, true);
400 static int gre_rcv(struct sk_buff *skb)
402 struct tnl_ptk_info tpi;
403 bool csum_err = false;
406 #ifdef CONFIG_NET_IPGRE_BROADCAST
407 if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
408 /* Looped back packet, drop it! */
409 if (rt_is_output_route(skb_rtable(skb)))
414 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0);
418 if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
419 tpi.proto == htons(ETH_P_ERSPAN2))) {
420 if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
425 if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
429 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
435 static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
436 const struct iphdr *tnl_params,
439 struct ip_tunnel *tunnel = netdev_priv(dev);
441 if (tunnel->parms.o_flags & TUNNEL_SEQ)
444 /* Push GRE header. */
445 gre_build_header(skb, tunnel->tun_hlen,
446 tunnel->parms.o_flags, proto, tunnel->parms.o_key,
447 htonl(tunnel->o_seqno));
449 ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol);
452 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
454 return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
457 static struct rtable *gre_get_rt(struct sk_buff *skb,
458 struct net_device *dev,
460 const struct ip_tunnel_key *key)
462 struct net *net = dev_net(dev);
464 memset(fl, 0, sizeof(*fl));
465 fl->daddr = key->u.ipv4.dst;
466 fl->saddr = key->u.ipv4.src;
467 fl->flowi4_tos = RT_TOS(key->tos);
468 fl->flowi4_mark = skb->mark;
469 fl->flowi4_proto = IPPROTO_GRE;
471 return ip_route_output_key(net, fl);
474 static struct rtable *prepare_fb_xmit(struct sk_buff *skb,
475 struct net_device *dev,
479 struct ip_tunnel_info *tun_info;
480 const struct ip_tunnel_key *key;
481 struct rtable *rt = NULL;
486 tun_info = skb_tunnel_info(skb);
487 key = &tun_info->key;
488 use_cache = ip_tunnel_dst_cache_usable(skb, tun_info);
491 rt = dst_cache_get_ip4(&tun_info->dst_cache, &fl->saddr);
493 rt = gre_get_rt(skb, dev, fl, key);
497 dst_cache_set_ip4(&tun_info->dst_cache, &rt->dst,
501 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
502 + tunnel_hlen + sizeof(struct iphdr);
503 if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) {
504 int head_delta = SKB_DATA_ALIGN(min_headroom -
507 err = pskb_expand_head(skb, max_t(int, head_delta, 0),
518 dev->stats.tx_dropped++;
522 static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
525 struct ip_tunnel *tunnel = netdev_priv(dev);
526 struct ip_tunnel_info *tun_info;
527 const struct ip_tunnel_key *key;
528 struct rtable *rt = NULL;
533 tun_info = skb_tunnel_info(skb);
534 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
535 ip_tunnel_info_af(tun_info) != AF_INET))
538 key = &tun_info->key;
539 tunnel_hlen = gre_calc_hlen(key->tun_flags);
541 rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen);
545 /* Push Tunnel header. */
546 if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM)))
549 flags = tun_info->key.tun_flags &
550 (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
551 gre_build_header(skb, tunnel_hlen, flags, proto,
552 tunnel_id_to_key32(tun_info->key.tun_id),
553 (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0);
555 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
557 iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE,
558 key->tos, key->ttl, df, false);
565 dev->stats.tx_dropped++;
568 static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev,
571 struct ip_tunnel *tunnel = netdev_priv(dev);
572 struct ip_tunnel_info *tun_info;
573 const struct ip_tunnel_key *key;
574 struct erspan_metadata *md;
575 struct rtable *rt = NULL;
576 bool truncate = false;
582 tun_info = skb_tunnel_info(skb);
583 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
584 ip_tunnel_info_af(tun_info) != AF_INET))
587 key = &tun_info->key;
588 md = ip_tunnel_info_opts(tun_info);
592 /* ERSPAN has fixed 8 byte GRE header */
593 version = md->version;
594 tunnel_hlen = 8 + erspan_hdr_len(version);
596 rt = prepare_fb_xmit(skb, dev, &fl, tunnel_hlen);
600 if (gre_handle_offloads(skb, false))
603 if (skb->len > dev->mtu + dev->hard_header_len) {
604 pskb_trim(skb, dev->mtu + dev->hard_header_len);
609 erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)),
610 ntohl(md->u.index), truncate, true);
611 } else if (version == 2) {
612 erspan_build_header_v2(skb,
613 ntohl(tunnel_id_to_key32(key->tun_id)),
615 get_hwid(&md->u.md2),
621 gre_build_header(skb, 8, TUNNEL_SEQ,
622 htons(ETH_P_ERSPAN), 0, htonl(tunnel->o_seqno++));
624 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
626 iptunnel_xmit(skb->sk, rt, skb, fl.saddr, key->u.ipv4.dst, IPPROTO_GRE,
627 key->tos, key->ttl, df, false);
634 dev->stats.tx_dropped++;
637 static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
639 struct ip_tunnel_info *info = skb_tunnel_info(skb);
643 if (ip_tunnel_info_af(info) != AF_INET)
646 rt = gre_get_rt(skb, dev, &fl4, &info->key);
651 info->key.u.ipv4.src = fl4.saddr;
655 static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
656 struct net_device *dev)
658 struct ip_tunnel *tunnel = netdev_priv(dev);
659 const struct iphdr *tnl_params;
661 if (tunnel->collect_md) {
662 gre_fb_xmit(skb, dev, skb->protocol);
666 if (dev->header_ops) {
667 /* Need space for new headers */
668 if (skb_cow_head(skb, dev->needed_headroom -
669 (tunnel->hlen + sizeof(struct iphdr))))
672 tnl_params = (const struct iphdr *)skb->data;
674 /* Pull skb since ip_tunnel_xmit() needs skb->data pointing
677 skb_pull(skb, tunnel->hlen + sizeof(struct iphdr));
678 skb_reset_mac_header(skb);
680 if (skb_cow_head(skb, dev->needed_headroom))
683 tnl_params = &tunnel->parms.iph;
686 if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM)))
689 __gre_xmit(skb, dev, tnl_params, skb->protocol);
694 dev->stats.tx_dropped++;
698 static netdev_tx_t erspan_xmit(struct sk_buff *skb,
699 struct net_device *dev)
701 struct ip_tunnel *tunnel = netdev_priv(dev);
702 bool truncate = false;
704 if (tunnel->collect_md) {
705 erspan_fb_xmit(skb, dev, skb->protocol);
709 if (gre_handle_offloads(skb, false))
712 if (skb_cow_head(skb, dev->needed_headroom))
715 if (skb->len > dev->mtu + dev->hard_header_len) {
716 pskb_trim(skb, dev->mtu + dev->hard_header_len);
720 /* Push ERSPAN header */
721 if (tunnel->erspan_ver == 1)
722 erspan_build_header(skb, ntohl(tunnel->parms.o_key),
726 erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key),
727 tunnel->dir, tunnel->hwid,
730 tunnel->parms.o_flags &= ~TUNNEL_KEY;
731 __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_ERSPAN));
736 dev->stats.tx_dropped++;
740 static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
741 struct net_device *dev)
743 struct ip_tunnel *tunnel = netdev_priv(dev);
745 if (tunnel->collect_md) {
746 gre_fb_xmit(skb, dev, htons(ETH_P_TEB));
750 if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM)))
753 if (skb_cow_head(skb, dev->needed_headroom))
756 __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));
761 dev->stats.tx_dropped++;
765 static void ipgre_link_update(struct net_device *dev, bool set_mtu)
767 struct ip_tunnel *tunnel = netdev_priv(dev);
770 len = tunnel->tun_hlen;
771 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
772 len = tunnel->tun_hlen - len;
773 tunnel->hlen = tunnel->hlen + len;
775 dev->needed_headroom = dev->needed_headroom + len;
777 dev->mtu = max_t(int, dev->mtu - len, 68);
779 if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {
780 if (!(tunnel->parms.o_flags & TUNNEL_CSUM) ||
781 tunnel->encap.type == TUNNEL_ENCAP_NONE) {
782 dev->features |= NETIF_F_GSO_SOFTWARE;
783 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
785 dev->features &= ~NETIF_F_GSO_SOFTWARE;
786 dev->hw_features &= ~NETIF_F_GSO_SOFTWARE;
788 dev->features |= NETIF_F_LLTX;
790 dev->hw_features &= ~NETIF_F_GSO_SOFTWARE;
791 dev->features &= ~(NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE);
795 static int ipgre_tunnel_ioctl(struct net_device *dev,
796 struct ifreq *ifr, int cmd)
798 struct ip_tunnel_parm p;
801 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
804 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
805 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
806 p.iph.ihl != 5 || (p.iph.frag_off & htons(~IP_DF)) ||
807 ((p.i_flags | p.o_flags) & (GRE_VERSION | GRE_ROUTING)))
811 p.i_flags = gre_flags_to_tnl_flags(p.i_flags);
812 p.o_flags = gre_flags_to_tnl_flags(p.o_flags);
814 err = ip_tunnel_ioctl(dev, &p, cmd);
818 if (cmd == SIOCCHGTUNNEL) {
819 struct ip_tunnel *t = netdev_priv(dev);
821 t->parms.i_flags = p.i_flags;
822 t->parms.o_flags = p.o_flags;
824 if (strcmp(dev->rtnl_link_ops->kind, "erspan"))
825 ipgre_link_update(dev, true);
828 p.i_flags = gre_tnl_flags_to_gre_flags(p.i_flags);
829 p.o_flags = gre_tnl_flags_to_gre_flags(p.o_flags);
831 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
837 /* Nice toy. Unfortunately, useless in real life :-)
838 It allows to construct virtual multiprotocol broadcast "LAN"
839 over the Internet, provided multicast routing is tuned.
842 I have no idea was this bicycle invented before me,
843 so that I had to set ARPHRD_IPGRE to a random value.
844 I have an impression, that Cisco could make something similar,
845 but this feature is apparently missing in IOS<=11.2(8).
847 I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks
848 with broadcast 224.66.66.66. If you have access to mbone, play with me :-)
850 ping -t 255 224.66.66.66
852 If nobody answers, mbone does not work.
854 ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255
855 ip addr add 10.66.66.<somewhat>/24 dev Universe
857 ifconfig Universe add fe80::<Your_real_addr>/10
858 ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96
861 ftp fec0:6666:6666::193.233.7.65
864 static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
866 const void *daddr, const void *saddr, unsigned int len)
868 struct ip_tunnel *t = netdev_priv(dev);
870 struct gre_base_hdr *greh;
872 iph = skb_push(skb, t->hlen + sizeof(*iph));
873 greh = (struct gre_base_hdr *)(iph+1);
874 greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags);
875 greh->protocol = htons(type);
877 memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
879 /* Set the source hardware address. */
881 memcpy(&iph->saddr, saddr, 4);
883 memcpy(&iph->daddr, daddr, 4);
885 return t->hlen + sizeof(*iph);
887 return -(t->hlen + sizeof(*iph));
890 static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr)
892 const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb);
893 memcpy(haddr, &iph->saddr, 4);
897 static const struct header_ops ipgre_header_ops = {
898 .create = ipgre_header,
899 .parse = ipgre_header_parse,
902 #ifdef CONFIG_NET_IPGRE_BROADCAST
903 static int ipgre_open(struct net_device *dev)
905 struct ip_tunnel *t = netdev_priv(dev);
907 if (ipv4_is_multicast(t->parms.iph.daddr)) {
911 rt = ip_route_output_gre(t->net, &fl4,
915 RT_TOS(t->parms.iph.tos),
918 return -EADDRNOTAVAIL;
921 if (!__in_dev_get_rtnl(dev))
922 return -EADDRNOTAVAIL;
923 t->mlink = dev->ifindex;
924 ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr);
929 static int ipgre_close(struct net_device *dev)
931 struct ip_tunnel *t = netdev_priv(dev);
933 if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) {
934 struct in_device *in_dev;
935 in_dev = inetdev_by_index(t->net, t->mlink);
937 ip_mc_dec_group(in_dev, t->parms.iph.daddr);
943 static const struct net_device_ops ipgre_netdev_ops = {
944 .ndo_init = ipgre_tunnel_init,
945 .ndo_uninit = ip_tunnel_uninit,
946 #ifdef CONFIG_NET_IPGRE_BROADCAST
947 .ndo_open = ipgre_open,
948 .ndo_stop = ipgre_close,
950 .ndo_start_xmit = ipgre_xmit,
951 .ndo_do_ioctl = ipgre_tunnel_ioctl,
952 .ndo_change_mtu = ip_tunnel_change_mtu,
953 .ndo_get_stats64 = ip_tunnel_get_stats64,
954 .ndo_get_iflink = ip_tunnel_get_iflink,
957 #define GRE_FEATURES (NETIF_F_SG | \
962 static void ipgre_tunnel_setup(struct net_device *dev)
964 dev->netdev_ops = &ipgre_netdev_ops;
965 dev->type = ARPHRD_IPGRE;
966 ip_tunnel_setup(dev, ipgre_net_id);
969 static void __gre_tunnel_init(struct net_device *dev)
971 struct ip_tunnel *tunnel;
974 tunnel = netdev_priv(dev);
975 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
976 tunnel->parms.iph.protocol = IPPROTO_GRE;
978 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
980 t_hlen = tunnel->hlen + sizeof(struct iphdr);
982 dev->features |= GRE_FEATURES;
983 dev->hw_features |= GRE_FEATURES;
985 if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {
986 /* TCP offload with GRE SEQ is not supported, nor
987 * can we support 2 levels of outer headers requiring
990 if (!(tunnel->parms.o_flags & TUNNEL_CSUM) ||
991 (tunnel->encap.type == TUNNEL_ENCAP_NONE)) {
992 dev->features |= NETIF_F_GSO_SOFTWARE;
993 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
996 /* Can use a lockless transmit, unless we generate
999 dev->features |= NETIF_F_LLTX;
1003 static int ipgre_tunnel_init(struct net_device *dev)
1005 struct ip_tunnel *tunnel = netdev_priv(dev);
1006 struct iphdr *iph = &tunnel->parms.iph;
1008 __gre_tunnel_init(dev);
1010 memcpy(dev->dev_addr, &iph->saddr, 4);
1011 memcpy(dev->broadcast, &iph->daddr, 4);
1013 dev->flags = IFF_NOARP;
1014 netif_keep_dst(dev);
1017 if (iph->daddr && !tunnel->collect_md) {
1018 #ifdef CONFIG_NET_IPGRE_BROADCAST
1019 if (ipv4_is_multicast(iph->daddr)) {
1022 dev->flags = IFF_BROADCAST;
1023 dev->header_ops = &ipgre_header_ops;
1026 } else if (!tunnel->collect_md) {
1027 dev->header_ops = &ipgre_header_ops;
1030 return ip_tunnel_init(dev);
1033 static const struct gre_protocol ipgre_protocol = {
1035 .err_handler = gre_err,
1038 static int __net_init ipgre_init_net(struct net *net)
1040 return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL);
1043 static void __net_exit ipgre_exit_batch_net(struct list_head *list_net)
1045 ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops);
1048 static struct pernet_operations ipgre_net_ops = {
1049 .init = ipgre_init_net,
1050 .exit_batch = ipgre_exit_batch_net,
1051 .id = &ipgre_net_id,
1052 .size = sizeof(struct ip_tunnel_net),
1055 static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1056 struct netlink_ext_ack *extack)
1064 if (data[IFLA_GRE_IFLAGS])
1065 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1066 if (data[IFLA_GRE_OFLAGS])
1067 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1068 if (flags & (GRE_VERSION|GRE_ROUTING))
1071 if (data[IFLA_GRE_COLLECT_METADATA] &&
1072 data[IFLA_GRE_ENCAP_TYPE] &&
1073 nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE)
1079 static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1080 struct netlink_ext_ack *extack)
1084 if (tb[IFLA_ADDRESS]) {
1085 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1087 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1088 return -EADDRNOTAVAIL;
1094 if (data[IFLA_GRE_REMOTE]) {
1095 memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4);
1101 return ipgre_tunnel_validate(tb, data, extack);
1104 static int erspan_validate(struct nlattr *tb[], struct nlattr *data[],
1105 struct netlink_ext_ack *extack)
1113 ret = ipgre_tap_validate(tb, data, extack);
1117 /* ERSPAN should only have GRE sequence and key flag */
1118 if (data[IFLA_GRE_OFLAGS])
1119 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1120 if (data[IFLA_GRE_IFLAGS])
1121 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1122 if (!data[IFLA_GRE_COLLECT_METADATA] &&
1123 flags != (GRE_SEQ | GRE_KEY))
1126 /* ERSPAN Session ID only has 10-bit. Since we reuse
1127 * 32-bit key field as ID, check it's range.
1129 if (data[IFLA_GRE_IKEY] &&
1130 (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1133 if (data[IFLA_GRE_OKEY] &&
1134 (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1140 static int ipgre_netlink_parms(struct net_device *dev,
1141 struct nlattr *data[],
1142 struct nlattr *tb[],
1143 struct ip_tunnel_parm *parms,
1146 struct ip_tunnel *t = netdev_priv(dev);
1148 memset(parms, 0, sizeof(*parms));
1150 parms->iph.protocol = IPPROTO_GRE;
1155 if (data[IFLA_GRE_LINK])
1156 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1158 if (data[IFLA_GRE_IFLAGS])
1159 parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS]));
1161 if (data[IFLA_GRE_OFLAGS])
1162 parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS]));
1164 if (data[IFLA_GRE_IKEY])
1165 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1167 if (data[IFLA_GRE_OKEY])
1168 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1170 if (data[IFLA_GRE_LOCAL])
1171 parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]);
1173 if (data[IFLA_GRE_REMOTE])
1174 parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]);
1176 if (data[IFLA_GRE_TTL])
1177 parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]);
1179 if (data[IFLA_GRE_TOS])
1180 parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]);
1182 if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) {
1185 parms->iph.frag_off = htons(IP_DF);
1188 if (data[IFLA_GRE_COLLECT_METADATA]) {
1189 t->collect_md = true;
1190 if (dev->type == ARPHRD_IPGRE)
1191 dev->type = ARPHRD_NONE;
1194 if (data[IFLA_GRE_IGNORE_DF]) {
1195 if (nla_get_u8(data[IFLA_GRE_IGNORE_DF])
1196 && (parms->iph.frag_off & htons(IP_DF)))
1198 t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]);
1201 if (data[IFLA_GRE_FWMARK])
1202 *fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1204 if (data[IFLA_GRE_ERSPAN_VER]) {
1205 t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1207 if (t->erspan_ver != 1 && t->erspan_ver != 2)
1211 if (t->erspan_ver == 1) {
1212 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1213 t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1214 if (t->index & ~INDEX_MASK)
1217 } else if (t->erspan_ver == 2) {
1218 if (data[IFLA_GRE_ERSPAN_DIR]) {
1219 t->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1220 if (t->dir & ~(DIR_MASK >> DIR_OFFSET))
1223 if (data[IFLA_GRE_ERSPAN_HWID]) {
1224 t->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1225 if (t->hwid & ~(HWID_MASK >> HWID_OFFSET))
1233 /* This function returns true when ENCAP attributes are present in the nl msg */
1234 static bool ipgre_netlink_encap_parms(struct nlattr *data[],
1235 struct ip_tunnel_encap *ipencap)
1239 memset(ipencap, 0, sizeof(*ipencap));
1244 if (data[IFLA_GRE_ENCAP_TYPE]) {
1246 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1249 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1251 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1254 if (data[IFLA_GRE_ENCAP_SPORT]) {
1256 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1259 if (data[IFLA_GRE_ENCAP_DPORT]) {
1261 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1267 static int gre_tap_init(struct net_device *dev)
1269 __gre_tunnel_init(dev);
1270 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1271 netif_keep_dst(dev);
1273 return ip_tunnel_init(dev);
1276 static const struct net_device_ops gre_tap_netdev_ops = {
1277 .ndo_init = gre_tap_init,
1278 .ndo_uninit = ip_tunnel_uninit,
1279 .ndo_start_xmit = gre_tap_xmit,
1280 .ndo_set_mac_address = eth_mac_addr,
1281 .ndo_validate_addr = eth_validate_addr,
1282 .ndo_change_mtu = ip_tunnel_change_mtu,
1283 .ndo_get_stats64 = ip_tunnel_get_stats64,
1284 .ndo_get_iflink = ip_tunnel_get_iflink,
1285 .ndo_fill_metadata_dst = gre_fill_metadata_dst,
1288 static int erspan_tunnel_init(struct net_device *dev)
1290 struct ip_tunnel *tunnel = netdev_priv(dev);
1293 tunnel->tun_hlen = 8;
1294 tunnel->parms.iph.protocol = IPPROTO_GRE;
1295 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1296 erspan_hdr_len(tunnel->erspan_ver);
1297 t_hlen = tunnel->hlen + sizeof(struct iphdr);
1299 dev->features |= GRE_FEATURES;
1300 dev->hw_features |= GRE_FEATURES;
1301 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1302 netif_keep_dst(dev);
1304 return ip_tunnel_init(dev);
1307 static const struct net_device_ops erspan_netdev_ops = {
1308 .ndo_init = erspan_tunnel_init,
1309 .ndo_uninit = ip_tunnel_uninit,
1310 .ndo_start_xmit = erspan_xmit,
1311 .ndo_set_mac_address = eth_mac_addr,
1312 .ndo_validate_addr = eth_validate_addr,
1313 .ndo_change_mtu = ip_tunnel_change_mtu,
1314 .ndo_get_stats64 = ip_tunnel_get_stats64,
1315 .ndo_get_iflink = ip_tunnel_get_iflink,
1316 .ndo_fill_metadata_dst = gre_fill_metadata_dst,
1319 static void ipgre_tap_setup(struct net_device *dev)
1323 dev->netdev_ops = &gre_tap_netdev_ops;
1324 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1325 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1326 ip_tunnel_setup(dev, gre_tap_net_id);
1329 bool is_gretap_dev(const struct net_device *dev)
1331 return dev->netdev_ops == &gre_tap_netdev_ops;
1333 EXPORT_SYMBOL_GPL(is_gretap_dev);
1335 static int ipgre_newlink(struct net *src_net, struct net_device *dev,
1336 struct nlattr *tb[], struct nlattr *data[],
1337 struct netlink_ext_ack *extack)
1339 struct ip_tunnel_parm p;
1340 struct ip_tunnel_encap ipencap;
1344 if (ipgre_netlink_encap_parms(data, &ipencap)) {
1345 struct ip_tunnel *t = netdev_priv(dev);
1346 err = ip_tunnel_encap_setup(t, &ipencap);
1352 err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark);
1355 return ip_tunnel_newlink(dev, tb, &p, fwmark);
1358 static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
1359 struct nlattr *data[],
1360 struct netlink_ext_ack *extack)
1362 struct ip_tunnel *t = netdev_priv(dev);
1363 struct ip_tunnel_encap ipencap;
1364 __u32 fwmark = t->fwmark;
1365 struct ip_tunnel_parm p;
1368 if (ipgre_netlink_encap_parms(data, &ipencap)) {
1369 err = ip_tunnel_encap_setup(t, &ipencap);
1375 err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark);
1379 err = ip_tunnel_changelink(dev, tb, &p, fwmark);
1383 t->parms.i_flags = p.i_flags;
1384 t->parms.o_flags = p.o_flags;
1386 if (strcmp(dev->rtnl_link_ops->kind, "erspan"))
1387 ipgre_link_update(dev, !tb[IFLA_MTU]);
1392 static size_t ipgre_get_size(const struct net_device *dev)
1397 /* IFLA_GRE_IFLAGS */
1399 /* IFLA_GRE_OFLAGS */
1405 /* IFLA_GRE_LOCAL */
1407 /* IFLA_GRE_REMOTE */
1413 /* IFLA_GRE_PMTUDISC */
1415 /* IFLA_GRE_ENCAP_TYPE */
1417 /* IFLA_GRE_ENCAP_FLAGS */
1419 /* IFLA_GRE_ENCAP_SPORT */
1421 /* IFLA_GRE_ENCAP_DPORT */
1423 /* IFLA_GRE_COLLECT_METADATA */
1425 /* IFLA_GRE_IGNORE_DF */
1427 /* IFLA_GRE_FWMARK */
1429 /* IFLA_GRE_ERSPAN_INDEX */
1431 /* IFLA_GRE_ERSPAN_VER */
1433 /* IFLA_GRE_ERSPAN_DIR */
1435 /* IFLA_GRE_ERSPAN_HWID */
1440 static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1442 struct ip_tunnel *t = netdev_priv(dev);
1443 struct ip_tunnel_parm *p = &t->parms;
1445 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1446 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1447 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1448 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1449 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1450 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1451 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1452 nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) ||
1453 nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) ||
1454 nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) ||
1455 nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) ||
1456 nla_put_u8(skb, IFLA_GRE_PMTUDISC,
1457 !!(p->iph.frag_off & htons(IP_DF))) ||
1458 nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark))
1459 goto nla_put_failure;
1461 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1463 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1465 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1467 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1469 goto nla_put_failure;
1471 if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df))
1472 goto nla_put_failure;
1474 if (t->collect_md) {
1475 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
1476 goto nla_put_failure;
1479 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver))
1480 goto nla_put_failure;
1482 if (t->erspan_ver == 1) {
1483 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index))
1484 goto nla_put_failure;
1485 } else if (t->erspan_ver == 2) {
1486 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir))
1487 goto nla_put_failure;
1488 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid))
1489 goto nla_put_failure;
1498 static void erspan_setup(struct net_device *dev)
1501 dev->netdev_ops = &erspan_netdev_ops;
1502 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1503 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1504 ip_tunnel_setup(dev, erspan_net_id);
1507 static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = {
1508 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1509 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1510 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1511 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1512 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1513 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
1514 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1515 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1516 [IFLA_GRE_TOS] = { .type = NLA_U8 },
1517 [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
1518 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1519 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1520 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1521 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1522 [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
1523 [IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 },
1524 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
1525 [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
1526 [IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 },
1527 [IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 },
1528 [IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 },
1531 static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
1533 .maxtype = IFLA_GRE_MAX,
1534 .policy = ipgre_policy,
1535 .priv_size = sizeof(struct ip_tunnel),
1536 .setup = ipgre_tunnel_setup,
1537 .validate = ipgre_tunnel_validate,
1538 .newlink = ipgre_newlink,
1539 .changelink = ipgre_changelink,
1540 .dellink = ip_tunnel_dellink,
1541 .get_size = ipgre_get_size,
1542 .fill_info = ipgre_fill_info,
1543 .get_link_net = ip_tunnel_get_link_net,
1546 static struct rtnl_link_ops ipgre_tap_ops __read_mostly = {
1548 .maxtype = IFLA_GRE_MAX,
1549 .policy = ipgre_policy,
1550 .priv_size = sizeof(struct ip_tunnel),
1551 .setup = ipgre_tap_setup,
1552 .validate = ipgre_tap_validate,
1553 .newlink = ipgre_newlink,
1554 .changelink = ipgre_changelink,
1555 .dellink = ip_tunnel_dellink,
1556 .get_size = ipgre_get_size,
1557 .fill_info = ipgre_fill_info,
1558 .get_link_net = ip_tunnel_get_link_net,
1561 static struct rtnl_link_ops erspan_link_ops __read_mostly = {
1563 .maxtype = IFLA_GRE_MAX,
1564 .policy = ipgre_policy,
1565 .priv_size = sizeof(struct ip_tunnel),
1566 .setup = erspan_setup,
1567 .validate = erspan_validate,
1568 .newlink = ipgre_newlink,
1569 .changelink = ipgre_changelink,
1570 .dellink = ip_tunnel_dellink,
1571 .get_size = ipgre_get_size,
1572 .fill_info = ipgre_fill_info,
1573 .get_link_net = ip_tunnel_get_link_net,
1576 struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
1577 u8 name_assign_type)
1579 struct nlattr *tb[IFLA_MAX + 1];
1580 struct net_device *dev;
1581 LIST_HEAD(list_kill);
1582 struct ip_tunnel *t;
1585 memset(&tb, 0, sizeof(tb));
1587 dev = rtnl_create_link(net, name, name_assign_type,
1588 &ipgre_tap_ops, tb);
1592 /* Configure flow based GRE device. */
1593 t = netdev_priv(dev);
1594 t->collect_md = true;
1596 err = ipgre_newlink(net, dev, tb, NULL, NULL);
1599 return ERR_PTR(err);
1602 /* openvswitch users expect packet sizes to be unrestricted,
1603 * so set the largest MTU we can.
1605 err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false);
1609 err = rtnl_configure_link(dev, NULL);
1615 ip_tunnel_dellink(dev, &list_kill);
1616 unregister_netdevice_many(&list_kill);
1617 return ERR_PTR(err);
1619 EXPORT_SYMBOL_GPL(gretap_fb_dev_create);
1621 static int __net_init ipgre_tap_init_net(struct net *net)
1623 return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0");
1626 static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net)
1628 ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops);
1631 static struct pernet_operations ipgre_tap_net_ops = {
1632 .init = ipgre_tap_init_net,
1633 .exit_batch = ipgre_tap_exit_batch_net,
1634 .id = &gre_tap_net_id,
1635 .size = sizeof(struct ip_tunnel_net),
1638 static int __net_init erspan_init_net(struct net *net)
1640 return ip_tunnel_init_net(net, erspan_net_id,
1641 &erspan_link_ops, "erspan0");
1644 static void __net_exit erspan_exit_batch_net(struct list_head *net_list)
1646 ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops);
1649 static struct pernet_operations erspan_net_ops = {
1650 .init = erspan_init_net,
1651 .exit_batch = erspan_exit_batch_net,
1652 .id = &erspan_net_id,
1653 .size = sizeof(struct ip_tunnel_net),
1656 static int __init ipgre_init(void)
1660 pr_info("GRE over IPv4 tunneling driver\n");
1662 err = register_pernet_device(&ipgre_net_ops);
1666 err = register_pernet_device(&ipgre_tap_net_ops);
1668 goto pnet_tap_failed;
1670 err = register_pernet_device(&erspan_net_ops);
1672 goto pnet_erspan_failed;
1674 err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
1676 pr_info("%s: can't add protocol\n", __func__);
1677 goto add_proto_failed;
1680 err = rtnl_link_register(&ipgre_link_ops);
1682 goto rtnl_link_failed;
1684 err = rtnl_link_register(&ipgre_tap_ops);
1686 goto tap_ops_failed;
1688 err = rtnl_link_register(&erspan_link_ops);
1690 goto erspan_link_failed;
1695 rtnl_link_unregister(&ipgre_tap_ops);
1697 rtnl_link_unregister(&ipgre_link_ops);
1699 gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
1701 unregister_pernet_device(&erspan_net_ops);
1703 unregister_pernet_device(&ipgre_tap_net_ops);
1705 unregister_pernet_device(&ipgre_net_ops);
1709 static void __exit ipgre_fini(void)
1711 rtnl_link_unregister(&ipgre_tap_ops);
1712 rtnl_link_unregister(&ipgre_link_ops);
1713 rtnl_link_unregister(&erspan_link_ops);
1714 gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
1715 unregister_pernet_device(&ipgre_tap_net_ops);
1716 unregister_pernet_device(&ipgre_net_ops);
1717 unregister_pernet_device(&erspan_net_ops);
1720 module_init(ipgre_init);
1721 module_exit(ipgre_fini);
1722 MODULE_LICENSE("GPL");
1723 MODULE_ALIAS_RTNL_LINK("gre");
1724 MODULE_ALIAS_RTNL_LINK("gretap");
1725 MODULE_ALIAS_RTNL_LINK("erspan");
1726 MODULE_ALIAS_NETDEV("gre0");
1727 MODULE_ALIAS_NETDEV("gretap0");
1728 MODULE_ALIAS_NETDEV("erspan0");