1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Linux NET3: GRE over IP protocol decoder.
5 * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru)
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/capability.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/uaccess.h>
16 #include <linux/skbuff.h>
17 #include <linux/netdevice.h>
19 #include <linux/tcp.h>
20 #include <linux/udp.h>
21 #include <linux/if_arp.h>
22 #include <linux/if_vlan.h>
23 #include <linux/init.h>
24 #include <linux/in6.h>
25 #include <linux/inetdevice.h>
26 #include <linux/igmp.h>
27 #include <linux/netfilter_ipv4.h>
28 #include <linux/etherdevice.h>
29 #include <linux/if_ether.h>
34 #include <net/protocol.h>
35 #include <net/ip_tunnels.h>
37 #include <net/checksum.h>
38 #include <net/dsfield.h>
39 #include <net/inet_ecn.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <net/rtnetlink.h>
45 #include <net/dst_metadata.h>
46 #include <net/erspan.h>
52 1. The most important issue is detecting local dead loops.
53 They would cause complete host lockup in transmit, which
54 would be "resolved" by stack overflow or, if queueing is enabled,
55 with infinite looping in net_bh.
57 We cannot track such dead loops during route installation,
58 it is infeasible task. The most general solutions would be
59 to keep skb->encapsulation counter (sort of local ttl),
60 and silently drop packet when it expires. It is a good
61 solution, but it supposes maintaining new variable in ALL
62 skb, even if no tunneling is used.
64 Current solution: xmit_recursion breaks dead loops. This is a percpu
65 counter, since when we enter the first ndo_xmit(), cpu migration is
66 forbidden. We force an exit if this counter reaches RECURSION_LIMIT
68 2. Networking dead loops would not kill routers, but would really
69 kill network. IP hop limit plays role of "t->recursion" in this case,
70 if we copy it from packet being encapsulated to upper header.
71 It is very good solution, but it introduces two problems:
73 - Routing protocols, using packets with ttl=1 (OSPF, RIP2),
74 do not work over tunnels.
75 - traceroute does not work. I planned to relay ICMP from tunnel,
76 so that this problem would be solved and traceroute output
77 would even more informative. This idea appeared to be wrong:
78 only Linux complies to rfc1812 now (yes, guys, Linux is the only
79 true router now :-)), all routers (at least, in neighbourhood of mine)
80 return only 8 bytes of payload. It is the end.
82 Hence, if we want that OSPF worked or traceroute said something reasonable,
83 we should search for another solution.
85 One of them is to parse packet trying to detect inner encapsulation
86 made by our node. It is difficult or even impossible, especially,
87 taking into account fragmentation. TO be short, ttl is not solution at all.
89 Current solution: The solution was UNEXPECTEDLY SIMPLE.
90 We force DF flag on tunnels with preconfigured hop limit,
91 that is ALL. :-) Well, it does not remove the problem completely,
92 but exponential growth of network traffic is changed to linear
93 (branches, that exceed pmtu are pruned) and tunnel mtu
94 rapidly degrades to value <68, where looping stops.
95 Yes, it is not good if there exists a router in the loop,
96 which does not force DF, even when encapsulating packets have DF set.
97 But it is not our problem! Nobody could accuse us, we made
98 all that we could make. Even if it is your gated who injected
99 fatal route to network, even if it were you who configured
100 fatal static route: you are innocent. :-)
105 static bool log_ecn_error
= true;
106 module_param(log_ecn_error
, bool, 0644);
107 MODULE_PARM_DESC(log_ecn_error
, "Log packets received with corrupted ECN");
109 static struct rtnl_link_ops ipgre_link_ops __read_mostly
;
110 static int ipgre_tunnel_init(struct net_device
*dev
);
111 static void erspan_build_header(struct sk_buff
*skb
,
113 bool truncate
, bool is_ipv4
);
115 static unsigned int ipgre_net_id __read_mostly
;
116 static unsigned int gre_tap_net_id __read_mostly
;
117 static unsigned int erspan_net_id __read_mostly
;
119 static int ipgre_err(struct sk_buff
*skb
, u32 info
,
120 const struct tnl_ptk_info
*tpi
)
123 /* All the routers (except for Linux) return only
124 8 bytes of packet payload. It means, that precise relaying of
125 ICMP in the real Internet is absolutely infeasible.
127 Moreover, Cisco "wise men" put GRE key to the third word
128 in GRE header. It makes impossible maintaining even soft
129 state for keyed GRE tunnels with enabled checksum. Tell
132 Well, I wonder, rfc1812 was written by Cisco employee,
133 what the hell these idiots break standards established
136 struct net
*net
= dev_net(skb
->dev
);
137 struct ip_tunnel_net
*itn
;
138 const struct iphdr
*iph
;
139 const int type
= icmp_hdr(skb
)->type
;
140 const int code
= icmp_hdr(skb
)->code
;
141 unsigned int data_len
= 0;
144 if (tpi
->proto
== htons(ETH_P_TEB
))
145 itn
= net_generic(net
, gre_tap_net_id
);
146 else if (tpi
->proto
== htons(ETH_P_ERSPAN
) ||
147 tpi
->proto
== htons(ETH_P_ERSPAN2
))
148 itn
= net_generic(net
, erspan_net_id
);
150 itn
= net_generic(net
, ipgre_net_id
);
152 iph
= (const struct iphdr
*)(icmp_hdr(skb
) + 1);
153 t
= ip_tunnel_lookup(itn
, skb
->dev
->ifindex
, tpi
->flags
,
154 iph
->daddr
, iph
->saddr
, tpi
->key
);
161 case ICMP_PARAMETERPROB
:
164 case ICMP_DEST_UNREACH
:
167 case ICMP_PORT_UNREACH
:
168 /* Impossible event. */
171 /* All others are translated to HOST_UNREACH.
172 rfc2003 contains "deep thoughts" about NET_UNREACH,
173 I believe they are just ether pollution. --ANK
179 case ICMP_TIME_EXCEEDED
:
180 if (code
!= ICMP_EXC_TTL
)
182 data_len
= icmp_hdr(skb
)->un
.reserved
[1] * 4; /* RFC 4884 4.1 */
189 #if IS_ENABLED(CONFIG_IPV6)
190 if (tpi
->proto
== htons(ETH_P_IPV6
) &&
191 !ip6_err_gen_icmpv6_unreach(skb
, iph
->ihl
* 4 + tpi
->hdr_len
,
196 if (t
->parms
.iph
.daddr
== 0 ||
197 ipv4_is_multicast(t
->parms
.iph
.daddr
))
200 if (t
->parms
.iph
.ttl
== 0 && type
== ICMP_TIME_EXCEEDED
)
203 if (time_before(jiffies
, t
->err_time
+ IPTUNNEL_ERR_TIMEO
))
207 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
;
233 if (gre_parse_header(skb
, &tpi
, NULL
, htons(ETH_P_IP
),
237 if (type
== ICMP_DEST_UNREACH
&& code
== ICMP_FRAG_NEEDED
) {
238 ipv4_update_pmtu(skb
, dev_net(skb
->dev
), info
,
239 skb
->dev
->ifindex
, IPPROTO_GRE
);
242 if (type
== ICMP_REDIRECT
) {
243 ipv4_redirect(skb
, dev_net(skb
->dev
), skb
->dev
->ifindex
,
248 ipgre_err(skb
, info
, &tpi
);
251 static int erspan_rcv(struct sk_buff
*skb
, struct tnl_ptk_info
*tpi
,
254 struct net
*net
= dev_net(skb
->dev
);
255 struct metadata_dst
*tun_dst
= NULL
;
256 struct erspan_base_hdr
*ershdr
;
257 struct ip_tunnel_net
*itn
;
258 struct ip_tunnel
*tunnel
;
259 const struct iphdr
*iph
;
260 struct erspan_md2
*md2
;
264 itn
= net_generic(net
, erspan_net_id
);
267 ershdr
= (struct erspan_base_hdr
*)(skb
->data
+ gre_hdr_len
);
270 tunnel
= ip_tunnel_lookup(itn
, skb
->dev
->ifindex
,
271 tpi
->flags
| TUNNEL_KEY
,
272 iph
->saddr
, iph
->daddr
, tpi
->key
);
275 len
= gre_hdr_len
+ erspan_hdr_len(ver
);
276 if (unlikely(!pskb_may_pull(skb
, len
)))
277 return PACKET_REJECT
;
279 if (__iptunnel_pull_header(skb
,
285 if (tunnel
->collect_md
) {
286 struct erspan_metadata
*pkt_md
, *md
;
287 struct ip_tunnel_info
*info
;
292 tpi
->flags
|= TUNNEL_KEY
;
294 tun_id
= key32_to_tunnel_id(tpi
->key
);
296 tun_dst
= ip_tun_rx_dst(skb
, flags
,
297 tun_id
, sizeof(*md
));
299 return PACKET_REJECT
;
301 /* skb can be uncloned in __iptunnel_pull_header, so
302 * old pkt_md is no longer valid and we need to reset
305 gh
= skb_network_header(skb
) +
306 skb_network_header_len(skb
);
307 pkt_md
= (struct erspan_metadata
*)(gh
+ gre_hdr_len
+
309 md
= ip_tunnel_info_opts(&tun_dst
->u
.tun_info
);
312 memcpy(md2
, pkt_md
, ver
== 1 ? ERSPAN_V1_MDSIZE
:
315 info
= &tun_dst
->u
.tun_info
;
316 info
->key
.tun_flags
|= TUNNEL_ERSPAN_OPT
;
317 info
->options_len
= sizeof(*md
);
320 skb_reset_mac_header(skb
);
321 ip_tunnel_rcv(tunnel
, skb
, tpi
, tun_dst
, log_ecn_error
);
324 return PACKET_REJECT
;
331 static int __ipgre_rcv(struct sk_buff
*skb
, const struct tnl_ptk_info
*tpi
,
332 struct ip_tunnel_net
*itn
, int hdr_len
, bool raw_proto
)
334 struct metadata_dst
*tun_dst
= NULL
;
335 const struct iphdr
*iph
;
336 struct ip_tunnel
*tunnel
;
339 tunnel
= ip_tunnel_lookup(itn
, skb
->dev
->ifindex
, tpi
->flags
,
340 iph
->saddr
, iph
->daddr
, tpi
->key
);
343 const struct iphdr
*tnl_params
;
345 if (__iptunnel_pull_header(skb
, hdr_len
, tpi
->proto
,
346 raw_proto
, false) < 0)
349 if (tunnel
->dev
->type
!= ARPHRD_NONE
)
350 skb_pop_mac_header(skb
);
352 skb_reset_mac_header(skb
);
354 tnl_params
= &tunnel
->parms
.iph
;
355 if (tunnel
->collect_md
|| tnl_params
->daddr
== 0) {
359 flags
= tpi
->flags
& (TUNNEL_CSUM
| TUNNEL_KEY
);
360 tun_id
= key32_to_tunnel_id(tpi
->key
);
361 tun_dst
= ip_tun_rx_dst(skb
, flags
, tun_id
, 0);
363 return PACKET_REJECT
;
366 ip_tunnel_rcv(tunnel
, skb
, tpi
, tun_dst
, log_ecn_error
);
376 static int ipgre_rcv(struct sk_buff
*skb
, const struct tnl_ptk_info
*tpi
,
379 struct net
*net
= dev_net(skb
->dev
);
380 struct ip_tunnel_net
*itn
;
383 if (tpi
->proto
== htons(ETH_P_TEB
))
384 itn
= net_generic(net
, gre_tap_net_id
);
386 itn
= net_generic(net
, ipgre_net_id
);
388 res
= __ipgre_rcv(skb
, tpi
, itn
, hdr_len
, false);
389 if (res
== PACKET_NEXT
&& tpi
->proto
== htons(ETH_P_TEB
)) {
390 /* ipgre tunnels in collect metadata mode should receive
391 * also ETH_P_TEB traffic.
393 itn
= net_generic(net
, ipgre_net_id
);
394 res
= __ipgre_rcv(skb
, tpi
, itn
, hdr_len
, true);
399 static int gre_rcv(struct sk_buff
*skb
)
401 struct tnl_ptk_info tpi
;
402 bool csum_err
= false;
405 #ifdef CONFIG_NET_IPGRE_BROADCAST
406 if (ipv4_is_multicast(ip_hdr(skb
)->daddr
)) {
407 /* Looped back packet, drop it! */
408 if (rt_is_output_route(skb_rtable(skb
)))
413 hdr_len
= gre_parse_header(skb
, &tpi
, &csum_err
, htons(ETH_P_IP
), 0);
417 if (unlikely(tpi
.proto
== htons(ETH_P_ERSPAN
) ||
418 tpi
.proto
== htons(ETH_P_ERSPAN2
))) {
419 if (erspan_rcv(skb
, &tpi
, hdr_len
) == PACKET_RCVD
)
424 if (ipgre_rcv(skb
, &tpi
, hdr_len
) == PACKET_RCVD
)
428 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
434 static void __gre_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
435 const struct iphdr
*tnl_params
,
438 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
440 if (tunnel
->parms
.o_flags
& TUNNEL_SEQ
)
443 /* Push GRE header. */
444 gre_build_header(skb
, tunnel
->tun_hlen
,
445 tunnel
->parms
.o_flags
, proto
, tunnel
->parms
.o_key
,
446 htonl(tunnel
->o_seqno
));
448 ip_tunnel_xmit(skb
, dev
, tnl_params
, tnl_params
->protocol
);
451 static int gre_handle_offloads(struct sk_buff
*skb
, bool csum
)
453 return iptunnel_handle_offloads(skb
, csum
? SKB_GSO_GRE_CSUM
: SKB_GSO_GRE
);
456 static void gre_fb_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
459 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
460 struct ip_tunnel_info
*tun_info
;
461 const struct ip_tunnel_key
*key
;
465 tun_info
= skb_tunnel_info(skb
);
466 if (unlikely(!tun_info
|| !(tun_info
->mode
& IP_TUNNEL_INFO_TX
) ||
467 ip_tunnel_info_af(tun_info
) != AF_INET
))
470 key
= &tun_info
->key
;
471 tunnel_hlen
= gre_calc_hlen(key
->tun_flags
);
473 if (skb_cow_head(skb
, dev
->needed_headroom
))
476 /* Push Tunnel header. */
477 if (gre_handle_offloads(skb
, !!(tun_info
->key
.tun_flags
& TUNNEL_CSUM
)))
480 flags
= tun_info
->key
.tun_flags
&
481 (TUNNEL_CSUM
| TUNNEL_KEY
| TUNNEL_SEQ
);
482 gre_build_header(skb
, tunnel_hlen
, flags
, proto
,
483 tunnel_id_to_key32(tun_info
->key
.tun_id
),
484 (flags
& TUNNEL_SEQ
) ? htonl(tunnel
->o_seqno
++) : 0);
486 ip_md_tunnel_xmit(skb
, dev
, IPPROTO_GRE
, tunnel_hlen
);
492 dev
->stats
.tx_dropped
++;
495 static void erspan_fb_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
497 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
498 struct ip_tunnel_info
*tun_info
;
499 const struct ip_tunnel_key
*key
;
500 struct erspan_metadata
*md
;
501 bool truncate
= false;
508 tun_info
= skb_tunnel_info(skb
);
509 if (unlikely(!tun_info
|| !(tun_info
->mode
& IP_TUNNEL_INFO_TX
) ||
510 ip_tunnel_info_af(tun_info
) != AF_INET
))
513 key
= &tun_info
->key
;
514 if (!(tun_info
->key
.tun_flags
& TUNNEL_ERSPAN_OPT
))
516 if (tun_info
->options_len
< sizeof(*md
))
518 md
= ip_tunnel_info_opts(tun_info
);
520 /* ERSPAN has fixed 8 byte GRE header */
521 version
= md
->version
;
522 tunnel_hlen
= 8 + erspan_hdr_len(version
);
524 if (skb_cow_head(skb
, dev
->needed_headroom
))
527 if (gre_handle_offloads(skb
, false))
530 if (skb
->len
> dev
->mtu
+ dev
->hard_header_len
) {
531 pskb_trim(skb
, dev
->mtu
+ dev
->hard_header_len
);
535 nhoff
= skb_network_header(skb
) - skb_mac_header(skb
);
536 if (skb
->protocol
== htons(ETH_P_IP
) &&
537 (ntohs(ip_hdr(skb
)->tot_len
) > skb
->len
- nhoff
))
540 thoff
= skb_transport_header(skb
) - skb_mac_header(skb
);
541 if (skb
->protocol
== htons(ETH_P_IPV6
) &&
542 (ntohs(ipv6_hdr(skb
)->payload_len
) > skb
->len
- thoff
))
546 erspan_build_header(skb
, ntohl(tunnel_id_to_key32(key
->tun_id
)),
547 ntohl(md
->u
.index
), truncate
, true);
548 proto
= htons(ETH_P_ERSPAN
);
549 } else if (version
== 2) {
550 erspan_build_header_v2(skb
,
551 ntohl(tunnel_id_to_key32(key
->tun_id
)),
553 get_hwid(&md
->u
.md2
),
555 proto
= htons(ETH_P_ERSPAN2
);
560 gre_build_header(skb
, 8, TUNNEL_SEQ
,
561 proto
, 0, htonl(tunnel
->o_seqno
++));
563 ip_md_tunnel_xmit(skb
, dev
, IPPROTO_GRE
, tunnel_hlen
);
569 dev
->stats
.tx_dropped
++;
572 static int gre_fill_metadata_dst(struct net_device
*dev
, struct sk_buff
*skb
)
574 struct ip_tunnel_info
*info
= skb_tunnel_info(skb
);
575 const struct ip_tunnel_key
*key
;
579 if (ip_tunnel_info_af(info
) != AF_INET
)
583 ip_tunnel_init_flow(&fl4
, IPPROTO_GRE
, key
->u
.ipv4
.dst
, key
->u
.ipv4
.src
,
584 tunnel_id_to_key32(key
->tun_id
), key
->tos
, 0,
585 skb
->mark
, skb_get_hash(skb
));
586 rt
= ip_route_output_key(dev_net(dev
), &fl4
);
591 info
->key
.u
.ipv4
.src
= fl4
.saddr
;
595 static netdev_tx_t
ipgre_xmit(struct sk_buff
*skb
,
596 struct net_device
*dev
)
598 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
599 const struct iphdr
*tnl_params
;
601 if (!pskb_inet_may_pull(skb
))
604 if (tunnel
->collect_md
) {
605 gre_fb_xmit(skb
, dev
, skb
->protocol
);
609 if (dev
->header_ops
) {
610 /* Need space for new headers */
611 if (skb_cow_head(skb
, dev
->needed_headroom
-
612 (tunnel
->hlen
+ sizeof(struct iphdr
))))
615 tnl_params
= (const struct iphdr
*)skb
->data
;
617 /* Pull skb since ip_tunnel_xmit() needs skb->data pointing
620 skb_pull(skb
, tunnel
->hlen
+ sizeof(struct iphdr
));
621 skb_reset_mac_header(skb
);
623 if (skb_cow_head(skb
, dev
->needed_headroom
))
626 tnl_params
= &tunnel
->parms
.iph
;
629 if (gre_handle_offloads(skb
, !!(tunnel
->parms
.o_flags
& TUNNEL_CSUM
)))
632 __gre_xmit(skb
, dev
, tnl_params
, skb
->protocol
);
637 dev
->stats
.tx_dropped
++;
641 static netdev_tx_t
erspan_xmit(struct sk_buff
*skb
,
642 struct net_device
*dev
)
644 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
645 bool truncate
= false;
648 if (!pskb_inet_may_pull(skb
))
651 if (tunnel
->collect_md
) {
652 erspan_fb_xmit(skb
, dev
);
656 if (gre_handle_offloads(skb
, false))
659 if (skb_cow_head(skb
, dev
->needed_headroom
))
662 if (skb
->len
> dev
->mtu
+ dev
->hard_header_len
) {
663 pskb_trim(skb
, dev
->mtu
+ dev
->hard_header_len
);
667 /* Push ERSPAN header */
668 if (tunnel
->erspan_ver
== 1) {
669 erspan_build_header(skb
, ntohl(tunnel
->parms
.o_key
),
672 proto
= htons(ETH_P_ERSPAN
);
673 } else if (tunnel
->erspan_ver
== 2) {
674 erspan_build_header_v2(skb
, ntohl(tunnel
->parms
.o_key
),
675 tunnel
->dir
, tunnel
->hwid
,
677 proto
= htons(ETH_P_ERSPAN2
);
682 tunnel
->parms
.o_flags
&= ~TUNNEL_KEY
;
683 __gre_xmit(skb
, dev
, &tunnel
->parms
.iph
, proto
);
688 dev
->stats
.tx_dropped
++;
692 static netdev_tx_t
gre_tap_xmit(struct sk_buff
*skb
,
693 struct net_device
*dev
)
695 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
697 if (!pskb_inet_may_pull(skb
))
700 if (tunnel
->collect_md
) {
701 gre_fb_xmit(skb
, dev
, htons(ETH_P_TEB
));
705 if (gre_handle_offloads(skb
, !!(tunnel
->parms
.o_flags
& TUNNEL_CSUM
)))
708 if (skb_cow_head(skb
, dev
->needed_headroom
))
711 __gre_xmit(skb
, dev
, &tunnel
->parms
.iph
, htons(ETH_P_TEB
));
716 dev
->stats
.tx_dropped
++;
720 static void ipgre_link_update(struct net_device
*dev
, bool set_mtu
)
722 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
725 len
= tunnel
->tun_hlen
;
726 tunnel
->tun_hlen
= gre_calc_hlen(tunnel
->parms
.o_flags
);
727 len
= tunnel
->tun_hlen
- len
;
728 tunnel
->hlen
= tunnel
->hlen
+ len
;
730 dev
->needed_headroom
= dev
->needed_headroom
+ len
;
732 dev
->mtu
= max_t(int, dev
->mtu
- len
, 68);
734 if (!(tunnel
->parms
.o_flags
& TUNNEL_SEQ
)) {
735 if (!(tunnel
->parms
.o_flags
& TUNNEL_CSUM
) ||
736 tunnel
->encap
.type
== TUNNEL_ENCAP_NONE
) {
737 dev
->features
|= NETIF_F_GSO_SOFTWARE
;
738 dev
->hw_features
|= NETIF_F_GSO_SOFTWARE
;
740 dev
->features
&= ~NETIF_F_GSO_SOFTWARE
;
741 dev
->hw_features
&= ~NETIF_F_GSO_SOFTWARE
;
743 dev
->features
|= NETIF_F_LLTX
;
745 dev
->hw_features
&= ~NETIF_F_GSO_SOFTWARE
;
746 dev
->features
&= ~(NETIF_F_LLTX
| NETIF_F_GSO_SOFTWARE
);
750 static int ipgre_tunnel_ioctl(struct net_device
*dev
,
751 struct ifreq
*ifr
, int cmd
)
753 struct ip_tunnel_parm p
;
756 if (copy_from_user(&p
, ifr
->ifr_ifru
.ifru_data
, sizeof(p
)))
759 if (cmd
== SIOCADDTUNNEL
|| cmd
== SIOCCHGTUNNEL
) {
760 if (p
.iph
.version
!= 4 || p
.iph
.protocol
!= IPPROTO_GRE
||
761 p
.iph
.ihl
!= 5 || (p
.iph
.frag_off
& htons(~IP_DF
)) ||
762 ((p
.i_flags
| p
.o_flags
) & (GRE_VERSION
| GRE_ROUTING
)))
766 p
.i_flags
= gre_flags_to_tnl_flags(p
.i_flags
);
767 p
.o_flags
= gre_flags_to_tnl_flags(p
.o_flags
);
769 err
= ip_tunnel_ioctl(dev
, &p
, cmd
);
773 if (cmd
== SIOCCHGTUNNEL
) {
774 struct ip_tunnel
*t
= netdev_priv(dev
);
776 t
->parms
.i_flags
= p
.i_flags
;
777 t
->parms
.o_flags
= p
.o_flags
;
779 if (strcmp(dev
->rtnl_link_ops
->kind
, "erspan"))
780 ipgre_link_update(dev
, true);
783 p
.i_flags
= gre_tnl_flags_to_gre_flags(p
.i_flags
);
784 p
.o_flags
= gre_tnl_flags_to_gre_flags(p
.o_flags
);
786 if (copy_to_user(ifr
->ifr_ifru
.ifru_data
, &p
, sizeof(p
)))
792 /* Nice toy. Unfortunately, useless in real life :-)
793 It allows to construct virtual multiprotocol broadcast "LAN"
794 over the Internet, provided multicast routing is tuned.
797 I have no idea was this bicycle invented before me,
798 so that I had to set ARPHRD_IPGRE to a random value.
799 I have an impression, that Cisco could make something similar,
800 but this feature is apparently missing in IOS<=11.2(8).
802 I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks
803 with broadcast 224.66.66.66. If you have access to mbone, play with me :-)
805 ping -t 255 224.66.66.66
807 If nobody answers, mbone does not work.
809 ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255
810 ip addr add 10.66.66.<somewhat>/24 dev Universe
812 ifconfig Universe add fe80::<Your_real_addr>/10
813 ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96
816 ftp fec0:6666:6666::193.233.7.65
819 static int ipgre_header(struct sk_buff
*skb
, struct net_device
*dev
,
821 const void *daddr
, const void *saddr
, unsigned int len
)
823 struct ip_tunnel
*t
= netdev_priv(dev
);
825 struct gre_base_hdr
*greh
;
827 iph
= skb_push(skb
, t
->hlen
+ sizeof(*iph
));
828 greh
= (struct gre_base_hdr
*)(iph
+1);
829 greh
->flags
= gre_tnl_flags_to_gre_flags(t
->parms
.o_flags
);
830 greh
->protocol
= htons(type
);
832 memcpy(iph
, &t
->parms
.iph
, sizeof(struct iphdr
));
834 /* Set the source hardware address. */
836 memcpy(&iph
->saddr
, saddr
, 4);
838 memcpy(&iph
->daddr
, daddr
, 4);
840 return t
->hlen
+ sizeof(*iph
);
842 return -(t
->hlen
+ sizeof(*iph
));
845 static int ipgre_header_parse(const struct sk_buff
*skb
, unsigned char *haddr
)
847 const struct iphdr
*iph
= (const struct iphdr
*) skb_mac_header(skb
);
848 memcpy(haddr
, &iph
->saddr
, 4);
852 static const struct header_ops ipgre_header_ops
= {
853 .create
= ipgre_header
,
854 .parse
= ipgre_header_parse
,
857 #ifdef CONFIG_NET_IPGRE_BROADCAST
858 static int ipgre_open(struct net_device
*dev
)
860 struct ip_tunnel
*t
= netdev_priv(dev
);
862 if (ipv4_is_multicast(t
->parms
.iph
.daddr
)) {
866 rt
= ip_route_output_gre(t
->net
, &fl4
,
870 RT_TOS(t
->parms
.iph
.tos
),
873 return -EADDRNOTAVAIL
;
876 if (!__in_dev_get_rtnl(dev
))
877 return -EADDRNOTAVAIL
;
878 t
->mlink
= dev
->ifindex
;
879 ip_mc_inc_group(__in_dev_get_rtnl(dev
), t
->parms
.iph
.daddr
);
884 static int ipgre_close(struct net_device
*dev
)
886 struct ip_tunnel
*t
= netdev_priv(dev
);
888 if (ipv4_is_multicast(t
->parms
.iph
.daddr
) && t
->mlink
) {
889 struct in_device
*in_dev
;
890 in_dev
= inetdev_by_index(t
->net
, t
->mlink
);
892 ip_mc_dec_group(in_dev
, t
->parms
.iph
.daddr
);
898 static const struct net_device_ops ipgre_netdev_ops
= {
899 .ndo_init
= ipgre_tunnel_init
,
900 .ndo_uninit
= ip_tunnel_uninit
,
901 #ifdef CONFIG_NET_IPGRE_BROADCAST
902 .ndo_open
= ipgre_open
,
903 .ndo_stop
= ipgre_close
,
905 .ndo_start_xmit
= ipgre_xmit
,
906 .ndo_do_ioctl
= ipgre_tunnel_ioctl
,
907 .ndo_change_mtu
= ip_tunnel_change_mtu
,
908 .ndo_get_stats64
= ip_tunnel_get_stats64
,
909 .ndo_get_iflink
= ip_tunnel_get_iflink
,
912 #define GRE_FEATURES (NETIF_F_SG | \
917 static void ipgre_tunnel_setup(struct net_device
*dev
)
919 dev
->netdev_ops
= &ipgre_netdev_ops
;
920 dev
->type
= ARPHRD_IPGRE
;
921 ip_tunnel_setup(dev
, ipgre_net_id
);
924 static void __gre_tunnel_init(struct net_device
*dev
)
926 struct ip_tunnel
*tunnel
;
928 tunnel
= netdev_priv(dev
);
929 tunnel
->tun_hlen
= gre_calc_hlen(tunnel
->parms
.o_flags
);
930 tunnel
->parms
.iph
.protocol
= IPPROTO_GRE
;
932 tunnel
->hlen
= tunnel
->tun_hlen
+ tunnel
->encap_hlen
;
934 dev
->features
|= GRE_FEATURES
;
935 dev
->hw_features
|= GRE_FEATURES
;
937 if (!(tunnel
->parms
.o_flags
& TUNNEL_SEQ
)) {
938 /* TCP offload with GRE SEQ is not supported, nor
939 * can we support 2 levels of outer headers requiring
942 if (!(tunnel
->parms
.o_flags
& TUNNEL_CSUM
) ||
943 (tunnel
->encap
.type
== TUNNEL_ENCAP_NONE
)) {
944 dev
->features
|= NETIF_F_GSO_SOFTWARE
;
945 dev
->hw_features
|= NETIF_F_GSO_SOFTWARE
;
948 /* Can use a lockless transmit, unless we generate
951 dev
->features
|= NETIF_F_LLTX
;
955 static int ipgre_tunnel_init(struct net_device
*dev
)
957 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
958 struct iphdr
*iph
= &tunnel
->parms
.iph
;
960 __gre_tunnel_init(dev
);
962 memcpy(dev
->dev_addr
, &iph
->saddr
, 4);
963 memcpy(dev
->broadcast
, &iph
->daddr
, 4);
965 dev
->flags
= IFF_NOARP
;
969 if (iph
->daddr
&& !tunnel
->collect_md
) {
970 #ifdef CONFIG_NET_IPGRE_BROADCAST
971 if (ipv4_is_multicast(iph
->daddr
)) {
974 dev
->flags
= IFF_BROADCAST
;
975 dev
->header_ops
= &ipgre_header_ops
;
978 } else if (!tunnel
->collect_md
) {
979 dev
->header_ops
= &ipgre_header_ops
;
982 return ip_tunnel_init(dev
);
985 static const struct gre_protocol ipgre_protocol
= {
987 .err_handler
= gre_err
,
990 static int __net_init
ipgre_init_net(struct net
*net
)
992 return ip_tunnel_init_net(net
, ipgre_net_id
, &ipgre_link_ops
, NULL
);
995 static void __net_exit
ipgre_exit_batch_net(struct list_head
*list_net
)
997 ip_tunnel_delete_nets(list_net
, ipgre_net_id
, &ipgre_link_ops
);
1000 static struct pernet_operations ipgre_net_ops
= {
1001 .init
= ipgre_init_net
,
1002 .exit_batch
= ipgre_exit_batch_net
,
1003 .id
= &ipgre_net_id
,
1004 .size
= sizeof(struct ip_tunnel_net
),
1007 static int ipgre_tunnel_validate(struct nlattr
*tb
[], struct nlattr
*data
[],
1008 struct netlink_ext_ack
*extack
)
1016 if (data
[IFLA_GRE_IFLAGS
])
1017 flags
|= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1018 if (data
[IFLA_GRE_OFLAGS
])
1019 flags
|= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1020 if (flags
& (GRE_VERSION
|GRE_ROUTING
))
1023 if (data
[IFLA_GRE_COLLECT_METADATA
] &&
1024 data
[IFLA_GRE_ENCAP_TYPE
] &&
1025 nla_get_u16(data
[IFLA_GRE_ENCAP_TYPE
]) != TUNNEL_ENCAP_NONE
)
1031 static int ipgre_tap_validate(struct nlattr
*tb
[], struct nlattr
*data
[],
1032 struct netlink_ext_ack
*extack
)
1036 if (tb
[IFLA_ADDRESS
]) {
1037 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
1039 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
1040 return -EADDRNOTAVAIL
;
1046 if (data
[IFLA_GRE_REMOTE
]) {
1047 memcpy(&daddr
, nla_data(data
[IFLA_GRE_REMOTE
]), 4);
1053 return ipgre_tunnel_validate(tb
, data
, extack
);
1056 static int erspan_validate(struct nlattr
*tb
[], struct nlattr
*data
[],
1057 struct netlink_ext_ack
*extack
)
1065 ret
= ipgre_tap_validate(tb
, data
, extack
);
1069 /* ERSPAN should only have GRE sequence and key flag */
1070 if (data
[IFLA_GRE_OFLAGS
])
1071 flags
|= nla_get_be16(data
[IFLA_GRE_OFLAGS
]);
1072 if (data
[IFLA_GRE_IFLAGS
])
1073 flags
|= nla_get_be16(data
[IFLA_GRE_IFLAGS
]);
1074 if (!data
[IFLA_GRE_COLLECT_METADATA
] &&
1075 flags
!= (GRE_SEQ
| GRE_KEY
))
1078 /* ERSPAN Session ID only has 10-bit. Since we reuse
1079 * 32-bit key field as ID, check it's range.
1081 if (data
[IFLA_GRE_IKEY
] &&
1082 (ntohl(nla_get_be32(data
[IFLA_GRE_IKEY
])) & ~ID_MASK
))
1085 if (data
[IFLA_GRE_OKEY
] &&
1086 (ntohl(nla_get_be32(data
[IFLA_GRE_OKEY
])) & ~ID_MASK
))
1092 static int ipgre_netlink_parms(struct net_device
*dev
,
1093 struct nlattr
*data
[],
1094 struct nlattr
*tb
[],
1095 struct ip_tunnel_parm
*parms
,
1098 struct ip_tunnel
*t
= netdev_priv(dev
);
1100 memset(parms
, 0, sizeof(*parms
));
1102 parms
->iph
.protocol
= IPPROTO_GRE
;
1107 if (data
[IFLA_GRE_LINK
])
1108 parms
->link
= nla_get_u32(data
[IFLA_GRE_LINK
]);
1110 if (data
[IFLA_GRE_IFLAGS
])
1111 parms
->i_flags
= gre_flags_to_tnl_flags(nla_get_be16(data
[IFLA_GRE_IFLAGS
]));
1113 if (data
[IFLA_GRE_OFLAGS
])
1114 parms
->o_flags
= gre_flags_to_tnl_flags(nla_get_be16(data
[IFLA_GRE_OFLAGS
]));
1116 if (data
[IFLA_GRE_IKEY
])
1117 parms
->i_key
= nla_get_be32(data
[IFLA_GRE_IKEY
]);
1119 if (data
[IFLA_GRE_OKEY
])
1120 parms
->o_key
= nla_get_be32(data
[IFLA_GRE_OKEY
]);
1122 if (data
[IFLA_GRE_LOCAL
])
1123 parms
->iph
.saddr
= nla_get_in_addr(data
[IFLA_GRE_LOCAL
]);
1125 if (data
[IFLA_GRE_REMOTE
])
1126 parms
->iph
.daddr
= nla_get_in_addr(data
[IFLA_GRE_REMOTE
]);
1128 if (data
[IFLA_GRE_TTL
])
1129 parms
->iph
.ttl
= nla_get_u8(data
[IFLA_GRE_TTL
]);
1131 if (data
[IFLA_GRE_TOS
])
1132 parms
->iph
.tos
= nla_get_u8(data
[IFLA_GRE_TOS
]);
1134 if (!data
[IFLA_GRE_PMTUDISC
] || nla_get_u8(data
[IFLA_GRE_PMTUDISC
])) {
1137 parms
->iph
.frag_off
= htons(IP_DF
);
1140 if (data
[IFLA_GRE_COLLECT_METADATA
]) {
1141 t
->collect_md
= true;
1142 if (dev
->type
== ARPHRD_IPGRE
)
1143 dev
->type
= ARPHRD_NONE
;
1146 if (data
[IFLA_GRE_IGNORE_DF
]) {
1147 if (nla_get_u8(data
[IFLA_GRE_IGNORE_DF
])
1148 && (parms
->iph
.frag_off
& htons(IP_DF
)))
1150 t
->ignore_df
= !!nla_get_u8(data
[IFLA_GRE_IGNORE_DF
]);
1153 if (data
[IFLA_GRE_FWMARK
])
1154 *fwmark
= nla_get_u32(data
[IFLA_GRE_FWMARK
]);
1156 if (data
[IFLA_GRE_ERSPAN_VER
]) {
1157 t
->erspan_ver
= nla_get_u8(data
[IFLA_GRE_ERSPAN_VER
]);
1159 if (t
->erspan_ver
!= 1 && t
->erspan_ver
!= 2)
1163 if (t
->erspan_ver
== 1) {
1164 if (data
[IFLA_GRE_ERSPAN_INDEX
]) {
1165 t
->index
= nla_get_u32(data
[IFLA_GRE_ERSPAN_INDEX
]);
1166 if (t
->index
& ~INDEX_MASK
)
1169 } else if (t
->erspan_ver
== 2) {
1170 if (data
[IFLA_GRE_ERSPAN_DIR
]) {
1171 t
->dir
= nla_get_u8(data
[IFLA_GRE_ERSPAN_DIR
]);
1172 if (t
->dir
& ~(DIR_MASK
>> DIR_OFFSET
))
1175 if (data
[IFLA_GRE_ERSPAN_HWID
]) {
1176 t
->hwid
= nla_get_u16(data
[IFLA_GRE_ERSPAN_HWID
]);
1177 if (t
->hwid
& ~(HWID_MASK
>> HWID_OFFSET
))
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
)
1191 memset(ipencap
, 0, sizeof(*ipencap
));
1196 if (data
[IFLA_GRE_ENCAP_TYPE
]) {
1198 ipencap
->type
= nla_get_u16(data
[IFLA_GRE_ENCAP_TYPE
]);
1201 if (data
[IFLA_GRE_ENCAP_FLAGS
]) {
1203 ipencap
->flags
= nla_get_u16(data
[IFLA_GRE_ENCAP_FLAGS
]);
1206 if (data
[IFLA_GRE_ENCAP_SPORT
]) {
1208 ipencap
->sport
= nla_get_be16(data
[IFLA_GRE_ENCAP_SPORT
]);
1211 if (data
[IFLA_GRE_ENCAP_DPORT
]) {
1213 ipencap
->dport
= nla_get_be16(data
[IFLA_GRE_ENCAP_DPORT
]);
1219 static int gre_tap_init(struct net_device
*dev
)
1221 __gre_tunnel_init(dev
);
1222 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
1223 netif_keep_dst(dev
);
1225 return ip_tunnel_init(dev
);
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
,
1232 .ndo_set_mac_address
= eth_mac_addr
,
1233 .ndo_validate_addr
= eth_validate_addr
,
1234 .ndo_change_mtu
= ip_tunnel_change_mtu
,
1235 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1236 .ndo_get_iflink
= ip_tunnel_get_iflink
,
1237 .ndo_fill_metadata_dst
= gre_fill_metadata_dst
,
1240 static int erspan_tunnel_init(struct net_device
*dev
)
1242 struct ip_tunnel
*tunnel
= netdev_priv(dev
);
1244 tunnel
->tun_hlen
= 8;
1245 tunnel
->parms
.iph
.protocol
= IPPROTO_GRE
;
1246 tunnel
->hlen
= tunnel
->tun_hlen
+ tunnel
->encap_hlen
+
1247 erspan_hdr_len(tunnel
->erspan_ver
);
1249 dev
->features
|= GRE_FEATURES
;
1250 dev
->hw_features
|= GRE_FEATURES
;
1251 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
1252 netif_keep_dst(dev
);
1254 return ip_tunnel_init(dev
);
1257 static const struct net_device_ops erspan_netdev_ops
= {
1258 .ndo_init
= erspan_tunnel_init
,
1259 .ndo_uninit
= ip_tunnel_uninit
,
1260 .ndo_start_xmit
= erspan_xmit
,
1261 .ndo_set_mac_address
= eth_mac_addr
,
1262 .ndo_validate_addr
= eth_validate_addr
,
1263 .ndo_change_mtu
= ip_tunnel_change_mtu
,
1264 .ndo_get_stats64
= ip_tunnel_get_stats64
,
1265 .ndo_get_iflink
= ip_tunnel_get_iflink
,
1266 .ndo_fill_metadata_dst
= gre_fill_metadata_dst
,
1269 static void ipgre_tap_setup(struct net_device
*dev
)
1273 dev
->netdev_ops
= &gre_tap_netdev_ops
;
1274 dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
1275 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
1276 ip_tunnel_setup(dev
, gre_tap_net_id
);
1279 static int ipgre_newlink(struct net
*src_net
, struct net_device
*dev
,
1280 struct nlattr
*tb
[], struct nlattr
*data
[],
1281 struct netlink_ext_ack
*extack
)
1283 struct ip_tunnel_parm p
;
1284 struct ip_tunnel_encap ipencap
;
1288 if (ipgre_netlink_encap_parms(data
, &ipencap
)) {
1289 struct ip_tunnel
*t
= netdev_priv(dev
);
1290 err
= ip_tunnel_encap_setup(t
, &ipencap
);
1296 err
= ipgre_netlink_parms(dev
, data
, tb
, &p
, &fwmark
);
1299 return ip_tunnel_newlink(dev
, tb
, &p
, fwmark
);
1302 static int ipgre_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
1303 struct nlattr
*data
[],
1304 struct netlink_ext_ack
*extack
)
1306 struct ip_tunnel
*t
= netdev_priv(dev
);
1307 struct ip_tunnel_encap ipencap
;
1308 __u32 fwmark
= t
->fwmark
;
1309 struct ip_tunnel_parm p
;
1312 if (ipgre_netlink_encap_parms(data
, &ipencap
)) {
1313 err
= ip_tunnel_encap_setup(t
, &ipencap
);
1319 err
= ipgre_netlink_parms(dev
, data
, tb
, &p
, &fwmark
);
1323 err
= ip_tunnel_changelink(dev
, tb
, &p
, fwmark
);
1327 t
->parms
.i_flags
= p
.i_flags
;
1328 t
->parms
.o_flags
= p
.o_flags
;
1330 if (strcmp(dev
->rtnl_link_ops
->kind
, "erspan"))
1331 ipgre_link_update(dev
, !tb
[IFLA_MTU
]);
1336 static size_t ipgre_get_size(const struct net_device
*dev
)
1341 /* IFLA_GRE_IFLAGS */
1343 /* IFLA_GRE_OFLAGS */
1349 /* IFLA_GRE_LOCAL */
1351 /* IFLA_GRE_REMOTE */
1357 /* IFLA_GRE_PMTUDISC */
1359 /* IFLA_GRE_ENCAP_TYPE */
1361 /* IFLA_GRE_ENCAP_FLAGS */
1363 /* IFLA_GRE_ENCAP_SPORT */
1365 /* IFLA_GRE_ENCAP_DPORT */
1367 /* IFLA_GRE_COLLECT_METADATA */
1369 /* IFLA_GRE_IGNORE_DF */
1371 /* IFLA_GRE_FWMARK */
1373 /* IFLA_GRE_ERSPAN_INDEX */
1375 /* IFLA_GRE_ERSPAN_VER */
1377 /* IFLA_GRE_ERSPAN_DIR */
1379 /* IFLA_GRE_ERSPAN_HWID */
1384 static int ipgre_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
1386 struct ip_tunnel
*t
= netdev_priv(dev
);
1387 struct ip_tunnel_parm
*p
= &t
->parms
;
1388 __be16 o_flags
= p
->o_flags
;
1390 if (t
->erspan_ver
== 1 || t
->erspan_ver
== 2) {
1392 o_flags
|= TUNNEL_KEY
;
1394 if (nla_put_u8(skb
, IFLA_GRE_ERSPAN_VER
, t
->erspan_ver
))
1395 goto nla_put_failure
;
1397 if (t
->erspan_ver
== 1) {
1398 if (nla_put_u32(skb
, IFLA_GRE_ERSPAN_INDEX
, t
->index
))
1399 goto nla_put_failure
;
1401 if (nla_put_u8(skb
, IFLA_GRE_ERSPAN_DIR
, t
->dir
))
1402 goto nla_put_failure
;
1403 if (nla_put_u16(skb
, IFLA_GRE_ERSPAN_HWID
, t
->hwid
))
1404 goto nla_put_failure
;
1408 if (nla_put_u32(skb
, IFLA_GRE_LINK
, p
->link
) ||
1409 nla_put_be16(skb
, IFLA_GRE_IFLAGS
,
1410 gre_tnl_flags_to_gre_flags(p
->i_flags
)) ||
1411 nla_put_be16(skb
, IFLA_GRE_OFLAGS
,
1412 gre_tnl_flags_to_gre_flags(o_flags
)) ||
1413 nla_put_be32(skb
, IFLA_GRE_IKEY
, p
->i_key
) ||
1414 nla_put_be32(skb
, IFLA_GRE_OKEY
, p
->o_key
) ||
1415 nla_put_in_addr(skb
, IFLA_GRE_LOCAL
, p
->iph
.saddr
) ||
1416 nla_put_in_addr(skb
, IFLA_GRE_REMOTE
, p
->iph
.daddr
) ||
1417 nla_put_u8(skb
, IFLA_GRE_TTL
, p
->iph
.ttl
) ||
1418 nla_put_u8(skb
, IFLA_GRE_TOS
, p
->iph
.tos
) ||
1419 nla_put_u8(skb
, IFLA_GRE_PMTUDISC
,
1420 !!(p
->iph
.frag_off
& htons(IP_DF
))) ||
1421 nla_put_u32(skb
, IFLA_GRE_FWMARK
, t
->fwmark
))
1422 goto nla_put_failure
;
1424 if (nla_put_u16(skb
, IFLA_GRE_ENCAP_TYPE
,
1426 nla_put_be16(skb
, IFLA_GRE_ENCAP_SPORT
,
1428 nla_put_be16(skb
, IFLA_GRE_ENCAP_DPORT
,
1430 nla_put_u16(skb
, IFLA_GRE_ENCAP_FLAGS
,
1432 goto nla_put_failure
;
1434 if (nla_put_u8(skb
, IFLA_GRE_IGNORE_DF
, t
->ignore_df
))
1435 goto nla_put_failure
;
1437 if (t
->collect_md
) {
1438 if (nla_put_flag(skb
, IFLA_GRE_COLLECT_METADATA
))
1439 goto nla_put_failure
;
1448 static void erspan_setup(struct net_device
*dev
)
1450 struct ip_tunnel
*t
= netdev_priv(dev
);
1454 dev
->netdev_ops
= &erspan_netdev_ops
;
1455 dev
->priv_flags
&= ~IFF_TX_SKB_SHARING
;
1456 dev
->priv_flags
|= IFF_LIVE_ADDR_CHANGE
;
1457 ip_tunnel_setup(dev
, erspan_net_id
);
1461 static const struct nla_policy ipgre_policy
[IFLA_GRE_MAX
+ 1] = {
1462 [IFLA_GRE_LINK
] = { .type
= NLA_U32
},
1463 [IFLA_GRE_IFLAGS
] = { .type
= NLA_U16
},
1464 [IFLA_GRE_OFLAGS
] = { .type
= NLA_U16
},
1465 [IFLA_GRE_IKEY
] = { .type
= NLA_U32
},
1466 [IFLA_GRE_OKEY
] = { .type
= NLA_U32
},
1467 [IFLA_GRE_LOCAL
] = { .len
= FIELD_SIZEOF(struct iphdr
, saddr
) },
1468 [IFLA_GRE_REMOTE
] = { .len
= FIELD_SIZEOF(struct iphdr
, daddr
) },
1469 [IFLA_GRE_TTL
] = { .type
= NLA_U8
},
1470 [IFLA_GRE_TOS
] = { .type
= NLA_U8
},
1471 [IFLA_GRE_PMTUDISC
] = { .type
= NLA_U8
},
1472 [IFLA_GRE_ENCAP_TYPE
] = { .type
= NLA_U16
},
1473 [IFLA_GRE_ENCAP_FLAGS
] = { .type
= NLA_U16
},
1474 [IFLA_GRE_ENCAP_SPORT
] = { .type
= NLA_U16
},
1475 [IFLA_GRE_ENCAP_DPORT
] = { .type
= NLA_U16
},
1476 [IFLA_GRE_COLLECT_METADATA
] = { .type
= NLA_FLAG
},
1477 [IFLA_GRE_IGNORE_DF
] = { .type
= NLA_U8
},
1478 [IFLA_GRE_FWMARK
] = { .type
= NLA_U32
},
1479 [IFLA_GRE_ERSPAN_INDEX
] = { .type
= NLA_U32
},
1480 [IFLA_GRE_ERSPAN_VER
] = { .type
= NLA_U8
},
1481 [IFLA_GRE_ERSPAN_DIR
] = { .type
= NLA_U8
},
1482 [IFLA_GRE_ERSPAN_HWID
] = { .type
= NLA_U16
},
1485 static struct rtnl_link_ops ipgre_link_ops __read_mostly
= {
1487 .maxtype
= IFLA_GRE_MAX
,
1488 .policy
= ipgre_policy
,
1489 .priv_size
= sizeof(struct ip_tunnel
),
1490 .setup
= ipgre_tunnel_setup
,
1491 .validate
= ipgre_tunnel_validate
,
1492 .newlink
= ipgre_newlink
,
1493 .changelink
= ipgre_changelink
,
1494 .dellink
= ip_tunnel_dellink
,
1495 .get_size
= ipgre_get_size
,
1496 .fill_info
= ipgre_fill_info
,
1497 .get_link_net
= ip_tunnel_get_link_net
,
1500 static struct rtnl_link_ops ipgre_tap_ops __read_mostly
= {
1502 .maxtype
= IFLA_GRE_MAX
,
1503 .policy
= ipgre_policy
,
1504 .priv_size
= sizeof(struct ip_tunnel
),
1505 .setup
= ipgre_tap_setup
,
1506 .validate
= ipgre_tap_validate
,
1507 .newlink
= ipgre_newlink
,
1508 .changelink
= ipgre_changelink
,
1509 .dellink
= ip_tunnel_dellink
,
1510 .get_size
= ipgre_get_size
,
1511 .fill_info
= ipgre_fill_info
,
1512 .get_link_net
= ip_tunnel_get_link_net
,
1515 static struct rtnl_link_ops erspan_link_ops __read_mostly
= {
1517 .maxtype
= IFLA_GRE_MAX
,
1518 .policy
= ipgre_policy
,
1519 .priv_size
= sizeof(struct ip_tunnel
),
1520 .setup
= erspan_setup
,
1521 .validate
= erspan_validate
,
1522 .newlink
= ipgre_newlink
,
1523 .changelink
= ipgre_changelink
,
1524 .dellink
= ip_tunnel_dellink
,
1525 .get_size
= ipgre_get_size
,
1526 .fill_info
= ipgre_fill_info
,
1527 .get_link_net
= ip_tunnel_get_link_net
,
1530 struct net_device
*gretap_fb_dev_create(struct net
*net
, const char *name
,
1531 u8 name_assign_type
)
1533 struct nlattr
*tb
[IFLA_MAX
+ 1];
1534 struct net_device
*dev
;
1535 LIST_HEAD(list_kill
);
1536 struct ip_tunnel
*t
;
1539 memset(&tb
, 0, sizeof(tb
));
1541 dev
= rtnl_create_link(net
, name
, name_assign_type
,
1542 &ipgre_tap_ops
, tb
, NULL
);
1546 /* Configure flow based GRE device. */
1547 t
= netdev_priv(dev
);
1548 t
->collect_md
= true;
1550 err
= ipgre_newlink(net
, dev
, tb
, NULL
, NULL
);
1553 return ERR_PTR(err
);
1556 /* openvswitch users expect packet sizes to be unrestricted,
1557 * so set the largest MTU we can.
1559 err
= __ip_tunnel_change_mtu(dev
, IP_MAX_MTU
, false);
1563 err
= rtnl_configure_link(dev
, NULL
);
1569 ip_tunnel_dellink(dev
, &list_kill
);
1570 unregister_netdevice_many(&list_kill
);
1571 return ERR_PTR(err
);
1573 EXPORT_SYMBOL_GPL(gretap_fb_dev_create
);
1575 static int __net_init
ipgre_tap_init_net(struct net
*net
)
1577 return ip_tunnel_init_net(net
, gre_tap_net_id
, &ipgre_tap_ops
, "gretap0");
1580 static void __net_exit
ipgre_tap_exit_batch_net(struct list_head
*list_net
)
1582 ip_tunnel_delete_nets(list_net
, gre_tap_net_id
, &ipgre_tap_ops
);
1585 static struct pernet_operations ipgre_tap_net_ops
= {
1586 .init
= ipgre_tap_init_net
,
1587 .exit_batch
= ipgre_tap_exit_batch_net
,
1588 .id
= &gre_tap_net_id
,
1589 .size
= sizeof(struct ip_tunnel_net
),
1592 static int __net_init
erspan_init_net(struct net
*net
)
1594 return ip_tunnel_init_net(net
, erspan_net_id
,
1595 &erspan_link_ops
, "erspan0");
1598 static void __net_exit
erspan_exit_batch_net(struct list_head
*net_list
)
1600 ip_tunnel_delete_nets(net_list
, erspan_net_id
, &erspan_link_ops
);
1603 static struct pernet_operations erspan_net_ops
= {
1604 .init
= erspan_init_net
,
1605 .exit_batch
= erspan_exit_batch_net
,
1606 .id
= &erspan_net_id
,
1607 .size
= sizeof(struct ip_tunnel_net
),
1610 static int __init
ipgre_init(void)
1614 pr_info("GRE over IPv4 tunneling driver\n");
1616 err
= register_pernet_device(&ipgre_net_ops
);
1620 err
= register_pernet_device(&ipgre_tap_net_ops
);
1622 goto pnet_tap_failed
;
1624 err
= register_pernet_device(&erspan_net_ops
);
1626 goto pnet_erspan_failed
;
1628 err
= gre_add_protocol(&ipgre_protocol
, GREPROTO_CISCO
);
1630 pr_info("%s: can't add protocol\n", __func__
);
1631 goto add_proto_failed
;
1634 err
= rtnl_link_register(&ipgre_link_ops
);
1636 goto rtnl_link_failed
;
1638 err
= rtnl_link_register(&ipgre_tap_ops
);
1640 goto tap_ops_failed
;
1642 err
= rtnl_link_register(&erspan_link_ops
);
1644 goto erspan_link_failed
;
1649 rtnl_link_unregister(&ipgre_tap_ops
);
1651 rtnl_link_unregister(&ipgre_link_ops
);
1653 gre_del_protocol(&ipgre_protocol
, GREPROTO_CISCO
);
1655 unregister_pernet_device(&erspan_net_ops
);
1657 unregister_pernet_device(&ipgre_tap_net_ops
);
1659 unregister_pernet_device(&ipgre_net_ops
);
1663 static void __exit
ipgre_fini(void)
1665 rtnl_link_unregister(&ipgre_tap_ops
);
1666 rtnl_link_unregister(&ipgre_link_ops
);
1667 rtnl_link_unregister(&erspan_link_ops
);
1668 gre_del_protocol(&ipgre_protocol
, GREPROTO_CISCO
);
1669 unregister_pernet_device(&ipgre_tap_net_ops
);
1670 unregister_pernet_device(&ipgre_net_ops
);
1671 unregister_pernet_device(&erspan_net_ops
);
1674 module_init(ipgre_init
);
1675 module_exit(ipgre_fini
);
1676 MODULE_LICENSE("GPL");
1677 MODULE_ALIAS_RTNL_LINK("gre");
1678 MODULE_ALIAS_RTNL_LINK("gretap");
1679 MODULE_ALIAS_RTNL_LINK("erspan");
1680 MODULE_ALIAS_NETDEV("gre0");
1681 MODULE_ALIAS_NETDEV("gretap0");
1682 MODULE_ALIAS_NETDEV("erspan0");