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1790 lines
46 KiB
1790 lines
46 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* Linux NET3: GRE over IP protocol decoder. |
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* |
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* Authors: Alexey Kuznetsov ([email protected]) |
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*/ |
|
|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/capability.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <linux/skbuff.h> |
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#include <linux/netdevice.h> |
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#include <linux/in.h> |
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#include <linux/tcp.h> |
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#include <linux/udp.h> |
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#include <linux/if_arp.h> |
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#include <linux/if_vlan.h> |
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#include <linux/init.h> |
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#include <linux/in6.h> |
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#include <linux/inetdevice.h> |
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#include <linux/igmp.h> |
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#include <linux/netfilter_ipv4.h> |
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#include <linux/etherdevice.h> |
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#include <linux/if_ether.h> |
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|
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#include <net/sock.h> |
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#include <net/ip.h> |
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#include <net/icmp.h> |
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#include <net/protocol.h> |
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#include <net/ip_tunnels.h> |
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#include <net/arp.h> |
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#include <net/checksum.h> |
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#include <net/dsfield.h> |
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#include <net/inet_ecn.h> |
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#include <net/xfrm.h> |
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#include <net/net_namespace.h> |
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#include <net/netns/generic.h> |
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#include <net/rtnetlink.h> |
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#include <net/gre.h> |
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#include <net/dst_metadata.h> |
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#include <net/erspan.h> |
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|
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/* |
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Problems & solutions |
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-------------------- |
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|
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1. The most important issue is detecting local dead loops. |
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They would cause complete host lockup in transmit, which |
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would be "resolved" by stack overflow or, if queueing is enabled, |
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with infinite looping in net_bh. |
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|
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We cannot track such dead loops during route installation, |
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it is infeasible task. The most general solutions would be |
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to keep skb->encapsulation counter (sort of local ttl), |
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and silently drop packet when it expires. It is a good |
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solution, but it supposes maintaining new variable in ALL |
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skb, even if no tunneling is used. |
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|
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Current solution: xmit_recursion breaks dead loops. This is a percpu |
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counter, since when we enter the first ndo_xmit(), cpu migration is |
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forbidden. We force an exit if this counter reaches RECURSION_LIMIT |
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|
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2. Networking dead loops would not kill routers, but would really |
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kill network. IP hop limit plays role of "t->recursion" in this case, |
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if we copy it from packet being encapsulated to upper header. |
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It is very good solution, but it introduces two problems: |
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|
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- Routing protocols, using packets with ttl=1 (OSPF, RIP2), |
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do not work over tunnels. |
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- traceroute does not work. I planned to relay ICMP from tunnel, |
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so that this problem would be solved and traceroute output |
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would even more informative. This idea appeared to be wrong: |
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only Linux complies to rfc1812 now (yes, guys, Linux is the only |
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true router now :-)), all routers (at least, in neighbourhood of mine) |
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return only 8 bytes of payload. It is the end. |
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|
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Hence, if we want that OSPF worked or traceroute said something reasonable, |
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we should search for another solution. |
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|
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One of them is to parse packet trying to detect inner encapsulation |
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made by our node. It is difficult or even impossible, especially, |
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taking into account fragmentation. TO be short, ttl is not solution at all. |
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|
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Current solution: The solution was UNEXPECTEDLY SIMPLE. |
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We force DF flag on tunnels with preconfigured hop limit, |
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that is ALL. :-) Well, it does not remove the problem completely, |
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but exponential growth of network traffic is changed to linear |
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(branches, that exceed pmtu are pruned) and tunnel mtu |
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rapidly degrades to value <68, where looping stops. |
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Yes, it is not good if there exists a router in the loop, |
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which does not force DF, even when encapsulating packets have DF set. |
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But it is not our problem! Nobody could accuse us, we made |
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all that we could make. Even if it is your gated who injected |
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fatal route to network, even if it were you who configured |
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fatal static route: you are innocent. :-) |
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|
|
Alexey Kuznetsov. |
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*/ |
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|
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static bool log_ecn_error = true; |
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module_param(log_ecn_error, bool, 0644); |
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); |
|
|
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static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
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static const struct header_ops ipgre_header_ops; |
|
|
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static int ipgre_tunnel_init(struct net_device *dev); |
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static void erspan_build_header(struct sk_buff *skb, |
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u32 id, u32 index, |
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bool truncate, bool is_ipv4); |
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|
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static unsigned int ipgre_net_id __read_mostly; |
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static unsigned int gre_tap_net_id __read_mostly; |
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static unsigned int erspan_net_id __read_mostly; |
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|
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static int ipgre_err(struct sk_buff *skb, u32 info, |
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const struct tnl_ptk_info *tpi) |
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{ |
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|
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/* All the routers (except for Linux) return only |
|
8 bytes of packet payload. It means, that precise relaying of |
|
ICMP in the real Internet is absolutely infeasible. |
|
|
|
Moreover, Cisco "wise men" put GRE key to the third word |
|
in GRE header. It makes impossible maintaining even soft |
|
state for keyed GRE tunnels with enabled checksum. Tell |
|
them "thank you". |
|
|
|
Well, I wonder, rfc1812 was written by Cisco employee, |
|
what the hell these idiots break standards established |
|
by themselves??? |
|
*/ |
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struct net *net = dev_net(skb->dev); |
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struct ip_tunnel_net *itn; |
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const struct iphdr *iph; |
|
const int type = icmp_hdr(skb)->type; |
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const int code = icmp_hdr(skb)->code; |
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unsigned int data_len = 0; |
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struct ip_tunnel *t; |
|
|
|
if (tpi->proto == htons(ETH_P_TEB)) |
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itn = net_generic(net, gre_tap_net_id); |
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else if (tpi->proto == htons(ETH_P_ERSPAN) || |
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tpi->proto == htons(ETH_P_ERSPAN2)) |
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itn = net_generic(net, erspan_net_id); |
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else |
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itn = net_generic(net, ipgre_net_id); |
|
|
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iph = (const struct iphdr *)(icmp_hdr(skb) + 1); |
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t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
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iph->daddr, iph->saddr, tpi->key); |
|
|
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if (!t) |
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return -ENOENT; |
|
|
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switch (type) { |
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default: |
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case ICMP_PARAMETERPROB: |
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return 0; |
|
|
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case ICMP_DEST_UNREACH: |
|
switch (code) { |
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case ICMP_SR_FAILED: |
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case ICMP_PORT_UNREACH: |
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/* Impossible event. */ |
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return 0; |
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default: |
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/* All others are translated to HOST_UNREACH. |
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rfc2003 contains "deep thoughts" about NET_UNREACH, |
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I believe they are just ether pollution. --ANK |
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*/ |
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break; |
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} |
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break; |
|
|
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case ICMP_TIME_EXCEEDED: |
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if (code != ICMP_EXC_TTL) |
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return 0; |
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data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ |
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break; |
|
|
|
case ICMP_REDIRECT: |
|
break; |
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} |
|
|
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#if IS_ENABLED(CONFIG_IPV6) |
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if (tpi->proto == htons(ETH_P_IPV6) && |
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!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, |
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type, data_len)) |
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return 0; |
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#endif |
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|
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if (t->parms.iph.daddr == 0 || |
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ipv4_is_multicast(t->parms.iph.daddr)) |
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return 0; |
|
|
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if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
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return 0; |
|
|
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if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
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t->err_count++; |
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else |
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t->err_count = 1; |
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t->err_time = jiffies; |
|
|
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return 0; |
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} |
|
|
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static void gre_err(struct sk_buff *skb, u32 info) |
|
{ |
|
/* All the routers (except for Linux) return only |
|
* 8 bytes of packet payload. It means, that precise relaying of |
|
* ICMP in the real Internet is absolutely infeasible. |
|
* |
|
* Moreover, Cisco "wise men" put GRE key to the third word |
|
* in GRE header. It makes impossible maintaining even soft |
|
* state for keyed |
|
* GRE tunnels with enabled checksum. Tell them "thank you". |
|
* |
|
* Well, I wonder, rfc1812 was written by Cisco employee, |
|
* what the hell these idiots break standards established |
|
* by themselves??? |
|
*/ |
|
|
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const struct iphdr *iph = (struct iphdr *)skb->data; |
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const int type = icmp_hdr(skb)->type; |
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const int code = icmp_hdr(skb)->code; |
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struct tnl_ptk_info tpi; |
|
|
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if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IP), |
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iph->ihl * 4) < 0) |
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return; |
|
|
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if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { |
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ipv4_update_pmtu(skb, dev_net(skb->dev), info, |
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skb->dev->ifindex, IPPROTO_GRE); |
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return; |
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} |
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if (type == ICMP_REDIRECT) { |
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ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, |
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IPPROTO_GRE); |
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return; |
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} |
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|
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ipgre_err(skb, info, &tpi); |
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} |
|
|
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static bool is_erspan_type1(int gre_hdr_len) |
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{ |
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/* Both ERSPAN type I (version 0) and type II (version 1) use |
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* protocol 0x88BE, but the type I has only 4-byte GRE header, |
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* while type II has 8-byte. |
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*/ |
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return gre_hdr_len == 4; |
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} |
|
|
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static int erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
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int gre_hdr_len) |
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{ |
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struct net *net = dev_net(skb->dev); |
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struct metadata_dst *tun_dst = NULL; |
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struct erspan_base_hdr *ershdr; |
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struct ip_tunnel_net *itn; |
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struct ip_tunnel *tunnel; |
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const struct iphdr *iph; |
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struct erspan_md2 *md2; |
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int ver; |
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int len; |
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|
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itn = net_generic(net, erspan_net_id); |
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iph = ip_hdr(skb); |
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if (is_erspan_type1(gre_hdr_len)) { |
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ver = 0; |
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tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, |
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tpi->flags | TUNNEL_NO_KEY, |
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iph->saddr, iph->daddr, 0); |
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} else { |
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ershdr = (struct erspan_base_hdr *)(skb->data + gre_hdr_len); |
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ver = ershdr->ver; |
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tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, |
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tpi->flags | TUNNEL_KEY, |
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iph->saddr, iph->daddr, tpi->key); |
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} |
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|
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if (tunnel) { |
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if (is_erspan_type1(gre_hdr_len)) |
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len = gre_hdr_len; |
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else |
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len = gre_hdr_len + erspan_hdr_len(ver); |
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|
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if (unlikely(!pskb_may_pull(skb, len))) |
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return PACKET_REJECT; |
|
|
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if (__iptunnel_pull_header(skb, |
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len, |
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htons(ETH_P_TEB), |
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false, false) < 0) |
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goto drop; |
|
|
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if (tunnel->collect_md) { |
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struct erspan_metadata *pkt_md, *md; |
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struct ip_tunnel_info *info; |
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unsigned char *gh; |
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__be64 tun_id; |
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__be16 flags; |
|
|
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tpi->flags |= TUNNEL_KEY; |
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flags = tpi->flags; |
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tun_id = key32_to_tunnel_id(tpi->key); |
|
|
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tun_dst = ip_tun_rx_dst(skb, flags, |
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tun_id, sizeof(*md)); |
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if (!tun_dst) |
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return PACKET_REJECT; |
|
|
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/* skb can be uncloned in __iptunnel_pull_header, so |
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* old pkt_md is no longer valid and we need to reset |
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* it |
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*/ |
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gh = skb_network_header(skb) + |
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skb_network_header_len(skb); |
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pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len + |
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sizeof(*ershdr)); |
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md = ip_tunnel_info_opts(&tun_dst->u.tun_info); |
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md->version = ver; |
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md2 = &md->u.md2; |
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memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE : |
|
ERSPAN_V2_MDSIZE); |
|
|
|
info = &tun_dst->u.tun_info; |
|
info->key.tun_flags |= TUNNEL_ERSPAN_OPT; |
|
info->options_len = sizeof(*md); |
|
} |
|
|
|
skb_reset_mac_header(skb); |
|
ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
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return PACKET_RCVD; |
|
} |
|
return PACKET_REJECT; |
|
|
|
drop: |
|
kfree_skb(skb); |
|
return PACKET_RCVD; |
|
} |
|
|
|
static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
|
struct ip_tunnel_net *itn, int hdr_len, bool raw_proto) |
|
{ |
|
struct metadata_dst *tun_dst = NULL; |
|
const struct iphdr *iph; |
|
struct ip_tunnel *tunnel; |
|
|
|
iph = ip_hdr(skb); |
|
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags, |
|
iph->saddr, iph->daddr, tpi->key); |
|
|
|
if (tunnel) { |
|
const struct iphdr *tnl_params; |
|
|
|
if (__iptunnel_pull_header(skb, hdr_len, tpi->proto, |
|
raw_proto, false) < 0) |
|
goto drop; |
|
|
|
/* Special case for ipgre_header_parse(), which expects the |
|
* mac_header to point to the outer IP header. |
|
*/ |
|
if (tunnel->dev->header_ops == &ipgre_header_ops) |
|
skb_pop_mac_header(skb); |
|
else |
|
skb_reset_mac_header(skb); |
|
|
|
tnl_params = &tunnel->parms.iph; |
|
if (tunnel->collect_md || tnl_params->daddr == 0) { |
|
__be16 flags; |
|
__be64 tun_id; |
|
|
|
flags = tpi->flags & (TUNNEL_CSUM | TUNNEL_KEY); |
|
tun_id = key32_to_tunnel_id(tpi->key); |
|
tun_dst = ip_tun_rx_dst(skb, flags, tun_id, 0); |
|
if (!tun_dst) |
|
return PACKET_REJECT; |
|
} |
|
|
|
ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); |
|
return PACKET_RCVD; |
|
} |
|
return PACKET_NEXT; |
|
|
|
drop: |
|
kfree_skb(skb); |
|
return PACKET_RCVD; |
|
} |
|
|
|
static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
|
int hdr_len) |
|
{ |
|
struct net *net = dev_net(skb->dev); |
|
struct ip_tunnel_net *itn; |
|
int res; |
|
|
|
if (tpi->proto == htons(ETH_P_TEB)) |
|
itn = net_generic(net, gre_tap_net_id); |
|
else |
|
itn = net_generic(net, ipgre_net_id); |
|
|
|
res = __ipgre_rcv(skb, tpi, itn, hdr_len, false); |
|
if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) { |
|
/* ipgre tunnels in collect metadata mode should receive |
|
* also ETH_P_TEB traffic. |
|
*/ |
|
itn = net_generic(net, ipgre_net_id); |
|
res = __ipgre_rcv(skb, tpi, itn, hdr_len, true); |
|
} |
|
return res; |
|
} |
|
|
|
static int gre_rcv(struct sk_buff *skb) |
|
{ |
|
struct tnl_ptk_info tpi; |
|
bool csum_err = false; |
|
int hdr_len; |
|
|
|
#ifdef CONFIG_NET_IPGRE_BROADCAST |
|
if (ipv4_is_multicast(ip_hdr(skb)->daddr)) { |
|
/* Looped back packet, drop it! */ |
|
if (rt_is_output_route(skb_rtable(skb))) |
|
goto drop; |
|
} |
|
#endif |
|
|
|
hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IP), 0); |
|
if (hdr_len < 0) |
|
goto drop; |
|
|
|
if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) || |
|
tpi.proto == htons(ETH_P_ERSPAN2))) { |
|
if (erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
|
return 0; |
|
goto out; |
|
} |
|
|
|
if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD) |
|
return 0; |
|
|
|
out: |
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
|
drop: |
|
kfree_skb(skb); |
|
return 0; |
|
} |
|
|
|
static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, |
|
const struct iphdr *tnl_params, |
|
__be16 proto) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
|
|
if (tunnel->parms.o_flags & TUNNEL_SEQ) |
|
tunnel->o_seqno++; |
|
|
|
/* Push GRE header. */ |
|
gre_build_header(skb, tunnel->tun_hlen, |
|
tunnel->parms.o_flags, proto, tunnel->parms.o_key, |
|
htonl(tunnel->o_seqno)); |
|
|
|
ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); |
|
} |
|
|
|
static int gre_handle_offloads(struct sk_buff *skb, bool csum) |
|
{ |
|
return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
|
} |
|
|
|
static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev, |
|
__be16 proto) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
struct ip_tunnel_info *tun_info; |
|
const struct ip_tunnel_key *key; |
|
int tunnel_hlen; |
|
__be16 flags; |
|
|
|
tun_info = skb_tunnel_info(skb); |
|
if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
|
ip_tunnel_info_af(tun_info) != AF_INET)) |
|
goto err_free_skb; |
|
|
|
key = &tun_info->key; |
|
tunnel_hlen = gre_calc_hlen(key->tun_flags); |
|
|
|
if (skb_cow_head(skb, dev->needed_headroom)) |
|
goto err_free_skb; |
|
|
|
/* Push Tunnel header. */ |
|
if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) |
|
goto err_free_skb; |
|
|
|
flags = tun_info->key.tun_flags & |
|
(TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ); |
|
gre_build_header(skb, tunnel_hlen, flags, proto, |
|
tunnel_id_to_key32(tun_info->key.tun_id), |
|
(flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++) : 0); |
|
|
|
ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
|
|
|
return; |
|
|
|
err_free_skb: |
|
kfree_skb(skb); |
|
dev->stats.tx_dropped++; |
|
} |
|
|
|
static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
struct ip_tunnel_info *tun_info; |
|
const struct ip_tunnel_key *key; |
|
struct erspan_metadata *md; |
|
bool truncate = false; |
|
__be16 proto; |
|
int tunnel_hlen; |
|
int version; |
|
int nhoff; |
|
int thoff; |
|
|
|
tun_info = skb_tunnel_info(skb); |
|
if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || |
|
ip_tunnel_info_af(tun_info) != AF_INET)) |
|
goto err_free_skb; |
|
|
|
key = &tun_info->key; |
|
if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) |
|
goto err_free_skb; |
|
if (tun_info->options_len < sizeof(*md)) |
|
goto err_free_skb; |
|
md = ip_tunnel_info_opts(tun_info); |
|
|
|
/* ERSPAN has fixed 8 byte GRE header */ |
|
version = md->version; |
|
tunnel_hlen = 8 + erspan_hdr_len(version); |
|
|
|
if (skb_cow_head(skb, dev->needed_headroom)) |
|
goto err_free_skb; |
|
|
|
if (gre_handle_offloads(skb, false)) |
|
goto err_free_skb; |
|
|
|
if (skb->len > dev->mtu + dev->hard_header_len) { |
|
pskb_trim(skb, dev->mtu + dev->hard_header_len); |
|
truncate = true; |
|
} |
|
|
|
nhoff = skb_network_header(skb) - skb_mac_header(skb); |
|
if (skb->protocol == htons(ETH_P_IP) && |
|
(ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff)) |
|
truncate = true; |
|
|
|
thoff = skb_transport_header(skb) - skb_mac_header(skb); |
|
if (skb->protocol == htons(ETH_P_IPV6) && |
|
(ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)) |
|
truncate = true; |
|
|
|
if (version == 1) { |
|
erspan_build_header(skb, ntohl(tunnel_id_to_key32(key->tun_id)), |
|
ntohl(md->u.index), truncate, true); |
|
proto = htons(ETH_P_ERSPAN); |
|
} else if (version == 2) { |
|
erspan_build_header_v2(skb, |
|
ntohl(tunnel_id_to_key32(key->tun_id)), |
|
md->u.md2.dir, |
|
get_hwid(&md->u.md2), |
|
truncate, true); |
|
proto = htons(ETH_P_ERSPAN2); |
|
} else { |
|
goto err_free_skb; |
|
} |
|
|
|
gre_build_header(skb, 8, TUNNEL_SEQ, |
|
proto, 0, htonl(tunnel->o_seqno++)); |
|
|
|
ip_md_tunnel_xmit(skb, dev, IPPROTO_GRE, tunnel_hlen); |
|
|
|
return; |
|
|
|
err_free_skb: |
|
kfree_skb(skb); |
|
dev->stats.tx_dropped++; |
|
} |
|
|
|
static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
struct ip_tunnel_info *info = skb_tunnel_info(skb); |
|
const struct ip_tunnel_key *key; |
|
struct rtable *rt; |
|
struct flowi4 fl4; |
|
|
|
if (ip_tunnel_info_af(info) != AF_INET) |
|
return -EINVAL; |
|
|
|
key = &info->key; |
|
ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src, |
|
tunnel_id_to_key32(key->tun_id), key->tos, 0, |
|
skb->mark, skb_get_hash(skb)); |
|
rt = ip_route_output_key(dev_net(dev), &fl4); |
|
if (IS_ERR(rt)) |
|
return PTR_ERR(rt); |
|
|
|
ip_rt_put(rt); |
|
info->key.u.ipv4.src = fl4.saddr; |
|
return 0; |
|
} |
|
|
|
static netdev_tx_t ipgre_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
const struct iphdr *tnl_params; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
goto free_skb; |
|
|
|
if (tunnel->collect_md) { |
|
gre_fb_xmit(skb, dev, skb->protocol); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
if (dev->header_ops) { |
|
const int pull_len = tunnel->hlen + sizeof(struct iphdr); |
|
|
|
if (skb_cow_head(skb, 0)) |
|
goto free_skb; |
|
|
|
tnl_params = (const struct iphdr *)skb->data; |
|
|
|
if (pull_len > skb_transport_offset(skb)) |
|
goto free_skb; |
|
|
|
/* Pull skb since ip_tunnel_xmit() needs skb->data pointing |
|
* to gre header. |
|
*/ |
|
skb_pull(skb, pull_len); |
|
skb_reset_mac_header(skb); |
|
} else { |
|
if (skb_cow_head(skb, dev->needed_headroom)) |
|
goto free_skb; |
|
|
|
tnl_params = &tunnel->parms.iph; |
|
} |
|
|
|
if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
|
goto free_skb; |
|
|
|
__gre_xmit(skb, dev, tnl_params, skb->protocol); |
|
return NETDEV_TX_OK; |
|
|
|
free_skb: |
|
kfree_skb(skb); |
|
dev->stats.tx_dropped++; |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static netdev_tx_t erspan_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
bool truncate = false; |
|
__be16 proto; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
goto free_skb; |
|
|
|
if (tunnel->collect_md) { |
|
erspan_fb_xmit(skb, dev); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
if (gre_handle_offloads(skb, false)) |
|
goto free_skb; |
|
|
|
if (skb_cow_head(skb, dev->needed_headroom)) |
|
goto free_skb; |
|
|
|
if (skb->len > dev->mtu + dev->hard_header_len) { |
|
pskb_trim(skb, dev->mtu + dev->hard_header_len); |
|
truncate = true; |
|
} |
|
|
|
/* Push ERSPAN header */ |
|
if (tunnel->erspan_ver == 0) { |
|
proto = htons(ETH_P_ERSPAN); |
|
tunnel->parms.o_flags &= ~TUNNEL_SEQ; |
|
} else if (tunnel->erspan_ver == 1) { |
|
erspan_build_header(skb, ntohl(tunnel->parms.o_key), |
|
tunnel->index, |
|
truncate, true); |
|
proto = htons(ETH_P_ERSPAN); |
|
} else if (tunnel->erspan_ver == 2) { |
|
erspan_build_header_v2(skb, ntohl(tunnel->parms.o_key), |
|
tunnel->dir, tunnel->hwid, |
|
truncate, true); |
|
proto = htons(ETH_P_ERSPAN2); |
|
} else { |
|
goto free_skb; |
|
} |
|
|
|
tunnel->parms.o_flags &= ~TUNNEL_KEY; |
|
__gre_xmit(skb, dev, &tunnel->parms.iph, proto); |
|
return NETDEV_TX_OK; |
|
|
|
free_skb: |
|
kfree_skb(skb); |
|
dev->stats.tx_dropped++; |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
goto free_skb; |
|
|
|
if (tunnel->collect_md) { |
|
gre_fb_xmit(skb, dev, htons(ETH_P_TEB)); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) |
|
goto free_skb; |
|
|
|
if (skb_cow_head(skb, dev->needed_headroom)) |
|
goto free_skb; |
|
|
|
__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB)); |
|
return NETDEV_TX_OK; |
|
|
|
free_skb: |
|
kfree_skb(skb); |
|
dev->stats.tx_dropped++; |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static void ipgre_link_update(struct net_device *dev, bool set_mtu) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
int len; |
|
|
|
len = tunnel->tun_hlen; |
|
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
|
len = tunnel->tun_hlen - len; |
|
tunnel->hlen = tunnel->hlen + len; |
|
|
|
if (dev->header_ops) |
|
dev->hard_header_len += len; |
|
else |
|
dev->needed_headroom += len; |
|
|
|
if (set_mtu) |
|
dev->mtu = max_t(int, dev->mtu - len, 68); |
|
|
|
if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { |
|
if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || |
|
tunnel->encap.type == TUNNEL_ENCAP_NONE) { |
|
dev->features |= NETIF_F_GSO_SOFTWARE; |
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
|
} else { |
|
dev->features &= ~NETIF_F_GSO_SOFTWARE; |
|
dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; |
|
} |
|
dev->features |= NETIF_F_LLTX; |
|
} else { |
|
dev->hw_features &= ~NETIF_F_GSO_SOFTWARE; |
|
dev->features &= ~(NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE); |
|
} |
|
} |
|
|
|
static int ipgre_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, |
|
int cmd) |
|
{ |
|
int err; |
|
|
|
if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { |
|
if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE || |
|
p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)) || |
|
((p->i_flags | p->o_flags) & (GRE_VERSION | GRE_ROUTING))) |
|
return -EINVAL; |
|
} |
|
|
|
p->i_flags = gre_flags_to_tnl_flags(p->i_flags); |
|
p->o_flags = gre_flags_to_tnl_flags(p->o_flags); |
|
|
|
err = ip_tunnel_ctl(dev, p, cmd); |
|
if (err) |
|
return err; |
|
|
|
if (cmd == SIOCCHGTUNNEL) { |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
|
|
t->parms.i_flags = p->i_flags; |
|
t->parms.o_flags = p->o_flags; |
|
|
|
if (strcmp(dev->rtnl_link_ops->kind, "erspan")) |
|
ipgre_link_update(dev, true); |
|
} |
|
|
|
p->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags); |
|
p->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags); |
|
return 0; |
|
} |
|
|
|
/* Nice toy. Unfortunately, useless in real life :-) |
|
It allows to construct virtual multiprotocol broadcast "LAN" |
|
over the Internet, provided multicast routing is tuned. |
|
|
|
|
|
I have no idea was this bicycle invented before me, |
|
so that I had to set ARPHRD_IPGRE to a random value. |
|
I have an impression, that Cisco could make something similar, |
|
but this feature is apparently missing in IOS<=11.2(8). |
|
|
|
I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
|
with broadcast 224.66.66.66. If you have access to mbone, play with me :-) |
|
|
|
ping -t 255 224.66.66.66 |
|
|
|
If nobody answers, mbone does not work. |
|
|
|
ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 |
|
ip addr add 10.66.66.<somewhat>/24 dev Universe |
|
ifconfig Universe up |
|
ifconfig Universe add fe80::<Your_real_addr>/10 |
|
ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 |
|
ftp 10.66.66.66 |
|
... |
|
ftp fec0:6666:6666::193.233.7.65 |
|
... |
|
*/ |
|
static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
|
unsigned short type, |
|
const void *daddr, const void *saddr, unsigned int len) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
struct iphdr *iph; |
|
struct gre_base_hdr *greh; |
|
|
|
iph = skb_push(skb, t->hlen + sizeof(*iph)); |
|
greh = (struct gre_base_hdr *)(iph+1); |
|
greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags); |
|
greh->protocol = htons(type); |
|
|
|
memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); |
|
|
|
/* Set the source hardware address. */ |
|
if (saddr) |
|
memcpy(&iph->saddr, saddr, 4); |
|
if (daddr) |
|
memcpy(&iph->daddr, daddr, 4); |
|
if (iph->daddr) |
|
return t->hlen + sizeof(*iph); |
|
|
|
return -(t->hlen + sizeof(*iph)); |
|
} |
|
|
|
static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
|
{ |
|
const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
|
memcpy(haddr, &iph->saddr, 4); |
|
return 4; |
|
} |
|
|
|
static const struct header_ops ipgre_header_ops = { |
|
.create = ipgre_header, |
|
.parse = ipgre_header_parse, |
|
}; |
|
|
|
#ifdef CONFIG_NET_IPGRE_BROADCAST |
|
static int ipgre_open(struct net_device *dev) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
|
|
if (ipv4_is_multicast(t->parms.iph.daddr)) { |
|
struct flowi4 fl4; |
|
struct rtable *rt; |
|
|
|
rt = ip_route_output_gre(t->net, &fl4, |
|
t->parms.iph.daddr, |
|
t->parms.iph.saddr, |
|
t->parms.o_key, |
|
RT_TOS(t->parms.iph.tos), |
|
t->parms.link); |
|
if (IS_ERR(rt)) |
|
return -EADDRNOTAVAIL; |
|
dev = rt->dst.dev; |
|
ip_rt_put(rt); |
|
if (!__in_dev_get_rtnl(dev)) |
|
return -EADDRNOTAVAIL; |
|
t->mlink = dev->ifindex; |
|
ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
|
} |
|
return 0; |
|
} |
|
|
|
static int ipgre_close(struct net_device *dev) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
|
|
if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
|
struct in_device *in_dev; |
|
in_dev = inetdev_by_index(t->net, t->mlink); |
|
if (in_dev) |
|
ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
|
} |
|
return 0; |
|
} |
|
#endif |
|
|
|
static const struct net_device_ops ipgre_netdev_ops = { |
|
.ndo_init = ipgre_tunnel_init, |
|
.ndo_uninit = ip_tunnel_uninit, |
|
#ifdef CONFIG_NET_IPGRE_BROADCAST |
|
.ndo_open = ipgre_open, |
|
.ndo_stop = ipgre_close, |
|
#endif |
|
.ndo_start_xmit = ipgre_xmit, |
|
.ndo_siocdevprivate = ip_tunnel_siocdevprivate, |
|
.ndo_change_mtu = ip_tunnel_change_mtu, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
.ndo_get_iflink = ip_tunnel_get_iflink, |
|
.ndo_tunnel_ctl = ipgre_tunnel_ctl, |
|
}; |
|
|
|
#define GRE_FEATURES (NETIF_F_SG | \ |
|
NETIF_F_FRAGLIST | \ |
|
NETIF_F_HIGHDMA | \ |
|
NETIF_F_HW_CSUM) |
|
|
|
static void ipgre_tunnel_setup(struct net_device *dev) |
|
{ |
|
dev->netdev_ops = &ipgre_netdev_ops; |
|
dev->type = ARPHRD_IPGRE; |
|
ip_tunnel_setup(dev, ipgre_net_id); |
|
} |
|
|
|
static void __gre_tunnel_init(struct net_device *dev) |
|
{ |
|
struct ip_tunnel *tunnel; |
|
|
|
tunnel = netdev_priv(dev); |
|
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags); |
|
tunnel->parms.iph.protocol = IPPROTO_GRE; |
|
|
|
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; |
|
dev->needed_headroom = tunnel->hlen + sizeof(tunnel->parms.iph); |
|
|
|
dev->features |= GRE_FEATURES; |
|
dev->hw_features |= GRE_FEATURES; |
|
|
|
if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) { |
|
/* TCP offload with GRE SEQ is not supported, nor |
|
* can we support 2 levels of outer headers requiring |
|
* an update. |
|
*/ |
|
if (!(tunnel->parms.o_flags & TUNNEL_CSUM) || |
|
(tunnel->encap.type == TUNNEL_ENCAP_NONE)) { |
|
dev->features |= NETIF_F_GSO_SOFTWARE; |
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
|
} |
|
|
|
/* Can use a lockless transmit, unless we generate |
|
* output sequences |
|
*/ |
|
dev->features |= NETIF_F_LLTX; |
|
} |
|
} |
|
|
|
static int ipgre_tunnel_init(struct net_device *dev) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
struct iphdr *iph = &tunnel->parms.iph; |
|
|
|
__gre_tunnel_init(dev); |
|
|
|
memcpy(dev->dev_addr, &iph->saddr, 4); |
|
memcpy(dev->broadcast, &iph->daddr, 4); |
|
|
|
dev->flags = IFF_NOARP; |
|
netif_keep_dst(dev); |
|
dev->addr_len = 4; |
|
|
|
if (iph->daddr && !tunnel->collect_md) { |
|
#ifdef CONFIG_NET_IPGRE_BROADCAST |
|
if (ipv4_is_multicast(iph->daddr)) { |
|
if (!iph->saddr) |
|
return -EINVAL; |
|
dev->flags = IFF_BROADCAST; |
|
dev->header_ops = &ipgre_header_ops; |
|
dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
|
dev->needed_headroom = 0; |
|
} |
|
#endif |
|
} else if (!tunnel->collect_md) { |
|
dev->header_ops = &ipgre_header_ops; |
|
dev->hard_header_len = tunnel->hlen + sizeof(*iph); |
|
dev->needed_headroom = 0; |
|
} |
|
|
|
return ip_tunnel_init(dev); |
|
} |
|
|
|
static const struct gre_protocol ipgre_protocol = { |
|
.handler = gre_rcv, |
|
.err_handler = gre_err, |
|
}; |
|
|
|
static int __net_init ipgre_init_net(struct net *net) |
|
{ |
|
return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL); |
|
} |
|
|
|
static void __net_exit ipgre_exit_batch_net(struct list_head *list_net) |
|
{ |
|
ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops); |
|
} |
|
|
|
static struct pernet_operations ipgre_net_ops = { |
|
.init = ipgre_init_net, |
|
.exit_batch = ipgre_exit_batch_net, |
|
.id = &ipgre_net_id, |
|
.size = sizeof(struct ip_tunnel_net), |
|
}; |
|
|
|
static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
__be16 flags; |
|
|
|
if (!data) |
|
return 0; |
|
|
|
flags = 0; |
|
if (data[IFLA_GRE_IFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
|
if (data[IFLA_GRE_OFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
|
if (flags & (GRE_VERSION|GRE_ROUTING)) |
|
return -EINVAL; |
|
|
|
if (data[IFLA_GRE_COLLECT_METADATA] && |
|
data[IFLA_GRE_ENCAP_TYPE] && |
|
nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
__be32 daddr; |
|
|
|
if (tb[IFLA_ADDRESS]) { |
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
|
return -EINVAL; |
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
|
return -EADDRNOTAVAIL; |
|
} |
|
|
|
if (!data) |
|
goto out; |
|
|
|
if (data[IFLA_GRE_REMOTE]) { |
|
memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); |
|
if (!daddr) |
|
return -EINVAL; |
|
} |
|
|
|
out: |
|
return ipgre_tunnel_validate(tb, data, extack); |
|
} |
|
|
|
static int erspan_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
__be16 flags = 0; |
|
int ret; |
|
|
|
if (!data) |
|
return 0; |
|
|
|
ret = ipgre_tap_validate(tb, data, extack); |
|
if (ret) |
|
return ret; |
|
|
|
if (data[IFLA_GRE_ERSPAN_VER] && |
|
nla_get_u8(data[IFLA_GRE_ERSPAN_VER]) == 0) |
|
return 0; |
|
|
|
/* ERSPAN type II/III should only have GRE sequence and key flag */ |
|
if (data[IFLA_GRE_OFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); |
|
if (data[IFLA_GRE_IFLAGS]) |
|
flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); |
|
if (!data[IFLA_GRE_COLLECT_METADATA] && |
|
flags != (GRE_SEQ | GRE_KEY)) |
|
return -EINVAL; |
|
|
|
/* ERSPAN Session ID only has 10-bit. Since we reuse |
|
* 32-bit key field as ID, check it's range. |
|
*/ |
|
if (data[IFLA_GRE_IKEY] && |
|
(ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK)) |
|
return -EINVAL; |
|
|
|
if (data[IFLA_GRE_OKEY] && |
|
(ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static int ipgre_netlink_parms(struct net_device *dev, |
|
struct nlattr *data[], |
|
struct nlattr *tb[], |
|
struct ip_tunnel_parm *parms, |
|
__u32 *fwmark) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
|
|
memset(parms, 0, sizeof(*parms)); |
|
|
|
parms->iph.protocol = IPPROTO_GRE; |
|
|
|
if (!data) |
|
return 0; |
|
|
|
if (data[IFLA_GRE_LINK]) |
|
parms->link = nla_get_u32(data[IFLA_GRE_LINK]); |
|
|
|
if (data[IFLA_GRE_IFLAGS]) |
|
parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS])); |
|
|
|
if (data[IFLA_GRE_OFLAGS]) |
|
parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS])); |
|
|
|
if (data[IFLA_GRE_IKEY]) |
|
parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); |
|
|
|
if (data[IFLA_GRE_OKEY]) |
|
parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); |
|
|
|
if (data[IFLA_GRE_LOCAL]) |
|
parms->iph.saddr = nla_get_in_addr(data[IFLA_GRE_LOCAL]); |
|
|
|
if (data[IFLA_GRE_REMOTE]) |
|
parms->iph.daddr = nla_get_in_addr(data[IFLA_GRE_REMOTE]); |
|
|
|
if (data[IFLA_GRE_TTL]) |
|
parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); |
|
|
|
if (data[IFLA_GRE_TOS]) |
|
parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); |
|
|
|
if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) { |
|
if (t->ignore_df) |
|
return -EINVAL; |
|
parms->iph.frag_off = htons(IP_DF); |
|
} |
|
|
|
if (data[IFLA_GRE_COLLECT_METADATA]) { |
|
t->collect_md = true; |
|
if (dev->type == ARPHRD_IPGRE) |
|
dev->type = ARPHRD_NONE; |
|
} |
|
|
|
if (data[IFLA_GRE_IGNORE_DF]) { |
|
if (nla_get_u8(data[IFLA_GRE_IGNORE_DF]) |
|
&& (parms->iph.frag_off & htons(IP_DF))) |
|
return -EINVAL; |
|
t->ignore_df = !!nla_get_u8(data[IFLA_GRE_IGNORE_DF]); |
|
} |
|
|
|
if (data[IFLA_GRE_FWMARK]) |
|
*fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); |
|
|
|
return 0; |
|
} |
|
|
|
static int erspan_netlink_parms(struct net_device *dev, |
|
struct nlattr *data[], |
|
struct nlattr *tb[], |
|
struct ip_tunnel_parm *parms, |
|
__u32 *fwmark) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
int err; |
|
|
|
err = ipgre_netlink_parms(dev, data, tb, parms, fwmark); |
|
if (err) |
|
return err; |
|
if (!data) |
|
return 0; |
|
|
|
if (data[IFLA_GRE_ERSPAN_VER]) { |
|
t->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]); |
|
|
|
if (t->erspan_ver > 2) |
|
return -EINVAL; |
|
} |
|
|
|
if (t->erspan_ver == 1) { |
|
if (data[IFLA_GRE_ERSPAN_INDEX]) { |
|
t->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]); |
|
if (t->index & ~INDEX_MASK) |
|
return -EINVAL; |
|
} |
|
} else if (t->erspan_ver == 2) { |
|
if (data[IFLA_GRE_ERSPAN_DIR]) { |
|
t->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]); |
|
if (t->dir & ~(DIR_MASK >> DIR_OFFSET)) |
|
return -EINVAL; |
|
} |
|
if (data[IFLA_GRE_ERSPAN_HWID]) { |
|
t->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]); |
|
if (t->hwid & ~(HWID_MASK >> HWID_OFFSET)) |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* This function returns true when ENCAP attributes are present in the nl msg */ |
|
static bool ipgre_netlink_encap_parms(struct nlattr *data[], |
|
struct ip_tunnel_encap *ipencap) |
|
{ |
|
bool ret = false; |
|
|
|
memset(ipencap, 0, sizeof(*ipencap)); |
|
|
|
if (!data) |
|
return ret; |
|
|
|
if (data[IFLA_GRE_ENCAP_TYPE]) { |
|
ret = true; |
|
ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); |
|
} |
|
|
|
if (data[IFLA_GRE_ENCAP_FLAGS]) { |
|
ret = true; |
|
ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); |
|
} |
|
|
|
if (data[IFLA_GRE_ENCAP_SPORT]) { |
|
ret = true; |
|
ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]); |
|
} |
|
|
|
if (data[IFLA_GRE_ENCAP_DPORT]) { |
|
ret = true; |
|
ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int gre_tap_init(struct net_device *dev) |
|
{ |
|
__gre_tunnel_init(dev); |
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
netif_keep_dst(dev); |
|
|
|
return ip_tunnel_init(dev); |
|
} |
|
|
|
static const struct net_device_ops gre_tap_netdev_ops = { |
|
.ndo_init = gre_tap_init, |
|
.ndo_uninit = ip_tunnel_uninit, |
|
.ndo_start_xmit = gre_tap_xmit, |
|
.ndo_set_mac_address = eth_mac_addr, |
|
.ndo_validate_addr = eth_validate_addr, |
|
.ndo_change_mtu = ip_tunnel_change_mtu, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
.ndo_get_iflink = ip_tunnel_get_iflink, |
|
.ndo_fill_metadata_dst = gre_fill_metadata_dst, |
|
}; |
|
|
|
static int erspan_tunnel_init(struct net_device *dev) |
|
{ |
|
struct ip_tunnel *tunnel = netdev_priv(dev); |
|
|
|
if (tunnel->erspan_ver == 0) |
|
tunnel->tun_hlen = 4; /* 4-byte GRE hdr. */ |
|
else |
|
tunnel->tun_hlen = 8; /* 8-byte GRE hdr. */ |
|
|
|
tunnel->parms.iph.protocol = IPPROTO_GRE; |
|
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen + |
|
erspan_hdr_len(tunnel->erspan_ver); |
|
|
|
dev->features |= GRE_FEATURES; |
|
dev->hw_features |= GRE_FEATURES; |
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
netif_keep_dst(dev); |
|
|
|
return ip_tunnel_init(dev); |
|
} |
|
|
|
static const struct net_device_ops erspan_netdev_ops = { |
|
.ndo_init = erspan_tunnel_init, |
|
.ndo_uninit = ip_tunnel_uninit, |
|
.ndo_start_xmit = erspan_xmit, |
|
.ndo_set_mac_address = eth_mac_addr, |
|
.ndo_validate_addr = eth_validate_addr, |
|
.ndo_change_mtu = ip_tunnel_change_mtu, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
.ndo_get_iflink = ip_tunnel_get_iflink, |
|
.ndo_fill_metadata_dst = gre_fill_metadata_dst, |
|
}; |
|
|
|
static void ipgre_tap_setup(struct net_device *dev) |
|
{ |
|
ether_setup(dev); |
|
dev->max_mtu = 0; |
|
dev->netdev_ops = &gre_tap_netdev_ops; |
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
ip_tunnel_setup(dev, gre_tap_net_id); |
|
} |
|
|
|
static int |
|
ipgre_newlink_encap_setup(struct net_device *dev, struct nlattr *data[]) |
|
{ |
|
struct ip_tunnel_encap ipencap; |
|
|
|
if (ipgre_netlink_encap_parms(data, &ipencap)) { |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
int err = ip_tunnel_encap_setup(t, &ipencap); |
|
|
|
if (err < 0) |
|
return err; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ipgre_newlink(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip_tunnel_parm p; |
|
__u32 fwmark = 0; |
|
int err; |
|
|
|
err = ipgre_newlink_encap_setup(dev, data); |
|
if (err) |
|
return err; |
|
|
|
err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
|
if (err < 0) |
|
return err; |
|
return ip_tunnel_newlink(dev, tb, &p, fwmark); |
|
} |
|
|
|
static int erspan_newlink(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip_tunnel_parm p; |
|
__u32 fwmark = 0; |
|
int err; |
|
|
|
err = ipgre_newlink_encap_setup(dev, data); |
|
if (err) |
|
return err; |
|
|
|
err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); |
|
if (err) |
|
return err; |
|
return ip_tunnel_newlink(dev, tb, &p, fwmark); |
|
} |
|
|
|
static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], |
|
struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
__u32 fwmark = t->fwmark; |
|
struct ip_tunnel_parm p; |
|
int err; |
|
|
|
err = ipgre_newlink_encap_setup(dev, data); |
|
if (err) |
|
return err; |
|
|
|
err = ipgre_netlink_parms(dev, data, tb, &p, &fwmark); |
|
if (err < 0) |
|
return err; |
|
|
|
err = ip_tunnel_changelink(dev, tb, &p, fwmark); |
|
if (err < 0) |
|
return err; |
|
|
|
t->parms.i_flags = p.i_flags; |
|
t->parms.o_flags = p.o_flags; |
|
|
|
ipgre_link_update(dev, !tb[IFLA_MTU]); |
|
|
|
return 0; |
|
} |
|
|
|
static int erspan_changelink(struct net_device *dev, struct nlattr *tb[], |
|
struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
__u32 fwmark = t->fwmark; |
|
struct ip_tunnel_parm p; |
|
int err; |
|
|
|
err = ipgre_newlink_encap_setup(dev, data); |
|
if (err) |
|
return err; |
|
|
|
err = erspan_netlink_parms(dev, data, tb, &p, &fwmark); |
|
if (err < 0) |
|
return err; |
|
|
|
err = ip_tunnel_changelink(dev, tb, &p, fwmark); |
|
if (err < 0) |
|
return err; |
|
|
|
t->parms.i_flags = p.i_flags; |
|
t->parms.o_flags = p.o_flags; |
|
|
|
return 0; |
|
} |
|
|
|
static size_t ipgre_get_size(const struct net_device *dev) |
|
{ |
|
return |
|
/* IFLA_GRE_LINK */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_IFLAGS */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_OFLAGS */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_IKEY */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_OKEY */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_LOCAL */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_REMOTE */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_TTL */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_TOS */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_PMTUDISC */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_ENCAP_TYPE */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_ENCAP_FLAGS */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_ENCAP_SPORT */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_ENCAP_DPORT */ |
|
nla_total_size(2) + |
|
/* IFLA_GRE_COLLECT_METADATA */ |
|
nla_total_size(0) + |
|
/* IFLA_GRE_IGNORE_DF */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_FWMARK */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_ERSPAN_INDEX */ |
|
nla_total_size(4) + |
|
/* IFLA_GRE_ERSPAN_VER */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_ERSPAN_DIR */ |
|
nla_total_size(1) + |
|
/* IFLA_GRE_ERSPAN_HWID */ |
|
nla_total_size(2) + |
|
0; |
|
} |
|
|
|
static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
struct ip_tunnel_parm *p = &t->parms; |
|
__be16 o_flags = p->o_flags; |
|
|
|
if (t->erspan_ver <= 2) { |
|
if (t->erspan_ver != 0 && !t->collect_md) |
|
o_flags |= TUNNEL_KEY; |
|
|
|
if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, t->erspan_ver)) |
|
goto nla_put_failure; |
|
|
|
if (t->erspan_ver == 1) { |
|
if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, t->index)) |
|
goto nla_put_failure; |
|
} else if (t->erspan_ver == 2) { |
|
if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, t->dir)) |
|
goto nla_put_failure; |
|
if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, t->hwid)) |
|
goto nla_put_failure; |
|
} |
|
} |
|
|
|
if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) || |
|
nla_put_be16(skb, IFLA_GRE_IFLAGS, |
|
gre_tnl_flags_to_gre_flags(p->i_flags)) || |
|
nla_put_be16(skb, IFLA_GRE_OFLAGS, |
|
gre_tnl_flags_to_gre_flags(o_flags)) || |
|
nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) || |
|
nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) || |
|
nla_put_in_addr(skb, IFLA_GRE_LOCAL, p->iph.saddr) || |
|
nla_put_in_addr(skb, IFLA_GRE_REMOTE, p->iph.daddr) || |
|
nla_put_u8(skb, IFLA_GRE_TTL, p->iph.ttl) || |
|
nla_put_u8(skb, IFLA_GRE_TOS, p->iph.tos) || |
|
nla_put_u8(skb, IFLA_GRE_PMTUDISC, |
|
!!(p->iph.frag_off & htons(IP_DF))) || |
|
nla_put_u32(skb, IFLA_GRE_FWMARK, t->fwmark)) |
|
goto nla_put_failure; |
|
|
|
if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, |
|
t->encap.type) || |
|
nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT, |
|
t->encap.sport) || |
|
nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT, |
|
t->encap.dport) || |
|
nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, |
|
t->encap.flags)) |
|
goto nla_put_failure; |
|
|
|
if (nla_put_u8(skb, IFLA_GRE_IGNORE_DF, t->ignore_df)) |
|
goto nla_put_failure; |
|
|
|
if (t->collect_md) { |
|
if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA)) |
|
goto nla_put_failure; |
|
} |
|
|
|
return 0; |
|
|
|
nla_put_failure: |
|
return -EMSGSIZE; |
|
} |
|
|
|
static void erspan_setup(struct net_device *dev) |
|
{ |
|
struct ip_tunnel *t = netdev_priv(dev); |
|
|
|
ether_setup(dev); |
|
dev->max_mtu = 0; |
|
dev->netdev_ops = &erspan_netdev_ops; |
|
dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
|
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
|
ip_tunnel_setup(dev, erspan_net_id); |
|
t->erspan_ver = 1; |
|
} |
|
|
|
static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { |
|
[IFLA_GRE_LINK] = { .type = NLA_U32 }, |
|
[IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, |
|
[IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, |
|
[IFLA_GRE_IKEY] = { .type = NLA_U32 }, |
|
[IFLA_GRE_OKEY] = { .type = NLA_U32 }, |
|
[IFLA_GRE_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, |
|
[IFLA_GRE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, |
|
[IFLA_GRE_TTL] = { .type = NLA_U8 }, |
|
[IFLA_GRE_TOS] = { .type = NLA_U8 }, |
|
[IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, |
|
[IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, |
|
[IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, |
|
[IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, |
|
[IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, |
|
[IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
|
[IFLA_GRE_IGNORE_DF] = { .type = NLA_U8 }, |
|
[IFLA_GRE_FWMARK] = { .type = NLA_U32 }, |
|
[IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 }, |
|
[IFLA_GRE_ERSPAN_VER] = { .type = NLA_U8 }, |
|
[IFLA_GRE_ERSPAN_DIR] = { .type = NLA_U8 }, |
|
[IFLA_GRE_ERSPAN_HWID] = { .type = NLA_U16 }, |
|
}; |
|
|
|
static struct rtnl_link_ops ipgre_link_ops __read_mostly = { |
|
.kind = "gre", |
|
.maxtype = IFLA_GRE_MAX, |
|
.policy = ipgre_policy, |
|
.priv_size = sizeof(struct ip_tunnel), |
|
.setup = ipgre_tunnel_setup, |
|
.validate = ipgre_tunnel_validate, |
|
.newlink = ipgre_newlink, |
|
.changelink = ipgre_changelink, |
|
.dellink = ip_tunnel_dellink, |
|
.get_size = ipgre_get_size, |
|
.fill_info = ipgre_fill_info, |
|
.get_link_net = ip_tunnel_get_link_net, |
|
}; |
|
|
|
static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
|
.kind = "gretap", |
|
.maxtype = IFLA_GRE_MAX, |
|
.policy = ipgre_policy, |
|
.priv_size = sizeof(struct ip_tunnel), |
|
.setup = ipgre_tap_setup, |
|
.validate = ipgre_tap_validate, |
|
.newlink = ipgre_newlink, |
|
.changelink = ipgre_changelink, |
|
.dellink = ip_tunnel_dellink, |
|
.get_size = ipgre_get_size, |
|
.fill_info = ipgre_fill_info, |
|
.get_link_net = ip_tunnel_get_link_net, |
|
}; |
|
|
|
static struct rtnl_link_ops erspan_link_ops __read_mostly = { |
|
.kind = "erspan", |
|
.maxtype = IFLA_GRE_MAX, |
|
.policy = ipgre_policy, |
|
.priv_size = sizeof(struct ip_tunnel), |
|
.setup = erspan_setup, |
|
.validate = erspan_validate, |
|
.newlink = erspan_newlink, |
|
.changelink = erspan_changelink, |
|
.dellink = ip_tunnel_dellink, |
|
.get_size = ipgre_get_size, |
|
.fill_info = ipgre_fill_info, |
|
.get_link_net = ip_tunnel_get_link_net, |
|
}; |
|
|
|
struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
|
u8 name_assign_type) |
|
{ |
|
struct nlattr *tb[IFLA_MAX + 1]; |
|
struct net_device *dev; |
|
LIST_HEAD(list_kill); |
|
struct ip_tunnel *t; |
|
int err; |
|
|
|
memset(&tb, 0, sizeof(tb)); |
|
|
|
dev = rtnl_create_link(net, name, name_assign_type, |
|
&ipgre_tap_ops, tb, NULL); |
|
if (IS_ERR(dev)) |
|
return dev; |
|
|
|
/* Configure flow based GRE device. */ |
|
t = netdev_priv(dev); |
|
t->collect_md = true; |
|
|
|
err = ipgre_newlink(net, dev, tb, NULL, NULL); |
|
if (err < 0) { |
|
free_netdev(dev); |
|
return ERR_PTR(err); |
|
} |
|
|
|
/* openvswitch users expect packet sizes to be unrestricted, |
|
* so set the largest MTU we can. |
|
*/ |
|
err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false); |
|
if (err) |
|
goto out; |
|
|
|
err = rtnl_configure_link(dev, NULL); |
|
if (err < 0) |
|
goto out; |
|
|
|
return dev; |
|
out: |
|
ip_tunnel_dellink(dev, &list_kill); |
|
unregister_netdevice_many(&list_kill); |
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL_GPL(gretap_fb_dev_create); |
|
|
|
static int __net_init ipgre_tap_init_net(struct net *net) |
|
{ |
|
return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0"); |
|
} |
|
|
|
static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net) |
|
{ |
|
ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops); |
|
} |
|
|
|
static struct pernet_operations ipgre_tap_net_ops = { |
|
.init = ipgre_tap_init_net, |
|
.exit_batch = ipgre_tap_exit_batch_net, |
|
.id = &gre_tap_net_id, |
|
.size = sizeof(struct ip_tunnel_net), |
|
}; |
|
|
|
static int __net_init erspan_init_net(struct net *net) |
|
{ |
|
return ip_tunnel_init_net(net, erspan_net_id, |
|
&erspan_link_ops, "erspan0"); |
|
} |
|
|
|
static void __net_exit erspan_exit_batch_net(struct list_head *net_list) |
|
{ |
|
ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops); |
|
} |
|
|
|
static struct pernet_operations erspan_net_ops = { |
|
.init = erspan_init_net, |
|
.exit_batch = erspan_exit_batch_net, |
|
.id = &erspan_net_id, |
|
.size = sizeof(struct ip_tunnel_net), |
|
}; |
|
|
|
static int __init ipgre_init(void) |
|
{ |
|
int err; |
|
|
|
pr_info("GRE over IPv4 tunneling driver\n"); |
|
|
|
err = register_pernet_device(&ipgre_net_ops); |
|
if (err < 0) |
|
return err; |
|
|
|
err = register_pernet_device(&ipgre_tap_net_ops); |
|
if (err < 0) |
|
goto pnet_tap_failed; |
|
|
|
err = register_pernet_device(&erspan_net_ops); |
|
if (err < 0) |
|
goto pnet_erspan_failed; |
|
|
|
err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
|
if (err < 0) { |
|
pr_info("%s: can't add protocol\n", __func__); |
|
goto add_proto_failed; |
|
} |
|
|
|
err = rtnl_link_register(&ipgre_link_ops); |
|
if (err < 0) |
|
goto rtnl_link_failed; |
|
|
|
err = rtnl_link_register(&ipgre_tap_ops); |
|
if (err < 0) |
|
goto tap_ops_failed; |
|
|
|
err = rtnl_link_register(&erspan_link_ops); |
|
if (err < 0) |
|
goto erspan_link_failed; |
|
|
|
return 0; |
|
|
|
erspan_link_failed: |
|
rtnl_link_unregister(&ipgre_tap_ops); |
|
tap_ops_failed: |
|
rtnl_link_unregister(&ipgre_link_ops); |
|
rtnl_link_failed: |
|
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
|
add_proto_failed: |
|
unregister_pernet_device(&erspan_net_ops); |
|
pnet_erspan_failed: |
|
unregister_pernet_device(&ipgre_tap_net_ops); |
|
pnet_tap_failed: |
|
unregister_pernet_device(&ipgre_net_ops); |
|
return err; |
|
} |
|
|
|
static void __exit ipgre_fini(void) |
|
{ |
|
rtnl_link_unregister(&ipgre_tap_ops); |
|
rtnl_link_unregister(&ipgre_link_ops); |
|
rtnl_link_unregister(&erspan_link_ops); |
|
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
|
unregister_pernet_device(&ipgre_tap_net_ops); |
|
unregister_pernet_device(&ipgre_net_ops); |
|
unregister_pernet_device(&erspan_net_ops); |
|
} |
|
|
|
module_init(ipgre_init); |
|
module_exit(ipgre_fini); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_RTNL_LINK("gre"); |
|
MODULE_ALIAS_RTNL_LINK("gretap"); |
|
MODULE_ALIAS_RTNL_LINK("erspan"); |
|
MODULE_ALIAS_NETDEV("gre0"); |
|
MODULE_ALIAS_NETDEV("gretap0"); |
|
MODULE_ALIAS_NETDEV("erspan0");
|
|
|