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Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details [based] [from] [clk] [highbank] [c] you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 355 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Jilayne Lovejoy <opensource@jilayne.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190519154041.837383322@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
186 lines
4.3 KiB
C
186 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C)2003,2004 USAGI/WIDE Project
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*
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* Authors Mitsuru KANDA <mk@linux-ipv6.org>
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* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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*/
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#define pr_fmt(fmt) "IPv6: " fmt
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#include <linux/icmpv6.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
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static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
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static DEFINE_MUTEX(tunnel6_mutex);
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int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
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{
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struct xfrm6_tunnel __rcu **pprev;
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struct xfrm6_tunnel *t;
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int ret = -EEXIST;
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int priority = handler->priority;
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mutex_lock(&tunnel6_mutex);
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for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
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(t = rcu_dereference_protected(*pprev,
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lockdep_is_held(&tunnel6_mutex))) != NULL;
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pprev = &t->next) {
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if (t->priority > priority)
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break;
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if (t->priority == priority)
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goto err;
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}
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handler->next = *pprev;
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rcu_assign_pointer(*pprev, handler);
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ret = 0;
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err:
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mutex_unlock(&tunnel6_mutex);
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return ret;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_register);
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int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
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{
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struct xfrm6_tunnel __rcu **pprev;
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struct xfrm6_tunnel *t;
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int ret = -ENOENT;
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mutex_lock(&tunnel6_mutex);
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for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
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(t = rcu_dereference_protected(*pprev,
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lockdep_is_held(&tunnel6_mutex))) != NULL;
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pprev = &t->next) {
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if (t == handler) {
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*pprev = handler->next;
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ret = 0;
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break;
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}
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}
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mutex_unlock(&tunnel6_mutex);
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synchronize_net();
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return ret;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_deregister);
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#define for_each_tunnel_rcu(head, handler) \
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for (handler = rcu_dereference(head); \
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handler != NULL; \
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handler = rcu_dereference(handler->next)) \
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static int tunnel6_rcv(struct sk_buff *skb)
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{
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struct xfrm6_tunnel *handler;
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if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
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goto drop;
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for_each_tunnel_rcu(tunnel6_handlers, handler)
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if (!handler->handler(skb))
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return 0;
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icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
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drop:
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kfree_skb(skb);
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return 0;
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}
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static int tunnel46_rcv(struct sk_buff *skb)
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{
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struct xfrm6_tunnel *handler;
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if (!pskb_may_pull(skb, sizeof(struct iphdr)))
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goto drop;
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for_each_tunnel_rcu(tunnel46_handlers, handler)
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if (!handler->handler(skb))
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return 0;
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icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
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drop:
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kfree_skb(skb);
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return 0;
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}
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static int tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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struct xfrm6_tunnel *handler;
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for_each_tunnel_rcu(tunnel6_handlers, handler)
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if (!handler->err_handler(skb, opt, type, code, offset, info))
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return 0;
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return -ENOENT;
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}
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static int tunnel46_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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struct xfrm6_tunnel *handler;
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for_each_tunnel_rcu(tunnel46_handlers, handler)
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if (!handler->err_handler(skb, opt, type, code, offset, info))
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return 0;
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return -ENOENT;
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}
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static const struct inet6_protocol tunnel6_protocol = {
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.handler = tunnel6_rcv,
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.err_handler = tunnel6_err,
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.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
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};
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static const struct inet6_protocol tunnel46_protocol = {
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.handler = tunnel46_rcv,
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.err_handler = tunnel46_err,
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.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
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};
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static int __init tunnel6_init(void)
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{
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if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
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pr_err("%s: can't add protocol\n", __func__);
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return -EAGAIN;
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}
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if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
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pr_err("%s: can't add protocol\n", __func__);
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inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
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return -EAGAIN;
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}
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return 0;
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}
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static void __exit tunnel6_fini(void)
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{
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if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
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pr_err("%s: can't remove protocol\n", __func__);
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if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
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pr_err("%s: can't remove protocol\n", __func__);
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}
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module_init(tunnel6_init);
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module_exit(tunnel6_fini);
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MODULE_LICENSE("GPL");
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