cregit-Linux how code gets into the kernel

Release 4.14 net/ipv6/tunnel6.c

Directory: net/ipv6
/*
 * Copyright (C)2003,2004 USAGI/WIDE Project
 *
 * 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/>.
 *
 * Authors      Mitsuru KANDA  <mk@linux-ipv6.org>
 *              YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
 */


#define pr_fmt(fmt) "IPv6: " fmt

#include <linux/icmpv6.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/xfrm.h>


static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;

static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
static DEFINE_MUTEX(tunnel6_mutex);


int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family) { struct xfrm6_tunnel __rcu **pprev; struct xfrm6_tunnel *t; int ret = -EEXIST; int priority = handler->priority; mutex_lock(&tunnel6_mutex); for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; (t = rcu_dereference_protected(*pprev, lockdep_is_held(&tunnel6_mutex))) != NULL; pprev = &t->next) { if (t->priority > priority) break; if (t->priority == priority) goto err; } handler->next = *pprev; rcu_assign_pointer(*pprev, handler); ret = 0; err: mutex_unlock(&tunnel6_mutex); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu9770.29%125.00%
Eric Dumazet2820.29%250.00%
Kazunori Miyazawa139.42%125.00%
Total138100.00%4100.00%

EXPORT_SYMBOL(xfrm6_tunnel_register);
int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family) { struct xfrm6_tunnel __rcu **pprev; struct xfrm6_tunnel *t; int ret = -ENOENT; mutex_lock(&tunnel6_mutex); for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; (t = rcu_dereference_protected(*pprev, lockdep_is_held(&tunnel6_mutex))) != NULL; pprev = &t->next) { if (t == handler) { *pprev = handler->next; ret = 0; break; } } mutex_unlock(&tunnel6_mutex); synchronize_net(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu7768.14%133.33%
Eric Dumazet2320.35%133.33%
Kazunori Miyazawa1311.50%133.33%
Total113100.00%3100.00%

EXPORT_SYMBOL(xfrm6_tunnel_deregister); #define for_each_tunnel_rcu(head, handler) \ for (handler = rcu_dereference(head); \ handler != NULL; \ handler = rcu_dereference(handler->next)) \ static int tunnel6_rcv(struct sk_buff *skb) { struct xfrm6_tunnel *handler; if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) goto drop; for_each_tunnel_rcu(tunnel6_handlers, handler) if (!handler->handler(skb)) return 0; icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); drop: kfree_skb(skb); return 0; }
static int tunnel46_rcv(struct sk_buff *skb) { struct xfrm6_tunnel *handler; if (!pskb_may_pull(skb, sizeof(struct iphdr))) goto drop; for_each_tunnel_rcu(tunnel46_handlers, handler) if (!handler->handler(skb)) return 0; icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); drop: kfree_skb(skb); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa6589.04%125.00%
Eric Dumazet68.22%125.00%
Herbert Xu11.37%125.00%
Colin11.37%125.00%
Total73100.00%4100.00%


static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { struct xfrm6_tunnel *handler; for_each_tunnel_rcu(tunnel6_handlers, handler) if (!handler->err_handler(skb, opt, type, code, offset, info)) break; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu5185.00%125.00%
Eric Dumazet610.00%125.00%
Brian Haley23.33%125.00%
Al Viro11.67%125.00%
Total60100.00%4100.00%


static void tunnel46_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { struct xfrm6_tunnel *handler; for_each_tunnel_rcu(tunnel46_handlers, handler) if (!handler->err_handler(skb, opt, type, code, offset, info)) break; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Kubeček60100.00%1100.00%
Total60100.00%1100.00%

static const struct inet6_protocol tunnel6_protocol = { .handler = tunnel6_rcv, .err_handler = tunnel6_err, .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, }; static const struct inet6_protocol tunnel46_protocol = { .handler = tunnel46_rcv, .err_handler = tunnel46_err, .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, };
static int __init tunnel6_init(void) { if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { pr_err("%s: can't add protocol\n", __func__); return -EAGAIN; } if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) { pr_err("%s: can't add protocol\n", __func__); inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6); return -EAGAIN; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu3146.97%133.33%
Kazunori Miyazawa2740.91%133.33%
Joe Perches812.12%133.33%
Total66100.00%3100.00%


static void __exit tunnel6_fini(void) { if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP)) pr_err("%s: can't remove protocol\n", __func__); if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) pr_err("%s: can't remove protocol\n", __func__); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu2251.16%133.33%
Kazunori Miyazawa1330.23%133.33%
Joe Perches818.60%133.33%
Total43100.00%3100.00%

module_init(tunnel6_init); module_exit(tunnel6_fini); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu42756.04%318.75%
Kazunori Miyazawa16021.00%16.25%
Eric Dumazet8110.63%425.00%
Michal Kubeček618.01%16.25%
Joe Perches233.02%16.25%
Tejun Heo30.39%16.25%
Brian Haley20.26%16.25%
Alexey Dobriyan20.26%16.25%
Ian Morris10.13%16.25%
Al Viro10.13%16.25%
Colin10.13%16.25%
Total762100.00%16100.00%
Directory: net/ipv6
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