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Linux/net/ipv6/tunnel6.c

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Diff markup

Differences between /net/ipv6/tunnel6.c (Version linux-4.13.16) and /net/ipv6/tunnel6.c (Version linux-4.8.17)


  1 /*                                                  1 /*
  2  * Copyright (C)2003,2004 USAGI/WIDE Project        2  * Copyright (C)2003,2004 USAGI/WIDE Project
  3  *                                                  3  *
  4  * This program is free software; you can redi      4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Publi      5  * it under the terms of the GNU General Public License as published by
  6  * the Free Software Foundation; either versio      6  * the Free Software Foundation; either version 2 of the License, or
  7  * (at your option) any later version.              7  * (at your option) any later version.
  8  *                                                  8  *
  9  * This program is distributed in the hope tha      9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the      10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details     12  * GNU General Public License for more details.
 13  *                                                 13  *
 14  * You should have received a copy of the GNU      14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, see <http:     15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 16  *                                                 16  *
 17  * Authors      Mitsuru KANDA  <mk@linux-ipv6.     17  * Authors      Mitsuru KANDA  <mk@linux-ipv6.org>
 18  *              YOSHIFUJI Hideaki <yoshfuji@li     18  *              YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
 19  */                                                19  */
 20                                                    20 
 21 #define pr_fmt(fmt) "IPv6: " fmt                   21 #define pr_fmt(fmt) "IPv6: " fmt
 22                                                    22 
 23 #include <linux/icmpv6.h>                          23 #include <linux/icmpv6.h>
 24 #include <linux/init.h>                            24 #include <linux/init.h>
 25 #include <linux/module.h>                          25 #include <linux/module.h>
 26 #include <linux/mutex.h>                           26 #include <linux/mutex.h>
 27 #include <linux/netdevice.h>                       27 #include <linux/netdevice.h>
 28 #include <linux/skbuff.h>                          28 #include <linux/skbuff.h>
 29 #include <linux/slab.h>                            29 #include <linux/slab.h>
 30 #include <net/ipv6.h>                              30 #include <net/ipv6.h>
 31 #include <net/protocol.h>                          31 #include <net/protocol.h>
 32 #include <net/xfrm.h>                              32 #include <net/xfrm.h>
 33                                                    33 
 34 static struct xfrm6_tunnel __rcu *tunnel6_hand     34 static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly;
 35 static struct xfrm6_tunnel __rcu *tunnel46_han     35 static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly;
 36 static DEFINE_MUTEX(tunnel6_mutex);                36 static DEFINE_MUTEX(tunnel6_mutex);
 37                                                    37 
 38 int xfrm6_tunnel_register(struct xfrm6_tunnel      38 int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)
 39 {                                                  39 {
 40         struct xfrm6_tunnel __rcu **pprev;         40         struct xfrm6_tunnel __rcu **pprev;
 41         struct xfrm6_tunnel *t;                    41         struct xfrm6_tunnel *t;
 42         int ret = -EEXIST;                         42         int ret = -EEXIST;
 43         int priority = handler->priority;          43         int priority = handler->priority;
 44                                                    44 
 45         mutex_lock(&tunnel6_mutex);                45         mutex_lock(&tunnel6_mutex);
 46                                                    46 
 47         for (pprev = (family == AF_INET6) ? &t     47         for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
 48              (t = rcu_dereference_protected(*p     48              (t = rcu_dereference_protected(*pprev,
 49                         lockdep_is_held(&tunne     49                         lockdep_is_held(&tunnel6_mutex))) != NULL;
 50              pprev = &t->next) {                   50              pprev = &t->next) {
 51                 if (t->priority > priority)        51                 if (t->priority > priority)
 52                         break;                     52                         break;
 53                 if (t->priority == priority)       53                 if (t->priority == priority)
 54                         goto err;                  54                         goto err;
 55         }                                          55         }
 56                                                    56 
 57         handler->next = *pprev;                    57         handler->next = *pprev;
 58         rcu_assign_pointer(*pprev, handler);       58         rcu_assign_pointer(*pprev, handler);
 59                                                    59 
 60         ret = 0;                                   60         ret = 0;
 61                                                    61 
 62 err:                                               62 err:
 63         mutex_unlock(&tunnel6_mutex);              63         mutex_unlock(&tunnel6_mutex);
 64                                                    64 
 65         return ret;                                65         return ret;
 66 }                                                  66 }
 67 EXPORT_SYMBOL(xfrm6_tunnel_register);              67 EXPORT_SYMBOL(xfrm6_tunnel_register);
 68                                                    68 
 69 int xfrm6_tunnel_deregister(struct xfrm6_tunne     69 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
 70 {                                                  70 {
 71         struct xfrm6_tunnel __rcu **pprev;         71         struct xfrm6_tunnel __rcu **pprev;
 72         struct xfrm6_tunnel *t;                    72         struct xfrm6_tunnel *t;
 73         int ret = -ENOENT;                         73         int ret = -ENOENT;
 74                                                    74 
 75         mutex_lock(&tunnel6_mutex);                75         mutex_lock(&tunnel6_mutex);
 76                                                    76 
 77         for (pprev = (family == AF_INET6) ? &t     77         for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
 78              (t = rcu_dereference_protected(*p     78              (t = rcu_dereference_protected(*pprev,
 79                         lockdep_is_held(&tunne     79                         lockdep_is_held(&tunnel6_mutex))) != NULL;
 80              pprev = &t->next) {                   80              pprev = &t->next) {
 81                 if (t == handler) {                81                 if (t == handler) {
 82                         *pprev = handler->next     82                         *pprev = handler->next;
 83                         ret = 0;                   83                         ret = 0;
 84                         break;                     84                         break;
 85                 }                                  85                 }
 86         }                                          86         }
 87                                                    87 
 88         mutex_unlock(&tunnel6_mutex);              88         mutex_unlock(&tunnel6_mutex);
 89                                                    89 
 90         synchronize_net();                         90         synchronize_net();
 91                                                    91 
 92         return ret;                                92         return ret;
 93 }                                                  93 }
 94 EXPORT_SYMBOL(xfrm6_tunnel_deregister);            94 EXPORT_SYMBOL(xfrm6_tunnel_deregister);
 95                                                    95 
 96 #define for_each_tunnel_rcu(head, handler)         96 #define for_each_tunnel_rcu(head, handler)              \
 97         for (handler = rcu_dereference(head);      97         for (handler = rcu_dereference(head);           \
 98              handler != NULL;                      98              handler != NULL;                           \
 99              handler = rcu_dereference(handler     99              handler = rcu_dereference(handler->next))  \
100                                                   100 
101 static int tunnel6_rcv(struct sk_buff *skb)       101 static int tunnel6_rcv(struct sk_buff *skb)
102 {                                                 102 {
103         struct xfrm6_tunnel *handler;             103         struct xfrm6_tunnel *handler;
104                                                   104 
105         if (!pskb_may_pull(skb, sizeof(struct     105         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
106                 goto drop;                        106                 goto drop;
107                                                   107 
108         for_each_tunnel_rcu(tunnel6_handlers,     108         for_each_tunnel_rcu(tunnel6_handlers, handler)
109                 if (!handler->handler(skb))       109                 if (!handler->handler(skb))
110                         return 0;                 110                         return 0;
111                                                   111 
112         icmpv6_send(skb, ICMPV6_DEST_UNREACH,     112         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
113                                                   113 
114 drop:                                             114 drop:
115         kfree_skb(skb);                           115         kfree_skb(skb);
116         return 0;                                 116         return 0;
117 }                                                 117 }
118                                                   118 
119 static int tunnel46_rcv(struct sk_buff *skb)      119 static int tunnel46_rcv(struct sk_buff *skb)
120 {                                                 120 {
121         struct xfrm6_tunnel *handler;             121         struct xfrm6_tunnel *handler;
122                                                   122 
123         if (!pskb_may_pull(skb, sizeof(struct     123         if (!pskb_may_pull(skb, sizeof(struct iphdr)))
124                 goto drop;                        124                 goto drop;
125                                                   125 
126         for_each_tunnel_rcu(tunnel46_handlers,    126         for_each_tunnel_rcu(tunnel46_handlers, handler)
127                 if (!handler->handler(skb))       127                 if (!handler->handler(skb))
128                         return 0;                 128                         return 0;
129                                                   129 
130         icmpv6_send(skb, ICMPV6_DEST_UNREACH,     130         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
131                                                   131 
132 drop:                                             132 drop:
133         kfree_skb(skb);                           133         kfree_skb(skb);
134         return 0;                                 134         return 0;
135 }                                                 135 }
136                                                   136 
137 static void tunnel6_err(struct sk_buff *skb, s    137 static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
138                         u8 type, u8 code, int     138                         u8 type, u8 code, int offset, __be32 info)
139 {                                                 139 {
140         struct xfrm6_tunnel *handler;             140         struct xfrm6_tunnel *handler;
141                                                   141 
142         for_each_tunnel_rcu(tunnel6_handlers,     142         for_each_tunnel_rcu(tunnel6_handlers, handler)
143                 if (!handler->err_handler(skb,    143                 if (!handler->err_handler(skb, opt, type, code, offset, info))
144                         break;                    144                         break;
145 }                                                 145 }
146                                                   146 
147 static void tunnel46_err(struct sk_buff *skb,     147 static void tunnel46_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
148                          u8 type, u8 code, int    148                          u8 type, u8 code, int offset, __be32 info)
149 {                                                 149 {
150         struct xfrm6_tunnel *handler;             150         struct xfrm6_tunnel *handler;
151                                                   151 
152         for_each_tunnel_rcu(tunnel46_handlers,    152         for_each_tunnel_rcu(tunnel46_handlers, handler)
153                 if (!handler->err_handler(skb,    153                 if (!handler->err_handler(skb, opt, type, code, offset, info))
154                         break;                    154                         break;
155 }                                                 155 }
156                                                   156 
157 static const struct inet6_protocol tunnel6_pro    157 static const struct inet6_protocol tunnel6_protocol = {
158         .handler        = tunnel6_rcv,            158         .handler        = tunnel6_rcv,
159         .err_handler    = tunnel6_err,            159         .err_handler    = tunnel6_err,
160         .flags          = INET6_PROTO_NOPOLICY    160         .flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
161 };                                                161 };
162                                                   162 
163 static const struct inet6_protocol tunnel46_pr    163 static const struct inet6_protocol tunnel46_protocol = {
164         .handler        = tunnel46_rcv,           164         .handler        = tunnel46_rcv,
165         .err_handler    = tunnel46_err,           165         .err_handler    = tunnel46_err,
166         .flags          = INET6_PROTO_NOPOLICY    166         .flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
167 };                                                167 };
168                                                   168 
169 static int __init tunnel6_init(void)              169 static int __init tunnel6_init(void)
170 {                                                 170 {
171         if (inet6_add_protocol(&tunnel6_protoc    171         if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
172                 pr_err("%s: can't add protocol    172                 pr_err("%s: can't add protocol\n", __func__);
173                 return -EAGAIN;                   173                 return -EAGAIN;
174         }                                         174         }
175         if (inet6_add_protocol(&tunnel46_proto    175         if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
176                 pr_err("%s: can't add protocol    176                 pr_err("%s: can't add protocol\n", __func__);
177                 inet6_del_protocol(&tunnel6_pr    177                 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
178                 return -EAGAIN;                   178                 return -EAGAIN;
179         }                                         179         }
180         return 0;                                 180         return 0;
181 }                                                 181 }
182                                                   182 
183 static void __exit tunnel6_fini(void)             183 static void __exit tunnel6_fini(void)
184 {                                                 184 {
185         if (inet6_del_protocol(&tunnel46_proto    185         if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
186                 pr_err("%s: can't remove proto    186                 pr_err("%s: can't remove protocol\n", __func__);
187         if (inet6_del_protocol(&tunnel6_protoc    187         if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
188                 pr_err("%s: can't remove proto    188                 pr_err("%s: can't remove protocol\n", __func__);
189 }                                                 189 }
190                                                   190 
191 module_init(tunnel6_init);                        191 module_init(tunnel6_init);
192 module_exit(tunnel6_fini);                        192 module_exit(tunnel6_fini);
193 MODULE_LICENSE("GPL");                            193 MODULE_LICENSE("GPL");
194                                                   194 

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