Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** -*- linux-c -*- *********************************************************** |
| 2 | * Linux PPP over Ethernet (PPPoX/PPPoE) Sockets |
| 3 | * |
| 4 | * PPPoX --- Generic PPP encapsulation socket family |
| 5 | * PPPoE --- PPP over Ethernet (RFC 2516) |
| 6 | * |
| 7 | * |
| 8 | * Version: 0.7.0 |
| 9 | * |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 10 | * 070228 : Fix to allow multiple sessions with same remote MAC and same |
| 11 | * session id by including the local device ifindex in the |
| 12 | * tuple identifying a session. This also ensures packets can't |
| 13 | * be injected into a session from interfaces other than the one |
| 14 | * specified by userspace. Florian Zumbiehl <florz@florz.de> |
| 15 | * (Oh, BTW, this one is YYMMDD, in case you were wondering ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * 220102 : Fix module use count on failure in pppoe_create, pppox_sk -acme |
| 17 | * 030700 : Fixed connect logic to allow for disconnect. |
| 18 | * 270700 : Fixed potential SMP problems; we must protect against |
| 19 | * simultaneous invocation of ppp_input |
| 20 | * and ppp_unregister_channel. |
| 21 | * 040800 : Respect reference count mechanisms on net-devices. |
| 22 | * 200800 : fix kfree(skb) in pppoe_rcv (acme) |
| 23 | * Module reference count is decremented in the right spot now, |
| 24 | * guards against sock_put not actually freeing the sk |
| 25 | * in pppoe_release. |
| 26 | * 051000 : Initialization cleanup. |
| 27 | * 111100 : Fix recvmsg. |
| 28 | * 050101 : Fix PADT procesing. |
| 29 | * 140501 : Use pppoe_rcv_core to handle all backlog. (Alexey) |
| 30 | * 170701 : Do not lock_sock with rwlock held. (DaveM) |
| 31 | * Ignore discovery frames if user has socket |
| 32 | * locked. (DaveM) |
| 33 | * Ignore return value of dev_queue_xmit in __pppoe_xmit |
| 34 | * or else we may kfree an SKB twice. (DaveM) |
| 35 | * 190701 : When doing copies of skb's in __pppoe_xmit, always delete |
| 36 | * the original skb that was passed in on success, never on |
| 37 | * failure. Delete the copy of the skb on failure to avoid |
| 38 | * a memory leak. |
| 39 | * 081001 : Misc. cleanup (licence string, non-blocking, prevent |
| 40 | * reference of device on close). |
| 41 | * 121301 : New ppp channels interface; cannot unregister a channel |
| 42 | * from interrupts. Thus, we mark the socket as a ZOMBIE |
| 43 | * and do the unregistration later. |
| 44 | * 081002 : seq_file support for proc stuff -acme |
| 45 | * 111602 : Merge all 2.4 fixes into 2.5/2.6 tree. Label 2.5/2.6 |
| 46 | * as version 0.7. Spacing cleanup. |
| 47 | * Author: Michal Ostrowski <mostrows@speakeasy.net> |
| 48 | * Contributors: |
| 49 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 50 | * David S. Miller (davem@redhat.com) |
| 51 | * |
| 52 | * License: |
| 53 | * This program is free software; you can redistribute it and/or |
| 54 | * modify it under the terms of the GNU General Public License |
| 55 | * as published by the Free Software Foundation; either version |
| 56 | * 2 of the License, or (at your option) any later version. |
| 57 | * |
| 58 | */ |
| 59 | |
| 60 | #include <linux/string.h> |
| 61 | #include <linux/module.h> |
| 62 | #include <linux/kernel.h> |
| 63 | #include <linux/slab.h> |
| 64 | #include <linux/errno.h> |
| 65 | #include <linux/netdevice.h> |
| 66 | #include <linux/net.h> |
| 67 | #include <linux/inetdevice.h> |
| 68 | #include <linux/etherdevice.h> |
| 69 | #include <linux/skbuff.h> |
| 70 | #include <linux/init.h> |
| 71 | #include <linux/if_ether.h> |
| 72 | #include <linux/if_pppox.h> |
| 73 | #include <linux/ppp_channel.h> |
| 74 | #include <linux/ppp_defs.h> |
Paul Mackerras | 4b32da2b | 2012-03-04 12:56:55 +0000 | [diff] [blame] | 75 | #include <linux/ppp-ioctl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <linux/notifier.h> |
| 77 | #include <linux/file.h> |
| 78 | #include <linux/proc_fs.h> |
| 79 | #include <linux/seq_file.h> |
| 80 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 81 | #include <linux/nsproxy.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 82 | #include <net/net_namespace.h> |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 83 | #include <net/netns/generic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include <net/sock.h> |
| 85 | |
| 86 | #include <asm/uaccess.h> |
| 87 | |
| 88 | #define PPPOE_HASH_BITS 4 |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 89 | #define PPPOE_HASH_SIZE (1 << PPPOE_HASH_BITS) |
| 90 | #define PPPOE_HASH_MASK (PPPOE_HASH_SIZE - 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb); |
| 93 | |
David S. Miller | 17ba15f | 2005-12-27 20:57:40 -0800 | [diff] [blame] | 94 | static const struct proto_ops pppoe_ops; |
stephen hemminger | d7100da | 2010-08-04 07:34:36 +0000 | [diff] [blame] | 95 | static const struct ppp_channel_ops pppoe_chan_ops; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 96 | |
| 97 | /* per-net private data for this module */ |
Eric Dumazet | f99189b | 2009-11-17 10:42:49 +0000 | [diff] [blame] | 98 | static int pppoe_net_id __read_mostly; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 99 | struct pppoe_net { |
| 100 | /* |
| 101 | * we could use _single_ hash table for all |
| 102 | * nets by injecting net id into the hash but |
| 103 | * it would increase hash chains and add |
| 104 | * a few additional math comparations messy |
| 105 | * as well, moreover in case of SMP less locking |
| 106 | * controversy here |
| 107 | */ |
| 108 | struct pppox_sock *hash_table[PPPOE_HASH_SIZE]; |
| 109 | rwlock_t hash_lock; |
| 110 | }; |
| 111 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 112 | /* |
| 113 | * PPPoE could be in the following stages: |
| 114 | * 1) Discovery stage (to obtain remote MAC and Session ID) |
| 115 | * 2) Session stage (MAC and SID are known) |
| 116 | * |
| 117 | * Ethernet frames have a special tag for this but |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 118 | * we use simpler approach based on session id |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 119 | */ |
| 120 | static inline bool stage_session(__be16 sid) |
| 121 | { |
| 122 | return sid != 0; |
| 123 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 125 | static inline struct pppoe_net *pppoe_pernet(struct net *net) |
| 126 | { |
| 127 | BUG_ON(!net); |
| 128 | |
| 129 | return net_generic(net, pppoe_net_id); |
| 130 | } |
| 131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | static inline int cmp_2_addr(struct pppoe_addr *a, struct pppoe_addr *b) |
| 133 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 134 | return a->sid == b->sid && !memcmp(a->remote, b->remote, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
Al Viro | b963dc1 | 2007-08-23 02:55:33 -0400 | [diff] [blame] | 137 | static inline int cmp_addr(struct pppoe_addr *a, __be16 sid, char *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 139 | return a->sid == sid && !memcmp(a->remote, addr, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 142 | #if 8 % PPPOE_HASH_BITS |
Florian Zumbiehl | f1543f8 | 2007-07-31 13:47:57 -0700 | [diff] [blame] | 143 | #error 8 must be a multiple of PPPOE_HASH_BITS |
| 144 | #endif |
| 145 | |
Al Viro | b963dc1 | 2007-08-23 02:55:33 -0400 | [diff] [blame] | 146 | static int hash_item(__be16 sid, unsigned char *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
Florian Zumbiehl | f1543f8 | 2007-07-31 13:47:57 -0700 | [diff] [blame] | 148 | unsigned char hash = 0; |
| 149 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 151 | for (i = 0; i < ETH_ALEN; i++) |
Florian Zumbiehl | f1543f8 | 2007-07-31 13:47:57 -0700 | [diff] [blame] | 152 | hash ^= addr[i]; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 153 | for (i = 0; i < sizeof(sid_t) * 8; i += 8) |
| 154 | hash ^= (__force __u32)sid >> i; |
| 155 | for (i = 8; (i >>= 1) >= PPPOE_HASH_BITS;) |
| 156 | hash ^= hash >> i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 158 | return hash & PPPOE_HASH_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /********************************************************************** |
| 162 | * |
| 163 | * Set/get/delete/rehash items (internal versions) |
| 164 | * |
| 165 | **********************************************************************/ |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 166 | static struct pppox_sock *__get_item(struct pppoe_net *pn, __be16 sid, |
| 167 | unsigned char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
| 169 | int hash = hash_item(sid, addr); |
| 170 | struct pppox_sock *ret; |
| 171 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 172 | ret = pn->hash_table[hash]; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 173 | while (ret) { |
| 174 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
| 175 | ret->pppoe_ifindex == ifindex) |
| 176 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 178 | ret = ret->next; |
| 179 | } |
| 180 | |
| 181 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 184 | static int __set_item(struct pppoe_net *pn, struct pppox_sock *po) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
| 186 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); |
| 187 | struct pppox_sock *ret; |
| 188 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 189 | ret = pn->hash_table[hash]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | while (ret) { |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 191 | if (cmp_2_addr(&ret->pppoe_pa, &po->pppoe_pa) && |
| 192 | ret->pppoe_ifindex == po->pppoe_ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | return -EALREADY; |
| 194 | |
| 195 | ret = ret->next; |
| 196 | } |
| 197 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 198 | po->next = pn->hash_table[hash]; |
| 199 | pn->hash_table[hash] = po; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
Rami Rosen | 3b12bb6 | 2012-05-17 05:04:50 +0000 | [diff] [blame] | 204 | static void __delete_item(struct pppoe_net *pn, __be16 sid, |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 205 | char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
| 207 | int hash = hash_item(sid, addr); |
| 208 | struct pppox_sock *ret, **src; |
| 209 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 210 | ret = pn->hash_table[hash]; |
| 211 | src = &pn->hash_table[hash]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | while (ret) { |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 214 | if (cmp_addr(&ret->pppoe_pa, sid, addr) && |
| 215 | ret->pppoe_ifindex == ifindex) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | *src = ret->next; |
| 217 | break; |
| 218 | } |
| 219 | |
| 220 | src = &ret->next; |
| 221 | ret = ret->next; |
| 222 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | /********************************************************************** |
| 226 | * |
| 227 | * Set/get/delete/rehash items |
| 228 | * |
| 229 | **********************************************************************/ |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 230 | static inline struct pppox_sock *get_item(struct pppoe_net *pn, __be16 sid, |
| 231 | unsigned char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | { |
| 233 | struct pppox_sock *po; |
| 234 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 235 | read_lock_bh(&pn->hash_lock); |
| 236 | po = __get_item(pn, sid, addr, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | if (po) |
| 238 | sock_hold(sk_pppox(po)); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 239 | read_unlock_bh(&pn->hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
| 241 | return po; |
| 242 | } |
| 243 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 244 | static inline struct pppox_sock *get_item_by_addr(struct net *net, |
| 245 | struct sockaddr_pppox *sp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 247 | struct net_device *dev; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 248 | struct pppoe_net *pn; |
Eric Dumazet | 1178f66 | 2009-11-01 19:51:22 +0000 | [diff] [blame] | 249 | struct pppox_sock *pppox_sock = NULL; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 250 | |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 251 | int ifindex; |
| 252 | |
Eric Dumazet | 1178f66 | 2009-11-01 19:51:22 +0000 | [diff] [blame] | 253 | rcu_read_lock(); |
| 254 | dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev); |
| 255 | if (dev) { |
| 256 | ifindex = dev->ifindex; |
Jiri Pirko | be9e969 | 2010-04-26 01:46:12 +0000 | [diff] [blame] | 257 | pn = pppoe_pernet(net); |
Eric Dumazet | 1178f66 | 2009-11-01 19:51:22 +0000 | [diff] [blame] | 258 | pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid, |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 259 | sp->sa_addr.pppoe.remote, ifindex); |
Eric Dumazet | 1178f66 | 2009-11-01 19:51:22 +0000 | [diff] [blame] | 260 | } |
| 261 | rcu_read_unlock(); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 262 | return pppox_sock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Rami Rosen | 3b12bb6 | 2012-05-17 05:04:50 +0000 | [diff] [blame] | 265 | static inline void delete_item(struct pppoe_net *pn, __be16 sid, |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 266 | char *addr, int ifindex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 268 | write_lock_bh(&pn->hash_lock); |
Rami Rosen | 3b12bb6 | 2012-05-17 05:04:50 +0000 | [diff] [blame] | 269 | __delete_item(pn, sid, addr, ifindex); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 270 | write_unlock_bh(&pn->hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | /*************************************************************************** |
| 274 | * |
| 275 | * Handler for device events. |
| 276 | * Certain device events require that sockets be unconnected. |
| 277 | * |
| 278 | **************************************************************************/ |
| 279 | |
| 280 | static void pppoe_flush_dev(struct net_device *dev) |
| 281 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 282 | struct pppoe_net *pn; |
| 283 | int i; |
| 284 | |
Dan Carpenter | a5e9315 | 2010-05-22 10:27:48 +0000 | [diff] [blame] | 285 | pn = pppoe_pernet(dev_net(dev)); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 286 | write_lock_bh(&pn->hash_lock); |
| 287 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
| 288 | struct pppox_sock *po = pn->hash_table[i]; |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 289 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 291 | while (po) { |
| 292 | while (po && po->pppoe_dev != dev) { |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 293 | po = po->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 295 | |
| 296 | if (!po) |
| 297 | break; |
| 298 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 299 | sk = sk_pppox(po); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 300 | |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 301 | /* We always grab the socket lock, followed by the |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 302 | * hash_lock, in that order. Since we should hold the |
| 303 | * sock lock while doing any unbinding, we need to |
| 304 | * release the lock we're holding. Hold a reference to |
| 305 | * the sock so it doesn't disappear as we're jumping |
| 306 | * between locks. |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 307 | */ |
| 308 | |
| 309 | sock_hold(sk); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 310 | write_unlock_bh(&pn->hash_lock); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 311 | lock_sock(sk); |
| 312 | |
Joe Perches | 8e95a20 | 2009-12-03 07:58:21 +0000 | [diff] [blame] | 313 | if (po->pppoe_dev == dev && |
Ulrich Weber | ae07b0b | 2011-04-06 14:04:49 -0700 | [diff] [blame] | 314 | sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) { |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 315 | pppox_unbind_sock(sk); |
| 316 | sk->sk_state = PPPOX_ZOMBIE; |
| 317 | sk->sk_state_change(sk); |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 318 | po->pppoe_dev = NULL; |
| 319 | dev_put(dev); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | release_sock(sk); |
| 323 | sock_put(sk); |
| 324 | |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 325 | /* Restart the process from the start of the current |
| 326 | * hash chain. We dropped locks so the world may have |
| 327 | * change from underneath us. |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 328 | */ |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 329 | |
| 330 | BUG_ON(pppoe_pernet(dev_net(dev)) == NULL); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 331 | write_lock_bh(&pn->hash_lock); |
| 332 | po = pn->hash_table[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | } |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 335 | write_unlock_bh(&pn->hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | static int pppoe_device_event(struct notifier_block *this, |
| 339 | unsigned long event, void *ptr) |
| 340 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 341 | struct net_device *dev = (struct net_device *)ptr; |
Eric W. Biederman | e9dc865 | 2007-09-12 13:02:17 +0200 | [diff] [blame] | 342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | /* Only look at sockets that are using this specific device. */ |
| 344 | switch (event) { |
David S. Miller | 680ba7c | 2011-07-18 11:48:28 -0700 | [diff] [blame] | 345 | case NETDEV_CHANGEADDR: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | case NETDEV_CHANGEMTU: |
David S. Miller | 680ba7c | 2011-07-18 11:48:28 -0700 | [diff] [blame] | 347 | /* A change in mtu or address is a bad thing, requiring |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | * LCP re-negotiation. |
| 349 | */ |
| 350 | |
| 351 | case NETDEV_GOING_DOWN: |
| 352 | case NETDEV_DOWN: |
| 353 | /* Find every socket on this device and kill it. */ |
| 354 | pppoe_flush_dev(dev); |
| 355 | break; |
| 356 | |
| 357 | default: |
| 358 | break; |
Joe Perches | ee289b6 | 2010-05-17 22:47:34 -0700 | [diff] [blame] | 359 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | return NOTIFY_DONE; |
| 362 | } |
| 363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | static struct notifier_block pppoe_notifier = { |
| 365 | .notifier_call = pppoe_device_event, |
| 366 | }; |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | /************************************************************************ |
| 369 | * |
| 370 | * Do the real work of receiving a PPPoE Session frame. |
| 371 | * |
| 372 | ***********************************************************************/ |
| 373 | static int pppoe_rcv_core(struct sock *sk, struct sk_buff *skb) |
| 374 | { |
| 375 | struct pppox_sock *po = pppox_sk(sk); |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 376 | struct pppox_sock *relay_po; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 378 | /* Backlog receive. Semantics of backlog rcv preclude any code from |
| 379 | * executing in lock_sock()/release_sock() bounds; meaning sk->sk_state |
| 380 | * can't change. |
| 381 | */ |
| 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if (sk->sk_state & PPPOX_BOUND) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | ppp_input(&po->chan, skb); |
| 385 | } else if (sk->sk_state & PPPOX_RELAY) { |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 386 | relay_po = get_item_by_addr(sock_net(sk), |
| 387 | &po->pppoe_relay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | if (relay_po == NULL) |
| 389 | goto abort_kfree; |
| 390 | |
| 391 | if ((sk_pppox(relay_po)->sk_state & PPPOX_CONNECTED) == 0) |
| 392 | goto abort_put; |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | if (!__pppoe_xmit(sk_pppox(relay_po), skb)) |
| 395 | goto abort_put; |
| 396 | } else { |
| 397 | if (sock_queue_rcv_skb(sk, skb)) |
| 398 | goto abort_kfree; |
| 399 | } |
| 400 | |
| 401 | return NET_RX_SUCCESS; |
| 402 | |
| 403 | abort_put: |
| 404 | sock_put(sk_pppox(relay_po)); |
| 405 | |
| 406 | abort_kfree: |
| 407 | kfree_skb(skb); |
| 408 | return NET_RX_DROP; |
| 409 | } |
| 410 | |
| 411 | /************************************************************************ |
| 412 | * |
| 413 | * Receive wrapper called in BH context. |
| 414 | * |
| 415 | ***********************************************************************/ |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 416 | static int pppoe_rcv(struct sk_buff *skb, struct net_device *dev, |
| 417 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | { |
| 419 | struct pppoe_hdr *ph; |
| 420 | struct pppox_sock *po; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 421 | struct pppoe_net *pn; |
Herbert Xu | 392fdb0 | 2008-06-10 14:07:25 -0700 | [diff] [blame] | 422 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 424 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 425 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | goto out; |
| 427 | |
Herbert Xu | 31bac44 | 2007-09-16 16:19:20 -0700 | [diff] [blame] | 428 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
| 429 | goto drop; |
| 430 | |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 431 | ph = pppoe_hdr(skb); |
Herbert Xu | 392fdb0 | 2008-06-10 14:07:25 -0700 | [diff] [blame] | 432 | len = ntohs(ph->length); |
| 433 | |
| 434 | skb_pull_rcsum(skb, sizeof(*ph)); |
| 435 | if (skb->len < len) |
| 436 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
David S. Miller | 263e69c | 2008-10-30 23:11:44 -0700 | [diff] [blame] | 438 | if (pskb_trim_rcsum(skb, len)) |
Herbert Xu | 392fdb0 | 2008-06-10 14:07:25 -0700 | [diff] [blame] | 439 | goto drop; |
| 440 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 441 | pn = pppoe_pernet(dev_net(dev)); |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 442 | |
| 443 | /* Note that get_item does a sock_hold(), so sk_pppox(po) |
| 444 | * is known to be safe. |
| 445 | */ |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 446 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
David S. Miller | 263e69c | 2008-10-30 23:11:44 -0700 | [diff] [blame] | 447 | if (!po) |
Herbert Xu | 392fdb0 | 2008-06-10 14:07:25 -0700 | [diff] [blame] | 448 | goto drop; |
| 449 | |
| 450 | return sk_receive_skb(sk_pppox(po), skb, 0); |
| 451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | drop: |
| 453 | kfree_skb(skb); |
| 454 | out: |
| 455 | return NET_RX_DROP; |
| 456 | } |
| 457 | |
| 458 | /************************************************************************ |
| 459 | * |
| 460 | * Receive a PPPoE Discovery frame. |
| 461 | * This is solely for detection of PADT frames |
| 462 | * |
| 463 | ***********************************************************************/ |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 464 | static int pppoe_disc_rcv(struct sk_buff *skb, struct net_device *dev, |
| 465 | struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | { |
| 468 | struct pppoe_hdr *ph; |
| 469 | struct pppox_sock *po; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 470 | struct pppoe_net *pn; |
Eric W. Biederman | e730c15 | 2007-09-17 11:53:39 -0700 | [diff] [blame] | 471 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 472 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 473 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | goto out; |
| 475 | |
Herbert Xu | bc6cffd1 | 2008-06-10 14:08:25 -0700 | [diff] [blame] | 476 | if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr))) |
| 477 | goto abort; |
| 478 | |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 479 | ph = pppoe_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | if (ph->code != PADT_CODE) |
| 481 | goto abort; |
| 482 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 483 | pn = pppoe_pernet(dev_net(dev)); |
| 484 | po = get_item(pn, ph->sid, eth_hdr(skb)->h_source, dev->ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | if (po) { |
| 486 | struct sock *sk = sk_pppox(po); |
| 487 | |
| 488 | bh_lock_sock(sk); |
| 489 | |
| 490 | /* If the user has locked the socket, just ignore |
| 491 | * the packet. With the way two rcv protocols hook into |
| 492 | * one socket family type, we cannot (easily) distinguish |
| 493 | * what kind of SKB it is during backlog rcv. |
| 494 | */ |
| 495 | if (sock_owned_by_user(sk) == 0) { |
| 496 | /* We're no longer connect at the PPPOE layer, |
| 497 | * and must wait for ppp channel to disconnect us. |
| 498 | */ |
| 499 | sk->sk_state = PPPOX_ZOMBIE; |
| 500 | } |
| 501 | |
| 502 | bh_unlock_sock(sk); |
| 503 | sock_put(sk); |
| 504 | } |
| 505 | |
| 506 | abort: |
| 507 | kfree_skb(skb); |
| 508 | out: |
| 509 | return NET_RX_SUCCESS; /* Lies... :-) */ |
| 510 | } |
| 511 | |
Stephen Hemminger | 7546dd9 | 2009-03-09 08:18:29 +0000 | [diff] [blame] | 512 | static struct packet_type pppoes_ptype __read_mostly = { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 513 | .type = cpu_to_be16(ETH_P_PPP_SES), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | .func = pppoe_rcv, |
| 515 | }; |
| 516 | |
Stephen Hemminger | 7546dd9 | 2009-03-09 08:18:29 +0000 | [diff] [blame] | 517 | static struct packet_type pppoed_ptype __read_mostly = { |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 518 | .type = cpu_to_be16(ETH_P_PPP_DISC), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | .func = pppoe_disc_rcv, |
| 520 | }; |
| 521 | |
Stephen Hemminger | 7546dd9 | 2009-03-09 08:18:29 +0000 | [diff] [blame] | 522 | static struct proto pppoe_sk_proto __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | .name = "PPPOE", |
| 524 | .owner = THIS_MODULE, |
| 525 | .obj_size = sizeof(struct pppox_sock), |
| 526 | }; |
| 527 | |
| 528 | /*********************************************************************** |
| 529 | * |
| 530 | * Initialize a new struct sock. |
| 531 | * |
| 532 | **********************************************************************/ |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 533 | static int pppoe_create(struct net *net, struct socket *sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | struct sock *sk; |
| 536 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 537 | sk = sk_alloc(net, PF_PPPOX, GFP_KERNEL, &pppoe_sk_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | if (!sk) |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 539 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
| 541 | sock_init_data(sock, sk); |
| 542 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 543 | sock->state = SS_UNCONNECTED; |
| 544 | sock->ops = &pppoe_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 546 | sk->sk_backlog_rcv = pppoe_rcv_core; |
| 547 | sk->sk_state = PPPOX_NONE; |
| 548 | sk->sk_type = SOCK_STREAM; |
| 549 | sk->sk_family = PF_PPPOX; |
| 550 | sk->sk_protocol = PX_PROTO_OE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 552 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | static int pppoe_release(struct socket *sock) |
| 556 | { |
| 557 | struct sock *sk = sock->sk; |
| 558 | struct pppox_sock *po; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 559 | struct pppoe_net *pn; |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 560 | struct net *net = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | if (!sk) |
| 563 | return 0; |
| 564 | |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 565 | lock_sock(sk); |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 566 | if (sock_flag(sk, SOCK_DEAD)) { |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 567 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | return -EBADF; |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 569 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 571 | po = pppox_sk(sk); |
| 572 | |
Xiaodong Xu | 2b018d5 | 2012-09-22 00:09:32 +0000 | [diff] [blame] | 573 | if (sk->sk_state & (PPPOX_CONNECTED | PPPOX_BOUND | PPPOX_ZOMBIE)) { |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 574 | dev_put(po->pppoe_dev); |
| 575 | po->pppoe_dev = NULL; |
| 576 | } |
| 577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | pppox_unbind_sock(sk); |
| 579 | |
| 580 | /* Signal the death of the socket. */ |
| 581 | sk->sk_state = PPPOX_DEAD; |
| 582 | |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 583 | net = sock_net(sk); |
| 584 | pn = pppoe_pernet(net); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 585 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 586 | /* |
| 587 | * protect "po" from concurrent updates |
| 588 | * on pppoe_flush_dev |
| 589 | */ |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 590 | delete_item(pn, po->pppoe_pa.sid, po->pppoe_pa.remote, |
| 591 | po->pppoe_ifindex); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | sock_orphan(sk); |
| 594 | sock->sk = NULL; |
| 595 | |
| 596 | skb_queue_purge(&sk->sk_receive_queue); |
Michal Ostrowski | 42dc9cd | 2007-04-20 16:59:24 -0700 | [diff] [blame] | 597 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | sock_put(sk); |
| 599 | |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 600 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | } |
| 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, |
| 604 | int sockaddr_len, int flags) |
| 605 | { |
| 606 | struct sock *sk = sock->sk; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 607 | struct sockaddr_pppox *sp = (struct sockaddr_pppox *)uservaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | struct pppox_sock *po = pppox_sk(sk); |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 609 | struct net_device *dev = NULL; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 610 | struct pppoe_net *pn; |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 611 | struct net *net = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | int error; |
| 613 | |
| 614 | lock_sock(sk); |
| 615 | |
| 616 | error = -EINVAL; |
| 617 | if (sp->sa_protocol != PX_PROTO_OE) |
| 618 | goto end; |
| 619 | |
| 620 | /* Check for already bound sockets */ |
| 621 | error = -EBUSY; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 622 | if ((sk->sk_state & PPPOX_CONNECTED) && |
| 623 | stage_session(sp->sa_addr.pppoe.sid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | goto end; |
| 625 | |
| 626 | /* Check for already disconnected sockets, on attempts to disconnect */ |
| 627 | error = -EALREADY; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 628 | if ((sk->sk_state & PPPOX_DEAD) && |
| 629 | !stage_session(sp->sa_addr.pppoe.sid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | goto end; |
| 631 | |
| 632 | error = 0; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 633 | |
| 634 | /* Delete the old binding */ |
| 635 | if (stage_session(po->pppoe_pa.sid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | pppox_unbind_sock(sk); |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 637 | pn = pppoe_pernet(sock_net(sk)); |
| 638 | delete_item(pn, po->pppoe_pa.sid, |
| 639 | po->pppoe_pa.remote, po->pppoe_ifindex); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 640 | if (po->pppoe_dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | dev_put(po->pppoe_dev); |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 642 | po->pppoe_dev = NULL; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 643 | } |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | memset(sk_pppox(po) + 1, 0, |
| 646 | sizeof(struct pppox_sock) - sizeof(struct sock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | sk->sk_state = PPPOX_NONE; |
| 648 | } |
| 649 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 650 | /* Re-bind in session stage only */ |
| 651 | if (stage_session(sp->sa_addr.pppoe.sid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | error = -ENODEV; |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 653 | net = sock_net(sk); |
| 654 | dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | if (!dev) |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 656 | goto err_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
| 658 | po->pppoe_dev = dev; |
Florian Zumbiehl | 6f30e18 | 2007-03-04 16:03:22 -0800 | [diff] [blame] | 659 | po->pppoe_ifindex = dev->ifindex; |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 660 | pn = pppoe_pernet(net); |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 661 | if (!(dev->flags & IFF_UP)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | goto err_put; |
Florian Zumbiehl | 74b885c | 2007-04-20 16:57:27 -0700 | [diff] [blame] | 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | memcpy(&po->pppoe_pa, |
| 666 | &sp->sa_addr.pppoe, |
| 667 | sizeof(struct pppoe_addr)); |
| 668 | |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 669 | write_lock_bh(&pn->hash_lock); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 670 | error = __set_item(pn, po); |
| 671 | write_unlock_bh(&pn->hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | if (error < 0) |
| 673 | goto err_put; |
| 674 | |
| 675 | po->chan.hdrlen = (sizeof(struct pppoe_hdr) + |
| 676 | dev->hard_header_len); |
| 677 | |
Michal Ostrowski | c9aa689 | 2006-09-27 16:11:25 -0700 | [diff] [blame] | 678 | po->chan.mtu = dev->mtu - sizeof(struct pppoe_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | po->chan.private = sk; |
| 680 | po->chan.ops = &pppoe_chan_ops; |
| 681 | |
Cyrill Gorcunov | f5882c3 | 2009-01-21 15:55:40 -0800 | [diff] [blame] | 682 | error = ppp_register_net_channel(dev_net(dev), &po->chan); |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 683 | if (error) { |
| 684 | delete_item(pn, po->pppoe_pa.sid, |
| 685 | po->pppoe_pa.remote, po->pppoe_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | goto err_put; |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 687 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
| 689 | sk->sk_state = PPPOX_CONNECTED; |
| 690 | } |
| 691 | |
| 692 | po->num = sp->sa_addr.pppoe.sid; |
| 693 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 694 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | release_sock(sk); |
| 696 | return error; |
| 697 | err_put: |
| 698 | if (po->pppoe_dev) { |
| 699 | dev_put(po->pppoe_dev); |
| 700 | po->pppoe_dev = NULL; |
| 701 | } |
| 702 | goto end; |
| 703 | } |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | static int pppoe_getname(struct socket *sock, struct sockaddr *uaddr, |
| 706 | int *usockaddr_len, int peer) |
| 707 | { |
| 708 | int len = sizeof(struct sockaddr_pppox); |
| 709 | struct sockaddr_pppox sp; |
| 710 | |
| 711 | sp.sa_family = AF_PPPOX; |
| 712 | sp.sa_protocol = PX_PROTO_OE; |
| 713 | memcpy(&sp.sa_addr.pppoe, &pppox_sk(sock->sk)->pppoe_pa, |
| 714 | sizeof(struct pppoe_addr)); |
| 715 | |
| 716 | memcpy(uaddr, &sp, len); |
| 717 | |
| 718 | *usockaddr_len = len; |
| 719 | |
| 720 | return 0; |
| 721 | } |
| 722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | static int pppoe_ioctl(struct socket *sock, unsigned int cmd, |
| 724 | unsigned long arg) |
| 725 | { |
| 726 | struct sock *sk = sock->sk; |
| 727 | struct pppox_sock *po = pppox_sk(sk); |
Florian Zumbiehl | 86c1dcf | 2007-07-30 17:48:23 -0700 | [diff] [blame] | 728 | int val; |
| 729 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
| 731 | switch (cmd) { |
| 732 | case PPPIOCGMRU: |
| 733 | err = -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
| 735 | break; |
| 736 | |
| 737 | err = -EFAULT; |
| 738 | if (put_user(po->pppoe_dev->mtu - |
| 739 | sizeof(struct pppoe_hdr) - |
| 740 | PPP_HDRLEN, |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 741 | (int __user *)arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | break; |
| 743 | err = 0; |
| 744 | break; |
| 745 | |
| 746 | case PPPIOCSMRU: |
| 747 | err = -ENXIO; |
| 748 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
| 749 | break; |
| 750 | |
| 751 | err = -EFAULT; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 752 | if (get_user(val, (int __user *)arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | break; |
| 754 | |
| 755 | if (val < (po->pppoe_dev->mtu |
| 756 | - sizeof(struct pppoe_hdr) |
| 757 | - PPP_HDRLEN)) |
| 758 | err = 0; |
| 759 | else |
| 760 | err = -EINVAL; |
| 761 | break; |
| 762 | |
| 763 | case PPPIOCSFLAGS: |
| 764 | err = -EFAULT; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 765 | if (get_user(val, (int __user *)arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | break; |
| 767 | err = 0; |
| 768 | break; |
| 769 | |
| 770 | case PPPOEIOCSFWD: |
| 771 | { |
| 772 | struct pppox_sock *relay_po; |
| 773 | |
| 774 | err = -EBUSY; |
| 775 | if (sk->sk_state & (PPPOX_BOUND | PPPOX_ZOMBIE | PPPOX_DEAD)) |
| 776 | break; |
| 777 | |
| 778 | err = -ENOTCONN; |
| 779 | if (!(sk->sk_state & PPPOX_CONNECTED)) |
| 780 | break; |
| 781 | |
| 782 | /* PPPoE address from the user specifies an outbound |
Florian Zumbiehl | 90719db | 2007-03-02 13:16:56 -0800 | [diff] [blame] | 783 | PPPoE address which frames are forwarded to */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | err = -EFAULT; |
| 785 | if (copy_from_user(&po->pppoe_relay, |
| 786 | (void __user *)arg, |
| 787 | sizeof(struct sockaddr_pppox))) |
| 788 | break; |
| 789 | |
| 790 | err = -EINVAL; |
| 791 | if (po->pppoe_relay.sa_family != AF_PPPOX || |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 792 | po->pppoe_relay.sa_protocol != PX_PROTO_OE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | break; |
| 794 | |
| 795 | /* Check that the socket referenced by the address |
| 796 | actually exists. */ |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 797 | relay_po = get_item_by_addr(sock_net(sk), &po->pppoe_relay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | if (!relay_po) |
| 799 | break; |
| 800 | |
| 801 | sock_put(sk_pppox(relay_po)); |
| 802 | sk->sk_state |= PPPOX_RELAY; |
| 803 | err = 0; |
| 804 | break; |
| 805 | } |
| 806 | |
| 807 | case PPPOEIOCDFWD: |
| 808 | err = -EALREADY; |
| 809 | if (!(sk->sk_state & PPPOX_RELAY)) |
| 810 | break; |
| 811 | |
| 812 | sk->sk_state &= ~PPPOX_RELAY; |
| 813 | err = 0; |
| 814 | break; |
| 815 | |
Florian Zumbiehl | 86c1dcf | 2007-07-30 17:48:23 -0700 | [diff] [blame] | 816 | default: |
| 817 | err = -ENOTTY; |
| 818 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | return err; |
| 821 | } |
| 822 | |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 823 | static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | struct msghdr *m, size_t total_len) |
| 825 | { |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 826 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | struct sock *sk = sock->sk; |
| 828 | struct pppox_sock *po = pppox_sk(sk); |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 829 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | struct pppoe_hdr hdr; |
| 831 | struct pppoe_hdr *ph; |
| 832 | struct net_device *dev; |
| 833 | char *start; |
| 834 | |
Florian Zumbiehl | 8aeca8f | 2007-07-30 17:49:13 -0700 | [diff] [blame] | 835 | lock_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) { |
| 837 | error = -ENOTCONN; |
| 838 | goto end; |
| 839 | } |
| 840 | |
| 841 | hdr.ver = 1; |
| 842 | hdr.type = 1; |
| 843 | hdr.code = 0; |
| 844 | hdr.sid = po->num; |
| 845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | dev = po->pppoe_dev; |
| 847 | |
| 848 | error = -EMSGSIZE; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 849 | if (total_len > (dev->mtu + dev->hard_header_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | goto end; |
| 851 | |
| 852 | |
| 853 | skb = sock_wmalloc(sk, total_len + dev->hard_header_len + 32, |
| 854 | 0, GFP_KERNEL); |
| 855 | if (!skb) { |
| 856 | error = -ENOMEM; |
| 857 | goto end; |
| 858 | } |
| 859 | |
| 860 | /* Reserve space for headers. */ |
| 861 | skb_reserve(skb, dev->hard_header_len); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 862 | skb_reset_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | skb->dev = dev; |
| 865 | |
| 866 | skb->priority = sk->sk_priority; |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 867 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 869 | ph = (struct pppoe_hdr *)skb_put(skb, total_len + sizeof(struct pppoe_hdr)); |
| 870 | start = (char *)&ph->tag[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
| 872 | error = memcpy_fromiovec(start, m->msg_iov, total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | if (error < 0) { |
| 874 | kfree_skb(skb); |
| 875 | goto end; |
| 876 | } |
| 877 | |
| 878 | error = total_len; |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 879 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
| 880 | po->pppoe_pa.remote, NULL, total_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
| 882 | memcpy(ph, &hdr, sizeof(struct pppoe_hdr)); |
| 883 | |
| 884 | ph->length = htons(total_len); |
| 885 | |
| 886 | dev_queue_xmit(skb); |
| 887 | |
| 888 | end: |
| 889 | release_sock(sk); |
| 890 | return error; |
| 891 | } |
| 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | /************************************************************************ |
| 894 | * |
| 895 | * xmit function for internal use. |
| 896 | * |
| 897 | ***********************************************************************/ |
| 898 | static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb) |
| 899 | { |
| 900 | struct pppox_sock *po = pppox_sk(sk); |
| 901 | struct net_device *dev = po->pppoe_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | struct pppoe_hdr *ph; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | int data_len = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
Michal Ostrowski | fb64bb5 | 2009-10-26 16:23:20 -0700 | [diff] [blame] | 905 | /* The higher-level PPP code (ppp_unregister_channel()) ensures the PPP |
| 906 | * xmit operations conclude prior to an unregistration call. Thus |
| 907 | * sk->sk_state cannot change, so we don't need to do lock_sock(). |
| 908 | * But, we also can't do a lock_sock since that introduces a potential |
| 909 | * deadlock as we'd reverse the lock ordering used when calling |
| 910 | * ppp_unregister_channel(). |
| 911 | */ |
| 912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) |
| 914 | goto abort; |
| 915 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | if (!dev) |
| 917 | goto abort; |
| 918 | |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 919 | /* Copy the data if there is no space for the header or if it's |
| 920 | * read-only. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | */ |
Herbert Xu | d9cc204 | 2007-09-16 16:21:16 -0700 | [diff] [blame] | 922 | if (skb_cow_head(skb, sizeof(*ph) + dev->hard_header_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | goto abort; |
| 924 | |
Herbert Xu | 9355ec2 | 2007-09-16 16:20:21 -0700 | [diff] [blame] | 925 | __skb_push(skb, sizeof(*ph)); |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 926 | skb_reset_network_header(skb); |
| 927 | |
Herbert Xu | 9355ec2 | 2007-09-16 16:20:21 -0700 | [diff] [blame] | 928 | ph = pppoe_hdr(skb); |
| 929 | ph->ver = 1; |
| 930 | ph->type = 1; |
| 931 | ph->code = 0; |
| 932 | ph->sid = po->num; |
| 933 | ph->length = htons(data_len); |
| 934 | |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 935 | skb->protocol = cpu_to_be16(ETH_P_PPP_SES); |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 936 | skb->dev = dev; |
| 937 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 938 | dev_hard_header(skb, dev, ETH_P_PPP_SES, |
| 939 | po->pppoe_pa.remote, NULL, data_len); |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 940 | |
Herbert Xu | 21d0c83 | 2007-09-19 10:45:02 -0700 | [diff] [blame] | 941 | dev_queue_xmit(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | return 1; |
| 943 | |
| 944 | abort: |
Herbert Xu | db7bf6d | 2007-09-16 16:19:50 -0700 | [diff] [blame] | 945 | kfree_skb(skb); |
Andrej Ota | 2a27a03 | 2010-12-12 15:06:16 -0800 | [diff] [blame] | 946 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |
| 948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | /************************************************************************ |
| 950 | * |
| 951 | * xmit function called by generic PPP driver |
| 952 | * sends PPP frame over PPPoE socket |
| 953 | * |
| 954 | ***********************************************************************/ |
| 955 | static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb) |
| 956 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 957 | struct sock *sk = (struct sock *)chan->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | return __pppoe_xmit(sk, skb); |
| 959 | } |
| 960 | |
stephen hemminger | d7100da | 2010-08-04 07:34:36 +0000 | [diff] [blame] | 961 | static const struct ppp_channel_ops pppoe_chan_ops = { |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 962 | .start_xmit = pppoe_xmit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | }; |
| 964 | |
| 965 | static int pppoe_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 966 | struct msghdr *m, size_t total_len, int flags) |
| 967 | { |
| 968 | struct sock *sk = sock->sk; |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 969 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | |
| 972 | if (sk->sk_state & PPPOX_BOUND) { |
| 973 | error = -EIO; |
| 974 | goto end; |
| 975 | } |
| 976 | |
| 977 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, |
| 978 | flags & MSG_DONTWAIT, &error); |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 979 | if (error < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | goto end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
| 982 | m->msg_namelen = 0; |
| 983 | |
| 984 | if (skb) { |
Stephen Hemminger | 2645a3c | 2008-06-20 21:58:02 -0700 | [diff] [blame] | 985 | total_len = min_t(size_t, total_len, skb->len); |
Herbert Xu | 392fdb0 | 2008-06-10 14:07:25 -0700 | [diff] [blame] | 986 | error = skb_copy_datagram_iovec(skb, 0, m->msg_iov, total_len); |
Eric Dumazet | 968d701 | 2012-05-18 20:23:00 +0000 | [diff] [blame] | 987 | if (error == 0) { |
| 988 | consume_skb(skb); |
| 989 | return total_len; |
| 990 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | } |
| 992 | |
Arnaldo Carvalho de Melo | 797659f | 2007-03-10 15:56:08 -0300 | [diff] [blame] | 993 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | end: |
| 995 | return error; |
| 996 | } |
| 997 | |
| 998 | #ifdef CONFIG_PROC_FS |
| 999 | static int pppoe_seq_show(struct seq_file *seq, void *v) |
| 1000 | { |
| 1001 | struct pppox_sock *po; |
| 1002 | char *dev_name; |
| 1003 | |
| 1004 | if (v == SEQ_START_TOKEN) { |
| 1005 | seq_puts(seq, "Id Address Device\n"); |
| 1006 | goto out; |
| 1007 | } |
| 1008 | |
| 1009 | po = v; |
| 1010 | dev_name = po->pppoe_pa.dev; |
| 1011 | |
Johannes Berg | e174961 | 2008-10-27 15:59:26 -0700 | [diff] [blame] | 1012 | seq_printf(seq, "%08X %pM %8s\n", |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1013 | po->pppoe_pa.sid, po->pppoe_pa.remote, dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | out: |
| 1015 | return 0; |
| 1016 | } |
| 1017 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1018 | static inline struct pppox_sock *pppoe_get_idx(struct pppoe_net *pn, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | { |
Florian Zumbiehl | bfafb26 | 2007-04-20 16:56:31 -0700 | [diff] [blame] | 1020 | struct pppox_sock *po; |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 1021 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 1023 | for (i = 0; i < PPPOE_HASH_SIZE; i++) { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1024 | po = pn->hash_table[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | while (po) { |
| 1026 | if (!pos--) |
| 1027 | goto out; |
| 1028 | po = po->next; |
| 1029 | } |
| 1030 | } |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | out: |
| 1033 | return po; |
| 1034 | } |
| 1035 | |
| 1036 | static void *pppoe_seq_start(struct seq_file *seq, loff_t *pos) |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1037 | __acquires(pn->hash_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | { |
Cyrill Gorcunov | 3617aa4 | 2009-01-26 21:11:02 -0800 | [diff] [blame] | 1039 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | loff_t l = *pos; |
| 1041 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1042 | read_lock_bh(&pn->hash_lock); |
| 1043 | return l ? pppoe_get_idx(pn, --l) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | } |
| 1045 | |
| 1046 | static void *pppoe_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1047 | { |
Cyrill Gorcunov | 3617aa4 | 2009-01-26 21:11:02 -0800 | [diff] [blame] | 1048 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | struct pppox_sock *po; |
| 1050 | |
| 1051 | ++*pos; |
| 1052 | if (v == SEQ_START_TOKEN) { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1053 | po = pppoe_get_idx(pn, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | goto out; |
| 1055 | } |
| 1056 | po = v; |
Jeff Garzik | 6aa20a2 | 2006-09-13 13:24:59 -0400 | [diff] [blame] | 1057 | if (po->next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | po = po->next; |
| 1059 | else { |
| 1060 | int hash = hash_item(po->pppoe_pa.sid, po->pppoe_pa.remote); |
| 1061 | |
Eric Dumazet | 72fc939 | 2009-07-28 23:43:08 +0000 | [diff] [blame] | 1062 | po = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | while (++hash < PPPOE_HASH_SIZE) { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1064 | po = pn->hash_table[hash]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | if (po) |
| 1066 | break; |
| 1067 | } |
| 1068 | } |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1069 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | out: |
| 1071 | return po; |
| 1072 | } |
| 1073 | |
| 1074 | static void pppoe_seq_stop(struct seq_file *seq, void *v) |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1075 | __releases(pn->hash_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | { |
Cyrill Gorcunov | 3617aa4 | 2009-01-26 21:11:02 -0800 | [diff] [blame] | 1077 | struct pppoe_net *pn = pppoe_pernet(seq_file_net(seq)); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1078 | read_unlock_bh(&pn->hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | } |
| 1080 | |
Jan Engelhardt | 4101dec | 2009-01-14 13:52:18 -0800 | [diff] [blame] | 1081 | static const struct seq_operations pppoe_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | .start = pppoe_seq_start, |
| 1083 | .next = pppoe_seq_next, |
| 1084 | .stop = pppoe_seq_stop, |
| 1085 | .show = pppoe_seq_show, |
| 1086 | }; |
| 1087 | |
| 1088 | static int pppoe_seq_open(struct inode *inode, struct file *file) |
| 1089 | { |
Cyrill Gorcunov | 3617aa4 | 2009-01-26 21:11:02 -0800 | [diff] [blame] | 1090 | return seq_open_net(inode, file, &pppoe_seq_ops, |
| 1091 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | } |
| 1093 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1094 | static const struct file_operations pppoe_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | .owner = THIS_MODULE, |
| 1096 | .open = pppoe_seq_open, |
| 1097 | .read = seq_read, |
| 1098 | .llseek = seq_lseek, |
Cyrill Gorcunov | 3617aa4 | 2009-01-26 21:11:02 -0800 | [diff] [blame] | 1099 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | }; |
| 1101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | #endif /* CONFIG_PROC_FS */ |
| 1103 | |
David S. Miller | 17ba15f | 2005-12-27 20:57:40 -0800 | [diff] [blame] | 1104 | static const struct proto_ops pppoe_ops = { |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 1105 | .family = AF_PPPOX, |
| 1106 | .owner = THIS_MODULE, |
| 1107 | .release = pppoe_release, |
| 1108 | .bind = sock_no_bind, |
| 1109 | .connect = pppoe_connect, |
| 1110 | .socketpair = sock_no_socketpair, |
| 1111 | .accept = sock_no_accept, |
| 1112 | .getname = pppoe_getname, |
| 1113 | .poll = datagram_poll, |
| 1114 | .listen = sock_no_listen, |
| 1115 | .shutdown = sock_no_shutdown, |
| 1116 | .setsockopt = sock_no_setsockopt, |
| 1117 | .getsockopt = sock_no_getsockopt, |
| 1118 | .sendmsg = pppoe_sendmsg, |
| 1119 | .recvmsg = pppoe_recvmsg, |
| 1120 | .mmap = sock_no_mmap, |
| 1121 | .ioctl = pppox_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | }; |
| 1123 | |
Eric Dumazet | 756e64a | 2010-09-21 06:43:54 +0000 | [diff] [blame] | 1124 | static const struct pppox_proto pppoe_proto = { |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 1125 | .create = pppoe_create, |
| 1126 | .ioctl = pppoe_ioctl, |
| 1127 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | }; |
| 1129 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1130 | static __net_init int pppoe_init_net(struct net *net) |
| 1131 | { |
Eric W. Biederman | c879a6f | 2009-11-29 15:46:10 +0000 | [diff] [blame] | 1132 | struct pppoe_net *pn = pppoe_pernet(net); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1133 | struct proc_dir_entry *pde; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1134 | |
| 1135 | rwlock_init(&pn->hash_lock); |
| 1136 | |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1137 | pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops); |
| 1138 | #ifdef CONFIG_PROC_FS |
Eric W. Biederman | c879a6f | 2009-11-29 15:46:10 +0000 | [diff] [blame] | 1139 | if (!pde) |
| 1140 | return -ENOMEM; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1141 | #endif |
| 1142 | |
| 1143 | return 0; |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1144 | } |
| 1145 | |
| 1146 | static __net_exit void pppoe_exit_net(struct net *net) |
| 1147 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1148 | proc_net_remove(net, "pppoe"); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1149 | } |
| 1150 | |
Alexey Dobriyan | 0012985 | 2009-02-09 18:05:16 -0800 | [diff] [blame] | 1151 | static struct pernet_operations pppoe_net_ops = { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1152 | .init = pppoe_init_net, |
| 1153 | .exit = pppoe_exit_net, |
Eric W. Biederman | c879a6f | 2009-11-29 15:46:10 +0000 | [diff] [blame] | 1154 | .id = &pppoe_net_id, |
| 1155 | .size = sizeof(struct pppoe_net), |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1156 | }; |
| 1157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | static int __init pppoe_init(void) |
| 1159 | { |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1160 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | |
Eric W. Biederman | c879a6f | 2009-11-29 15:46:10 +0000 | [diff] [blame] | 1162 | err = register_pernet_device(&pppoe_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | if (err) |
| 1164 | goto out; |
| 1165 | |
Cyrill Gorcunov | 07f6642 | 2009-08-12 16:39:16 -0700 | [diff] [blame] | 1166 | err = proto_register(&pppoe_sk_proto, 0); |
| 1167 | if (err) |
| 1168 | goto out_unregister_net_ops; |
| 1169 | |
Cyrill Gorcunov | 6aba915 | 2009-01-21 15:54:15 -0800 | [diff] [blame] | 1170 | err = register_pppox_proto(PX_PROTO_OE, &pppoe_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | if (err) |
| 1172 | goto out_unregister_pppoe_proto; |
| 1173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | dev_add_pack(&pppoes_ptype); |
| 1175 | dev_add_pack(&pppoed_ptype); |
| 1176 | register_netdevice_notifier(&pppoe_notifier); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1177 | |
| 1178 | return 0; |
| 1179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | out_unregister_pppoe_proto: |
| 1181 | proto_unregister(&pppoe_sk_proto); |
Cyrill Gorcunov | 07f6642 | 2009-08-12 16:39:16 -0700 | [diff] [blame] | 1182 | out_unregister_net_ops: |
Eric W. Biederman | c879a6f | 2009-11-29 15:46:10 +0000 | [diff] [blame] | 1183 | unregister_pernet_device(&pppoe_net_ops); |
Cyrill Gorcunov | a6bcf1c | 2009-01-21 15:54:54 -0800 | [diff] [blame] | 1184 | out: |
| 1185 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | } |
| 1187 | |
| 1188 | static void __exit pppoe_exit(void) |
| 1189 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | unregister_netdevice_notifier(&pppoe_notifier); |
Cyrill Gorcunov | 07f6642 | 2009-08-12 16:39:16 -0700 | [diff] [blame] | 1191 | dev_remove_pack(&pppoed_ptype); |
| 1192 | dev_remove_pack(&pppoes_ptype); |
| 1193 | unregister_pppox_proto(PX_PROTO_OE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | proto_unregister(&pppoe_sk_proto); |
Eric W. Biederman | c879a6f | 2009-11-29 15:46:10 +0000 | [diff] [blame] | 1195 | unregister_pernet_device(&pppoe_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | } |
| 1197 | |
| 1198 | module_init(pppoe_init); |
| 1199 | module_exit(pppoe_exit); |
| 1200 | |
| 1201 | MODULE_AUTHOR("Michal Ostrowski <mostrows@speakeasy.net>"); |
| 1202 | MODULE_DESCRIPTION("PPP over Ethernet driver"); |
| 1203 | MODULE_LICENSE("GPL"); |
| 1204 | MODULE_ALIAS_NETPROTO(PF_PPPOX); |