Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * af_llc.c - LLC User Interface SAPs |
| 3 | * Description: |
| 4 | * Functions in this module are implementation of socket based llc |
| 5 | * communications for the Linux operating system. Support of llc class |
| 6 | * one and class two is provided via SOCK_DGRAM and SOCK_STREAM |
| 7 | * respectively. |
| 8 | * |
| 9 | * An llc2 connection is (mac + sap), only one llc2 sap connection |
| 10 | * is allowed per mac. Though one sap may have multiple mac + sap |
| 11 | * connections. |
| 12 | * |
| 13 | * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org> |
| 14 | * 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 15 | * |
| 16 | * This program can be redistributed or modified under the terms of the |
| 17 | * GNU General Public License as published by the Free Software Foundation. |
| 18 | * This program is distributed without any warranty or implied warranty |
| 19 | * of merchantability or fitness for a particular purpose. |
| 20 | * |
| 21 | * See the GNU General Public License for more details. |
| 22 | */ |
Arnaldo Carvalho de Melo | 6e2144b | 2005-09-22 04:43:05 -0300 | [diff] [blame] | 23 | #include <linux/compiler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/kernel.h> |
| 25 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/rtnetlink.h> |
| 27 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <net/llc.h> |
| 30 | #include <net/llc_sap.h> |
| 31 | #include <net/llc_pdu.h> |
| 32 | #include <net/llc_conn.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 33 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | /* remember: uninitialized global data is zeroed because its in .bss */ |
| 36 | static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
| 37 | static u16 llc_ui_sap_link_no_max[256]; |
| 38 | static struct sockaddr_llc llc_ui_addrnull; |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 39 | static const struct proto_ops llc_ui_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 41 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout); |
| 42 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout); |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 43 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #if 0 |
| 46 | #define dprintk(args...) printk(KERN_DEBUG args) |
| 47 | #else |
| 48 | #define dprintk(args...) |
| 49 | #endif |
| 50 | |
Octavian Purdila | e5cd6fe | 2009-12-26 11:51:00 +0000 | [diff] [blame] | 51 | /* Maybe we'll add some more in the future. */ |
| 52 | #define LLC_CMSG_PKTINFO 1 |
| 53 | |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | /** |
| 56 | * llc_ui_next_link_no - return the next unused link number for a sap |
| 57 | * @sap: Address of sap to get link number from. |
| 58 | * |
| 59 | * Return the next unused link number for a given sap. |
| 60 | */ |
Arnaldo Carvalho de Melo | 2342c99 | 2006-03-20 21:27:43 -0800 | [diff] [blame] | 61 | static inline u16 llc_ui_next_link_no(int sap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
| 63 | return llc_ui_sap_link_no_max[sap]++; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * llc_proto_type - return eth protocol for ARP header type |
| 68 | * @arphrd: ARP header type. |
| 69 | * |
| 70 | * Given an ARP header type return the corresponding ethernet protocol. |
| 71 | */ |
Al Viro | 3fbd418 | 2006-11-08 00:26:05 -0800 | [diff] [blame] | 72 | static inline __be16 llc_proto_type(u16 arphrd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
Paul Gortmaker | 211ed86 | 2012-05-10 17:14:35 -0400 | [diff] [blame] | 74 | return htons(ETH_P_802_2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | /** |
| 78 | * llc_ui_addr_null - determines if a address structure is null |
| 79 | * @addr: Address to test if null. |
| 80 | */ |
Arnaldo Carvalho de Melo | 2342c99 | 2006-03-20 21:27:43 -0800 | [diff] [blame] | 81 | static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | { |
| 83 | return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr)); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * llc_ui_header_len - return length of llc header based on operation |
| 88 | * @sk: Socket which contains a valid llc socket type. |
| 89 | * @addr: Complete sockaddr_llc structure received from the user. |
| 90 | * |
| 91 | * Provide the length of the llc header depending on what kind of |
| 92 | * operation the user would like to perform and the type of socket. |
| 93 | * Returns the correct llc header length. |
| 94 | */ |
Arnaldo Carvalho de Melo | 2342c99 | 2006-03-20 21:27:43 -0800 | [diff] [blame] | 95 | static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | u8 rc = LLC_PDU_LEN_U; |
| 98 | |
| 99 | if (addr->sllc_test || addr->sllc_xid) |
| 100 | rc = LLC_PDU_LEN_U; |
| 101 | else if (sk->sk_type == SOCK_STREAM) |
| 102 | rc = LLC_PDU_LEN_I; |
| 103 | return rc; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * llc_ui_send_data - send data via reliable llc2 connection |
| 108 | * @sk: Connection the socket is using. |
| 109 | * @skb: Data the user wishes to send. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | * @noblock: can we block waiting for data? |
| 111 | * |
| 112 | * Send data via reliable llc2 connection. |
| 113 | * Returns 0 upon success, non-zero if action did not succeed. |
| 114 | */ |
| 115 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) |
| 116 | { |
| 117 | struct llc_sock* llc = llc_sk(sk); |
| 118 | int rc = 0; |
| 119 | |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 120 | if (unlikely(llc_data_accept_state(llc->state) || |
Jochen Friedrich | 451677c | 2005-11-14 21:57:46 -0800 | [diff] [blame] | 121 | llc->remote_busy_flag || |
| 122 | llc->p_flag)) { |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 123 | long timeout = sock_sndtimeo(sk, noblock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | rc = llc_ui_wait_for_busy_core(sk, timeout); |
| 126 | } |
Arnaldo Carvalho de Melo | 249ff1c | 2005-09-22 04:32:10 -0300 | [diff] [blame] | 127 | if (unlikely(!rc)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | rc = llc_build_and_send_pkt(sk, skb); |
| 129 | return rc; |
| 130 | } |
| 131 | |
| 132 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) |
| 133 | { |
David S. Miller | ee5850d | 2008-06-17 01:21:03 -0700 | [diff] [blame] | 134 | sock_graft(sk, sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | sk->sk_type = sock->type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | sock->ops = &llc_ui_ops; |
| 137 | } |
| 138 | |
| 139 | static struct proto llc_proto = { |
Arnaldo Carvalho de Melo | 9c005e0 | 2006-03-20 21:27:23 -0800 | [diff] [blame] | 140 | .name = "LLC", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | .owner = THIS_MODULE, |
| 142 | .obj_size = sizeof(struct llc_sock), |
Octavian Purdila | b76f5a8 | 2009-12-26 11:51:02 +0000 | [diff] [blame] | 143 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | }; |
| 145 | |
| 146 | /** |
| 147 | * llc_ui_create - alloc and init a new llc_ui socket |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 148 | * @net: network namespace (must be default network) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | * @sock: Socket to initialize and attach allocated sk to. |
| 150 | * @protocol: Unused. |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 151 | * @kern: on behalf of kernel or userspace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | * |
| 153 | * Allocate and initialize a new llc_ui socket, validate the user wants a |
| 154 | * socket type we have available. |
| 155 | * Returns 0 upon success, negative upon failure. |
| 156 | */ |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 157 | static int llc_ui_create(struct net *net, struct socket *sock, int protocol, |
| 158 | int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
| 160 | struct sock *sk; |
| 161 | int rc = -ESOCKTNOSUPPORT; |
| 162 | |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 163 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
Patrick McHardy | 3480c63 | 2008-03-27 20:28:10 -0700 | [diff] [blame] | 164 | return -EPERM; |
| 165 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 166 | if (!net_eq(net, &init_net)) |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 167 | return -EAFNOSUPPORT; |
| 168 | |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 169 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | rc = -ENOMEM; |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 171 | sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | if (sk) { |
| 173 | rc = 0; |
| 174 | llc_ui_sk_init(sock, sk); |
| 175 | } |
| 176 | } |
| 177 | return rc; |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * llc_ui_release - shutdown socket |
| 182 | * @sock: Socket to release. |
| 183 | * |
| 184 | * Shutdown and deallocate an existing socket. |
| 185 | */ |
| 186 | static int llc_ui_release(struct socket *sock) |
| 187 | { |
| 188 | struct sock *sk = sock->sk; |
| 189 | struct llc_sock *llc; |
| 190 | |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 191 | if (unlikely(sk == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | goto out; |
| 193 | sock_hold(sk); |
| 194 | lock_sock(sk); |
| 195 | llc = llc_sk(sk); |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 196 | dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | llc->laddr.lsap, llc->daddr.lsap); |
| 198 | if (!llc_send_disc(sk)) |
| 199 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); |
Octavian Purdila | 3100aa9 | 2009-12-26 11:51:08 +0000 | [diff] [blame] | 200 | if (!sock_flag(sk, SOCK_ZAPPED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | llc_sap_remove_socket(llc->sap, sk); |
| 202 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | if (llc->dev) |
| 204 | dev_put(llc->dev); |
| 205 | sock_put(sk); |
| 206 | llc_sk_free(sk); |
| 207 | out: |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * llc_ui_autoport - provide dynamically allocate SAP number |
| 213 | * |
| 214 | * Provide the caller with a dynamically allocated SAP number according |
| 215 | * to the rules that are set in this function. Returns: 0, upon failure, |
| 216 | * SAP number otherwise. |
| 217 | */ |
| 218 | static int llc_ui_autoport(void) |
| 219 | { |
| 220 | struct llc_sap *sap; |
| 221 | int i, tries = 0; |
| 222 | |
| 223 | while (tries < LLC_SAP_DYN_TRIES) { |
| 224 | for (i = llc_ui_sap_last_autoport; |
| 225 | i < LLC_SAP_DYN_STOP; i += 2) { |
| 226 | sap = llc_sap_find(i); |
| 227 | if (!sap) { |
| 228 | llc_ui_sap_last_autoport = i + 2; |
| 229 | goto out; |
| 230 | } |
Arnaldo Carvalho de Melo | 6e2144b | 2005-09-22 04:43:05 -0300 | [diff] [blame] | 231 | llc_sap_put(sap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | } |
| 233 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
| 234 | tries++; |
| 235 | } |
| 236 | i = 0; |
| 237 | out: |
| 238 | return i; |
| 239 | } |
| 240 | |
| 241 | /** |
Arnaldo Carvalho de Melo | 5a770c0 | 2005-09-22 03:56:26 -0300 | [diff] [blame] | 242 | * llc_ui_autobind - automatically bind a socket to a sap |
| 243 | * @sock: socket to bind |
| 244 | * @addr: address to connect to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | * |
Arnaldo Carvalho de Melo | 5a770c0 | 2005-09-22 03:56:26 -0300 | [diff] [blame] | 246 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't |
| 247 | * specifically used llc_ui_bind to bind to an specific address/sap |
| 248 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | * Returns: 0 upon success, negative otherwise. |
| 250 | */ |
| 251 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) |
| 252 | { |
| 253 | struct sock *sk = sock->sk; |
| 254 | struct llc_sock *llc = llc_sk(sk); |
| 255 | struct llc_sap *sap; |
| 256 | int rc = -EINVAL; |
| 257 | |
| 258 | if (!sock_flag(sk, SOCK_ZAPPED)) |
| 259 | goto out; |
| 260 | rc = -ENODEV; |
Octavian Purdila | abf9d53 | 2009-12-26 11:51:01 +0000 | [diff] [blame] | 261 | if (sk->sk_bound_dev_if) { |
| 262 | llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); |
| 263 | if (llc->dev && addr->sllc_arphrd != llc->dev->type) { |
| 264 | dev_put(llc->dev); |
| 265 | llc->dev = NULL; |
| 266 | } |
| 267 | } else |
| 268 | llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | if (!llc->dev) |
| 270 | goto out; |
| 271 | rc = -EUSERS; |
| 272 | llc->laddr.lsap = llc_ui_autoport(); |
| 273 | if (!llc->laddr.lsap) |
| 274 | goto out; |
| 275 | rc = -EBUSY; /* some other network layer is using the sap */ |
| 276 | sap = llc_sap_open(llc->laddr.lsap, NULL); |
| 277 | if (!sap) |
| 278 | goto out; |
| 279 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); |
| 280 | memcpy(&llc->addr, addr, sizeof(llc->addr)); |
| 281 | /* assign new connection to its SAP */ |
| 282 | llc_sap_add_socket(sap, sk); |
| 283 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 284 | rc = 0; |
| 285 | out: |
| 286 | return rc; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * llc_ui_bind - bind a socket to a specific address. |
| 291 | * @sock: Socket to bind an address to. |
| 292 | * @uaddr: Address the user wants the socket bound to. |
| 293 | * @addrlen: Length of the uaddr structure. |
| 294 | * |
| 295 | * Bind a socket to a specific address. For llc a user is able to bind to |
Arnaldo Carvalho de Melo | 5a770c0 | 2005-09-22 03:56:26 -0300 | [diff] [blame] | 296 | * a specific sap only or mac + sap. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | * If the user desires to bind to a specific mac + sap, it is possible to |
| 298 | * have multiple sap connections via multiple macs. |
| 299 | * Bind and autobind for that matter must enforce the correct sap usage |
| 300 | * otherwise all hell will break loose. |
| 301 | * Returns: 0 upon success, negative otherwise. |
| 302 | */ |
| 303 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) |
| 304 | { |
| 305 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; |
| 306 | struct sock *sk = sock->sk; |
| 307 | struct llc_sock *llc = llc_sk(sk); |
| 308 | struct llc_sap *sap; |
| 309 | int rc = -EINVAL; |
| 310 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 311 | dprintk("%s: binding %02X\n", __func__, addr->sllc_sap); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 312 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | goto out; |
| 314 | rc = -EAFNOSUPPORT; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 315 | if (unlikely(addr->sllc_family != AF_LLC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | goto out; |
Jochen Friedrich | cf309e3 | 2005-09-22 04:44:55 -0300 | [diff] [blame] | 317 | rc = -ENODEV; |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 318 | rcu_read_lock(); |
Octavian Purdila | abf9d53 | 2009-12-26 11:51:01 +0000 | [diff] [blame] | 319 | if (sk->sk_bound_dev_if) { |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 320 | llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if); |
Octavian Purdila | abf9d53 | 2009-12-26 11:51:01 +0000 | [diff] [blame] | 321 | if (llc->dev) { |
| 322 | if (!addr->sllc_arphrd) |
| 323 | addr->sllc_arphrd = llc->dev->type; |
Joe Perches | 951fd87 | 2013-09-01 13:11:55 -0700 | [diff] [blame] | 324 | if (is_zero_ether_addr(addr->sllc_mac)) |
Octavian Purdila | abf9d53 | 2009-12-26 11:51:01 +0000 | [diff] [blame] | 325 | memcpy(addr->sllc_mac, llc->dev->dev_addr, |
| 326 | IFHWADDRLEN); |
| 327 | if (addr->sllc_arphrd != llc->dev->type || |
Joe Perches | 951fd87 | 2013-09-01 13:11:55 -0700 | [diff] [blame] | 328 | !ether_addr_equal(addr->sllc_mac, |
| 329 | llc->dev->dev_addr)) { |
Octavian Purdila | abf9d53 | 2009-12-26 11:51:01 +0000 | [diff] [blame] | 330 | rc = -EINVAL; |
Octavian Purdila | abf9d53 | 2009-12-26 11:51:01 +0000 | [diff] [blame] | 331 | llc->dev = NULL; |
| 332 | } |
| 333 | } |
| 334 | } else |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 335 | llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd, |
Octavian Purdila | abf9d53 | 2009-12-26 11:51:01 +0000 | [diff] [blame] | 336 | addr->sllc_mac); |
Eric Dumazet | 941666c | 2010-12-05 01:23:53 +0000 | [diff] [blame] | 337 | if (llc->dev) |
| 338 | dev_hold(llc->dev); |
| 339 | rcu_read_unlock(); |
Jochen Friedrich | cf309e3 | 2005-09-22 04:44:55 -0300 | [diff] [blame] | 340 | if (!llc->dev) |
| 341 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (!addr->sllc_sap) { |
| 343 | rc = -EUSERS; |
| 344 | addr->sllc_sap = llc_ui_autoport(); |
| 345 | if (!addr->sllc_sap) |
| 346 | goto out; |
| 347 | } |
| 348 | sap = llc_sap_find(addr->sllc_sap); |
| 349 | if (!sap) { |
| 350 | sap = llc_sap_open(addr->sllc_sap, NULL); |
| 351 | rc = -EBUSY; /* some other network layer is using the sap */ |
| 352 | if (!sap) |
| 353 | goto out; |
| 354 | } else { |
| 355 | struct llc_addr laddr, daddr; |
| 356 | struct sock *ask; |
| 357 | |
| 358 | memset(&laddr, 0, sizeof(laddr)); |
| 359 | memset(&daddr, 0, sizeof(daddr)); |
| 360 | /* |
Michael Opdenacker | 59c5159 | 2007-05-09 08:57:56 +0200 | [diff] [blame] | 361 | * FIXME: check if the address is multicast, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | * only SOCK_DGRAM can do this. |
| 363 | */ |
| 364 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); |
| 365 | laddr.lsap = addr->sllc_sap; |
| 366 | rc = -EADDRINUSE; /* mac + sap clash. */ |
| 367 | ask = llc_lookup_established(sap, &daddr, &laddr); |
| 368 | if (ask) { |
| 369 | sock_put(ask); |
Arnaldo Carvalho de Melo | 6e2144b | 2005-09-22 04:43:05 -0300 | [diff] [blame] | 370 | goto out_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | } |
| 373 | llc->laddr.lsap = addr->sllc_sap; |
| 374 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); |
| 375 | memcpy(&llc->addr, addr, sizeof(llc->addr)); |
| 376 | /* assign new connection to its SAP */ |
| 377 | llc_sap_add_socket(sap, sk); |
| 378 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 379 | rc = 0; |
Arnaldo Carvalho de Melo | 6e2144b | 2005-09-22 04:43:05 -0300 | [diff] [blame] | 380 | out_put: |
| 381 | llc_sap_put(sap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | out: |
| 383 | return rc; |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * llc_ui_shutdown - shutdown a connect llc2 socket. |
| 388 | * @sock: Socket to shutdown. |
| 389 | * @how: What part of the socket to shutdown. |
| 390 | * |
| 391 | * Shutdown a connected llc2 socket. Currently this function only supports |
| 392 | * shutting down both sends and receives (2), we could probably make this |
| 393 | * function such that a user can shutdown only half the connection but not |
| 394 | * right now. |
| 395 | * Returns: 0 upon success, negative otherwise. |
| 396 | */ |
| 397 | static int llc_ui_shutdown(struct socket *sock, int how) |
| 398 | { |
| 399 | struct sock *sk = sock->sk; |
| 400 | int rc = -ENOTCONN; |
| 401 | |
| 402 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 403 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | goto out; |
| 405 | rc = -EINVAL; |
| 406 | if (how != 2) |
| 407 | goto out; |
| 408 | rc = llc_send_disc(sk); |
| 409 | if (!rc) |
| 410 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); |
| 411 | /* Wake up anyone sleeping in poll */ |
| 412 | sk->sk_state_change(sk); |
| 413 | out: |
| 414 | release_sock(sk); |
| 415 | return rc; |
| 416 | } |
| 417 | |
| 418 | /** |
| 419 | * llc_ui_connect - Connect to a remote llc2 mac + sap. |
| 420 | * @sock: Socket which will be connected to the remote destination. |
| 421 | * @uaddr: Remote and possibly the local address of the new connection. |
| 422 | * @addrlen: Size of uaddr structure. |
| 423 | * @flags: Operational flags specified by the user. |
| 424 | * |
| 425 | * Connect to a remote llc2 mac + sap. The caller must specify the |
| 426 | * destination mac and address to connect to. If the user hasn't previously |
| 427 | * called bind(2) with a smac the address of the first interface of the |
| 428 | * specified arp type will be used. |
| 429 | * This function will autobind if user did not previously call bind. |
| 430 | * Returns: 0 upon success, negative otherwise. |
| 431 | */ |
| 432 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, |
| 433 | int addrlen, int flags) |
| 434 | { |
| 435 | struct sock *sk = sock->sk; |
| 436 | struct llc_sock *llc = llc_sk(sk); |
| 437 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | int rc = -EINVAL; |
| 439 | |
| 440 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 441 | if (unlikely(addrlen != sizeof(*addr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | goto out; |
| 443 | rc = -EAFNOSUPPORT; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 444 | if (unlikely(addr->sllc_family != AF_LLC)) |
| 445 | goto out; |
| 446 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
| 447 | goto out; |
| 448 | rc = -EALREADY; |
| 449 | if (unlikely(sock->state == SS_CONNECTING)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | goto out; |
| 451 | /* bind connection to sap if user hasn't done it. */ |
| 452 | if (sock_flag(sk, SOCK_ZAPPED)) { |
| 453 | /* bind to sap with null dev, exclusive */ |
| 454 | rc = llc_ui_autobind(sock, addr); |
| 455 | if (rc) |
| 456 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
Jochen Friedrich | 5564af2 | 2005-09-22 04:46:44 -0300 | [diff] [blame] | 458 | llc->daddr.lsap = addr->sllc_sap; |
| 459 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | sock->state = SS_CONNECTING; |
| 461 | sk->sk_state = TCP_SYN_SENT; |
| 462 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 463 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | addr->sllc_mac, addr->sllc_sap); |
| 465 | if (rc) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 466 | dprintk("%s: llc_ui_send_conn failed :-(\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | sock->state = SS_UNCONNECTED; |
| 468 | sk->sk_state = TCP_CLOSE; |
| 469 | goto out; |
| 470 | } |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 471 | |
| 472 | if (sk->sk_state == TCP_SYN_SENT) { |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 473 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 474 | |
| 475 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) |
| 476 | goto out; |
| 477 | |
| 478 | rc = sock_intr_errno(timeo); |
| 479 | if (signal_pending(current)) |
| 480 | goto out; |
| 481 | } |
| 482 | |
| 483 | if (sk->sk_state == TCP_CLOSE) |
| 484 | goto sock_error; |
| 485 | |
| 486 | sock->state = SS_CONNECTED; |
| 487 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | out: |
| 489 | release_sock(sk); |
| 490 | return rc; |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 491 | sock_error: |
| 492 | rc = sock_error(sk) ? : -ECONNABORTED; |
| 493 | sock->state = SS_UNCONNECTED; |
| 494 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | /** |
| 498 | * llc_ui_listen - allow a normal socket to accept incoming connections |
| 499 | * @sock: Socket to allow incoming connections on. |
| 500 | * @backlog: Number of connections to queue. |
| 501 | * |
| 502 | * Allow a normal socket to accept incoming connections. |
| 503 | * Returns 0 upon success, negative otherwise. |
| 504 | */ |
| 505 | static int llc_ui_listen(struct socket *sock, int backlog) |
| 506 | { |
| 507 | struct sock *sk = sock->sk; |
| 508 | int rc = -EINVAL; |
| 509 | |
| 510 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 511 | if (unlikely(sock->state != SS_UNCONNECTED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | goto out; |
| 513 | rc = -EOPNOTSUPP; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 514 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | goto out; |
| 516 | rc = -EAGAIN; |
| 517 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 518 | goto out; |
| 519 | rc = 0; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 520 | if (!(unsigned int)backlog) /* BSDism */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | backlog = 1; |
| 522 | sk->sk_max_ack_backlog = backlog; |
| 523 | if (sk->sk_state != TCP_LISTEN) { |
| 524 | sk->sk_ack_backlog = 0; |
| 525 | sk->sk_state = TCP_LISTEN; |
| 526 | } |
| 527 | sk->sk_socket->flags |= __SO_ACCEPTCON; |
| 528 | out: |
| 529 | release_sock(sk); |
| 530 | return rc; |
| 531 | } |
| 532 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 533 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | { |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 535 | DEFINE_WAIT(wait); |
| 536 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 538 | while (1) { |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 539 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 540 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) |
| 541 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | rc = -ERESTARTSYS; |
| 543 | if (signal_pending(current)) |
| 544 | break; |
| 545 | rc = -EAGAIN; |
| 546 | if (!timeout) |
| 547 | break; |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 548 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 550 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return rc; |
| 552 | } |
| 553 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 554 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | { |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 556 | DEFINE_WAIT(wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 558 | while (1) { |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 559 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 560 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) |
| 561 | break; |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 562 | if (signal_pending(current) || !timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 565 | finish_wait(sk_sleep(sk), &wait); |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 566 | return timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | } |
| 568 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 569 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | { |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 571 | DEFINE_WAIT(wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | struct llc_sock *llc = llc_sk(sk); |
| 573 | int rc; |
| 574 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 575 | while (1) { |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 576 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | rc = 0; |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 578 | if (sk_wait_event(sk, &timeout, |
| 579 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 580 | (!llc_data_accept_state(llc->state) && |
Jochen Friedrich | 451677c | 2005-11-14 21:57:46 -0800 | [diff] [blame] | 581 | !llc->remote_busy_flag && |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 582 | !llc->p_flag))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | break; |
| 584 | rc = -ERESTARTSYS; |
| 585 | if (signal_pending(current)) |
| 586 | break; |
| 587 | rc = -EAGAIN; |
| 588 | if (!timeout) |
| 589 | break; |
| 590 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 591 | finish_wait(sk_sleep(sk), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | return rc; |
| 593 | } |
| 594 | |
Arnaldo Carvalho de Melo | 2928c19 | 2005-09-22 05:14:33 -0300 | [diff] [blame] | 595 | static int llc_wait_data(struct sock *sk, long timeo) |
Arnaldo Carvalho de Melo | afdbe35 | 2005-09-22 04:37:07 -0300 | [diff] [blame] | 596 | { |
| 597 | int rc; |
| 598 | |
| 599 | while (1) { |
| 600 | /* |
| 601 | * POSIX 1003.1g mandates this order. |
| 602 | */ |
Benjamin LaHaise | c1cbe4b | 2005-12-13 23:22:19 -0800 | [diff] [blame] | 603 | rc = sock_error(sk); |
| 604 | if (rc) |
Arnaldo Carvalho de Melo | afdbe35 | 2005-09-22 04:37:07 -0300 | [diff] [blame] | 605 | break; |
Arnaldo Carvalho de Melo | afdbe35 | 2005-09-22 04:37:07 -0300 | [diff] [blame] | 606 | rc = 0; |
| 607 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 608 | break; |
| 609 | rc = -EAGAIN; |
| 610 | if (!timeo) |
| 611 | break; |
| 612 | rc = sock_intr_errno(timeo); |
| 613 | if (signal_pending(current)) |
| 614 | break; |
| 615 | rc = 0; |
| 616 | if (sk_wait_data(sk, &timeo)) |
| 617 | break; |
| 618 | } |
| 619 | return rc; |
| 620 | } |
| 621 | |
Octavian Purdila | e5cd6fe | 2009-12-26 11:51:00 +0000 | [diff] [blame] | 622 | static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb) |
| 623 | { |
| 624 | struct llc_sock *llc = llc_sk(skb->sk); |
| 625 | |
| 626 | if (llc->cmsg_flags & LLC_CMSG_PKTINFO) { |
| 627 | struct llc_pktinfo info; |
| 628 | |
| 629 | info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex; |
| 630 | llc_pdu_decode_dsap(skb, &info.lpi_sap); |
| 631 | llc_pdu_decode_da(skb, info.lpi_mac); |
| 632 | put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info); |
| 633 | } |
| 634 | } |
| 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | /** |
| 637 | * llc_ui_accept - accept a new incoming connection. |
| 638 | * @sock: Socket which connections arrive on. |
| 639 | * @newsock: Socket to move incoming connection to. |
| 640 | * @flags: User specified operational flags. |
| 641 | * |
| 642 | * Accept a new incoming connection. |
| 643 | * Returns 0 upon success, negative otherwise. |
| 644 | */ |
| 645 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) |
| 646 | { |
| 647 | struct sock *sk = sock->sk, *newsk; |
| 648 | struct llc_sock *llc, *newllc; |
| 649 | struct sk_buff *skb; |
| 650 | int rc = -EOPNOTSUPP; |
| 651 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 652 | dprintk("%s: accepting on %02X\n", __func__, |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 653 | llc_sk(sk)->laddr.lsap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 655 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | goto out; |
| 657 | rc = -EINVAL; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 658 | if (unlikely(sock->state != SS_UNCONNECTED || |
| 659 | sk->sk_state != TCP_LISTEN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | goto out; |
| 661 | /* wait for a connection to arrive. */ |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 662 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
Arnaldo Carvalho de Melo | afdbe35 | 2005-09-22 04:37:07 -0300 | [diff] [blame] | 663 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 664 | if (rc) |
| 665 | goto out; |
| 666 | } |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 667 | dprintk("%s: got a new connection on %02X\n", __func__, |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 668 | llc_sk(sk)->laddr.lsap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | skb = skb_dequeue(&sk->sk_receive_queue); |
| 670 | rc = -EINVAL; |
| 671 | if (!skb->sk) |
| 672 | goto frees; |
| 673 | rc = 0; |
| 674 | newsk = skb->sk; |
| 675 | /* attach connection to a new socket. */ |
| 676 | llc_ui_sk_init(newsock, newsk); |
| 677 | sock_reset_flag(newsk, SOCK_ZAPPED); |
| 678 | newsk->sk_state = TCP_ESTABLISHED; |
| 679 | newsock->state = SS_CONNECTED; |
| 680 | llc = llc_sk(sk); |
| 681 | newllc = llc_sk(newsk); |
| 682 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); |
| 683 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); |
| 684 | |
| 685 | /* put original socket back into a clean listen state. */ |
| 686 | sk->sk_state = TCP_LISTEN; |
| 687 | sk->sk_ack_backlog--; |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 688 | dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
| 690 | frees: |
| 691 | kfree_skb(skb); |
| 692 | out: |
| 693 | release_sock(sk); |
| 694 | return rc; |
| 695 | } |
| 696 | |
| 697 | /** |
| 698 | * llc_ui_recvmsg - copy received data to the socket user. |
| 699 | * @sock: Socket to copy data from. |
| 700 | * @msg: Various user space related information. |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 701 | * @len: Size of user buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | * @flags: User specified flags. |
| 703 | * |
| 704 | * Copy received data to the socket user. |
| 705 | * Returns non-negative upon success, negative otherwise. |
| 706 | */ |
| 707 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 708 | struct msghdr *msg, size_t len, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 710 | DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name); |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 711 | const int nonblock = flags & MSG_DONTWAIT; |
| 712 | struct sk_buff *skb = NULL; |
| 713 | struct sock *sk = sock->sk; |
| 714 | struct llc_sock *llc = llc_sk(sk); |
Radu Iliescu | 56ac11c | 2012-01-19 03:57:57 +0000 | [diff] [blame] | 715 | unsigned long cpu_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | size_t copied = 0; |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 717 | u32 peek_seq = 0; |
Daniel Borkmann | 4d231b7 | 2013-12-30 23:40:50 +0100 | [diff] [blame] | 718 | u32 *seq, skb_len; |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 719 | unsigned long used; |
| 720 | int target; /* Read at least this many bytes */ |
| 721 | long timeo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 724 | copied = -ENOTCONN; |
Stephen Hemminger | 29efcd2 | 2006-05-25 15:08:59 -0700 | [diff] [blame] | 725 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | goto out; |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 727 | |
| 728 | timeo = sock_rcvtimeo(sk, nonblock); |
| 729 | |
| 730 | seq = &llc->copied_seq; |
| 731 | if (flags & MSG_PEEK) { |
| 732 | peek_seq = llc->copied_seq; |
| 733 | seq = &peek_seq; |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 734 | } |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 735 | |
| 736 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
| 737 | copied = 0; |
| 738 | |
| 739 | do { |
| 740 | u32 offset; |
| 741 | |
| 742 | /* |
| 743 | * We need to check signals first, to get correct SIGURG |
| 744 | * handling. FIXME: Need to check this doesn't impact 1003.1g |
| 745 | * and move it down to the bottom of the loop |
| 746 | */ |
| 747 | if (signal_pending(current)) { |
| 748 | if (copied) |
| 749 | break; |
| 750 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; |
| 751 | break; |
| 752 | } |
| 753 | |
| 754 | /* Next get a buffer. */ |
| 755 | |
| 756 | skb = skb_peek(&sk->sk_receive_queue); |
| 757 | if (skb) { |
| 758 | offset = *seq; |
| 759 | goto found_ok_skb; |
| 760 | } |
| 761 | /* Well, if we have backlog, try to process it now yet. */ |
| 762 | |
| 763 | if (copied >= target && !sk->sk_backlog.tail) |
| 764 | break; |
| 765 | |
| 766 | if (copied) { |
| 767 | if (sk->sk_err || |
| 768 | sk->sk_state == TCP_CLOSE || |
| 769 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 770 | !timeo || |
| 771 | (flags & MSG_PEEK)) |
| 772 | break; |
| 773 | } else { |
| 774 | if (sock_flag(sk, SOCK_DONE)) |
| 775 | break; |
| 776 | |
| 777 | if (sk->sk_err) { |
| 778 | copied = sock_error(sk); |
| 779 | break; |
| 780 | } |
| 781 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 782 | break; |
| 783 | |
Stephen Hemminger | 29efcd2 | 2006-05-25 15:08:59 -0700 | [diff] [blame] | 784 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 785 | if (!sock_flag(sk, SOCK_DONE)) { |
| 786 | /* |
| 787 | * This occurs when user tries to read |
| 788 | * from never connected socket. |
| 789 | */ |
| 790 | copied = -ENOTCONN; |
| 791 | break; |
| 792 | } |
| 793 | break; |
| 794 | } |
| 795 | if (!timeo) { |
| 796 | copied = -EAGAIN; |
| 797 | break; |
| 798 | } |
| 799 | } |
| 800 | |
| 801 | if (copied >= target) { /* Do not sleep, just process backlog. */ |
| 802 | release_sock(sk); |
| 803 | lock_sock(sk); |
| 804 | } else |
| 805 | sk_wait_data(sk, &timeo); |
| 806 | |
| 807 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 808 | net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n", |
| 809 | current->comm, |
| 810 | task_pid_nr(current)); |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 811 | peek_seq = llc->copied_seq; |
| 812 | } |
| 813 | continue; |
| 814 | found_ok_skb: |
Daniel Borkmann | 4d231b7 | 2013-12-30 23:40:50 +0100 | [diff] [blame] | 815 | skb_len = skb->len; |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 816 | /* Ok so how much can we use? */ |
| 817 | used = skb->len - offset; |
| 818 | if (len < used) |
| 819 | used = len; |
| 820 | |
| 821 | if (!(flags & MSG_TRUNC)) { |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 822 | int rc = skb_copy_datagram_msg(skb, offset, msg, used); |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 823 | if (rc) { |
| 824 | /* Exception. Bailout! */ |
| 825 | if (!copied) |
| 826 | copied = -EFAULT; |
| 827 | break; |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | *seq += used; |
| 832 | copied += used; |
| 833 | len -= used; |
| 834 | |
Alex Juncu | 9cef310 | 2011-12-15 23:01:25 +0000 | [diff] [blame] | 835 | /* For non stream protcols we get one packet per recvmsg call */ |
| 836 | if (sk->sk_type != SOCK_STREAM) |
| 837 | goto copy_uaddr; |
| 838 | |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 839 | if (!(flags & MSG_PEEK)) { |
Radu Iliescu | 56ac11c | 2012-01-19 03:57:57 +0000 | [diff] [blame] | 840 | spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 841 | sk_eat_skb(sk, skb); |
Radu Iliescu | 56ac11c | 2012-01-19 03:57:57 +0000 | [diff] [blame] | 842 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 843 | *seq = 0; |
| 844 | } |
Stephen Hemminger | 30a584d | 2006-08-03 16:38:49 -0700 | [diff] [blame] | 845 | |
Stephen Hemminger | 30a584d | 2006-08-03 16:38:49 -0700 | [diff] [blame] | 846 | /* Partial read */ |
Daniel Borkmann | 4d231b7 | 2013-12-30 23:40:50 +0100 | [diff] [blame] | 847 | if (used + offset < skb_len) |
Stephen Hemminger | 30a584d | 2006-08-03 16:38:49 -0700 | [diff] [blame] | 848 | continue; |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 849 | } while (len > 0); |
| 850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | out: |
| 852 | release_sock(sk); |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 853 | return copied; |
| 854 | copy_uaddr: |
| 855 | if (uaddr != NULL && skb != NULL) { |
| 856 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); |
| 857 | msg->msg_namelen = sizeof(*uaddr); |
| 858 | } |
Octavian Purdila | e5cd6fe | 2009-12-26 11:51:00 +0000 | [diff] [blame] | 859 | if (llc_sk(sk)->cmsg_flags) |
| 860 | llc_cmsg_rcv(msg, skb); |
Alex Juncu | 9cef310 | 2011-12-15 23:01:25 +0000 | [diff] [blame] | 861 | |
| 862 | if (!(flags & MSG_PEEK)) { |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 863 | spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
| 864 | sk_eat_skb(sk, skb); |
| 865 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
| 866 | *seq = 0; |
Alex Juncu | 9cef310 | 2011-12-15 23:01:25 +0000 | [diff] [blame] | 867 | } |
| 868 | |
Arnaldo Carvalho de Melo | 8420e1b | 2005-09-22 08:29:08 -0300 | [diff] [blame] | 869 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
| 871 | |
| 872 | /** |
| 873 | * llc_ui_sendmsg - Transmit data provided by the socket user. |
| 874 | * @sock: Socket to transmit data from. |
| 875 | * @msg: Various user related information. |
| 876 | * @len: Length of data to transmit. |
| 877 | * |
| 878 | * Transmit data provided by the socket user. |
| 879 | * Returns non-negative upon success, negative otherwise. |
| 880 | */ |
| 881 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 882 | struct msghdr *msg, size_t len) |
| 883 | { |
| 884 | struct sock *sk = sock->sk; |
| 885 | struct llc_sock *llc = llc_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 886 | DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | int flags = msg->msg_flags; |
| 888 | int noblock = flags & MSG_DONTWAIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | struct sk_buff *skb; |
| 890 | size_t size = 0; |
| 891 | int rc = -EINVAL, copied = 0, hdrlen; |
| 892 | |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 893 | dprintk("%s: sending from %02X to %02X\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | llc->laddr.lsap, llc->daddr.lsap); |
| 895 | lock_sock(sk); |
| 896 | if (addr) { |
| 897 | if (msg->msg_namelen < sizeof(*addr)) |
| 898 | goto release; |
| 899 | } else { |
| 900 | if (llc_ui_addr_null(&llc->addr)) |
| 901 | goto release; |
| 902 | addr = &llc->addr; |
| 903 | } |
| 904 | /* must bind connection to sap if user hasn't done it. */ |
| 905 | if (sock_flag(sk, SOCK_ZAPPED)) { |
| 906 | /* bind to sap with null dev, exclusive. */ |
| 907 | rc = llc_ui_autobind(sock, addr); |
| 908 | if (rc) |
| 909 | goto release; |
| 910 | } |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 911 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | size = hdrlen + len; |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 913 | if (size > llc->dev->mtu) |
| 914 | size = llc->dev->mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | copied = size - hdrlen; |
| 916 | release_sock(sk); |
| 917 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
| 918 | lock_sock(sk); |
| 919 | if (!skb) |
| 920 | goto release; |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 921 | skb->dev = llc->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 923 | skb_reserve(skb, hdrlen); |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 924 | rc = memcpy_from_msg(skb_put(skb, copied), msg, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | if (rc) |
| 926 | goto out; |
| 927 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { |
| 928 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, |
| 929 | addr->sllc_sap); |
| 930 | goto out; |
| 931 | } |
| 932 | if (addr->sllc_test) { |
| 933 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, |
| 934 | addr->sllc_sap); |
| 935 | goto out; |
| 936 | } |
| 937 | if (addr->sllc_xid) { |
| 938 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, |
| 939 | addr->sllc_sap); |
| 940 | goto out; |
| 941 | } |
| 942 | rc = -ENOPROTOOPT; |
| 943 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) |
| 944 | goto out; |
| 945 | rc = llc_ui_send_data(sk, skb, noblock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | out: |
Arnaldo Carvalho de Melo | 249ff1c | 2005-09-22 04:32:10 -0300 | [diff] [blame] | 947 | if (rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | kfree_skb(skb); |
| 949 | release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 951 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
Arnaldo Carvalho de Melo | 249ff1c | 2005-09-22 04:32:10 -0300 | [diff] [blame] | 952 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | release_sock(sk); |
| 954 | return rc ? : copied; |
| 955 | } |
| 956 | |
| 957 | /** |
| 958 | * llc_ui_getname - return the address info of a socket |
| 959 | * @sock: Socket to get address of. |
| 960 | * @uaddr: Address structure to return information. |
| 961 | * @uaddrlen: Length of address structure. |
| 962 | * @peer: Does user want local or remote address information. |
| 963 | * |
| 964 | * Return the address information of a socket. |
| 965 | */ |
| 966 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, |
| 967 | int *uaddrlen, int peer) |
| 968 | { |
| 969 | struct sockaddr_llc sllc; |
| 970 | struct sock *sk = sock->sk; |
| 971 | struct llc_sock *llc = llc_sk(sk); |
Mathias Krause | 3592aae | 2012-08-15 11:31:53 +0000 | [diff] [blame] | 972 | int rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
Jiri Slaby | 28e9fc5 | 2009-08-23 22:55:51 -0700 | [diff] [blame] | 974 | memset(&sllc, 0, sizeof(sllc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | lock_sock(sk); |
| 976 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 977 | goto out; |
| 978 | *uaddrlen = sizeof(sllc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | if (peer) { |
| 980 | rc = -ENOTCONN; |
| 981 | if (sk->sk_state != TCP_ESTABLISHED) |
| 982 | goto out; |
| 983 | if(llc->dev) |
| 984 | sllc.sllc_arphrd = llc->dev->type; |
| 985 | sllc.sllc_sap = llc->daddr.lsap; |
| 986 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); |
| 987 | } else { |
| 988 | rc = -EINVAL; |
| 989 | if (!llc->sap) |
| 990 | goto out; |
| 991 | sllc.sllc_sap = llc->sap->laddr.lsap; |
| 992 | |
| 993 | if (llc->dev) { |
| 994 | sllc.sllc_arphrd = llc->dev->type; |
Jiri Pirko | a186d2a | 2009-05-12 22:40:12 +0000 | [diff] [blame] | 995 | memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | IFHWADDRLEN); |
| 997 | } |
| 998 | } |
| 999 | rc = 0; |
| 1000 | sllc.sllc_family = AF_LLC; |
| 1001 | memcpy(uaddr, &sllc, sizeof(sllc)); |
| 1002 | out: |
| 1003 | release_sock(sk); |
| 1004 | return rc; |
| 1005 | } |
| 1006 | |
| 1007 | /** |
| 1008 | * llc_ui_ioctl - io controls for PF_LLC |
| 1009 | * @sock: Socket to get/set info |
| 1010 | * @cmd: command |
| 1011 | * @arg: optional argument for cmd |
| 1012 | * |
| 1013 | * get/set info on llc sockets |
| 1014 | */ |
| 1015 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, |
| 1016 | unsigned long arg) |
| 1017 | { |
Christoph Hellwig | b5e5fa5 | 2006-01-03 14:18:33 -0800 | [diff] [blame] | 1018 | return -ENOIOCTLCMD; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | } |
| 1020 | |
| 1021 | /** |
| 1022 | * llc_ui_setsockopt - set various connection specific parameters. |
| 1023 | * @sock: Socket to set options on. |
| 1024 | * @level: Socket level user is requesting operations on. |
| 1025 | * @optname: Operation name. |
Ben Hutchings | 2c53040 | 2012-07-10 10:55:09 +0000 | [diff] [blame] | 1026 | * @optval: User provided operation data. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | * @optlen: Length of optval. |
| 1028 | * |
| 1029 | * Set various connection specific parameters. |
| 1030 | */ |
| 1031 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1032 | char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | { |
| 1034 | struct sock *sk = sock->sk; |
| 1035 | struct llc_sock *llc = llc_sk(sk); |
Dan Carpenter | 339db11 | 2010-09-10 01:56:16 +0000 | [diff] [blame] | 1036 | unsigned int opt; |
| 1037 | int rc = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 1040 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | goto out; |
| 1042 | rc = get_user(opt, (int __user *)optval); |
| 1043 | if (rc) |
| 1044 | goto out; |
| 1045 | rc = -EINVAL; |
| 1046 | switch (optname) { |
| 1047 | case LLC_OPT_RETRY: |
| 1048 | if (opt > LLC_OPT_MAX_RETRY) |
| 1049 | goto out; |
| 1050 | llc->n2 = opt; |
| 1051 | break; |
| 1052 | case LLC_OPT_SIZE: |
| 1053 | if (opt > LLC_OPT_MAX_SIZE) |
| 1054 | goto out; |
| 1055 | llc->n1 = opt; |
| 1056 | break; |
| 1057 | case LLC_OPT_ACK_TMR_EXP: |
| 1058 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) |
| 1059 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1060 | llc->ack_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | break; |
| 1062 | case LLC_OPT_P_TMR_EXP: |
| 1063 | if (opt > LLC_OPT_MAX_P_TMR_EXP) |
| 1064 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1065 | llc->pf_cycle_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | break; |
| 1067 | case LLC_OPT_REJ_TMR_EXP: |
| 1068 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) |
| 1069 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1070 | llc->rej_sent_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | break; |
| 1072 | case LLC_OPT_BUSY_TMR_EXP: |
| 1073 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) |
| 1074 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1075 | llc->busy_state_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | break; |
| 1077 | case LLC_OPT_TX_WIN: |
| 1078 | if (opt > LLC_OPT_MAX_WIN) |
| 1079 | goto out; |
| 1080 | llc->k = opt; |
| 1081 | break; |
| 1082 | case LLC_OPT_RX_WIN: |
| 1083 | if (opt > LLC_OPT_MAX_WIN) |
| 1084 | goto out; |
| 1085 | llc->rw = opt; |
| 1086 | break; |
Octavian Purdila | e5cd6fe | 2009-12-26 11:51:00 +0000 | [diff] [blame] | 1087 | case LLC_OPT_PKTINFO: |
| 1088 | if (opt) |
| 1089 | llc->cmsg_flags |= LLC_CMSG_PKTINFO; |
| 1090 | else |
| 1091 | llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; |
| 1092 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | default: |
| 1094 | rc = -ENOPROTOOPT; |
| 1095 | goto out; |
| 1096 | } |
| 1097 | rc = 0; |
| 1098 | out: |
| 1099 | release_sock(sk); |
| 1100 | return rc; |
| 1101 | } |
| 1102 | |
| 1103 | /** |
| 1104 | * llc_ui_getsockopt - get connection specific socket info |
| 1105 | * @sock: Socket to get information from. |
| 1106 | * @level: Socket level user is requesting operations on. |
| 1107 | * @optname: Operation name. |
| 1108 | * @optval: Variable to return operation data in. |
| 1109 | * @optlen: Length of optval. |
| 1110 | * |
| 1111 | * Get connection specific socket information. |
| 1112 | */ |
| 1113 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, |
| 1114 | char __user *optval, int __user *optlen) |
| 1115 | { |
| 1116 | struct sock *sk = sock->sk; |
| 1117 | struct llc_sock *llc = llc_sk(sk); |
| 1118 | int val = 0, len = 0, rc = -EINVAL; |
| 1119 | |
| 1120 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 1121 | if (unlikely(level != SOL_LLC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | goto out; |
| 1123 | rc = get_user(len, optlen); |
| 1124 | if (rc) |
| 1125 | goto out; |
| 1126 | rc = -EINVAL; |
| 1127 | if (len != sizeof(int)) |
| 1128 | goto out; |
| 1129 | switch (optname) { |
| 1130 | case LLC_OPT_RETRY: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1131 | val = llc->n2; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | case LLC_OPT_SIZE: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1133 | val = llc->n1; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | case LLC_OPT_ACK_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1135 | val = llc->ack_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | case LLC_OPT_P_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1137 | val = llc->pf_cycle_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | case LLC_OPT_REJ_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1139 | val = llc->rej_sent_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | case LLC_OPT_BUSY_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1141 | val = llc->busy_state_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | case LLC_OPT_TX_WIN: |
| 1143 | val = llc->k; break; |
| 1144 | case LLC_OPT_RX_WIN: |
| 1145 | val = llc->rw; break; |
Octavian Purdila | e5cd6fe | 2009-12-26 11:51:00 +0000 | [diff] [blame] | 1146 | case LLC_OPT_PKTINFO: |
| 1147 | val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; |
| 1148 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | default: |
| 1150 | rc = -ENOPROTOOPT; |
| 1151 | goto out; |
| 1152 | } |
| 1153 | rc = 0; |
| 1154 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
| 1155 | rc = -EFAULT; |
| 1156 | out: |
| 1157 | release_sock(sk); |
| 1158 | return rc; |
| 1159 | } |
| 1160 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 1161 | static const struct net_proto_family llc_ui_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | .family = PF_LLC, |
| 1163 | .create = llc_ui_create, |
| 1164 | .owner = THIS_MODULE, |
| 1165 | }; |
| 1166 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1167 | static const struct proto_ops llc_ui_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | .family = PF_LLC, |
| 1169 | .owner = THIS_MODULE, |
| 1170 | .release = llc_ui_release, |
| 1171 | .bind = llc_ui_bind, |
| 1172 | .connect = llc_ui_connect, |
| 1173 | .socketpair = sock_no_socketpair, |
| 1174 | .accept = llc_ui_accept, |
| 1175 | .getname = llc_ui_getname, |
| 1176 | .poll = datagram_poll, |
| 1177 | .ioctl = llc_ui_ioctl, |
| 1178 | .listen = llc_ui_listen, |
| 1179 | .shutdown = llc_ui_shutdown, |
| 1180 | .setsockopt = llc_ui_setsockopt, |
| 1181 | .getsockopt = llc_ui_getsockopt, |
| 1182 | .sendmsg = llc_ui_sendmsg, |
| 1183 | .recvmsg = llc_ui_recvmsg, |
| 1184 | .mmap = sock_no_mmap, |
| 1185 | .sendpage = sock_no_sendpage, |
| 1186 | }; |
| 1187 | |
Stephen Hemminger | 01af4a0 | 2009-02-22 00:02:44 -0800 | [diff] [blame] | 1188 | static const char llc_proc_err_msg[] __initconst = |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 1189 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
Stephen Hemminger | 01af4a0 | 2009-02-22 00:02:44 -0800 | [diff] [blame] | 1190 | static const char llc_sysctl_err_msg[] __initconst = |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 1191 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
Stephen Hemminger | 01af4a0 | 2009-02-22 00:02:44 -0800 | [diff] [blame] | 1192 | static const char llc_sock_err_msg[] __initconst = |
YOSHIFUJI Hideaki | d57b186 | 2007-02-09 23:25:01 +0900 | [diff] [blame] | 1193 | KERN_CRIT "LLC: Unable to register the network family\n"; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | static int __init llc2_init(void) |
| 1196 | { |
| 1197 | int rc = proto_register(&llc_proto, 0); |
| 1198 | |
| 1199 | if (rc != 0) |
| 1200 | goto out; |
| 1201 | |
| 1202 | llc_build_offset_table(); |
| 1203 | llc_station_init(); |
| 1204 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
| 1205 | rc = llc_proc_init(); |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1206 | if (rc != 0) { |
| 1207 | printk(llc_proc_err_msg); |
Ben Hutchings | f4f8720 | 2012-08-13 02:50:43 +0000 | [diff] [blame] | 1208 | goto out_station; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1209 | } |
| 1210 | rc = llc_sysctl_init(); |
| 1211 | if (rc) { |
| 1212 | printk(llc_sysctl_err_msg); |
| 1213 | goto out_proc; |
| 1214 | } |
| 1215 | rc = sock_register(&llc_ui_family_ops); |
| 1216 | if (rc) { |
| 1217 | printk(llc_sock_err_msg); |
| 1218 | goto out_sysctl; |
| 1219 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
| 1221 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); |
| 1222 | out: |
| 1223 | return rc; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1224 | out_sysctl: |
| 1225 | llc_sysctl_exit(); |
| 1226 | out_proc: |
| 1227 | llc_proc_exit(); |
Ben Hutchings | f4f8720 | 2012-08-13 02:50:43 +0000 | [diff] [blame] | 1228 | out_station: |
| 1229 | llc_station_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | proto_unregister(&llc_proto); |
| 1231 | goto out; |
| 1232 | } |
| 1233 | |
| 1234 | static void __exit llc2_exit(void) |
| 1235 | { |
| 1236 | llc_station_exit(); |
| 1237 | llc_remove_pack(LLC_DEST_SAP); |
| 1238 | llc_remove_pack(LLC_DEST_CONN); |
| 1239 | sock_unregister(PF_LLC); |
| 1240 | llc_proc_exit(); |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1241 | llc_sysctl_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | proto_unregister(&llc_proto); |
| 1243 | } |
| 1244 | |
| 1245 | module_init(llc2_init); |
| 1246 | module_exit(llc2_exit); |
| 1247 | |
| 1248 | MODULE_LICENSE("GPL"); |
| 1249 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); |
| 1250 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); |
| 1251 | MODULE_ALIAS_NETPROTO(PF_LLC); |