Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/proto.c |
| 3 | * |
| 4 | * An implementation of the DCCP protocol |
| 5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 12 | #include <linux/dccp.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/netdevice.h> |
| 19 | #include <linux/in.h> |
| 20 | #include <linux/if_arp.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/random.h> |
| 23 | #include <net/checksum.h> |
| 24 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 25 | #include <net/inet_sock.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 26 | #include <net/sock.h> |
| 27 | #include <net/xfrm.h> |
| 28 | |
Arnaldo Carvalho de Melo | 6273172 | 2007-10-23 20:23:30 -0700 | [diff] [blame] | 29 | #include <asm/ioctls.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 30 | #include <asm/semaphore.h> |
| 31 | #include <linux/spinlock.h> |
| 32 | #include <linux/timer.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/poll.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 35 | |
| 36 | #include "ccid.h" |
| 37 | #include "dccp.h" |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 38 | #include "feat.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 39 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 40 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 41 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 42 | EXPORT_SYMBOL_GPL(dccp_statistics); |
| 43 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 44 | atomic_t dccp_orphan_count = ATOMIC_INIT(0); |
| 45 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 46 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
| 47 | |
Arnaldo Carvalho de Melo | 075ae86 | 2006-03-20 21:24:19 -0800 | [diff] [blame] | 48 | struct inet_hashinfo __cacheline_aligned dccp_hashinfo = { |
| 49 | .lhash_lock = RW_LOCK_UNLOCKED, |
| 50 | .lhash_users = ATOMIC_INIT(0), |
| 51 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait), |
| 52 | }; |
| 53 | |
| 54 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
| 55 | |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 56 | /* the maximum queue length for tx in packets. 0 is no limit */ |
| 57 | int sysctl_dccp_tx_qlen __read_mostly = 5; |
| 58 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 59 | void dccp_set_state(struct sock *sk, const int state) |
| 60 | { |
| 61 | const int oldstate = sk->sk_state; |
| 62 | |
| 63 | dccp_pr_debug("%s(%p) %-10.10s -> %s\n", |
| 64 | dccp_role(sk), sk, |
| 65 | dccp_state_name(oldstate), dccp_state_name(state)); |
| 66 | WARN_ON(state == oldstate); |
| 67 | |
| 68 | switch (state) { |
| 69 | case DCCP_OPEN: |
| 70 | if (oldstate != DCCP_OPEN) |
| 71 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); |
| 72 | break; |
| 73 | |
| 74 | case DCCP_CLOSED: |
| 75 | if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN) |
| 76 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
| 77 | |
| 78 | sk->sk_prot->unhash(sk); |
| 79 | if (inet_csk(sk)->icsk_bind_hash != NULL && |
| 80 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) |
| 81 | inet_put_port(&dccp_hashinfo, sk); |
| 82 | /* fall through */ |
| 83 | default: |
| 84 | if (oldstate == DCCP_OPEN) |
| 85 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); |
| 86 | } |
| 87 | |
| 88 | /* Change state AFTER socket is unhashed to avoid closed |
| 89 | * socket sitting in hash tables. |
| 90 | */ |
| 91 | sk->sk_state = state; |
| 92 | } |
| 93 | |
| 94 | EXPORT_SYMBOL_GPL(dccp_set_state); |
| 95 | |
| 96 | void dccp_done(struct sock *sk) |
| 97 | { |
| 98 | dccp_set_state(sk, DCCP_CLOSED); |
| 99 | dccp_clear_xmit_timers(sk); |
| 100 | |
| 101 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 102 | |
| 103 | if (!sock_flag(sk, SOCK_DEAD)) |
| 104 | sk->sk_state_change(sk); |
| 105 | else |
| 106 | inet_csk_destroy_sock(sk); |
| 107 | } |
| 108 | |
| 109 | EXPORT_SYMBOL_GPL(dccp_done); |
| 110 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 111 | const char *dccp_packet_name(const int type) |
| 112 | { |
| 113 | static const char *dccp_packet_names[] = { |
| 114 | [DCCP_PKT_REQUEST] = "REQUEST", |
| 115 | [DCCP_PKT_RESPONSE] = "RESPONSE", |
| 116 | [DCCP_PKT_DATA] = "DATA", |
| 117 | [DCCP_PKT_ACK] = "ACK", |
| 118 | [DCCP_PKT_DATAACK] = "DATAACK", |
| 119 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", |
| 120 | [DCCP_PKT_CLOSE] = "CLOSE", |
| 121 | [DCCP_PKT_RESET] = "RESET", |
| 122 | [DCCP_PKT_SYNC] = "SYNC", |
| 123 | [DCCP_PKT_SYNCACK] = "SYNCACK", |
| 124 | }; |
| 125 | |
| 126 | if (type >= DCCP_NR_PKT_TYPES) |
| 127 | return "INVALID"; |
| 128 | else |
| 129 | return dccp_packet_names[type]; |
| 130 | } |
| 131 | |
| 132 | EXPORT_SYMBOL_GPL(dccp_packet_name); |
| 133 | |
| 134 | const char *dccp_state_name(const int state) |
| 135 | { |
| 136 | static char *dccp_state_names[] = { |
| 137 | [DCCP_OPEN] = "OPEN", |
| 138 | [DCCP_REQUESTING] = "REQUESTING", |
| 139 | [DCCP_PARTOPEN] = "PARTOPEN", |
| 140 | [DCCP_LISTEN] = "LISTEN", |
| 141 | [DCCP_RESPOND] = "RESPOND", |
| 142 | [DCCP_CLOSING] = "CLOSING", |
| 143 | [DCCP_TIME_WAIT] = "TIME_WAIT", |
| 144 | [DCCP_CLOSED] = "CLOSED", |
| 145 | }; |
| 146 | |
| 147 | if (state >= DCCP_MAX_STATES) |
| 148 | return "INVALID STATE!"; |
| 149 | else |
| 150 | return dccp_state_names[state]; |
| 151 | } |
| 152 | |
| 153 | EXPORT_SYMBOL_GPL(dccp_state_name); |
| 154 | |
Arnaldo Carvalho de Melo | c985ed7 | 2006-03-20 21:23:39 -0800 | [diff] [blame] | 155 | void dccp_hash(struct sock *sk) |
| 156 | { |
| 157 | inet_hash(&dccp_hashinfo, sk); |
| 158 | } |
| 159 | |
| 160 | EXPORT_SYMBOL_GPL(dccp_hash); |
| 161 | |
| 162 | void dccp_unhash(struct sock *sk) |
| 163 | { |
| 164 | inet_unhash(&dccp_hashinfo, sk); |
| 165 | } |
| 166 | |
| 167 | EXPORT_SYMBOL_GPL(dccp_unhash); |
| 168 | |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 169 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized) |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 170 | { |
| 171 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 172 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 173 | struct inet_connection_sock *icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 174 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 175 | dccp_minisock_init(&dp->dccps_minisock); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 176 | |
Arnaldo Carvalho de Melo | e18d7a9 | 2007-11-24 21:42:53 -0200 | [diff] [blame] | 177 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
| 178 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; |
| 179 | sk->sk_state = DCCP_CLOSED; |
| 180 | sk->sk_write_space = dccp_write_space; |
| 181 | icsk->icsk_sync_mss = dccp_sync_mss; |
| 182 | dp->dccps_mss_cache = 536; |
| 183 | dp->dccps_rate_last = jiffies; |
| 184 | dp->dccps_role = DCCP_ROLE_UNDEFINED; |
| 185 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; |
| 186 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
| 187 | |
| 188 | dccp_init_xmit_timers(sk); |
| 189 | |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 190 | /* |
| 191 | * FIXME: We're hardcoding the CCID, and doing this at this point makes |
| 192 | * the listening (master) sock get CCID control blocks, which is not |
| 193 | * necessary, but for now, to not mess with the test userspace apps, |
| 194 | * lets leave it here, later the real solution is to do this in a |
| 195 | * setsockopt(CCIDs-I-want/accept). -acme |
| 196 | */ |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 197 | if (likely(ctl_sock_initialized)) { |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 198 | int rc = dccp_feat_init(dmsk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 199 | |
| 200 | if (rc) |
| 201 | return rc; |
| 202 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 203 | if (dmsk->dccpms_send_ack_vector) { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 204 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
| 205 | if (dp->dccps_hc_rx_ackvec == NULL) |
| 206 | return -ENOMEM; |
| 207 | } |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 208 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
| 209 | sk, GFP_KERNEL); |
| 210 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, |
| 211 | sk, GFP_KERNEL); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 212 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 213 | dp->dccps_hc_tx_ccid == NULL)) { |
| 214 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
| 215 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 216 | if (dmsk->dccpms_send_ack_vector) { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 217 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
| 218 | dp->dccps_hc_rx_ackvec = NULL; |
| 219 | } |
| 220 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; |
| 221 | return -ENOMEM; |
| 222 | } |
| 223 | } else { |
| 224 | /* control socket doesn't need feat nego */ |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 225 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
| 226 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 227 | } |
| 228 | |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | EXPORT_SYMBOL_GPL(dccp_init_sock); |
| 233 | |
| 234 | int dccp_destroy_sock(struct sock *sk) |
| 235 | { |
| 236 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 237 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 238 | |
| 239 | /* |
| 240 | * DCCP doesn't use sk_write_queue, just sk_send_head |
| 241 | * for retransmissions |
| 242 | */ |
| 243 | if (sk->sk_send_head != NULL) { |
| 244 | kfree_skb(sk->sk_send_head); |
| 245 | sk->sk_send_head = NULL; |
| 246 | } |
| 247 | |
| 248 | /* Clean up a referenced DCCP bind bucket. */ |
| 249 | if (inet_csk(sk)->icsk_bind_hash != NULL) |
| 250 | inet_put_port(&dccp_hashinfo, sk); |
| 251 | |
| 252 | kfree(dp->dccps_service_list); |
| 253 | dp->dccps_service_list = NULL; |
| 254 | |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 255 | if (dmsk->dccpms_send_ack_vector) { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 256 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
| 257 | dp->dccps_hc_rx_ackvec = NULL; |
| 258 | } |
| 259 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
| 260 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); |
| 261 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; |
| 262 | |
| 263 | /* clean up feature negotiation state */ |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 264 | dccp_feat_clean(dmsk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); |
| 270 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 271 | static inline int dccp_listen_start(struct sock *sk, int backlog) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 272 | { |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 273 | struct dccp_sock *dp = dccp_sk(sk); |
| 274 | |
| 275 | dp->dccps_role = DCCP_ROLE_LISTEN; |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 276 | return inet_csk_listen_start(sk, backlog); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame^] | 279 | static inline int dccp_need_reset(int state) |
| 280 | { |
| 281 | return state != DCCP_CLOSED && state != DCCP_LISTEN && |
| 282 | state != DCCP_REQUESTING; |
| 283 | } |
| 284 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 285 | int dccp_disconnect(struct sock *sk, int flags) |
| 286 | { |
| 287 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 288 | struct inet_sock *inet = inet_sk(sk); |
| 289 | int err = 0; |
| 290 | const int old_state = sk->sk_state; |
| 291 | |
| 292 | if (old_state != DCCP_CLOSED) |
| 293 | dccp_set_state(sk, DCCP_CLOSED); |
| 294 | |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame^] | 295 | /* |
| 296 | * This corresponds to the ABORT function of RFC793, sec. 3.8 |
| 297 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". |
| 298 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 299 | if (old_state == DCCP_LISTEN) { |
| 300 | inet_csk_listen_stop(sk); |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame^] | 301 | } else if (dccp_need_reset(old_state)) { |
| 302 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 303 | sk->sk_err = ECONNRESET; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 304 | } else if (old_state == DCCP_REQUESTING) |
| 305 | sk->sk_err = ECONNRESET; |
| 306 | |
| 307 | dccp_clear_xmit_timers(sk); |
| 308 | __skb_queue_purge(&sk->sk_receive_queue); |
| 309 | if (sk->sk_send_head != NULL) { |
| 310 | __kfree_skb(sk->sk_send_head); |
| 311 | sk->sk_send_head = NULL; |
| 312 | } |
| 313 | |
| 314 | inet->dport = 0; |
| 315 | |
| 316 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 317 | inet_reset_saddr(sk); |
| 318 | |
| 319 | sk->sk_shutdown = 0; |
| 320 | sock_reset_flag(sk, SOCK_DONE); |
| 321 | |
| 322 | icsk->icsk_backoff = 0; |
| 323 | inet_csk_delack_init(sk); |
| 324 | __sk_dst_reset(sk); |
| 325 | |
| 326 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); |
| 327 | |
| 328 | sk->sk_error_report(sk); |
| 329 | return err; |
| 330 | } |
| 331 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 332 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
| 333 | |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 334 | /* |
| 335 | * Wait for a DCCP event. |
| 336 | * |
| 337 | * Note that we don't need to lock the socket, as the upper poll layers |
| 338 | * take care of normal races (between the test and the event) and we don't |
| 339 | * go look at any of the socket buffers directly. |
| 340 | */ |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 341 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
| 342 | poll_table *wait) |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 343 | { |
| 344 | unsigned int mask; |
| 345 | struct sock *sk = sock->sk; |
| 346 | |
| 347 | poll_wait(file, sk->sk_sleep, wait); |
| 348 | if (sk->sk_state == DCCP_LISTEN) |
| 349 | return inet_csk_listen_poll(sk); |
| 350 | |
| 351 | /* Socket is not locked. We are protected from async events |
| 352 | by poll logic and correct handling of state changes |
| 353 | made by another threads is impossible in any case. |
| 354 | */ |
| 355 | |
| 356 | mask = 0; |
| 357 | if (sk->sk_err) |
| 358 | mask = POLLERR; |
| 359 | |
| 360 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) |
| 361 | mask |= POLLHUP; |
| 362 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 363 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 364 | |
| 365 | /* Connected? */ |
| 366 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { |
| 367 | if (atomic_read(&sk->sk_rmem_alloc) > 0) |
| 368 | mask |= POLLIN | POLLRDNORM; |
| 369 | |
| 370 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 371 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
| 372 | mask |= POLLOUT | POLLWRNORM; |
| 373 | } else { /* send SIGIO later */ |
| 374 | set_bit(SOCK_ASYNC_NOSPACE, |
| 375 | &sk->sk_socket->flags); |
| 376 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 377 | |
| 378 | /* Race breaker. If space is freed after |
| 379 | * wspace test but before the flags are set, |
| 380 | * IO signal will be lost. |
| 381 | */ |
| 382 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
| 383 | mask |= POLLOUT | POLLWRNORM; |
| 384 | } |
| 385 | } |
| 386 | } |
| 387 | return mask; |
| 388 | } |
| 389 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 390 | EXPORT_SYMBOL_GPL(dccp_poll); |
| 391 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 392 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 393 | { |
Arnaldo Carvalho de Melo | 6273172 | 2007-10-23 20:23:30 -0700 | [diff] [blame] | 394 | int rc = -ENOTCONN; |
| 395 | |
| 396 | lock_sock(sk); |
| 397 | |
| 398 | if (sk->sk_state == DCCP_LISTEN) |
| 399 | goto out; |
| 400 | |
| 401 | switch (cmd) { |
| 402 | case SIOCINQ: { |
| 403 | struct sk_buff *skb; |
| 404 | unsigned long amount = 0; |
| 405 | |
| 406 | skb = skb_peek(&sk->sk_receive_queue); |
| 407 | if (skb != NULL) { |
| 408 | /* |
| 409 | * We will only return the amount of this packet since |
| 410 | * that is all that will be read. |
| 411 | */ |
| 412 | amount = skb->len; |
| 413 | } |
| 414 | rc = put_user(amount, (int __user *)arg); |
| 415 | } |
| 416 | break; |
| 417 | default: |
| 418 | rc = -ENOIOCTLCMD; |
| 419 | break; |
| 420 | } |
| 421 | out: |
| 422 | release_sock(sk); |
| 423 | return rc; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 424 | } |
| 425 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 426 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
| 427 | |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 428 | static int dccp_setsockopt_service(struct sock *sk, const __be32 service, |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 429 | char __user *optval, int optlen) |
| 430 | { |
| 431 | struct dccp_sock *dp = dccp_sk(sk); |
| 432 | struct dccp_service_list *sl = NULL; |
| 433 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 434 | if (service == DCCP_SERVICE_INVALID_VALUE || |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 435 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
| 436 | return -EINVAL; |
| 437 | |
| 438 | if (optlen > sizeof(service)) { |
| 439 | sl = kmalloc(optlen, GFP_KERNEL); |
| 440 | if (sl == NULL) |
| 441 | return -ENOMEM; |
| 442 | |
| 443 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; |
| 444 | if (copy_from_user(sl->dccpsl_list, |
| 445 | optval + sizeof(service), |
| 446 | optlen - sizeof(service)) || |
| 447 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { |
| 448 | kfree(sl); |
| 449 | return -EFAULT; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | lock_sock(sk); |
| 454 | dp->dccps_service = service; |
| 455 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 456 | kfree(dp->dccps_service_list); |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 457 | |
| 458 | dp->dccps_service_list = sl; |
| 459 | release_sock(sk); |
| 460 | return 0; |
| 461 | } |
| 462 | |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 463 | /* byte 1 is feature. the rest is the preference list */ |
| 464 | static int dccp_setsockopt_change(struct sock *sk, int type, |
| 465 | struct dccp_so_feat __user *optval) |
| 466 | { |
| 467 | struct dccp_so_feat opt; |
| 468 | u8 *val; |
| 469 | int rc; |
| 470 | |
| 471 | if (copy_from_user(&opt, optval, sizeof(opt))) |
| 472 | return -EFAULT; |
| 473 | |
| 474 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); |
| 475 | if (!val) |
| 476 | return -ENOMEM; |
| 477 | |
| 478 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { |
| 479 | rc = -EFAULT; |
| 480 | goto out_free_val; |
| 481 | } |
| 482 | |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 483 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
| 484 | val, opt.dccpsf_len, GFP_KERNEL); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 485 | if (rc) |
| 486 | goto out_free_val; |
| 487 | |
| 488 | out: |
| 489 | return rc; |
| 490 | |
| 491 | out_free_val: |
| 492 | kfree(val); |
| 493 | goto out; |
| 494 | } |
| 495 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 496 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
| 497 | char __user *optval, int optlen) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 498 | { |
Gerrit Renker | 09dbc38 | 2006-11-14 12:57:34 -0200 | [diff] [blame] | 499 | struct dccp_sock *dp = dccp_sk(sk); |
| 500 | int val, err = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 501 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 502 | if (optlen < sizeof(int)) |
| 503 | return -EINVAL; |
| 504 | |
| 505 | if (get_user(val, (int __user *)optval)) |
| 506 | return -EFAULT; |
| 507 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 508 | if (optname == DCCP_SOCKOPT_SERVICE) |
| 509 | return dccp_setsockopt_service(sk, val, optval, optlen); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 510 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 511 | lock_sock(sk); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 512 | switch (optname) { |
| 513 | case DCCP_SOCKOPT_PACKET_SIZE: |
Gerrit Renker | 5aed324 | 2006-11-28 19:33:36 -0200 | [diff] [blame] | 514 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
Arnaldo Carvalho de Melo | 841bac1 | 2006-11-28 19:42:03 -0200 | [diff] [blame] | 515 | err = 0; |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 516 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 517 | case DCCP_SOCKOPT_CHANGE_L: |
| 518 | if (optlen != sizeof(struct dccp_so_feat)) |
| 519 | err = -EINVAL; |
| 520 | else |
| 521 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 522 | (struct dccp_so_feat __user *) |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 523 | optval); |
| 524 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 525 | case DCCP_SOCKOPT_CHANGE_R: |
| 526 | if (optlen != sizeof(struct dccp_so_feat)) |
| 527 | err = -EINVAL; |
| 528 | else |
| 529 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, |
Alan Cox | 9faefb6 | 2006-07-10 14:24:23 -0700 | [diff] [blame] | 530 | (struct dccp_so_feat __user *) |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 531 | optval); |
| 532 | break; |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 533 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
| 534 | if (val < 0 || val > 15) |
| 535 | err = -EINVAL; |
| 536 | else |
| 537 | dp->dccps_pcslen = val; |
| 538 | break; |
| 539 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ |
| 540 | if (val < 0 || val > 15) |
| 541 | err = -EINVAL; |
| 542 | else { |
| 543 | dp->dccps_pcrlen = val; |
| 544 | /* FIXME: add feature negotiation, |
| 545 | * ChangeL(MinimumChecksumCoverage, val) */ |
| 546 | } |
| 547 | break; |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 548 | default: |
| 549 | err = -ENOPROTOOPT; |
| 550 | break; |
| 551 | } |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 552 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 553 | release_sock(sk); |
| 554 | return err; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 555 | } |
| 556 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 557 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
| 558 | char __user *optval, int optlen) |
| 559 | { |
| 560 | if (level != SOL_DCCP) |
| 561 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, |
| 562 | optname, optval, |
| 563 | optlen); |
| 564 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 565 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 566 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 567 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
| 568 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 569 | #ifdef CONFIG_COMPAT |
| 570 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 571 | char __user *optval, int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 572 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 573 | if (level != SOL_DCCP) |
| 574 | return inet_csk_compat_setsockopt(sk, level, optname, |
| 575 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 576 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 577 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 578 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 579 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
| 580 | #endif |
| 581 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 582 | static int dccp_getsockopt_service(struct sock *sk, int len, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 583 | __be32 __user *optval, |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 584 | int __user *optlen) |
| 585 | { |
| 586 | const struct dccp_sock *dp = dccp_sk(sk); |
| 587 | const struct dccp_service_list *sl; |
| 588 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); |
| 589 | |
| 590 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 591 | if ((sl = dp->dccps_service_list) != NULL) { |
| 592 | slen = sl->dccpsl_nr * sizeof(u32); |
| 593 | total_len += slen; |
| 594 | } |
| 595 | |
| 596 | err = -EINVAL; |
| 597 | if (total_len > len) |
| 598 | goto out; |
| 599 | |
| 600 | err = 0; |
| 601 | if (put_user(total_len, optlen) || |
| 602 | put_user(dp->dccps_service, optval) || |
| 603 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) |
| 604 | err = -EFAULT; |
| 605 | out: |
| 606 | release_sock(sk); |
| 607 | return err; |
| 608 | } |
| 609 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 610 | static int do_dccp_getsockopt(struct sock *sk, int level, int optname, |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 611 | char __user *optval, int __user *optlen) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 612 | { |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 613 | struct dccp_sock *dp; |
| 614 | int val, len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 615 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 616 | if (get_user(len, optlen)) |
| 617 | return -EFAULT; |
| 618 | |
Arnaldo Carvalho de Melo | 39ebc02 | 2007-03-28 11:54:32 -0700 | [diff] [blame] | 619 | if (len < (int)sizeof(int)) |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 620 | return -EINVAL; |
| 621 | |
| 622 | dp = dccp_sk(sk); |
| 623 | |
| 624 | switch (optname) { |
| 625 | case DCCP_SOCKOPT_PACKET_SIZE: |
Gerrit Renker | 5aed324 | 2006-11-28 19:33:36 -0200 | [diff] [blame] | 626 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
Arnaldo Carvalho de Melo | 841bac1 | 2006-11-28 19:42:03 -0200 | [diff] [blame] | 627 | return 0; |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 628 | case DCCP_SOCKOPT_SERVICE: |
| 629 | return dccp_getsockopt_service(sk, len, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 630 | (__be32 __user *)optval, optlen); |
Gerrit Renker | 7c559a9 | 2007-10-04 14:39:22 -0700 | [diff] [blame] | 631 | case DCCP_SOCKOPT_GET_CUR_MPS: |
| 632 | val = dp->dccps_mss_cache; |
| 633 | len = sizeof(val); |
| 634 | break; |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 635 | case DCCP_SOCKOPT_SEND_CSCOV: |
| 636 | val = dp->dccps_pcslen; |
Arnaldo Carvalho de Melo | 39ebc02 | 2007-03-28 11:54:32 -0700 | [diff] [blame] | 637 | len = sizeof(val); |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 638 | break; |
| 639 | case DCCP_SOCKOPT_RECV_CSCOV: |
| 640 | val = dp->dccps_pcrlen; |
Arnaldo Carvalho de Melo | 39ebc02 | 2007-03-28 11:54:32 -0700 | [diff] [blame] | 641 | len = sizeof(val); |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 642 | break; |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 643 | case 128 ... 191: |
| 644 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, |
| 645 | len, (u32 __user *)optval, optlen); |
| 646 | case 192 ... 255: |
| 647 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, |
| 648 | len, (u32 __user *)optval, optlen); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 649 | default: |
| 650 | return -ENOPROTOOPT; |
| 651 | } |
| 652 | |
| 653 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
| 654 | return -EFAULT; |
| 655 | |
| 656 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 657 | } |
| 658 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 659 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
| 660 | char __user *optval, int __user *optlen) |
| 661 | { |
| 662 | if (level != SOL_DCCP) |
| 663 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, |
| 664 | optname, optval, |
| 665 | optlen); |
| 666 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 667 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 668 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 669 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
| 670 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 671 | #ifdef CONFIG_COMPAT |
| 672 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 673 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 674 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 675 | if (level != SOL_DCCP) |
| 676 | return inet_csk_compat_getsockopt(sk, level, optname, |
| 677 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 678 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 679 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 680 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 681 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
| 682 | #endif |
| 683 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 684 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 685 | size_t len) |
| 686 | { |
| 687 | const struct dccp_sock *dp = dccp_sk(sk); |
| 688 | const int flags = msg->msg_flags; |
| 689 | const int noblock = flags & MSG_DONTWAIT; |
| 690 | struct sk_buff *skb; |
| 691 | int rc, size; |
| 692 | long timeo; |
| 693 | |
| 694 | if (len > dp->dccps_mss_cache) |
| 695 | return -EMSGSIZE; |
| 696 | |
| 697 | lock_sock(sk); |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 698 | |
| 699 | if (sysctl_dccp_tx_qlen && |
| 700 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { |
| 701 | rc = -EAGAIN; |
| 702 | goto out_release; |
| 703 | } |
| 704 | |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 705 | timeo = sock_sndtimeo(sk, noblock); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 706 | |
| 707 | /* |
| 708 | * We have to use sk_stream_wait_connect here to set sk_write_pending, |
| 709 | * so that the trick in dccp_rcv_request_sent_state_process. |
| 710 | */ |
| 711 | /* Wait for a connection to finish. */ |
Gerrit Renker | cecd8d0 | 2007-09-26 19:36:08 -0300 | [diff] [blame] | 712 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 713 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 714 | goto out_release; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 715 | |
| 716 | size = sk->sk_prot->max_header + len; |
| 717 | release_sock(sk); |
| 718 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
| 719 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 720 | if (skb == NULL) |
| 721 | goto out_release; |
| 722 | |
| 723 | skb_reserve(skb, sk->sk_prot->max_header); |
| 724 | rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 725 | if (rc != 0) |
| 726 | goto out_discard; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 727 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 728 | skb_queue_tail(&sk->sk_write_queue, skb); |
| 729 | dccp_write_xmit(sk,0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 730 | out_release: |
| 731 | release_sock(sk); |
| 732 | return rc ? : len; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 733 | out_discard: |
| 734 | kfree_skb(skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 735 | goto out_release; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 736 | } |
| 737 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 738 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
| 739 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 740 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 741 | size_t len, int nonblock, int flags, int *addr_len) |
| 742 | { |
| 743 | const struct dccp_hdr *dh; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 744 | long timeo; |
| 745 | |
| 746 | lock_sock(sk); |
| 747 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 748 | if (sk->sk_state == DCCP_LISTEN) { |
| 749 | len = -ENOTCONN; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 750 | goto out; |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 751 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 752 | |
| 753 | timeo = sock_rcvtimeo(sk, nonblock); |
| 754 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 755 | do { |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 756 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 757 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 758 | if (skb == NULL) |
| 759 | goto verify_sock_status; |
| 760 | |
| 761 | dh = dccp_hdr(skb); |
| 762 | |
| 763 | if (dh->dccph_type == DCCP_PKT_DATA || |
| 764 | dh->dccph_type == DCCP_PKT_DATAACK) |
| 765 | goto found_ok_skb; |
| 766 | |
| 767 | if (dh->dccph_type == DCCP_PKT_RESET || |
| 768 | dh->dccph_type == DCCP_PKT_CLOSE) { |
| 769 | dccp_pr_debug("found fin ok!\n"); |
| 770 | len = 0; |
| 771 | goto found_fin_ok; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 772 | } |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 773 | dccp_pr_debug("packet_type=%s\n", |
| 774 | dccp_packet_name(dh->dccph_type)); |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 775 | sk_eat_skb(sk, skb, 0); |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 776 | verify_sock_status: |
| 777 | if (sock_flag(sk, SOCK_DONE)) { |
| 778 | len = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 779 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 782 | if (sk->sk_err) { |
| 783 | len = sock_error(sk); |
| 784 | break; |
| 785 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 786 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 787 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
| 788 | len = 0; |
| 789 | break; |
| 790 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 791 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 792 | if (sk->sk_state == DCCP_CLOSED) { |
| 793 | if (!sock_flag(sk, SOCK_DONE)) { |
| 794 | /* This occurs when user tries to read |
| 795 | * from never connected socket. |
| 796 | */ |
| 797 | len = -ENOTCONN; |
| 798 | break; |
| 799 | } |
| 800 | len = 0; |
| 801 | break; |
| 802 | } |
| 803 | |
| 804 | if (!timeo) { |
| 805 | len = -EAGAIN; |
| 806 | break; |
| 807 | } |
| 808 | |
| 809 | if (signal_pending(current)) { |
| 810 | len = sock_intr_errno(timeo); |
| 811 | break; |
| 812 | } |
| 813 | |
| 814 | sk_wait_data(sk, &timeo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 815 | continue; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 816 | found_ok_skb: |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 817 | if (len > skb->len) |
| 818 | len = skb->len; |
| 819 | else if (len < skb->len) |
| 820 | msg->msg_flags |= MSG_TRUNC; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 821 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 822 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { |
| 823 | /* Exception. Bailout! */ |
| 824 | len = -EFAULT; |
| 825 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 826 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 827 | found_fin_ok: |
| 828 | if (!(flags & MSG_PEEK)) |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 829 | sk_eat_skb(sk, skb, 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 830 | break; |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 831 | } while (1); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 832 | out: |
| 833 | release_sock(sk); |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 834 | return len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 837 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
| 838 | |
| 839 | int inet_dccp_listen(struct socket *sock, int backlog) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 840 | { |
| 841 | struct sock *sk = sock->sk; |
| 842 | unsigned char old_state; |
| 843 | int err; |
| 844 | |
| 845 | lock_sock(sk); |
| 846 | |
| 847 | err = -EINVAL; |
| 848 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) |
| 849 | goto out; |
| 850 | |
| 851 | old_state = sk->sk_state; |
| 852 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) |
| 853 | goto out; |
| 854 | |
| 855 | /* Really, if the socket is already in listen state |
| 856 | * we can only allow the backlog to be adjusted. |
| 857 | */ |
| 858 | if (old_state != DCCP_LISTEN) { |
| 859 | /* |
| 860 | * FIXME: here it probably should be sk->sk_prot->listen_start |
| 861 | * see tcp_listen_start |
| 862 | */ |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 863 | err = dccp_listen_start(sk, backlog); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 864 | if (err) |
| 865 | goto out; |
| 866 | } |
| 867 | sk->sk_max_ack_backlog = backlog; |
| 868 | err = 0; |
| 869 | |
| 870 | out: |
| 871 | release_sock(sk); |
| 872 | return err; |
| 873 | } |
| 874 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 875 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
| 876 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 877 | static const unsigned char dccp_new_state[] = { |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 878 | /* current state: new state: action: */ |
| 879 | [0] = DCCP_CLOSED, |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 880 | [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 881 | [DCCP_REQUESTING] = DCCP_CLOSED, |
| 882 | [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN, |
| 883 | [DCCP_LISTEN] = DCCP_CLOSED, |
| 884 | [DCCP_RESPOND] = DCCP_CLOSED, |
| 885 | [DCCP_CLOSING] = DCCP_CLOSED, |
| 886 | [DCCP_TIME_WAIT] = DCCP_CLOSED, |
| 887 | [DCCP_CLOSED] = DCCP_CLOSED, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 888 | }; |
| 889 | |
| 890 | static int dccp_close_state(struct sock *sk) |
| 891 | { |
| 892 | const int next = dccp_new_state[sk->sk_state]; |
| 893 | const int ns = next & DCCP_STATE_MASK; |
| 894 | |
| 895 | if (ns != sk->sk_state) |
| 896 | dccp_set_state(sk, ns); |
| 897 | |
| 898 | return next & DCCP_ACTION_FIN; |
| 899 | } |
| 900 | |
| 901 | void dccp_close(struct sock *sk, long timeout) |
| 902 | { |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 903 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 904 | struct sk_buff *skb; |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 905 | u32 data_was_unread = 0; |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 906 | int state; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 907 | |
| 908 | lock_sock(sk); |
| 909 | |
| 910 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 911 | |
| 912 | if (sk->sk_state == DCCP_LISTEN) { |
| 913 | dccp_set_state(sk, DCCP_CLOSED); |
| 914 | |
| 915 | /* Special case. */ |
| 916 | inet_csk_listen_stop(sk); |
| 917 | |
| 918 | goto adjudge_to_death; |
| 919 | } |
| 920 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 921 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
| 922 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 923 | /* |
| 924 | * We need to flush the recv. buffs. We do this only on the |
| 925 | * descriptor close, not protocol-sourced closes, because the |
| 926 | *reader process may not have drained the data yet! |
| 927 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 928 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 929 | data_was_unread += skb->len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 930 | __kfree_skb(skb); |
| 931 | } |
| 932 | |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 933 | if (data_was_unread) { |
| 934 | /* Unread data was tossed, send an appropriate Reset Code */ |
| 935 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); |
| 936 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 937 | dccp_set_state(sk, DCCP_CLOSED); |
| 938 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 939 | /* Check zero linger _after_ checking for unread data. */ |
| 940 | sk->sk_prot->disconnect(sk, 0); |
| 941 | } else if (dccp_close_state(sk)) { |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 942 | dccp_send_close(sk, 1); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 943 | } |
| 944 | |
| 945 | sk_stream_wait_close(sk, timeout); |
| 946 | |
| 947 | adjudge_to_death: |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 948 | state = sk->sk_state; |
| 949 | sock_hold(sk); |
| 950 | sock_orphan(sk); |
| 951 | atomic_inc(sk->sk_prot->orphan_count); |
| 952 | |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 953 | /* |
| 954 | * It is the last release_sock in its life. It will remove backlog. |
| 955 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 956 | release_sock(sk); |
| 957 | /* |
| 958 | * Now socket is owned by kernel and we acquire BH lock |
| 959 | * to finish close. No need to check for user refs. |
| 960 | */ |
| 961 | local_bh_disable(); |
| 962 | bh_lock_sock(sk); |
| 963 | BUG_TRAP(!sock_owned_by_user(sk)); |
| 964 | |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 965 | /* Have we already been destroyed by a softirq or backlog? */ |
| 966 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) |
| 967 | goto out; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 968 | |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 969 | /* |
| 970 | * The last release_sock may have processed the CLOSE or RESET |
| 971 | * packet moving sock to CLOSED state, if not we have to fire |
| 972 | * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination" |
| 973 | * in draft-ietf-dccp-spec-11. -acme |
| 974 | */ |
| 975 | if (sk->sk_state == DCCP_CLOSING) { |
| 976 | /* FIXME: should start at 2 * RTT */ |
| 977 | /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */ |
| 978 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 979 | inet_csk(sk)->icsk_rto, |
| 980 | DCCP_RTO_MAX); |
| 981 | #if 0 |
| 982 | /* Yeah, we should use sk->sk_prot->orphan_count, etc */ |
| 983 | dccp_set_state(sk, DCCP_CLOSED); |
| 984 | #endif |
| 985 | } |
| 986 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 987 | if (sk->sk_state == DCCP_CLOSED) |
| 988 | inet_csk_destroy_sock(sk); |
| 989 | |
| 990 | /* Otherwise, socket is reprieved until protocol close. */ |
| 991 | |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 992 | out: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 993 | bh_unlock_sock(sk); |
| 994 | local_bh_enable(); |
| 995 | sock_put(sk); |
| 996 | } |
| 997 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 998 | EXPORT_SYMBOL_GPL(dccp_close); |
| 999 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1000 | void dccp_shutdown(struct sock *sk, int how) |
| 1001 | { |
Gerrit Renker | 8e8c71f | 2007-11-21 09:56:48 -0200 | [diff] [blame] | 1002 | dccp_pr_debug("called shutdown(%x)\n", how); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1003 | } |
| 1004 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 1005 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
| 1006 | |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1007 | static int __init dccp_mib_init(void) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1008 | { |
| 1009 | int rc = -ENOMEM; |
| 1010 | |
| 1011 | dccp_statistics[0] = alloc_percpu(struct dccp_mib); |
| 1012 | if (dccp_statistics[0] == NULL) |
| 1013 | goto out; |
| 1014 | |
| 1015 | dccp_statistics[1] = alloc_percpu(struct dccp_mib); |
| 1016 | if (dccp_statistics[1] == NULL) |
| 1017 | goto out_free_one; |
| 1018 | |
| 1019 | rc = 0; |
| 1020 | out: |
| 1021 | return rc; |
| 1022 | out_free_one: |
| 1023 | free_percpu(dccp_statistics[0]); |
| 1024 | dccp_statistics[0] = NULL; |
| 1025 | goto out; |
| 1026 | |
| 1027 | } |
| 1028 | |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1029 | static void dccp_mib_exit(void) |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1030 | { |
| 1031 | free_percpu(dccp_statistics[0]); |
| 1032 | free_percpu(dccp_statistics[1]); |
| 1033 | dccp_statistics[0] = dccp_statistics[1] = NULL; |
| 1034 | } |
| 1035 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1036 | static int thash_entries; |
| 1037 | module_param(thash_entries, int, 0444); |
| 1038 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); |
| 1039 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 1040 | #ifdef CONFIG_IP_DCCP_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1041 | int dccp_debug; |
Gerrit Renker | 042d18f | 2007-10-04 14:39:53 -0700 | [diff] [blame] | 1042 | module_param(dccp_debug, bool, 0444); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1043 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 1044 | |
| 1045 | EXPORT_SYMBOL_GPL(dccp_debug); |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 1046 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1047 | |
| 1048 | static int __init dccp_init(void) |
| 1049 | { |
| 1050 | unsigned long goal; |
| 1051 | int ehash_order, bhash_order, i; |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1052 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1053 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1054 | dccp_hashinfo.bind_bucket_cachep = |
| 1055 | kmem_cache_create("dccp_bind_bucket", |
| 1056 | sizeof(struct inet_bind_bucket), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1057 | SLAB_HWCACHE_ALIGN, NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1058 | if (!dccp_hashinfo.bind_bucket_cachep) |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1059 | goto out; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1060 | |
| 1061 | /* |
| 1062 | * Size and allocate the main established and bind bucket |
| 1063 | * hash tables. |
| 1064 | * |
| 1065 | * The methodology is similar to that of the buffer cache. |
| 1066 | */ |
| 1067 | if (num_physpages >= (128 * 1024)) |
| 1068 | goal = num_physpages >> (21 - PAGE_SHIFT); |
| 1069 | else |
| 1070 | goal = num_physpages >> (23 - PAGE_SHIFT); |
| 1071 | |
| 1072 | if (thash_entries) |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1073 | goal = (thash_entries * |
| 1074 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1075 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
| 1076 | ; |
| 1077 | do { |
| 1078 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / |
| 1079 | sizeof(struct inet_ehash_bucket); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1080 | while (dccp_hashinfo.ehash_size & |
| 1081 | (dccp_hashinfo.ehash_size - 1)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1082 | dccp_hashinfo.ehash_size--; |
| 1083 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) |
| 1084 | __get_free_pages(GFP_ATOMIC, ehash_order); |
| 1085 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); |
| 1086 | |
| 1087 | if (!dccp_hashinfo.ehash) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1088 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1089 | goto out_free_bind_bucket_cachep; |
| 1090 | } |
| 1091 | |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 1092 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1093 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 1094 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1095 | } |
| 1096 | |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1097 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
| 1098 | goto out_free_dccp_ehash; |
| 1099 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1100 | bhash_order = ehash_order; |
| 1101 | |
| 1102 | do { |
| 1103 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / |
| 1104 | sizeof(struct inet_bind_hashbucket); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1105 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
| 1106 | bhash_order > 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1107 | continue; |
| 1108 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) |
| 1109 | __get_free_pages(GFP_ATOMIC, bhash_order); |
| 1110 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); |
| 1111 | |
| 1112 | if (!dccp_hashinfo.bhash) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1113 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1114 | goto out_free_dccp_locks; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1115 | } |
| 1116 | |
| 1117 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { |
| 1118 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); |
| 1119 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); |
| 1120 | } |
| 1121 | |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1122 | rc = dccp_mib_init(); |
Arnaldo Carvalho de Melo | fa23e2e | 2006-03-20 17:16:01 -0800 | [diff] [blame] | 1123 | if (rc) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1124 | goto out_free_dccp_bhash; |
| 1125 | |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1126 | rc = dccp_ackvec_init(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1127 | if (rc) |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1128 | goto out_free_dccp_mib; |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1129 | |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 1130 | rc = dccp_sysctl_init(); |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1131 | if (rc) |
| 1132 | goto out_ackvec_exit; |
Gerrit Renker | 4c70f38 | 2007-09-25 22:40:13 -0700 | [diff] [blame] | 1133 | |
| 1134 | dccp_timestamping_init(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1135 | out: |
| 1136 | return rc; |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1137 | out_ackvec_exit: |
| 1138 | dccp_ackvec_exit(); |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1139 | out_free_dccp_mib: |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1140 | dccp_mib_exit(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1141 | out_free_dccp_bhash: |
| 1142 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); |
| 1143 | dccp_hashinfo.bhash = NULL; |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1144 | out_free_dccp_locks: |
| 1145 | inet_ehash_locks_free(&dccp_hashinfo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1146 | out_free_dccp_ehash: |
| 1147 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); |
| 1148 | dccp_hashinfo.ehash = NULL; |
| 1149 | out_free_bind_bucket_cachep: |
| 1150 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
| 1151 | dccp_hashinfo.bind_bucket_cachep = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1152 | goto out; |
| 1153 | } |
| 1154 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1155 | static void __exit dccp_fini(void) |
| 1156 | { |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1157 | dccp_mib_exit(); |
Arnaldo Carvalho de Melo | 725ba8e | 2005-08-13 20:35:39 -0300 | [diff] [blame] | 1158 | free_pages((unsigned long)dccp_hashinfo.bhash, |
| 1159 | get_order(dccp_hashinfo.bhash_size * |
| 1160 | sizeof(struct inet_bind_hashbucket))); |
| 1161 | free_pages((unsigned long)dccp_hashinfo.ehash, |
| 1162 | get_order(dccp_hashinfo.ehash_size * |
| 1163 | sizeof(struct inet_ehash_bucket))); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1164 | inet_ehash_locks_free(&dccp_hashinfo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1165 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1166 | dccp_ackvec_exit(); |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 1167 | dccp_sysctl_exit(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1168 | } |
| 1169 | |
| 1170 | module_init(dccp_init); |
| 1171 | module_exit(dccp_fini); |
| 1172 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1173 | MODULE_LICENSE("GPL"); |
| 1174 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); |
| 1175 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |