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 <linux/spinlock.h> |
| 31 | #include <linux/timer.h> |
| 32 | #include <linux/delay.h> |
| 33 | #include <linux/poll.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 34 | |
| 35 | #include "ccid.h" |
| 36 | #include "dccp.h" |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 37 | #include "feat.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 38 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 39 | DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 40 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 41 | EXPORT_SYMBOL_GPL(dccp_statistics); |
| 42 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 43 | atomic_t dccp_orphan_count = ATOMIC_INIT(0); |
| 44 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 45 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
| 46 | |
Arnaldo Carvalho de Melo | 075ae86 | 2006-03-20 21:24:19 -0800 | [diff] [blame] | 47 | struct inet_hashinfo __cacheline_aligned dccp_hashinfo = { |
| 48 | .lhash_lock = RW_LOCK_UNLOCKED, |
| 49 | .lhash_users = ATOMIC_INIT(0), |
| 50 | .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait), |
| 51 | }; |
| 52 | |
| 53 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
| 54 | |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 55 | /* the maximum queue length for tx in packets. 0 is no limit */ |
| 56 | int sysctl_dccp_tx_qlen __read_mostly = 5; |
| 57 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 58 | void dccp_set_state(struct sock *sk, const int state) |
| 59 | { |
| 60 | const int oldstate = sk->sk_state; |
| 61 | |
Gerrit Renker | f11135a | 2007-11-28 11:34:53 -0200 | [diff] [blame] | 62 | dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk, |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 63 | dccp_state_name(oldstate), dccp_state_name(state)); |
| 64 | WARN_ON(state == oldstate); |
| 65 | |
| 66 | switch (state) { |
| 67 | case DCCP_OPEN: |
| 68 | if (oldstate != DCCP_OPEN) |
| 69 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); |
| 70 | break; |
| 71 | |
| 72 | case DCCP_CLOSED: |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 73 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
| 74 | oldstate == DCCP_CLOSING) |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 75 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
| 76 | |
| 77 | sk->sk_prot->unhash(sk); |
| 78 | if (inet_csk(sk)->icsk_bind_hash != NULL && |
| 79 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 80 | inet_put_port(sk); |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 81 | /* fall through */ |
| 82 | default: |
| 83 | if (oldstate == DCCP_OPEN) |
| 84 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); |
| 85 | } |
| 86 | |
| 87 | /* Change state AFTER socket is unhashed to avoid closed |
| 88 | * socket sitting in hash tables. |
| 89 | */ |
| 90 | sk->sk_state = state; |
| 91 | } |
| 92 | |
| 93 | EXPORT_SYMBOL_GPL(dccp_set_state); |
| 94 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 95 | static void dccp_finish_passive_close(struct sock *sk) |
| 96 | { |
| 97 | switch (sk->sk_state) { |
| 98 | case DCCP_PASSIVE_CLOSE: |
| 99 | /* Node (client or server) has received Close packet. */ |
| 100 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); |
| 101 | dccp_set_state(sk, DCCP_CLOSED); |
| 102 | break; |
| 103 | case DCCP_PASSIVE_CLOSEREQ: |
| 104 | /* |
| 105 | * Client received CloseReq. We set the `active' flag so that |
| 106 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. |
| 107 | */ |
| 108 | dccp_send_close(sk, 1); |
| 109 | dccp_set_state(sk, DCCP_CLOSING); |
| 110 | } |
| 111 | } |
| 112 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 113 | void dccp_done(struct sock *sk) |
| 114 | { |
| 115 | dccp_set_state(sk, DCCP_CLOSED); |
| 116 | dccp_clear_xmit_timers(sk); |
| 117 | |
| 118 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 119 | |
| 120 | if (!sock_flag(sk, SOCK_DEAD)) |
| 121 | sk->sk_state_change(sk); |
| 122 | else |
| 123 | inet_csk_destroy_sock(sk); |
| 124 | } |
| 125 | |
| 126 | EXPORT_SYMBOL_GPL(dccp_done); |
| 127 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 128 | const char *dccp_packet_name(const int type) |
| 129 | { |
| 130 | static const char *dccp_packet_names[] = { |
| 131 | [DCCP_PKT_REQUEST] = "REQUEST", |
| 132 | [DCCP_PKT_RESPONSE] = "RESPONSE", |
| 133 | [DCCP_PKT_DATA] = "DATA", |
| 134 | [DCCP_PKT_ACK] = "ACK", |
| 135 | [DCCP_PKT_DATAACK] = "DATAACK", |
| 136 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", |
| 137 | [DCCP_PKT_CLOSE] = "CLOSE", |
| 138 | [DCCP_PKT_RESET] = "RESET", |
| 139 | [DCCP_PKT_SYNC] = "SYNC", |
| 140 | [DCCP_PKT_SYNCACK] = "SYNCACK", |
| 141 | }; |
| 142 | |
| 143 | if (type >= DCCP_NR_PKT_TYPES) |
| 144 | return "INVALID"; |
| 145 | else |
| 146 | return dccp_packet_names[type]; |
| 147 | } |
| 148 | |
| 149 | EXPORT_SYMBOL_GPL(dccp_packet_name); |
| 150 | |
| 151 | const char *dccp_state_name(const int state) |
| 152 | { |
| 153 | static char *dccp_state_names[] = { |
Gerrit Renker | f11135a | 2007-11-28 11:34:53 -0200 | [diff] [blame] | 154 | [DCCP_OPEN] = "OPEN", |
| 155 | [DCCP_REQUESTING] = "REQUESTING", |
| 156 | [DCCP_PARTOPEN] = "PARTOPEN", |
| 157 | [DCCP_LISTEN] = "LISTEN", |
| 158 | [DCCP_RESPOND] = "RESPOND", |
| 159 | [DCCP_CLOSING] = "CLOSING", |
| 160 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", |
| 161 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", |
| 162 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", |
| 163 | [DCCP_TIME_WAIT] = "TIME_WAIT", |
| 164 | [DCCP_CLOSED] = "CLOSED", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 165 | }; |
| 166 | |
| 167 | if (state >= DCCP_MAX_STATES) |
| 168 | return "INVALID STATE!"; |
| 169 | else |
| 170 | return dccp_state_names[state]; |
| 171 | } |
| 172 | |
| 173 | EXPORT_SYMBOL_GPL(dccp_state_name); |
| 174 | |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 175 | 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] | 176 | { |
| 177 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 178 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 179 | struct inet_connection_sock *icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 180 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 181 | dccp_minisock_init(&dp->dccps_minisock); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 182 | |
Arnaldo Carvalho de Melo | e18d7a9 | 2007-11-24 21:42:53 -0200 | [diff] [blame] | 183 | icsk->icsk_rto = DCCP_TIMEOUT_INIT; |
| 184 | icsk->icsk_syn_retries = sysctl_dccp_request_retries; |
| 185 | sk->sk_state = DCCP_CLOSED; |
| 186 | sk->sk_write_space = dccp_write_space; |
| 187 | icsk->icsk_sync_mss = dccp_sync_mss; |
| 188 | dp->dccps_mss_cache = 536; |
| 189 | dp->dccps_rate_last = jiffies; |
| 190 | dp->dccps_role = DCCP_ROLE_UNDEFINED; |
| 191 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; |
| 192 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
| 193 | |
| 194 | dccp_init_xmit_timers(sk); |
| 195 | |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 196 | /* |
| 197 | * FIXME: We're hardcoding the CCID, and doing this at this point makes |
| 198 | * the listening (master) sock get CCID control blocks, which is not |
| 199 | * necessary, but for now, to not mess with the test userspace apps, |
| 200 | * lets leave it here, later the real solution is to do this in a |
| 201 | * setsockopt(CCIDs-I-want/accept). -acme |
| 202 | */ |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 203 | if (likely(ctl_sock_initialized)) { |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 204 | int rc = dccp_feat_init(dmsk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 205 | |
| 206 | if (rc) |
| 207 | return rc; |
| 208 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 209 | if (dmsk->dccpms_send_ack_vector) { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 210 | dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL); |
| 211 | if (dp->dccps_hc_rx_ackvec == NULL) |
| 212 | return -ENOMEM; |
| 213 | } |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 214 | dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid, |
| 215 | sk, GFP_KERNEL); |
| 216 | dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid, |
| 217 | sk, GFP_KERNEL); |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 218 | if (unlikely(dp->dccps_hc_rx_ccid == NULL || |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 219 | dp->dccps_hc_tx_ccid == NULL)) { |
| 220 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
| 221 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 222 | if (dmsk->dccpms_send_ack_vector) { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 223 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
| 224 | dp->dccps_hc_rx_ackvec = NULL; |
| 225 | } |
| 226 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; |
| 227 | return -ENOMEM; |
| 228 | } |
| 229 | } else { |
| 230 | /* control socket doesn't need feat nego */ |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 231 | INIT_LIST_HEAD(&dmsk->dccpms_pending); |
| 232 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 233 | } |
| 234 | |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | EXPORT_SYMBOL_GPL(dccp_init_sock); |
| 239 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 240 | void dccp_destroy_sock(struct sock *sk) |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 241 | { |
| 242 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 243 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 244 | |
| 245 | /* |
| 246 | * DCCP doesn't use sk_write_queue, just sk_send_head |
| 247 | * for retransmissions |
| 248 | */ |
| 249 | if (sk->sk_send_head != NULL) { |
| 250 | kfree_skb(sk->sk_send_head); |
| 251 | sk->sk_send_head = NULL; |
| 252 | } |
| 253 | |
| 254 | /* Clean up a referenced DCCP bind bucket. */ |
| 255 | if (inet_csk(sk)->icsk_bind_hash != NULL) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 256 | inet_put_port(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 257 | |
| 258 | kfree(dp->dccps_service_list); |
| 259 | dp->dccps_service_list = NULL; |
| 260 | |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 261 | if (dmsk->dccpms_send_ack_vector) { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 262 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
| 263 | dp->dccps_hc_rx_ackvec = NULL; |
| 264 | } |
| 265 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
| 266 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); |
| 267 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; |
| 268 | |
| 269 | /* clean up feature negotiation state */ |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 270 | dccp_feat_clean(dmsk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); |
| 274 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 275 | 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] | 276 | { |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 277 | struct dccp_sock *dp = dccp_sk(sk); |
| 278 | |
| 279 | dp->dccps_role = DCCP_ROLE_LISTEN; |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 280 | return inet_csk_listen_start(sk, backlog); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame] | 283 | static inline int dccp_need_reset(int state) |
| 284 | { |
| 285 | return state != DCCP_CLOSED && state != DCCP_LISTEN && |
| 286 | state != DCCP_REQUESTING; |
| 287 | } |
| 288 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 289 | int dccp_disconnect(struct sock *sk, int flags) |
| 290 | { |
| 291 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 292 | struct inet_sock *inet = inet_sk(sk); |
| 293 | int err = 0; |
| 294 | const int old_state = sk->sk_state; |
| 295 | |
| 296 | if (old_state != DCCP_CLOSED) |
| 297 | dccp_set_state(sk, DCCP_CLOSED); |
| 298 | |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame] | 299 | /* |
| 300 | * This corresponds to the ABORT function of RFC793, sec. 3.8 |
| 301 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". |
| 302 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 303 | if (old_state == DCCP_LISTEN) { |
| 304 | inet_csk_listen_stop(sk); |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame] | 305 | } else if (dccp_need_reset(old_state)) { |
| 306 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 307 | sk->sk_err = ECONNRESET; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 308 | } else if (old_state == DCCP_REQUESTING) |
| 309 | sk->sk_err = ECONNRESET; |
| 310 | |
| 311 | dccp_clear_xmit_timers(sk); |
| 312 | __skb_queue_purge(&sk->sk_receive_queue); |
| 313 | if (sk->sk_send_head != NULL) { |
| 314 | __kfree_skb(sk->sk_send_head); |
| 315 | sk->sk_send_head = NULL; |
| 316 | } |
| 317 | |
| 318 | inet->dport = 0; |
| 319 | |
| 320 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 321 | inet_reset_saddr(sk); |
| 322 | |
| 323 | sk->sk_shutdown = 0; |
| 324 | sock_reset_flag(sk, SOCK_DONE); |
| 325 | |
| 326 | icsk->icsk_backoff = 0; |
| 327 | inet_csk_delack_init(sk); |
| 328 | __sk_dst_reset(sk); |
| 329 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 330 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 331 | |
| 332 | sk->sk_error_report(sk); |
| 333 | return err; |
| 334 | } |
| 335 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 336 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
| 337 | |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 338 | /* |
| 339 | * Wait for a DCCP event. |
| 340 | * |
| 341 | * Note that we don't need to lock the socket, as the upper poll layers |
| 342 | * take care of normal races (between the test and the event) and we don't |
| 343 | * go look at any of the socket buffers directly. |
| 344 | */ |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 345 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
| 346 | poll_table *wait) |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 347 | { |
| 348 | unsigned int mask; |
| 349 | struct sock *sk = sock->sk; |
| 350 | |
| 351 | poll_wait(file, sk->sk_sleep, wait); |
| 352 | if (sk->sk_state == DCCP_LISTEN) |
| 353 | return inet_csk_listen_poll(sk); |
| 354 | |
| 355 | /* Socket is not locked. We are protected from async events |
| 356 | by poll logic and correct handling of state changes |
| 357 | made by another threads is impossible in any case. |
| 358 | */ |
| 359 | |
| 360 | mask = 0; |
| 361 | if (sk->sk_err) |
| 362 | mask = POLLERR; |
| 363 | |
| 364 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) |
| 365 | mask |= POLLHUP; |
| 366 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 367 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 368 | |
| 369 | /* Connected? */ |
| 370 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { |
| 371 | if (atomic_read(&sk->sk_rmem_alloc) > 0) |
| 372 | mask |= POLLIN | POLLRDNORM; |
| 373 | |
| 374 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 375 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
| 376 | mask |= POLLOUT | POLLWRNORM; |
| 377 | } else { /* send SIGIO later */ |
| 378 | set_bit(SOCK_ASYNC_NOSPACE, |
| 379 | &sk->sk_socket->flags); |
| 380 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 381 | |
| 382 | /* Race breaker. If space is freed after |
| 383 | * wspace test but before the flags are set, |
| 384 | * IO signal will be lost. |
| 385 | */ |
| 386 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
| 387 | mask |= POLLOUT | POLLWRNORM; |
| 388 | } |
| 389 | } |
| 390 | } |
| 391 | return mask; |
| 392 | } |
| 393 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 394 | EXPORT_SYMBOL_GPL(dccp_poll); |
| 395 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 396 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 397 | { |
Arnaldo Carvalho de Melo | 6273172 | 2007-10-23 20:23:30 -0700 | [diff] [blame] | 398 | int rc = -ENOTCONN; |
| 399 | |
| 400 | lock_sock(sk); |
| 401 | |
| 402 | if (sk->sk_state == DCCP_LISTEN) |
| 403 | goto out; |
| 404 | |
| 405 | switch (cmd) { |
| 406 | case SIOCINQ: { |
| 407 | struct sk_buff *skb; |
| 408 | unsigned long amount = 0; |
| 409 | |
| 410 | skb = skb_peek(&sk->sk_receive_queue); |
| 411 | if (skb != NULL) { |
| 412 | /* |
| 413 | * We will only return the amount of this packet since |
| 414 | * that is all that will be read. |
| 415 | */ |
| 416 | amount = skb->len; |
| 417 | } |
| 418 | rc = put_user(amount, (int __user *)arg); |
| 419 | } |
| 420 | break; |
| 421 | default: |
| 422 | rc = -ENOIOCTLCMD; |
| 423 | break; |
| 424 | } |
| 425 | out: |
| 426 | release_sock(sk); |
| 427 | return rc; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 428 | } |
| 429 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 430 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
| 431 | |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 432 | 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] | 433 | char __user *optval, int optlen) |
| 434 | { |
| 435 | struct dccp_sock *dp = dccp_sk(sk); |
| 436 | struct dccp_service_list *sl = NULL; |
| 437 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 438 | if (service == DCCP_SERVICE_INVALID_VALUE || |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 439 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
| 440 | return -EINVAL; |
| 441 | |
| 442 | if (optlen > sizeof(service)) { |
| 443 | sl = kmalloc(optlen, GFP_KERNEL); |
| 444 | if (sl == NULL) |
| 445 | return -ENOMEM; |
| 446 | |
| 447 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; |
| 448 | if (copy_from_user(sl->dccpsl_list, |
| 449 | optval + sizeof(service), |
| 450 | optlen - sizeof(service)) || |
| 451 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { |
| 452 | kfree(sl); |
| 453 | return -EFAULT; |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | lock_sock(sk); |
| 458 | dp->dccps_service = service; |
| 459 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 460 | kfree(dp->dccps_service_list); |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 461 | |
| 462 | dp->dccps_service_list = sl; |
| 463 | release_sock(sk); |
| 464 | return 0; |
| 465 | } |
| 466 | |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 467 | /* byte 1 is feature. the rest is the preference list */ |
| 468 | static int dccp_setsockopt_change(struct sock *sk, int type, |
| 469 | struct dccp_so_feat __user *optval) |
| 470 | { |
| 471 | struct dccp_so_feat opt; |
| 472 | u8 *val; |
| 473 | int rc; |
| 474 | |
| 475 | if (copy_from_user(&opt, optval, sizeof(opt))) |
| 476 | return -EFAULT; |
| 477 | |
| 478 | val = kmalloc(opt.dccpsf_len, GFP_KERNEL); |
| 479 | if (!val) |
| 480 | return -ENOMEM; |
| 481 | |
| 482 | if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) { |
| 483 | rc = -EFAULT; |
| 484 | goto out_free_val; |
| 485 | } |
| 486 | |
Arnaldo Carvalho de Melo | 8ca0d17 | 2006-03-20 22:51:53 -0800 | [diff] [blame] | 487 | rc = dccp_feat_change(dccp_msk(sk), type, opt.dccpsf_feat, |
| 488 | val, opt.dccpsf_len, GFP_KERNEL); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 489 | if (rc) |
| 490 | goto out_free_val; |
| 491 | |
| 492 | out: |
| 493 | return rc; |
| 494 | |
| 495 | out_free_val: |
| 496 | kfree(val); |
| 497 | goto out; |
| 498 | } |
| 499 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 500 | static int do_dccp_setsockopt(struct sock *sk, int level, int optname, |
| 501 | char __user *optval, int optlen) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 502 | { |
Gerrit Renker | 09dbc38 | 2006-11-14 12:57:34 -0200 | [diff] [blame] | 503 | struct dccp_sock *dp = dccp_sk(sk); |
| 504 | int val, err = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 505 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 506 | if (optlen < sizeof(int)) |
| 507 | return -EINVAL; |
| 508 | |
| 509 | if (get_user(val, (int __user *)optval)) |
| 510 | return -EFAULT; |
| 511 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 512 | if (optname == DCCP_SOCKOPT_SERVICE) |
| 513 | return dccp_setsockopt_service(sk, val, optval, optlen); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 514 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 515 | lock_sock(sk); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 516 | switch (optname) { |
| 517 | case DCCP_SOCKOPT_PACKET_SIZE: |
Gerrit Renker | 5aed324 | 2006-11-28 19:33:36 -0200 | [diff] [blame] | 518 | 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] | 519 | err = 0; |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 520 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 521 | case DCCP_SOCKOPT_CHANGE_L: |
| 522 | if (optlen != sizeof(struct dccp_so_feat)) |
| 523 | err = -EINVAL; |
| 524 | else |
| 525 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 526 | (struct dccp_so_feat __user *) |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 527 | optval); |
| 528 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 529 | case DCCP_SOCKOPT_CHANGE_R: |
| 530 | if (optlen != sizeof(struct dccp_so_feat)) |
| 531 | err = -EINVAL; |
| 532 | else |
| 533 | err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R, |
Alan Cox | 9faefb6 | 2006-07-10 14:24:23 -0700 | [diff] [blame] | 534 | (struct dccp_so_feat __user *) |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 535 | optval); |
| 536 | break; |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 537 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
| 538 | if (dp->dccps_role != DCCP_ROLE_SERVER) |
| 539 | err = -EOPNOTSUPP; |
| 540 | else |
| 541 | dp->dccps_server_timewait = (val != 0); |
| 542 | break; |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 543 | case DCCP_SOCKOPT_SEND_CSCOV: /* sender side, RFC 4340, sec. 9.2 */ |
| 544 | if (val < 0 || val > 15) |
| 545 | err = -EINVAL; |
| 546 | else |
| 547 | dp->dccps_pcslen = val; |
| 548 | break; |
| 549 | case DCCP_SOCKOPT_RECV_CSCOV: /* receiver side, RFC 4340 sec. 9.2.1 */ |
| 550 | if (val < 0 || val > 15) |
| 551 | err = -EINVAL; |
| 552 | else { |
| 553 | dp->dccps_pcrlen = val; |
| 554 | /* FIXME: add feature negotiation, |
| 555 | * ChangeL(MinimumChecksumCoverage, val) */ |
| 556 | } |
| 557 | break; |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 558 | default: |
| 559 | err = -ENOPROTOOPT; |
| 560 | break; |
| 561 | } |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 562 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 563 | release_sock(sk); |
| 564 | return err; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 567 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
| 568 | char __user *optval, int optlen) |
| 569 | { |
| 570 | if (level != SOL_DCCP) |
| 571 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, |
| 572 | optname, optval, |
| 573 | optlen); |
| 574 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 575 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 576 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 577 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
| 578 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 579 | #ifdef CONFIG_COMPAT |
| 580 | 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] | 581 | char __user *optval, int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 582 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 583 | if (level != SOL_DCCP) |
| 584 | return inet_csk_compat_setsockopt(sk, level, optname, |
| 585 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 586 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 587 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 588 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 589 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
| 590 | #endif |
| 591 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 592 | static int dccp_getsockopt_service(struct sock *sk, int len, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 593 | __be32 __user *optval, |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 594 | int __user *optlen) |
| 595 | { |
| 596 | const struct dccp_sock *dp = dccp_sk(sk); |
| 597 | const struct dccp_service_list *sl; |
| 598 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); |
| 599 | |
| 600 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 601 | if ((sl = dp->dccps_service_list) != NULL) { |
| 602 | slen = sl->dccpsl_nr * sizeof(u32); |
| 603 | total_len += slen; |
| 604 | } |
| 605 | |
| 606 | err = -EINVAL; |
| 607 | if (total_len > len) |
| 608 | goto out; |
| 609 | |
| 610 | err = 0; |
| 611 | if (put_user(total_len, optlen) || |
| 612 | put_user(dp->dccps_service, optval) || |
| 613 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) |
| 614 | err = -EFAULT; |
| 615 | out: |
| 616 | release_sock(sk); |
| 617 | return err; |
| 618 | } |
| 619 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 620 | 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] | 621 | char __user *optval, int __user *optlen) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 622 | { |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 623 | struct dccp_sock *dp; |
| 624 | int val, len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 625 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 626 | if (get_user(len, optlen)) |
| 627 | return -EFAULT; |
| 628 | |
Arnaldo Carvalho de Melo | 39ebc02 | 2007-03-28 11:54:32 -0700 | [diff] [blame] | 629 | if (len < (int)sizeof(int)) |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 630 | return -EINVAL; |
| 631 | |
| 632 | dp = dccp_sk(sk); |
| 633 | |
| 634 | switch (optname) { |
| 635 | case DCCP_SOCKOPT_PACKET_SIZE: |
Gerrit Renker | 5aed324 | 2006-11-28 19:33:36 -0200 | [diff] [blame] | 636 | 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] | 637 | return 0; |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 638 | case DCCP_SOCKOPT_SERVICE: |
| 639 | return dccp_getsockopt_service(sk, len, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 640 | (__be32 __user *)optval, optlen); |
Gerrit Renker | 7c559a9 | 2007-10-04 14:39:22 -0700 | [diff] [blame] | 641 | case DCCP_SOCKOPT_GET_CUR_MPS: |
| 642 | val = dp->dccps_mss_cache; |
Gerrit Renker | 7c559a9 | 2007-10-04 14:39:22 -0700 | [diff] [blame] | 643 | break; |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 644 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
| 645 | val = dp->dccps_server_timewait; |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 646 | break; |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 647 | case DCCP_SOCKOPT_SEND_CSCOV: |
| 648 | val = dp->dccps_pcslen; |
| 649 | break; |
| 650 | case DCCP_SOCKOPT_RECV_CSCOV: |
| 651 | val = dp->dccps_pcrlen; |
| 652 | break; |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 653 | case 128 ... 191: |
| 654 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, |
| 655 | len, (u32 __user *)optval, optlen); |
| 656 | case 192 ... 255: |
| 657 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, |
| 658 | len, (u32 __user *)optval, optlen); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 659 | default: |
| 660 | return -ENOPROTOOPT; |
| 661 | } |
| 662 | |
Gerrit Renker | 7913350 | 2007-12-13 12:27:14 -0200 | [diff] [blame] | 663 | len = sizeof(val); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 664 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
| 665 | return -EFAULT; |
| 666 | |
| 667 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 668 | } |
| 669 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 670 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
| 671 | char __user *optval, int __user *optlen) |
| 672 | { |
| 673 | if (level != SOL_DCCP) |
| 674 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, |
| 675 | optname, optval, |
| 676 | optlen); |
| 677 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 678 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 679 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 680 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
| 681 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 682 | #ifdef CONFIG_COMPAT |
| 683 | 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] | 684 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 685 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 686 | if (level != SOL_DCCP) |
| 687 | return inet_csk_compat_getsockopt(sk, level, optname, |
| 688 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 689 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 690 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 691 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 692 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
| 693 | #endif |
| 694 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 695 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 696 | size_t len) |
| 697 | { |
| 698 | const struct dccp_sock *dp = dccp_sk(sk); |
| 699 | const int flags = msg->msg_flags; |
| 700 | const int noblock = flags & MSG_DONTWAIT; |
| 701 | struct sk_buff *skb; |
| 702 | int rc, size; |
| 703 | long timeo; |
| 704 | |
| 705 | if (len > dp->dccps_mss_cache) |
| 706 | return -EMSGSIZE; |
| 707 | |
| 708 | lock_sock(sk); |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 709 | |
| 710 | if (sysctl_dccp_tx_qlen && |
| 711 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { |
| 712 | rc = -EAGAIN; |
| 713 | goto out_release; |
| 714 | } |
| 715 | |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 716 | timeo = sock_sndtimeo(sk, noblock); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 717 | |
| 718 | /* |
| 719 | * We have to use sk_stream_wait_connect here to set sk_write_pending, |
| 720 | * so that the trick in dccp_rcv_request_sent_state_process. |
| 721 | */ |
| 722 | /* Wait for a connection to finish. */ |
Gerrit Renker | cecd8d0 | 2007-09-26 19:36:08 -0300 | [diff] [blame] | 723 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 724 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 725 | goto out_release; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 726 | |
| 727 | size = sk->sk_prot->max_header + len; |
| 728 | release_sock(sk); |
| 729 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
| 730 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 731 | if (skb == NULL) |
| 732 | goto out_release; |
| 733 | |
| 734 | skb_reserve(skb, sk->sk_prot->max_header); |
| 735 | 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] | 736 | if (rc != 0) |
| 737 | goto out_discard; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 738 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 739 | skb_queue_tail(&sk->sk_write_queue, skb); |
| 740 | dccp_write_xmit(sk,0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 741 | out_release: |
| 742 | release_sock(sk); |
| 743 | return rc ? : len; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 744 | out_discard: |
| 745 | kfree_skb(skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 746 | goto out_release; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 747 | } |
| 748 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 749 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
| 750 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 751 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 752 | size_t len, int nonblock, int flags, int *addr_len) |
| 753 | { |
| 754 | const struct dccp_hdr *dh; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 755 | long timeo; |
| 756 | |
| 757 | lock_sock(sk); |
| 758 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 759 | if (sk->sk_state == DCCP_LISTEN) { |
| 760 | len = -ENOTCONN; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 761 | goto out; |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 762 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 763 | |
| 764 | timeo = sock_rcvtimeo(sk, nonblock); |
| 765 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 766 | do { |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 767 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 768 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 769 | if (skb == NULL) |
| 770 | goto verify_sock_status; |
| 771 | |
| 772 | dh = dccp_hdr(skb); |
| 773 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 774 | switch (dh->dccph_type) { |
| 775 | case DCCP_PKT_DATA: |
| 776 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 777 | goto found_ok_skb; |
| 778 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 779 | case DCCP_PKT_CLOSE: |
| 780 | case DCCP_PKT_CLOSEREQ: |
| 781 | if (!(flags & MSG_PEEK)) |
| 782 | dccp_finish_passive_close(sk); |
| 783 | /* fall through */ |
| 784 | case DCCP_PKT_RESET: |
| 785 | dccp_pr_debug("found fin (%s) ok!\n", |
| 786 | dccp_packet_name(dh->dccph_type)); |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 787 | len = 0; |
| 788 | goto found_fin_ok; |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 789 | default: |
| 790 | dccp_pr_debug("packet_type=%s\n", |
| 791 | dccp_packet_name(dh->dccph_type)); |
| 792 | sk_eat_skb(sk, skb, 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 793 | } |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 794 | verify_sock_status: |
| 795 | if (sock_flag(sk, SOCK_DONE)) { |
| 796 | len = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 797 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 798 | } |
| 799 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 800 | if (sk->sk_err) { |
| 801 | len = sock_error(sk); |
| 802 | break; |
| 803 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 804 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 805 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
| 806 | len = 0; |
| 807 | break; |
| 808 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 809 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 810 | if (sk->sk_state == DCCP_CLOSED) { |
| 811 | if (!sock_flag(sk, SOCK_DONE)) { |
| 812 | /* This occurs when user tries to read |
| 813 | * from never connected socket. |
| 814 | */ |
| 815 | len = -ENOTCONN; |
| 816 | break; |
| 817 | } |
| 818 | len = 0; |
| 819 | break; |
| 820 | } |
| 821 | |
| 822 | if (!timeo) { |
| 823 | len = -EAGAIN; |
| 824 | break; |
| 825 | } |
| 826 | |
| 827 | if (signal_pending(current)) { |
| 828 | len = sock_intr_errno(timeo); |
| 829 | break; |
| 830 | } |
| 831 | |
| 832 | sk_wait_data(sk, &timeo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 833 | continue; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 834 | found_ok_skb: |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 835 | if (len > skb->len) |
| 836 | len = skb->len; |
| 837 | else if (len < skb->len) |
| 838 | msg->msg_flags |= MSG_TRUNC; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 839 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 840 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { |
| 841 | /* Exception. Bailout! */ |
| 842 | len = -EFAULT; |
| 843 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 844 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 845 | found_fin_ok: |
| 846 | if (!(flags & MSG_PEEK)) |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 847 | sk_eat_skb(sk, skb, 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 848 | break; |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 849 | } while (1); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 850 | out: |
| 851 | release_sock(sk); |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 852 | return len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 853 | } |
| 854 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 855 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
| 856 | |
| 857 | int inet_dccp_listen(struct socket *sock, int backlog) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 858 | { |
| 859 | struct sock *sk = sock->sk; |
| 860 | unsigned char old_state; |
| 861 | int err; |
| 862 | |
| 863 | lock_sock(sk); |
| 864 | |
| 865 | err = -EINVAL; |
| 866 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) |
| 867 | goto out; |
| 868 | |
| 869 | old_state = sk->sk_state; |
| 870 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) |
| 871 | goto out; |
| 872 | |
| 873 | /* Really, if the socket is already in listen state |
| 874 | * we can only allow the backlog to be adjusted. |
| 875 | */ |
| 876 | if (old_state != DCCP_LISTEN) { |
| 877 | /* |
| 878 | * FIXME: here it probably should be sk->sk_prot->listen_start |
| 879 | * see tcp_listen_start |
| 880 | */ |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 881 | err = dccp_listen_start(sk, backlog); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 882 | if (err) |
| 883 | goto out; |
| 884 | } |
| 885 | sk->sk_max_ack_backlog = backlog; |
| 886 | err = 0; |
| 887 | |
| 888 | out: |
| 889 | release_sock(sk); |
| 890 | return err; |
| 891 | } |
| 892 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 893 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
| 894 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 895 | static void dccp_terminate_connection(struct sock *sk) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 896 | { |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 897 | u8 next_state = DCCP_CLOSED; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 898 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 899 | switch (sk->sk_state) { |
| 900 | case DCCP_PASSIVE_CLOSE: |
| 901 | case DCCP_PASSIVE_CLOSEREQ: |
| 902 | dccp_finish_passive_close(sk); |
| 903 | break; |
| 904 | case DCCP_PARTOPEN: |
| 905 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); |
| 906 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); |
| 907 | /* fall through */ |
| 908 | case DCCP_OPEN: |
| 909 | dccp_send_close(sk, 1); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 910 | |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 911 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
| 912 | !dccp_sk(sk)->dccps_server_timewait) |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 913 | next_state = DCCP_ACTIVE_CLOSEREQ; |
| 914 | else |
| 915 | next_state = DCCP_CLOSING; |
| 916 | /* fall through */ |
| 917 | default: |
| 918 | dccp_set_state(sk, next_state); |
| 919 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | void dccp_close(struct sock *sk, long timeout) |
| 923 | { |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 924 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 925 | struct sk_buff *skb; |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 926 | u32 data_was_unread = 0; |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 927 | int state; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 928 | |
| 929 | lock_sock(sk); |
| 930 | |
| 931 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 932 | |
| 933 | if (sk->sk_state == DCCP_LISTEN) { |
| 934 | dccp_set_state(sk, DCCP_CLOSED); |
| 935 | |
| 936 | /* Special case. */ |
| 937 | inet_csk_listen_stop(sk); |
| 938 | |
| 939 | goto adjudge_to_death; |
| 940 | } |
| 941 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 942 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
| 943 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 944 | /* |
| 945 | * We need to flush the recv. buffs. We do this only on the |
| 946 | * descriptor close, not protocol-sourced closes, because the |
| 947 | *reader process may not have drained the data yet! |
| 948 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 949 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 950 | data_was_unread += skb->len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 951 | __kfree_skb(skb); |
| 952 | } |
| 953 | |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 954 | if (data_was_unread) { |
| 955 | /* Unread data was tossed, send an appropriate Reset Code */ |
| 956 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); |
| 957 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 958 | dccp_set_state(sk, DCCP_CLOSED); |
| 959 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 960 | /* Check zero linger _after_ checking for unread data. */ |
| 961 | sk->sk_prot->disconnect(sk, 0); |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 962 | } else if (sk->sk_state != DCCP_CLOSED) { |
| 963 | dccp_terminate_connection(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 964 | } |
| 965 | |
| 966 | sk_stream_wait_close(sk, timeout); |
| 967 | |
| 968 | adjudge_to_death: |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 969 | state = sk->sk_state; |
| 970 | sock_hold(sk); |
| 971 | sock_orphan(sk); |
| 972 | atomic_inc(sk->sk_prot->orphan_count); |
| 973 | |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 974 | /* |
| 975 | * It is the last release_sock in its life. It will remove backlog. |
| 976 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 977 | release_sock(sk); |
| 978 | /* |
| 979 | * Now socket is owned by kernel and we acquire BH lock |
| 980 | * to finish close. No need to check for user refs. |
| 981 | */ |
| 982 | local_bh_disable(); |
| 983 | bh_lock_sock(sk); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 984 | WARN_ON(sock_owned_by_user(sk)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 985 | |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 986 | /* Have we already been destroyed by a softirq or backlog? */ |
| 987 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) |
| 988 | goto out; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 989 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 990 | if (sk->sk_state == DCCP_CLOSED) |
| 991 | inet_csk_destroy_sock(sk); |
| 992 | |
| 993 | /* Otherwise, socket is reprieved until protocol close. */ |
| 994 | |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 995 | out: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 996 | bh_unlock_sock(sk); |
| 997 | local_bh_enable(); |
| 998 | sock_put(sk); |
| 999 | } |
| 1000 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 1001 | EXPORT_SYMBOL_GPL(dccp_close); |
| 1002 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1003 | void dccp_shutdown(struct sock *sk, int how) |
| 1004 | { |
Gerrit Renker | 8e8c71f | 2007-11-21 09:56:48 -0200 | [diff] [blame] | 1005 | dccp_pr_debug("called shutdown(%x)\n", how); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 1008 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
| 1009 | |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1010 | static inline int dccp_mib_init(void) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1011 | { |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1012 | return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1013 | } |
| 1014 | |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1015 | static inline void dccp_mib_exit(void) |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1016 | { |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1017 | snmp_mib_free((void**)dccp_statistics); |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1018 | } |
| 1019 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1020 | static int thash_entries; |
| 1021 | module_param(thash_entries, int, 0444); |
| 1022 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); |
| 1023 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 1024 | #ifdef CONFIG_IP_DCCP_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1025 | int dccp_debug; |
Gerrit Renker | 042d18f | 2007-10-04 14:39:53 -0700 | [diff] [blame] | 1026 | module_param(dccp_debug, bool, 0444); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1027 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 1028 | |
| 1029 | EXPORT_SYMBOL_GPL(dccp_debug); |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 1030 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1031 | |
| 1032 | static int __init dccp_init(void) |
| 1033 | { |
| 1034 | unsigned long goal; |
| 1035 | int ehash_order, bhash_order, i; |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1036 | int rc = -ENOBUFS; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1037 | |
Patrick McHardy | 028b027 | 2008-04-12 18:35:41 -0700 | [diff] [blame] | 1038 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
| 1039 | FIELD_SIZEOF(struct sk_buff, cb)); |
| 1040 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1041 | dccp_hashinfo.bind_bucket_cachep = |
| 1042 | kmem_cache_create("dccp_bind_bucket", |
| 1043 | sizeof(struct inet_bind_bucket), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1044 | SLAB_HWCACHE_ALIGN, NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1045 | if (!dccp_hashinfo.bind_bucket_cachep) |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1046 | goto out; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1047 | |
| 1048 | /* |
| 1049 | * Size and allocate the main established and bind bucket |
| 1050 | * hash tables. |
| 1051 | * |
| 1052 | * The methodology is similar to that of the buffer cache. |
| 1053 | */ |
| 1054 | if (num_physpages >= (128 * 1024)) |
| 1055 | goal = num_physpages >> (21 - PAGE_SHIFT); |
| 1056 | else |
| 1057 | goal = num_physpages >> (23 - PAGE_SHIFT); |
| 1058 | |
| 1059 | if (thash_entries) |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1060 | goal = (thash_entries * |
| 1061 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1062 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
| 1063 | ; |
| 1064 | do { |
| 1065 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / |
| 1066 | sizeof(struct inet_ehash_bucket); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1067 | while (dccp_hashinfo.ehash_size & |
| 1068 | (dccp_hashinfo.ehash_size - 1)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1069 | dccp_hashinfo.ehash_size--; |
| 1070 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) |
| 1071 | __get_free_pages(GFP_ATOMIC, ehash_order); |
| 1072 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); |
| 1073 | |
| 1074 | if (!dccp_hashinfo.ehash) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1075 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1076 | goto out_free_bind_bucket_cachep; |
| 1077 | } |
| 1078 | |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 1079 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1080 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 1081 | INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1082 | } |
| 1083 | |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1084 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
| 1085 | goto out_free_dccp_ehash; |
| 1086 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1087 | bhash_order = ehash_order; |
| 1088 | |
| 1089 | do { |
| 1090 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / |
| 1091 | sizeof(struct inet_bind_hashbucket); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1092 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
| 1093 | bhash_order > 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1094 | continue; |
| 1095 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) |
| 1096 | __get_free_pages(GFP_ATOMIC, bhash_order); |
| 1097 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); |
| 1098 | |
| 1099 | if (!dccp_hashinfo.bhash) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1100 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1101 | goto out_free_dccp_locks; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1102 | } |
| 1103 | |
| 1104 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { |
| 1105 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); |
| 1106 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); |
| 1107 | } |
| 1108 | |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1109 | rc = dccp_mib_init(); |
Arnaldo Carvalho de Melo | fa23e2e | 2006-03-20 17:16:01 -0800 | [diff] [blame] | 1110 | if (rc) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1111 | goto out_free_dccp_bhash; |
| 1112 | |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1113 | rc = dccp_ackvec_init(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1114 | if (rc) |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1115 | goto out_free_dccp_mib; |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1116 | |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 1117 | rc = dccp_sysctl_init(); |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1118 | if (rc) |
| 1119 | goto out_ackvec_exit; |
Gerrit Renker | 4c70f38 | 2007-09-25 22:40:13 -0700 | [diff] [blame] | 1120 | |
| 1121 | dccp_timestamping_init(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1122 | out: |
| 1123 | return rc; |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1124 | out_ackvec_exit: |
| 1125 | dccp_ackvec_exit(); |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1126 | out_free_dccp_mib: |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1127 | dccp_mib_exit(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1128 | out_free_dccp_bhash: |
| 1129 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); |
| 1130 | dccp_hashinfo.bhash = NULL; |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1131 | out_free_dccp_locks: |
| 1132 | inet_ehash_locks_free(&dccp_hashinfo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1133 | out_free_dccp_ehash: |
| 1134 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); |
| 1135 | dccp_hashinfo.ehash = NULL; |
| 1136 | out_free_bind_bucket_cachep: |
| 1137 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
| 1138 | dccp_hashinfo.bind_bucket_cachep = NULL; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1139 | goto out; |
| 1140 | } |
| 1141 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1142 | static void __exit dccp_fini(void) |
| 1143 | { |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1144 | dccp_mib_exit(); |
Arnaldo Carvalho de Melo | 725ba8e | 2005-08-13 20:35:39 -0300 | [diff] [blame] | 1145 | free_pages((unsigned long)dccp_hashinfo.bhash, |
| 1146 | get_order(dccp_hashinfo.bhash_size * |
| 1147 | sizeof(struct inet_bind_hashbucket))); |
| 1148 | free_pages((unsigned long)dccp_hashinfo.ehash, |
| 1149 | get_order(dccp_hashinfo.ehash_size * |
| 1150 | sizeof(struct inet_ehash_bucket))); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1151 | inet_ehash_locks_free(&dccp_hashinfo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1152 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1153 | dccp_ackvec_exit(); |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 1154 | dccp_sysctl_exit(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1155 | } |
| 1156 | |
| 1157 | module_init(dccp_init); |
| 1158 | module_exit(dccp_fini); |
| 1159 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1160 | MODULE_LICENSE("GPL"); |
| 1161 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); |
| 1162 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |