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 | |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 43 | struct percpu_counter dccp_orphan_count; |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 44 | EXPORT_SYMBOL_GPL(dccp_orphan_count); |
| 45 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 46 | struct inet_hashinfo dccp_hashinfo; |
Arnaldo Carvalho de Melo | 075ae86 | 2006-03-20 21:24:19 -0800 | [diff] [blame] | 47 | EXPORT_SYMBOL_GPL(dccp_hashinfo); |
| 48 | |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 49 | /* the maximum queue length for tx in packets. 0 is no limit */ |
| 50 | int sysctl_dccp_tx_qlen __read_mostly = 5; |
| 51 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 52 | void dccp_set_state(struct sock *sk, const int state) |
| 53 | { |
| 54 | const int oldstate = sk->sk_state; |
| 55 | |
Gerrit Renker | f11135a | 2007-11-28 11:34:53 -0200 | [diff] [blame] | 56 | 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] | 57 | dccp_state_name(oldstate), dccp_state_name(state)); |
| 58 | WARN_ON(state == oldstate); |
| 59 | |
| 60 | switch (state) { |
| 61 | case DCCP_OPEN: |
| 62 | if (oldstate != DCCP_OPEN) |
| 63 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); |
Gerrit Renker | 6eb55d1 | 2008-12-08 01:15:26 -0800 | [diff] [blame] | 64 | /* Client retransmits all Confirm options until entering OPEN */ |
| 65 | if (oldstate == DCCP_PARTOPEN) |
| 66 | dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg); |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 67 | break; |
| 68 | |
| 69 | case DCCP_CLOSED: |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 70 | if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ || |
| 71 | oldstate == DCCP_CLOSING) |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 72 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); |
| 73 | |
| 74 | sk->sk_prot->unhash(sk); |
| 75 | if (inet_csk(sk)->icsk_bind_hash != NULL && |
| 76 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 77 | inet_put_port(sk); |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 78 | /* fall through */ |
| 79 | default: |
| 80 | if (oldstate == DCCP_OPEN) |
| 81 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); |
| 82 | } |
| 83 | |
| 84 | /* Change state AFTER socket is unhashed to avoid closed |
| 85 | * socket sitting in hash tables. |
| 86 | */ |
| 87 | sk->sk_state = state; |
| 88 | } |
| 89 | |
| 90 | EXPORT_SYMBOL_GPL(dccp_set_state); |
| 91 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 92 | static void dccp_finish_passive_close(struct sock *sk) |
| 93 | { |
| 94 | switch (sk->sk_state) { |
| 95 | case DCCP_PASSIVE_CLOSE: |
| 96 | /* Node (client or server) has received Close packet. */ |
| 97 | dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED); |
| 98 | dccp_set_state(sk, DCCP_CLOSED); |
| 99 | break; |
| 100 | case DCCP_PASSIVE_CLOSEREQ: |
| 101 | /* |
| 102 | * Client received CloseReq. We set the `active' flag so that |
| 103 | * dccp_send_close() retransmits the Close as per RFC 4340, 8.3. |
| 104 | */ |
| 105 | dccp_send_close(sk, 1); |
| 106 | dccp_set_state(sk, DCCP_CLOSING); |
| 107 | } |
| 108 | } |
| 109 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 110 | void dccp_done(struct sock *sk) |
| 111 | { |
| 112 | dccp_set_state(sk, DCCP_CLOSED); |
| 113 | dccp_clear_xmit_timers(sk); |
| 114 | |
| 115 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 116 | |
| 117 | if (!sock_flag(sk, SOCK_DEAD)) |
| 118 | sk->sk_state_change(sk); |
| 119 | else |
| 120 | inet_csk_destroy_sock(sk); |
| 121 | } |
| 122 | |
| 123 | EXPORT_SYMBOL_GPL(dccp_done); |
| 124 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 125 | const char *dccp_packet_name(const int type) |
| 126 | { |
| 127 | static const char *dccp_packet_names[] = { |
| 128 | [DCCP_PKT_REQUEST] = "REQUEST", |
| 129 | [DCCP_PKT_RESPONSE] = "RESPONSE", |
| 130 | [DCCP_PKT_DATA] = "DATA", |
| 131 | [DCCP_PKT_ACK] = "ACK", |
| 132 | [DCCP_PKT_DATAACK] = "DATAACK", |
| 133 | [DCCP_PKT_CLOSEREQ] = "CLOSEREQ", |
| 134 | [DCCP_PKT_CLOSE] = "CLOSE", |
| 135 | [DCCP_PKT_RESET] = "RESET", |
| 136 | [DCCP_PKT_SYNC] = "SYNC", |
| 137 | [DCCP_PKT_SYNCACK] = "SYNCACK", |
| 138 | }; |
| 139 | |
| 140 | if (type >= DCCP_NR_PKT_TYPES) |
| 141 | return "INVALID"; |
| 142 | else |
| 143 | return dccp_packet_names[type]; |
| 144 | } |
| 145 | |
| 146 | EXPORT_SYMBOL_GPL(dccp_packet_name); |
| 147 | |
| 148 | const char *dccp_state_name(const int state) |
| 149 | { |
| 150 | static char *dccp_state_names[] = { |
Gerrit Renker | f11135a | 2007-11-28 11:34:53 -0200 | [diff] [blame] | 151 | [DCCP_OPEN] = "OPEN", |
| 152 | [DCCP_REQUESTING] = "REQUESTING", |
| 153 | [DCCP_PARTOPEN] = "PARTOPEN", |
| 154 | [DCCP_LISTEN] = "LISTEN", |
| 155 | [DCCP_RESPOND] = "RESPOND", |
| 156 | [DCCP_CLOSING] = "CLOSING", |
| 157 | [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ", |
| 158 | [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE", |
| 159 | [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ", |
| 160 | [DCCP_TIME_WAIT] = "TIME_WAIT", |
| 161 | [DCCP_CLOSED] = "CLOSED", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 162 | }; |
| 163 | |
| 164 | if (state >= DCCP_MAX_STATES) |
| 165 | return "INVALID STATE!"; |
| 166 | else |
| 167 | return dccp_state_names[state]; |
| 168 | } |
| 169 | |
| 170 | EXPORT_SYMBOL_GPL(dccp_state_name); |
| 171 | |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 172 | 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] | 173 | { |
| 174 | struct dccp_sock *dp = dccp_sk(sk); |
| 175 | struct inet_connection_sock *icsk = inet_csk(sk); |
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; |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 182 | dp->dccps_mss_cache = 536; |
Arnaldo Carvalho de Melo | e18d7a9 | 2007-11-24 21:42:53 -0200 | [diff] [blame] | 183 | dp->dccps_rate_last = jiffies; |
| 184 | dp->dccps_role = DCCP_ROLE_UNDEFINED; |
| 185 | dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT; |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 186 | dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1; |
Arnaldo Carvalho de Melo | e18d7a9 | 2007-11-24 21:42:53 -0200 | [diff] [blame] | 187 | |
| 188 | dccp_init_xmit_timers(sk); |
| 189 | |
Gerrit Renker | ac75773 | 2008-11-04 23:55:49 -0800 | [diff] [blame] | 190 | INIT_LIST_HEAD(&dp->dccps_featneg); |
Gerrit Renker | 6eb55d1 | 2008-12-08 01:15:26 -0800 | [diff] [blame] | 191 | /* control socket doesn't need feat nego */ |
| 192 | if (likely(ctl_sock_initialized)) |
| 193 | return dccp_feat_init(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | EXPORT_SYMBOL_GPL(dccp_init_sock); |
| 198 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 199 | void dccp_destroy_sock(struct sock *sk) |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 200 | { |
| 201 | struct dccp_sock *dp = dccp_sk(sk); |
| 202 | |
| 203 | /* |
| 204 | * DCCP doesn't use sk_write_queue, just sk_send_head |
| 205 | * for retransmissions |
| 206 | */ |
| 207 | if (sk->sk_send_head != NULL) { |
| 208 | kfree_skb(sk->sk_send_head); |
| 209 | sk->sk_send_head = NULL; |
| 210 | } |
| 211 | |
| 212 | /* Clean up a referenced DCCP bind bucket. */ |
| 213 | if (inet_csk(sk)->icsk_bind_hash != NULL) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 214 | inet_put_port(sk); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 215 | |
| 216 | kfree(dp->dccps_service_list); |
| 217 | dp->dccps_service_list = NULL; |
| 218 | |
Gerrit Renker | 6fdd34d | 2008-12-08 01:19:06 -0800 | [diff] [blame] | 219 | if (dp->dccps_hc_rx_ackvec != NULL) { |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 220 | dccp_ackvec_free(dp->dccps_hc_rx_ackvec); |
| 221 | dp->dccps_hc_rx_ackvec = NULL; |
| 222 | } |
| 223 | ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); |
| 224 | ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); |
| 225 | dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL; |
| 226 | |
| 227 | /* clean up feature negotiation state */ |
Gerrit Renker | d99a7bd | 2008-11-04 23:56:30 -0800 | [diff] [blame] | 228 | dccp_feat_list_purge(&dp->dccps_featneg); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | EXPORT_SYMBOL_GPL(dccp_destroy_sock); |
| 232 | |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 233 | 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] | 234 | { |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 235 | struct dccp_sock *dp = dccp_sk(sk); |
| 236 | |
| 237 | dp->dccps_role = DCCP_ROLE_LISTEN; |
Gerrit Renker | 9eca0a4 | 2008-11-12 00:48:44 -0800 | [diff] [blame] | 238 | /* do not start to listen if feature negotiation setup fails */ |
| 239 | if (dccp_feat_finalise_settings(dp)) |
| 240 | return -EPROTO; |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 241 | return inet_csk_listen_start(sk, backlog); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 242 | } |
| 243 | |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame] | 244 | static inline int dccp_need_reset(int state) |
| 245 | { |
| 246 | return state != DCCP_CLOSED && state != DCCP_LISTEN && |
| 247 | state != DCCP_REQUESTING; |
| 248 | } |
| 249 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 250 | int dccp_disconnect(struct sock *sk, int flags) |
| 251 | { |
| 252 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 253 | struct inet_sock *inet = inet_sk(sk); |
| 254 | int err = 0; |
| 255 | const int old_state = sk->sk_state; |
| 256 | |
| 257 | if (old_state != DCCP_CLOSED) |
| 258 | dccp_set_state(sk, DCCP_CLOSED); |
| 259 | |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame] | 260 | /* |
| 261 | * This corresponds to the ABORT function of RFC793, sec. 3.8 |
| 262 | * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted". |
| 263 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 264 | if (old_state == DCCP_LISTEN) { |
| 265 | inet_csk_listen_stop(sk); |
Gerrit Renker | ce865a6 | 2007-11-24 22:14:15 -0200 | [diff] [blame] | 266 | } else if (dccp_need_reset(old_state)) { |
| 267 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 268 | sk->sk_err = ECONNRESET; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 269 | } else if (old_state == DCCP_REQUESTING) |
| 270 | sk->sk_err = ECONNRESET; |
| 271 | |
| 272 | dccp_clear_xmit_timers(sk); |
Gerrit Renker | 4881632 | 2008-08-23 13:28:27 +0200 | [diff] [blame] | 273 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 274 | __skb_queue_purge(&sk->sk_receive_queue); |
Gerrit Renker | 4881632 | 2008-08-23 13:28:27 +0200 | [diff] [blame] | 275 | __skb_queue_purge(&sk->sk_write_queue); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 276 | if (sk->sk_send_head != NULL) { |
| 277 | __kfree_skb(sk->sk_send_head); |
| 278 | sk->sk_send_head = NULL; |
| 279 | } |
| 280 | |
| 281 | inet->dport = 0; |
| 282 | |
| 283 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 284 | inet_reset_saddr(sk); |
| 285 | |
| 286 | sk->sk_shutdown = 0; |
| 287 | sock_reset_flag(sk, SOCK_DONE); |
| 288 | |
| 289 | icsk->icsk_backoff = 0; |
| 290 | inet_csk_delack_init(sk); |
| 291 | __sk_dst_reset(sk); |
| 292 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 293 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 294 | |
| 295 | sk->sk_error_report(sk); |
| 296 | return err; |
| 297 | } |
| 298 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 299 | EXPORT_SYMBOL_GPL(dccp_disconnect); |
| 300 | |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 301 | /* |
| 302 | * Wait for a DCCP event. |
| 303 | * |
| 304 | * Note that we don't need to lock the socket, as the upper poll layers |
| 305 | * take care of normal races (between the test and the event) and we don't |
| 306 | * go look at any of the socket buffers directly. |
| 307 | */ |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 308 | unsigned int dccp_poll(struct file *file, struct socket *sock, |
| 309 | poll_table *wait) |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 310 | { |
| 311 | unsigned int mask; |
| 312 | struct sock *sk = sock->sk; |
| 313 | |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 314 | sock_poll_wait(file, sk->sk_sleep, wait); |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 315 | if (sk->sk_state == DCCP_LISTEN) |
| 316 | return inet_csk_listen_poll(sk); |
| 317 | |
| 318 | /* Socket is not locked. We are protected from async events |
| 319 | by poll logic and correct handling of state changes |
| 320 | made by another threads is impossible in any case. |
| 321 | */ |
| 322 | |
| 323 | mask = 0; |
| 324 | if (sk->sk_err) |
| 325 | mask = POLLERR; |
| 326 | |
| 327 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED) |
| 328 | mask |= POLLHUP; |
| 329 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 330 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
Arnaldo Carvalho de Melo | 331968b | 2005-08-23 21:54:23 -0700 | [diff] [blame] | 331 | |
| 332 | /* Connected? */ |
| 333 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) { |
| 334 | if (atomic_read(&sk->sk_rmem_alloc) > 0) |
| 335 | mask |= POLLIN | POLLRDNORM; |
| 336 | |
| 337 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 338 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
| 339 | mask |= POLLOUT | POLLWRNORM; |
| 340 | } else { /* send SIGIO later */ |
| 341 | set_bit(SOCK_ASYNC_NOSPACE, |
| 342 | &sk->sk_socket->flags); |
| 343 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 344 | |
| 345 | /* Race breaker. If space is freed after |
| 346 | * wspace test but before the flags are set, |
| 347 | * IO signal will be lost. |
| 348 | */ |
| 349 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
| 350 | mask |= POLLOUT | POLLWRNORM; |
| 351 | } |
| 352 | } |
| 353 | } |
| 354 | return mask; |
| 355 | } |
| 356 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 357 | EXPORT_SYMBOL_GPL(dccp_poll); |
| 358 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 359 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 360 | { |
Arnaldo Carvalho de Melo | 6273172 | 2007-10-23 20:23:30 -0700 | [diff] [blame] | 361 | int rc = -ENOTCONN; |
| 362 | |
| 363 | lock_sock(sk); |
| 364 | |
| 365 | if (sk->sk_state == DCCP_LISTEN) |
| 366 | goto out; |
| 367 | |
| 368 | switch (cmd) { |
| 369 | case SIOCINQ: { |
| 370 | struct sk_buff *skb; |
| 371 | unsigned long amount = 0; |
| 372 | |
| 373 | skb = skb_peek(&sk->sk_receive_queue); |
| 374 | if (skb != NULL) { |
| 375 | /* |
| 376 | * We will only return the amount of this packet since |
| 377 | * that is all that will be read. |
| 378 | */ |
| 379 | amount = skb->len; |
| 380 | } |
| 381 | rc = put_user(amount, (int __user *)arg); |
| 382 | } |
| 383 | break; |
| 384 | default: |
| 385 | rc = -ENOIOCTLCMD; |
| 386 | break; |
| 387 | } |
| 388 | out: |
| 389 | release_sock(sk); |
| 390 | return rc; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 391 | } |
| 392 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 393 | EXPORT_SYMBOL_GPL(dccp_ioctl); |
| 394 | |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 395 | 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] | 396 | char __user *optval, int optlen) |
| 397 | { |
| 398 | struct dccp_sock *dp = dccp_sk(sk); |
| 399 | struct dccp_service_list *sl = NULL; |
| 400 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 401 | if (service == DCCP_SERVICE_INVALID_VALUE || |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 402 | optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32)) |
| 403 | return -EINVAL; |
| 404 | |
| 405 | if (optlen > sizeof(service)) { |
| 406 | sl = kmalloc(optlen, GFP_KERNEL); |
| 407 | if (sl == NULL) |
| 408 | return -ENOMEM; |
| 409 | |
| 410 | sl->dccpsl_nr = optlen / sizeof(u32) - 1; |
| 411 | if (copy_from_user(sl->dccpsl_list, |
| 412 | optval + sizeof(service), |
| 413 | optlen - sizeof(service)) || |
| 414 | dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) { |
| 415 | kfree(sl); |
| 416 | return -EFAULT; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | lock_sock(sk); |
| 421 | dp->dccps_service = service; |
| 422 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 423 | kfree(dp->dccps_service_list); |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 424 | |
| 425 | dp->dccps_service_list = sl; |
| 426 | release_sock(sk); |
| 427 | return 0; |
| 428 | } |
| 429 | |
Gerrit Renker | 2945055 | 2008-11-16 22:53:48 -0800 | [diff] [blame] | 430 | static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx) |
| 431 | { |
| 432 | u8 *list, len; |
| 433 | int i, rc; |
| 434 | |
| 435 | if (cscov < 0 || cscov > 15) |
| 436 | return -EINVAL; |
| 437 | /* |
| 438 | * Populate a list of permissible values, in the range cscov...15. This |
| 439 | * is necessary since feature negotiation of single values only works if |
| 440 | * both sides incidentally choose the same value. Since the list starts |
| 441 | * lowest-value first, negotiation will pick the smallest shared value. |
| 442 | */ |
| 443 | if (cscov == 0) |
| 444 | return 0; |
| 445 | len = 16 - cscov; |
| 446 | |
| 447 | list = kmalloc(len, GFP_KERNEL); |
| 448 | if (list == NULL) |
| 449 | return -ENOBUFS; |
| 450 | |
| 451 | for (i = 0; i < len; i++) |
| 452 | list[i] = cscov++; |
| 453 | |
| 454 | rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len); |
| 455 | |
| 456 | if (rc == 0) { |
| 457 | if (rx) |
| 458 | dccp_sk(sk)->dccps_pcrlen = cscov; |
| 459 | else |
| 460 | dccp_sk(sk)->dccps_pcslen = cscov; |
| 461 | } |
| 462 | kfree(list); |
| 463 | return rc; |
| 464 | } |
| 465 | |
Gerrit Renker | b20a9c2 | 2008-11-23 16:02:31 -0800 | [diff] [blame] | 466 | static int dccp_setsockopt_ccid(struct sock *sk, int type, |
| 467 | char __user *optval, int optlen) |
| 468 | { |
| 469 | u8 *val; |
| 470 | int rc = 0; |
| 471 | |
| 472 | if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS) |
| 473 | return -EINVAL; |
| 474 | |
| 475 | val = kmalloc(optlen, GFP_KERNEL); |
| 476 | if (val == NULL) |
| 477 | return -ENOMEM; |
| 478 | |
| 479 | if (copy_from_user(val, optval, optlen)) { |
| 480 | kfree(val); |
| 481 | return -EFAULT; |
| 482 | } |
| 483 | |
| 484 | lock_sock(sk); |
| 485 | if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID) |
| 486 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen); |
| 487 | |
| 488 | if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID)) |
| 489 | rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen); |
| 490 | release_sock(sk); |
| 491 | |
| 492 | kfree(val); |
| 493 | return rc; |
| 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 | |
Gerrit Renker | 1910299 | 2008-11-16 22:56:55 -0800 | [diff] [blame] | 502 | switch (optname) { |
| 503 | case DCCP_SOCKOPT_PACKET_SIZE: |
| 504 | DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n"); |
| 505 | return 0; |
| 506 | case DCCP_SOCKOPT_CHANGE_L: |
| 507 | case DCCP_SOCKOPT_CHANGE_R: |
| 508 | DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n"); |
| 509 | return 0; |
Gerrit Renker | b20a9c2 | 2008-11-23 16:02:31 -0800 | [diff] [blame] | 510 | case DCCP_SOCKOPT_CCID: |
| 511 | case DCCP_SOCKOPT_RX_CCID: |
| 512 | case DCCP_SOCKOPT_TX_CCID: |
| 513 | return dccp_setsockopt_ccid(sk, optname, optval, optlen); |
Gerrit Renker | 1910299 | 2008-11-16 22:56:55 -0800 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | if (optlen < (int)sizeof(int)) |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 517 | return -EINVAL; |
| 518 | |
| 519 | if (get_user(val, (int __user *)optval)) |
| 520 | return -EFAULT; |
| 521 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 522 | if (optname == DCCP_SOCKOPT_SERVICE) |
| 523 | return dccp_setsockopt_service(sk, val, optval, optlen); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 524 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 525 | lock_sock(sk); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 526 | switch (optname) { |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 527 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
| 528 | if (dp->dccps_role != DCCP_ROLE_SERVER) |
| 529 | err = -EOPNOTSUPP; |
| 530 | else |
| 531 | dp->dccps_server_timewait = (val != 0); |
| 532 | break; |
Gerrit Renker | 2945055 | 2008-11-16 22:53:48 -0800 | [diff] [blame] | 533 | case DCCP_SOCKOPT_SEND_CSCOV: |
| 534 | err = dccp_setsockopt_cscov(sk, val, false); |
Tomasz Grobelny | d6da351 | 2008-09-04 07:30:19 +0200 | [diff] [blame] | 535 | break; |
Gerrit Renker | 2945055 | 2008-11-16 22:53:48 -0800 | [diff] [blame] | 536 | case DCCP_SOCKOPT_RECV_CSCOV: |
| 537 | err = dccp_setsockopt_cscov(sk, val, true); |
Tomasz Grobelny | d6da351 | 2008-09-04 07:30:19 +0200 | [diff] [blame] | 538 | break; |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 539 | default: |
| 540 | err = -ENOPROTOOPT; |
| 541 | break; |
| 542 | } |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 543 | release_sock(sk); |
Gerrit Renker | 1910299 | 2008-11-16 22:56:55 -0800 | [diff] [blame] | 544 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 545 | return err; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 546 | } |
| 547 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 548 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
| 549 | char __user *optval, int optlen) |
| 550 | { |
| 551 | if (level != SOL_DCCP) |
| 552 | return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level, |
| 553 | optname, optval, |
| 554 | optlen); |
| 555 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 556 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 557 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 558 | EXPORT_SYMBOL_GPL(dccp_setsockopt); |
| 559 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 560 | #ifdef CONFIG_COMPAT |
| 561 | 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] | 562 | char __user *optval, int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 563 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 564 | if (level != SOL_DCCP) |
| 565 | return inet_csk_compat_setsockopt(sk, level, optname, |
| 566 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 567 | return do_dccp_setsockopt(sk, level, optname, optval, optlen); |
| 568 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 569 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 570 | EXPORT_SYMBOL_GPL(compat_dccp_setsockopt); |
| 571 | #endif |
| 572 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 573 | static int dccp_getsockopt_service(struct sock *sk, int len, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 574 | __be32 __user *optval, |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 575 | int __user *optlen) |
| 576 | { |
| 577 | const struct dccp_sock *dp = dccp_sk(sk); |
| 578 | const struct dccp_service_list *sl; |
| 579 | int err = -ENOENT, slen = 0, total_len = sizeof(u32); |
| 580 | |
| 581 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 582 | if ((sl = dp->dccps_service_list) != NULL) { |
| 583 | slen = sl->dccpsl_nr * sizeof(u32); |
| 584 | total_len += slen; |
| 585 | } |
| 586 | |
| 587 | err = -EINVAL; |
| 588 | if (total_len > len) |
| 589 | goto out; |
| 590 | |
| 591 | err = 0; |
| 592 | if (put_user(total_len, optlen) || |
| 593 | put_user(dp->dccps_service, optval) || |
| 594 | (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen))) |
| 595 | err = -EFAULT; |
| 596 | out: |
| 597 | release_sock(sk); |
| 598 | return err; |
| 599 | } |
| 600 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 601 | 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] | 602 | char __user *optval, int __user *optlen) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 603 | { |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 604 | struct dccp_sock *dp; |
| 605 | int val, len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 606 | |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 607 | if (get_user(len, optlen)) |
| 608 | return -EFAULT; |
| 609 | |
Arnaldo Carvalho de Melo | 39ebc02 | 2007-03-28 11:54:32 -0700 | [diff] [blame] | 610 | if (len < (int)sizeof(int)) |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 611 | return -EINVAL; |
| 612 | |
| 613 | dp = dccp_sk(sk); |
| 614 | |
| 615 | switch (optname) { |
| 616 | case DCCP_SOCKOPT_PACKET_SIZE: |
Gerrit Renker | 5aed324 | 2006-11-28 19:33:36 -0200 | [diff] [blame] | 617 | 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] | 618 | return 0; |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 619 | case DCCP_SOCKOPT_SERVICE: |
| 620 | return dccp_getsockopt_service(sk, len, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 621 | (__be32 __user *)optval, optlen); |
Gerrit Renker | 7c559a9 | 2007-10-04 14:39:22 -0700 | [diff] [blame] | 622 | case DCCP_SOCKOPT_GET_CUR_MPS: |
| 623 | val = dp->dccps_mss_cache; |
Gerrit Renker | 7c559a9 | 2007-10-04 14:39:22 -0700 | [diff] [blame] | 624 | break; |
Gerrit Renker | d90ebcb | 2008-11-12 00:47:26 -0800 | [diff] [blame] | 625 | case DCCP_SOCKOPT_AVAILABLE_CCIDS: |
| 626 | return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen); |
Gerrit Renker | 71c262a | 2008-11-23 16:04:59 -0800 | [diff] [blame] | 627 | case DCCP_SOCKOPT_TX_CCID: |
| 628 | val = ccid_get_current_tx_ccid(dp); |
| 629 | if (val < 0) |
| 630 | return -ENOPROTOOPT; |
| 631 | break; |
| 632 | case DCCP_SOCKOPT_RX_CCID: |
| 633 | val = ccid_get_current_rx_ccid(dp); |
| 634 | if (val < 0) |
| 635 | return -ENOPROTOOPT; |
| 636 | break; |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 637 | case DCCP_SOCKOPT_SERVER_TIMEWAIT: |
| 638 | val = dp->dccps_server_timewait; |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 639 | break; |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 640 | case DCCP_SOCKOPT_SEND_CSCOV: |
| 641 | val = dp->dccps_pcslen; |
| 642 | break; |
| 643 | case DCCP_SOCKOPT_RECV_CSCOV: |
| 644 | val = dp->dccps_pcrlen; |
| 645 | break; |
Arnaldo Carvalho de Melo | 88f964d | 2005-09-18 00:19:32 -0700 | [diff] [blame] | 646 | case 128 ... 191: |
| 647 | return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname, |
| 648 | len, (u32 __user *)optval, optlen); |
| 649 | case 192 ... 255: |
| 650 | return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname, |
| 651 | len, (u32 __user *)optval, optlen); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 652 | default: |
| 653 | return -ENOPROTOOPT; |
| 654 | } |
| 655 | |
Gerrit Renker | 7913350 | 2007-12-13 12:27:14 -0200 | [diff] [blame] | 656 | len = sizeof(val); |
Arnaldo Carvalho de Melo | a84ffe4 | 2005-08-28 04:51:32 -0300 | [diff] [blame] | 657 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
| 658 | return -EFAULT; |
| 659 | |
| 660 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 661 | } |
| 662 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 663 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
| 664 | char __user *optval, int __user *optlen) |
| 665 | { |
| 666 | if (level != SOL_DCCP) |
| 667 | return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level, |
| 668 | optname, optval, |
| 669 | optlen); |
| 670 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 671 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 672 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 673 | EXPORT_SYMBOL_GPL(dccp_getsockopt); |
| 674 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 675 | #ifdef CONFIG_COMPAT |
| 676 | 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] | 677 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 678 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 679 | if (level != SOL_DCCP) |
| 680 | return inet_csk_compat_getsockopt(sk, level, optname, |
| 681 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 682 | return do_dccp_getsockopt(sk, level, optname, optval, optlen); |
| 683 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 684 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 685 | EXPORT_SYMBOL_GPL(compat_dccp_getsockopt); |
| 686 | #endif |
| 687 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 688 | int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 689 | size_t len) |
| 690 | { |
| 691 | const struct dccp_sock *dp = dccp_sk(sk); |
| 692 | const int flags = msg->msg_flags; |
| 693 | const int noblock = flags & MSG_DONTWAIT; |
| 694 | struct sk_buff *skb; |
| 695 | int rc, size; |
| 696 | long timeo; |
| 697 | |
| 698 | if (len > dp->dccps_mss_cache) |
| 699 | return -EMSGSIZE; |
| 700 | |
| 701 | lock_sock(sk); |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 702 | |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 703 | if (sysctl_dccp_tx_qlen && |
| 704 | (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) { |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 705 | rc = -EAGAIN; |
| 706 | goto out_release; |
| 707 | } |
| 708 | |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 709 | timeo = sock_sndtimeo(sk, noblock); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 710 | |
| 711 | /* |
| 712 | * We have to use sk_stream_wait_connect here to set sk_write_pending, |
| 713 | * so that the trick in dccp_rcv_request_sent_state_process. |
| 714 | */ |
| 715 | /* Wait for a connection to finish. */ |
Gerrit Renker | cecd8d0 | 2007-09-26 19:36:08 -0300 | [diff] [blame] | 716 | if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 717 | if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0) |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 718 | goto out_release; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 719 | |
| 720 | size = sk->sk_prot->max_header + len; |
| 721 | release_sock(sk); |
| 722 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
| 723 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 724 | if (skb == NULL) |
| 725 | goto out_release; |
| 726 | |
| 727 | skb_reserve(skb, sk->sk_prot->max_header); |
| 728 | 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] | 729 | if (rc != 0) |
| 730 | goto out_discard; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 731 | |
Gerrit Renker | 410e27a | 2008-09-09 13:27:22 +0200 | [diff] [blame] | 732 | skb_queue_tail(&sk->sk_write_queue, skb); |
| 733 | dccp_write_xmit(sk,0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 734 | out_release: |
| 735 | release_sock(sk); |
| 736 | return rc ? : len; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 737 | out_discard: |
| 738 | kfree_skb(skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 739 | goto out_release; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 740 | } |
| 741 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 742 | EXPORT_SYMBOL_GPL(dccp_sendmsg); |
| 743 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 744 | int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 745 | size_t len, int nonblock, int flags, int *addr_len) |
| 746 | { |
| 747 | const struct dccp_hdr *dh; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 748 | long timeo; |
| 749 | |
| 750 | lock_sock(sk); |
| 751 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 752 | if (sk->sk_state == DCCP_LISTEN) { |
| 753 | len = -ENOTCONN; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 754 | goto out; |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 755 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 756 | |
| 757 | timeo = sock_rcvtimeo(sk, nonblock); |
| 758 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 759 | do { |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 760 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 761 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 762 | if (skb == NULL) |
| 763 | goto verify_sock_status; |
| 764 | |
| 765 | dh = dccp_hdr(skb); |
| 766 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 767 | switch (dh->dccph_type) { |
| 768 | case DCCP_PKT_DATA: |
| 769 | case DCCP_PKT_DATAACK: |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 770 | goto found_ok_skb; |
| 771 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 772 | case DCCP_PKT_CLOSE: |
| 773 | case DCCP_PKT_CLOSEREQ: |
| 774 | if (!(flags & MSG_PEEK)) |
| 775 | dccp_finish_passive_close(sk); |
| 776 | /* fall through */ |
| 777 | case DCCP_PKT_RESET: |
| 778 | dccp_pr_debug("found fin (%s) ok!\n", |
| 779 | dccp_packet_name(dh->dccph_type)); |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 780 | len = 0; |
| 781 | goto found_fin_ok; |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 782 | default: |
| 783 | dccp_pr_debug("packet_type=%s\n", |
| 784 | dccp_packet_name(dh->dccph_type)); |
| 785 | sk_eat_skb(sk, skb, 0); |
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 | verify_sock_status: |
| 788 | if (sock_flag(sk, SOCK_DONE)) { |
| 789 | len = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 790 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 791 | } |
| 792 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 793 | if (sk->sk_err) { |
| 794 | len = sock_error(sk); |
| 795 | break; |
| 796 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 797 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 798 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
| 799 | len = 0; |
| 800 | break; |
| 801 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 802 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 803 | if (sk->sk_state == DCCP_CLOSED) { |
| 804 | if (!sock_flag(sk, SOCK_DONE)) { |
| 805 | /* This occurs when user tries to read |
| 806 | * from never connected socket. |
| 807 | */ |
| 808 | len = -ENOTCONN; |
| 809 | break; |
| 810 | } |
| 811 | len = 0; |
| 812 | break; |
| 813 | } |
| 814 | |
| 815 | if (!timeo) { |
| 816 | len = -EAGAIN; |
| 817 | break; |
| 818 | } |
| 819 | |
| 820 | if (signal_pending(current)) { |
| 821 | len = sock_intr_errno(timeo); |
| 822 | break; |
| 823 | } |
| 824 | |
| 825 | sk_wait_data(sk, &timeo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 826 | continue; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 827 | found_ok_skb: |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 828 | if (len > skb->len) |
| 829 | len = skb->len; |
| 830 | else if (len < skb->len) |
| 831 | msg->msg_flags |= MSG_TRUNC; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 832 | |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 833 | if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) { |
| 834 | /* Exception. Bailout! */ |
| 835 | len = -EFAULT; |
| 836 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 837 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 838 | found_fin_ok: |
| 839 | if (!(flags & MSG_PEEK)) |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 840 | sk_eat_skb(sk, skb, 0); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 841 | break; |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 842 | } while (1); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 843 | out: |
| 844 | release_sock(sk); |
Arnaldo Carvalho de Melo | 531669a | 2005-08-13 20:35:17 -0300 | [diff] [blame] | 845 | return len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 846 | } |
| 847 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 848 | EXPORT_SYMBOL_GPL(dccp_recvmsg); |
| 849 | |
| 850 | int inet_dccp_listen(struct socket *sock, int backlog) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 851 | { |
| 852 | struct sock *sk = sock->sk; |
| 853 | unsigned char old_state; |
| 854 | int err; |
| 855 | |
| 856 | lock_sock(sk); |
| 857 | |
| 858 | err = -EINVAL; |
| 859 | if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP) |
| 860 | goto out; |
| 861 | |
| 862 | old_state = sk->sk_state; |
| 863 | if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) |
| 864 | goto out; |
| 865 | |
| 866 | /* Really, if the socket is already in listen state |
| 867 | * we can only allow the backlog to be adjusted. |
| 868 | */ |
| 869 | if (old_state != DCCP_LISTEN) { |
| 870 | /* |
| 871 | * FIXME: here it probably should be sk->sk_prot->listen_start |
| 872 | * see tcp_listen_start |
| 873 | */ |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 874 | err = dccp_listen_start(sk, backlog); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 875 | if (err) |
| 876 | goto out; |
| 877 | } |
| 878 | sk->sk_max_ack_backlog = backlog; |
| 879 | err = 0; |
| 880 | |
| 881 | out: |
| 882 | release_sock(sk); |
| 883 | return err; |
| 884 | } |
| 885 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 886 | EXPORT_SYMBOL_GPL(inet_dccp_listen); |
| 887 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 888 | static void dccp_terminate_connection(struct sock *sk) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 889 | { |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 890 | u8 next_state = DCCP_CLOSED; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 891 | |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 892 | switch (sk->sk_state) { |
| 893 | case DCCP_PASSIVE_CLOSE: |
| 894 | case DCCP_PASSIVE_CLOSEREQ: |
| 895 | dccp_finish_passive_close(sk); |
| 896 | break; |
| 897 | case DCCP_PARTOPEN: |
| 898 | dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk); |
| 899 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); |
| 900 | /* fall through */ |
| 901 | case DCCP_OPEN: |
| 902 | dccp_send_close(sk, 1); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 903 | |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 904 | if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER && |
| 905 | !dccp_sk(sk)->dccps_server_timewait) |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 906 | next_state = DCCP_ACTIVE_CLOSEREQ; |
| 907 | else |
| 908 | next_state = DCCP_CLOSING; |
| 909 | /* fall through */ |
| 910 | default: |
| 911 | dccp_set_state(sk, next_state); |
| 912 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 913 | } |
| 914 | |
| 915 | void dccp_close(struct sock *sk, long timeout) |
| 916 | { |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 917 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 918 | struct sk_buff *skb; |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 919 | u32 data_was_unread = 0; |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 920 | int state; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 921 | |
| 922 | lock_sock(sk); |
| 923 | |
| 924 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 925 | |
| 926 | if (sk->sk_state == DCCP_LISTEN) { |
| 927 | dccp_set_state(sk, DCCP_CLOSED); |
| 928 | |
| 929 | /* Special case. */ |
| 930 | inet_csk_listen_stop(sk); |
| 931 | |
| 932 | goto adjudge_to_death; |
| 933 | } |
| 934 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 935 | sk_stop_timer(sk, &dp->dccps_xmit_timer); |
| 936 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 937 | /* |
| 938 | * We need to flush the recv. buffs. We do this only on the |
| 939 | * descriptor close, not protocol-sourced closes, because the |
| 940 | *reader process may not have drained the data yet! |
| 941 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 942 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 943 | data_was_unread += skb->len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 944 | __kfree_skb(skb); |
| 945 | } |
| 946 | |
Gerrit Renker | d83bd95 | 2007-12-16 16:06:03 -0800 | [diff] [blame] | 947 | if (data_was_unread) { |
| 948 | /* Unread data was tossed, send an appropriate Reset Code */ |
| 949 | DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread); |
| 950 | dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED); |
| 951 | dccp_set_state(sk, DCCP_CLOSED); |
| 952 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 953 | /* Check zero linger _after_ checking for unread data. */ |
| 954 | sk->sk_prot->disconnect(sk, 0); |
Gerrit Renker | 0c86962 | 2007-11-28 11:59:48 -0200 | [diff] [blame] | 955 | } else if (sk->sk_state != DCCP_CLOSED) { |
| 956 | dccp_terminate_connection(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | sk_stream_wait_close(sk, timeout); |
| 960 | |
| 961 | adjudge_to_death: |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 962 | state = sk->sk_state; |
| 963 | sock_hold(sk); |
| 964 | sock_orphan(sk); |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 965 | |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 966 | /* |
| 967 | * It is the last release_sock in its life. It will remove backlog. |
| 968 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 969 | release_sock(sk); |
| 970 | /* |
| 971 | * Now socket is owned by kernel and we acquire BH lock |
| 972 | * to finish close. No need to check for user refs. |
| 973 | */ |
| 974 | local_bh_disable(); |
| 975 | bh_lock_sock(sk); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 976 | WARN_ON(sock_owned_by_user(sk)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 977 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 978 | percpu_counter_inc(sk->sk_prot->orphan_count); |
| 979 | |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 980 | /* Have we already been destroyed by a softirq or backlog? */ |
| 981 | if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED) |
| 982 | goto out; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 983 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 984 | if (sk->sk_state == DCCP_CLOSED) |
| 985 | inet_csk_destroy_sock(sk); |
| 986 | |
| 987 | /* Otherwise, socket is reprieved until protocol close. */ |
| 988 | |
Herbert Xu | 134af34 | 2006-05-05 17:09:13 -0700 | [diff] [blame] | 989 | out: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 990 | bh_unlock_sock(sk); |
| 991 | local_bh_enable(); |
| 992 | sock_put(sk); |
| 993 | } |
| 994 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 995 | EXPORT_SYMBOL_GPL(dccp_close); |
| 996 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 997 | void dccp_shutdown(struct sock *sk, int how) |
| 998 | { |
Gerrit Renker | 8e8c71f | 2007-11-21 09:56:48 -0200 | [diff] [blame] | 999 | dccp_pr_debug("called shutdown(%x)\n", how); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1000 | } |
| 1001 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 1002 | EXPORT_SYMBOL_GPL(dccp_shutdown); |
| 1003 | |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1004 | static inline int dccp_mib_init(void) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1005 | { |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1006 | 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] | 1007 | } |
| 1008 | |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1009 | static inline void dccp_mib_exit(void) |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1010 | { |
YOSHIFUJI Hideaki | 24e8b7e | 2008-04-10 03:48:43 -0700 | [diff] [blame] | 1011 | snmp_mib_free((void**)dccp_statistics); |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1012 | } |
| 1013 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1014 | static int thash_entries; |
| 1015 | module_param(thash_entries, int, 0444); |
| 1016 | MODULE_PARM_DESC(thash_entries, "Number of ehash buckets"); |
| 1017 | |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 1018 | #ifdef CONFIG_IP_DCCP_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1019 | int dccp_debug; |
Gerrit Renker | 4326499 | 2008-08-23 13:28:27 +0200 | [diff] [blame] | 1020 | module_param(dccp_debug, bool, 0644); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1021 | MODULE_PARM_DESC(dccp_debug, "Enable debug messages"); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 1022 | |
| 1023 | EXPORT_SYMBOL_GPL(dccp_debug); |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 1024 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1025 | |
| 1026 | static int __init dccp_init(void) |
| 1027 | { |
| 1028 | unsigned long goal; |
| 1029 | int ehash_order, bhash_order, i; |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 1030 | int rc; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1031 | |
Patrick McHardy | 028b027 | 2008-04-12 18:35:41 -0700 | [diff] [blame] | 1032 | BUILD_BUG_ON(sizeof(struct dccp_skb_cb) > |
| 1033 | FIELD_SIZEOF(struct sk_buff, cb)); |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 1034 | rc = percpu_counter_init(&dccp_orphan_count, 0); |
| 1035 | if (rc) |
| 1036 | goto out; |
| 1037 | rc = -ENOBUFS; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 1038 | inet_hashinfo_init(&dccp_hashinfo); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1039 | dccp_hashinfo.bind_bucket_cachep = |
| 1040 | kmem_cache_create("dccp_bind_bucket", |
| 1041 | sizeof(struct inet_bind_bucket), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1042 | SLAB_HWCACHE_ALIGN, NULL); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1043 | if (!dccp_hashinfo.bind_bucket_cachep) |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 1044 | goto out_free_percpu; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1045 | |
| 1046 | /* |
| 1047 | * Size and allocate the main established and bind bucket |
| 1048 | * hash tables. |
| 1049 | * |
| 1050 | * The methodology is similar to that of the buffer cache. |
| 1051 | */ |
| 1052 | if (num_physpages >= (128 * 1024)) |
| 1053 | goal = num_physpages >> (21 - PAGE_SHIFT); |
| 1054 | else |
| 1055 | goal = num_physpages >> (23 - PAGE_SHIFT); |
| 1056 | |
| 1057 | if (thash_entries) |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1058 | goal = (thash_entries * |
| 1059 | sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1060 | for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++) |
| 1061 | ; |
| 1062 | do { |
| 1063 | dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE / |
| 1064 | sizeof(struct inet_ehash_bucket); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1065 | while (dccp_hashinfo.ehash_size & |
| 1066 | (dccp_hashinfo.ehash_size - 1)) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1067 | dccp_hashinfo.ehash_size--; |
| 1068 | dccp_hashinfo.ehash = (struct inet_ehash_bucket *) |
Mel Gorman | 1c29b3f | 2009-07-29 15:04:10 -0700 | [diff] [blame] | 1069 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1070 | } while (!dccp_hashinfo.ehash && --ehash_order > 0); |
| 1071 | |
| 1072 | if (!dccp_hashinfo.ehash) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1073 | DCCP_CRIT("Failed to allocate DCCP established hash table"); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1074 | goto out_free_bind_bucket_cachep; |
| 1075 | } |
| 1076 | |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 1077 | for (i = 0; i < dccp_hashinfo.ehash_size; i++) { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 1078 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); |
| 1079 | INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1080 | } |
| 1081 | |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1082 | if (inet_ehash_locks_alloc(&dccp_hashinfo)) |
| 1083 | goto out_free_dccp_ehash; |
| 1084 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1085 | bhash_order = ehash_order; |
| 1086 | |
| 1087 | do { |
| 1088 | dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE / |
| 1089 | sizeof(struct inet_bind_hashbucket); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 1090 | if ((dccp_hashinfo.bhash_size > (64 * 1024)) && |
| 1091 | bhash_order > 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1092 | continue; |
| 1093 | dccp_hashinfo.bhash = (struct inet_bind_hashbucket *) |
Mel Gorman | 1c29b3f | 2009-07-29 15:04:10 -0700 | [diff] [blame] | 1094 | __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, bhash_order); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1095 | } while (!dccp_hashinfo.bhash && --bhash_order >= 0); |
| 1096 | |
| 1097 | if (!dccp_hashinfo.bhash) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 1098 | DCCP_CRIT("Failed to allocate DCCP bind hash table"); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1099 | goto out_free_dccp_locks; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1100 | } |
| 1101 | |
| 1102 | for (i = 0; i < dccp_hashinfo.bhash_size; i++) { |
| 1103 | spin_lock_init(&dccp_hashinfo.bhash[i].lock); |
| 1104 | INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain); |
| 1105 | } |
| 1106 | |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1107 | rc = dccp_mib_init(); |
Arnaldo Carvalho de Melo | fa23e2e | 2006-03-20 17:16:01 -0800 | [diff] [blame] | 1108 | if (rc) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1109 | goto out_free_dccp_bhash; |
| 1110 | |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1111 | rc = dccp_ackvec_init(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1112 | if (rc) |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1113 | goto out_free_dccp_mib; |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1114 | |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 1115 | rc = dccp_sysctl_init(); |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1116 | if (rc) |
| 1117 | goto out_ackvec_exit; |
Gerrit Renker | 4c70f38 | 2007-09-25 22:40:13 -0700 | [diff] [blame] | 1118 | |
Gerrit Renker | ddebc97 | 2009-01-04 21:42:53 -0800 | [diff] [blame] | 1119 | rc = ccid_initialize_builtins(); |
| 1120 | if (rc) |
| 1121 | goto out_sysctl_exit; |
| 1122 | |
Gerrit Renker | 4c70f38 | 2007-09-25 22:40:13 -0700 | [diff] [blame] | 1123 | dccp_timestamping_init(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1124 | out: |
| 1125 | return rc; |
Gerrit Renker | ddebc97 | 2009-01-04 21:42:53 -0800 | [diff] [blame] | 1126 | out_sysctl_exit: |
| 1127 | dccp_sysctl_exit(); |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1128 | out_ackvec_exit: |
| 1129 | dccp_ackvec_exit(); |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 1130 | out_free_dccp_mib: |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1131 | dccp_mib_exit(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1132 | out_free_dccp_bhash: |
| 1133 | free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order); |
| 1134 | dccp_hashinfo.bhash = NULL; |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1135 | out_free_dccp_locks: |
| 1136 | inet_ehash_locks_free(&dccp_hashinfo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1137 | out_free_dccp_ehash: |
| 1138 | free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order); |
| 1139 | dccp_hashinfo.ehash = NULL; |
| 1140 | out_free_bind_bucket_cachep: |
| 1141 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
| 1142 | dccp_hashinfo.bind_bucket_cachep = NULL; |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 1143 | out_free_percpu: |
| 1144 | percpu_counter_destroy(&dccp_orphan_count); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1145 | goto out; |
| 1146 | } |
| 1147 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1148 | static void __exit dccp_fini(void) |
| 1149 | { |
Gerrit Renker | ddebc97 | 2009-01-04 21:42:53 -0800 | [diff] [blame] | 1150 | ccid_cleanup_builtins(); |
Arnaldo Carvalho de Melo | 46f09ff | 2006-03-20 21:24:42 -0800 | [diff] [blame] | 1151 | dccp_mib_exit(); |
Arnaldo Carvalho de Melo | 725ba8e | 2005-08-13 20:35:39 -0300 | [diff] [blame] | 1152 | free_pages((unsigned long)dccp_hashinfo.bhash, |
| 1153 | get_order(dccp_hashinfo.bhash_size * |
| 1154 | sizeof(struct inet_bind_hashbucket))); |
| 1155 | free_pages((unsigned long)dccp_hashinfo.ehash, |
| 1156 | get_order(dccp_hashinfo.ehash_size * |
| 1157 | sizeof(struct inet_ehash_bucket))); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 1158 | inet_ehash_locks_free(&dccp_hashinfo); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1159 | kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep); |
Arnaldo Carvalho de Melo | 9b07ef5 | 2006-03-20 17:16:17 -0800 | [diff] [blame] | 1160 | dccp_ackvec_exit(); |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 1161 | dccp_sysctl_exit(); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1162 | } |
| 1163 | |
| 1164 | module_init(dccp_init); |
| 1165 | module_exit(dccp_fini); |
| 1166 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1167 | MODULE_LICENSE("GPL"); |
| 1168 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>"); |
| 1169 | MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol"); |