Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/output.c |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 3 | * |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 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 |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 13 | #include <linux/dccp.h> |
Herbert Xu | 48918a4 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 14 | #include <linux/kernel.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 15 | #include <linux/skbuff.h> |
| 16 | |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 17 | #include <net/inet_sock.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 18 | #include <net/sock.h> |
| 19 | |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 20 | #include "ackvec.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 21 | #include "ccid.h" |
| 22 | #include "dccp.h" |
| 23 | |
| 24 | static inline void dccp_event_ack_sent(struct sock *sk) |
| 25 | { |
| 26 | inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); |
| 27 | } |
| 28 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 29 | static void dccp_skb_entail(struct sock *sk, struct sk_buff *skb) |
Herbert Xu | 48918a4 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 30 | { |
| 31 | skb_set_owner_w(skb, sk); |
| 32 | WARN_ON(sk->sk_send_head); |
| 33 | sk->sk_send_head = skb; |
| 34 | } |
| 35 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 36 | /* |
| 37 | * All SKB's seen here are completely headerless. It is our |
| 38 | * job to build the DCCP header, and pass the packet down to |
| 39 | * IP so it can do the same plus pass the packet off to the |
| 40 | * device. |
| 41 | */ |
Herbert Xu | 48918a4 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 42 | static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 43 | { |
| 44 | if (likely(skb != NULL)) { |
| 45 | const struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | 57cca05 | 2005-12-13 23:16:16 -0800 | [diff] [blame] | 46 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 47 | struct dccp_sock *dp = dccp_sk(sk); |
| 48 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
| 49 | struct dccp_hdr *dh; |
| 50 | /* XXX For now we're using only 48 bits sequence numbers */ |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 51 | const u32 dccp_header_size = sizeof(*dh) + |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 52 | sizeof(struct dccp_hdr_ext) + |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 53 | dccp_packet_hdr_len(dcb->dccpd_type); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 54 | int err, set_ack = 1; |
| 55 | u64 ackno = dp->dccps_gsr; |
| 56 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 57 | dccp_inc_seqno(&dp->dccps_gss); |
| 58 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 59 | switch (dcb->dccpd_type) { |
| 60 | case DCCP_PKT_DATA: |
| 61 | set_ack = 0; |
Herbert Xu | edc9e81 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 62 | /* fall through */ |
| 63 | case DCCP_PKT_DATAACK: |
Gerrit Renker | ee1a159 | 2007-09-26 11:30:02 -0300 | [diff] [blame] | 64 | case DCCP_PKT_RESET: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 65 | break; |
Herbert Xu | edc9e81 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 66 | |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 67 | case DCCP_PKT_REQUEST: |
| 68 | set_ack = 0; |
| 69 | /* fall through */ |
| 70 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 71 | case DCCP_PKT_SYNC: |
| 72 | case DCCP_PKT_SYNCACK: |
Gerrit Renker | b0d045c | 2007-09-25 22:42:27 -0700 | [diff] [blame] | 73 | ackno = dcb->dccpd_ack_seq; |
Herbert Xu | edc9e81 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 74 | /* fall through */ |
| 75 | default: |
| 76 | /* |
Gerrit Renker | ee1a159 | 2007-09-26 11:30:02 -0300 | [diff] [blame] | 77 | * Set owner/destructor: some skbs are allocated via |
| 78 | * alloc_skb (e.g. when retransmission may happen). |
| 79 | * Only Data, DataAck, and Reset packets should come |
| 80 | * through here with skb->sk set. |
Herbert Xu | edc9e81 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 81 | */ |
| 82 | WARN_ON(skb->sk); |
| 83 | skb_set_owner_w(skb, sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 84 | break; |
| 85 | } |
Arnaldo Carvalho de Melo | 2411772 | 2005-08-21 05:40:16 -0300 | [diff] [blame] | 86 | |
| 87 | dcb->dccpd_seq = dp->dccps_gss; |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 88 | |
| 89 | if (dccp_insert_options(sk, skb)) { |
| 90 | kfree_skb(skb); |
| 91 | return -EPROTO; |
| 92 | } |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 93 | |
Herbert Xu | fda0fd6 | 2005-10-14 16:38:49 +1000 | [diff] [blame] | 94 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 95 | /* Build DCCP header and checksum it. */ |
Gerrit Renker | 9b42078 | 2006-11-10 11:22:32 -0200 | [diff] [blame] | 96 | dh = dccp_zeroed_hdr(skb, dccp_header_size); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 97 | dh->dccph_type = dcb->dccpd_type; |
| 98 | dh->dccph_sport = inet->sport; |
| 99 | dh->dccph_dport = inet->dport; |
| 100 | dh->dccph_doff = (dccp_header_size + dcb->dccpd_opt_len) / 4; |
| 101 | dh->dccph_ccval = dcb->dccpd_ccval; |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 102 | dh->dccph_cscov = dp->dccps_pcslen; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 103 | /* XXX For now we're using only 48 bits sequence numbers */ |
| 104 | dh->dccph_x = 1; |
| 105 | |
| 106 | dp->dccps_awh = dp->dccps_gss; |
| 107 | dccp_hdr_set_seq(dh, dp->dccps_gss); |
| 108 | if (set_ack) |
| 109 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), ackno); |
| 110 | |
| 111 | switch (dcb->dccpd_type) { |
| 112 | case DCCP_PKT_REQUEST: |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 113 | dccp_hdr_request(skb)->dccph_req_service = |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 114 | dp->dccps_service; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 115 | break; |
| 116 | case DCCP_PKT_RESET: |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 117 | dccp_hdr_reset(skb)->dccph_reset_code = |
| 118 | dcb->dccpd_reset_code; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 119 | break; |
| 120 | } |
| 121 | |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 122 | icsk->icsk_af_ops->send_check(sk, 0, skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 123 | |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 124 | if (set_ack) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 125 | dccp_event_ack_sent(sk); |
| 126 | |
| 127 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
| 128 | |
David S. Miller | e89862f | 2007-01-26 01:04:55 -0800 | [diff] [blame] | 129 | err = icsk->icsk_af_ops->queue_xmit(skb, 0); |
Gerrit Renker | b9df3cb | 2006-11-14 11:21:36 -0200 | [diff] [blame] | 130 | return net_xmit_eval(err); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 131 | } |
| 132 | return -ENOBUFS; |
| 133 | } |
| 134 | |
Gerrit Renker | 6179983 | 2007-12-13 23:37:55 -0200 | [diff] [blame] | 135 | /** |
| 136 | * dccp_determine_ccmps - Find out about CCID-specfic packet-size limits |
| 137 | * We only consider the HC-sender CCID for setting the CCMPS (RFC 4340, 14.), |
| 138 | * since the RX CCID is restricted to feedback packets (Acks), which are small |
| 139 | * in comparison with the data traffic. A value of 0 means "no current CCMPS". |
| 140 | */ |
| 141 | static u32 dccp_determine_ccmps(const struct dccp_sock *dp) |
| 142 | { |
| 143 | const struct ccid *tx_ccid = dp->dccps_hc_tx_ccid; |
| 144 | |
| 145 | if (tx_ccid == NULL || tx_ccid->ccid_ops == NULL) |
| 146 | return 0; |
| 147 | return tx_ccid->ccid_ops->ccid_ccmps; |
| 148 | } |
| 149 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 150 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu) |
| 151 | { |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 152 | struct inet_connection_sock *icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 153 | struct dccp_sock *dp = dccp_sk(sk); |
Gerrit Renker | 6179983 | 2007-12-13 23:37:55 -0200 | [diff] [blame] | 154 | u32 ccmps = dccp_determine_ccmps(dp); |
| 155 | int cur_mps = ccmps ? min(pmtu, ccmps) : pmtu; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 156 | |
Gerrit Renker | 6179983 | 2007-12-13 23:37:55 -0200 | [diff] [blame] | 157 | /* Account for header lengths and IPv4/v6 option overhead */ |
| 158 | cur_mps -= (icsk->icsk_af_ops->net_header_len + icsk->icsk_ext_hdr_len + |
| 159 | sizeof(struct dccp_hdr) + sizeof(struct dccp_hdr_ext)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 160 | |
| 161 | /* |
| 162 | * FIXME: this should come from the CCID infrastructure, where, say, |
| 163 | * TFRC will say it wants TIMESTAMPS, ELAPSED time, etc, for now lets |
| 164 | * put a rough estimate for NDP + TIMESTAMP + TIMESTAMP_ECHO + ELAPSED |
| 165 | * TIME + TFRC_OPT_LOSS_EVENT_RATE + TFRC_OPT_RECEIVE_RATE + padding to |
| 166 | * make it a multiple of 4 |
| 167 | */ |
| 168 | |
Gerrit Renker | 6179983 | 2007-12-13 23:37:55 -0200 | [diff] [blame] | 169 | cur_mps -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 170 | |
| 171 | /* And store cached results */ |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 172 | icsk->icsk_pmtu_cookie = pmtu; |
Gerrit Renker | 6179983 | 2007-12-13 23:37:55 -0200 | [diff] [blame] | 173 | dp->dccps_mss_cache = cur_mps; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 174 | |
Gerrit Renker | 6179983 | 2007-12-13 23:37:55 -0200 | [diff] [blame] | 175 | return cur_mps; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 178 | EXPORT_SYMBOL_GPL(dccp_sync_mss); |
| 179 | |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 180 | void dccp_write_space(struct sock *sk) |
| 181 | { |
| 182 | read_lock(&sk->sk_callback_lock); |
| 183 | |
| 184 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 185 | wake_up_interruptible(sk->sk_sleep); |
| 186 | /* Should agree with poll, otherwise some programs break */ |
| 187 | if (sock_writeable(sk)) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 188 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 189 | |
| 190 | read_unlock(&sk->sk_callback_lock); |
| 191 | } |
| 192 | |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 193 | /** |
| 194 | * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet |
Gerrit Renker | bc84987 | 2007-10-04 14:38:49 -0700 | [diff] [blame] | 195 | * @sk: socket to wait for |
| 196 | * @skb: current skb to pass on for waiting |
| 197 | * @delay: sleep timeout in milliseconds (> 0) |
| 198 | * This function is called by default when the socket is closed, and |
| 199 | * when a non-zero linger time is set on the socket. For consistency |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 200 | */ |
Gerrit Renker | bc84987 | 2007-10-04 14:38:49 -0700 | [diff] [blame] | 201 | static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb, int delay) |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 202 | { |
| 203 | struct dccp_sock *dp = dccp_sk(sk); |
| 204 | DEFINE_WAIT(wait); |
Gerrit Renker | bc84987 | 2007-10-04 14:38:49 -0700 | [diff] [blame] | 205 | unsigned long jiffdelay; |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 206 | int rc; |
| 207 | |
Gerrit Renker | bc84987 | 2007-10-04 14:38:49 -0700 | [diff] [blame] | 208 | do { |
| 209 | dccp_pr_debug("delayed send by %d msec\n", delay); |
| 210 | jiffdelay = msecs_to_jiffies(delay); |
| 211 | |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 212 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 213 | |
Gerrit Renker | bc84987 | 2007-10-04 14:38:49 -0700 | [diff] [blame] | 214 | sk->sk_write_pending++; |
| 215 | release_sock(sk); |
| 216 | schedule_timeout(jiffdelay); |
| 217 | lock_sock(sk); |
| 218 | sk->sk_write_pending--; |
| 219 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 220 | if (sk->sk_err) |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 221 | goto do_error; |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 222 | if (signal_pending(current)) |
| 223 | goto do_interrupted; |
| 224 | |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 225 | rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb); |
Gerrit Renker | bc84987 | 2007-10-04 14:38:49 -0700 | [diff] [blame] | 226 | } while ((delay = rc) > 0); |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 227 | out: |
| 228 | finish_wait(sk->sk_sleep, &wait); |
| 229 | return rc; |
| 230 | |
| 231 | do_error: |
| 232 | rc = -EPIPE; |
| 233 | goto out; |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 234 | do_interrupted: |
Ian McDonald | 5cc3741d | 2006-12-09 23:56:09 -0200 | [diff] [blame] | 235 | rc = -EINTR; |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 236 | goto out; |
| 237 | } |
| 238 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 239 | void dccp_write_xmit(struct sock *sk, int block) |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 240 | { |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 241 | struct dccp_sock *dp = dccp_sk(sk); |
| 242 | struct sk_buff *skb; |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 243 | |
| 244 | while ((skb = skb_peek(&sk->sk_write_queue))) { |
Gerrit Renker | 6b57c93 | 2006-11-28 19:55:06 -0200 | [diff] [blame] | 245 | int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb); |
Arnaldo Carvalho de Melo | d6809c1 | 2005-08-27 03:06:35 -0300 | [diff] [blame] | 246 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 247 | if (err > 0) { |
| 248 | if (!block) { |
| 249 | sk_reset_timer(sk, &dp->dccps_xmit_timer, |
| 250 | msecs_to_jiffies(err)+jiffies); |
| 251 | break; |
Ian McDonald | 5cc3741d | 2006-12-09 23:56:09 -0200 | [diff] [blame] | 252 | } else |
Gerrit Renker | bc84987 | 2007-10-04 14:38:49 -0700 | [diff] [blame] | 253 | err = dccp_wait_for_ccid(sk, skb, err); |
Gerrit Renker | f6282f4 | 2006-12-10 00:05:12 -0200 | [diff] [blame] | 254 | if (err && err != -EINTR) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 255 | DCCP_BUG("err=%d after dccp_wait_for_ccid", err); |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 256 | } |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 257 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 258 | skb_dequeue(&sk->sk_write_queue); |
| 259 | if (err == 0) { |
| 260 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
| 261 | const int len = skb->len; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 262 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 263 | if (sk->sk_state == DCCP_PARTOPEN) { |
| 264 | /* See 8.1.5. Handshake Completion */ |
| 265 | inet_csk_schedule_ack(sk); |
| 266 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 267 | inet_csk(sk)->icsk_rto, |
| 268 | DCCP_RTO_MAX); |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 269 | dcb->dccpd_type = DCCP_PKT_DATAACK; |
| 270 | } else if (dccp_ack_pending(sk)) |
| 271 | dcb->dccpd_type = DCCP_PKT_DATAACK; |
| 272 | else |
| 273 | dcb->dccpd_type = DCCP_PKT_DATA; |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 274 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 275 | err = dccp_transmit_skb(sk, skb); |
| 276 | ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len); |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 277 | if (err) |
| 278 | DCCP_BUG("err=%d after ccid_hc_tx_packet_sent", |
| 279 | err); |
Gerrit Renker | f6282f4 | 2006-12-10 00:05:12 -0200 | [diff] [blame] | 280 | } else { |
Gerrit Renker | 6626e36 | 2007-03-20 15:00:28 -0300 | [diff] [blame] | 281 | dccp_pr_debug("packet discarded due to err=%d\n", err); |
Patrick McHardy | b08d584 | 2007-02-27 09:57:37 -0800 | [diff] [blame] | 282 | kfree_skb(skb); |
Gerrit Renker | f6282f4 | 2006-12-10 00:05:12 -0200 | [diff] [blame] | 283 | } |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 284 | } |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 285 | } |
| 286 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 287 | int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb) |
| 288 | { |
Arnaldo Carvalho de Melo | 57cca05 | 2005-12-13 23:16:16 -0800 | [diff] [blame] | 289 | if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk) != 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 290 | return -EHOSTUNREACH; /* Routing failure or similar. */ |
| 291 | |
| 292 | return dccp_transmit_skb(sk, (skb_cloned(skb) ? |
| 293 | pskb_copy(skb, GFP_ATOMIC): |
| 294 | skb_clone(skb, GFP_ATOMIC))); |
| 295 | } |
| 296 | |
| 297 | struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, |
| 298 | struct request_sock *req) |
| 299 | { |
| 300 | struct dccp_hdr *dh; |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 301 | struct dccp_request_sock *dreq; |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 302 | const u32 dccp_header_size = sizeof(struct dccp_hdr) + |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 303 | sizeof(struct dccp_hdr_ext) + |
| 304 | sizeof(struct dccp_hdr_response); |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 305 | struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 306 | GFP_ATOMIC); |
| 307 | if (skb == NULL) |
| 308 | return NULL; |
| 309 | |
| 310 | /* Reserve space for headers. */ |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 311 | skb_reserve(skb, sk->sk_prot->max_header); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 312 | |
| 313 | skb->dst = dst_clone(dst); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 314 | |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 315 | dreq = dccp_rsk(req); |
Gerrit Renker | e11d9d3 | 2006-11-13 13:12:07 -0200 | [diff] [blame] | 316 | if (inet_rsk(req)->acked) /* increase ISS upon retransmission */ |
| 317 | dccp_inc_seqno(&dreq->dreq_iss); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 318 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE; |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 319 | DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss; |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 320 | |
Gerrit Renker | af3b867 | 2007-12-13 12:38:11 -0200 | [diff] [blame] | 321 | if (dccp_insert_options_rsk(dreq, skb)) { |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 322 | kfree_skb(skb); |
| 323 | return NULL; |
| 324 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 325 | |
Gerrit Renker | 09dbc38 | 2006-11-14 12:57:34 -0200 | [diff] [blame] | 326 | /* Build and checksum header */ |
Gerrit Renker | 9b42078 | 2006-11-10 11:22:32 -0200 | [diff] [blame] | 327 | dh = dccp_zeroed_hdr(skb, dccp_header_size); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 328 | |
| 329 | dh->dccph_sport = inet_sk(sk)->sport; |
| 330 | dh->dccph_dport = inet_rsk(req)->rmt_port; |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 331 | dh->dccph_doff = (dccp_header_size + |
| 332 | DCCP_SKB_CB(skb)->dccpd_opt_len) / 4; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 333 | dh->dccph_type = DCCP_PKT_RESPONSE; |
| 334 | dh->dccph_x = 1; |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 335 | dccp_hdr_set_seq(dh, dreq->dreq_iss); |
| 336 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dreq->dreq_isr); |
| 337 | dccp_hdr_response(skb)->dccph_resp_service = dreq->dreq_service; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 338 | |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 339 | dccp_csum_outgoing(skb); |
| 340 | |
Gerrit Renker | e11d9d3 | 2006-11-13 13:12:07 -0200 | [diff] [blame] | 341 | /* We use `acked' to remember that a Response was already sent. */ |
| 342 | inet_rsk(req)->acked = 1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 343 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
| 344 | return skb; |
| 345 | } |
| 346 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 347 | EXPORT_SYMBOL_GPL(dccp_make_response); |
| 348 | |
Gerrit Renker | e356d37 | 2007-09-26 14:35:19 -0300 | [diff] [blame] | 349 | /* answer offending packet in @rcv_skb with Reset from control socket @ctl */ |
| 350 | struct sk_buff *dccp_ctl_make_reset(struct socket *ctl, struct sk_buff *rcv_skb) |
| 351 | { |
| 352 | struct dccp_hdr *rxdh = dccp_hdr(rcv_skb), *dh; |
| 353 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(rcv_skb); |
| 354 | const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) + |
| 355 | sizeof(struct dccp_hdr_ext) + |
| 356 | sizeof(struct dccp_hdr_reset); |
| 357 | struct dccp_hdr_reset *dhr; |
| 358 | struct sk_buff *skb; |
| 359 | |
| 360 | skb = alloc_skb(ctl->sk->sk_prot->max_header, GFP_ATOMIC); |
| 361 | if (skb == NULL) |
| 362 | return NULL; |
| 363 | |
| 364 | skb_reserve(skb, ctl->sk->sk_prot->max_header); |
| 365 | |
| 366 | /* Swap the send and the receive. */ |
| 367 | dh = dccp_zeroed_hdr(skb, dccp_hdr_reset_len); |
| 368 | dh->dccph_type = DCCP_PKT_RESET; |
| 369 | dh->dccph_sport = rxdh->dccph_dport; |
| 370 | dh->dccph_dport = rxdh->dccph_sport; |
| 371 | dh->dccph_doff = dccp_hdr_reset_len / 4; |
| 372 | dh->dccph_x = 1; |
| 373 | |
| 374 | dhr = dccp_hdr_reset(skb); |
| 375 | dhr->dccph_reset_code = dcb->dccpd_reset_code; |
| 376 | |
| 377 | switch (dcb->dccpd_reset_code) { |
| 378 | case DCCP_RESET_CODE_PACKET_ERROR: |
| 379 | dhr->dccph_reset_data[0] = rxdh->dccph_type; |
| 380 | break; |
| 381 | case DCCP_RESET_CODE_OPTION_ERROR: /* fall through */ |
| 382 | case DCCP_RESET_CODE_MANDATORY_ERROR: |
| 383 | memcpy(dhr->dccph_reset_data, dcb->dccpd_reset_data, 3); |
| 384 | break; |
| 385 | } |
| 386 | /* |
| 387 | * From RFC 4340, 8.3.1: |
| 388 | * If P.ackno exists, set R.seqno := P.ackno + 1. |
| 389 | * Else set R.seqno := 0. |
| 390 | */ |
| 391 | if (dcb->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ) |
| 392 | dccp_hdr_set_seq(dh, ADD48(dcb->dccpd_ack_seq, 1)); |
| 393 | dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dcb->dccpd_seq); |
| 394 | |
| 395 | dccp_csum_outgoing(skb); |
| 396 | return skb; |
| 397 | } |
| 398 | |
| 399 | EXPORT_SYMBOL_GPL(dccp_ctl_make_reset); |
| 400 | |
Gerrit Renker | ee1a159 | 2007-09-26 11:30:02 -0300 | [diff] [blame] | 401 | /* send Reset on established socket, to close or abort the connection */ |
Arnaldo Carvalho de Melo | 017487d | 2006-03-20 19:25:24 -0800 | [diff] [blame] | 402 | int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code) |
| 403 | { |
Gerrit Renker | ee1a159 | 2007-09-26 11:30:02 -0300 | [diff] [blame] | 404 | struct sk_buff *skb; |
Arnaldo Carvalho de Melo | 017487d | 2006-03-20 19:25:24 -0800 | [diff] [blame] | 405 | /* |
| 406 | * FIXME: what if rebuild_header fails? |
| 407 | * Should we be doing a rebuild_header here? |
| 408 | */ |
Gerrit Renker | f53dc67 | 2007-11-28 08:35:08 +0000 | [diff] [blame] | 409 | int err = inet_csk(sk)->icsk_af_ops->rebuild_header(sk); |
Arnaldo Carvalho de Melo | 017487d | 2006-03-20 19:25:24 -0800 | [diff] [blame] | 410 | |
Gerrit Renker | ee1a159 | 2007-09-26 11:30:02 -0300 | [diff] [blame] | 411 | if (err != 0) |
| 412 | return err; |
Arnaldo Carvalho de Melo | 017487d | 2006-03-20 19:25:24 -0800 | [diff] [blame] | 413 | |
Gerrit Renker | ee1a159 | 2007-09-26 11:30:02 -0300 | [diff] [blame] | 414 | skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1, GFP_ATOMIC); |
| 415 | if (skb == NULL) |
| 416 | return -ENOBUFS; |
| 417 | |
| 418 | /* Reserve space for headers and prepare control bits. */ |
| 419 | skb_reserve(skb, sk->sk_prot->max_header); |
| 420 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET; |
| 421 | DCCP_SKB_CB(skb)->dccpd_reset_code = code; |
| 422 | |
| 423 | return dccp_transmit_skb(sk, skb); |
Arnaldo Carvalho de Melo | 017487d | 2006-03-20 19:25:24 -0800 | [diff] [blame] | 424 | } |
| 425 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 426 | /* |
| 427 | * Do all connect socket setups that can be done AF independent. |
| 428 | */ |
| 429 | static inline void dccp_connect_init(struct sock *sk) |
| 430 | { |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 431 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 432 | struct dst_entry *dst = __sk_dst_get(sk); |
| 433 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 434 | |
| 435 | sk->sk_err = 0; |
| 436 | sock_reset_flag(sk, SOCK_DONE); |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 437 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 438 | dccp_sync_mss(sk, dst_mtu(dst)); |
| 439 | |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 440 | /* |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 441 | * SWL and AWL are initially adjusted so that they are not less than |
| 442 | * the initial Sequence Numbers received and sent, respectively: |
| 443 | * SWL := max(GSR + 1 - floor(W/4), ISR), |
| 444 | * AWL := max(GSS - W' + 1, ISS). |
| 445 | * These adjustments MUST be applied only at the beginning of the |
| 446 | * connection. |
Arnaldo Carvalho de Melo | 8109b02 | 2006-12-10 16:01:18 -0200 | [diff] [blame] | 447 | */ |
Gerrit Renker | d7f7365 | 2006-11-13 13:34:38 -0200 | [diff] [blame] | 448 | dccp_update_gss(sk, dp->dccps_iss); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 449 | dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 450 | |
Gerrit Renker | d7f7365 | 2006-11-13 13:34:38 -0200 | [diff] [blame] | 451 | /* S.GAR - greatest valid acknowledgement number received on a non-Sync; |
| 452 | * initialized to S.ISS (sec. 8.5) */ |
| 453 | dp->dccps_gar = dp->dccps_iss; |
| 454 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 455 | icsk->icsk_retransmits = 0; |
| 456 | } |
| 457 | |
| 458 | int dccp_connect(struct sock *sk) |
| 459 | { |
| 460 | struct sk_buff *skb; |
| 461 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 462 | |
| 463 | dccp_connect_init(sk); |
| 464 | |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 465 | skb = alloc_skb(sk->sk_prot->max_header, sk->sk_allocation); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 466 | if (unlikely(skb == NULL)) |
| 467 | return -ENOBUFS; |
| 468 | |
| 469 | /* Reserve space for headers. */ |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 470 | skb_reserve(skb, sk->sk_prot->max_header); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 471 | |
| 472 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 473 | |
Herbert Xu | 48918a4 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 474 | dccp_skb_entail(sk, skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 475 | dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL)); |
| 476 | DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS); |
| 477 | |
| 478 | /* Timer for repeating the REQUEST until an answer. */ |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 479 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 480 | icsk->icsk_rto, DCCP_RTO_MAX); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 481 | return 0; |
| 482 | } |
| 483 | |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 484 | EXPORT_SYMBOL_GPL(dccp_connect); |
| 485 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 486 | void dccp_send_ack(struct sock *sk) |
| 487 | { |
| 488 | /* If we have been reset, we may not send again. */ |
| 489 | if (sk->sk_state != DCCP_CLOSED) { |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 490 | struct sk_buff *skb = alloc_skb(sk->sk_prot->max_header, |
| 491 | GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 492 | |
| 493 | if (skb == NULL) { |
| 494 | inet_csk_schedule_ack(sk); |
| 495 | inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN; |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 496 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, |
| 497 | TCP_DELACK_MAX, |
| 498 | DCCP_RTO_MAX); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 499 | return; |
| 500 | } |
| 501 | |
| 502 | /* Reserve space for headers */ |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 503 | skb_reserve(skb, sk->sk_prot->max_header); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 504 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 505 | dccp_transmit_skb(sk, skb); |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | EXPORT_SYMBOL_GPL(dccp_send_ack); |
| 510 | |
Gerrit Renker | 727ecc5 | 2007-09-26 11:26:04 -0300 | [diff] [blame] | 511 | /* FIXME: Is this still necessary (11.3) - currently nowhere used by DCCP. */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 512 | void dccp_send_delayed_ack(struct sock *sk) |
| 513 | { |
| 514 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 515 | /* |
| 516 | * FIXME: tune this timer. elapsed time fixes the skew, so no problem |
| 517 | * with using 2s, and active senders also piggyback the ACK into a |
| 518 | * DATAACK packet, so this is really for quiescent senders. |
| 519 | */ |
| 520 | unsigned long timeout = jiffies + 2 * HZ; |
| 521 | |
| 522 | /* Use new timeout only if there wasn't a older one earlier. */ |
| 523 | if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) { |
| 524 | /* If delack timer was blocked or is about to expire, |
| 525 | * send ACK now. |
| 526 | * |
| 527 | * FIXME: check the "about to expire" part |
| 528 | */ |
| 529 | if (icsk->icsk_ack.blocked) { |
| 530 | dccp_send_ack(sk); |
| 531 | return; |
| 532 | } |
| 533 | |
| 534 | if (!time_before(timeout, icsk->icsk_ack.timeout)) |
| 535 | timeout = icsk->icsk_ack.timeout; |
| 536 | } |
| 537 | icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER; |
| 538 | icsk->icsk_ack.timeout = timeout; |
| 539 | sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout); |
| 540 | } |
| 541 | |
Gerrit Renker | b0d045c | 2007-09-25 22:42:27 -0700 | [diff] [blame] | 542 | void dccp_send_sync(struct sock *sk, const u64 ackno, |
Arnaldo Carvalho de Melo | e92ae93 | 2005-08-17 03:10:59 -0300 | [diff] [blame] | 543 | const enum dccp_pkt_type pkt_type) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 544 | { |
| 545 | /* |
| 546 | * We are not putting this on the write queue, so |
| 547 | * dccp_transmit_skb() will set the ownership to this |
| 548 | * sock. |
| 549 | */ |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 550 | struct sk_buff *skb = alloc_skb(sk->sk_prot->max_header, GFP_ATOMIC); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 551 | |
Gerrit Renker | b0d045c | 2007-09-25 22:42:27 -0700 | [diff] [blame] | 552 | if (skb == NULL) { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 553 | /* FIXME: how to make sure the sync is sent? */ |
Gerrit Renker | b0d045c | 2007-09-25 22:42:27 -0700 | [diff] [blame] | 554 | DCCP_CRIT("could not send %s", dccp_packet_name(pkt_type)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 555 | return; |
Gerrit Renker | b0d045c | 2007-09-25 22:42:27 -0700 | [diff] [blame] | 556 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 557 | |
| 558 | /* Reserve space for headers and prepare control bits. */ |
Arnaldo Carvalho de Melo | 118b2c9 | 2006-03-20 22:31:09 -0800 | [diff] [blame] | 559 | skb_reserve(skb, sk->sk_prot->max_header); |
Arnaldo Carvalho de Melo | e92ae93 | 2005-08-17 03:10:59 -0300 | [diff] [blame] | 560 | DCCP_SKB_CB(skb)->dccpd_type = pkt_type; |
Gerrit Renker | b0d045c | 2007-09-25 22:42:27 -0700 | [diff] [blame] | 561 | DCCP_SKB_CB(skb)->dccpd_ack_seq = ackno; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 562 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 563 | dccp_transmit_skb(sk, skb); |
| 564 | } |
| 565 | |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 566 | EXPORT_SYMBOL_GPL(dccp_send_sync); |
| 567 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 568 | /* |
| 569 | * Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This |
| 570 | * cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under |
| 571 | * any circumstances. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 572 | */ |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 573 | void dccp_send_close(struct sock *sk, const int active) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 574 | { |
| 575 | struct dccp_sock *dp = dccp_sk(sk); |
| 576 | struct sk_buff *skb; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 577 | const gfp_t prio = active ? GFP_KERNEL : GFP_ATOMIC; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 578 | |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 579 | skb = alloc_skb(sk->sk_prot->max_header, prio); |
| 580 | if (skb == NULL) |
| 581 | return; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 582 | |
| 583 | /* Reserve space for headers and prepare control bits. */ |
| 584 | skb_reserve(skb, sk->sk_prot->max_header); |
Gerrit Renker | b8599d2 | 2007-12-13 12:25:01 -0200 | [diff] [blame] | 585 | if (dp->dccps_role == DCCP_ROLE_SERVER && !dp->dccps_server_timewait) |
| 586 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSEREQ; |
| 587 | else |
| 588 | DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_CLOSE; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 589 | |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 590 | if (active) { |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 591 | dccp_write_xmit(sk, 1); |
Herbert Xu | 48918a4 | 2005-10-30 11:20:59 +1100 | [diff] [blame] | 592 | dccp_skb_entail(sk, skb); |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 593 | dccp_transmit_skb(sk, skb_clone(skb, prio)); |
Gerrit Renker | 92d3192 | 2007-12-13 12:02:43 -0200 | [diff] [blame] | 594 | /* |
| 595 | * Retransmission timer for active-close: RFC 4340, 8.3 requires |
| 596 | * to retransmit the Close/CloseReq until the CLOSING/CLOSEREQ |
| 597 | * state can be left. The initial timeout is 2 RTTs. |
| 598 | * Since RTT measurement is done by the CCIDs, there is no easy |
| 599 | * way to get an RTT sample. The fallback RTT from RFC 4340, 3.4 |
| 600 | * is too low (200ms); we use a high value to avoid unnecessary |
| 601 | * retransmissions when the link RTT is > 0.2 seconds. |
| 602 | * FIXME: Let main module sample RTTs and use that instead. |
| 603 | */ |
| 604 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 605 | DCCP_TIMEOUT_INIT, DCCP_RTO_MAX); |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 606 | } else |
| 607 | dccp_transmit_skb(sk, skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 608 | } |