output.c revision 09dbc3895e3242346bd434dae743c456fd28fc6a
17c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo/* 27c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * net/dccp/output.c 37c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 47c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * An implementation of the DCCP protocol 57c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 67c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 77c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or 87c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * modify it under the terms of the GNU General Public License 97c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * as published by the Free Software Foundation; either version 107c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 2 of the License, or (at your option) any later version. 117c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 127c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 137c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#include <linux/dccp.h> 1448918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu#include <linux/kernel.h> 157c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#include <linux/skbuff.h> 167c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1714c850212ed8f8cbb5972ad6b8812e08a0bc901cArnaldo Carvalho de Melo#include <net/inet_sock.h> 187c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#include <net/sock.h> 197c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 20ae31c3399d17b1f7bc1742724f70476b5417744fArnaldo Carvalho de Melo#include "ackvec.h" 217c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#include "ccid.h" 227c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo#include "dccp.h" 237c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 247c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melostatic inline void dccp_event_ack_sent(struct sock *sk) 257c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 267c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK); 277c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 287c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 29c25a18ba347f091d1ce620ba33e6772b60a528e1Arnaldo Carvalho de Melostatic void dccp_skb_entail(struct sock *sk, struct sk_buff *skb) 3048918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu{ 3148918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu skb_set_owner_w(skb, sk); 3248918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu WARN_ON(sk->sk_send_head); 3348918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu sk->sk_send_head = skb; 3448918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu} 3548918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu 367c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo/* 377c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * All SKB's seen here are completely headerless. It is our 387c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * job to build the DCCP header, and pass the packet down to 397c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * IP so it can do the same plus pass the packet off to the 407c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * device. 417c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 4248918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xustatic int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb) 437c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 447c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (likely(skb != NULL)) { 457c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo const struct inet_sock *inet = inet_sk(sk); 4657cca05af1e20fdc65b55be52c042c234f86c866Arnaldo Carvalho de Melo const struct inet_connection_sock *icsk = inet_csk(sk); 477c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 487c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); 497c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_hdr *dh; 507c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* XXX For now we're using only 48 bits sequence numbers */ 51118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo const u32 dccp_header_size = sizeof(*dh) + 527c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sizeof(struct dccp_hdr_ext) + 537690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo dccp_packet_hdr_len(dcb->dccpd_type); 547c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo int err, set_ack = 1; 557c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo u64 ackno = dp->dccps_gsr; 567c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 577c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_inc_seqno(&dp->dccps_gss); 587c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 597c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo switch (dcb->dccpd_type) { 607c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo case DCCP_PKT_DATA: 617c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo set_ack = 0; 62edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu /* fall through */ 63edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu case DCCP_PKT_DATAACK: 647c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo break; 65edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu 66afe00251dd9b53d51de91ff0099961f42bbf3754Andrea Bittau case DCCP_PKT_REQUEST: 67afe00251dd9b53d51de91ff0099961f42bbf3754Andrea Bittau set_ack = 0; 68afe00251dd9b53d51de91ff0099961f42bbf3754Andrea Bittau /* fall through */ 69afe00251dd9b53d51de91ff0099961f42bbf3754Andrea Bittau 707c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo case DCCP_PKT_SYNC: 717c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo case DCCP_PKT_SYNCACK: 727c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo ackno = dcb->dccpd_seq; 73edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu /* fall through */ 74edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu default: 75edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu /* 76edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu * Only data packets should come through with skb->sk 77edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu * set. 78edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu */ 79edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu WARN_ON(skb->sk); 80edc9e81917157d1e73bf081d4fbcad7c34d32783Herbert Xu skb_set_owner_w(skb, sk); 817c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo break; 827c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 8324117727b753426d85ba09671c24854834f81b2cArnaldo Carvalho de Melo 8424117727b753426d85ba09671c24854834f81b2cArnaldo Carvalho de Melo dcb->dccpd_seq = dp->dccps_gss; 852d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo 862d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo if (dccp_insert_options(sk, skb)) { 872d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo kfree_skb(skb); 882d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo return -EPROTO; 892d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo } 907c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 91fda0fd6c5b722cc48e904e0daafedca275d332afHerbert Xu 927c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Build DCCP header and checksum it. */ 939b42078ed6edfe04e9dc9a59b946ad912aeef717Gerrit Renker dh = dccp_zeroed_hdr(skb, dccp_header_size); 947c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_type = dcb->dccpd_type; 957c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_sport = inet->sport; 967c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_dport = inet->dport; 977c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_doff = (dccp_header_size + dcb->dccpd_opt_len) / 4; 987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_ccval = dcb->dccpd_ccval; 996f4e5fff1e4d46714ea554fd83e44eab534e8b11Gerrit Renker dh->dccph_cscov = dp->dccps_pcslen; 1007c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* XXX For now we're using only 48 bits sequence numbers */ 1017c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_x = 1; 1027c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1037c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dp->dccps_awh = dp->dccps_gss; 1047c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_hdr_set_seq(dh, dp->dccps_gss); 1057c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (set_ack) 1067c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), ackno); 1077c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1087c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo switch (dcb->dccpd_type) { 1097c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo case DCCP_PKT_REQUEST: 1107690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo dccp_hdr_request(skb)->dccph_req_service = 11167e6b629212fa9ffb7420e8a88a41806af637e28Arnaldo Carvalho de Melo dp->dccps_service; 1127c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo break; 1137c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo case DCCP_PKT_RESET: 1147690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo dccp_hdr_reset(skb)->dccph_reset_code = 1157690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo dcb->dccpd_reset_code; 1167c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo break; 1177c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 1187c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1196f4e5fff1e4d46714ea554fd83e44eab534e8b11Gerrit Renker icsk->icsk_af_ops->send_check(sk, 0, skb); 1207c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1217ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo if (set_ack) 1227c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_event_ack_sent(sk); 1237c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1247c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_INC_STATS(DCCP_MIB_OUTSEGS); 1257c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 12649c5bfaffe8ae6e6440dc4bf78b03800960d93f5Herbert Xu memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 127931731123a103cfb3f70ac4b7abfc71d94ba1f03David S. Miller err = icsk->icsk_af_ops->queue_xmit(skb, sk, 0); 128b9df3cb8cf9a96e63dfdcd3056a9cbc71f2459e7Gerrit Renker return net_xmit_eval(err); 1297c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 1307c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return -ENOBUFS; 1317c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 1327c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1337c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melounsigned int dccp_sync_mss(struct sock *sk, u32 pmtu) 1347c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 135d83d8461f902c672bc1bd8fbc6a94e19f092da97Arnaldo Carvalho de Melo struct inet_connection_sock *icsk = inet_csk(sk); 1367c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 137d83d8461f902c672bc1bd8fbc6a94e19f092da97Arnaldo Carvalho de Melo int mss_now = (pmtu - icsk->icsk_af_ops->net_header_len - 13857cca05af1e20fdc65b55be52c042c234f86c866Arnaldo Carvalho de Melo sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext)); 1397c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1407c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Now subtract optional transport overhead */ 141d83d8461f902c672bc1bd8fbc6a94e19f092da97Arnaldo Carvalho de Melo mss_now -= icsk->icsk_ext_hdr_len; 1427c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1437c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* 1447c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * FIXME: this should come from the CCID infrastructure, where, say, 1457c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * TFRC will say it wants TIMESTAMPS, ELAPSED time, etc, for now lets 1467c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * put a rough estimate for NDP + TIMESTAMP + TIMESTAMP_ECHO + ELAPSED 1477c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * TIME + TFRC_OPT_LOSS_EVENT_RATE + TFRC_OPT_RECEIVE_RATE + padding to 1487c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * make it a multiple of 4 1497c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 1507c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1517c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo mss_now -= ((5 + 6 + 10 + 6 + 6 + 6 + 3) / 4) * 4; 1527c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1537c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* And store cached results */ 154d83d8461f902c672bc1bd8fbc6a94e19f092da97Arnaldo Carvalho de Melo icsk->icsk_pmtu_cookie = pmtu; 1557c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dp->dccps_mss_cache = mss_now; 1567c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 1577c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return mss_now; 1587c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 1597c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 160f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(dccp_sync_mss); 161f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo 162c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melovoid dccp_write_space(struct sock *sk) 163c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo{ 164c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo read_lock(&sk->sk_callback_lock); 165c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo 166c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 167c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo wake_up_interruptible(sk->sk_sleep); 168c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo /* Should agree with poll, otherwise some programs break */ 169c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo if (sock_writeable(sk)) 170c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo sk_wake_async(sk, 2, POLL_OUT); 171c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo 172c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo read_unlock(&sk->sk_callback_lock); 173c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo} 174c530cfb1ce1e8f230744c3f3bd86771f50725053Arnaldo Carvalho de Melo 175d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo/** 176d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo * dccp_wait_for_ccid - Wait for ccid to tell us we can send a packet 177d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo * @sk: socket to wait for 178d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo * @timeo: for how long 179d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo */ 180d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melostatic int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb, 181d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo long *timeo) 182d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo{ 183d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 184d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo DEFINE_WAIT(wait); 185d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo long delay; 186d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo int rc; 187d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo 188d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo while (1) { 189d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 190d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo 19197e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (sk->sk_err) 192d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo goto do_error; 193d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo if (!*timeo) 194d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo goto do_nonblock; 195d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo if (signal_pending(current)) 196d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo goto do_interrupted; 197d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo 198d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb, 199d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo skb->len); 200d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo if (rc <= 0) 201d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo break; 202d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo delay = msecs_to_jiffies(rc); 203d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo if (delay > *timeo || delay < 0) 204d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo goto do_nonblock; 205d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo 206d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo sk->sk_write_pending++; 207d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo release_sock(sk); 208d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo *timeo -= schedule_timeout(delay); 209d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo lock_sock(sk); 210d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo sk->sk_write_pending--; 211d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo } 212d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Meloout: 213d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo finish_wait(sk->sk_sleep, &wait); 214d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo return rc; 215d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo 216d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melodo_error: 217d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo rc = -EPIPE; 218d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo goto out; 219d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melodo_nonblock: 220d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo rc = -EAGAIN; 221d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo goto out; 222d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melodo_interrupted: 223d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo rc = sock_intr_errno(*timeo); 224d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo goto out; 225d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo} 226d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo 22797e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonaldstatic void dccp_write_xmit_timer(unsigned long data) { 22897e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald struct sock *sk = (struct sock *)data; 22997e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald struct dccp_sock *dp = dccp_sk(sk); 23097e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald 23197e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald bh_lock_sock(sk); 23297e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (sock_owned_by_user(sk)) 23397e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald sk_reset_timer(sk, &dp->dccps_xmit_timer, jiffies+1); 23497e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald else 23597e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dccp_write_xmit(sk, 0); 23697e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald bh_unlock_sock(sk); 23797e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald sock_put(sk); 23897e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald} 23997e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald 24097e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonaldvoid dccp_write_xmit(struct sock *sk, int block) 24127258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo{ 24297e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald struct dccp_sock *dp = dccp_sk(sk); 24397e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald struct sk_buff *skb; 244f45b3ec481581f24719d8ab0bc812c02fcedc2bcIan McDonald long timeo = DCCP_XMIT_TIMEO; /* If a packet is taking longer than 245f45b3ec481581f24719d8ab0bc812c02fcedc2bcIan McDonald this we have other issues */ 24697e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald 24797e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald while ((skb = skb_peek(&sk->sk_write_queue))) { 24897e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald int err = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb, 249d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo skb->len); 250d6809c12b3334a929c39bf08ea63bd819e0500f7Arnaldo Carvalho de Melo 25197e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (err > 0) { 25297e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (!block) { 25397e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald sk_reset_timer(sk, &dp->dccps_xmit_timer, 25497e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald msecs_to_jiffies(err)+jiffies); 25597e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald break; 256f45b3ec481581f24719d8ab0bc812c02fcedc2bcIan McDonald } else { 25797e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald err = dccp_wait_for_ccid(sk, skb, &timeo); 258f45b3ec481581f24719d8ab0bc812c02fcedc2bcIan McDonald timeo = DCCP_XMIT_TIMEO; 259f45b3ec481581f24719d8ab0bc812c02fcedc2bcIan McDonald } 26097e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (err) { 26197e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald printk(KERN_CRIT "%s:err at dccp_wait_for_ccid" 26297e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald " %d\n", __FUNCTION__, err); 26397e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dump_stack(); 26497e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald } 26597e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald } 26627258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo 26797e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald skb_dequeue(&sk->sk_write_queue); 26897e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (err == 0) { 26997e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); 27097e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald const int len = skb->len; 27127258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo 27297e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (sk->sk_state == DCCP_PARTOPEN) { 27397e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald /* See 8.1.5. Handshake Completion */ 27497e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald inet_csk_schedule_ack(sk); 27597e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, 27627258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo inet_csk(sk)->icsk_rto, 27727258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo DCCP_RTO_MAX); 27897e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dcb->dccpd_type = DCCP_PKT_DATAACK; 27997e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald } else if (dccp_ack_pending(sk)) 28097e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dcb->dccpd_type = DCCP_PKT_DATAACK; 28197e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald else 28297e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dcb->dccpd_type = DCCP_PKT_DATA; 28397e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald 28497e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald err = dccp_transmit_skb(sk, skb); 28597e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len); 28697e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald if (err) { 28797e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald printk(KERN_CRIT "%s:err from " 28897e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald "ccid_hc_tx_packet_sent %d\n", 28997e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald __FUNCTION__, err); 29097e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dump_stack(); 29197e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald } 29297e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald } else 29397e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald kfree(skb); 29497e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald } 29527258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo} 29627258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo 2977c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Meloint dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb) 2987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 29957cca05af1e20fdc65b55be52c042c234f86c866Arnaldo Carvalho de Melo if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk) != 0) 3007c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return -EHOSTUNREACH; /* Routing failure or similar. */ 3017c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3027c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return dccp_transmit_skb(sk, (skb_cloned(skb) ? 3037c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo pskb_copy(skb, GFP_ATOMIC): 3047c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo skb_clone(skb, GFP_ATOMIC))); 3057c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 3067c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3077c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melostruct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, 3087c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct request_sock *req) 3097c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 3107c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_hdr *dh; 31167e6b629212fa9ffb7420e8a88a41806af637e28Arnaldo Carvalho de Melo struct dccp_request_sock *dreq; 312118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo const u32 dccp_header_size = sizeof(struct dccp_hdr) + 3137c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sizeof(struct dccp_hdr_ext) + 3147c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sizeof(struct dccp_hdr_response); 315118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1, 3167c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo GFP_ATOMIC); 3177c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (skb == NULL) 3187c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return NULL; 3197c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3207c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Reserve space for headers. */ 321118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo skb_reserve(skb, sk->sk_prot->max_header); 3227c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3237c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo skb->dst = dst_clone(dst); 3247c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 32567e6b629212fa9ffb7420e8a88a41806af637e28Arnaldo Carvalho de Melo dreq = dccp_rsk(req); 326e11d9d30802278af22e78d8c10f348b683670cd9Gerrit Renker if (inet_rsk(req)->acked) /* increase ISS upon retransmission */ 327e11d9d30802278af22e78d8c10f348b683670cd9Gerrit Renker dccp_inc_seqno(&dreq->dreq_iss); 3287c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESPONSE; 32967e6b629212fa9ffb7420e8a88a41806af637e28Arnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_seq = dreq->dreq_iss; 3302d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo 3312d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo if (dccp_insert_options(sk, skb)) { 3322d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo kfree_skb(skb); 3332d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo return NULL; 3342d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo } 3357c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 33609dbc3895e3242346bd434dae743c456fd28fc6aGerrit Renker /* Build and checksum header */ 3379b42078ed6edfe04e9dc9a59b946ad912aeef717Gerrit Renker dh = dccp_zeroed_hdr(skb, dccp_header_size); 3387c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3397c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_sport = inet_sk(sk)->sport; 3407c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_dport = inet_rsk(req)->rmt_port; 3417690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo dh->dccph_doff = (dccp_header_size + 3427690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len) / 4; 3437c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_type = DCCP_PKT_RESPONSE; 3447c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_x = 1; 34567e6b629212fa9ffb7420e8a88a41806af637e28Arnaldo Carvalho de Melo dccp_hdr_set_seq(dh, dreq->dreq_iss); 34667e6b629212fa9ffb7420e8a88a41806af637e28Arnaldo Carvalho de Melo dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dreq->dreq_isr); 34767e6b629212fa9ffb7420e8a88a41806af637e28Arnaldo Carvalho de Melo dccp_hdr_response(skb)->dccph_resp_service = dreq->dreq_service; 3487c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3496f4e5fff1e4d46714ea554fd83e44eab534e8b11Gerrit Renker dccp_csum_outgoing(skb); 3506f4e5fff1e4d46714ea554fd83e44eab534e8b11Gerrit Renker 351e11d9d30802278af22e78d8c10f348b683670cd9Gerrit Renker /* We use `acked' to remember that a Response was already sent. */ 352e11d9d30802278af22e78d8c10f348b683670cd9Gerrit Renker inet_rsk(req)->acked = 1; 3537c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_INC_STATS(DCCP_MIB_OUTSEGS); 3547c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return skb; 3557c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 3567c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 357f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(dccp_make_response); 358f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo 359017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melostatic struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst, 360017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo const enum dccp_reset_codes code) 3617c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3627c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 3637c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_hdr *dh; 3647c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 365118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo const u32 dccp_header_size = sizeof(struct dccp_hdr) + 3667c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sizeof(struct dccp_hdr_ext) + 3677c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sizeof(struct dccp_hdr_reset); 368118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1, 3697c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo GFP_ATOMIC); 3707c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (skb == NULL) 3717c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return NULL; 3727c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3737c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Reserve space for headers. */ 374118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo skb_reserve(skb, sk->sk_prot->max_header); 3757c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3767c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo skb->dst = dst_clone(dst); 3777c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3787c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_inc_seqno(&dp->dccps_gss); 3797c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3807c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_reset_code = code; 3817c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET; 3827c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_seq = dp->dccps_gss; 3832d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo 3842d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo if (dccp_insert_options(sk, skb)) { 3852d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo kfree_skb(skb); 3862d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo return NULL; 3872d0817d11eaec57435feb61493331a763f732a2bArnaldo Carvalho de Melo } 3887c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3899b42078ed6edfe04e9dc9a59b946ad912aeef717Gerrit Renker dh = dccp_zeroed_hdr(skb, dccp_header_size); 3907c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 3917c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_sport = inet_sk(sk)->sport; 3927c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_dport = inet_sk(sk)->dport; 3937690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo dh->dccph_doff = (dccp_header_size + 3947690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len) / 4; 3957c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_type = DCCP_PKT_RESET; 3967c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dh->dccph_x = 1; 3977c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_hdr_set_seq(dh, dp->dccps_gss); 3987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr); 3997c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4007c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_hdr_reset(skb)->dccph_reset_code = code; 4016f4e5fff1e4d46714ea554fd83e44eab534e8b11Gerrit Renker inet_csk(sk)->icsk_af_ops->send_check(sk, 0, skb); 4027c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4037c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_INC_STATS(DCCP_MIB_OUTSEGS); 4047c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return skb; 4057c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 4067c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 407017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Meloint dccp_send_reset(struct sock *sk, enum dccp_reset_codes code) 408017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo{ 409017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo /* 410017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo * FIXME: what if rebuild_header fails? 411017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo * Should we be doing a rebuild_header here? 412017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo */ 413017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo int err = inet_sk_rebuild_header(sk); 414017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo 415017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo if (err == 0) { 416017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo struct sk_buff *skb = dccp_make_reset(sk, sk->sk_dst_cache, 417017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo code); 418017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo if (skb != NULL) { 419017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 420931731123a103cfb3f70ac4b7abfc71d94ba1f03David S. Miller err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, sk, 0); 421b9df3cb8cf9a96e63dfdcd3056a9cbc71f2459e7Gerrit Renker return net_xmit_eval(err); 422017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo } 423017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo } 424017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo 425017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo return err; 426017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo} 427017487d7d1e905a5bb529f6a2bc8cf8ea14e2307Arnaldo Carvalho de Melo 4287c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo/* 4297c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * Do all connect socket setups that can be done AF independent. 4307c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 4317c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melostatic inline void dccp_connect_init(struct sock *sk) 4327c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 433f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 4347c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dst_entry *dst = __sk_dst_get(sk); 4357c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct inet_connection_sock *icsk = inet_csk(sk); 4367c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4377c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sk->sk_err = 0; 4387c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sock_reset_flag(sk, SOCK_DONE); 4397c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4407c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_sync_mss(sk, dst_mtu(dst)); 4417c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 442f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo /* 443f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo * SWL and AWL are initially adjusted so that they are not less than 444f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo * the initial Sequence Numbers received and sent, respectively: 445f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo * SWL := max(GSR + 1 - floor(W/4), ISR), 446f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo * AWL := max(GSS - W' + 1, ISS). 447f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo * These adjustments MUST be applied only at the beginning of the 448f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo * connection. 449f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo */ 450d7f7365f5776723da6df73540d855069c2daaa5cGerrit Renker dccp_update_gss(sk, dp->dccps_iss); 451f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss)); 4527c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 453d7f7365f5776723da6df73540d855069c2daaa5cGerrit Renker /* S.GAR - greatest valid acknowledgement number received on a non-Sync; 454d7f7365f5776723da6df73540d855069c2daaa5cGerrit Renker * initialized to S.ISS (sec. 8.5) */ 455d7f7365f5776723da6df73540d855069c2daaa5cGerrit Renker dp->dccps_gar = dp->dccps_iss; 456d7f7365f5776723da6df73540d855069c2daaa5cGerrit Renker 4577c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo icsk->icsk_retransmits = 0; 45897e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald init_timer(&dp->dccps_xmit_timer); 45997e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dp->dccps_xmit_timer.data = (unsigned long)sk; 46097e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dp->dccps_xmit_timer.function = dccp_write_xmit_timer; 4617c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 4627c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4637c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Meloint dccp_connect(struct sock *sk) 4647c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 4657c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct sk_buff *skb; 4667c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct inet_connection_sock *icsk = inet_csk(sk); 4677c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4687c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_connect_init(sk); 4697c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 470118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo skb = alloc_skb(sk->sk_prot->max_header, sk->sk_allocation); 4717c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (unlikely(skb == NULL)) 4727c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return -ENOBUFS; 4737c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4747c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Reserve space for headers. */ 475118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo skb_reserve(skb, sk->sk_prot->max_header); 4767c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4777c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_REQUEST; 4787c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 47948918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu dccp_skb_entail(sk, skb); 4807c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_transmit_skb(sk, skb_clone(skb, GFP_KERNEL)); 4817c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_INC_STATS(DCCP_MIB_ACTIVEOPENS); 4827c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4837c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Timer for repeating the REQUEST until an answer. */ 48427258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, 48527258ee54f8cd4a43d09319aa5448145afc2cb8dArnaldo Carvalho de Melo icsk->icsk_rto, DCCP_RTO_MAX); 4867c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return 0; 4877c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 4887c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 489f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(dccp_connect); 490f21e68caa0ddffddf98a1e729e734a470957b6ecArnaldo Carvalho de Melo 4917c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melovoid dccp_send_ack(struct sock *sk) 4927c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 4937c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* If we have been reset, we may not send again. */ 4947c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (sk->sk_state != DCCP_CLOSED) { 495118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo struct sk_buff *skb = alloc_skb(sk->sk_prot->max_header, 496118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo GFP_ATOMIC); 4977c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 4987c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (skb == NULL) { 4997c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo inet_csk_schedule_ack(sk); 5007c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo inet_csk(sk)->icsk_ack.ato = TCP_ATO_MIN; 5017690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, 5027690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo TCP_DELACK_MAX, 5037690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo DCCP_RTO_MAX); 5047c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return; 5057c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 5067c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5077c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Reserve space for headers */ 508118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo skb_reserve(skb, sk->sk_prot->max_header); 5097c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_ACK; 5107c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_transmit_skb(sk, skb); 5117c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 5127c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 5137c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5147c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(dccp_send_ack); 5157c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5167c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melovoid dccp_send_delayed_ack(struct sock *sk) 5177c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 5187c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct inet_connection_sock *icsk = inet_csk(sk); 5197c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* 5207c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * FIXME: tune this timer. elapsed time fixes the skew, so no problem 5217c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * with using 2s, and active senders also piggyback the ACK into a 5227c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * DATAACK packet, so this is really for quiescent senders. 5237c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 5247c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo unsigned long timeout = jiffies + 2 * HZ; 5257c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5267c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Use new timeout only if there wasn't a older one earlier. */ 5277c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (icsk->icsk_ack.pending & ICSK_ACK_TIMER) { 5287c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* If delack timer was blocked or is about to expire, 5297c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * send ACK now. 5307c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * 5317c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * FIXME: check the "about to expire" part 5327c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 5337c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (icsk->icsk_ack.blocked) { 5347c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_send_ack(sk); 5357c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return; 5367c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 5377c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5387c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (!time_before(timeout, icsk->icsk_ack.timeout)) 5397c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo timeout = icsk->icsk_ack.timeout; 5407c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo } 5417c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo icsk->icsk_ack.pending |= ICSK_ACK_SCHED | ICSK_ACK_TIMER; 5427c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo icsk->icsk_ack.timeout = timeout; 5437c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo sk_reset_timer(sk, &icsk->icsk_delack_timer, timeout); 5447c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 5457c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 546e92ae93a8aa66aea12935420cb22d4df1c18d023Arnaldo Carvalho de Melovoid dccp_send_sync(struct sock *sk, const u64 seq, 547e92ae93a8aa66aea12935420cb22d4df1c18d023Arnaldo Carvalho de Melo const enum dccp_pkt_type pkt_type) 5487c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 5497c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* 5507c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * We are not putting this on the write queue, so 5517c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * dccp_transmit_skb() will set the ownership to this 5527c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo * sock. 5537c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 554118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo struct sk_buff *skb = alloc_skb(sk->sk_prot->max_header, GFP_ATOMIC); 5557c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5567c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo if (skb == NULL) 5577c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* FIXME: how to make sure the sync is sent? */ 5587c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo return; 5597c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5607c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Reserve space for headers and prepare control bits. */ 561118b2c9532c853ebdf15c21128d30a343b89ea45Arnaldo Carvalho de Melo skb_reserve(skb, sk->sk_prot->max_header); 562e92ae93a8aa66aea12935420cb22d4df1c18d023Arnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type = pkt_type; 5637c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_seq = seq; 5647c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5657c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo dccp_transmit_skb(sk, skb); 5667c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 5677c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 568b61fafc4ef3faf54236d57e3b230ca19167663bfArnaldo Carvalho de MeloEXPORT_SYMBOL_GPL(dccp_send_sync); 569b61fafc4ef3faf54236d57e3b230ca19167663bfArnaldo Carvalho de Melo 5707690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo/* 5717690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo * Send a DCCP_PKT_CLOSE/CLOSEREQ. The caller locks the socket for us. This 5727690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo * cannot be allowed to fail queueing a DCCP_PKT_CLOSE/CLOSEREQ frame under 5737690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo * any circumstances. 5747c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo */ 5757ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melovoid dccp_send_close(struct sock *sk, const int active) 5767c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo{ 5777c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 5787c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo struct sk_buff *skb; 5797d877f3bda870ab5f001bd92528654471d5966b3Al Viro const gfp_t prio = active ? GFP_KERNEL : GFP_ATOMIC; 5807c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5817ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo skb = alloc_skb(sk->sk_prot->max_header, prio); 5827ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo if (skb == NULL) 5837ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo return; 5847c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5857c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo /* Reserve space for headers and prepare control bits. */ 5867c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo skb_reserve(skb, sk->sk_prot->max_header); 5877690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type = dp->dccps_role == DCCP_ROLE_CLIENT ? 5887690af3fff7633e40b1b9950eb8489129251d074Arnaldo Carvalho de Melo DCCP_PKT_CLOSE : DCCP_PKT_CLOSEREQ; 5897c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo 5907ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo if (active) { 59197e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald dccp_write_xmit(sk, 1); 59248918a4dbd6c599d6af30bd64cb355fadca708ebHerbert Xu dccp_skb_entail(sk, skb); 5937ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo dccp_transmit_skb(sk, skb_clone(skb, prio)); 59497e5848dd39e7e76bd6077735ebb5473763ab9c5Ian McDonald /* FIXME do we need a retransmit timer here? */ 5957ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo } else 5967ad07e7cf343181002c10c39d3f57a88e4903d4fArnaldo Carvalho de Melo dccp_transmit_skb(sk, skb); 5977c657876b63cb1d8a2ec06f8fc6c37bb8412e66cArnaldo Carvalho de Melo} 598