Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | #ifndef _DCCP_H |
| 2 | #define _DCCP_H |
| 3 | /* |
| 4 | * net/dccp/dccp.h |
| 5 | * |
| 6 | * An implementation of the DCCP protocol |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 7 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 8 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/dccp.h> |
| 16 | #include <net/snmp.h> |
| 17 | #include <net/sock.h> |
| 18 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 19 | #include "ackvec.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 20 | |
Arnaldo Carvalho de Melo | 725ba8e | 2005-08-13 20:35:39 -0300 | [diff] [blame] | 21 | #ifdef CONFIG_IP_DCCP_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 22 | extern int dccp_debug; |
| 23 | |
| 24 | #define dccp_pr_debug(format, a...) \ |
| 25 | do { if (dccp_debug) \ |
| 26 | printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \ |
| 27 | } while (0) |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 28 | #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \ |
| 29 | printk(format, ##a); } while (0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 30 | #else |
| 31 | #define dccp_pr_debug(format, a...) |
| 32 | #define dccp_pr_debug_cat(format, a...) |
| 33 | #endif |
| 34 | |
| 35 | extern struct inet_hashinfo dccp_hashinfo; |
| 36 | |
| 37 | extern atomic_t dccp_orphan_count; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 38 | |
| 39 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); |
| 40 | |
Gerrit Renker | 60361be | 2006-11-10 02:13:56 -0200 | [diff] [blame] | 41 | /* |
| 42 | * Set safe upper bounds for header and option length. Since Data Offset is 8 |
| 43 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than |
| 44 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): |
| 45 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR |
| 46 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields |
| 47 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 |
| 48 | */ |
| 49 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int)) |
| 50 | #define DCCP_MAX_PACKET_HDR 28 |
| 51 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) |
| 52 | #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 53 | |
| 54 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT |
| 55 | * state, about 60 seconds */ |
| 56 | |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 57 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 58 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
| 59 | |
| 60 | /* Maximal interval between probes for local resources. */ |
| 61 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) |
| 62 | |
| 63 | #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ |
| 64 | |
Ian McDonald | f45b3ec | 2006-11-10 13:09:10 -0200 | [diff] [blame] | 65 | #define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */ |
| 66 | |
Gerrit Renker | 2e2e9e9 | 2006-11-13 13:23:52 -0200 | [diff] [blame] | 67 | /* sysctl variables for DCCP */ |
| 68 | extern int sysctl_dccp_request_retries; |
| 69 | extern int sysctl_dccp_retries1; |
| 70 | extern int sysctl_dccp_retries2; |
Gerrit Renker | afb0a34 | 2006-11-13 13:25:41 -0200 | [diff] [blame] | 71 | extern int sysctl_dccp_feat_sequence_window; |
| 72 | extern int sysctl_dccp_feat_rx_ccid; |
| 73 | extern int sysctl_dccp_feat_tx_ccid; |
| 74 | extern int sysctl_dccp_feat_ack_ratio; |
| 75 | extern int sysctl_dccp_feat_send_ack_vector; |
| 76 | extern int sysctl_dccp_feat_send_ndp_count; |
Gerrit Renker | 2e2e9e9 | 2006-11-13 13:23:52 -0200 | [diff] [blame] | 77 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 78 | /* is seq1 < seq2 ? */ |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 79 | static inline int before48(const u64 seq1, const u64 seq2) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 80 | { |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 81 | return (s64)((seq1 << 16) - (seq2 << 16)) < 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | /* is seq1 > seq2 ? */ |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 85 | static inline int after48(const u64 seq1, const u64 seq2) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 86 | { |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 87 | return (s64)((seq2 << 16) - (seq1 << 16)) < 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | /* is seq2 <= seq1 <= seq3 ? */ |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 91 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 92 | { |
| 93 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); |
| 94 | } |
| 95 | |
| 96 | static inline u64 max48(const u64 seq1, const u64 seq2) |
| 97 | { |
| 98 | return after48(seq1, seq2) ? seq1 : seq2; |
| 99 | } |
| 100 | |
Ian McDonald | 837d107 | 2006-08-26 19:06:42 -0700 | [diff] [blame] | 101 | /* is seq1 next seqno after seq2 */ |
| 102 | static inline int follows48(const u64 seq1, const u64 seq2) |
| 103 | { |
| 104 | int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF); |
| 105 | |
| 106 | return diff==1; |
| 107 | } |
| 108 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 109 | enum { |
| 110 | DCCP_MIB_NUM = 0, |
| 111 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ |
| 112 | DCCP_MIB_ESTABRESETS, /* EstabResets */ |
| 113 | DCCP_MIB_CURRESTAB, /* CurrEstab */ |
| 114 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
| 115 | DCCP_MIB_OUTRSTS, |
| 116 | DCCP_MIB_ABORTONTIMEOUT, |
| 117 | DCCP_MIB_TIMEOUTS, |
| 118 | DCCP_MIB_ABORTFAILED, |
| 119 | DCCP_MIB_PASSIVEOPENS, |
| 120 | DCCP_MIB_ATTEMPTFAILS, |
| 121 | DCCP_MIB_OUTDATAGRAMS, |
| 122 | DCCP_MIB_INERRS, |
| 123 | DCCP_MIB_OPTMANDATORYERROR, |
| 124 | DCCP_MIB_INVALIDOPT, |
| 125 | __DCCP_MIB_MAX |
| 126 | }; |
| 127 | |
| 128 | #define DCCP_MIB_MAX __DCCP_MIB_MAX |
| 129 | struct dccp_mib { |
| 130 | unsigned long mibs[DCCP_MIB_MAX]; |
| 131 | } __SNMP_MIB_ALIGN__; |
| 132 | |
| 133 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 134 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
| 135 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) |
| 136 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) |
| 137 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
| 138 | #define DCCP_ADD_STATS_BH(field, val) \ |
| 139 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) |
| 140 | #define DCCP_ADD_STATS_USER(field, val) \ |
| 141 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 142 | |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 143 | /* |
| 144 | * Checksumming routines |
| 145 | */ |
| 146 | static inline int dccp_csum_coverage(const struct sk_buff *skb) |
| 147 | { |
| 148 | const struct dccp_hdr* dh = dccp_hdr(skb); |
| 149 | |
| 150 | if (dh->dccph_cscov == 0) |
| 151 | return skb->len; |
| 152 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); |
| 153 | } |
| 154 | |
| 155 | static inline void dccp_csum_outgoing(struct sk_buff *skb) |
| 156 | { |
| 157 | int cov = dccp_csum_coverage(skb); |
| 158 | |
| 159 | if (cov >= skb->len) |
| 160 | dccp_hdr(skb)->dccph_cscov = 0; |
| 161 | |
| 162 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); |
| 163 | } |
| 164 | |
| 165 | extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); |
| 166 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 167 | extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); |
| 168 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 169 | extern void dccp_send_ack(struct sock *sk); |
| 170 | extern void dccp_send_delayed_ack(struct sock *sk); |
Gerrit Renker | 8a73cd0 | 2006-11-10 12:32:01 -0200 | [diff] [blame] | 171 | extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk); |
| 172 | |
Arnaldo Carvalho de Melo | e92ae93 | 2005-08-17 03:10:59 -0300 | [diff] [blame] | 173 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
| 174 | const enum dccp_pkt_type pkt_type); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 175 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 176 | extern void dccp_write_xmit(struct sock *sk, int block); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 177 | extern void dccp_write_space(struct sock *sk); |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 178 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 179 | extern void dccp_init_xmit_timers(struct sock *sk); |
| 180 | static inline void dccp_clear_xmit_timers(struct sock *sk) |
| 181 | { |
| 182 | inet_csk_clear_xmit_timers(sk); |
| 183 | } |
| 184 | |
| 185 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); |
| 186 | |
| 187 | extern const char *dccp_packet_name(const int type); |
| 188 | extern const char *dccp_state_name(const int state); |
| 189 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 190 | extern void dccp_set_state(struct sock *sk, const int state); |
| 191 | extern void dccp_done(struct sock *sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 192 | |
Gerrit Renker | cf55792 | 2006-11-10 16:08:37 -0200 | [diff] [blame] | 193 | extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 194 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 195 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
| 196 | |
| 197 | extern struct sock *dccp_create_openreq_child(struct sock *sk, |
| 198 | const struct request_sock *req, |
| 199 | const struct sk_buff *skb); |
| 200 | |
| 201 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); |
| 202 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 203 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
| 204 | struct sk_buff *skb, |
| 205 | struct request_sock *req, |
| 206 | struct dst_entry *dst); |
| 207 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, |
| 208 | struct request_sock *req, |
| 209 | struct request_sock **prev); |
| 210 | |
| 211 | extern int dccp_child_process(struct sock *parent, struct sock *child, |
| 212 | struct sk_buff *skb); |
| 213 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, |
| 214 | struct dccp_hdr *dh, unsigned len); |
| 215 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, |
| 216 | const struct dccp_hdr *dh, const unsigned len); |
| 217 | |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 218 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
Arnaldo Carvalho de Melo | 3e0fadc | 2006-03-20 21:23:15 -0800 | [diff] [blame] | 219 | extern int dccp_destroy_sock(struct sock *sk); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 220 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 221 | extern void dccp_close(struct sock *sk, long timeout); |
| 222 | extern struct sk_buff *dccp_make_response(struct sock *sk, |
| 223 | struct dst_entry *dst, |
| 224 | struct request_sock *req); |
| 225 | |
| 226 | extern int dccp_connect(struct sock *sk); |
| 227 | extern int dccp_disconnect(struct sock *sk, int flags); |
Arnaldo Carvalho de Melo | c985ed7 | 2006-03-20 21:23:39 -0800 | [diff] [blame] | 228 | extern void dccp_hash(struct sock *sk); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 229 | extern void dccp_unhash(struct sock *sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 230 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, |
Arnaldo Carvalho de Melo | a1d3a35 | 2005-08-13 22:42:25 -0300 | [diff] [blame] | 231 | char __user *optval, int __user *optlen); |
| 232 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, |
| 233 | char __user *optval, int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 234 | #ifdef CONFIG_COMPAT |
| 235 | extern int compat_dccp_getsockopt(struct sock *sk, |
| 236 | int level, int optname, |
| 237 | char __user *optval, int __user *optlen); |
| 238 | extern int compat_dccp_setsockopt(struct sock *sk, |
| 239 | int level, int optname, |
| 240 | char __user *optval, int optlen); |
| 241 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 242 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 243 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
| 244 | struct msghdr *msg, size_t size); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 245 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
| 246 | struct msghdr *msg, size_t len, int nonblock, |
| 247 | int flags, int *addr_len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 248 | extern void dccp_shutdown(struct sock *sk, int how); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 249 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
| 250 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, |
| 251 | poll_table *wait); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 252 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
| 253 | int addr_len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 254 | |
Arnaldo Carvalho de Melo | 017487d | 2006-03-20 19:25:24 -0800 | [diff] [blame] | 255 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
Arnaldo Carvalho de Melo | 7ad07e7 | 2005-08-23 21:50:06 -0700 | [diff] [blame] | 256 | extern void dccp_send_close(struct sock *sk, const int active); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 257 | extern int dccp_invalid_packet(struct sk_buff *skb); |
| 258 | |
| 259 | static inline int dccp_bad_service_code(const struct sock *sk, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 260 | const __be32 service) |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 261 | { |
| 262 | const struct dccp_sock *dp = dccp_sk(sk); |
| 263 | |
| 264 | if (dp->dccps_service == service) |
| 265 | return 0; |
| 266 | return !dccp_list_has_service(dp->dccps_service_list, service); |
| 267 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 268 | |
| 269 | struct dccp_skb_cb { |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 270 | __u8 dccpd_type:4; |
| 271 | __u8 dccpd_ccval:4; |
| 272 | __u8 dccpd_reset_code; |
| 273 | __u16 dccpd_opt_len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 274 | __u64 dccpd_seq; |
| 275 | __u64 dccpd_ack_seq; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 276 | }; |
| 277 | |
| 278 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) |
| 279 | |
| 280 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
| 281 | { |
| 282 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 283 | |
| 284 | return type == DCCP_PKT_ACK || |
| 285 | type == DCCP_PKT_CLOSE || |
| 286 | type == DCCP_PKT_CLOSEREQ || |
| 287 | type == DCCP_PKT_RESET || |
| 288 | type == DCCP_PKT_SYNC || |
| 289 | type == DCCP_PKT_SYNCACK; |
| 290 | } |
| 291 | |
| 292 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
| 293 | { |
| 294 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 295 | |
| 296 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; |
| 297 | } |
| 298 | |
| 299 | #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) |
| 300 | #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) |
| 301 | |
| 302 | static inline void dccp_set_seqno(u64 *seqno, u64 value) |
| 303 | { |
| 304 | if (value > DCCP_MAX_SEQNO) |
| 305 | value -= DCCP_MAX_SEQNO + 1; |
| 306 | *seqno = value; |
| 307 | } |
| 308 | |
| 309 | static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) |
| 310 | { |
| 311 | return ((seqno2 << 16) - (seqno1 << 16)) >> 16; |
| 312 | } |
| 313 | |
| 314 | static inline void dccp_inc_seqno(u64 *seqno) |
| 315 | { |
| 316 | if (++*seqno > DCCP_MAX_SEQNO) |
| 317 | *seqno = 0; |
| 318 | } |
| 319 | |
| 320 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) |
| 321 | { |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 322 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
| 323 | sizeof(*dh)); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 324 | dh->dccph_seq2 = 0; |
| 325 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 326 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
| 327 | } |
| 328 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 329 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
| 330 | const u64 gsr) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 331 | { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 332 | dhack->dccph_reserved1 = 0; |
| 333 | dhack->dccph_ack_nr_high = htons(gsr >> 32); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 334 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
| 335 | } |
| 336 | |
| 337 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) |
| 338 | { |
| 339 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 340 | const struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 341 | |
Arnaldo Carvalho de Melo | 03ace39 | 2005-08-21 05:36:45 -0300 | [diff] [blame] | 342 | dp->dccps_gsr = seq; |
| 343 | dccp_set_seqno(&dp->dccps_swl, |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 344 | dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 345 | dccp_set_seqno(&dp->dccps_swh, |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 346 | dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | static inline void dccp_update_gss(struct sock *sk, u64 seq) |
| 350 | { |
| 351 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 352 | |
Arnaldo Carvalho de Melo | 03ace39 | 2005-08-21 05:36:45 -0300 | [diff] [blame] | 353 | dp->dccps_awh = dp->dccps_gss = seq; |
| 354 | dccp_set_seqno(&dp->dccps_awl, |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 355 | (dp->dccps_gss - |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 356 | dccp_msk(sk)->dccpms_sequence_window + 1)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 357 | } |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 358 | |
| 359 | static inline int dccp_ack_pending(const struct sock *sk) |
| 360 | { |
| 361 | const struct dccp_sock *dp = dccp_sk(sk); |
| 362 | return dp->dccps_timestamp_echo != 0 || |
| 363 | #ifdef CONFIG_IP_DCCP_ACKVEC |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 364 | (dccp_msk(sk)->dccpms_send_ack_vector && |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 365 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
| 366 | #endif |
| 367 | inet_csk_ack_scheduled(sk); |
| 368 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 369 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 370 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
| 371 | extern int dccp_insert_option_elapsed_time(struct sock *sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 372 | struct sk_buff *skb, |
| 373 | u32 elapsed_time); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 374 | extern int dccp_insert_option_timestamp(struct sock *sk, |
Arnaldo Carvalho de Melo | d4b81ff | 2005-08-23 21:51:36 -0700 | [diff] [blame] | 375 | struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 376 | extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 377 | unsigned char option, |
| 378 | const void *value, unsigned char len); |
| 379 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 380 | extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); |
| 381 | |
Arnaldo Carvalho de Melo | b6ee3d4 | 2005-08-27 18:18:18 -0300 | [diff] [blame] | 382 | static inline suseconds_t timeval_usecs(const struct timeval *tv) |
| 383 | { |
| 384 | return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; |
| 385 | } |
| 386 | |
| 387 | static inline suseconds_t timeval_delta(const struct timeval *large, |
| 388 | const struct timeval *small) |
| 389 | { |
| 390 | time_t secs = large->tv_sec - small->tv_sec; |
| 391 | suseconds_t usecs = large->tv_usec - small->tv_usec; |
| 392 | |
| 393 | if (usecs < 0) { |
| 394 | secs--; |
| 395 | usecs += USEC_PER_SEC; |
| 396 | } |
| 397 | return secs * USEC_PER_SEC + usecs; |
| 398 | } |
| 399 | |
| 400 | static inline void timeval_add_usecs(struct timeval *tv, |
| 401 | const suseconds_t usecs) |
| 402 | { |
| 403 | tv->tv_usec += usecs; |
| 404 | while (tv->tv_usec >= USEC_PER_SEC) { |
| 405 | tv->tv_sec++; |
| 406 | tv->tv_usec -= USEC_PER_SEC; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | static inline void timeval_sub_usecs(struct timeval *tv, |
| 411 | const suseconds_t usecs) |
| 412 | { |
| 413 | tv->tv_usec -= usecs; |
| 414 | while (tv->tv_usec < 0) { |
| 415 | tv->tv_sec--; |
| 416 | tv->tv_usec += USEC_PER_SEC; |
| 417 | } |
| 418 | } |
| 419 | |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 420 | #ifdef CONFIG_SYSCTL |
| 421 | extern int dccp_sysctl_init(void); |
| 422 | extern void dccp_sysctl_exit(void); |
| 423 | #else |
| 424 | static inline int dccp_sysctl_init(void) |
| 425 | { |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | static inline void dccp_sysctl_exit(void) |
| 430 | { |
| 431 | } |
| 432 | #endif |
| 433 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 434 | #endif /* _DCCP_H */ |