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> |
Arnaldo Carvalho de Melo | 9823b7b | 2007-08-19 17:16:35 -0700 | [diff] [blame] | 16 | #include <linux/ktime.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 17 | #include <net/snmp.h> |
| 18 | #include <net/sock.h> |
| 19 | #include <net/tcp.h> |
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 | |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 22 | /* |
| 23 | * DCCP - specific warning and debugging macros. |
| 24 | */ |
| 25 | #define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 26 | __func__, ##a) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 27 | #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 28 | __FILE__, __LINE__, __func__) |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 29 | #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0) |
| 30 | #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \ |
| 31 | DCCP_BUG("\"%s\" holds (exception!)", \ |
| 32 | __stringify(cond)); \ |
Gerrit Renker | 3c69526 | 2006-11-15 21:27:47 -0200 | [diff] [blame] | 33 | } while (0) |
| 34 | |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 35 | #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ |
| 36 | printk(fmt, ##args); \ |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 37 | } while(0) |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 38 | #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \ |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 39 | "%s: " fmt, __func__, ##a) |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 40 | |
Arnaldo Carvalho de Melo | 725ba8e | 2005-08-13 20:35:39 -0300 | [diff] [blame] | 41 | #ifdef CONFIG_IP_DCCP_DEBUG |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 42 | extern int dccp_debug; |
Gerrit Renker | 8411671 | 2006-11-20 18:26:03 -0200 | [diff] [blame] | 43 | #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a) |
| 44 | #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 45 | #else |
| 46 | #define dccp_pr_debug(format, a...) |
| 47 | #define dccp_pr_debug_cat(format, a...) |
| 48 | #endif |
| 49 | |
| 50 | extern struct inet_hashinfo dccp_hashinfo; |
| 51 | |
| 52 | extern atomic_t dccp_orphan_count; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 53 | |
| 54 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); |
| 55 | |
Gerrit Renker | 60361be | 2006-11-10 02:13:56 -0200 | [diff] [blame] | 56 | /* |
| 57 | * Set safe upper bounds for header and option length. Since Data Offset is 8 |
| 58 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than |
| 59 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): |
| 60 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR |
| 61 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields |
| 62 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 |
| 63 | */ |
| 64 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int)) |
| 65 | #define DCCP_MAX_PACKET_HDR 28 |
| 66 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) |
| 67 | #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 68 | |
| 69 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT |
| 70 | * state, about 60 seconds */ |
| 71 | |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 72 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 73 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
| 74 | |
Gerrit Renker | 28be544 | 2007-12-13 12:16:23 -0200 | [diff] [blame] | 75 | /* |
| 76 | * The maximum back-off value for retransmissions. This is needed for |
| 77 | * - retransmitting client-Requests (sec. 8.1.1), |
| 78 | * - retransmitting Close/CloseReq when closing (sec. 8.3), |
| 79 | * - feature-negotiation retransmission (sec. 6.6.3), |
| 80 | * - Acks in client-PARTOPEN state (sec. 8.1.5). |
| 81 | */ |
| 82 | #define DCCP_RTO_MAX ((unsigned)(64 * HZ)) |
Gerrit Renker | 4712a79 | 2007-03-20 15:23:18 -0300 | [diff] [blame] | 83 | |
Gerrit Renker | 954c2db | 2007-12-12 14:06:14 -0200 | [diff] [blame] | 84 | /* |
| 85 | * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 |
| 86 | */ |
Gerrit Renker | 4712a79 | 2007-03-20 15:23:18 -0300 | [diff] [blame] | 87 | #define DCCP_SANE_RTT_MIN 100 |
Gerrit Renker | 954c2db | 2007-12-12 14:06:14 -0200 | [diff] [blame] | 88 | #define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) |
| 89 | #define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC) |
Gerrit Renker | 4712a79 | 2007-03-20 15:23:18 -0300 | [diff] [blame] | 90 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 91 | /* Maximal interval between probes for local resources. */ |
| 92 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) |
| 93 | |
Gerrit Renker | 2e2e9e9 | 2006-11-13 13:23:52 -0200 | [diff] [blame] | 94 | /* sysctl variables for DCCP */ |
| 95 | extern int sysctl_dccp_request_retries; |
| 96 | extern int sysctl_dccp_retries1; |
| 97 | extern int sysctl_dccp_retries2; |
Gerrit Renker | afb0a34 | 2006-11-13 13:25:41 -0200 | [diff] [blame] | 98 | extern int sysctl_dccp_feat_sequence_window; |
| 99 | extern int sysctl_dccp_feat_rx_ccid; |
| 100 | extern int sysctl_dccp_feat_tx_ccid; |
| 101 | extern int sysctl_dccp_feat_ack_ratio; |
| 102 | extern int sysctl_dccp_feat_send_ack_vector; |
| 103 | extern int sysctl_dccp_feat_send_ndp_count; |
Ian McDonald | b1308dc | 2006-11-20 18:30:17 -0200 | [diff] [blame] | 104 | extern int sysctl_dccp_tx_qlen; |
Gerrit Renker | a94f0f9 | 2007-09-26 11:31:49 -0300 | [diff] [blame] | 105 | extern int sysctl_dccp_sync_ratelimit; |
Gerrit Renker | 2e2e9e9 | 2006-11-13 13:23:52 -0200 | [diff] [blame] | 106 | |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 107 | /* |
| 108 | * 48-bit sequence number arithmetic (signed and unsigned) |
| 109 | */ |
| 110 | #define INT48_MIN 0x800000000000LL /* 2^47 */ |
| 111 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ |
| 112 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */ |
| 113 | #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x))) |
| 114 | #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x))) |
| 115 | #define ADD48(a, b) (((a) + (b)) & UINT48_MAX) |
| 116 | #define SUB48(a, b) ADD48((a), COMPLEMENT48(b)) |
| 117 | |
| 118 | static inline void dccp_set_seqno(u64 *seqno, u64 value) |
| 119 | { |
| 120 | *seqno = value & UINT48_MAX; |
| 121 | } |
| 122 | |
| 123 | static inline void dccp_inc_seqno(u64 *seqno) |
| 124 | { |
| 125 | *seqno = ADD48(*seqno, 1); |
| 126 | } |
| 127 | |
Gerrit Renker | 0aec51c | 2007-03-20 12:45:59 -0300 | [diff] [blame] | 128 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ |
| 129 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 130 | { |
Gerrit Renker | 0aec51c | 2007-03-20 12:45:59 -0300 | [diff] [blame] | 131 | u64 delta = SUB48(seqno2, seqno1); |
| 132 | |
| 133 | return TO_SIGNED48(delta); |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 134 | } |
| 135 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 136 | /* is seq1 < seq2 ? */ |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 137 | static inline int before48(const u64 seq1, const u64 seq2) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 138 | { |
Gerrit Renker | d52de17 | 2007-03-20 13:00:26 -0300 | [diff] [blame] | 139 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | /* is seq1 > seq2 ? */ |
Gerrit Renker | d52de17 | 2007-03-20 13:00:26 -0300 | [diff] [blame] | 143 | #define after48(seq1, seq2) before48(seq2, seq1) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 144 | |
| 145 | /* is seq2 <= seq1 <= seq3 ? */ |
Patrick McHardy | a10cedd | 2005-08-14 21:05:53 -0300 | [diff] [blame] | 146 | 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] | 147 | { |
| 148 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); |
| 149 | } |
| 150 | |
| 151 | static inline u64 max48(const u64 seq1, const u64 seq2) |
| 152 | { |
| 153 | return after48(seq1, seq2) ? seq1 : seq2; |
| 154 | } |
| 155 | |
Gerrit Renker | 2013c7e | 2008-07-13 11:51:40 +0100 | [diff] [blame] | 156 | /** |
| 157 | * dccp_loss_free - Evaluates condition for data loss from RFC 4340, 7.7.1 |
| 158 | * @s1: start sequence number |
| 159 | * @s2: end sequence number |
| 160 | * @ndp: NDP count on packet with sequence number @s2 |
| 161 | * Returns true if the sequence range s1...s2 has no data loss. |
| 162 | */ |
| 163 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) |
| 164 | { |
| 165 | s64 delta = dccp_delta_seqno(s1, s2); |
| 166 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 167 | WARN_ON(delta < 0); |
Gerrit Renker | 2013c7e | 2008-07-13 11:51:40 +0100 | [diff] [blame] | 168 | return (u64)delta <= ndp + 1; |
| 169 | } |
| 170 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 171 | enum { |
| 172 | DCCP_MIB_NUM = 0, |
| 173 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ |
| 174 | DCCP_MIB_ESTABRESETS, /* EstabResets */ |
| 175 | DCCP_MIB_CURRESTAB, /* CurrEstab */ |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 176 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 177 | DCCP_MIB_OUTRSTS, |
| 178 | DCCP_MIB_ABORTONTIMEOUT, |
| 179 | DCCP_MIB_TIMEOUTS, |
| 180 | DCCP_MIB_ABORTFAILED, |
| 181 | DCCP_MIB_PASSIVEOPENS, |
| 182 | DCCP_MIB_ATTEMPTFAILS, |
| 183 | DCCP_MIB_OUTDATAGRAMS, |
| 184 | DCCP_MIB_INERRS, |
| 185 | DCCP_MIB_OPTMANDATORYERROR, |
| 186 | DCCP_MIB_INVALIDOPT, |
| 187 | __DCCP_MIB_MAX |
| 188 | }; |
| 189 | |
| 190 | #define DCCP_MIB_MAX __DCCP_MIB_MAX |
| 191 | struct dccp_mib { |
| 192 | unsigned long mibs[DCCP_MIB_MAX]; |
| 193 | } __SNMP_MIB_ALIGN__; |
| 194 | |
| 195 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 196 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
| 197 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) |
| 198 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) |
| 199 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
| 200 | #define DCCP_ADD_STATS_BH(field, val) \ |
| 201 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) |
| 202 | #define DCCP_ADD_STATS_USER(field, val) \ |
| 203 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 204 | |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 205 | /* |
| 206 | * Checksumming routines |
| 207 | */ |
Ian McDonald | e961811 | 2007-05-28 16:32:26 -0300 | [diff] [blame] | 208 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 209 | { |
| 210 | const struct dccp_hdr* dh = dccp_hdr(skb); |
| 211 | |
| 212 | if (dh->dccph_cscov == 0) |
| 213 | return skb->len; |
| 214 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); |
| 215 | } |
| 216 | |
| 217 | static inline void dccp_csum_outgoing(struct sk_buff *skb) |
| 218 | { |
Ian McDonald | e961811 | 2007-05-28 16:32:26 -0300 | [diff] [blame] | 219 | unsigned int cov = dccp_csum_coverage(skb); |
Gerrit Renker | 6f4e5ff | 2006-11-10 17:43:06 -0200 | [diff] [blame] | 220 | |
| 221 | if (cov >= skb->len) |
| 222 | dccp_hdr(skb)->dccph_cscov = 0; |
| 223 | |
| 224 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); |
| 225 | } |
| 226 | |
| 227 | extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); |
| 228 | |
Gerrit Renker | 5943544 | 2008-07-26 11:59:09 +0100 | [diff] [blame] | 229 | extern int dccp_retransmit_skb(struct sock *sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 230 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 231 | extern void dccp_send_ack(struct sock *sk); |
Gui Jianfeng | 6edafaa | 2008-08-06 23:50:04 -0700 | [diff] [blame] | 232 | extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
| 233 | struct request_sock *rsk); |
Gerrit Renker | 8a73cd0 | 2006-11-10 12:32:01 -0200 | [diff] [blame] | 234 | |
Arnaldo Carvalho de Melo | e92ae93 | 2005-08-17 03:10:59 -0300 | [diff] [blame] | 235 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
| 236 | const enum dccp_pkt_type pkt_type); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 237 | |
Ian McDonald | 97e5848 | 2006-08-26 19:16:45 -0700 | [diff] [blame] | 238 | extern void dccp_write_xmit(struct sock *sk, int block); |
Arnaldo Carvalho de Melo | c530cfb | 2005-08-29 02:15:54 -0300 | [diff] [blame] | 239 | extern void dccp_write_space(struct sock *sk); |
Arnaldo Carvalho de Melo | 27258ee | 2005-08-09 20:30:56 -0700 | [diff] [blame] | 240 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 241 | extern void dccp_init_xmit_timers(struct sock *sk); |
| 242 | static inline void dccp_clear_xmit_timers(struct sock *sk) |
| 243 | { |
| 244 | inet_csk_clear_xmit_timers(sk); |
| 245 | } |
| 246 | |
| 247 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); |
| 248 | |
| 249 | extern const char *dccp_packet_name(const int type); |
| 250 | extern const char *dccp_state_name(const int state); |
| 251 | |
Arnaldo Carvalho de Melo | c25a18b | 2006-03-20 21:58:56 -0800 | [diff] [blame] | 252 | extern void dccp_set_state(struct sock *sk, const int state); |
| 253 | extern void dccp_done(struct sock *sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 254 | |
Gerrit Renker | cf55792 | 2006-11-10 16:08:37 -0200 | [diff] [blame] | 255 | 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] | 256 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 257 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
| 258 | |
| 259 | extern struct sock *dccp_create_openreq_child(struct sock *sk, |
| 260 | const struct request_sock *req, |
| 261 | const struct sk_buff *skb); |
| 262 | |
| 263 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); |
| 264 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 265 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
| 266 | struct sk_buff *skb, |
| 267 | struct request_sock *req, |
| 268 | struct dst_entry *dst); |
| 269 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, |
| 270 | struct request_sock *req, |
| 271 | struct request_sock **prev); |
| 272 | |
| 273 | extern int dccp_child_process(struct sock *parent, struct sock *child, |
| 274 | struct sk_buff *skb); |
| 275 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, |
| 276 | struct dccp_hdr *dh, unsigned len); |
| 277 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, |
| 278 | const struct dccp_hdr *dh, const unsigned len); |
| 279 | |
Arnaldo Carvalho de Melo | 7247887 | 2006-03-20 22:00:37 -0800 | [diff] [blame] | 280 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 281 | extern void dccp_destroy_sock(struct sock *sk); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 282 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 283 | extern void dccp_close(struct sock *sk, long timeout); |
| 284 | extern struct sk_buff *dccp_make_response(struct sock *sk, |
| 285 | struct dst_entry *dst, |
| 286 | struct request_sock *req); |
| 287 | |
| 288 | extern int dccp_connect(struct sock *sk); |
| 289 | extern int dccp_disconnect(struct sock *sk, int flags); |
| 290 | 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] | 291 | char __user *optval, int __user *optlen); |
| 292 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, |
| 293 | char __user *optval, int optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 294 | #ifdef CONFIG_COMPAT |
| 295 | extern int compat_dccp_getsockopt(struct sock *sk, |
| 296 | int level, int optname, |
| 297 | char __user *optval, int __user *optlen); |
| 298 | extern int compat_dccp_setsockopt(struct sock *sk, |
| 299 | int level, int optname, |
| 300 | char __user *optval, int optlen); |
| 301 | #endif |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 302 | 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] | 303 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
| 304 | struct msghdr *msg, size_t size); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 305 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
| 306 | struct msghdr *msg, size_t len, int nonblock, |
| 307 | int flags, int *addr_len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 308 | extern void dccp_shutdown(struct sock *sk, int how); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 309 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
| 310 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, |
| 311 | poll_table *wait); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 312 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
| 313 | int addr_len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 314 | |
Denis V. Lunev | 7630f02 | 2008-04-03 14:20:52 -0700 | [diff] [blame] | 315 | extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk, |
Gerrit Renker | e356d37 | 2007-09-26 14:35:19 -0300 | [diff] [blame] | 316 | struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 017487d | 2006-03-20 19:25:24 -0800 | [diff] [blame] | 317 | 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] | 318 | 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] | 319 | extern int dccp_invalid_packet(struct sk_buff *skb); |
Gerrit Renker | 3393da8 | 2007-09-25 22:40:44 -0700 | [diff] [blame] | 320 | extern u32 dccp_sample_rtt(struct sock *sk, long delta); |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 321 | |
| 322 | static inline int dccp_bad_service_code(const struct sock *sk, |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 323 | const __be32 service) |
Arnaldo Carvalho de Melo | f21e68c | 2005-12-13 23:24:16 -0800 | [diff] [blame] | 324 | { |
| 325 | const struct dccp_sock *dp = dccp_sk(sk); |
| 326 | |
| 327 | if (dp->dccps_service == service) |
| 328 | return 0; |
| 329 | return !dccp_list_has_service(dp->dccps_service_list, service); |
| 330 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 331 | |
Gerrit Renker | 0430ee3 | 2007-09-26 11:27:56 -0300 | [diff] [blame] | 332 | /** |
| 333 | * dccp_skb_cb - DCCP per-packet control information |
| 334 | * @dccpd_type: one of %dccp_pkt_type (or unknown) |
| 335 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 |
| 336 | * @dccpd_reset_code: one of %dccp_reset_codes |
| 337 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) |
| 338 | * @dccpd_opt_len: total length of all options (5.8) in the packet |
| 339 | * @dccpd_seq: sequence number |
| 340 | * @dccpd_ack_seq: acknowledgment number subheader field value |
| 341 | * This is used for transmission as well as for reception. |
| 342 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 343 | struct dccp_skb_cb { |
Patrick McHardy | 028b027 | 2008-04-12 18:35:41 -0700 | [diff] [blame] | 344 | union { |
| 345 | struct inet_skb_parm h4; |
| 346 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) |
| 347 | struct inet6_skb_parm h6; |
| 348 | #endif |
| 349 | } header; |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 350 | __u8 dccpd_type:4; |
| 351 | __u8 dccpd_ccval:4; |
Gerrit Renker | 0430ee3 | 2007-09-26 11:27:56 -0300 | [diff] [blame] | 352 | __u8 dccpd_reset_code, |
| 353 | dccpd_reset_data[3]; |
Arnaldo Carvalho de Melo | 67e6b62 | 2005-09-16 16:58:40 -0700 | [diff] [blame] | 354 | __u16 dccpd_opt_len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 355 | __u64 dccpd_seq; |
| 356 | __u64 dccpd_ack_seq; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 357 | }; |
| 358 | |
| 359 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) |
| 360 | |
Gerrit Renker | 2180c41 | 2007-12-06 12:27:15 -0200 | [diff] [blame] | 361 | /* RFC 4340, sec. 7.7 */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 362 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
| 363 | { |
| 364 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 365 | |
| 366 | return type == DCCP_PKT_ACK || |
| 367 | type == DCCP_PKT_CLOSE || |
| 368 | type == DCCP_PKT_CLOSEREQ || |
| 369 | type == DCCP_PKT_RESET || |
| 370 | type == DCCP_PKT_SYNC || |
| 371 | type == DCCP_PKT_SYNCACK; |
| 372 | } |
| 373 | |
Gerrit Renker | 2180c41 | 2007-12-06 12:27:15 -0200 | [diff] [blame] | 374 | /* RFC 4340, sec. 7.7 */ |
| 375 | static inline int dccp_data_packet(const struct sk_buff *skb) |
| 376 | { |
| 377 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 378 | |
| 379 | return type == DCCP_PKT_DATA || |
| 380 | type == DCCP_PKT_DATAACK || |
| 381 | type == DCCP_PKT_REQUEST || |
| 382 | type == DCCP_PKT_RESPONSE; |
| 383 | } |
| 384 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 385 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
| 386 | { |
| 387 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
| 388 | |
| 389 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; |
| 390 | } |
| 391 | |
Gerrit Renker | 6b811d4 | 2007-03-20 12:26:51 -0300 | [diff] [blame] | 392 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 393 | |
| 394 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) |
| 395 | { |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 396 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
| 397 | sizeof(*dh)); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 398 | dh->dccph_seq2 = 0; |
| 399 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 400 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
| 401 | } |
| 402 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 403 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
| 404 | const u64 gsr) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 405 | { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 406 | dhack->dccph_reserved1 = 0; |
| 407 | dhack->dccph_ack_nr_high = htons(gsr >> 32); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 408 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
| 409 | } |
| 410 | |
| 411 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) |
| 412 | { |
| 413 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 414 | const struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 415 | |
Arnaldo Carvalho de Melo | 03ace39 | 2005-08-21 05:36:45 -0300 | [diff] [blame] | 416 | dp->dccps_gsr = seq; |
| 417 | dccp_set_seqno(&dp->dccps_swl, |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 418 | dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 419 | dccp_set_seqno(&dp->dccps_swh, |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 420 | dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | static inline void dccp_update_gss(struct sock *sk, u64 seq) |
| 424 | { |
| 425 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 426 | |
Arnaldo Carvalho de Melo | 03ace39 | 2005-08-21 05:36:45 -0300 | [diff] [blame] | 427 | dp->dccps_awh = dp->dccps_gss = seq; |
| 428 | dccp_set_seqno(&dp->dccps_awl, |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 429 | (dp->dccps_gss - |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 430 | dccp_msk(sk)->dccpms_sequence_window + 1)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 431 | } |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 432 | |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 433 | static inline int dccp_ack_pending(const struct sock *sk) |
| 434 | { |
| 435 | const struct dccp_sock *dp = dccp_sk(sk); |
| 436 | return dp->dccps_timestamp_echo != 0 || |
| 437 | #ifdef CONFIG_IP_DCCP_ACKVEC |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 438 | (dccp_msk(sk)->dccpms_send_ack_vector && |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 439 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
| 440 | #endif |
| 441 | inet_csk_ack_scheduled(sk); |
| 442 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 443 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 444 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
Gerrit Renker | af3b867 | 2007-12-13 12:38:11 -0200 | [diff] [blame] | 445 | extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 446 | extern int dccp_insert_option_elapsed_time(struct sock *sk, |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 447 | struct sk_buff *skb, |
| 448 | u32 elapsed_time); |
Gerrit Renker | 4c70f38 | 2007-09-25 22:40:13 -0700 | [diff] [blame] | 449 | extern u32 dccp_timestamp(void); |
| 450 | extern void dccp_timestamping_init(void); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 451 | extern int dccp_insert_option_timestamp(struct sock *sk, |
Arnaldo Carvalho de Melo | d4b81ff | 2005-08-23 21:51:36 -0700 | [diff] [blame] | 452 | struct sk_buff *skb); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 453 | 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] | 454 | unsigned char option, |
| 455 | const void *value, unsigned char len); |
| 456 | |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 457 | #ifdef CONFIG_SYSCTL |
| 458 | extern int dccp_sysctl_init(void); |
| 459 | extern void dccp_sysctl_exit(void); |
| 460 | #else |
| 461 | static inline int dccp_sysctl_init(void) |
| 462 | { |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | static inline void dccp_sysctl_exit(void) |
| 467 | { |
| 468 | } |
| 469 | #endif |
| 470 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 471 | #endif /* _DCCP_H */ |