Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/dccp/options.c |
| 3 | * |
| 4 | * An implementation of the DCCP protocol |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 5 | * Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> |
| 6 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net> |
Ian McDonald | e6bccd3 | 2006-08-26 19:01:30 -0700 | [diff] [blame] | 7 | * Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | */ |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 14 | #include <linux/dccp.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/types.h> |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 17 | #include <asm/unaligned.h> |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/skbuff.h> |
| 20 | |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 21 | #include "ackvec.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 22 | #include "ccid.h" |
| 23 | #include "dccp.h" |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 24 | #include "feat.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 25 | |
Gerrit Renker | afb0a34 | 2006-11-13 13:25:41 -0200 | [diff] [blame] | 26 | int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; |
| 27 | int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID; |
| 28 | int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID; |
| 29 | int sysctl_dccp_feat_ack_ratio = DCCPF_INITIAL_ACK_RATIO; |
| 30 | int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; |
| 31 | int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 32 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 33 | static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) |
| 34 | { |
| 35 | u32 value = 0; |
| 36 | |
| 37 | if (len > 3) |
| 38 | value += *bf++ << 24; |
| 39 | if (len > 2) |
| 40 | value += *bf++ << 16; |
| 41 | if (len > 1) |
| 42 | value += *bf++ << 8; |
| 43 | if (len > 0) |
| 44 | value += *bf; |
| 45 | |
| 46 | return value; |
| 47 | } |
| 48 | |
Gerrit Renker | 8b81941 | 2007-12-13 12:29:24 -0200 | [diff] [blame] | 49 | /** |
| 50 | * dccp_parse_options - Parse DCCP options present in @skb |
| 51 | * @sk: client|server|listening dccp socket (when @dreq != NULL) |
| 52 | * @dreq: request socket to use during connection setup, or NULL |
| 53 | */ |
| 54 | int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, |
| 55 | struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 56 | { |
| 57 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 58 | const struct dccp_hdr *dh = dccp_hdr(skb); |
| 59 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; |
Andrea Bittau | bdf13d2 | 2006-11-24 13:02:42 -0200 | [diff] [blame] | 60 | u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 61 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); |
| 62 | unsigned char *opt_ptr = options; |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 63 | const unsigned char *opt_end = (unsigned char *)dh + |
| 64 | (dh->dccph_doff * 4); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 65 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
| 66 | unsigned char opt, len; |
| 67 | unsigned char *value; |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 68 | u32 elapsed_time; |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 69 | __be32 opt_val; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 70 | int rc; |
| 71 | int mandatory = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 72 | |
| 73 | memset(opt_recv, 0, sizeof(*opt_recv)); |
| 74 | |
David S. Miller | fb95049 | 2006-03-20 22:36:01 -0800 | [diff] [blame] | 75 | opt = len = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 76 | while (opt_ptr != opt_end) { |
| 77 | opt = *opt_ptr++; |
| 78 | len = 0; |
| 79 | value = NULL; |
| 80 | |
| 81 | /* Check if this isn't a single byte option */ |
| 82 | if (opt > DCCPO_MAX_RESERVED) { |
| 83 | if (opt_ptr == opt_end) |
| 84 | goto out_invalid_option; |
| 85 | |
| 86 | len = *opt_ptr++; |
| 87 | if (len < 3) |
| 88 | goto out_invalid_option; |
| 89 | /* |
| 90 | * Remove the type and len fields, leaving |
| 91 | * just the value size |
| 92 | */ |
| 93 | len -= 2; |
| 94 | value = opt_ptr; |
| 95 | opt_ptr += len; |
| 96 | |
| 97 | if (opt_ptr > opt_end) |
| 98 | goto out_invalid_option; |
| 99 | } |
| 100 | |
Gerrit Renker | 8b81941 | 2007-12-13 12:29:24 -0200 | [diff] [blame] | 101 | /* |
| 102 | * CCID-Specific Options (from RFC 4340, sec. 10.3): |
| 103 | * |
| 104 | * Option numbers 128 through 191 are for options sent from the |
| 105 | * HC-Sender to the HC-Receiver; option numbers 192 through 255 |
| 106 | * are for options sent from the HC-Receiver to the HC-Sender. |
| 107 | * |
| 108 | * CCID-specific options are ignored during connection setup, as |
| 109 | * negotiation may still be in progress (see RFC 4340, 10.3). |
| 110 | * |
| 111 | */ |
| 112 | if (dreq != NULL && opt >= 128) |
| 113 | goto ignore_option; |
| 114 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 115 | switch (opt) { |
| 116 | case DCCPO_PADDING: |
| 117 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 118 | case DCCPO_MANDATORY: |
| 119 | if (mandatory) |
| 120 | goto out_invalid_option; |
Arnaldo Carvalho de Melo | 6df9424 | 2006-03-20 22:06:02 -0800 | [diff] [blame] | 121 | if (pkt_type != DCCP_PKT_DATA) |
| 122 | mandatory = 1; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 123 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 124 | case DCCPO_NDP_COUNT: |
| 125 | if (len > 3) |
| 126 | goto out_invalid_option; |
| 127 | |
| 128 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); |
Gerrit Renker | 09dbc38 | 2006-11-14 12:57:34 -0200 | [diff] [blame] | 129 | dccp_pr_debug("%s rx opt: NDP count=%d\n", dccp_role(sk), |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 130 | opt_recv->dccpor_ndp); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 131 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 132 | case DCCPO_CHANGE_L: |
| 133 | /* fall through */ |
| 134 | case DCCPO_CHANGE_R: |
| 135 | if (len < 2) |
| 136 | goto out_invalid_option; |
| 137 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, |
| 138 | len - 1); |
| 139 | /* |
| 140 | * When there is a change error, change_recv is |
| 141 | * responsible for dealing with it. i.e. reply with an |
| 142 | * empty confirm. |
| 143 | * If the change was mandatory, then we need to die. |
| 144 | */ |
| 145 | if (rc && mandatory) |
| 146 | goto out_invalid_option; |
| 147 | break; |
| 148 | case DCCPO_CONFIRM_L: |
| 149 | /* fall through */ |
| 150 | case DCCPO_CONFIRM_R: |
| 151 | if (len < 2) |
| 152 | goto out_invalid_option; |
| 153 | if (dccp_feat_confirm_recv(sk, opt, *value, |
| 154 | value + 1, len - 1)) |
| 155 | goto out_invalid_option; |
| 156 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 157 | case DCCPO_ACK_VECTOR_0: |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 158 | case DCCPO_ACK_VECTOR_1: |
Gerrit Renker | c86ab2b | 2007-11-21 10:13:53 -0200 | [diff] [blame] | 159 | if (dccp_packet_without_ack(skb)) /* RFC 4340, 11.4 */ |
Arnaldo Carvalho de Melo | e5a6de9 | 2006-03-20 22:30:51 -0800 | [diff] [blame] | 160 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 161 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 162 | if (dccp_msk(sk)->dccpms_send_ack_vector && |
Andrea Bittau | bdf13d2 | 2006-11-24 13:02:42 -0200 | [diff] [blame] | 163 | dccp_ackvec_parse(sk, skb, &ackno, opt, value, len)) |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 164 | goto out_invalid_option; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 165 | break; |
| 166 | case DCCPO_TIMESTAMP: |
| 167 | if (len != 4) |
| 168 | goto out_invalid_option; |
Gerrit Renker | b4d4f7c | 2007-12-13 12:37:19 -0200 | [diff] [blame] | 169 | /* |
| 170 | * RFC 4340 13.1: "The precise time corresponding to |
| 171 | * Timestamp Value zero is not specified". We use |
| 172 | * zero to indicate absence of a meaningful timestamp. |
| 173 | */ |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 174 | opt_val = get_unaligned((__be32 *)value); |
Gerrit Renker | b4d4f7c | 2007-12-13 12:37:19 -0200 | [diff] [blame] | 175 | if (unlikely(opt_val == 0)) { |
| 176 | DCCP_WARN("Timestamp with zero value\n"); |
| 177 | break; |
| 178 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 179 | |
Gerrit Renker | b4d4f7c | 2007-12-13 12:37:19 -0200 | [diff] [blame] | 180 | if (dreq != NULL) { |
| 181 | dreq->dreq_timestamp_echo = ntohl(opt_val); |
| 182 | dreq->dreq_timestamp_time = dccp_timestamp(); |
| 183 | } else { |
| 184 | opt_recv->dccpor_timestamp = |
| 185 | dp->dccps_timestamp_echo = ntohl(opt_val); |
| 186 | dp->dccps_timestamp_time = dccp_timestamp(); |
| 187 | } |
Gerrit Renker | 09dbc38 | 2006-11-14 12:57:34 -0200 | [diff] [blame] | 188 | dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", |
Gerrit Renker | b4d4f7c | 2007-12-13 12:37:19 -0200 | [diff] [blame] | 189 | dccp_role(sk), ntohl(opt_val), |
David S. Miller | f6ccf55 | 2005-08-09 20:27:14 -0700 | [diff] [blame] | 190 | (unsigned long long) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 191 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
| 192 | break; |
| 193 | case DCCPO_TIMESTAMP_ECHO: |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 194 | if (len != 4 && len != 6 && len != 8) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 195 | goto out_invalid_option; |
| 196 | |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 197 | opt_val = get_unaligned((__be32 *)value); |
| 198 | opt_recv->dccpor_timestamp_echo = ntohl(opt_val); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 199 | |
Gerrit Renker | 09dbc38 | 2006-11-14 12:57:34 -0200 | [diff] [blame] | 200 | dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " |
Gerrit Renker | f73f709 | 2007-04-20 13:56:47 -0700 | [diff] [blame] | 201 | "ackno=%llu", dccp_role(sk), |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 202 | opt_recv->dccpor_timestamp_echo, |
David S. Miller | f6ccf55 | 2005-08-09 20:27:14 -0700 | [diff] [blame] | 203 | len + 2, |
| 204 | (unsigned long long) |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 205 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 206 | |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 207 | value += 4; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 208 | |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 209 | if (len == 4) { /* no elapsed time included */ |
Gerrit Renker | f73f709 | 2007-04-20 13:56:47 -0700 | [diff] [blame] | 210 | dccp_pr_debug_cat("\n"); |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 211 | break; |
Gerrit Renker | f73f709 | 2007-04-20 13:56:47 -0700 | [diff] [blame] | 212 | } |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 213 | |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 214 | if (len == 6) { /* 2-byte elapsed time */ |
| 215 | __be16 opt_val2 = get_unaligned((__be16 *)value); |
| 216 | elapsed_time = ntohs(opt_val2); |
| 217 | } else { /* 4-byte elapsed time */ |
| 218 | opt_val = get_unaligned((__be32 *)value); |
| 219 | elapsed_time = ntohl(opt_val); |
| 220 | } |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 221 | |
Gerrit Renker | dcad856 | 2007-10-04 14:44:01 -0700 | [diff] [blame] | 222 | dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time); |
Gerrit Renker | f73f709 | 2007-04-20 13:56:47 -0700 | [diff] [blame] | 223 | |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 224 | /* Give precedence to the biggest ELAPSED_TIME */ |
| 225 | if (elapsed_time > opt_recv->dccpor_elapsed_time) |
| 226 | opt_recv->dccpor_elapsed_time = elapsed_time; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 227 | break; |
| 228 | case DCCPO_ELAPSED_TIME: |
Gerrit Renker | c86ab2b | 2007-11-21 10:13:53 -0200 | [diff] [blame] | 229 | if (dccp_packet_without_ack(skb)) /* RFC 4340, 13.2 */ |
| 230 | break; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 231 | |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 232 | if (len == 2) { |
| 233 | __be16 opt_val2 = get_unaligned((__be16 *)value); |
| 234 | elapsed_time = ntohs(opt_val2); |
Gerrit Renker | c86ab2b | 2007-11-21 10:13:53 -0200 | [diff] [blame] | 235 | } else if (len == 4) { |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 236 | opt_val = get_unaligned((__be32 *)value); |
| 237 | elapsed_time = ntohl(opt_val); |
Gerrit Renker | c86ab2b | 2007-11-21 10:13:53 -0200 | [diff] [blame] | 238 | } else { |
| 239 | goto out_invalid_option; |
Gerrit Renker | 76fd1e8 | 2007-10-24 10:46:58 -0200 | [diff] [blame] | 240 | } |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 241 | |
| 242 | if (elapsed_time > opt_recv->dccpor_elapsed_time) |
| 243 | opt_recv->dccpor_elapsed_time = elapsed_time; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 244 | |
Gerrit Renker | 09dbc38 | 2006-11-14 12:57:34 -0200 | [diff] [blame] | 245 | dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", |
| 246 | dccp_role(sk), elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 247 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 248 | case 128 ... 191: { |
| 249 | const u16 idx = value - options; |
| 250 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 251 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
| 252 | opt, len, idx, |
| 253 | value) != 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 254 | goto out_invalid_option; |
| 255 | } |
| 256 | break; |
| 257 | case 192 ... 255: { |
| 258 | const u16 idx = value - options; |
| 259 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 260 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
| 261 | opt, len, idx, |
| 262 | value) != 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 263 | goto out_invalid_option; |
| 264 | } |
| 265 | break; |
| 266 | default: |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 267 | DCCP_CRIT("DCCP(%p): option %d(len=%d) not " |
| 268 | "implemented, ignoring", sk, opt, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 269 | break; |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 270 | } |
Gerrit Renker | 8b81941 | 2007-12-13 12:29:24 -0200 | [diff] [blame] | 271 | ignore_option: |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 272 | if (opt != DCCPO_MANDATORY) |
| 273 | mandatory = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 274 | } |
| 275 | |
Arnaldo Carvalho de Melo | 6df9424 | 2006-03-20 22:06:02 -0800 | [diff] [blame] | 276 | /* mandatory was the last byte in option list -> reset connection */ |
| 277 | if (mandatory) |
| 278 | goto out_invalid_option; |
| 279 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 280 | return 0; |
| 281 | |
| 282 | out_invalid_option: |
| 283 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); |
| 284 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 285 | DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 286 | return -1; |
| 287 | } |
| 288 | |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 289 | EXPORT_SYMBOL_GPL(dccp_parse_options); |
| 290 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 291 | static void dccp_encode_value_var(const u32 value, unsigned char *to, |
| 292 | const unsigned int len) |
| 293 | { |
| 294 | if (len > 3) |
| 295 | *to++ = (value & 0xFF000000) >> 24; |
| 296 | if (len > 2) |
| 297 | *to++ = (value & 0xFF0000) >> 16; |
| 298 | if (len > 1) |
| 299 | *to++ = (value & 0xFF00) >> 8; |
| 300 | if (len > 0) |
| 301 | *to++ = (value & 0xFF); |
| 302 | } |
| 303 | |
| 304 | static inline int dccp_ndp_len(const int ndp) |
| 305 | { |
| 306 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; |
| 307 | } |
| 308 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 309 | 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] | 310 | const unsigned char option, |
| 311 | const void *value, const unsigned char len) |
| 312 | { |
| 313 | unsigned char *to; |
| 314 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 315 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) |
| 316 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 317 | |
| 318 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; |
| 319 | |
| 320 | to = skb_push(skb, len + 2); |
| 321 | *to++ = option; |
| 322 | *to++ = len + 2; |
| 323 | |
| 324 | memcpy(to, value, len); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 325 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | EXPORT_SYMBOL_GPL(dccp_insert_option); |
| 329 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 330 | static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 331 | { |
| 332 | struct dccp_sock *dp = dccp_sk(sk); |
| 333 | int ndp = dp->dccps_ndp_count; |
| 334 | |
| 335 | if (dccp_non_data_packet(skb)) |
| 336 | ++dp->dccps_ndp_count; |
| 337 | else |
| 338 | dp->dccps_ndp_count = 0; |
| 339 | |
| 340 | if (ndp > 0) { |
| 341 | unsigned char *ptr; |
| 342 | const int ndp_len = dccp_ndp_len(ndp); |
| 343 | const int len = ndp_len + 2; |
| 344 | |
| 345 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 346 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 347 | |
| 348 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; |
| 349 | |
| 350 | ptr = skb_push(skb, len); |
| 351 | *ptr++ = DCCPO_NDP_COUNT; |
| 352 | *ptr++ = len; |
| 353 | dccp_encode_value_var(ndp, ptr, ndp_len); |
| 354 | } |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 355 | |
| 356 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) |
| 360 | { |
Ian McDonald | b1c9fe7 | 2005-08-18 20:45:29 -0300 | [diff] [blame] | 361 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 364 | int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, |
| 365 | u32 elapsed_time) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 366 | { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 367 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
| 368 | const int len = 2 + elapsed_time_len; |
| 369 | unsigned char *to; |
| 370 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 371 | if (elapsed_time_len == 0) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 372 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 373 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 374 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
| 375 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 376 | |
| 377 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; |
| 378 | |
| 379 | to = skb_push(skb, len); |
| 380 | *to++ = DCCPO_ELAPSED_TIME; |
| 381 | *to++ = len; |
| 382 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 383 | if (elapsed_time_len == 2) { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 384 | const __be16 var16 = htons((u16)elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 385 | memcpy(to, &var16, 2); |
| 386 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 387 | const __be32 var32 = htonl(elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 388 | memcpy(to, &var32, 4); |
| 389 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 390 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 391 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Arnaldo Carvalho de Melo | d4b81ff | 2005-08-23 21:51:36 -0700 | [diff] [blame] | 394 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 395 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 396 | int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 397 | { |
Gerrit Renker | 4c70f38 | 2007-09-25 22:40:13 -0700 | [diff] [blame] | 398 | __be32 now = htonl(dccp_timestamp()); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 399 | /* yes this will overflow but that is the point as we want a |
| 400 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ |
| 401 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 402 | return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 403 | } |
| 404 | |
Arnaldo Carvalho de Melo | d4b81ff | 2005-08-23 21:51:36 -0700 | [diff] [blame] | 405 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
| 406 | |
Gerrit Renker | b4d4f7c | 2007-12-13 12:37:19 -0200 | [diff] [blame] | 407 | static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp, |
| 408 | struct dccp_request_sock *dreq, |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 409 | struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 410 | { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 411 | __be32 tstamp_echo; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 412 | unsigned char *to; |
Gerrit Renker | b4d4f7c | 2007-12-13 12:37:19 -0200 | [diff] [blame] | 413 | u32 elapsed_time, elapsed_time_len, len; |
| 414 | |
| 415 | if (dreq != NULL) { |
| 416 | elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time; |
| 417 | tstamp_echo = htonl(dreq->dreq_timestamp_echo); |
| 418 | dreq->dreq_timestamp_echo = 0; |
| 419 | } else { |
| 420 | elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time; |
| 421 | tstamp_echo = htonl(dp->dccps_timestamp_echo); |
| 422 | dp->dccps_timestamp_echo = 0; |
| 423 | } |
| 424 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 425 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
| 426 | len = 6 + elapsed_time_len; |
| 427 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 428 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
| 429 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 430 | |
| 431 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; |
| 432 | |
| 433 | to = skb_push(skb, len); |
| 434 | *to++ = DCCPO_TIMESTAMP_ECHO; |
| 435 | *to++ = len; |
| 436 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 437 | memcpy(to, &tstamp_echo, 4); |
| 438 | to += 4; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 439 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 440 | if (elapsed_time_len == 2) { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 441 | const __be16 var16 = htons((u16)elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 442 | memcpy(to, &var16, 2); |
| 443 | } else if (elapsed_time_len == 4) { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 444 | const __be32 var32 = htonl(elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 445 | memcpy(to, &var32, 4); |
| 446 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 447 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 448 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 451 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
YOSHIFUJI Hideaki | c9eaf17 | 2007-02-09 23:24:38 +0900 | [diff] [blame] | 452 | u8 *val, u8 len) |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 453 | { |
| 454 | u8 *to; |
| 455 | |
| 456 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { |
Gerrit Renker | 59348b1 | 2006-11-20 18:39:23 -0200 | [diff] [blame] | 457 | DCCP_WARN("packet too small for feature %d option!\n", feat); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 458 | return -1; |
| 459 | } |
| 460 | |
| 461 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; |
| 462 | |
| 463 | to = skb_push(skb, len + 3); |
| 464 | *to++ = type; |
| 465 | *to++ = len + 3; |
| 466 | *to++ = feat; |
| 467 | |
| 468 | if (len) |
| 469 | memcpy(to, val, len); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 470 | |
Gerrit Renker | c02fdc0 | 2006-11-14 12:48:10 -0200 | [diff] [blame] | 471 | dccp_pr_debug("%s(%s (%d), ...), length %d\n", |
| 472 | dccp_feat_typename(type), |
| 473 | dccp_feat_name(feat), feat, len); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 474 | return 0; |
| 475 | } |
| 476 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 477 | static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 478 | { |
| 479 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 480 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 481 | struct dccp_opt_pend *opt, *next; |
| 482 | int change = 0; |
| 483 | |
| 484 | /* confirm any options [NN opts] */ |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 485 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 486 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
| 487 | opt->dccpop_feat, opt->dccpop_val, |
| 488 | opt->dccpop_len); |
| 489 | /* fear empty confirms */ |
| 490 | if (opt->dccpop_val) |
| 491 | kfree(opt->dccpop_val); |
| 492 | kfree(opt); |
| 493 | } |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 494 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 495 | |
| 496 | /* see which features we need to send */ |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 497 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 498 | /* see if we need to send any confirm */ |
| 499 | if (opt->dccpop_sc) { |
| 500 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, |
| 501 | opt->dccpop_feat, |
| 502 | opt->dccpop_sc->dccpoc_val, |
| 503 | opt->dccpop_sc->dccpoc_len); |
| 504 | |
| 505 | BUG_ON(!opt->dccpop_sc->dccpoc_val); |
| 506 | kfree(opt->dccpop_sc->dccpoc_val); |
| 507 | kfree(opt->dccpop_sc); |
| 508 | opt->dccpop_sc = NULL; |
| 509 | } |
| 510 | |
| 511 | /* any option not confirmed, re-send it */ |
| 512 | if (!opt->dccpop_conf) { |
| 513 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
| 514 | opt->dccpop_feat, opt->dccpop_val, |
| 515 | opt->dccpop_len); |
| 516 | change++; |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | /* Retransmit timer. |
| 521 | * If this is the master listening sock, we don't set a timer on it. It |
| 522 | * should be fine because if the dude doesn't receive our RESPONSE |
| 523 | * [which will contain the CHANGE] he will send another REQUEST which |
| 524 | * will "retrnasmit" the change. |
| 525 | */ |
| 526 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { |
| 527 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); |
| 528 | |
| 529 | /* XXX don't reset the timer on re-transmissions. I.e. reset it |
| 530 | * only when sending new stuff i guess. Currently the timer |
| 531 | * never backs off because on re-transmission it just resets it! |
| 532 | */ |
| 533 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 534 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); |
| 535 | } |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 536 | |
| 537 | return 0; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 538 | } |
| 539 | |
Gerrit Renker | af3b867 | 2007-12-13 12:38:11 -0200 | [diff] [blame^] | 540 | /* The length of all options needs to be a multiple of 4 (5.8) */ |
| 541 | static void dccp_insert_option_padding(struct sk_buff *skb) |
| 542 | { |
| 543 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; |
| 544 | |
| 545 | if (padding != 0) { |
| 546 | padding = 4 - padding; |
| 547 | memset(skb_push(skb, padding), 0, padding); |
| 548 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; |
| 549 | } |
| 550 | } |
| 551 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 552 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 553 | { |
| 554 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 555 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 556 | |
| 557 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; |
| 558 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 559 | if (dmsk->dccpms_send_ndp_count && |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 560 | dccp_insert_option_ndp(sk, skb)) |
| 561 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 562 | |
| 563 | if (!dccp_packet_without_ack(skb)) { |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 564 | if (dmsk->dccpms_send_ack_vector && |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 565 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
| 566 | dccp_insert_option_ackvec(sk, skb)) |
| 567 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 568 | } |
| 569 | |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 570 | if (dp->dccps_hc_rx_insert_options) { |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 571 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
| 572 | return -1; |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 573 | dp->dccps_hc_rx_insert_options = 0; |
| 574 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 575 | |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 576 | /* Feature negotiation */ |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 577 | /* Data packets can't do feat negotiation */ |
| 578 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && |
| 579 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && |
| 580 | dccp_insert_options_feat(sk, skb)) |
| 581 | return -1; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 582 | |
Gerrit Renker | 89560b5 | 2007-03-20 15:27:17 -0300 | [diff] [blame] | 583 | /* |
| 584 | * Obtain RTT sample from Request/Response exchange. |
| 585 | * This is currently used in CCID 3 initialisation. |
| 586 | */ |
| 587 | if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST && |
| 588 | dccp_insert_option_timestamp(sk, skb)) |
| 589 | return -1; |
| 590 | |
Gerrit Renker | b4d4f7c | 2007-12-13 12:37:19 -0200 | [diff] [blame] | 591 | if (dp->dccps_timestamp_echo != 0 && |
| 592 | dccp_insert_option_timestamp_echo(dp, NULL, skb)) |
| 593 | return -1; |
| 594 | |
Gerrit Renker | af3b867 | 2007-12-13 12:38:11 -0200 | [diff] [blame^] | 595 | dccp_insert_option_padding(skb); |
| 596 | return 0; |
| 597 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 598 | |
Gerrit Renker | af3b867 | 2007-12-13 12:38:11 -0200 | [diff] [blame^] | 599 | int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb) |
| 600 | { |
| 601 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 602 | |
Gerrit Renker | af3b867 | 2007-12-13 12:38:11 -0200 | [diff] [blame^] | 603 | if (dreq->dreq_timestamp_echo != 0 && |
| 604 | dccp_insert_option_timestamp_echo(NULL, dreq, skb)) |
| 605 | return -1; |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 606 | |
Gerrit Renker | af3b867 | 2007-12-13 12:38:11 -0200 | [diff] [blame^] | 607 | dccp_insert_option_padding(skb); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 608 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 609 | } |