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> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/skbuff.h> |
| 19 | |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 20 | #include "ackvec.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 21 | #include "ccid.h" |
| 22 | #include "dccp.h" |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 23 | #include "feat.h" |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 24 | |
Arnaldo Carvalho de Melo | e55d912 | 2006-03-20 19:25:02 -0800 | [diff] [blame] | 25 | int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; |
| 26 | int dccp_feat_default_rx_ccid = DCCPF_INITIAL_CCID; |
| 27 | int dccp_feat_default_tx_ccid = DCCPF_INITIAL_CCID; |
| 28 | int dccp_feat_default_ack_ratio = DCCPF_INITIAL_ACK_RATIO; |
| 29 | int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; |
| 30 | int dccp_feat_default_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 31 | |
Ian McDonald | 4b79f0a | 2006-07-23 23:33:28 -0700 | [diff] [blame] | 32 | EXPORT_SYMBOL_GPL(dccp_feat_default_sequence_window); |
| 33 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 34 | void dccp_minisock_init(struct dccp_minisock *dmsk) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 35 | { |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 36 | dmsk->dccpms_sequence_window = dccp_feat_default_sequence_window; |
| 37 | dmsk->dccpms_rx_ccid = dccp_feat_default_rx_ccid; |
| 38 | dmsk->dccpms_tx_ccid = dccp_feat_default_tx_ccid; |
| 39 | dmsk->dccpms_ack_ratio = dccp_feat_default_ack_ratio; |
| 40 | dmsk->dccpms_send_ack_vector = dccp_feat_default_send_ack_vector; |
| 41 | dmsk->dccpms_send_ndp_count = dccp_feat_default_send_ndp_count; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) |
| 45 | { |
| 46 | u32 value = 0; |
| 47 | |
| 48 | if (len > 3) |
| 49 | value += *bf++ << 24; |
| 50 | if (len > 2) |
| 51 | value += *bf++ << 16; |
| 52 | if (len > 1) |
| 53 | value += *bf++ << 8; |
| 54 | if (len > 0) |
| 55 | value += *bf; |
| 56 | |
| 57 | return value; |
| 58 | } |
| 59 | |
| 60 | int dccp_parse_options(struct sock *sk, struct sk_buff *skb) |
| 61 | { |
| 62 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | 725ba8e | 2005-08-13 20:35:39 -0300 | [diff] [blame] | 63 | #ifdef CONFIG_IP_DCCP_DEBUG |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 64 | const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? |
| 65 | "CLIENT rx opt: " : "server rx opt: "; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 66 | #endif |
| 67 | const struct dccp_hdr *dh = dccp_hdr(skb); |
| 68 | const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; |
| 69 | unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); |
| 70 | unsigned char *opt_ptr = options; |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 71 | const unsigned char *opt_end = (unsigned char *)dh + |
| 72 | (dh->dccph_doff * 4); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 73 | struct dccp_options_received *opt_recv = &dp->dccps_options_received; |
| 74 | unsigned char opt, len; |
| 75 | unsigned char *value; |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 76 | u32 elapsed_time; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 77 | int rc; |
| 78 | int mandatory = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 79 | |
| 80 | memset(opt_recv, 0, sizeof(*opt_recv)); |
| 81 | |
David S. Miller | fb95049 | 2006-03-20 22:36:01 -0800 | [diff] [blame] | 82 | opt = len = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 83 | while (opt_ptr != opt_end) { |
| 84 | opt = *opt_ptr++; |
| 85 | len = 0; |
| 86 | value = NULL; |
| 87 | |
| 88 | /* Check if this isn't a single byte option */ |
| 89 | if (opt > DCCPO_MAX_RESERVED) { |
| 90 | if (opt_ptr == opt_end) |
| 91 | goto out_invalid_option; |
| 92 | |
| 93 | len = *opt_ptr++; |
| 94 | if (len < 3) |
| 95 | goto out_invalid_option; |
| 96 | /* |
| 97 | * Remove the type and len fields, leaving |
| 98 | * just the value size |
| 99 | */ |
| 100 | len -= 2; |
| 101 | value = opt_ptr; |
| 102 | opt_ptr += len; |
| 103 | |
| 104 | if (opt_ptr > opt_end) |
| 105 | goto out_invalid_option; |
| 106 | } |
| 107 | |
| 108 | switch (opt) { |
| 109 | case DCCPO_PADDING: |
| 110 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 111 | case DCCPO_MANDATORY: |
| 112 | if (mandatory) |
| 113 | goto out_invalid_option; |
Arnaldo Carvalho de Melo | 6df9424 | 2006-03-20 22:06:02 -0800 | [diff] [blame] | 114 | if (pkt_type != DCCP_PKT_DATA) |
| 115 | mandatory = 1; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 116 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 117 | case DCCPO_NDP_COUNT: |
| 118 | if (len > 3) |
| 119 | goto out_invalid_option; |
| 120 | |
| 121 | opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 122 | dccp_pr_debug("%sNDP count=%d\n", debug_prefix, |
| 123 | opt_recv->dccpor_ndp); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 124 | break; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 125 | case DCCPO_CHANGE_L: |
| 126 | /* fall through */ |
| 127 | case DCCPO_CHANGE_R: |
| 128 | if (len < 2) |
| 129 | goto out_invalid_option; |
| 130 | rc = dccp_feat_change_recv(sk, opt, *value, value + 1, |
| 131 | len - 1); |
| 132 | /* |
| 133 | * When there is a change error, change_recv is |
| 134 | * responsible for dealing with it. i.e. reply with an |
| 135 | * empty confirm. |
| 136 | * If the change was mandatory, then we need to die. |
| 137 | */ |
| 138 | if (rc && mandatory) |
| 139 | goto out_invalid_option; |
| 140 | break; |
| 141 | case DCCPO_CONFIRM_L: |
| 142 | /* fall through */ |
| 143 | case DCCPO_CONFIRM_R: |
| 144 | if (len < 2) |
| 145 | goto out_invalid_option; |
| 146 | if (dccp_feat_confirm_recv(sk, opt, *value, |
| 147 | value + 1, len - 1)) |
| 148 | goto out_invalid_option; |
| 149 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 150 | case DCCPO_ACK_VECTOR_0: |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 151 | case DCCPO_ACK_VECTOR_1: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 152 | if (pkt_type == DCCP_PKT_DATA) |
Arnaldo Carvalho de Melo | e5a6de9 | 2006-03-20 22:30:51 -0800 | [diff] [blame] | 153 | break; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 154 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 155 | if (dccp_msk(sk)->dccpms_send_ack_vector && |
Arnaldo Carvalho de Melo | ae31c33 | 2005-09-18 00:17:51 -0700 | [diff] [blame] | 156 | dccp_ackvec_parse(sk, skb, opt, value, len)) |
| 157 | goto out_invalid_option; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 158 | break; |
| 159 | case DCCPO_TIMESTAMP: |
| 160 | if (len != 4) |
| 161 | goto out_invalid_option; |
| 162 | |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 163 | opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 164 | |
| 165 | dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 166 | dccp_timestamp(sk, &dp->dccps_timestamp_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 167 | |
| 168 | dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n", |
| 169 | debug_prefix, opt_recv->dccpor_timestamp, |
David S. Miller | f6ccf55 | 2005-08-09 20:27:14 -0700 | [diff] [blame] | 170 | (unsigned long long) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 171 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
| 172 | break; |
| 173 | case DCCPO_TIMESTAMP_ECHO: |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 174 | if (len != 4 && len != 6 && len != 8) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 175 | goto out_invalid_option; |
| 176 | |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 177 | opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 178 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 179 | dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ", |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 180 | debug_prefix, |
| 181 | opt_recv->dccpor_timestamp_echo, |
David S. Miller | f6ccf55 | 2005-08-09 20:27:14 -0700 | [diff] [blame] | 182 | len + 2, |
| 183 | (unsigned long long) |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 184 | DCCP_SKB_CB(skb)->dccpd_ack_seq); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 185 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 186 | |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 187 | if (len == 4) |
| 188 | break; |
| 189 | |
| 190 | if (len == 6) |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 191 | elapsed_time = ntohs(*(__be16 *)(value + 4)); |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 192 | else |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 193 | elapsed_time = ntohl(*(__be32 *)(value + 4)); |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 194 | |
| 195 | /* Give precedence to the biggest ELAPSED_TIME */ |
| 196 | if (elapsed_time > opt_recv->dccpor_elapsed_time) |
| 197 | opt_recv->dccpor_elapsed_time = elapsed_time; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 198 | break; |
| 199 | case DCCPO_ELAPSED_TIME: |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 200 | if (len != 2 && len != 4) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 201 | goto out_invalid_option; |
| 202 | |
| 203 | if (pkt_type == DCCP_PKT_DATA) |
| 204 | continue; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 205 | |
| 206 | if (len == 2) |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 207 | elapsed_time = ntohs(*(__be16 *)value); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 208 | else |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 209 | elapsed_time = ntohl(*(__be32 *)value); |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 210 | |
| 211 | if (elapsed_time > opt_recv->dccpor_elapsed_time) |
| 212 | opt_recv->dccpor_elapsed_time = elapsed_time; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 213 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 214 | dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix, |
Arnaldo Carvalho de Melo | 1c14ac0 | 2005-09-09 02:32:01 -0300 | [diff] [blame] | 215 | elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 216 | break; |
| 217 | /* |
Gerrit Renker | 0e64e94 | 2006-10-24 16:17:51 -0700 | [diff] [blame] | 218 | * From RFC 4340, sec. 10.3: |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 219 | * |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 220 | * Option numbers 128 through 191 are for |
| 221 | * options sent from the HC-Sender to the |
| 222 | * HC-Receiver; option numbers 192 through 255 |
| 223 | * are for options sent from the HC-Receiver to |
| 224 | * the HC-Sender. |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 225 | */ |
| 226 | case 128 ... 191: { |
| 227 | const u16 idx = value - options; |
| 228 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 229 | if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, |
| 230 | opt, len, idx, |
| 231 | value) != 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 232 | goto out_invalid_option; |
| 233 | } |
| 234 | break; |
| 235 | case 192 ... 255: { |
| 236 | const u16 idx = value - options; |
| 237 | |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 238 | if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, |
| 239 | opt, len, idx, |
| 240 | value) != 0) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 241 | goto out_invalid_option; |
| 242 | } |
| 243 | break; |
| 244 | default: |
Arnaldo Carvalho de Melo | 7690af3 | 2005-08-13 20:34:54 -0300 | [diff] [blame] | 245 | pr_info("DCCP(%p): option %d(len=%d) not " |
| 246 | "implemented, ignoring\n", |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 247 | sk, opt, len); |
| 248 | break; |
| 249 | } |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 250 | |
| 251 | if (opt != DCCPO_MANDATORY) |
| 252 | mandatory = 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 253 | } |
| 254 | |
Arnaldo Carvalho de Melo | 6df9424 | 2006-03-20 22:06:02 -0800 | [diff] [blame] | 255 | /* mandatory was the last byte in option list -> reset connection */ |
| 256 | if (mandatory) |
| 257 | goto out_invalid_option; |
| 258 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 259 | return 0; |
| 260 | |
| 261 | out_invalid_option: |
| 262 | DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); |
| 263 | DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; |
| 264 | pr_info("DCCP(%p): invalid option %d, len=%d\n", sk, opt, len); |
| 265 | return -1; |
| 266 | } |
| 267 | |
Arnaldo Carvalho de Melo | b61fafc | 2006-03-20 21:25:11 -0800 | [diff] [blame] | 268 | EXPORT_SYMBOL_GPL(dccp_parse_options); |
| 269 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 270 | static void dccp_encode_value_var(const u32 value, unsigned char *to, |
| 271 | const unsigned int len) |
| 272 | { |
| 273 | if (len > 3) |
| 274 | *to++ = (value & 0xFF000000) >> 24; |
| 275 | if (len > 2) |
| 276 | *to++ = (value & 0xFF0000) >> 16; |
| 277 | if (len > 1) |
| 278 | *to++ = (value & 0xFF00) >> 8; |
| 279 | if (len > 0) |
| 280 | *to++ = (value & 0xFF); |
| 281 | } |
| 282 | |
| 283 | static inline int dccp_ndp_len(const int ndp) |
| 284 | { |
| 285 | return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; |
| 286 | } |
| 287 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 288 | 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] | 289 | const unsigned char option, |
| 290 | const void *value, const unsigned char len) |
| 291 | { |
| 292 | unsigned char *to; |
| 293 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 294 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) |
| 295 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 296 | |
| 297 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; |
| 298 | |
| 299 | to = skb_push(skb, len + 2); |
| 300 | *to++ = option; |
| 301 | *to++ = len + 2; |
| 302 | |
| 303 | memcpy(to, value, len); |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 304 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | EXPORT_SYMBOL_GPL(dccp_insert_option); |
| 308 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 309 | 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] | 310 | { |
| 311 | struct dccp_sock *dp = dccp_sk(sk); |
| 312 | int ndp = dp->dccps_ndp_count; |
| 313 | |
| 314 | if (dccp_non_data_packet(skb)) |
| 315 | ++dp->dccps_ndp_count; |
| 316 | else |
| 317 | dp->dccps_ndp_count = 0; |
| 318 | |
| 319 | if (ndp > 0) { |
| 320 | unsigned char *ptr; |
| 321 | const int ndp_len = dccp_ndp_len(ndp); |
| 322 | const int len = ndp_len + 2; |
| 323 | |
| 324 | 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] | 325 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 326 | |
| 327 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; |
| 328 | |
| 329 | ptr = skb_push(skb, len); |
| 330 | *ptr++ = DCCPO_NDP_COUNT; |
| 331 | *ptr++ = len; |
| 332 | dccp_encode_value_var(ndp, ptr, ndp_len); |
| 333 | } |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 334 | |
| 335 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | static inline int dccp_elapsed_time_len(const u32 elapsed_time) |
| 339 | { |
Ian McDonald | b1c9fe7 | 2005-08-18 20:45:29 -0300 | [diff] [blame] | 340 | return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 341 | } |
| 342 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 343 | int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, |
| 344 | u32 elapsed_time) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 345 | { |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 346 | const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
| 347 | const int len = 2 + elapsed_time_len; |
| 348 | unsigned char *to; |
| 349 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 350 | if (elapsed_time_len == 0) |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 351 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 352 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 353 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
| 354 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 355 | |
| 356 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; |
| 357 | |
| 358 | to = skb_push(skb, len); |
| 359 | *to++ = DCCPO_ELAPSED_TIME; |
| 360 | *to++ = len; |
| 361 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 362 | if (elapsed_time_len == 2) { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 363 | const __be16 var16 = htons((u16)elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 364 | memcpy(to, &var16, 2); |
| 365 | } else { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 366 | const __be32 var32 = htonl(elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 367 | memcpy(to, &var32, 4); |
| 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 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Arnaldo Carvalho de Melo | d4b81ff | 2005-08-23 21:51:36 -0700 | [diff] [blame] | 373 | EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 374 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 375 | void dccp_timestamp(const struct sock *sk, struct timeval *tv) |
| 376 | { |
| 377 | const struct dccp_sock *dp = dccp_sk(sk); |
| 378 | |
| 379 | do_gettimeofday(tv); |
| 380 | tv->tv_sec -= dp->dccps_epoch.tv_sec; |
| 381 | tv->tv_usec -= dp->dccps_epoch.tv_usec; |
| 382 | |
| 383 | while (tv->tv_usec < 0) { |
| 384 | tv->tv_sec--; |
| 385 | tv->tv_usec += USEC_PER_SEC; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | EXPORT_SYMBOL_GPL(dccp_timestamp); |
| 390 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 391 | 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] | 392 | { |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 393 | struct timeval tv; |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 394 | __be32 now; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 395 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 396 | dccp_timestamp(sk, &tv); |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 397 | now = htonl(timeval_usecs(&tv) / 10); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 398 | /* yes this will overflow but that is the point as we want a |
| 399 | * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ |
| 400 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 401 | 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] | 402 | } |
| 403 | |
Arnaldo Carvalho de Melo | d4b81ff | 2005-08-23 21:51:36 -0700 | [diff] [blame] | 404 | EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); |
| 405 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 406 | static int dccp_insert_option_timestamp_echo(struct sock *sk, |
| 407 | struct sk_buff *skb) |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 408 | { |
| 409 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 410 | struct timeval now; |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 411 | __be32 tstamp_echo; |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 412 | u32 elapsed_time; |
| 413 | int len, elapsed_time_len; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 414 | unsigned char *to; |
| 415 | |
Arnaldo Carvalho de Melo | b0e5678 | 2005-09-09 02:38:35 -0300 | [diff] [blame] | 416 | dccp_timestamp(sk, &now); |
| 417 | elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10; |
| 418 | elapsed_time_len = dccp_elapsed_time_len(elapsed_time); |
| 419 | len = 6 + elapsed_time_len; |
| 420 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 421 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) |
| 422 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 423 | |
| 424 | DCCP_SKB_CB(skb)->dccpd_opt_len += len; |
| 425 | |
| 426 | to = skb_push(skb, len); |
| 427 | *to++ = DCCPO_TIMESTAMP_ECHO; |
| 428 | *to++ = len; |
| 429 | |
| 430 | tstamp_echo = htonl(dp->dccps_timestamp_echo); |
| 431 | memcpy(to, &tstamp_echo, 4); |
| 432 | to += 4; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 433 | |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 434 | if (elapsed_time_len == 2) { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 435 | const __be16 var16 = htons((u16)elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 436 | memcpy(to, &var16, 2); |
| 437 | } else if (elapsed_time_len == 4) { |
Andrea Bittau | 60fe62e | 2006-03-20 19:23:32 -0800 | [diff] [blame] | 438 | const __be32 var32 = htonl(elapsed_time); |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 439 | memcpy(to, &var32, 4); |
| 440 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 441 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 442 | dp->dccps_timestamp_echo = 0; |
Ian McDonald | 1bc0986 | 2005-08-20 00:23:43 -0300 | [diff] [blame] | 443 | dp->dccps_timestamp_time.tv_sec = 0; |
| 444 | dp->dccps_timestamp_time.tv_usec = 0; |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 445 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 446 | } |
| 447 | |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 448 | static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, |
| 449 | u8 *val, u8 len) |
| 450 | { |
| 451 | u8 *to; |
| 452 | |
| 453 | if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { |
| 454 | LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small" |
| 455 | " to insert feature %d option!\n", feat); |
| 456 | return -1; |
| 457 | } |
| 458 | |
| 459 | DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; |
| 460 | |
| 461 | to = skb_push(skb, len + 3); |
| 462 | *to++ = type; |
| 463 | *to++ = len + 3; |
| 464 | *to++ = feat; |
| 465 | |
| 466 | if (len) |
| 467 | memcpy(to, val, len); |
| 468 | dccp_pr_debug("option %d feat %d len %d\n", type, feat, len); |
| 469 | |
| 470 | return 0; |
| 471 | } |
| 472 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 473 | 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] | 474 | { |
| 475 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 476 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 477 | struct dccp_opt_pend *opt, *next; |
| 478 | int change = 0; |
| 479 | |
| 480 | /* confirm any options [NN opts] */ |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 481 | list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 482 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
| 483 | opt->dccpop_feat, opt->dccpop_val, |
| 484 | opt->dccpop_len); |
| 485 | /* fear empty confirms */ |
| 486 | if (opt->dccpop_val) |
| 487 | kfree(opt->dccpop_val); |
| 488 | kfree(opt); |
| 489 | } |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 490 | INIT_LIST_HEAD(&dmsk->dccpms_conf); |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 491 | |
| 492 | /* see which features we need to send */ |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 493 | list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 494 | /* see if we need to send any confirm */ |
| 495 | if (opt->dccpop_sc) { |
| 496 | dccp_insert_feat_opt(skb, opt->dccpop_type + 1, |
| 497 | opt->dccpop_feat, |
| 498 | opt->dccpop_sc->dccpoc_val, |
| 499 | opt->dccpop_sc->dccpoc_len); |
| 500 | |
| 501 | BUG_ON(!opt->dccpop_sc->dccpoc_val); |
| 502 | kfree(opt->dccpop_sc->dccpoc_val); |
| 503 | kfree(opt->dccpop_sc); |
| 504 | opt->dccpop_sc = NULL; |
| 505 | } |
| 506 | |
| 507 | /* any option not confirmed, re-send it */ |
| 508 | if (!opt->dccpop_conf) { |
| 509 | dccp_insert_feat_opt(skb, opt->dccpop_type, |
| 510 | opt->dccpop_feat, opt->dccpop_val, |
| 511 | opt->dccpop_len); |
| 512 | change++; |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | /* Retransmit timer. |
| 517 | * If this is the master listening sock, we don't set a timer on it. It |
| 518 | * should be fine because if the dude doesn't receive our RESPONSE |
| 519 | * [which will contain the CHANGE] he will send another REQUEST which |
| 520 | * will "retrnasmit" the change. |
| 521 | */ |
| 522 | if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { |
| 523 | dccp_pr_debug("reset feat negotiation timer %p\n", sk); |
| 524 | |
| 525 | /* XXX don't reset the timer on re-transmissions. I.e. reset it |
| 526 | * only when sending new stuff i guess. Currently the timer |
| 527 | * never backs off because on re-transmission it just resets it! |
| 528 | */ |
| 529 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, |
| 530 | inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); |
| 531 | } |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 532 | |
| 533 | return 0; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 534 | } |
| 535 | |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 536 | 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] | 537 | { |
| 538 | struct dccp_sock *dp = dccp_sk(sk); |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 539 | struct dccp_minisock *dmsk = dccp_msk(sk); |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 540 | |
| 541 | DCCP_SKB_CB(skb)->dccpd_opt_len = 0; |
| 542 | |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 543 | if (dmsk->dccpms_send_ndp_count && |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 544 | dccp_insert_option_ndp(sk, skb)) |
| 545 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 546 | |
| 547 | if (!dccp_packet_without_ack(skb)) { |
Arnaldo Carvalho de Melo | a4bf390 | 2006-03-20 22:50:58 -0800 | [diff] [blame] | 548 | if (dmsk->dccpms_send_ack_vector && |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 549 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && |
| 550 | dccp_insert_option_ackvec(sk, skb)) |
| 551 | return -1; |
| 552 | |
| 553 | if (dp->dccps_timestamp_echo != 0 && |
| 554 | dccp_insert_option_timestamp_echo(sk, skb)) |
| 555 | return -1; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 556 | } |
| 557 | |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 558 | if (dp->dccps_hc_rx_insert_options) { |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 559 | if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) |
| 560 | return -1; |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 561 | dp->dccps_hc_rx_insert_options = 0; |
| 562 | } |
| 563 | if (dp->dccps_hc_tx_insert_options) { |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 564 | if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb)) |
| 565 | return -1; |
Arnaldo Carvalho de Melo | 507d37c | 2005-09-09 02:30:07 -0300 | [diff] [blame] | 566 | dp->dccps_hc_tx_insert_options = 0; |
| 567 | } |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 568 | |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 569 | /* Feature negotiation */ |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 570 | /* Data packets can't do feat negotiation */ |
| 571 | if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && |
| 572 | DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && |
| 573 | dccp_insert_options_feat(sk, skb)) |
| 574 | return -1; |
Andrea Bittau | afe0025 | 2006-03-20 17:43:56 -0800 | [diff] [blame] | 575 | |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 576 | /* XXX: insert other options when appropriate */ |
| 577 | |
| 578 | if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { |
| 579 | /* The length of all options has to be a multiple of 4 */ |
| 580 | int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; |
| 581 | |
| 582 | if (padding != 0) { |
| 583 | padding = 4 - padding; |
| 584 | memset(skb_push(skb, padding), 0, padding); |
| 585 | DCCP_SKB_CB(skb)->dccpd_opt_len += padding; |
| 586 | } |
| 587 | } |
Arnaldo Carvalho de Melo | 2d0817d | 2006-03-20 22:32:06 -0800 | [diff] [blame] | 588 | |
| 589 | return 0; |
Arnaldo Carvalho de Melo | 7c65787 | 2005-08-09 20:14:34 -0700 | [diff] [blame] | 590 | } |