17c657876SArnaldo Carvalho de Melo /* 27c657876SArnaldo Carvalho de Melo * net/dccp/options.c 37c657876SArnaldo Carvalho de Melo * 47c657876SArnaldo Carvalho de Melo * An implementation of the DCCP protocol 51bc09869SIan McDonald * Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> 61bc09869SIan McDonald * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net> 7e6bccd35SIan McDonald * Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz> 87c657876SArnaldo Carvalho de Melo * 97c657876SArnaldo Carvalho de Melo * This program is free software; you can redistribute it and/or 107c657876SArnaldo Carvalho de Melo * modify it under the terms of the GNU General Public License 117c657876SArnaldo Carvalho de Melo * as published by the Free Software Foundation; either version 127c657876SArnaldo Carvalho de Melo * 2 of the License, or (at your option) any later version. 137c657876SArnaldo Carvalho de Melo */ 147c657876SArnaldo Carvalho de Melo #include <linux/dccp.h> 157c657876SArnaldo Carvalho de Melo #include <linux/module.h> 167c657876SArnaldo Carvalho de Melo #include <linux/types.h> 1776fd1e87SGerrit Renker #include <asm/unaligned.h> 187c657876SArnaldo Carvalho de Melo #include <linux/kernel.h> 197c657876SArnaldo Carvalho de Melo #include <linux/skbuff.h> 207c657876SArnaldo Carvalho de Melo 21ae31c339SArnaldo Carvalho de Melo #include "ackvec.h" 227c657876SArnaldo Carvalho de Melo #include "ccid.h" 237c657876SArnaldo Carvalho de Melo #include "dccp.h" 24afe00251SAndrea Bittau #include "feat.h" 257c657876SArnaldo Carvalho de Melo 26afb0a34dSGerrit Renker int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; 27afb0a34dSGerrit Renker int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID; 28afb0a34dSGerrit Renker int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID; 29afb0a34dSGerrit Renker int sysctl_dccp_feat_ack_ratio = DCCPF_INITIAL_ACK_RATIO; 30afb0a34dSGerrit Renker int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; 31afb0a34dSGerrit Renker int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; 327c657876SArnaldo Carvalho de Melo 337c657876SArnaldo Carvalho de Melo static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) 347c657876SArnaldo Carvalho de Melo { 357c657876SArnaldo Carvalho de Melo u32 value = 0; 367c657876SArnaldo Carvalho de Melo 377c657876SArnaldo Carvalho de Melo if (len > 3) 387c657876SArnaldo Carvalho de Melo value += *bf++ << 24; 397c657876SArnaldo Carvalho de Melo if (len > 2) 407c657876SArnaldo Carvalho de Melo value += *bf++ << 16; 417c657876SArnaldo Carvalho de Melo if (len > 1) 427c657876SArnaldo Carvalho de Melo value += *bf++ << 8; 437c657876SArnaldo Carvalho de Melo if (len > 0) 447c657876SArnaldo Carvalho de Melo value += *bf; 457c657876SArnaldo Carvalho de Melo 467c657876SArnaldo Carvalho de Melo return value; 477c657876SArnaldo Carvalho de Melo } 487c657876SArnaldo Carvalho de Melo 498b819412SGerrit Renker /** 508b819412SGerrit Renker * dccp_parse_options - Parse DCCP options present in @skb 518b819412SGerrit Renker * @sk: client|server|listening dccp socket (when @dreq != NULL) 528b819412SGerrit Renker * @dreq: request socket to use during connection setup, or NULL 538b819412SGerrit Renker */ 548b819412SGerrit Renker int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, 558b819412SGerrit Renker struct sk_buff *skb) 567c657876SArnaldo Carvalho de Melo { 577c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 587c657876SArnaldo Carvalho de Melo const struct dccp_hdr *dh = dccp_hdr(skb); 597c657876SArnaldo Carvalho de Melo const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; 60bdf13d20SAndrea Bittau u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; 617c657876SArnaldo Carvalho de Melo unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); 627c657876SArnaldo Carvalho de Melo unsigned char *opt_ptr = options; 637690af3fSArnaldo Carvalho de Melo const unsigned char *opt_end = (unsigned char *)dh + 647690af3fSArnaldo Carvalho de Melo (dh->dccph_doff * 4); 657c657876SArnaldo Carvalho de Melo struct dccp_options_received *opt_recv = &dp->dccps_options_received; 667c657876SArnaldo Carvalho de Melo unsigned char opt, len; 677c657876SArnaldo Carvalho de Melo unsigned char *value; 681c14ac0aSArnaldo Carvalho de Melo u32 elapsed_time; 6976fd1e87SGerrit Renker __be32 opt_val; 70afe00251SAndrea Bittau int rc; 71afe00251SAndrea Bittau int mandatory = 0; 727c657876SArnaldo Carvalho de Melo 737c657876SArnaldo Carvalho de Melo memset(opt_recv, 0, sizeof(*opt_recv)); 747c657876SArnaldo Carvalho de Melo 75fb950496SDavid S. Miller opt = len = 0; 767c657876SArnaldo Carvalho de Melo while (opt_ptr != opt_end) { 777c657876SArnaldo Carvalho de Melo opt = *opt_ptr++; 787c657876SArnaldo Carvalho de Melo len = 0; 797c657876SArnaldo Carvalho de Melo value = NULL; 807c657876SArnaldo Carvalho de Melo 817c657876SArnaldo Carvalho de Melo /* Check if this isn't a single byte option */ 827c657876SArnaldo Carvalho de Melo if (opt > DCCPO_MAX_RESERVED) { 837c657876SArnaldo Carvalho de Melo if (opt_ptr == opt_end) 847c657876SArnaldo Carvalho de Melo goto out_invalid_option; 857c657876SArnaldo Carvalho de Melo 867c657876SArnaldo Carvalho de Melo len = *opt_ptr++; 877c657876SArnaldo Carvalho de Melo if (len < 3) 887c657876SArnaldo Carvalho de Melo goto out_invalid_option; 897c657876SArnaldo Carvalho de Melo /* 907c657876SArnaldo Carvalho de Melo * Remove the type and len fields, leaving 917c657876SArnaldo Carvalho de Melo * just the value size 927c657876SArnaldo Carvalho de Melo */ 937c657876SArnaldo Carvalho de Melo len -= 2; 947c657876SArnaldo Carvalho de Melo value = opt_ptr; 957c657876SArnaldo Carvalho de Melo opt_ptr += len; 967c657876SArnaldo Carvalho de Melo 977c657876SArnaldo Carvalho de Melo if (opt_ptr > opt_end) 987c657876SArnaldo Carvalho de Melo goto out_invalid_option; 997c657876SArnaldo Carvalho de Melo } 1007c657876SArnaldo Carvalho de Melo 1018b819412SGerrit Renker /* 1028b819412SGerrit Renker * CCID-Specific Options (from RFC 4340, sec. 10.3): 1038b819412SGerrit Renker * 1048b819412SGerrit Renker * Option numbers 128 through 191 are for options sent from the 1058b819412SGerrit Renker * HC-Sender to the HC-Receiver; option numbers 192 through 255 1068b819412SGerrit Renker * are for options sent from the HC-Receiver to the HC-Sender. 1078b819412SGerrit Renker * 1088b819412SGerrit Renker * CCID-specific options are ignored during connection setup, as 1098b819412SGerrit Renker * negotiation may still be in progress (see RFC 4340, 10.3). 11065907a43SGerrit Renker * The same applies to Ack Vectors, as these depend on the CCID. 1118b819412SGerrit Renker * 1128b819412SGerrit Renker */ 11365907a43SGerrit Renker if (dreq != NULL && (opt >= 128 || 11465907a43SGerrit Renker opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1)) 1158b819412SGerrit Renker goto ignore_option; 1168b819412SGerrit Renker 1177c657876SArnaldo Carvalho de Melo switch (opt) { 1187c657876SArnaldo Carvalho de Melo case DCCPO_PADDING: 1197c657876SArnaldo Carvalho de Melo break; 120afe00251SAndrea Bittau case DCCPO_MANDATORY: 121afe00251SAndrea Bittau if (mandatory) 122afe00251SAndrea Bittau goto out_invalid_option; 1236df9424aSArnaldo Carvalho de Melo if (pkt_type != DCCP_PKT_DATA) 124afe00251SAndrea Bittau mandatory = 1; 125afe00251SAndrea Bittau break; 1267c657876SArnaldo Carvalho de Melo case DCCPO_NDP_COUNT: 127*5b5d0e70SGerrit Renker if (len > 6) 1287c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1297c657876SArnaldo Carvalho de Melo 1307c657876SArnaldo Carvalho de Melo opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); 131*5b5d0e70SGerrit Renker dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk), 132*5b5d0e70SGerrit Renker (unsigned long long)opt_recv->dccpor_ndp); 1337c657876SArnaldo Carvalho de Melo break; 134afe00251SAndrea Bittau case DCCPO_CHANGE_L: 135afe00251SAndrea Bittau /* fall through */ 136afe00251SAndrea Bittau case DCCPO_CHANGE_R: 137cf86314cSGerrit Renker if (pkt_type == DCCP_PKT_DATA) 138cf86314cSGerrit Renker break; 139afe00251SAndrea Bittau if (len < 2) 140afe00251SAndrea Bittau goto out_invalid_option; 141afe00251SAndrea Bittau rc = dccp_feat_change_recv(sk, opt, *value, value + 1, 142afe00251SAndrea Bittau len - 1); 143afe00251SAndrea Bittau /* 144afe00251SAndrea Bittau * When there is a change error, change_recv is 145afe00251SAndrea Bittau * responsible for dealing with it. i.e. reply with an 146afe00251SAndrea Bittau * empty confirm. 147afe00251SAndrea Bittau * If the change was mandatory, then we need to die. 148afe00251SAndrea Bittau */ 149afe00251SAndrea Bittau if (rc && mandatory) 150afe00251SAndrea Bittau goto out_invalid_option; 151afe00251SAndrea Bittau break; 152afe00251SAndrea Bittau case DCCPO_CONFIRM_L: 153afe00251SAndrea Bittau /* fall through */ 154afe00251SAndrea Bittau case DCCPO_CONFIRM_R: 155cf86314cSGerrit Renker if (pkt_type == DCCP_PKT_DATA) 156cf86314cSGerrit Renker break; 157cf86314cSGerrit Renker if (len < 2) /* FIXME this disallows empty confirm */ 158afe00251SAndrea Bittau goto out_invalid_option; 159afe00251SAndrea Bittau if (dccp_feat_confirm_recv(sk, opt, *value, 160afe00251SAndrea Bittau value + 1, len - 1)) 161afe00251SAndrea Bittau goto out_invalid_option; 162afe00251SAndrea Bittau break; 1637c657876SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_0: 164ae31c339SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_1: 165c86ab2b6SGerrit Renker if (dccp_packet_without_ack(skb)) /* RFC 4340, 11.4 */ 166e5a6de91SArnaldo Carvalho de Melo break; 1677c657876SArnaldo Carvalho de Melo 168a4bf3902SArnaldo Carvalho de Melo if (dccp_msk(sk)->dccpms_send_ack_vector && 169bdf13d20SAndrea Bittau dccp_ackvec_parse(sk, skb, &ackno, opt, value, len)) 170ae31c339SArnaldo Carvalho de Melo goto out_invalid_option; 1717c657876SArnaldo Carvalho de Melo break; 1727c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP: 1737c657876SArnaldo Carvalho de Melo if (len != 4) 1747c657876SArnaldo Carvalho de Melo goto out_invalid_option; 175b4d4f7c7SGerrit Renker /* 176b4d4f7c7SGerrit Renker * RFC 4340 13.1: "The precise time corresponding to 177b4d4f7c7SGerrit Renker * Timestamp Value zero is not specified". We use 178b4d4f7c7SGerrit Renker * zero to indicate absence of a meaningful timestamp. 179b4d4f7c7SGerrit Renker */ 18076fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 181b4d4f7c7SGerrit Renker if (unlikely(opt_val == 0)) { 182b4d4f7c7SGerrit Renker DCCP_WARN("Timestamp with zero value\n"); 183b4d4f7c7SGerrit Renker break; 184b4d4f7c7SGerrit Renker } 1857c657876SArnaldo Carvalho de Melo 186b4d4f7c7SGerrit Renker if (dreq != NULL) { 187b4d4f7c7SGerrit Renker dreq->dreq_timestamp_echo = ntohl(opt_val); 188b4d4f7c7SGerrit Renker dreq->dreq_timestamp_time = dccp_timestamp(); 189b4d4f7c7SGerrit Renker } else { 190b4d4f7c7SGerrit Renker opt_recv->dccpor_timestamp = 191b4d4f7c7SGerrit Renker dp->dccps_timestamp_echo = ntohl(opt_val); 192b4d4f7c7SGerrit Renker dp->dccps_timestamp_time = dccp_timestamp(); 193b4d4f7c7SGerrit Renker } 19409dbc389SGerrit Renker dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", 195b4d4f7c7SGerrit Renker dccp_role(sk), ntohl(opt_val), 196f6ccf554SDavid S. Miller (unsigned long long) 1977c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 1987c657876SArnaldo Carvalho de Melo break; 1997c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP_ECHO: 2001bc09869SIan McDonald if (len != 4 && len != 6 && len != 8) 2017c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2027c657876SArnaldo Carvalho de Melo 20376fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 20476fd1e87SGerrit Renker opt_recv->dccpor_timestamp_echo = ntohl(opt_val); 2057c657876SArnaldo Carvalho de Melo 20609dbc389SGerrit Renker dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " 207f73f7097SGerrit Renker "ackno=%llu", dccp_role(sk), 2087690af3fSArnaldo Carvalho de Melo opt_recv->dccpor_timestamp_echo, 209f6ccf554SDavid S. Miller len + 2, 210f6ccf554SDavid S. Miller (unsigned long long) 2111bc09869SIan McDonald DCCP_SKB_CB(skb)->dccpd_ack_seq); 2127c657876SArnaldo Carvalho de Melo 21376fd1e87SGerrit Renker value += 4; 2141bc09869SIan McDonald 21576fd1e87SGerrit Renker if (len == 4) { /* no elapsed time included */ 216f73f7097SGerrit Renker dccp_pr_debug_cat("\n"); 2171c14ac0aSArnaldo Carvalho de Melo break; 218f73f7097SGerrit Renker } 2191c14ac0aSArnaldo Carvalho de Melo 22076fd1e87SGerrit Renker if (len == 6) { /* 2-byte elapsed time */ 22176fd1e87SGerrit Renker __be16 opt_val2 = get_unaligned((__be16 *)value); 22276fd1e87SGerrit Renker elapsed_time = ntohs(opt_val2); 22376fd1e87SGerrit Renker } else { /* 4-byte elapsed time */ 22476fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 22576fd1e87SGerrit Renker elapsed_time = ntohl(opt_val); 22676fd1e87SGerrit Renker } 2271c14ac0aSArnaldo Carvalho de Melo 228dcad856fSGerrit Renker dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time); 229f73f7097SGerrit Renker 2301c14ac0aSArnaldo Carvalho de Melo /* Give precedence to the biggest ELAPSED_TIME */ 2311c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 2321c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 2337c657876SArnaldo Carvalho de Melo break; 2347c657876SArnaldo Carvalho de Melo case DCCPO_ELAPSED_TIME: 235c86ab2b6SGerrit Renker if (dccp_packet_without_ack(skb)) /* RFC 4340, 13.2 */ 236c86ab2b6SGerrit Renker break; 2371bc09869SIan McDonald 23876fd1e87SGerrit Renker if (len == 2) { 23976fd1e87SGerrit Renker __be16 opt_val2 = get_unaligned((__be16 *)value); 24076fd1e87SGerrit Renker elapsed_time = ntohs(opt_val2); 241c86ab2b6SGerrit Renker } else if (len == 4) { 24276fd1e87SGerrit Renker opt_val = get_unaligned((__be32 *)value); 24376fd1e87SGerrit Renker elapsed_time = ntohl(opt_val); 244c86ab2b6SGerrit Renker } else { 245c86ab2b6SGerrit Renker goto out_invalid_option; 24676fd1e87SGerrit Renker } 2471c14ac0aSArnaldo Carvalho de Melo 2481c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 2491c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 2501bc09869SIan McDonald 25109dbc389SGerrit Renker dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", 25209dbc389SGerrit Renker dccp_role(sk), elapsed_time); 2537c657876SArnaldo Carvalho de Melo break; 2547c657876SArnaldo Carvalho de Melo case 128 ... 191: { 2557c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2567c657876SArnaldo Carvalho de Melo 2577690af3fSArnaldo Carvalho de Melo if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, 2587690af3fSArnaldo Carvalho de Melo opt, len, idx, 2597690af3fSArnaldo Carvalho de Melo value) != 0) 2607c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2617c657876SArnaldo Carvalho de Melo } 2627c657876SArnaldo Carvalho de Melo break; 2637c657876SArnaldo Carvalho de Melo case 192 ... 255: { 2647c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2657c657876SArnaldo Carvalho de Melo 2667690af3fSArnaldo Carvalho de Melo if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, 2677690af3fSArnaldo Carvalho de Melo opt, len, idx, 2687690af3fSArnaldo Carvalho de Melo value) != 0) 2697c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2707c657876SArnaldo Carvalho de Melo } 2717c657876SArnaldo Carvalho de Melo break; 2727c657876SArnaldo Carvalho de Melo default: 27359348b19SGerrit Renker DCCP_CRIT("DCCP(%p): option %d(len=%d) not " 27459348b19SGerrit Renker "implemented, ignoring", sk, opt, len); 2757c657876SArnaldo Carvalho de Melo break; 2767c657876SArnaldo Carvalho de Melo } 2778b819412SGerrit Renker ignore_option: 278afe00251SAndrea Bittau if (opt != DCCPO_MANDATORY) 279afe00251SAndrea Bittau mandatory = 0; 2807c657876SArnaldo Carvalho de Melo } 2817c657876SArnaldo Carvalho de Melo 2826df9424aSArnaldo Carvalho de Melo /* mandatory was the last byte in option list -> reset connection */ 2836df9424aSArnaldo Carvalho de Melo if (mandatory) 2846df9424aSArnaldo Carvalho de Melo goto out_invalid_option; 2856df9424aSArnaldo Carvalho de Melo 2867c657876SArnaldo Carvalho de Melo return 0; 2877c657876SArnaldo Carvalho de Melo 2887c657876SArnaldo Carvalho de Melo out_invalid_option: 2897c657876SArnaldo Carvalho de Melo DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); 2907c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; 29159348b19SGerrit Renker DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len); 2927c657876SArnaldo Carvalho de Melo return -1; 2937c657876SArnaldo Carvalho de Melo } 2947c657876SArnaldo Carvalho de Melo 295b61fafc4SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_parse_options); 296b61fafc4SArnaldo Carvalho de Melo 2977c657876SArnaldo Carvalho de Melo static void dccp_encode_value_var(const u32 value, unsigned char *to, 2987c657876SArnaldo Carvalho de Melo const unsigned int len) 2997c657876SArnaldo Carvalho de Melo { 3007c657876SArnaldo Carvalho de Melo if (len > 3) 3017c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF000000) >> 24; 3027c657876SArnaldo Carvalho de Melo if (len > 2) 3037c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF0000) >> 16; 3047c657876SArnaldo Carvalho de Melo if (len > 1) 3057c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF00) >> 8; 3067c657876SArnaldo Carvalho de Melo if (len > 0) 3077c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF); 3087c657876SArnaldo Carvalho de Melo } 3097c657876SArnaldo Carvalho de Melo 310*5b5d0e70SGerrit Renker static inline u8 dccp_ndp_len(const u64 ndp) 3117c657876SArnaldo Carvalho de Melo { 312*5b5d0e70SGerrit Renker if (likely(ndp <= 0xFF)) 313*5b5d0e70SGerrit Renker return 1; 314*5b5d0e70SGerrit Renker return likely(ndp <= USHORT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6); 3157c657876SArnaldo Carvalho de Melo } 3167c657876SArnaldo Carvalho de Melo 3172d0817d1SArnaldo Carvalho de Melo int dccp_insert_option(struct sock *sk, struct sk_buff *skb, 3187c657876SArnaldo Carvalho de Melo const unsigned char option, 3197c657876SArnaldo Carvalho de Melo const void *value, const unsigned char len) 3207c657876SArnaldo Carvalho de Melo { 3217c657876SArnaldo Carvalho de Melo unsigned char *to; 3227c657876SArnaldo Carvalho de Melo 3232d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) 3242d0817d1SArnaldo Carvalho de Melo return -1; 3257c657876SArnaldo Carvalho de Melo 3267c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; 3277c657876SArnaldo Carvalho de Melo 3287c657876SArnaldo Carvalho de Melo to = skb_push(skb, len + 2); 3297c657876SArnaldo Carvalho de Melo *to++ = option; 3307c657876SArnaldo Carvalho de Melo *to++ = len + 2; 3317c657876SArnaldo Carvalho de Melo 3327c657876SArnaldo Carvalho de Melo memcpy(to, value, len); 3332d0817d1SArnaldo Carvalho de Melo return 0; 3347c657876SArnaldo Carvalho de Melo } 3357c657876SArnaldo Carvalho de Melo 3367c657876SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option); 3377c657876SArnaldo Carvalho de Melo 3382d0817d1SArnaldo Carvalho de Melo static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) 3397c657876SArnaldo Carvalho de Melo { 3407c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 341*5b5d0e70SGerrit Renker u64 ndp = dp->dccps_ndp_count; 3427c657876SArnaldo Carvalho de Melo 3437c657876SArnaldo Carvalho de Melo if (dccp_non_data_packet(skb)) 3447c657876SArnaldo Carvalho de Melo ++dp->dccps_ndp_count; 3457c657876SArnaldo Carvalho de Melo else 3467c657876SArnaldo Carvalho de Melo dp->dccps_ndp_count = 0; 3477c657876SArnaldo Carvalho de Melo 3487c657876SArnaldo Carvalho de Melo if (ndp > 0) { 3497c657876SArnaldo Carvalho de Melo unsigned char *ptr; 3507c657876SArnaldo Carvalho de Melo const int ndp_len = dccp_ndp_len(ndp); 3517c657876SArnaldo Carvalho de Melo const int len = ndp_len + 2; 3527c657876SArnaldo Carvalho de Melo 3537c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 3542d0817d1SArnaldo Carvalho de Melo return -1; 3557c657876SArnaldo Carvalho de Melo 3567c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3577c657876SArnaldo Carvalho de Melo 3587c657876SArnaldo Carvalho de Melo ptr = skb_push(skb, len); 3597c657876SArnaldo Carvalho de Melo *ptr++ = DCCPO_NDP_COUNT; 3607c657876SArnaldo Carvalho de Melo *ptr++ = len; 3617c657876SArnaldo Carvalho de Melo dccp_encode_value_var(ndp, ptr, ndp_len); 3627c657876SArnaldo Carvalho de Melo } 3632d0817d1SArnaldo Carvalho de Melo 3642d0817d1SArnaldo Carvalho de Melo return 0; 3657c657876SArnaldo Carvalho de Melo } 3667c657876SArnaldo Carvalho de Melo 3677c657876SArnaldo Carvalho de Melo static inline int dccp_elapsed_time_len(const u32 elapsed_time) 3687c657876SArnaldo Carvalho de Melo { 369b1c9fe7bSIan McDonald return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; 3707c657876SArnaldo Carvalho de Melo } 3717c657876SArnaldo Carvalho de Melo 3722d0817d1SArnaldo Carvalho de Melo int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, 3737c657876SArnaldo Carvalho de Melo u32 elapsed_time) 3747c657876SArnaldo Carvalho de Melo { 3757c657876SArnaldo Carvalho de Melo const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 3767c657876SArnaldo Carvalho de Melo const int len = 2 + elapsed_time_len; 3777c657876SArnaldo Carvalho de Melo unsigned char *to; 3787c657876SArnaldo Carvalho de Melo 3791bc09869SIan McDonald if (elapsed_time_len == 0) 3802d0817d1SArnaldo Carvalho de Melo return 0; 3817c657876SArnaldo Carvalho de Melo 3822d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 3832d0817d1SArnaldo Carvalho de Melo return -1; 3847c657876SArnaldo Carvalho de Melo 3857c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3867c657876SArnaldo Carvalho de Melo 3877c657876SArnaldo Carvalho de Melo to = skb_push(skb, len); 3887c657876SArnaldo Carvalho de Melo *to++ = DCCPO_ELAPSED_TIME; 3897c657876SArnaldo Carvalho de Melo *to++ = len; 3907c657876SArnaldo Carvalho de Melo 3911bc09869SIan McDonald if (elapsed_time_len == 2) { 39260fe62e7SAndrea Bittau const __be16 var16 = htons((u16)elapsed_time); 3931bc09869SIan McDonald memcpy(to, &var16, 2); 3941bc09869SIan McDonald } else { 39560fe62e7SAndrea Bittau const __be32 var32 = htonl(elapsed_time); 3961bc09869SIan McDonald memcpy(to, &var32, 4); 3971bc09869SIan McDonald } 3987c657876SArnaldo Carvalho de Melo 3992d0817d1SArnaldo Carvalho de Melo return 0; 4007c657876SArnaldo Carvalho de Melo } 4017c657876SArnaldo Carvalho de Melo 402d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); 4037c657876SArnaldo Carvalho de Melo 4042d0817d1SArnaldo Carvalho de Melo int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) 4057c657876SArnaldo Carvalho de Melo { 4064c70f383SGerrit Renker __be32 now = htonl(dccp_timestamp()); 4071bc09869SIan McDonald /* yes this will overflow but that is the point as we want a 4081bc09869SIan McDonald * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ 4091bc09869SIan McDonald 4102d0817d1SArnaldo Carvalho de Melo return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); 4117c657876SArnaldo Carvalho de Melo } 4127c657876SArnaldo Carvalho de Melo 413d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); 414d4b81ff7SArnaldo Carvalho de Melo 415b4d4f7c7SGerrit Renker static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp, 416b4d4f7c7SGerrit Renker struct dccp_request_sock *dreq, 4177690af3fSArnaldo Carvalho de Melo struct sk_buff *skb) 4187c657876SArnaldo Carvalho de Melo { 41960fe62e7SAndrea Bittau __be32 tstamp_echo; 4207c657876SArnaldo Carvalho de Melo unsigned char *to; 421b4d4f7c7SGerrit Renker u32 elapsed_time, elapsed_time_len, len; 422b4d4f7c7SGerrit Renker 423b4d4f7c7SGerrit Renker if (dreq != NULL) { 424b4d4f7c7SGerrit Renker elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time; 425b4d4f7c7SGerrit Renker tstamp_echo = htonl(dreq->dreq_timestamp_echo); 426b4d4f7c7SGerrit Renker dreq->dreq_timestamp_echo = 0; 427b4d4f7c7SGerrit Renker } else { 428b4d4f7c7SGerrit Renker elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time; 429b4d4f7c7SGerrit Renker tstamp_echo = htonl(dp->dccps_timestamp_echo); 430b4d4f7c7SGerrit Renker dp->dccps_timestamp_echo = 0; 431b4d4f7c7SGerrit Renker } 432b4d4f7c7SGerrit Renker 433b0e56780SArnaldo Carvalho de Melo elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 434b0e56780SArnaldo Carvalho de Melo len = 6 + elapsed_time_len; 435b0e56780SArnaldo Carvalho de Melo 4362d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 4372d0817d1SArnaldo Carvalho de Melo return -1; 4387c657876SArnaldo Carvalho de Melo 4397c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 4407c657876SArnaldo Carvalho de Melo 4417c657876SArnaldo Carvalho de Melo to = skb_push(skb, len); 4427c657876SArnaldo Carvalho de Melo *to++ = DCCPO_TIMESTAMP_ECHO; 4437c657876SArnaldo Carvalho de Melo *to++ = len; 4447c657876SArnaldo Carvalho de Melo 4457c657876SArnaldo Carvalho de Melo memcpy(to, &tstamp_echo, 4); 4467c657876SArnaldo Carvalho de Melo to += 4; 4471bc09869SIan McDonald 4481bc09869SIan McDonald if (elapsed_time_len == 2) { 44960fe62e7SAndrea Bittau const __be16 var16 = htons((u16)elapsed_time); 4501bc09869SIan McDonald memcpy(to, &var16, 2); 4511bc09869SIan McDonald } else if (elapsed_time_len == 4) { 45260fe62e7SAndrea Bittau const __be32 var32 = htonl(elapsed_time); 4531bc09869SIan McDonald memcpy(to, &var32, 4); 4541bc09869SIan McDonald } 4557c657876SArnaldo Carvalho de Melo 4562d0817d1SArnaldo Carvalho de Melo return 0; 4577c657876SArnaldo Carvalho de Melo } 4587c657876SArnaldo Carvalho de Melo 459afe00251SAndrea Bittau static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, 460afe00251SAndrea Bittau u8 *val, u8 len) 461afe00251SAndrea Bittau { 462afe00251SAndrea Bittau u8 *to; 463afe00251SAndrea Bittau 464afe00251SAndrea Bittau if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { 46559348b19SGerrit Renker DCCP_WARN("packet too small for feature %d option!\n", feat); 466afe00251SAndrea Bittau return -1; 467afe00251SAndrea Bittau } 468afe00251SAndrea Bittau 469afe00251SAndrea Bittau DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; 470afe00251SAndrea Bittau 471afe00251SAndrea Bittau to = skb_push(skb, len + 3); 472afe00251SAndrea Bittau *to++ = type; 473afe00251SAndrea Bittau *to++ = len + 3; 474afe00251SAndrea Bittau *to++ = feat; 475afe00251SAndrea Bittau 476afe00251SAndrea Bittau if (len) 477afe00251SAndrea Bittau memcpy(to, val, len); 478afe00251SAndrea Bittau 479c02fdc0eSGerrit Renker dccp_pr_debug("%s(%s (%d), ...), length %d\n", 480c02fdc0eSGerrit Renker dccp_feat_typename(type), 481c02fdc0eSGerrit Renker dccp_feat_name(feat), feat, len); 482afe00251SAndrea Bittau return 0; 483afe00251SAndrea Bittau } 484afe00251SAndrea Bittau 4852d0817d1SArnaldo Carvalho de Melo static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) 486afe00251SAndrea Bittau { 487afe00251SAndrea Bittau struct dccp_sock *dp = dccp_sk(sk); 488a4bf3902SArnaldo Carvalho de Melo struct dccp_minisock *dmsk = dccp_msk(sk); 489afe00251SAndrea Bittau struct dccp_opt_pend *opt, *next; 490afe00251SAndrea Bittau int change = 0; 491afe00251SAndrea Bittau 492afe00251SAndrea Bittau /* confirm any options [NN opts] */ 493a4bf3902SArnaldo Carvalho de Melo list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { 494afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 495afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 496afe00251SAndrea Bittau opt->dccpop_len); 497afe00251SAndrea Bittau /* fear empty confirms */ 498afe00251SAndrea Bittau if (opt->dccpop_val) 499afe00251SAndrea Bittau kfree(opt->dccpop_val); 500afe00251SAndrea Bittau kfree(opt); 501afe00251SAndrea Bittau } 502a4bf3902SArnaldo Carvalho de Melo INIT_LIST_HEAD(&dmsk->dccpms_conf); 503afe00251SAndrea Bittau 504afe00251SAndrea Bittau /* see which features we need to send */ 505a4bf3902SArnaldo Carvalho de Melo list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { 506afe00251SAndrea Bittau /* see if we need to send any confirm */ 507afe00251SAndrea Bittau if (opt->dccpop_sc) { 508afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type + 1, 509afe00251SAndrea Bittau opt->dccpop_feat, 510afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_val, 511afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_len); 512afe00251SAndrea Bittau 513afe00251SAndrea Bittau BUG_ON(!opt->dccpop_sc->dccpoc_val); 514afe00251SAndrea Bittau kfree(opt->dccpop_sc->dccpoc_val); 515afe00251SAndrea Bittau kfree(opt->dccpop_sc); 516afe00251SAndrea Bittau opt->dccpop_sc = NULL; 517afe00251SAndrea Bittau } 518afe00251SAndrea Bittau 519afe00251SAndrea Bittau /* any option not confirmed, re-send it */ 520afe00251SAndrea Bittau if (!opt->dccpop_conf) { 521afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 522afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 523afe00251SAndrea Bittau opt->dccpop_len); 524afe00251SAndrea Bittau change++; 525afe00251SAndrea Bittau } 526afe00251SAndrea Bittau } 527afe00251SAndrea Bittau 528afe00251SAndrea Bittau /* Retransmit timer. 529afe00251SAndrea Bittau * If this is the master listening sock, we don't set a timer on it. It 530afe00251SAndrea Bittau * should be fine because if the dude doesn't receive our RESPONSE 531afe00251SAndrea Bittau * [which will contain the CHANGE] he will send another REQUEST which 532afe00251SAndrea Bittau * will "retrnasmit" the change. 533afe00251SAndrea Bittau */ 534afe00251SAndrea Bittau if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { 535afe00251SAndrea Bittau dccp_pr_debug("reset feat negotiation timer %p\n", sk); 536afe00251SAndrea Bittau 537afe00251SAndrea Bittau /* XXX don't reset the timer on re-transmissions. I.e. reset it 538afe00251SAndrea Bittau * only when sending new stuff i guess. Currently the timer 539afe00251SAndrea Bittau * never backs off because on re-transmission it just resets it! 540afe00251SAndrea Bittau */ 541afe00251SAndrea Bittau inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, 542afe00251SAndrea Bittau inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); 543afe00251SAndrea Bittau } 5442d0817d1SArnaldo Carvalho de Melo 5452d0817d1SArnaldo Carvalho de Melo return 0; 546afe00251SAndrea Bittau } 547afe00251SAndrea Bittau 548af3b867eSGerrit Renker /* The length of all options needs to be a multiple of 4 (5.8) */ 549af3b867eSGerrit Renker static void dccp_insert_option_padding(struct sk_buff *skb) 550af3b867eSGerrit Renker { 551af3b867eSGerrit Renker int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; 552af3b867eSGerrit Renker 553af3b867eSGerrit Renker if (padding != 0) { 554af3b867eSGerrit Renker padding = 4 - padding; 555af3b867eSGerrit Renker memset(skb_push(skb, padding), 0, padding); 556af3b867eSGerrit Renker DCCP_SKB_CB(skb)->dccpd_opt_len += padding; 557af3b867eSGerrit Renker } 558af3b867eSGerrit Renker } 559af3b867eSGerrit Renker 5602d0817d1SArnaldo Carvalho de Melo int dccp_insert_options(struct sock *sk, struct sk_buff *skb) 5617c657876SArnaldo Carvalho de Melo { 5627c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 563a4bf3902SArnaldo Carvalho de Melo struct dccp_minisock *dmsk = dccp_msk(sk); 5647c657876SArnaldo Carvalho de Melo 5657c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len = 0; 5667c657876SArnaldo Carvalho de Melo 567a4bf3902SArnaldo Carvalho de Melo if (dmsk->dccpms_send_ndp_count && 5682d0817d1SArnaldo Carvalho de Melo dccp_insert_option_ndp(sk, skb)) 5692d0817d1SArnaldo Carvalho de Melo return -1; 5707c657876SArnaldo Carvalho de Melo 5717c657876SArnaldo Carvalho de Melo if (!dccp_packet_without_ack(skb)) { 572a4bf3902SArnaldo Carvalho de Melo if (dmsk->dccpms_send_ack_vector && 5732d0817d1SArnaldo Carvalho de Melo dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && 5742d0817d1SArnaldo Carvalho de Melo dccp_insert_option_ackvec(sk, skb)) 5752d0817d1SArnaldo Carvalho de Melo return -1; 5767c657876SArnaldo Carvalho de Melo } 5777c657876SArnaldo Carvalho de Melo 578507d37cfSArnaldo Carvalho de Melo if (dp->dccps_hc_rx_insert_options) { 5792d0817d1SArnaldo Carvalho de Melo if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) 5802d0817d1SArnaldo Carvalho de Melo return -1; 581507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 0; 582507d37cfSArnaldo Carvalho de Melo } 5837c657876SArnaldo Carvalho de Melo 584afe00251SAndrea Bittau /* Feature negotiation */ 585afe00251SAndrea Bittau /* Data packets can't do feat negotiation */ 5862d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && 5872d0817d1SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && 5882d0817d1SArnaldo Carvalho de Melo dccp_insert_options_feat(sk, skb)) 5892d0817d1SArnaldo Carvalho de Melo return -1; 590afe00251SAndrea Bittau 59189560b53SGerrit Renker /* 59289560b53SGerrit Renker * Obtain RTT sample from Request/Response exchange. 59389560b53SGerrit Renker * This is currently used in CCID 3 initialisation. 59489560b53SGerrit Renker */ 59589560b53SGerrit Renker if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST && 59689560b53SGerrit Renker dccp_insert_option_timestamp(sk, skb)) 59789560b53SGerrit Renker return -1; 59889560b53SGerrit Renker 599b4d4f7c7SGerrit Renker if (dp->dccps_timestamp_echo != 0 && 600b4d4f7c7SGerrit Renker dccp_insert_option_timestamp_echo(dp, NULL, skb)) 601b4d4f7c7SGerrit Renker return -1; 602b4d4f7c7SGerrit Renker 603af3b867eSGerrit Renker dccp_insert_option_padding(skb); 604af3b867eSGerrit Renker return 0; 6057c657876SArnaldo Carvalho de Melo } 6062d0817d1SArnaldo Carvalho de Melo 607af3b867eSGerrit Renker int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb) 608af3b867eSGerrit Renker { 609af3b867eSGerrit Renker DCCP_SKB_CB(skb)->dccpd_opt_len = 0; 610af3b867eSGerrit Renker 611af3b867eSGerrit Renker if (dreq->dreq_timestamp_echo != 0 && 612af3b867eSGerrit Renker dccp_insert_option_timestamp_echo(NULL, dreq, skb)) 613af3b867eSGerrit Renker return -1; 614af3b867eSGerrit Renker 615af3b867eSGerrit Renker dccp_insert_option_padding(skb); 6162d0817d1SArnaldo Carvalho de Melo return 0; 6177c657876SArnaldo Carvalho de Melo } 618