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> 71bc09869SIan McDonald * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.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/config.h> 157c657876SArnaldo Carvalho de Melo #include <linux/dccp.h> 167c657876SArnaldo Carvalho de Melo #include <linux/module.h> 177c657876SArnaldo Carvalho de Melo #include <linux/types.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 26e55d912fSArnaldo Carvalho de Melo int dccp_feat_default_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; 27e55d912fSArnaldo Carvalho de Melo int dccp_feat_default_rx_ccid = DCCPF_INITIAL_CCID; 28e55d912fSArnaldo Carvalho de Melo int dccp_feat_default_tx_ccid = DCCPF_INITIAL_CCID; 29e55d912fSArnaldo Carvalho de Melo int dccp_feat_default_ack_ratio = DCCPF_INITIAL_ACK_RATIO; 30e55d912fSArnaldo Carvalho de Melo int dccp_feat_default_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; 31e55d912fSArnaldo Carvalho de Melo int dccp_feat_default_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; 327c657876SArnaldo Carvalho de Melo 337c657876SArnaldo Carvalho de Melo void dccp_options_init(struct dccp_options *dccpo) 347c657876SArnaldo Carvalho de Melo { 35e55d912fSArnaldo Carvalho de Melo dccpo->dccpo_sequence_window = dccp_feat_default_sequence_window; 36e55d912fSArnaldo Carvalho de Melo dccpo->dccpo_rx_ccid = dccp_feat_default_rx_ccid; 37e55d912fSArnaldo Carvalho de Melo dccpo->dccpo_tx_ccid = dccp_feat_default_tx_ccid; 38e55d912fSArnaldo Carvalho de Melo dccpo->dccpo_ack_ratio = dccp_feat_default_ack_ratio; 39e55d912fSArnaldo Carvalho de Melo dccpo->dccpo_send_ack_vector = dccp_feat_default_send_ack_vector; 40e55d912fSArnaldo Carvalho de Melo dccpo->dccpo_send_ndp_count = dccp_feat_default_send_ndp_count; 417c657876SArnaldo Carvalho de Melo } 427c657876SArnaldo Carvalho de Melo 437c657876SArnaldo Carvalho de Melo static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) 447c657876SArnaldo Carvalho de Melo { 457c657876SArnaldo Carvalho de Melo u32 value = 0; 467c657876SArnaldo Carvalho de Melo 477c657876SArnaldo Carvalho de Melo if (len > 3) 487c657876SArnaldo Carvalho de Melo value += *bf++ << 24; 497c657876SArnaldo Carvalho de Melo if (len > 2) 507c657876SArnaldo Carvalho de Melo value += *bf++ << 16; 517c657876SArnaldo Carvalho de Melo if (len > 1) 527c657876SArnaldo Carvalho de Melo value += *bf++ << 8; 537c657876SArnaldo Carvalho de Melo if (len > 0) 547c657876SArnaldo Carvalho de Melo value += *bf; 557c657876SArnaldo Carvalho de Melo 567c657876SArnaldo Carvalho de Melo return value; 577c657876SArnaldo Carvalho de Melo } 587c657876SArnaldo Carvalho de Melo 597c657876SArnaldo Carvalho de Melo int dccp_parse_options(struct sock *sk, struct sk_buff *skb) 607c657876SArnaldo Carvalho de Melo { 617c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 62725ba8eeSArnaldo Carvalho de Melo #ifdef CONFIG_IP_DCCP_DEBUG 637690af3fSArnaldo Carvalho de Melo const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? 647690af3fSArnaldo Carvalho de Melo "CLIENT rx opt: " : "server rx opt: "; 657c657876SArnaldo Carvalho de Melo #endif 667c657876SArnaldo Carvalho de Melo const struct dccp_hdr *dh = dccp_hdr(skb); 677c657876SArnaldo Carvalho de Melo const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; 687c657876SArnaldo Carvalho de Melo unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); 697c657876SArnaldo Carvalho de Melo unsigned char *opt_ptr = options; 707690af3fSArnaldo Carvalho de Melo const unsigned char *opt_end = (unsigned char *)dh + 717690af3fSArnaldo Carvalho de Melo (dh->dccph_doff * 4); 727c657876SArnaldo Carvalho de Melo struct dccp_options_received *opt_recv = &dp->dccps_options_received; 737c657876SArnaldo Carvalho de Melo unsigned char opt, len; 747c657876SArnaldo Carvalho de Melo unsigned char *value; 751c14ac0aSArnaldo Carvalho de Melo u32 elapsed_time; 76afe00251SAndrea Bittau int rc; 77afe00251SAndrea Bittau int mandatory = 0; 787c657876SArnaldo Carvalho de Melo 797c657876SArnaldo Carvalho de Melo memset(opt_recv, 0, sizeof(*opt_recv)); 807c657876SArnaldo Carvalho de Melo 817c657876SArnaldo Carvalho de Melo while (opt_ptr != opt_end) { 827c657876SArnaldo Carvalho de Melo opt = *opt_ptr++; 837c657876SArnaldo Carvalho de Melo len = 0; 847c657876SArnaldo Carvalho de Melo value = NULL; 857c657876SArnaldo Carvalho de Melo 867c657876SArnaldo Carvalho de Melo /* Check if this isn't a single byte option */ 877c657876SArnaldo Carvalho de Melo if (opt > DCCPO_MAX_RESERVED) { 887c657876SArnaldo Carvalho de Melo if (opt_ptr == opt_end) 897c657876SArnaldo Carvalho de Melo goto out_invalid_option; 907c657876SArnaldo Carvalho de Melo 917c657876SArnaldo Carvalho de Melo len = *opt_ptr++; 927c657876SArnaldo Carvalho de Melo if (len < 3) 937c657876SArnaldo Carvalho de Melo goto out_invalid_option; 947c657876SArnaldo Carvalho de Melo /* 957c657876SArnaldo Carvalho de Melo * Remove the type and len fields, leaving 967c657876SArnaldo Carvalho de Melo * just the value size 977c657876SArnaldo Carvalho de Melo */ 987c657876SArnaldo Carvalho de Melo len -= 2; 997c657876SArnaldo Carvalho de Melo value = opt_ptr; 1007c657876SArnaldo Carvalho de Melo opt_ptr += len; 1017c657876SArnaldo Carvalho de Melo 1027c657876SArnaldo Carvalho de Melo if (opt_ptr > opt_end) 1037c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1047c657876SArnaldo Carvalho de Melo } 1057c657876SArnaldo Carvalho de Melo 1067c657876SArnaldo Carvalho de Melo switch (opt) { 1077c657876SArnaldo Carvalho de Melo case DCCPO_PADDING: 1087c657876SArnaldo Carvalho de Melo break; 109afe00251SAndrea Bittau case DCCPO_MANDATORY: 110afe00251SAndrea Bittau if (mandatory) 111afe00251SAndrea Bittau goto out_invalid_option; 112afe00251SAndrea Bittau mandatory = 1; 113afe00251SAndrea Bittau break; 1147c657876SArnaldo Carvalho de Melo case DCCPO_NDP_COUNT: 1157c657876SArnaldo Carvalho de Melo if (len > 3) 1167c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1177c657876SArnaldo Carvalho de Melo 1187c657876SArnaldo Carvalho de Melo opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); 1197690af3fSArnaldo Carvalho de Melo dccp_pr_debug("%sNDP count=%d\n", debug_prefix, 1207690af3fSArnaldo Carvalho de Melo opt_recv->dccpor_ndp); 1217c657876SArnaldo Carvalho de Melo break; 122afe00251SAndrea Bittau case DCCPO_CHANGE_L: 123afe00251SAndrea Bittau /* fall through */ 124afe00251SAndrea Bittau case DCCPO_CHANGE_R: 125afe00251SAndrea Bittau if (len < 2) 126afe00251SAndrea Bittau goto out_invalid_option; 127afe00251SAndrea Bittau rc = dccp_feat_change_recv(sk, opt, *value, value + 1, 128afe00251SAndrea Bittau len - 1); 129afe00251SAndrea Bittau /* 130afe00251SAndrea Bittau * When there is a change error, change_recv is 131afe00251SAndrea Bittau * responsible for dealing with it. i.e. reply with an 132afe00251SAndrea Bittau * empty confirm. 133afe00251SAndrea Bittau * If the change was mandatory, then we need to die. 134afe00251SAndrea Bittau */ 135afe00251SAndrea Bittau if (rc && mandatory) 136afe00251SAndrea Bittau goto out_invalid_option; 137afe00251SAndrea Bittau break; 138afe00251SAndrea Bittau case DCCPO_CONFIRM_L: 139afe00251SAndrea Bittau /* fall through */ 140afe00251SAndrea Bittau case DCCPO_CONFIRM_R: 141afe00251SAndrea Bittau if (len < 2) 142afe00251SAndrea Bittau goto out_invalid_option; 143afe00251SAndrea Bittau if (dccp_feat_confirm_recv(sk, opt, *value, 144afe00251SAndrea Bittau value + 1, len - 1)) 145afe00251SAndrea Bittau goto out_invalid_option; 146afe00251SAndrea Bittau break; 1477c657876SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_0: 148ae31c339SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_1: 1497c657876SArnaldo Carvalho de Melo if (pkt_type == DCCP_PKT_DATA) 1507c657876SArnaldo Carvalho de Melo continue; 1517c657876SArnaldo Carvalho de Melo 152ae31c339SArnaldo Carvalho de Melo if (dp->dccps_options.dccpo_send_ack_vector && 153ae31c339SArnaldo Carvalho de Melo dccp_ackvec_parse(sk, skb, opt, value, len)) 154ae31c339SArnaldo Carvalho de Melo goto out_invalid_option; 1557c657876SArnaldo Carvalho de Melo break; 1567c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP: 1577c657876SArnaldo Carvalho de Melo if (len != 4) 1587c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1597c657876SArnaldo Carvalho de Melo 16060fe62e7SAndrea Bittau opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); 1617c657876SArnaldo Carvalho de Melo 1627c657876SArnaldo Carvalho de Melo dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; 163b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &dp->dccps_timestamp_time); 1647c657876SArnaldo Carvalho de Melo 1657c657876SArnaldo Carvalho de Melo dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n", 1667c657876SArnaldo Carvalho de Melo debug_prefix, opt_recv->dccpor_timestamp, 167f6ccf554SDavid S. Miller (unsigned long long) 1687c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 1697c657876SArnaldo Carvalho de Melo break; 1707c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP_ECHO: 1711bc09869SIan McDonald if (len != 4 && len != 6 && len != 8) 1727c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1737c657876SArnaldo Carvalho de Melo 17460fe62e7SAndrea Bittau opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); 1757c657876SArnaldo Carvalho de Melo 1761bc09869SIan McDonald dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, ackno=%llu, ", 1777690af3fSArnaldo Carvalho de Melo debug_prefix, 1787690af3fSArnaldo Carvalho de Melo opt_recv->dccpor_timestamp_echo, 179f6ccf554SDavid S. Miller len + 2, 180f6ccf554SDavid S. Miller (unsigned long long) 1811bc09869SIan McDonald DCCP_SKB_CB(skb)->dccpd_ack_seq); 1827c657876SArnaldo Carvalho de Melo 1831bc09869SIan McDonald 1841c14ac0aSArnaldo Carvalho de Melo if (len == 4) 1851c14ac0aSArnaldo Carvalho de Melo break; 1861c14ac0aSArnaldo Carvalho de Melo 1871c14ac0aSArnaldo Carvalho de Melo if (len == 6) 18860fe62e7SAndrea Bittau elapsed_time = ntohs(*(__be16 *)(value + 4)); 1891c14ac0aSArnaldo Carvalho de Melo else 19060fe62e7SAndrea Bittau elapsed_time = ntohl(*(__be32 *)(value + 4)); 1911c14ac0aSArnaldo Carvalho de Melo 1921c14ac0aSArnaldo Carvalho de Melo /* Give precedence to the biggest ELAPSED_TIME */ 1931c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 1941c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 1957c657876SArnaldo Carvalho de Melo break; 1967c657876SArnaldo Carvalho de Melo case DCCPO_ELAPSED_TIME: 1971bc09869SIan McDonald if (len != 2 && len != 4) 1987c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1997c657876SArnaldo Carvalho de Melo 2007c657876SArnaldo Carvalho de Melo if (pkt_type == DCCP_PKT_DATA) 2017c657876SArnaldo Carvalho de Melo continue; 2021bc09869SIan McDonald 2031bc09869SIan McDonald if (len == 2) 20460fe62e7SAndrea Bittau elapsed_time = ntohs(*(__be16 *)value); 2051bc09869SIan McDonald else 20660fe62e7SAndrea Bittau elapsed_time = ntohl(*(__be32 *)value); 2071c14ac0aSArnaldo Carvalho de Melo 2081c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 2091c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 2101bc09869SIan McDonald 2117c657876SArnaldo Carvalho de Melo dccp_pr_debug("%sELAPSED_TIME=%d\n", debug_prefix, 2121c14ac0aSArnaldo Carvalho de Melo elapsed_time); 2137c657876SArnaldo Carvalho de Melo break; 2147c657876SArnaldo Carvalho de Melo /* 2157c657876SArnaldo Carvalho de Melo * From draft-ietf-dccp-spec-11.txt: 2167c657876SArnaldo Carvalho de Melo * 2177690af3fSArnaldo Carvalho de Melo * Option numbers 128 through 191 are for 2187690af3fSArnaldo Carvalho de Melo * options sent from the HC-Sender to the 2197690af3fSArnaldo Carvalho de Melo * HC-Receiver; option numbers 192 through 255 2207690af3fSArnaldo Carvalho de Melo * are for options sent from the HC-Receiver to 2217690af3fSArnaldo Carvalho de Melo * the HC-Sender. 2227c657876SArnaldo Carvalho de Melo */ 2237c657876SArnaldo Carvalho de Melo case 128 ... 191: { 2247c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2257c657876SArnaldo Carvalho de Melo 2267690af3fSArnaldo Carvalho de Melo if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, 2277690af3fSArnaldo Carvalho de Melo opt, len, idx, 2287690af3fSArnaldo Carvalho de Melo value) != 0) 2297c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2307c657876SArnaldo Carvalho de Melo } 2317c657876SArnaldo Carvalho de Melo break; 2327c657876SArnaldo Carvalho de Melo case 192 ... 255: { 2337c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2347c657876SArnaldo Carvalho de Melo 2357690af3fSArnaldo Carvalho de Melo if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, 2367690af3fSArnaldo Carvalho de Melo opt, len, idx, 2377690af3fSArnaldo Carvalho de Melo value) != 0) 2387c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2397c657876SArnaldo Carvalho de Melo } 2407c657876SArnaldo Carvalho de Melo break; 2417c657876SArnaldo Carvalho de Melo default: 2427690af3fSArnaldo Carvalho de Melo pr_info("DCCP(%p): option %d(len=%d) not " 2437690af3fSArnaldo Carvalho de Melo "implemented, ignoring\n", 2447c657876SArnaldo Carvalho de Melo sk, opt, len); 2457c657876SArnaldo Carvalho de Melo break; 2467c657876SArnaldo Carvalho de Melo } 247afe00251SAndrea Bittau 248afe00251SAndrea Bittau if (opt != DCCPO_MANDATORY) 249afe00251SAndrea Bittau mandatory = 0; 2507c657876SArnaldo Carvalho de Melo } 2517c657876SArnaldo Carvalho de Melo 2527c657876SArnaldo Carvalho de Melo return 0; 2537c657876SArnaldo Carvalho de Melo 2547c657876SArnaldo Carvalho de Melo out_invalid_option: 2557c657876SArnaldo Carvalho de Melo DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); 2567c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; 2577c657876SArnaldo Carvalho de Melo pr_info("DCCP(%p): invalid option %d, len=%d\n", sk, opt, len); 2587c657876SArnaldo Carvalho de Melo return -1; 2597c657876SArnaldo Carvalho de Melo } 2607c657876SArnaldo Carvalho de Melo 261*b61fafc4SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_parse_options); 262*b61fafc4SArnaldo Carvalho de Melo 2637c657876SArnaldo Carvalho de Melo static void dccp_encode_value_var(const u32 value, unsigned char *to, 2647c657876SArnaldo Carvalho de Melo const unsigned int len) 2657c657876SArnaldo Carvalho de Melo { 2667c657876SArnaldo Carvalho de Melo if (len > 3) 2677c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF000000) >> 24; 2687c657876SArnaldo Carvalho de Melo if (len > 2) 2697c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF0000) >> 16; 2707c657876SArnaldo Carvalho de Melo if (len > 1) 2717c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF00) >> 8; 2727c657876SArnaldo Carvalho de Melo if (len > 0) 2737c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF); 2747c657876SArnaldo Carvalho de Melo } 2757c657876SArnaldo Carvalho de Melo 2767c657876SArnaldo Carvalho de Melo static inline int dccp_ndp_len(const int ndp) 2777c657876SArnaldo Carvalho de Melo { 2787c657876SArnaldo Carvalho de Melo return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; 2797c657876SArnaldo Carvalho de Melo } 2807c657876SArnaldo Carvalho de Melo 2817c657876SArnaldo Carvalho de Melo void dccp_insert_option(struct sock *sk, struct sk_buff *skb, 2827c657876SArnaldo Carvalho de Melo const unsigned char option, 2837c657876SArnaldo Carvalho de Melo const void *value, const unsigned char len) 2847c657876SArnaldo Carvalho de Melo { 2857c657876SArnaldo Carvalho de Melo unsigned char *to; 2867c657876SArnaldo Carvalho de Melo 2877c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) { 2887690af3fSArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert " 2897690af3fSArnaldo Carvalho de Melo "%d option!\n", option); 2907c657876SArnaldo Carvalho de Melo return; 2917c657876SArnaldo Carvalho de Melo } 2927c657876SArnaldo Carvalho de Melo 2937c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; 2947c657876SArnaldo Carvalho de Melo 2957c657876SArnaldo Carvalho de Melo to = skb_push(skb, len + 2); 2967c657876SArnaldo Carvalho de Melo *to++ = option; 2977c657876SArnaldo Carvalho de Melo *to++ = len + 2; 2987c657876SArnaldo Carvalho de Melo 2997c657876SArnaldo Carvalho de Melo memcpy(to, value, len); 3007c657876SArnaldo Carvalho de Melo } 3017c657876SArnaldo Carvalho de Melo 3027c657876SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option); 3037c657876SArnaldo Carvalho de Melo 3047c657876SArnaldo Carvalho de Melo static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) 3057c657876SArnaldo Carvalho de Melo { 3067c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 3077c657876SArnaldo Carvalho de Melo int ndp = dp->dccps_ndp_count; 3087c657876SArnaldo Carvalho de Melo 3097c657876SArnaldo Carvalho de Melo if (dccp_non_data_packet(skb)) 3107c657876SArnaldo Carvalho de Melo ++dp->dccps_ndp_count; 3117c657876SArnaldo Carvalho de Melo else 3127c657876SArnaldo Carvalho de Melo dp->dccps_ndp_count = 0; 3137c657876SArnaldo Carvalho de Melo 3147c657876SArnaldo Carvalho de Melo if (ndp > 0) { 3157c657876SArnaldo Carvalho de Melo unsigned char *ptr; 3167c657876SArnaldo Carvalho de Melo const int ndp_len = dccp_ndp_len(ndp); 3177c657876SArnaldo Carvalho de Melo const int len = ndp_len + 2; 3187c657876SArnaldo Carvalho de Melo 3197c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 3207c657876SArnaldo Carvalho de Melo return; 3217c657876SArnaldo Carvalho de Melo 3227c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3237c657876SArnaldo Carvalho de Melo 3247c657876SArnaldo Carvalho de Melo ptr = skb_push(skb, len); 3257c657876SArnaldo Carvalho de Melo *ptr++ = DCCPO_NDP_COUNT; 3267c657876SArnaldo Carvalho de Melo *ptr++ = len; 3277c657876SArnaldo Carvalho de Melo dccp_encode_value_var(ndp, ptr, ndp_len); 3287c657876SArnaldo Carvalho de Melo } 3297c657876SArnaldo Carvalho de Melo } 3307c657876SArnaldo Carvalho de Melo 3317c657876SArnaldo Carvalho de Melo static inline int dccp_elapsed_time_len(const u32 elapsed_time) 3327c657876SArnaldo Carvalho de Melo { 333b1c9fe7bSIan McDonald return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; 3347c657876SArnaldo Carvalho de Melo } 3357c657876SArnaldo Carvalho de Melo 3367c657876SArnaldo Carvalho de Melo void dccp_insert_option_elapsed_time(struct sock *sk, 3377c657876SArnaldo Carvalho de Melo struct sk_buff *skb, 3387c657876SArnaldo Carvalho de Melo u32 elapsed_time) 3397c657876SArnaldo Carvalho de Melo { 340725ba8eeSArnaldo Carvalho de Melo #ifdef CONFIG_IP_DCCP_DEBUG 3417c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 3427690af3fSArnaldo Carvalho de Melo const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? 3437690af3fSArnaldo Carvalho de Melo "CLIENT TX opt: " : "server TX opt: "; 3447c657876SArnaldo Carvalho de Melo #endif 3457c657876SArnaldo Carvalho de Melo const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 3467c657876SArnaldo Carvalho de Melo const int len = 2 + elapsed_time_len; 3477c657876SArnaldo Carvalho de Melo unsigned char *to; 3487c657876SArnaldo Carvalho de Melo 3491bc09869SIan McDonald if (elapsed_time_len == 0) 3507c657876SArnaldo Carvalho de Melo return; 3517c657876SArnaldo Carvalho de Melo 3527c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) { 3537690af3fSArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to " 3547690af3fSArnaldo Carvalho de Melo "insert elapsed time!\n"); 3557c657876SArnaldo Carvalho de Melo return; 3567c657876SArnaldo Carvalho de Melo } 3577c657876SArnaldo Carvalho de Melo 3587c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3597c657876SArnaldo Carvalho de Melo 3607c657876SArnaldo Carvalho de Melo to = skb_push(skb, len); 3617c657876SArnaldo Carvalho de Melo *to++ = DCCPO_ELAPSED_TIME; 3627c657876SArnaldo Carvalho de Melo *to++ = len; 3637c657876SArnaldo Carvalho de Melo 3641bc09869SIan McDonald if (elapsed_time_len == 2) { 36560fe62e7SAndrea Bittau const __be16 var16 = htons((u16)elapsed_time); 3661bc09869SIan McDonald memcpy(to, &var16, 2); 3671bc09869SIan McDonald } else { 36860fe62e7SAndrea Bittau const __be32 var32 = htonl(elapsed_time); 3691bc09869SIan McDonald memcpy(to, &var32, 4); 3701bc09869SIan McDonald } 3717c657876SArnaldo Carvalho de Melo 3727c657876SArnaldo Carvalho de Melo dccp_pr_debug("%sELAPSED_TIME=%u, len=%d, seqno=%llu\n", 3737c657876SArnaldo Carvalho de Melo debug_prefix, elapsed_time, 374f6ccf554SDavid S. Miller len, 375f6ccf554SDavid S. Miller (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); 3767c657876SArnaldo Carvalho de Melo } 3777c657876SArnaldo Carvalho de Melo 378d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); 3797c657876SArnaldo Carvalho de Melo 380b0e56780SArnaldo Carvalho de Melo void dccp_timestamp(const struct sock *sk, struct timeval *tv) 381b0e56780SArnaldo Carvalho de Melo { 382b0e56780SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 383b0e56780SArnaldo Carvalho de Melo 384b0e56780SArnaldo Carvalho de Melo do_gettimeofday(tv); 385b0e56780SArnaldo Carvalho de Melo tv->tv_sec -= dp->dccps_epoch.tv_sec; 386b0e56780SArnaldo Carvalho de Melo tv->tv_usec -= dp->dccps_epoch.tv_usec; 387b0e56780SArnaldo Carvalho de Melo 388b0e56780SArnaldo Carvalho de Melo while (tv->tv_usec < 0) { 389b0e56780SArnaldo Carvalho de Melo tv->tv_sec--; 390b0e56780SArnaldo Carvalho de Melo tv->tv_usec += USEC_PER_SEC; 391b0e56780SArnaldo Carvalho de Melo } 392b0e56780SArnaldo Carvalho de Melo } 393b0e56780SArnaldo Carvalho de Melo 394b0e56780SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_timestamp); 395b0e56780SArnaldo Carvalho de Melo 396d4b81ff7SArnaldo Carvalho de Melo void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) 3977c657876SArnaldo Carvalho de Melo { 3981bc09869SIan McDonald struct timeval tv; 39960fe62e7SAndrea Bittau __be32 now; 4001bc09869SIan McDonald 401b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tv); 40260fe62e7SAndrea Bittau now = htonl(timeval_usecs(&tv) / 10); 4031bc09869SIan McDonald /* yes this will overflow but that is the point as we want a 4041bc09869SIan McDonald * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ 4051bc09869SIan McDonald 4067c657876SArnaldo Carvalho de Melo dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); 4077c657876SArnaldo Carvalho de Melo } 4087c657876SArnaldo Carvalho de Melo 409d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); 410d4b81ff7SArnaldo Carvalho de Melo 4117690af3fSArnaldo Carvalho de Melo static void dccp_insert_option_timestamp_echo(struct sock *sk, 4127690af3fSArnaldo Carvalho de Melo struct sk_buff *skb) 4137c657876SArnaldo Carvalho de Melo { 4147c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 415725ba8eeSArnaldo Carvalho de Melo #ifdef CONFIG_IP_DCCP_DEBUG 4167690af3fSArnaldo Carvalho de Melo const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ? 4177690af3fSArnaldo Carvalho de Melo "CLIENT TX opt: " : "server TX opt: "; 4187c657876SArnaldo Carvalho de Melo #endif 419b0e56780SArnaldo Carvalho de Melo struct timeval now; 42060fe62e7SAndrea Bittau __be32 tstamp_echo; 421b0e56780SArnaldo Carvalho de Melo u32 elapsed_time; 422b0e56780SArnaldo Carvalho de Melo int len, elapsed_time_len; 4237c657876SArnaldo Carvalho de Melo unsigned char *to; 4247c657876SArnaldo Carvalho de Melo 425b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 426b0e56780SArnaldo Carvalho de Melo elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10; 427b0e56780SArnaldo Carvalho de Melo elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 428b0e56780SArnaldo Carvalho de Melo len = 6 + elapsed_time_len; 429b0e56780SArnaldo Carvalho de Melo 4307c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) { 4317690af3fSArnaldo Carvalho de Melo LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert " 4327690af3fSArnaldo Carvalho de Melo "timestamp echo!\n"); 4337c657876SArnaldo Carvalho de Melo return; 4347c657876SArnaldo Carvalho de Melo } 4357c657876SArnaldo Carvalho de Melo 4367c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 4377c657876SArnaldo Carvalho de Melo 4387c657876SArnaldo Carvalho de Melo to = skb_push(skb, len); 4397c657876SArnaldo Carvalho de Melo *to++ = DCCPO_TIMESTAMP_ECHO; 4407c657876SArnaldo Carvalho de Melo *to++ = len; 4417c657876SArnaldo Carvalho de Melo 4427c657876SArnaldo Carvalho de Melo tstamp_echo = htonl(dp->dccps_timestamp_echo); 4437c657876SArnaldo Carvalho de Melo memcpy(to, &tstamp_echo, 4); 4447c657876SArnaldo Carvalho de Melo to += 4; 4451bc09869SIan McDonald 4461bc09869SIan McDonald if (elapsed_time_len == 2) { 44760fe62e7SAndrea Bittau const __be16 var16 = htons((u16)elapsed_time); 4481bc09869SIan McDonald memcpy(to, &var16, 2); 4491bc09869SIan McDonald } else if (elapsed_time_len == 4) { 45060fe62e7SAndrea Bittau const __be32 var32 = htonl(elapsed_time); 4511bc09869SIan McDonald memcpy(to, &var32, 4); 4521bc09869SIan McDonald } 4537c657876SArnaldo Carvalho de Melo 4547c657876SArnaldo Carvalho de Melo dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, seqno=%llu\n", 4557c657876SArnaldo Carvalho de Melo debug_prefix, dp->dccps_timestamp_echo, 456f6ccf554SDavid S. Miller len, 457f6ccf554SDavid S. Miller (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq); 4587c657876SArnaldo Carvalho de Melo 4597c657876SArnaldo Carvalho de Melo dp->dccps_timestamp_echo = 0; 4601bc09869SIan McDonald dp->dccps_timestamp_time.tv_sec = 0; 4611bc09869SIan McDonald dp->dccps_timestamp_time.tv_usec = 0; 4627c657876SArnaldo Carvalho de Melo } 4637c657876SArnaldo Carvalho de Melo 464afe00251SAndrea Bittau static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, 465afe00251SAndrea Bittau u8 *val, u8 len) 466afe00251SAndrea Bittau { 467afe00251SAndrea Bittau u8 *to; 468afe00251SAndrea Bittau 469afe00251SAndrea Bittau if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { 470afe00251SAndrea Bittau LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small" 471afe00251SAndrea Bittau " to insert feature %d option!\n", feat); 472afe00251SAndrea Bittau return -1; 473afe00251SAndrea Bittau } 474afe00251SAndrea Bittau 475afe00251SAndrea Bittau DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; 476afe00251SAndrea Bittau 477afe00251SAndrea Bittau to = skb_push(skb, len + 3); 478afe00251SAndrea Bittau *to++ = type; 479afe00251SAndrea Bittau *to++ = len + 3; 480afe00251SAndrea Bittau *to++ = feat; 481afe00251SAndrea Bittau 482afe00251SAndrea Bittau if (len) 483afe00251SAndrea Bittau memcpy(to, val, len); 484afe00251SAndrea Bittau dccp_pr_debug("option %d feat %d len %d\n", type, feat, len); 485afe00251SAndrea Bittau 486afe00251SAndrea Bittau return 0; 487afe00251SAndrea Bittau } 488afe00251SAndrea Bittau 489afe00251SAndrea Bittau static void dccp_insert_feat(struct sock *sk, struct sk_buff *skb) 490afe00251SAndrea Bittau { 491afe00251SAndrea Bittau struct dccp_sock *dp = dccp_sk(sk); 492afe00251SAndrea Bittau struct dccp_opt_pend *opt, *next; 493afe00251SAndrea Bittau int change = 0; 494afe00251SAndrea Bittau 495afe00251SAndrea Bittau /* confirm any options [NN opts] */ 496afe00251SAndrea Bittau list_for_each_entry_safe(opt, next, &dp->dccps_options.dccpo_conf, 497afe00251SAndrea Bittau dccpop_node) { 498afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 499afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 500afe00251SAndrea Bittau opt->dccpop_len); 501afe00251SAndrea Bittau /* fear empty confirms */ 502afe00251SAndrea Bittau if (opt->dccpop_val) 503afe00251SAndrea Bittau kfree(opt->dccpop_val); 504afe00251SAndrea Bittau kfree(opt); 505afe00251SAndrea Bittau } 506afe00251SAndrea Bittau INIT_LIST_HEAD(&dp->dccps_options.dccpo_conf); 507afe00251SAndrea Bittau 508afe00251SAndrea Bittau /* see which features we need to send */ 509afe00251SAndrea Bittau list_for_each_entry(opt, &dp->dccps_options.dccpo_pending, 510afe00251SAndrea Bittau dccpop_node) { 511afe00251SAndrea Bittau /* see if we need to send any confirm */ 512afe00251SAndrea Bittau if (opt->dccpop_sc) { 513afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type + 1, 514afe00251SAndrea Bittau opt->dccpop_feat, 515afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_val, 516afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_len); 517afe00251SAndrea Bittau 518afe00251SAndrea Bittau BUG_ON(!opt->dccpop_sc->dccpoc_val); 519afe00251SAndrea Bittau kfree(opt->dccpop_sc->dccpoc_val); 520afe00251SAndrea Bittau kfree(opt->dccpop_sc); 521afe00251SAndrea Bittau opt->dccpop_sc = NULL; 522afe00251SAndrea Bittau } 523afe00251SAndrea Bittau 524afe00251SAndrea Bittau /* any option not confirmed, re-send it */ 525afe00251SAndrea Bittau if (!opt->dccpop_conf) { 526afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 527afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 528afe00251SAndrea Bittau opt->dccpop_len); 529afe00251SAndrea Bittau change++; 530afe00251SAndrea Bittau } 531afe00251SAndrea Bittau } 532afe00251SAndrea Bittau 533afe00251SAndrea Bittau /* Retransmit timer. 534afe00251SAndrea Bittau * If this is the master listening sock, we don't set a timer on it. It 535afe00251SAndrea Bittau * should be fine because if the dude doesn't receive our RESPONSE 536afe00251SAndrea Bittau * [which will contain the CHANGE] he will send another REQUEST which 537afe00251SAndrea Bittau * will "retrnasmit" the change. 538afe00251SAndrea Bittau */ 539afe00251SAndrea Bittau if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { 540afe00251SAndrea Bittau dccp_pr_debug("reset feat negotiation timer %p\n", sk); 541afe00251SAndrea Bittau 542afe00251SAndrea Bittau /* XXX don't reset the timer on re-transmissions. I.e. reset it 543afe00251SAndrea Bittau * only when sending new stuff i guess. Currently the timer 544afe00251SAndrea Bittau * never backs off because on re-transmission it just resets it! 545afe00251SAndrea Bittau */ 546afe00251SAndrea Bittau inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, 547afe00251SAndrea Bittau inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); 548afe00251SAndrea Bittau } 549afe00251SAndrea Bittau } 550afe00251SAndrea Bittau 5517c657876SArnaldo Carvalho de Melo void dccp_insert_options(struct sock *sk, struct sk_buff *skb) 5527c657876SArnaldo Carvalho de Melo { 5537c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 5547c657876SArnaldo Carvalho de Melo 5557c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len = 0; 5567c657876SArnaldo Carvalho de Melo 5577c657876SArnaldo Carvalho de Melo if (dp->dccps_options.dccpo_send_ndp_count) 5587c657876SArnaldo Carvalho de Melo dccp_insert_option_ndp(sk, skb); 5597c657876SArnaldo Carvalho de Melo 5607c657876SArnaldo Carvalho de Melo if (!dccp_packet_without_ack(skb)) { 5617c657876SArnaldo Carvalho de Melo if (dp->dccps_options.dccpo_send_ack_vector && 562ae31c339SArnaldo Carvalho de Melo dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) 563ae31c339SArnaldo Carvalho de Melo dccp_insert_option_ackvec(sk, skb); 5647c657876SArnaldo Carvalho de Melo if (dp->dccps_timestamp_echo != 0) 5657c657876SArnaldo Carvalho de Melo dccp_insert_option_timestamp_echo(sk, skb); 5667c657876SArnaldo Carvalho de Melo } 5677c657876SArnaldo Carvalho de Melo 568507d37cfSArnaldo Carvalho de Melo if (dp->dccps_hc_rx_insert_options) { 5697c657876SArnaldo Carvalho de Melo ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb); 570507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 0; 571507d37cfSArnaldo Carvalho de Melo } 572507d37cfSArnaldo Carvalho de Melo if (dp->dccps_hc_tx_insert_options) { 5737c657876SArnaldo Carvalho de Melo ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb); 574507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 0; 575507d37cfSArnaldo Carvalho de Melo } 5767c657876SArnaldo Carvalho de Melo 577afe00251SAndrea Bittau /* Feature negotiation */ 578afe00251SAndrea Bittau switch(DCCP_SKB_CB(skb)->dccpd_type) { 579afe00251SAndrea Bittau /* Data packets can't do feat negotiation */ 580afe00251SAndrea Bittau case DCCP_PKT_DATA: 581afe00251SAndrea Bittau case DCCP_PKT_DATAACK: 582afe00251SAndrea Bittau break; 583afe00251SAndrea Bittau default: 584afe00251SAndrea Bittau dccp_insert_feat(sk, skb); 585afe00251SAndrea Bittau break; 586afe00251SAndrea Bittau } 587afe00251SAndrea Bittau 5887c657876SArnaldo Carvalho de Melo /* XXX: insert other options when appropriate */ 5897c657876SArnaldo Carvalho de Melo 5907c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { 5917c657876SArnaldo Carvalho de Melo /* The length of all options has to be a multiple of 4 */ 5927c657876SArnaldo Carvalho de Melo int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; 5937c657876SArnaldo Carvalho de Melo 5947c657876SArnaldo Carvalho de Melo if (padding != 0) { 5957c657876SArnaldo Carvalho de Melo padding = 4 - padding; 5967c657876SArnaldo Carvalho de Melo memset(skb_push(skb, padding), 0, padding); 5977c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += padding; 5987c657876SArnaldo Carvalho de Melo } 5997c657876SArnaldo Carvalho de Melo } 6007c657876SArnaldo Carvalho de Melo } 601