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> 177c657876SArnaldo Carvalho de Melo #include <linux/kernel.h> 187c657876SArnaldo Carvalho de Melo #include <linux/skbuff.h> 197c657876SArnaldo Carvalho de Melo 20ae31c339SArnaldo Carvalho de Melo #include "ackvec.h" 217c657876SArnaldo Carvalho de Melo #include "ccid.h" 227c657876SArnaldo Carvalho de Melo #include "dccp.h" 23afe00251SAndrea Bittau #include "feat.h" 247c657876SArnaldo Carvalho de Melo 25afb0a34dSGerrit Renker int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW; 26afb0a34dSGerrit Renker int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID; 27afb0a34dSGerrit Renker int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID; 28afb0a34dSGerrit Renker int sysctl_dccp_feat_ack_ratio = DCCPF_INITIAL_ACK_RATIO; 29afb0a34dSGerrit Renker int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR; 30afb0a34dSGerrit Renker int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT; 317c657876SArnaldo Carvalho de Melo 32afb0a34dSGerrit Renker EXPORT_SYMBOL_GPL(sysctl_dccp_feat_sequence_window); 334b79f0afSIan McDonald 34a4bf3902SArnaldo Carvalho de Melo void dccp_minisock_init(struct dccp_minisock *dmsk) 357c657876SArnaldo Carvalho de Melo { 36afb0a34dSGerrit Renker dmsk->dccpms_sequence_window = sysctl_dccp_feat_sequence_window; 37afb0a34dSGerrit Renker dmsk->dccpms_rx_ccid = sysctl_dccp_feat_rx_ccid; 38afb0a34dSGerrit Renker dmsk->dccpms_tx_ccid = sysctl_dccp_feat_tx_ccid; 39afb0a34dSGerrit Renker dmsk->dccpms_ack_ratio = sysctl_dccp_feat_ack_ratio; 40afb0a34dSGerrit Renker dmsk->dccpms_send_ack_vector = sysctl_dccp_feat_send_ack_vector; 41afb0a34dSGerrit Renker dmsk->dccpms_send_ndp_count = sysctl_dccp_feat_send_ndp_count; 427c657876SArnaldo Carvalho de Melo } 437c657876SArnaldo Carvalho de Melo 447c657876SArnaldo Carvalho de Melo static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) 457c657876SArnaldo Carvalho de Melo { 467c657876SArnaldo Carvalho de Melo u32 value = 0; 477c657876SArnaldo Carvalho de Melo 487c657876SArnaldo Carvalho de Melo if (len > 3) 497c657876SArnaldo Carvalho de Melo value += *bf++ << 24; 507c657876SArnaldo Carvalho de Melo if (len > 2) 517c657876SArnaldo Carvalho de Melo value += *bf++ << 16; 527c657876SArnaldo Carvalho de Melo if (len > 1) 537c657876SArnaldo Carvalho de Melo value += *bf++ << 8; 547c657876SArnaldo Carvalho de Melo if (len > 0) 557c657876SArnaldo Carvalho de Melo value += *bf; 567c657876SArnaldo Carvalho de Melo 577c657876SArnaldo Carvalho de Melo return value; 587c657876SArnaldo Carvalho de Melo } 597c657876SArnaldo Carvalho de Melo 607c657876SArnaldo Carvalho de Melo int dccp_parse_options(struct sock *sk, struct sk_buff *skb) 617c657876SArnaldo Carvalho de Melo { 627c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 637c657876SArnaldo Carvalho de Melo const struct dccp_hdr *dh = dccp_hdr(skb); 647c657876SArnaldo Carvalho de Melo const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; 657c657876SArnaldo Carvalho de Melo unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); 667c657876SArnaldo Carvalho de Melo unsigned char *opt_ptr = options; 677690af3fSArnaldo Carvalho de Melo const unsigned char *opt_end = (unsigned char *)dh + 687690af3fSArnaldo Carvalho de Melo (dh->dccph_doff * 4); 697c657876SArnaldo Carvalho de Melo struct dccp_options_received *opt_recv = &dp->dccps_options_received; 707c657876SArnaldo Carvalho de Melo unsigned char opt, len; 717c657876SArnaldo Carvalho de Melo unsigned char *value; 721c14ac0aSArnaldo Carvalho de Melo u32 elapsed_time; 73afe00251SAndrea Bittau int rc; 74afe00251SAndrea Bittau int mandatory = 0; 757c657876SArnaldo Carvalho de Melo 767c657876SArnaldo Carvalho de Melo memset(opt_recv, 0, sizeof(*opt_recv)); 777c657876SArnaldo Carvalho de Melo 78fb950496SDavid S. Miller opt = len = 0; 797c657876SArnaldo Carvalho de Melo while (opt_ptr != opt_end) { 807c657876SArnaldo Carvalho de Melo opt = *opt_ptr++; 817c657876SArnaldo Carvalho de Melo len = 0; 827c657876SArnaldo Carvalho de Melo value = NULL; 837c657876SArnaldo Carvalho de Melo 847c657876SArnaldo Carvalho de Melo /* Check if this isn't a single byte option */ 857c657876SArnaldo Carvalho de Melo if (opt > DCCPO_MAX_RESERVED) { 867c657876SArnaldo Carvalho de Melo if (opt_ptr == opt_end) 877c657876SArnaldo Carvalho de Melo goto out_invalid_option; 887c657876SArnaldo Carvalho de Melo 897c657876SArnaldo Carvalho de Melo len = *opt_ptr++; 907c657876SArnaldo Carvalho de Melo if (len < 3) 917c657876SArnaldo Carvalho de Melo goto out_invalid_option; 927c657876SArnaldo Carvalho de Melo /* 937c657876SArnaldo Carvalho de Melo * Remove the type and len fields, leaving 947c657876SArnaldo Carvalho de Melo * just the value size 957c657876SArnaldo Carvalho de Melo */ 967c657876SArnaldo Carvalho de Melo len -= 2; 977c657876SArnaldo Carvalho de Melo value = opt_ptr; 987c657876SArnaldo Carvalho de Melo opt_ptr += len; 997c657876SArnaldo Carvalho de Melo 1007c657876SArnaldo Carvalho de Melo if (opt_ptr > opt_end) 1017c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1027c657876SArnaldo Carvalho de Melo } 1037c657876SArnaldo Carvalho de Melo 1047c657876SArnaldo Carvalho de Melo switch (opt) { 1057c657876SArnaldo Carvalho de Melo case DCCPO_PADDING: 1067c657876SArnaldo Carvalho de Melo break; 107afe00251SAndrea Bittau case DCCPO_MANDATORY: 108afe00251SAndrea Bittau if (mandatory) 109afe00251SAndrea Bittau goto out_invalid_option; 1106df9424aSArnaldo Carvalho de Melo if (pkt_type != DCCP_PKT_DATA) 111afe00251SAndrea Bittau mandatory = 1; 112afe00251SAndrea Bittau break; 1137c657876SArnaldo Carvalho de Melo case DCCPO_NDP_COUNT: 1147c657876SArnaldo Carvalho de Melo if (len > 3) 1157c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1167c657876SArnaldo Carvalho de Melo 1177c657876SArnaldo Carvalho de Melo opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); 118*09dbc389SGerrit Renker dccp_pr_debug("%s rx opt: NDP count=%d\n", dccp_role(sk), 1197690af3fSArnaldo Carvalho de Melo opt_recv->dccpor_ndp); 1207c657876SArnaldo Carvalho de Melo break; 121afe00251SAndrea Bittau case DCCPO_CHANGE_L: 122afe00251SAndrea Bittau /* fall through */ 123afe00251SAndrea Bittau case DCCPO_CHANGE_R: 124afe00251SAndrea Bittau if (len < 2) 125afe00251SAndrea Bittau goto out_invalid_option; 126afe00251SAndrea Bittau rc = dccp_feat_change_recv(sk, opt, *value, value + 1, 127afe00251SAndrea Bittau len - 1); 128afe00251SAndrea Bittau /* 129afe00251SAndrea Bittau * When there is a change error, change_recv is 130afe00251SAndrea Bittau * responsible for dealing with it. i.e. reply with an 131afe00251SAndrea Bittau * empty confirm. 132afe00251SAndrea Bittau * If the change was mandatory, then we need to die. 133afe00251SAndrea Bittau */ 134afe00251SAndrea Bittau if (rc && mandatory) 135afe00251SAndrea Bittau goto out_invalid_option; 136afe00251SAndrea Bittau break; 137afe00251SAndrea Bittau case DCCPO_CONFIRM_L: 138afe00251SAndrea Bittau /* fall through */ 139afe00251SAndrea Bittau case DCCPO_CONFIRM_R: 140afe00251SAndrea Bittau if (len < 2) 141afe00251SAndrea Bittau goto out_invalid_option; 142afe00251SAndrea Bittau if (dccp_feat_confirm_recv(sk, opt, *value, 143afe00251SAndrea Bittau value + 1, len - 1)) 144afe00251SAndrea Bittau goto out_invalid_option; 145afe00251SAndrea Bittau break; 1467c657876SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_0: 147ae31c339SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_1: 1487c657876SArnaldo Carvalho de Melo if (pkt_type == DCCP_PKT_DATA) 149e5a6de91SArnaldo Carvalho de Melo break; 1507c657876SArnaldo Carvalho de Melo 151a4bf3902SArnaldo Carvalho de Melo if (dccp_msk(sk)->dccpms_send_ack_vector && 152ae31c339SArnaldo Carvalho de Melo dccp_ackvec_parse(sk, skb, opt, value, len)) 153ae31c339SArnaldo Carvalho de Melo goto out_invalid_option; 1547c657876SArnaldo Carvalho de Melo break; 1557c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP: 1567c657876SArnaldo Carvalho de Melo if (len != 4) 1577c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1587c657876SArnaldo Carvalho de Melo 15960fe62e7SAndrea Bittau opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); 1607c657876SArnaldo Carvalho de Melo 1617c657876SArnaldo Carvalho de Melo dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; 162b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &dp->dccps_timestamp_time); 1637c657876SArnaldo Carvalho de Melo 164*09dbc389SGerrit Renker dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", 165*09dbc389SGerrit Renker dccp_role(sk), opt_recv->dccpor_timestamp, 166f6ccf554SDavid S. Miller (unsigned long long) 1677c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 1687c657876SArnaldo Carvalho de Melo break; 1697c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP_ECHO: 1701bc09869SIan McDonald if (len != 4 && len != 6 && len != 8) 1717c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1727c657876SArnaldo Carvalho de Melo 17360fe62e7SAndrea Bittau opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); 1747c657876SArnaldo Carvalho de Melo 175*09dbc389SGerrit Renker dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " 176*09dbc389SGerrit Renker "ackno=%llu, ", dccp_role(sk), 1777690af3fSArnaldo Carvalho de Melo opt_recv->dccpor_timestamp_echo, 178f6ccf554SDavid S. Miller len + 2, 179f6ccf554SDavid S. Miller (unsigned long long) 1801bc09869SIan McDonald DCCP_SKB_CB(skb)->dccpd_ack_seq); 1817c657876SArnaldo Carvalho de Melo 1821bc09869SIan McDonald 1831c14ac0aSArnaldo Carvalho de Melo if (len == 4) 1841c14ac0aSArnaldo Carvalho de Melo break; 1851c14ac0aSArnaldo Carvalho de Melo 1861c14ac0aSArnaldo Carvalho de Melo if (len == 6) 18760fe62e7SAndrea Bittau elapsed_time = ntohs(*(__be16 *)(value + 4)); 1881c14ac0aSArnaldo Carvalho de Melo else 18960fe62e7SAndrea Bittau elapsed_time = ntohl(*(__be32 *)(value + 4)); 1901c14ac0aSArnaldo Carvalho de Melo 1911c14ac0aSArnaldo Carvalho de Melo /* Give precedence to the biggest ELAPSED_TIME */ 1921c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 1931c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 1947c657876SArnaldo Carvalho de Melo break; 1957c657876SArnaldo Carvalho de Melo case DCCPO_ELAPSED_TIME: 1961bc09869SIan McDonald if (len != 2 && len != 4) 1977c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1987c657876SArnaldo Carvalho de Melo 1997c657876SArnaldo Carvalho de Melo if (pkt_type == DCCP_PKT_DATA) 2007c657876SArnaldo Carvalho de Melo continue; 2011bc09869SIan McDonald 2021bc09869SIan McDonald if (len == 2) 20360fe62e7SAndrea Bittau elapsed_time = ntohs(*(__be16 *)value); 2041bc09869SIan McDonald else 20560fe62e7SAndrea Bittau elapsed_time = ntohl(*(__be32 *)value); 2061c14ac0aSArnaldo Carvalho de Melo 2071c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 2081c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 2091bc09869SIan McDonald 210*09dbc389SGerrit Renker dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", 211*09dbc389SGerrit Renker dccp_role(sk), elapsed_time); 2127c657876SArnaldo Carvalho de Melo break; 2137c657876SArnaldo Carvalho de Melo /* 2140e64e94eSGerrit Renker * From RFC 4340, sec. 10.3: 2157c657876SArnaldo Carvalho de Melo * 2167690af3fSArnaldo Carvalho de Melo * Option numbers 128 through 191 are for 2177690af3fSArnaldo Carvalho de Melo * options sent from the HC-Sender to the 2187690af3fSArnaldo Carvalho de Melo * HC-Receiver; option numbers 192 through 255 2197690af3fSArnaldo Carvalho de Melo * are for options sent from the HC-Receiver to 2207690af3fSArnaldo Carvalho de Melo * the HC-Sender. 2217c657876SArnaldo Carvalho de Melo */ 2227c657876SArnaldo Carvalho de Melo case 128 ... 191: { 2237c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2247c657876SArnaldo Carvalho de Melo 2257690af3fSArnaldo Carvalho de Melo if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, 2267690af3fSArnaldo Carvalho de Melo opt, len, idx, 2277690af3fSArnaldo Carvalho de Melo value) != 0) 2287c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2297c657876SArnaldo Carvalho de Melo } 2307c657876SArnaldo Carvalho de Melo break; 2317c657876SArnaldo Carvalho de Melo case 192 ... 255: { 2327c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2337c657876SArnaldo Carvalho de Melo 2347690af3fSArnaldo Carvalho de Melo if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, 2357690af3fSArnaldo Carvalho de Melo opt, len, idx, 2367690af3fSArnaldo Carvalho de Melo value) != 0) 2377c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2387c657876SArnaldo Carvalho de Melo } 2397c657876SArnaldo Carvalho de Melo break; 2407c657876SArnaldo Carvalho de Melo default: 2417690af3fSArnaldo Carvalho de Melo pr_info("DCCP(%p): option %d(len=%d) not " 2427690af3fSArnaldo Carvalho de Melo "implemented, ignoring\n", 2437c657876SArnaldo Carvalho de Melo sk, opt, len); 2447c657876SArnaldo Carvalho de Melo break; 2457c657876SArnaldo Carvalho de Melo } 246afe00251SAndrea Bittau 247afe00251SAndrea Bittau if (opt != DCCPO_MANDATORY) 248afe00251SAndrea Bittau mandatory = 0; 2497c657876SArnaldo Carvalho de Melo } 2507c657876SArnaldo Carvalho de Melo 2516df9424aSArnaldo Carvalho de Melo /* mandatory was the last byte in option list -> reset connection */ 2526df9424aSArnaldo Carvalho de Melo if (mandatory) 2536df9424aSArnaldo Carvalho de Melo goto out_invalid_option; 2546df9424aSArnaldo Carvalho de Melo 2557c657876SArnaldo Carvalho de Melo return 0; 2567c657876SArnaldo Carvalho de Melo 2577c657876SArnaldo Carvalho de Melo out_invalid_option: 2587c657876SArnaldo Carvalho de Melo DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); 2597c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; 2607c657876SArnaldo Carvalho de Melo pr_info("DCCP(%p): invalid option %d, len=%d\n", sk, opt, len); 2617c657876SArnaldo Carvalho de Melo return -1; 2627c657876SArnaldo Carvalho de Melo } 2637c657876SArnaldo Carvalho de Melo 264b61fafc4SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_parse_options); 265b61fafc4SArnaldo Carvalho de Melo 2667c657876SArnaldo Carvalho de Melo static void dccp_encode_value_var(const u32 value, unsigned char *to, 2677c657876SArnaldo Carvalho de Melo const unsigned int len) 2687c657876SArnaldo Carvalho de Melo { 2697c657876SArnaldo Carvalho de Melo if (len > 3) 2707c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF000000) >> 24; 2717c657876SArnaldo Carvalho de Melo if (len > 2) 2727c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF0000) >> 16; 2737c657876SArnaldo Carvalho de Melo if (len > 1) 2747c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF00) >> 8; 2757c657876SArnaldo Carvalho de Melo if (len > 0) 2767c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF); 2777c657876SArnaldo Carvalho de Melo } 2787c657876SArnaldo Carvalho de Melo 2797c657876SArnaldo Carvalho de Melo static inline int dccp_ndp_len(const int ndp) 2807c657876SArnaldo Carvalho de Melo { 2817c657876SArnaldo Carvalho de Melo return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; 2827c657876SArnaldo Carvalho de Melo } 2837c657876SArnaldo Carvalho de Melo 2842d0817d1SArnaldo Carvalho de Melo int dccp_insert_option(struct sock *sk, struct sk_buff *skb, 2857c657876SArnaldo Carvalho de Melo const unsigned char option, 2867c657876SArnaldo Carvalho de Melo const void *value, const unsigned char len) 2877c657876SArnaldo Carvalho de Melo { 2887c657876SArnaldo Carvalho de Melo unsigned char *to; 2897c657876SArnaldo Carvalho de Melo 2902d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) 2912d0817d1SArnaldo Carvalho de Melo return -1; 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); 3002d0817d1SArnaldo Carvalho de Melo return 0; 3017c657876SArnaldo Carvalho de Melo } 3027c657876SArnaldo Carvalho de Melo 3037c657876SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option); 3047c657876SArnaldo Carvalho de Melo 3052d0817d1SArnaldo Carvalho de Melo static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) 3067c657876SArnaldo Carvalho de Melo { 3077c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 3087c657876SArnaldo Carvalho de Melo int ndp = dp->dccps_ndp_count; 3097c657876SArnaldo Carvalho de Melo 3107c657876SArnaldo Carvalho de Melo if (dccp_non_data_packet(skb)) 3117c657876SArnaldo Carvalho de Melo ++dp->dccps_ndp_count; 3127c657876SArnaldo Carvalho de Melo else 3137c657876SArnaldo Carvalho de Melo dp->dccps_ndp_count = 0; 3147c657876SArnaldo Carvalho de Melo 3157c657876SArnaldo Carvalho de Melo if (ndp > 0) { 3167c657876SArnaldo Carvalho de Melo unsigned char *ptr; 3177c657876SArnaldo Carvalho de Melo const int ndp_len = dccp_ndp_len(ndp); 3187c657876SArnaldo Carvalho de Melo const int len = ndp_len + 2; 3197c657876SArnaldo Carvalho de Melo 3207c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 3212d0817d1SArnaldo Carvalho de Melo return -1; 3227c657876SArnaldo Carvalho de Melo 3237c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3247c657876SArnaldo Carvalho de Melo 3257c657876SArnaldo Carvalho de Melo ptr = skb_push(skb, len); 3267c657876SArnaldo Carvalho de Melo *ptr++ = DCCPO_NDP_COUNT; 3277c657876SArnaldo Carvalho de Melo *ptr++ = len; 3287c657876SArnaldo Carvalho de Melo dccp_encode_value_var(ndp, ptr, ndp_len); 3297c657876SArnaldo Carvalho de Melo } 3302d0817d1SArnaldo Carvalho de Melo 3312d0817d1SArnaldo Carvalho de Melo return 0; 3327c657876SArnaldo Carvalho de Melo } 3337c657876SArnaldo Carvalho de Melo 3347c657876SArnaldo Carvalho de Melo static inline int dccp_elapsed_time_len(const u32 elapsed_time) 3357c657876SArnaldo Carvalho de Melo { 336b1c9fe7bSIan McDonald return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; 3377c657876SArnaldo Carvalho de Melo } 3387c657876SArnaldo Carvalho de Melo 3392d0817d1SArnaldo Carvalho de Melo int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, 3407c657876SArnaldo Carvalho de Melo u32 elapsed_time) 3417c657876SArnaldo Carvalho de Melo { 3427c657876SArnaldo Carvalho de Melo const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 3437c657876SArnaldo Carvalho de Melo const int len = 2 + elapsed_time_len; 3447c657876SArnaldo Carvalho de Melo unsigned char *to; 3457c657876SArnaldo Carvalho de Melo 3461bc09869SIan McDonald if (elapsed_time_len == 0) 3472d0817d1SArnaldo Carvalho de Melo return 0; 3487c657876SArnaldo Carvalho de Melo 3492d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 3502d0817d1SArnaldo Carvalho de Melo return -1; 3517c657876SArnaldo Carvalho de Melo 3527c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3537c657876SArnaldo Carvalho de Melo 3547c657876SArnaldo Carvalho de Melo to = skb_push(skb, len); 3557c657876SArnaldo Carvalho de Melo *to++ = DCCPO_ELAPSED_TIME; 3567c657876SArnaldo Carvalho de Melo *to++ = len; 3577c657876SArnaldo Carvalho de Melo 3581bc09869SIan McDonald if (elapsed_time_len == 2) { 35960fe62e7SAndrea Bittau const __be16 var16 = htons((u16)elapsed_time); 3601bc09869SIan McDonald memcpy(to, &var16, 2); 3611bc09869SIan McDonald } else { 36260fe62e7SAndrea Bittau const __be32 var32 = htonl(elapsed_time); 3631bc09869SIan McDonald memcpy(to, &var32, 4); 3641bc09869SIan McDonald } 3657c657876SArnaldo Carvalho de Melo 3662d0817d1SArnaldo Carvalho de Melo return 0; 3677c657876SArnaldo Carvalho de Melo } 3687c657876SArnaldo Carvalho de Melo 369d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); 3707c657876SArnaldo Carvalho de Melo 371b0e56780SArnaldo Carvalho de Melo void dccp_timestamp(const struct sock *sk, struct timeval *tv) 372b0e56780SArnaldo Carvalho de Melo { 373b0e56780SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 374b0e56780SArnaldo Carvalho de Melo 375b0e56780SArnaldo Carvalho de Melo do_gettimeofday(tv); 376b0e56780SArnaldo Carvalho de Melo tv->tv_sec -= dp->dccps_epoch.tv_sec; 377b0e56780SArnaldo Carvalho de Melo tv->tv_usec -= dp->dccps_epoch.tv_usec; 378b0e56780SArnaldo Carvalho de Melo 379b0e56780SArnaldo Carvalho de Melo while (tv->tv_usec < 0) { 380b0e56780SArnaldo Carvalho de Melo tv->tv_sec--; 381b0e56780SArnaldo Carvalho de Melo tv->tv_usec += USEC_PER_SEC; 382b0e56780SArnaldo Carvalho de Melo } 383b0e56780SArnaldo Carvalho de Melo } 384b0e56780SArnaldo Carvalho de Melo 385b0e56780SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_timestamp); 386b0e56780SArnaldo Carvalho de Melo 3872d0817d1SArnaldo Carvalho de Melo int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) 3887c657876SArnaldo Carvalho de Melo { 3891bc09869SIan McDonald struct timeval tv; 39060fe62e7SAndrea Bittau __be32 now; 3911bc09869SIan McDonald 392b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tv); 39360fe62e7SAndrea Bittau now = htonl(timeval_usecs(&tv) / 10); 3941bc09869SIan McDonald /* yes this will overflow but that is the point as we want a 3951bc09869SIan McDonald * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ 3961bc09869SIan McDonald 3972d0817d1SArnaldo Carvalho de Melo return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); 3987c657876SArnaldo Carvalho de Melo } 3997c657876SArnaldo Carvalho de Melo 400d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); 401d4b81ff7SArnaldo Carvalho de Melo 4022d0817d1SArnaldo Carvalho de Melo static int dccp_insert_option_timestamp_echo(struct sock *sk, 4037690af3fSArnaldo Carvalho de Melo struct sk_buff *skb) 4047c657876SArnaldo Carvalho de Melo { 4057c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 406b0e56780SArnaldo Carvalho de Melo struct timeval now; 40760fe62e7SAndrea Bittau __be32 tstamp_echo; 408b0e56780SArnaldo Carvalho de Melo u32 elapsed_time; 409b0e56780SArnaldo Carvalho de Melo int len, elapsed_time_len; 4107c657876SArnaldo Carvalho de Melo unsigned char *to; 4117c657876SArnaldo Carvalho de Melo 412b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &now); 413b0e56780SArnaldo Carvalho de Melo elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10; 414b0e56780SArnaldo Carvalho de Melo elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 415b0e56780SArnaldo Carvalho de Melo len = 6 + elapsed_time_len; 416b0e56780SArnaldo Carvalho de Melo 4172d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 4182d0817d1SArnaldo Carvalho de Melo return -1; 4197c657876SArnaldo Carvalho de Melo 4207c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 4217c657876SArnaldo Carvalho de Melo 4227c657876SArnaldo Carvalho de Melo to = skb_push(skb, len); 4237c657876SArnaldo Carvalho de Melo *to++ = DCCPO_TIMESTAMP_ECHO; 4247c657876SArnaldo Carvalho de Melo *to++ = len; 4257c657876SArnaldo Carvalho de Melo 4267c657876SArnaldo Carvalho de Melo tstamp_echo = htonl(dp->dccps_timestamp_echo); 4277c657876SArnaldo Carvalho de Melo memcpy(to, &tstamp_echo, 4); 4287c657876SArnaldo Carvalho de Melo to += 4; 4291bc09869SIan McDonald 4301bc09869SIan McDonald if (elapsed_time_len == 2) { 43160fe62e7SAndrea Bittau const __be16 var16 = htons((u16)elapsed_time); 4321bc09869SIan McDonald memcpy(to, &var16, 2); 4331bc09869SIan McDonald } else if (elapsed_time_len == 4) { 43460fe62e7SAndrea Bittau const __be32 var32 = htonl(elapsed_time); 4351bc09869SIan McDonald memcpy(to, &var32, 4); 4361bc09869SIan McDonald } 4377c657876SArnaldo Carvalho de Melo 4387c657876SArnaldo Carvalho de Melo dp->dccps_timestamp_echo = 0; 4391bc09869SIan McDonald dp->dccps_timestamp_time.tv_sec = 0; 4401bc09869SIan McDonald dp->dccps_timestamp_time.tv_usec = 0; 4412d0817d1SArnaldo Carvalho de Melo return 0; 4427c657876SArnaldo Carvalho de Melo } 4437c657876SArnaldo Carvalho de Melo 444afe00251SAndrea Bittau static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, 445afe00251SAndrea Bittau u8 *val, u8 len) 446afe00251SAndrea Bittau { 447afe00251SAndrea Bittau u8 *to; 448afe00251SAndrea Bittau 449afe00251SAndrea Bittau if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { 450afe00251SAndrea Bittau LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small" 451afe00251SAndrea Bittau " to insert feature %d option!\n", feat); 452afe00251SAndrea Bittau return -1; 453afe00251SAndrea Bittau } 454afe00251SAndrea Bittau 455afe00251SAndrea Bittau DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; 456afe00251SAndrea Bittau 457afe00251SAndrea Bittau to = skb_push(skb, len + 3); 458afe00251SAndrea Bittau *to++ = type; 459afe00251SAndrea Bittau *to++ = len + 3; 460afe00251SAndrea Bittau *to++ = feat; 461afe00251SAndrea Bittau 462afe00251SAndrea Bittau if (len) 463afe00251SAndrea Bittau memcpy(to, val, len); 464afe00251SAndrea Bittau 465c02fdc0eSGerrit Renker dccp_pr_debug("%s(%s (%d), ...), length %d\n", 466c02fdc0eSGerrit Renker dccp_feat_typename(type), 467c02fdc0eSGerrit Renker dccp_feat_name(feat), feat, len); 468afe00251SAndrea Bittau return 0; 469afe00251SAndrea Bittau } 470afe00251SAndrea Bittau 4712d0817d1SArnaldo Carvalho de Melo static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) 472afe00251SAndrea Bittau { 473afe00251SAndrea Bittau struct dccp_sock *dp = dccp_sk(sk); 474a4bf3902SArnaldo Carvalho de Melo struct dccp_minisock *dmsk = dccp_msk(sk); 475afe00251SAndrea Bittau struct dccp_opt_pend *opt, *next; 476afe00251SAndrea Bittau int change = 0; 477afe00251SAndrea Bittau 478afe00251SAndrea Bittau /* confirm any options [NN opts] */ 479a4bf3902SArnaldo Carvalho de Melo list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { 480afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 481afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 482afe00251SAndrea Bittau opt->dccpop_len); 483afe00251SAndrea Bittau /* fear empty confirms */ 484afe00251SAndrea Bittau if (opt->dccpop_val) 485afe00251SAndrea Bittau kfree(opt->dccpop_val); 486afe00251SAndrea Bittau kfree(opt); 487afe00251SAndrea Bittau } 488a4bf3902SArnaldo Carvalho de Melo INIT_LIST_HEAD(&dmsk->dccpms_conf); 489afe00251SAndrea Bittau 490afe00251SAndrea Bittau /* see which features we need to send */ 491a4bf3902SArnaldo Carvalho de Melo list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { 492afe00251SAndrea Bittau /* see if we need to send any confirm */ 493afe00251SAndrea Bittau if (opt->dccpop_sc) { 494afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type + 1, 495afe00251SAndrea Bittau opt->dccpop_feat, 496afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_val, 497afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_len); 498afe00251SAndrea Bittau 499afe00251SAndrea Bittau BUG_ON(!opt->dccpop_sc->dccpoc_val); 500afe00251SAndrea Bittau kfree(opt->dccpop_sc->dccpoc_val); 501afe00251SAndrea Bittau kfree(opt->dccpop_sc); 502afe00251SAndrea Bittau opt->dccpop_sc = NULL; 503afe00251SAndrea Bittau } 504afe00251SAndrea Bittau 505afe00251SAndrea Bittau /* any option not confirmed, re-send it */ 506afe00251SAndrea Bittau if (!opt->dccpop_conf) { 507afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 508afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 509afe00251SAndrea Bittau opt->dccpop_len); 510afe00251SAndrea Bittau change++; 511afe00251SAndrea Bittau } 512afe00251SAndrea Bittau } 513afe00251SAndrea Bittau 514afe00251SAndrea Bittau /* Retransmit timer. 515afe00251SAndrea Bittau * If this is the master listening sock, we don't set a timer on it. It 516afe00251SAndrea Bittau * should be fine because if the dude doesn't receive our RESPONSE 517afe00251SAndrea Bittau * [which will contain the CHANGE] he will send another REQUEST which 518afe00251SAndrea Bittau * will "retrnasmit" the change. 519afe00251SAndrea Bittau */ 520afe00251SAndrea Bittau if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { 521afe00251SAndrea Bittau dccp_pr_debug("reset feat negotiation timer %p\n", sk); 522afe00251SAndrea Bittau 523afe00251SAndrea Bittau /* XXX don't reset the timer on re-transmissions. I.e. reset it 524afe00251SAndrea Bittau * only when sending new stuff i guess. Currently the timer 525afe00251SAndrea Bittau * never backs off because on re-transmission it just resets it! 526afe00251SAndrea Bittau */ 527afe00251SAndrea Bittau inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, 528afe00251SAndrea Bittau inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); 529afe00251SAndrea Bittau } 5302d0817d1SArnaldo Carvalho de Melo 5312d0817d1SArnaldo Carvalho de Melo return 0; 532afe00251SAndrea Bittau } 533afe00251SAndrea Bittau 5342d0817d1SArnaldo Carvalho de Melo int dccp_insert_options(struct sock *sk, struct sk_buff *skb) 5357c657876SArnaldo Carvalho de Melo { 5367c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 537a4bf3902SArnaldo Carvalho de Melo struct dccp_minisock *dmsk = dccp_msk(sk); 5387c657876SArnaldo Carvalho de Melo 5397c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len = 0; 5407c657876SArnaldo Carvalho de Melo 541a4bf3902SArnaldo Carvalho de Melo if (dmsk->dccpms_send_ndp_count && 5422d0817d1SArnaldo Carvalho de Melo dccp_insert_option_ndp(sk, skb)) 5432d0817d1SArnaldo Carvalho de Melo return -1; 5447c657876SArnaldo Carvalho de Melo 5457c657876SArnaldo Carvalho de Melo if (!dccp_packet_without_ack(skb)) { 546a4bf3902SArnaldo Carvalho de Melo if (dmsk->dccpms_send_ack_vector && 5472d0817d1SArnaldo Carvalho de Melo dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && 5482d0817d1SArnaldo Carvalho de Melo dccp_insert_option_ackvec(sk, skb)) 5492d0817d1SArnaldo Carvalho de Melo return -1; 5502d0817d1SArnaldo Carvalho de Melo 5512d0817d1SArnaldo Carvalho de Melo if (dp->dccps_timestamp_echo != 0 && 5522d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp_echo(sk, skb)) 5532d0817d1SArnaldo Carvalho de Melo return -1; 5547c657876SArnaldo Carvalho de Melo } 5557c657876SArnaldo Carvalho de Melo 556507d37cfSArnaldo Carvalho de Melo if (dp->dccps_hc_rx_insert_options) { 5572d0817d1SArnaldo Carvalho de Melo if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) 5582d0817d1SArnaldo Carvalho de Melo return -1; 559507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 0; 560507d37cfSArnaldo Carvalho de Melo } 561507d37cfSArnaldo Carvalho de Melo if (dp->dccps_hc_tx_insert_options) { 5622d0817d1SArnaldo Carvalho de Melo if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb)) 5632d0817d1SArnaldo Carvalho de Melo return -1; 564507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_tx_insert_options = 0; 565507d37cfSArnaldo Carvalho de Melo } 5667c657876SArnaldo Carvalho de Melo 567afe00251SAndrea Bittau /* Feature negotiation */ 568afe00251SAndrea Bittau /* Data packets can't do feat negotiation */ 5692d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && 5702d0817d1SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && 5712d0817d1SArnaldo Carvalho de Melo dccp_insert_options_feat(sk, skb)) 5722d0817d1SArnaldo Carvalho de Melo return -1; 573afe00251SAndrea Bittau 5747c657876SArnaldo Carvalho de Melo /* XXX: insert other options when appropriate */ 5757c657876SArnaldo Carvalho de Melo 5767c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { 5777c657876SArnaldo Carvalho de Melo /* The length of all options has to be a multiple of 4 */ 5787c657876SArnaldo Carvalho de Melo int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; 5797c657876SArnaldo Carvalho de Melo 5807c657876SArnaldo Carvalho de Melo if (padding != 0) { 5817c657876SArnaldo Carvalho de Melo padding = 4 - padding; 5827c657876SArnaldo Carvalho de Melo memset(skb_push(skb, padding), 0, padding); 5837c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += padding; 5847c657876SArnaldo Carvalho de Melo } 5857c657876SArnaldo Carvalho de Melo } 5862d0817d1SArnaldo Carvalho de Melo 5872d0817d1SArnaldo Carvalho de Melo return 0; 5887c657876SArnaldo Carvalho de Melo } 589