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 32a4bf3902SArnaldo Carvalho de Melo void dccp_minisock_init(struct dccp_minisock *dmsk) 337c657876SArnaldo Carvalho de Melo { 34afb0a34dSGerrit Renker dmsk->dccpms_sequence_window = sysctl_dccp_feat_sequence_window; 35afb0a34dSGerrit Renker dmsk->dccpms_rx_ccid = sysctl_dccp_feat_rx_ccid; 36afb0a34dSGerrit Renker dmsk->dccpms_tx_ccid = sysctl_dccp_feat_tx_ccid; 37afb0a34dSGerrit Renker dmsk->dccpms_ack_ratio = sysctl_dccp_feat_ack_ratio; 38afb0a34dSGerrit Renker dmsk->dccpms_send_ack_vector = sysctl_dccp_feat_send_ack_vector; 39afb0a34dSGerrit Renker dmsk->dccpms_send_ndp_count = sysctl_dccp_feat_send_ndp_count; 407c657876SArnaldo Carvalho de Melo } 417c657876SArnaldo Carvalho de Melo 427c657876SArnaldo Carvalho de Melo static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) 437c657876SArnaldo Carvalho de Melo { 447c657876SArnaldo Carvalho de Melo u32 value = 0; 457c657876SArnaldo Carvalho de Melo 467c657876SArnaldo Carvalho de Melo if (len > 3) 477c657876SArnaldo Carvalho de Melo value += *bf++ << 24; 487c657876SArnaldo Carvalho de Melo if (len > 2) 497c657876SArnaldo Carvalho de Melo value += *bf++ << 16; 507c657876SArnaldo Carvalho de Melo if (len > 1) 517c657876SArnaldo Carvalho de Melo value += *bf++ << 8; 527c657876SArnaldo Carvalho de Melo if (len > 0) 537c657876SArnaldo Carvalho de Melo value += *bf; 547c657876SArnaldo Carvalho de Melo 557c657876SArnaldo Carvalho de Melo return value; 567c657876SArnaldo Carvalho de Melo } 577c657876SArnaldo Carvalho de Melo 587c657876SArnaldo Carvalho de Melo int dccp_parse_options(struct sock *sk, struct sk_buff *skb) 597c657876SArnaldo Carvalho de Melo { 607c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 617c657876SArnaldo Carvalho de Melo const struct dccp_hdr *dh = dccp_hdr(skb); 627c657876SArnaldo Carvalho de Melo const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type; 63bdf13d20SAndrea Bittau u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq; 647c657876SArnaldo Carvalho de Melo unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb); 657c657876SArnaldo Carvalho de Melo unsigned char *opt_ptr = options; 667690af3fSArnaldo Carvalho de Melo const unsigned char *opt_end = (unsigned char *)dh + 677690af3fSArnaldo Carvalho de Melo (dh->dccph_doff * 4); 687c657876SArnaldo Carvalho de Melo struct dccp_options_received *opt_recv = &dp->dccps_options_received; 697c657876SArnaldo Carvalho de Melo unsigned char opt, len; 707c657876SArnaldo Carvalho de Melo unsigned char *value; 711c14ac0aSArnaldo Carvalho de Melo u32 elapsed_time; 72afe00251SAndrea Bittau int rc; 73afe00251SAndrea Bittau int mandatory = 0; 747c657876SArnaldo Carvalho de Melo 757c657876SArnaldo Carvalho de Melo memset(opt_recv, 0, sizeof(*opt_recv)); 767c657876SArnaldo Carvalho de Melo 77fb950496SDavid S. Miller opt = len = 0; 787c657876SArnaldo Carvalho de Melo while (opt_ptr != opt_end) { 797c657876SArnaldo Carvalho de Melo opt = *opt_ptr++; 807c657876SArnaldo Carvalho de Melo len = 0; 817c657876SArnaldo Carvalho de Melo value = NULL; 827c657876SArnaldo Carvalho de Melo 837c657876SArnaldo Carvalho de Melo /* Check if this isn't a single byte option */ 847c657876SArnaldo Carvalho de Melo if (opt > DCCPO_MAX_RESERVED) { 857c657876SArnaldo Carvalho de Melo if (opt_ptr == opt_end) 867c657876SArnaldo Carvalho de Melo goto out_invalid_option; 877c657876SArnaldo Carvalho de Melo 887c657876SArnaldo Carvalho de Melo len = *opt_ptr++; 897c657876SArnaldo Carvalho de Melo if (len < 3) 907c657876SArnaldo Carvalho de Melo goto out_invalid_option; 917c657876SArnaldo Carvalho de Melo /* 927c657876SArnaldo Carvalho de Melo * Remove the type and len fields, leaving 937c657876SArnaldo Carvalho de Melo * just the value size 947c657876SArnaldo Carvalho de Melo */ 957c657876SArnaldo Carvalho de Melo len -= 2; 967c657876SArnaldo Carvalho de Melo value = opt_ptr; 977c657876SArnaldo Carvalho de Melo opt_ptr += len; 987c657876SArnaldo Carvalho de Melo 997c657876SArnaldo Carvalho de Melo if (opt_ptr > opt_end) 1007c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1017c657876SArnaldo Carvalho de Melo } 1027c657876SArnaldo Carvalho de Melo 1037c657876SArnaldo Carvalho de Melo switch (opt) { 1047c657876SArnaldo Carvalho de Melo case DCCPO_PADDING: 1057c657876SArnaldo Carvalho de Melo break; 106afe00251SAndrea Bittau case DCCPO_MANDATORY: 107afe00251SAndrea Bittau if (mandatory) 108afe00251SAndrea Bittau goto out_invalid_option; 1096df9424aSArnaldo Carvalho de Melo if (pkt_type != DCCP_PKT_DATA) 110afe00251SAndrea Bittau mandatory = 1; 111afe00251SAndrea Bittau break; 1127c657876SArnaldo Carvalho de Melo case DCCPO_NDP_COUNT: 1137c657876SArnaldo Carvalho de Melo if (len > 3) 1147c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1157c657876SArnaldo Carvalho de Melo 1167c657876SArnaldo Carvalho de Melo opt_recv->dccpor_ndp = dccp_decode_value_var(value, len); 11709dbc389SGerrit Renker dccp_pr_debug("%s rx opt: NDP count=%d\n", dccp_role(sk), 1187690af3fSArnaldo Carvalho de Melo opt_recv->dccpor_ndp); 1197c657876SArnaldo Carvalho de Melo break; 120afe00251SAndrea Bittau case DCCPO_CHANGE_L: 121afe00251SAndrea Bittau /* fall through */ 122afe00251SAndrea Bittau case DCCPO_CHANGE_R: 123afe00251SAndrea Bittau if (len < 2) 124afe00251SAndrea Bittau goto out_invalid_option; 125afe00251SAndrea Bittau rc = dccp_feat_change_recv(sk, opt, *value, value + 1, 126afe00251SAndrea Bittau len - 1); 127afe00251SAndrea Bittau /* 128afe00251SAndrea Bittau * When there is a change error, change_recv is 129afe00251SAndrea Bittau * responsible for dealing with it. i.e. reply with an 130afe00251SAndrea Bittau * empty confirm. 131afe00251SAndrea Bittau * If the change was mandatory, then we need to die. 132afe00251SAndrea Bittau */ 133afe00251SAndrea Bittau if (rc && mandatory) 134afe00251SAndrea Bittau goto out_invalid_option; 135afe00251SAndrea Bittau break; 136afe00251SAndrea Bittau case DCCPO_CONFIRM_L: 137afe00251SAndrea Bittau /* fall through */ 138afe00251SAndrea Bittau case DCCPO_CONFIRM_R: 139afe00251SAndrea Bittau if (len < 2) 140afe00251SAndrea Bittau goto out_invalid_option; 141afe00251SAndrea Bittau if (dccp_feat_confirm_recv(sk, opt, *value, 142afe00251SAndrea Bittau value + 1, len - 1)) 143afe00251SAndrea Bittau goto out_invalid_option; 144afe00251SAndrea Bittau break; 1457c657876SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_0: 146ae31c339SArnaldo Carvalho de Melo case DCCPO_ACK_VECTOR_1: 1477c657876SArnaldo Carvalho de Melo if (pkt_type == DCCP_PKT_DATA) 148e5a6de91SArnaldo Carvalho de Melo break; 1497c657876SArnaldo Carvalho de Melo 150a4bf3902SArnaldo Carvalho de Melo if (dccp_msk(sk)->dccpms_send_ack_vector && 151bdf13d20SAndrea Bittau dccp_ackvec_parse(sk, skb, &ackno, opt, value, len)) 152ae31c339SArnaldo Carvalho de Melo goto out_invalid_option; 1537c657876SArnaldo Carvalho de Melo break; 1547c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP: 1557c657876SArnaldo Carvalho de Melo if (len != 4) 1567c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1577c657876SArnaldo Carvalho de Melo 15860fe62e7SAndrea Bittau opt_recv->dccpor_timestamp = ntohl(*(__be32 *)value); 1597c657876SArnaldo Carvalho de Melo 1607c657876SArnaldo Carvalho de Melo dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp; 16119ac2146SArnaldo Carvalho de Melo dp->dccps_timestamp_time = ktime_get_real(); 1627c657876SArnaldo Carvalho de Melo 16309dbc389SGerrit Renker dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n", 16409dbc389SGerrit Renker dccp_role(sk), opt_recv->dccpor_timestamp, 165f6ccf554SDavid S. Miller (unsigned long long) 1667c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_ack_seq); 1677c657876SArnaldo Carvalho de Melo break; 1687c657876SArnaldo Carvalho de Melo case DCCPO_TIMESTAMP_ECHO: 1691bc09869SIan McDonald if (len != 4 && len != 6 && len != 8) 1707c657876SArnaldo Carvalho de Melo goto out_invalid_option; 1717c657876SArnaldo Carvalho de Melo 17260fe62e7SAndrea Bittau opt_recv->dccpor_timestamp_echo = ntohl(*(__be32 *)value); 1737c657876SArnaldo Carvalho de Melo 17409dbc389SGerrit Renker dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, " 175f73f7097SGerrit Renker "ackno=%llu", dccp_role(sk), 1767690af3fSArnaldo Carvalho de Melo opt_recv->dccpor_timestamp_echo, 177f6ccf554SDavid S. Miller len + 2, 178f6ccf554SDavid S. Miller (unsigned long long) 1791bc09869SIan McDonald DCCP_SKB_CB(skb)->dccpd_ack_seq); 1807c657876SArnaldo Carvalho de Melo 1811bc09869SIan McDonald 182f73f7097SGerrit Renker if (len == 4) { 183f73f7097SGerrit Renker dccp_pr_debug_cat("\n"); 1841c14ac0aSArnaldo Carvalho de Melo break; 185f73f7097SGerrit Renker } 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 192f73f7097SGerrit Renker dccp_pr_debug_cat(", ELAPSED_TIME=%d\n", elapsed_time); 193f73f7097SGerrit Renker 1941c14ac0aSArnaldo Carvalho de Melo /* Give precedence to the biggest ELAPSED_TIME */ 1951c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 1961c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 1977c657876SArnaldo Carvalho de Melo break; 1987c657876SArnaldo Carvalho de Melo case DCCPO_ELAPSED_TIME: 1991bc09869SIan McDonald if (len != 2 && len != 4) 2007c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2017c657876SArnaldo Carvalho de Melo 2027c657876SArnaldo Carvalho de Melo if (pkt_type == DCCP_PKT_DATA) 2037c657876SArnaldo Carvalho de Melo continue; 2041bc09869SIan McDonald 2051bc09869SIan McDonald if (len == 2) 20660fe62e7SAndrea Bittau elapsed_time = ntohs(*(__be16 *)value); 2071bc09869SIan McDonald else 20860fe62e7SAndrea Bittau elapsed_time = ntohl(*(__be32 *)value); 2091c14ac0aSArnaldo Carvalho de Melo 2101c14ac0aSArnaldo Carvalho de Melo if (elapsed_time > opt_recv->dccpor_elapsed_time) 2111c14ac0aSArnaldo Carvalho de Melo opt_recv->dccpor_elapsed_time = elapsed_time; 2121bc09869SIan McDonald 21309dbc389SGerrit Renker dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n", 21409dbc389SGerrit Renker dccp_role(sk), elapsed_time); 2157c657876SArnaldo Carvalho de Melo break; 2167c657876SArnaldo Carvalho de Melo /* 2170e64e94eSGerrit Renker * From RFC 4340, sec. 10.3: 2187c657876SArnaldo Carvalho de Melo * 2197690af3fSArnaldo Carvalho de Melo * Option numbers 128 through 191 are for 2207690af3fSArnaldo Carvalho de Melo * options sent from the HC-Sender to the 2217690af3fSArnaldo Carvalho de Melo * HC-Receiver; option numbers 192 through 255 2227690af3fSArnaldo Carvalho de Melo * are for options sent from the HC-Receiver to 2237690af3fSArnaldo Carvalho de Melo * the HC-Sender. 2247c657876SArnaldo Carvalho de Melo */ 2257c657876SArnaldo Carvalho de Melo case 128 ... 191: { 2267c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2277c657876SArnaldo Carvalho de Melo 2287690af3fSArnaldo Carvalho de Melo if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk, 2297690af3fSArnaldo Carvalho de Melo opt, len, idx, 2307690af3fSArnaldo Carvalho de Melo value) != 0) 2317c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2327c657876SArnaldo Carvalho de Melo } 2337c657876SArnaldo Carvalho de Melo break; 2347c657876SArnaldo Carvalho de Melo case 192 ... 255: { 2357c657876SArnaldo Carvalho de Melo const u16 idx = value - options; 2367c657876SArnaldo Carvalho de Melo 2377690af3fSArnaldo Carvalho de Melo if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk, 2387690af3fSArnaldo Carvalho de Melo opt, len, idx, 2397690af3fSArnaldo Carvalho de Melo value) != 0) 2407c657876SArnaldo Carvalho de Melo goto out_invalid_option; 2417c657876SArnaldo Carvalho de Melo } 2427c657876SArnaldo Carvalho de Melo break; 2437c657876SArnaldo Carvalho de Melo default: 24459348b19SGerrit Renker DCCP_CRIT("DCCP(%p): option %d(len=%d) not " 24559348b19SGerrit Renker "implemented, ignoring", sk, opt, len); 2467c657876SArnaldo Carvalho de Melo break; 2477c657876SArnaldo Carvalho de Melo } 248afe00251SAndrea Bittau 249afe00251SAndrea Bittau if (opt != DCCPO_MANDATORY) 250afe00251SAndrea Bittau mandatory = 0; 2517c657876SArnaldo Carvalho de Melo } 2527c657876SArnaldo Carvalho de Melo 2536df9424aSArnaldo Carvalho de Melo /* mandatory was the last byte in option list -> reset connection */ 2546df9424aSArnaldo Carvalho de Melo if (mandatory) 2556df9424aSArnaldo Carvalho de Melo goto out_invalid_option; 2566df9424aSArnaldo Carvalho de Melo 2577c657876SArnaldo Carvalho de Melo return 0; 2587c657876SArnaldo Carvalho de Melo 2597c657876SArnaldo Carvalho de Melo out_invalid_option: 2607c657876SArnaldo Carvalho de Melo DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); 2617c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; 26259348b19SGerrit Renker DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len); 2637c657876SArnaldo Carvalho de Melo return -1; 2647c657876SArnaldo Carvalho de Melo } 2657c657876SArnaldo Carvalho de Melo 266b61fafc4SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_parse_options); 267b61fafc4SArnaldo Carvalho de Melo 2687c657876SArnaldo Carvalho de Melo static void dccp_encode_value_var(const u32 value, unsigned char *to, 2697c657876SArnaldo Carvalho de Melo const unsigned int len) 2707c657876SArnaldo Carvalho de Melo { 2717c657876SArnaldo Carvalho de Melo if (len > 3) 2727c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF000000) >> 24; 2737c657876SArnaldo Carvalho de Melo if (len > 2) 2747c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF0000) >> 16; 2757c657876SArnaldo Carvalho de Melo if (len > 1) 2767c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF00) >> 8; 2777c657876SArnaldo Carvalho de Melo if (len > 0) 2787c657876SArnaldo Carvalho de Melo *to++ = (value & 0xFF); 2797c657876SArnaldo Carvalho de Melo } 2807c657876SArnaldo Carvalho de Melo 2817c657876SArnaldo Carvalho de Melo static inline int dccp_ndp_len(const int ndp) 2827c657876SArnaldo Carvalho de Melo { 2837c657876SArnaldo Carvalho de Melo return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3; 2847c657876SArnaldo Carvalho de Melo } 2857c657876SArnaldo Carvalho de Melo 2862d0817d1SArnaldo Carvalho de Melo int dccp_insert_option(struct sock *sk, struct sk_buff *skb, 2877c657876SArnaldo Carvalho de Melo const unsigned char option, 2887c657876SArnaldo Carvalho de Melo const void *value, const unsigned char len) 2897c657876SArnaldo Carvalho de Melo { 2907c657876SArnaldo Carvalho de Melo unsigned char *to; 2917c657876SArnaldo Carvalho de Melo 2922d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) 2932d0817d1SArnaldo Carvalho de Melo return -1; 2947c657876SArnaldo Carvalho de Melo 2957c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2; 2967c657876SArnaldo Carvalho de Melo 2977c657876SArnaldo Carvalho de Melo to = skb_push(skb, len + 2); 2987c657876SArnaldo Carvalho de Melo *to++ = option; 2997c657876SArnaldo Carvalho de Melo *to++ = len + 2; 3007c657876SArnaldo Carvalho de Melo 3017c657876SArnaldo Carvalho de Melo memcpy(to, value, len); 3022d0817d1SArnaldo Carvalho de Melo return 0; 3037c657876SArnaldo Carvalho de Melo } 3047c657876SArnaldo Carvalho de Melo 3057c657876SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option); 3067c657876SArnaldo Carvalho de Melo 3072d0817d1SArnaldo Carvalho de Melo static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb) 3087c657876SArnaldo Carvalho de Melo { 3097c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 3107c657876SArnaldo Carvalho de Melo int ndp = dp->dccps_ndp_count; 3117c657876SArnaldo Carvalho de Melo 3127c657876SArnaldo Carvalho de Melo if (dccp_non_data_packet(skb)) 3137c657876SArnaldo Carvalho de Melo ++dp->dccps_ndp_count; 3147c657876SArnaldo Carvalho de Melo else 3157c657876SArnaldo Carvalho de Melo dp->dccps_ndp_count = 0; 3167c657876SArnaldo Carvalho de Melo 3177c657876SArnaldo Carvalho de Melo if (ndp > 0) { 3187c657876SArnaldo Carvalho de Melo unsigned char *ptr; 3197c657876SArnaldo Carvalho de Melo const int ndp_len = dccp_ndp_len(ndp); 3207c657876SArnaldo Carvalho de Melo const int len = ndp_len + 2; 3217c657876SArnaldo Carvalho de Melo 3227c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 3232d0817d1SArnaldo Carvalho de Melo return -1; 3247c657876SArnaldo Carvalho de Melo 3257c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3267c657876SArnaldo Carvalho de Melo 3277c657876SArnaldo Carvalho de Melo ptr = skb_push(skb, len); 3287c657876SArnaldo Carvalho de Melo *ptr++ = DCCPO_NDP_COUNT; 3297c657876SArnaldo Carvalho de Melo *ptr++ = len; 3307c657876SArnaldo Carvalho de Melo dccp_encode_value_var(ndp, ptr, ndp_len); 3317c657876SArnaldo Carvalho de Melo } 3322d0817d1SArnaldo Carvalho de Melo 3332d0817d1SArnaldo Carvalho de Melo return 0; 3347c657876SArnaldo Carvalho de Melo } 3357c657876SArnaldo Carvalho de Melo 3367c657876SArnaldo Carvalho de Melo static inline int dccp_elapsed_time_len(const u32 elapsed_time) 3377c657876SArnaldo Carvalho de Melo { 338b1c9fe7bSIan McDonald return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; 3397c657876SArnaldo Carvalho de Melo } 3407c657876SArnaldo Carvalho de Melo 3412d0817d1SArnaldo Carvalho de Melo int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb, 3427c657876SArnaldo Carvalho de Melo u32 elapsed_time) 3437c657876SArnaldo Carvalho de Melo { 3447c657876SArnaldo Carvalho de Melo const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 3457c657876SArnaldo Carvalho de Melo const int len = 2 + elapsed_time_len; 3467c657876SArnaldo Carvalho de Melo unsigned char *to; 3477c657876SArnaldo Carvalho de Melo 3481bc09869SIan McDonald if (elapsed_time_len == 0) 3492d0817d1SArnaldo Carvalho de Melo return 0; 3507c657876SArnaldo Carvalho de Melo 3512d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 3522d0817d1SArnaldo Carvalho de Melo return -1; 3537c657876SArnaldo Carvalho de Melo 3547c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += len; 3557c657876SArnaldo Carvalho de Melo 3567c657876SArnaldo Carvalho de Melo to = skb_push(skb, len); 3577c657876SArnaldo Carvalho de Melo *to++ = DCCPO_ELAPSED_TIME; 3587c657876SArnaldo Carvalho de Melo *to++ = len; 3597c657876SArnaldo Carvalho de Melo 3601bc09869SIan McDonald if (elapsed_time_len == 2) { 36160fe62e7SAndrea Bittau const __be16 var16 = htons((u16)elapsed_time); 3621bc09869SIan McDonald memcpy(to, &var16, 2); 3631bc09869SIan McDonald } else { 36460fe62e7SAndrea Bittau const __be32 var32 = htonl(elapsed_time); 3651bc09869SIan McDonald memcpy(to, &var32, 4); 3661bc09869SIan McDonald } 3677c657876SArnaldo Carvalho de Melo 3682d0817d1SArnaldo Carvalho de Melo return 0; 3697c657876SArnaldo Carvalho de Melo } 3707c657876SArnaldo Carvalho de Melo 371d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time); 3727c657876SArnaldo Carvalho de Melo 373b0e56780SArnaldo Carvalho de Melo void dccp_timestamp(const struct sock *sk, struct timeval *tv) 374b0e56780SArnaldo Carvalho de Melo { 375b0e56780SArnaldo Carvalho de Melo const struct dccp_sock *dp = dccp_sk(sk); 376b0e56780SArnaldo Carvalho de Melo 377b0e56780SArnaldo Carvalho de Melo do_gettimeofday(tv); 378b0e56780SArnaldo Carvalho de Melo tv->tv_sec -= dp->dccps_epoch.tv_sec; 379b0e56780SArnaldo Carvalho de Melo tv->tv_usec -= dp->dccps_epoch.tv_usec; 380b0e56780SArnaldo Carvalho de Melo 381b0e56780SArnaldo Carvalho de Melo while (tv->tv_usec < 0) { 382b0e56780SArnaldo Carvalho de Melo tv->tv_sec--; 383b0e56780SArnaldo Carvalho de Melo tv->tv_usec += USEC_PER_SEC; 384b0e56780SArnaldo Carvalho de Melo } 385b0e56780SArnaldo Carvalho de Melo } 386b0e56780SArnaldo Carvalho de Melo 387b0e56780SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_timestamp); 388b0e56780SArnaldo Carvalho de Melo 3892d0817d1SArnaldo Carvalho de Melo int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb) 3907c657876SArnaldo Carvalho de Melo { 3911bc09869SIan McDonald struct timeval tv; 39260fe62e7SAndrea Bittau __be32 now; 3931bc09869SIan McDonald 394b0e56780SArnaldo Carvalho de Melo dccp_timestamp(sk, &tv); 39560fe62e7SAndrea Bittau now = htonl(timeval_usecs(&tv) / 10); 3961bc09869SIan McDonald /* yes this will overflow but that is the point as we want a 3971bc09869SIan McDonald * 10 usec 32 bit timer which mean it wraps every 11.9 hours */ 3981bc09869SIan McDonald 3992d0817d1SArnaldo Carvalho de Melo return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now)); 4007c657876SArnaldo Carvalho de Melo } 4017c657876SArnaldo Carvalho de Melo 402d4b81ff7SArnaldo Carvalho de Melo EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp); 403d4b81ff7SArnaldo Carvalho de Melo 4042d0817d1SArnaldo Carvalho de Melo static int dccp_insert_option_timestamp_echo(struct sock *sk, 4057690af3fSArnaldo Carvalho de Melo struct sk_buff *skb) 4067c657876SArnaldo Carvalho de Melo { 4077c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 40860fe62e7SAndrea Bittau __be32 tstamp_echo; 409b0e56780SArnaldo Carvalho de Melo int len, elapsed_time_len; 4107c657876SArnaldo Carvalho de Melo unsigned char *to; 41119ac2146SArnaldo Carvalho de Melo const suseconds_t delta = ktime_us_delta(ktime_get_real(), 41219ac2146SArnaldo Carvalho de Melo dp->dccps_timestamp_time); 41319ac2146SArnaldo Carvalho de Melo u32 elapsed_time = delta / 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; 43919ac2146SArnaldo Carvalho de Melo dp->dccps_timestamp_time = ktime_set(0, 0); 4402d0817d1SArnaldo Carvalho de Melo return 0; 4417c657876SArnaldo Carvalho de Melo } 4427c657876SArnaldo Carvalho de Melo 443afe00251SAndrea Bittau static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat, 444afe00251SAndrea Bittau u8 *val, u8 len) 445afe00251SAndrea Bittau { 446afe00251SAndrea Bittau u8 *to; 447afe00251SAndrea Bittau 448afe00251SAndrea Bittau if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { 44959348b19SGerrit Renker DCCP_WARN("packet too small for feature %d option!\n", feat); 450afe00251SAndrea Bittau return -1; 451afe00251SAndrea Bittau } 452afe00251SAndrea Bittau 453afe00251SAndrea Bittau DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3; 454afe00251SAndrea Bittau 455afe00251SAndrea Bittau to = skb_push(skb, len + 3); 456afe00251SAndrea Bittau *to++ = type; 457afe00251SAndrea Bittau *to++ = len + 3; 458afe00251SAndrea Bittau *to++ = feat; 459afe00251SAndrea Bittau 460afe00251SAndrea Bittau if (len) 461afe00251SAndrea Bittau memcpy(to, val, len); 462afe00251SAndrea Bittau 463c02fdc0eSGerrit Renker dccp_pr_debug("%s(%s (%d), ...), length %d\n", 464c02fdc0eSGerrit Renker dccp_feat_typename(type), 465c02fdc0eSGerrit Renker dccp_feat_name(feat), feat, len); 466afe00251SAndrea Bittau return 0; 467afe00251SAndrea Bittau } 468afe00251SAndrea Bittau 4692d0817d1SArnaldo Carvalho de Melo static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb) 470afe00251SAndrea Bittau { 471afe00251SAndrea Bittau struct dccp_sock *dp = dccp_sk(sk); 472a4bf3902SArnaldo Carvalho de Melo struct dccp_minisock *dmsk = dccp_msk(sk); 473afe00251SAndrea Bittau struct dccp_opt_pend *opt, *next; 474afe00251SAndrea Bittau int change = 0; 475afe00251SAndrea Bittau 476afe00251SAndrea Bittau /* confirm any options [NN opts] */ 477a4bf3902SArnaldo Carvalho de Melo list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) { 478afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 479afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 480afe00251SAndrea Bittau opt->dccpop_len); 481afe00251SAndrea Bittau /* fear empty confirms */ 482afe00251SAndrea Bittau if (opt->dccpop_val) 483afe00251SAndrea Bittau kfree(opt->dccpop_val); 484afe00251SAndrea Bittau kfree(opt); 485afe00251SAndrea Bittau } 486a4bf3902SArnaldo Carvalho de Melo INIT_LIST_HEAD(&dmsk->dccpms_conf); 487afe00251SAndrea Bittau 488afe00251SAndrea Bittau /* see which features we need to send */ 489a4bf3902SArnaldo Carvalho de Melo list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) { 490afe00251SAndrea Bittau /* see if we need to send any confirm */ 491afe00251SAndrea Bittau if (opt->dccpop_sc) { 492afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type + 1, 493afe00251SAndrea Bittau opt->dccpop_feat, 494afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_val, 495afe00251SAndrea Bittau opt->dccpop_sc->dccpoc_len); 496afe00251SAndrea Bittau 497afe00251SAndrea Bittau BUG_ON(!opt->dccpop_sc->dccpoc_val); 498afe00251SAndrea Bittau kfree(opt->dccpop_sc->dccpoc_val); 499afe00251SAndrea Bittau kfree(opt->dccpop_sc); 500afe00251SAndrea Bittau opt->dccpop_sc = NULL; 501afe00251SAndrea Bittau } 502afe00251SAndrea Bittau 503afe00251SAndrea Bittau /* any option not confirmed, re-send it */ 504afe00251SAndrea Bittau if (!opt->dccpop_conf) { 505afe00251SAndrea Bittau dccp_insert_feat_opt(skb, opt->dccpop_type, 506afe00251SAndrea Bittau opt->dccpop_feat, opt->dccpop_val, 507afe00251SAndrea Bittau opt->dccpop_len); 508afe00251SAndrea Bittau change++; 509afe00251SAndrea Bittau } 510afe00251SAndrea Bittau } 511afe00251SAndrea Bittau 512afe00251SAndrea Bittau /* Retransmit timer. 513afe00251SAndrea Bittau * If this is the master listening sock, we don't set a timer on it. It 514afe00251SAndrea Bittau * should be fine because if the dude doesn't receive our RESPONSE 515afe00251SAndrea Bittau * [which will contain the CHANGE] he will send another REQUEST which 516afe00251SAndrea Bittau * will "retrnasmit" the change. 517afe00251SAndrea Bittau */ 518afe00251SAndrea Bittau if (change && dp->dccps_role != DCCP_ROLE_LISTEN) { 519afe00251SAndrea Bittau dccp_pr_debug("reset feat negotiation timer %p\n", sk); 520afe00251SAndrea Bittau 521afe00251SAndrea Bittau /* XXX don't reset the timer on re-transmissions. I.e. reset it 522afe00251SAndrea Bittau * only when sending new stuff i guess. Currently the timer 523afe00251SAndrea Bittau * never backs off because on re-transmission it just resets it! 524afe00251SAndrea Bittau */ 525afe00251SAndrea Bittau inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, 526afe00251SAndrea Bittau inet_csk(sk)->icsk_rto, DCCP_RTO_MAX); 527afe00251SAndrea Bittau } 5282d0817d1SArnaldo Carvalho de Melo 5292d0817d1SArnaldo Carvalho de Melo return 0; 530afe00251SAndrea Bittau } 531afe00251SAndrea Bittau 5322d0817d1SArnaldo Carvalho de Melo int dccp_insert_options(struct sock *sk, struct sk_buff *skb) 5337c657876SArnaldo Carvalho de Melo { 5347c657876SArnaldo Carvalho de Melo struct dccp_sock *dp = dccp_sk(sk); 535a4bf3902SArnaldo Carvalho de Melo struct dccp_minisock *dmsk = dccp_msk(sk); 5367c657876SArnaldo Carvalho de Melo 5377c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len = 0; 5387c657876SArnaldo Carvalho de Melo 539a4bf3902SArnaldo Carvalho de Melo if (dmsk->dccpms_send_ndp_count && 5402d0817d1SArnaldo Carvalho de Melo dccp_insert_option_ndp(sk, skb)) 5412d0817d1SArnaldo Carvalho de Melo return -1; 5427c657876SArnaldo Carvalho de Melo 5437c657876SArnaldo Carvalho de Melo if (!dccp_packet_without_ack(skb)) { 544a4bf3902SArnaldo Carvalho de Melo if (dmsk->dccpms_send_ack_vector && 5452d0817d1SArnaldo Carvalho de Melo dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) && 5462d0817d1SArnaldo Carvalho de Melo dccp_insert_option_ackvec(sk, skb)) 5472d0817d1SArnaldo Carvalho de Melo return -1; 5482d0817d1SArnaldo Carvalho de Melo 5492d0817d1SArnaldo Carvalho de Melo if (dp->dccps_timestamp_echo != 0 && 5502d0817d1SArnaldo Carvalho de Melo dccp_insert_option_timestamp_echo(sk, skb)) 5512d0817d1SArnaldo Carvalho de Melo return -1; 5527c657876SArnaldo Carvalho de Melo } 5537c657876SArnaldo Carvalho de Melo 554507d37cfSArnaldo Carvalho de Melo if (dp->dccps_hc_rx_insert_options) { 5552d0817d1SArnaldo Carvalho de Melo if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb)) 5562d0817d1SArnaldo Carvalho de Melo return -1; 557507d37cfSArnaldo Carvalho de Melo dp->dccps_hc_rx_insert_options = 0; 558507d37cfSArnaldo Carvalho de Melo } 5597c657876SArnaldo Carvalho de Melo 560afe00251SAndrea Bittau /* Feature negotiation */ 561afe00251SAndrea Bittau /* Data packets can't do feat negotiation */ 5622d0817d1SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA && 5632d0817d1SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK && 5642d0817d1SArnaldo Carvalho de Melo dccp_insert_options_feat(sk, skb)) 5652d0817d1SArnaldo Carvalho de Melo return -1; 566afe00251SAndrea Bittau 56789560b53SGerrit Renker /* 56889560b53SGerrit Renker * Obtain RTT sample from Request/Response exchange. 56989560b53SGerrit Renker * This is currently used in CCID 3 initialisation. 57089560b53SGerrit Renker */ 57189560b53SGerrit Renker if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST && 57289560b53SGerrit Renker dccp_insert_option_timestamp(sk, skb)) 57389560b53SGerrit Renker return -1; 57489560b53SGerrit Renker 5757c657876SArnaldo Carvalho de Melo /* XXX: insert other options when appropriate */ 5767c657876SArnaldo Carvalho de Melo 5777c657876SArnaldo Carvalho de Melo if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) { 5787c657876SArnaldo Carvalho de Melo /* The length of all options has to be a multiple of 4 */ 5797c657876SArnaldo Carvalho de Melo int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4; 5807c657876SArnaldo Carvalho de Melo 5817c657876SArnaldo Carvalho de Melo if (padding != 0) { 5827c657876SArnaldo Carvalho de Melo padding = 4 - padding; 5837c657876SArnaldo Carvalho de Melo memset(skb_push(skb, padding), 0, padding); 5847c657876SArnaldo Carvalho de Melo DCCP_SKB_CB(skb)->dccpd_opt_len += padding; 5857c657876SArnaldo Carvalho de Melo } 5867c657876SArnaldo Carvalho de Melo } 5872d0817d1SArnaldo Carvalho de Melo 5882d0817d1SArnaldo Carvalho de Melo return 0; 5897c657876SArnaldo Carvalho de Melo } 590