2005-08-09 21:14:34 -06:00
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/*
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* net/dccp/options.c
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*
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* An implementation of the DCCP protocol
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2005-08-19 21:23:43 -06:00
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* Copyright (c) 2005 Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
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* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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2006-08-26 20:01:30 -06:00
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* Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
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2005-08-09 21:14:34 -06:00
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/dccp.h>
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#include <linux/module.h>
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#include <linux/types.h>
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2007-10-24 06:46:58 -06:00
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#include <asm/unaligned.h>
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2005-08-09 21:14:34 -06:00
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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2005-09-18 01:17:51 -06:00
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#include "ackvec.h"
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2005-08-09 21:14:34 -06:00
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#include "ccid.h"
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#include "dccp.h"
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[DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!
18:38:52.174934 127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526 127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398 127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>
:-)
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:43:56 -07:00
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#include "feat.h"
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2005-08-09 21:14:34 -06:00
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2008-09-09 05:27:22 -06:00
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int sysctl_dccp_feat_sequence_window = DCCPF_INITIAL_SEQUENCE_WINDOW;
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int sysctl_dccp_feat_rx_ccid = DCCPF_INITIAL_CCID;
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int sysctl_dccp_feat_tx_ccid = DCCPF_INITIAL_CCID;
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int sysctl_dccp_feat_send_ack_vector = DCCPF_INITIAL_SEND_ACK_VECTOR;
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int sysctl_dccp_feat_send_ndp_count = DCCPF_INITIAL_SEND_NDP_COUNT;
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2008-11-23 17:07:53 -07:00
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u64 dccp_decode_value_var(const u8 *bf, const u8 len)
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2005-08-09 21:14:34 -06:00
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{
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2008-11-23 17:07:53 -07:00
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u64 value = 0;
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2005-08-09 21:14:34 -06:00
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2008-11-23 17:07:53 -07:00
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if (len >= DCCP_OPTVAL_MAXLEN)
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value += ((u64)*bf++) << 40;
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if (len > 4)
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value += ((u64)*bf++) << 32;
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2005-08-09 21:14:34 -06:00
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if (len > 3)
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2008-11-23 17:07:53 -07:00
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value += ((u64)*bf++) << 24;
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2005-08-09 21:14:34 -06:00
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if (len > 2)
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2008-11-23 17:07:53 -07:00
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value += ((u64)*bf++) << 16;
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2005-08-09 21:14:34 -06:00
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if (len > 1)
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2008-11-23 17:07:53 -07:00
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value += ((u64)*bf++) << 8;
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2005-08-09 21:14:34 -06:00
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if (len > 0)
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value += *bf;
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return value;
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}
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2007-12-13 07:29:24 -07:00
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/**
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* dccp_parse_options - Parse DCCP options present in @skb
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* @sk: client|server|listening dccp socket (when @dreq != NULL)
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* @dreq: request socket to use during connection setup, or NULL
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*/
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int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
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struct sk_buff *skb)
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2005-08-09 21:14:34 -06:00
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{
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struct dccp_sock *dp = dccp_sk(sk);
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const struct dccp_hdr *dh = dccp_hdr(skb);
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const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
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2008-09-09 05:27:22 -06:00
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u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
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2005-08-09 21:14:34 -06:00
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unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
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unsigned char *opt_ptr = options;
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2005-08-13 17:34:54 -06:00
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const unsigned char *opt_end = (unsigned char *)dh +
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(dh->dccph_doff * 4);
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2005-08-09 21:14:34 -06:00
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struct dccp_options_received *opt_recv = &dp->dccps_options_received;
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unsigned char opt, len;
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2008-11-25 17:57:30 -07:00
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unsigned char *uninitialized_var(value);
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2005-09-08 23:32:01 -06:00
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u32 elapsed_time;
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2007-10-24 06:46:58 -06:00
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__be32 opt_val;
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[DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!
18:38:52.174934 127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526 127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398 127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>
:-)
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:43:56 -07:00
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int rc;
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int mandatory = 0;
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2005-08-09 21:14:34 -06:00
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memset(opt_recv, 0, sizeof(*opt_recv));
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2006-03-20 23:36:01 -07:00
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opt = len = 0;
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2005-08-09 21:14:34 -06:00
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while (opt_ptr != opt_end) {
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opt = *opt_ptr++;
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len = 0;
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value = NULL;
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/* Check if this isn't a single byte option */
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if (opt > DCCPO_MAX_RESERVED) {
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if (opt_ptr == opt_end)
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2008-08-23 05:28:27 -06:00
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goto out_nonsensical_length;
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2005-08-09 21:14:34 -06:00
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len = *opt_ptr++;
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2008-08-23 05:28:27 -06:00
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if (len < 2)
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goto out_nonsensical_length;
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2005-08-09 21:14:34 -06:00
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/*
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* Remove the type and len fields, leaving
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* just the value size
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*/
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len -= 2;
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value = opt_ptr;
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opt_ptr += len;
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if (opt_ptr > opt_end)
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2008-08-23 05:28:27 -06:00
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goto out_nonsensical_length;
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2005-08-09 21:14:34 -06:00
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}
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2007-12-13 07:29:24 -07:00
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/*
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2008-09-09 05:27:22 -06:00
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* CCID-Specific Options (from RFC 4340, sec. 10.3):
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*
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* Option numbers 128 through 191 are for options sent from the
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* HC-Sender to the HC-Receiver; option numbers 192 through 255
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* are for options sent from the HC-Receiver to the HC-Sender.
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*
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2007-12-13 07:29:24 -07:00
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* CCID-specific options are ignored during connection setup, as
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* negotiation may still be in progress (see RFC 4340, 10.3).
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2008-06-11 04:19:09 -06:00
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* The same applies to Ack Vectors, as these depend on the CCID.
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2008-09-09 05:27:22 -06:00
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*
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2007-12-13 07:29:24 -07:00
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*/
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2008-09-09 05:27:22 -06:00
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if (dreq != NULL && (opt >= 128 ||
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2008-06-11 04:19:09 -06:00
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opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
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2007-12-13 07:29:24 -07:00
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goto ignore_option;
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2005-08-09 21:14:34 -06:00
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switch (opt) {
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case DCCPO_PADDING:
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break;
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[DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!
18:38:52.174934 127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526 127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398 127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>
:-)
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:43:56 -07:00
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case DCCPO_MANDATORY:
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if (mandatory)
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goto out_invalid_option;
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2006-03-20 23:06:02 -07:00
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if (pkt_type != DCCP_PKT_DATA)
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mandatory = 1;
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[DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!
18:38:52.174934 127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526 127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398 127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>
:-)
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:43:56 -07:00
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break;
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2005-08-09 21:14:34 -06:00
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case DCCPO_NDP_COUNT:
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2008-07-13 04:51:40 -06:00
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if (len > 6)
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2005-08-09 21:14:34 -06:00
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goto out_invalid_option;
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opt_recv->dccpor_ndp = dccp_decode_value_var(value, len);
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2008-07-13 04:51:40 -06:00
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dccp_pr_debug("%s opt: NDP count=%llu\n", dccp_role(sk),
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(unsigned long long)opt_recv->dccpor_ndp);
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2005-08-09 21:14:34 -06:00
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break;
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2008-09-09 05:27:22 -06:00
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case DCCPO_CHANGE_L:
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/* fall through */
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case DCCPO_CHANGE_R:
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if (pkt_type == DCCP_PKT_DATA)
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2007-12-13 07:48:19 -07:00
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break;
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2008-09-09 05:27:22 -06:00
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if (len < 2)
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goto out_invalid_option;
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rc = dccp_feat_change_recv(sk, opt, *value, value + 1,
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len - 1);
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/*
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* When there is a change error, change_recv is
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* responsible for dealing with it. i.e. reply with an
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* empty confirm.
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* If the change was mandatory, then we need to die.
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*/
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if (rc && mandatory)
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goto out_invalid_option;
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break;
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case DCCPO_CONFIRM_L:
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/* fall through */
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case DCCPO_CONFIRM_R:
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if (pkt_type == DCCP_PKT_DATA)
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break;
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if (len < 2) /* FIXME this disallows empty confirm */
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goto out_invalid_option;
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if (dccp_feat_confirm_recv(sk, opt, *value,
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value + 1, len - 1))
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goto out_invalid_option;
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break;
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case DCCPO_ACK_VECTOR_0:
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case DCCPO_ACK_VECTOR_1:
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if (dccp_packet_without_ack(skb)) /* RFC 4340, 11.4 */
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break;
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if (dccp_msk(sk)->dccpms_send_ack_vector &&
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dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
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goto out_invalid_option;
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[DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!
18:38:52.174934 127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526 127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398 127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>
:-)
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:43:56 -07:00
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break;
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2005-08-09 21:14:34 -06:00
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case DCCPO_TIMESTAMP:
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if (len != 4)
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goto out_invalid_option;
|
[DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
* timestamps are recorded on the listening socket;
* Responses are sent from dccp_request_sockets;
* suppose two connections reach the listening socket with very small time in between:
* the first timestamp value gets overwritten by the second connection request.
This is not really good, so this patch separates timestamps into
* those which are received by the server during the initial handshake (on dccp_request_sock);
* those which are received by the client or the client after connection establishment.
As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).
The timestamp-echoing now works as follows:
* when a timestamp is present on the initial Request, it is placed into dreq, due to the
call to dccp_parse_options in dccp_v{4,6}_conn_request;
* when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
from the request_sock into the child cocket in dccp_create_openreq_child;
* timestamps received on an (established) dccp_sock are treated as before.
Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.
Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-13 07:37:19 -07:00
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/*
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* RFC 4340 13.1: "The precise time corresponding to
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* Timestamp Value zero is not specified". We use
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* zero to indicate absence of a meaningful timestamp.
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*/
|
2007-10-24 06:46:58 -06:00
|
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opt_val = get_unaligned((__be32 *)value);
|
[DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
* timestamps are recorded on the listening socket;
* Responses are sent from dccp_request_sockets;
* suppose two connections reach the listening socket with very small time in between:
* the first timestamp value gets overwritten by the second connection request.
This is not really good, so this patch separates timestamps into
* those which are received by the server during the initial handshake (on dccp_request_sock);
* those which are received by the client or the client after connection establishment.
As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).
The timestamp-echoing now works as follows:
* when a timestamp is present on the initial Request, it is placed into dreq, due to the
call to dccp_parse_options in dccp_v{4,6}_conn_request;
* when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
from the request_sock into the child cocket in dccp_create_openreq_child;
* timestamps received on an (established) dccp_sock are treated as before.
Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.
Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-13 07:37:19 -07:00
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|
|
if (unlikely(opt_val == 0)) {
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|
DCCP_WARN("Timestamp with zero value\n");
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break;
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}
|
2005-08-09 21:14:34 -06:00
|
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|
[DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
* timestamps are recorded on the listening socket;
* Responses are sent from dccp_request_sockets;
* suppose two connections reach the listening socket with very small time in between:
* the first timestamp value gets overwritten by the second connection request.
This is not really good, so this patch separates timestamps into
* those which are received by the server during the initial handshake (on dccp_request_sock);
* those which are received by the client or the client after connection establishment.
As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).
The timestamp-echoing now works as follows:
* when a timestamp is present on the initial Request, it is placed into dreq, due to the
call to dccp_parse_options in dccp_v{4,6}_conn_request;
* when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
from the request_sock into the child cocket in dccp_create_openreq_child;
* timestamps received on an (established) dccp_sock are treated as before.
Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.
Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-13 07:37:19 -07:00
|
|
|
if (dreq != NULL) {
|
|
|
|
dreq->dreq_timestamp_echo = ntohl(opt_val);
|
|
|
|
dreq->dreq_timestamp_time = dccp_timestamp();
|
|
|
|
} else {
|
|
|
|
opt_recv->dccpor_timestamp =
|
|
|
|
dp->dccps_timestamp_echo = ntohl(opt_val);
|
|
|
|
dp->dccps_timestamp_time = dccp_timestamp();
|
|
|
|
}
|
2006-11-14 07:57:34 -07:00
|
|
|
dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n",
|
[DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
* timestamps are recorded on the listening socket;
* Responses are sent from dccp_request_sockets;
* suppose two connections reach the listening socket with very small time in between:
* the first timestamp value gets overwritten by the second connection request.
This is not really good, so this patch separates timestamps into
* those which are received by the server during the initial handshake (on dccp_request_sock);
* those which are received by the client or the client after connection establishment.
As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).
The timestamp-echoing now works as follows:
* when a timestamp is present on the initial Request, it is placed into dreq, due to the
call to dccp_parse_options in dccp_v{4,6}_conn_request;
* when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
from the request_sock into the child cocket in dccp_create_openreq_child;
* timestamps received on an (established) dccp_sock are treated as before.
Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.
Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-13 07:37:19 -07:00
|
|
|
dccp_role(sk), ntohl(opt_val),
|
2005-08-09 21:27:14 -06:00
|
|
|
(unsigned long long)
|
2005-08-09 21:14:34 -06:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_ack_seq);
|
|
|
|
break;
|
|
|
|
case DCCPO_TIMESTAMP_ECHO:
|
2005-08-19 21:23:43 -06:00
|
|
|
if (len != 4 && len != 6 && len != 8)
|
2005-08-09 21:14:34 -06:00
|
|
|
goto out_invalid_option;
|
|
|
|
|
2007-10-24 06:46:58 -06:00
|
|
|
opt_val = get_unaligned((__be32 *)value);
|
|
|
|
opt_recv->dccpor_timestamp_echo = ntohl(opt_val);
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2006-11-14 07:57:34 -07:00
|
|
|
dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
|
2007-04-20 14:56:47 -06:00
|
|
|
"ackno=%llu", dccp_role(sk),
|
2005-08-13 17:34:54 -06:00
|
|
|
opt_recv->dccpor_timestamp_echo,
|
2005-08-09 21:27:14 -06:00
|
|
|
len + 2,
|
|
|
|
(unsigned long long)
|
2005-08-19 21:23:43 -06:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_ack_seq);
|
|
|
|
|
2007-10-24 06:46:58 -06:00
|
|
|
value += 4;
|
2005-08-19 21:23:43 -06:00
|
|
|
|
2007-10-24 06:46:58 -06:00
|
|
|
if (len == 4) { /* no elapsed time included */
|
2007-04-20 14:56:47 -06:00
|
|
|
dccp_pr_debug_cat("\n");
|
2005-09-08 23:32:01 -06:00
|
|
|
break;
|
2007-04-20 14:56:47 -06:00
|
|
|
}
|
2005-09-08 23:32:01 -06:00
|
|
|
|
2007-10-24 06:46:58 -06:00
|
|
|
if (len == 6) { /* 2-byte elapsed time */
|
|
|
|
__be16 opt_val2 = get_unaligned((__be16 *)value);
|
|
|
|
elapsed_time = ntohs(opt_val2);
|
|
|
|
} else { /* 4-byte elapsed time */
|
|
|
|
opt_val = get_unaligned((__be32 *)value);
|
|
|
|
elapsed_time = ntohl(opt_val);
|
|
|
|
}
|
2005-09-08 23:32:01 -06:00
|
|
|
|
2007-10-04 15:44:01 -06:00
|
|
|
dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);
|
2007-04-20 14:56:47 -06:00
|
|
|
|
2005-09-08 23:32:01 -06:00
|
|
|
/* Give precedence to the biggest ELAPSED_TIME */
|
|
|
|
if (elapsed_time > opt_recv->dccpor_elapsed_time)
|
|
|
|
opt_recv->dccpor_elapsed_time = elapsed_time;
|
2005-08-09 21:14:34 -06:00
|
|
|
break;
|
|
|
|
case DCCPO_ELAPSED_TIME:
|
2007-11-21 05:13:53 -07:00
|
|
|
if (dccp_packet_without_ack(skb)) /* RFC 4340, 13.2 */
|
|
|
|
break;
|
2005-08-19 21:23:43 -06:00
|
|
|
|
2007-10-24 06:46:58 -06:00
|
|
|
if (len == 2) {
|
|
|
|
__be16 opt_val2 = get_unaligned((__be16 *)value);
|
|
|
|
elapsed_time = ntohs(opt_val2);
|
2007-11-21 05:13:53 -07:00
|
|
|
} else if (len == 4) {
|
2007-10-24 06:46:58 -06:00
|
|
|
opt_val = get_unaligned((__be32 *)value);
|
|
|
|
elapsed_time = ntohl(opt_val);
|
2007-11-21 05:13:53 -07:00
|
|
|
} else {
|
|
|
|
goto out_invalid_option;
|
2007-10-24 06:46:58 -06:00
|
|
|
}
|
2005-09-08 23:32:01 -06:00
|
|
|
|
|
|
|
if (elapsed_time > opt_recv->dccpor_elapsed_time)
|
|
|
|
opt_recv->dccpor_elapsed_time = elapsed_time;
|
2005-08-19 21:23:43 -06:00
|
|
|
|
2006-11-14 07:57:34 -07:00
|
|
|
dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
|
|
|
|
dccp_role(sk), elapsed_time);
|
2005-08-09 21:14:34 -06:00
|
|
|
break;
|
2008-09-09 05:27:22 -06:00
|
|
|
case 128 ... 191: {
|
|
|
|
const u16 idx = value - options;
|
|
|
|
|
2005-08-13 17:34:54 -06:00
|
|
|
if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
|
2008-09-09 05:27:22 -06:00
|
|
|
opt, len, idx,
|
|
|
|
value) != 0)
|
2005-08-09 21:14:34 -06:00
|
|
|
goto out_invalid_option;
|
2008-09-09 05:27:22 -06:00
|
|
|
}
|
2005-08-09 21:14:34 -06:00
|
|
|
break;
|
2008-09-09 05:27:22 -06:00
|
|
|
case 192 ... 255: {
|
|
|
|
const u16 idx = value - options;
|
|
|
|
|
2005-08-13 17:34:54 -06:00
|
|
|
if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
|
2008-09-09 05:27:22 -06:00
|
|
|
opt, len, idx,
|
|
|
|
value) != 0)
|
2005-08-09 21:14:34 -06:00
|
|
|
goto out_invalid_option;
|
2008-09-09 05:27:22 -06:00
|
|
|
}
|
2005-08-09 21:14:34 -06:00
|
|
|
break;
|
|
|
|
default:
|
2006-11-20 13:39:23 -07:00
|
|
|
DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
|
|
|
|
"implemented, ignoring", sk, opt, len);
|
2005-08-09 21:14:34 -06:00
|
|
|
break;
|
2007-02-09 07:24:38 -07:00
|
|
|
}
|
2007-12-13 07:29:24 -07:00
|
|
|
ignore_option:
|
[DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!
18:38:52.174934 127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526 127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398 127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>
:-)
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:43:56 -07:00
|
|
|
if (opt != DCCPO_MANDATORY)
|
|
|
|
mandatory = 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
2006-03-20 23:06:02 -07:00
|
|
|
/* mandatory was the last byte in option list -> reset connection */
|
|
|
|
if (mandatory)
|
|
|
|
goto out_invalid_option;
|
|
|
|
|
2008-08-23 05:28:27 -06:00
|
|
|
out_nonsensical_length:
|
|
|
|
/* RFC 4340, 5.8: ignore option and all remaining option space */
|
2005-08-09 21:14:34 -06:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
out_invalid_option:
|
|
|
|
DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
|
2008-09-09 05:27:22 -06:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR;
|
|
|
|
DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len);
|
2008-08-23 05:28:27 -06:00
|
|
|
DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2006-03-20 22:25:11 -07:00
|
|
|
EXPORT_SYMBOL_GPL(dccp_parse_options);
|
|
|
|
|
2008-11-23 17:07:53 -07:00
|
|
|
void dccp_encode_value_var(const u64 value, u8 *to, const u8 len)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
2008-11-23 17:07:53 -07:00
|
|
|
if (len >= DCCP_OPTVAL_MAXLEN)
|
|
|
|
*to++ = (value & 0xFF0000000000ull) >> 40;
|
|
|
|
if (len > 4)
|
|
|
|
*to++ = (value & 0xFF00000000ull) >> 32;
|
2005-08-09 21:14:34 -06:00
|
|
|
if (len > 3)
|
|
|
|
*to++ = (value & 0xFF000000) >> 24;
|
|
|
|
if (len > 2)
|
|
|
|
*to++ = (value & 0xFF0000) >> 16;
|
|
|
|
if (len > 1)
|
|
|
|
*to++ = (value & 0xFF00) >> 8;
|
|
|
|
if (len > 0)
|
|
|
|
*to++ = (value & 0xFF);
|
|
|
|
}
|
|
|
|
|
2008-07-13 04:51:40 -06:00
|
|
|
static inline u8 dccp_ndp_len(const u64 ndp)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
2008-07-13 04:51:40 -06:00
|
|
|
if (likely(ndp <= 0xFF))
|
|
|
|
return 1;
|
|
|
|
return likely(ndp <= USHORT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
|
2005-08-09 21:14:34 -06:00
|
|
|
const unsigned char option,
|
|
|
|
const void *value, const unsigned char len)
|
|
|
|
{
|
|
|
|
unsigned char *to;
|
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
|
|
|
|
return -1;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
|
|
|
|
|
|
|
|
to = skb_push(skb, len + 2);
|
|
|
|
*to++ = option;
|
|
|
|
*to++ = len + 2;
|
|
|
|
|
|
|
|
memcpy(to, value, len);
|
2006-03-20 23:32:06 -07:00
|
|
|
return 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(dccp_insert_option);
|
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
|
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
2008-07-13 04:51:40 -06:00
|
|
|
u64 ndp = dp->dccps_ndp_count;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
if (dccp_non_data_packet(skb))
|
|
|
|
++dp->dccps_ndp_count;
|
|
|
|
else
|
|
|
|
dp->dccps_ndp_count = 0;
|
|
|
|
|
|
|
|
if (ndp > 0) {
|
|
|
|
unsigned char *ptr;
|
|
|
|
const int ndp_len = dccp_ndp_len(ndp);
|
|
|
|
const int len = ndp_len + 2;
|
|
|
|
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
|
2006-03-20 23:32:06 -07:00
|
|
|
return -1;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
|
|
|
|
|
|
|
|
ptr = skb_push(skb, len);
|
|
|
|
*ptr++ = DCCPO_NDP_COUNT;
|
|
|
|
*ptr++ = len;
|
|
|
|
dccp_encode_value_var(ndp, ptr, ndp_len);
|
|
|
|
}
|
2006-03-20 23:32:06 -07:00
|
|
|
|
|
|
|
return 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline int dccp_elapsed_time_len(const u32 elapsed_time)
|
|
|
|
{
|
2005-08-18 17:45:29 -06:00
|
|
|
return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb,
|
|
|
|
u32 elapsed_time)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
|
|
|
const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
|
|
|
|
const int len = 2 + elapsed_time_len;
|
|
|
|
unsigned char *to;
|
|
|
|
|
2005-08-19 21:23:43 -06:00
|
|
|
if (elapsed_time_len == 0)
|
2006-03-20 23:32:06 -07:00
|
|
|
return 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
|
|
|
|
return -1;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
|
|
|
|
|
|
|
|
to = skb_push(skb, len);
|
|
|
|
*to++ = DCCPO_ELAPSED_TIME;
|
|
|
|
*to++ = len;
|
|
|
|
|
2005-08-19 21:23:43 -06:00
|
|
|
if (elapsed_time_len == 2) {
|
2006-03-20 20:23:32 -07:00
|
|
|
const __be16 var16 = htons((u16)elapsed_time);
|
2005-08-19 21:23:43 -06:00
|
|
|
memcpy(to, &var16, 2);
|
|
|
|
} else {
|
2006-03-20 20:23:32 -07:00
|
|
|
const __be32 var32 = htonl(elapsed_time);
|
2005-08-19 21:23:43 -06:00
|
|
|
memcpy(to, &var32, 4);
|
|
|
|
}
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
return 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
2005-08-23 22:51:36 -06:00
|
|
|
EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
2007-09-25 23:40:13 -06:00
|
|
|
__be32 now = htonl(dccp_timestamp());
|
2005-08-19 21:23:43 -06:00
|
|
|
/* yes this will overflow but that is the point as we want a
|
|
|
|
* 10 usec 32 bit timer which mean it wraps every 11.9 hours */
|
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
2005-08-23 22:51:36 -06:00
|
|
|
EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
|
|
|
|
|
[DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
* timestamps are recorded on the listening socket;
* Responses are sent from dccp_request_sockets;
* suppose two connections reach the listening socket with very small time in between:
* the first timestamp value gets overwritten by the second connection request.
This is not really good, so this patch separates timestamps into
* those which are received by the server during the initial handshake (on dccp_request_sock);
* those which are received by the client or the client after connection establishment.
As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).
The timestamp-echoing now works as follows:
* when a timestamp is present on the initial Request, it is placed into dreq, due to the
call to dccp_parse_options in dccp_v{4,6}_conn_request;
* when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
from the request_sock into the child cocket in dccp_create_openreq_child;
* timestamps received on an (established) dccp_sock are treated as before.
Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.
Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-13 07:37:19 -07:00
|
|
|
static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
|
|
|
|
struct dccp_request_sock *dreq,
|
2006-03-20 23:32:06 -07:00
|
|
|
struct sk_buff *skb)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
2006-03-20 20:23:32 -07:00
|
|
|
__be32 tstamp_echo;
|
2005-08-09 21:14:34 -06:00
|
|
|
unsigned char *to;
|
[DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
* timestamps are recorded on the listening socket;
* Responses are sent from dccp_request_sockets;
* suppose two connections reach the listening socket with very small time in between:
* the first timestamp value gets overwritten by the second connection request.
This is not really good, so this patch separates timestamps into
* those which are received by the server during the initial handshake (on dccp_request_sock);
* those which are received by the client or the client after connection establishment.
As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).
The timestamp-echoing now works as follows:
* when a timestamp is present on the initial Request, it is placed into dreq, due to the
call to dccp_parse_options in dccp_v{4,6}_conn_request;
* when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
from the request_sock into the child cocket in dccp_create_openreq_child;
* timestamps received on an (established) dccp_sock are treated as before.
Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.
Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-13 07:37:19 -07:00
|
|
|
u32 elapsed_time, elapsed_time_len, len;
|
|
|
|
|
|
|
|
if (dreq != NULL) {
|
|
|
|
elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time;
|
|
|
|
tstamp_echo = htonl(dreq->dreq_timestamp_echo);
|
|
|
|
dreq->dreq_timestamp_echo = 0;
|
|
|
|
} else {
|
|
|
|
elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time;
|
|
|
|
tstamp_echo = htonl(dp->dccps_timestamp_echo);
|
|
|
|
dp->dccps_timestamp_echo = 0;
|
|
|
|
}
|
|
|
|
|
2005-09-08 23:38:35 -06:00
|
|
|
elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
|
|
|
|
len = 6 + elapsed_time_len;
|
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
|
|
|
|
return -1;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
|
|
|
|
|
|
|
|
to = skb_push(skb, len);
|
|
|
|
*to++ = DCCPO_TIMESTAMP_ECHO;
|
|
|
|
*to++ = len;
|
|
|
|
|
|
|
|
memcpy(to, &tstamp_echo, 4);
|
|
|
|
to += 4;
|
[DCCP]: Initial feature negotiation implementation
Still needs more work, but boots and doesn't crashes, even
does some negotiation!
18:38:52.174934 127.0.0.1.43458 > 127.0.0.1.5001: request <change_l ack_ratio 2, change_r ccid 2, change_l ccid 2>
18:38:52.218526 127.0.0.1.5001 > 127.0.0.1.43458: response <nop, nop, change_l ack_ratio 2, confirm_r ccid 2 2, confirm_l ccid 2 2, confirm_r ack_ratio 2>
18:38:52.185398 127.0.0.1.43458 > 127.0.0.1.5001: <nop, confirm_r ack_ratio 2, ack_vector0 0x00, elapsed_time 212>
:-)
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-20 18:43:56 -07:00
|
|
|
|
2005-08-19 21:23:43 -06:00
|
|
|
if (elapsed_time_len == 2) {
|
2006-03-20 20:23:32 -07:00
|
|
|
const __be16 var16 = htons((u16)elapsed_time);
|
2005-08-19 21:23:43 -06:00
|
|
|
memcpy(to, &var16, 2);
|
|
|
|
} else if (elapsed_time_len == 4) {
|
2006-03-20 20:23:32 -07:00
|
|
|
const __be32 var32 = htonl(elapsed_time);
|
2005-08-19 21:23:43 -06:00
|
|
|
memcpy(to, &var32, 4);
|
|
|
|
}
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
return 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
2008-11-23 17:09:11 -07:00
|
|
|
/**
|
|
|
|
* dccp_insert_option_mandatory - Mandatory option (5.8.2)
|
|
|
|
* Note that since we are using skb_push, this function needs to be called
|
|
|
|
* _after_ inserting the option it is supposed to influence (stack order).
|
|
|
|
*/
|
|
|
|
int dccp_insert_option_mandatory(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_opt_len >= DCCP_MAX_OPT_LEN)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len++;
|
|
|
|
*skb_push(skb, 1) = DCCPO_MANDATORY;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-11-23 17:10:23 -07:00
|
|
|
/**
|
|
|
|
* dccp_insert_fn_opt - Insert single Feature-Negotiation option into @skb
|
|
|
|
* @type: %DCCPO_CHANGE_L, %DCCPO_CHANGE_R, %DCCPO_CONFIRM_L, %DCCPO_CONFIRM_R
|
|
|
|
* @feat: one out of %dccp_feature_numbers
|
|
|
|
* @val: NN value or SP array (preferred element first) to copy
|
|
|
|
* @len: true length of @val in bytes (excluding first element repetition)
|
|
|
|
* @repeat_first: whether to copy the first element of @val twice
|
|
|
|
* The last argument is used to construct Confirm options, where the preferred
|
|
|
|
* value and the preference list appear separately (RFC 4340, 6.3.1). Preference
|
|
|
|
* lists are kept such that the preferred entry is always first, so we only need
|
|
|
|
* to copy twice, and avoid the overhead of cloning into a bigger array.
|
|
|
|
*/
|
|
|
|
int dccp_insert_fn_opt(struct sk_buff *skb, u8 type, u8 feat,
|
|
|
|
u8 *val, u8 len, bool repeat_first)
|
2008-09-03 23:30:19 -06:00
|
|
|
{
|
2008-11-23 17:10:23 -07:00
|
|
|
u8 tot_len, *to;
|
2008-09-03 23:30:19 -06:00
|
|
|
|
2008-11-23 17:10:23 -07:00
|
|
|
/* take the `Feature' field and possible repetition into account */
|
|
|
|
if (len > (DCCP_SINGLE_OPT_MAXLEN - 2)) {
|
|
|
|
DCCP_WARN("length %u for feature %u too large\n", len, feat);
|
2008-09-03 23:30:19 -06:00
|
|
|
return -1;
|
2008-09-03 23:30:19 -06:00
|
|
|
}
|
2008-09-03 23:30:19 -06:00
|
|
|
|
2008-11-23 17:10:23 -07:00
|
|
|
if (unlikely(val == NULL || len == 0))
|
|
|
|
len = repeat_first = 0;
|
|
|
|
tot_len = 3 + repeat_first + len;
|
|
|
|
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_opt_len + tot_len > DCCP_MAX_OPT_LEN) {
|
|
|
|
DCCP_WARN("packet too small for feature %d option!\n", feat);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len += tot_len;
|
2008-09-03 23:30:19 -06:00
|
|
|
|
2008-11-23 17:10:23 -07:00
|
|
|
to = skb_push(skb, tot_len);
|
2008-09-09 05:27:22 -06:00
|
|
|
*to++ = type;
|
2008-11-23 17:10:23 -07:00
|
|
|
*to++ = tot_len;
|
2008-09-09 05:27:22 -06:00
|
|
|
*to++ = feat;
|
2008-09-03 23:30:19 -06:00
|
|
|
|
2008-11-23 17:10:23 -07:00
|
|
|
if (repeat_first)
|
|
|
|
*to++ = *val;
|
2008-09-09 05:27:22 -06:00
|
|
|
if (len)
|
|
|
|
memcpy(to, val, len);
|
2008-09-03 23:30:19 -06:00
|
|
|
|
2008-09-09 05:27:22 -06:00
|
|
|
dccp_pr_debug("%s(%s (%d), ...), length %d\n",
|
|
|
|
dccp_feat_typename(type),
|
|
|
|
dccp_feat_name(feat), feat, len);
|
2008-09-03 23:30:19 -06:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-12-13 07:38:11 -07:00
|
|
|
/* The length of all options needs to be a multiple of 4 (5.8) */
|
|
|
|
static void dccp_insert_option_padding(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
int padding = DCCP_SKB_CB(skb)->dccpd_opt_len % 4;
|
|
|
|
|
|
|
|
if (padding != 0) {
|
|
|
|
padding = 4 - padding;
|
|
|
|
memset(skb_push(skb, padding), 0, padding);
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-03-20 23:32:06 -07:00
|
|
|
int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
|
2005-08-09 21:14:34 -06:00
|
|
|
{
|
|
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
2008-09-09 05:27:22 -06:00
|
|
|
struct dccp_minisock *dmsk = dccp_msk(sk);
|
2005-08-09 21:14:34 -06:00
|
|
|
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
|
|
|
|
|
2008-09-09 05:27:22 -06:00
|
|
|
if (dmsk->dccpms_send_ndp_count &&
|
|
|
|
dccp_insert_option_ndp(sk, skb))
|
2006-03-20 23:32:06 -07:00
|
|
|
return -1;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2008-12-02 00:29:30 -07:00
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
|
|
|
|
|
|
|
|
/* Feature Negotiation */
|
|
|
|
if (dccp_feat_insert_opts(dp, NULL, skb))
|
2006-03-20 23:32:06 -07:00
|
|
|
return -1;
|
2008-12-02 00:29:30 -07:00
|
|
|
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
|
|
|
|
/*
|
|
|
|
* Obtain RTT sample from Request/Response exchange.
|
|
|
|
* This is currently used in CCID 3 initialisation.
|
|
|
|
*/
|
|
|
|
if (dccp_insert_option_timestamp(sk, skb))
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
} else if (dmsk->dccpms_send_ack_vector &&
|
|
|
|
dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
|
|
|
|
dccp_insert_option_ackvec(sk, skb)) {
|
|
|
|
return -1;
|
|
|
|
}
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|
|
|
|
|
2005-09-08 23:30:07 -06:00
|
|
|
if (dp->dccps_hc_rx_insert_options) {
|
2006-03-20 23:32:06 -07:00
|
|
|
if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
|
|
|
|
return -1;
|
2005-09-08 23:30:07 -06:00
|
|
|
dp->dccps_hc_rx_insert_options = 0;
|
|
|
|
}
|
2005-08-09 21:14:34 -06:00
|
|
|
|
[DCCP]: Handle timestamps on Request/Response exchange separately
In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response
exchange. This patch addresses the following situation:
* timestamps are recorded on the listening socket;
* Responses are sent from dccp_request_sockets;
* suppose two connections reach the listening socket with very small time in between:
* the first timestamp value gets overwritten by the second connection request.
This is not really good, so this patch separates timestamps into
* those which are received by the server during the initial handshake (on dccp_request_sock);
* those which are received by the client or the client after connection establishment.
As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been
received (in addition, a warning message is printed if hosts send 0-valued timestamps).
The timestamp-echoing now works as follows:
* when a timestamp is present on the initial Request, it is placed into dreq, due to the
call to dccp_parse_options in dccp_v{4,6}_conn_request;
* when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over
from the request_sock into the child cocket in dccp_create_openreq_child;
* timestamps received on an (established) dccp_sock are treated as before.
Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp()
function is used, as it is expected that the time between receiving the timestamp and
sending the timestamp echo will be very small against the wrap-around time. As a byproduct,
this allows smaller timestamping-time fields.
Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with
'!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-13 07:37:19 -07:00
|
|
|
if (dp->dccps_timestamp_echo != 0 &&
|
|
|
|
dccp_insert_option_timestamp_echo(dp, NULL, skb))
|
|
|
|
return -1;
|
|
|
|
|
2007-12-13 07:38:11 -07:00
|
|
|
dccp_insert_option_padding(skb);
|
|
|
|
return 0;
|
|
|
|
}
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2007-12-13 07:38:11 -07:00
|
|
|
int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
|
2008-12-02 00:29:30 -07:00
|
|
|
if (dccp_feat_insert_opts(NULL, dreq, skb))
|
|
|
|
return -1;
|
|
|
|
|
2007-12-13 07:38:11 -07:00
|
|
|
if (dreq->dreq_timestamp_echo != 0 &&
|
|
|
|
dccp_insert_option_timestamp_echo(NULL, dreq, skb))
|
|
|
|
return -1;
|
2006-03-20 23:32:06 -07:00
|
|
|
|
2007-12-13 07:38:11 -07:00
|
|
|
dccp_insert_option_padding(skb);
|
2006-03-20 23:32:06 -07:00
|
|
|
return 0;
|
2005-08-09 21:14:34 -06:00
|
|
|
}
|