![Gerrit Renker](/assets/img/avatar_default.png)
RFC 4340, 7.7 specifies up to 6 bytes for the NDP Count option, whereas the code is currently limited to up to 3 bytes. This seems to be a relict of an earlier draft version and is brought up to date by the patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
618 lines
16 KiB
C
618 lines
16 KiB
C
/*
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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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* 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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* Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
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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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#include <asm/unaligned.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include "ackvec.h"
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#include "ccid.h"
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#include "dccp.h"
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#include "feat.h"
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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_ack_ratio = DCCPF_INITIAL_ACK_RATIO;
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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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static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len)
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{
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u32 value = 0;
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if (len > 3)
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value += *bf++ << 24;
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if (len > 2)
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value += *bf++ << 16;
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if (len > 1)
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value += *bf++ << 8;
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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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/**
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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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{
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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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u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
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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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const unsigned char *opt_end = (unsigned char *)dh +
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(dh->dccph_doff * 4);
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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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unsigned char *value;
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u32 elapsed_time;
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__be32 opt_val;
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int rc;
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int mandatory = 0;
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memset(opt_recv, 0, sizeof(*opt_recv));
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opt = len = 0;
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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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goto out_invalid_option;
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len = *opt_ptr++;
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if (len < 3)
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goto out_invalid_option;
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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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goto out_invalid_option;
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}
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/*
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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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* 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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* The same applies to Ack Vectors, as these depend on the CCID.
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*
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*/
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if (dreq != NULL && (opt >= 128 ||
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opt == DCCPO_ACK_VECTOR_0 || opt == DCCPO_ACK_VECTOR_1))
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goto ignore_option;
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switch (opt) {
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case DCCPO_PADDING:
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break;
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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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if (pkt_type != DCCP_PKT_DATA)
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mandatory = 1;
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break;
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case DCCPO_NDP_COUNT:
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if (len > 6)
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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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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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break;
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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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break;
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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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break;
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case DCCPO_TIMESTAMP:
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if (len != 4)
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goto out_invalid_option;
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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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*/
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opt_val = get_unaligned((__be32 *)value);
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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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}
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if (dreq != NULL) {
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dreq->dreq_timestamp_echo = ntohl(opt_val);
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dreq->dreq_timestamp_time = dccp_timestamp();
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} else {
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opt_recv->dccpor_timestamp =
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dp->dccps_timestamp_echo = ntohl(opt_val);
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dp->dccps_timestamp_time = dccp_timestamp();
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}
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dccp_pr_debug("%s rx opt: TIMESTAMP=%u, ackno=%llu\n",
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dccp_role(sk), ntohl(opt_val),
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(unsigned long long)
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DCCP_SKB_CB(skb)->dccpd_ack_seq);
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break;
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case DCCPO_TIMESTAMP_ECHO:
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if (len != 4 && len != 6 && len != 8)
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goto out_invalid_option;
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opt_val = get_unaligned((__be32 *)value);
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opt_recv->dccpor_timestamp_echo = ntohl(opt_val);
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dccp_pr_debug("%s rx opt: TIMESTAMP_ECHO=%u, len=%d, "
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"ackno=%llu", dccp_role(sk),
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opt_recv->dccpor_timestamp_echo,
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len + 2,
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(unsigned long long)
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DCCP_SKB_CB(skb)->dccpd_ack_seq);
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value += 4;
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if (len == 4) { /* no elapsed time included */
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dccp_pr_debug_cat("\n");
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break;
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}
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if (len == 6) { /* 2-byte elapsed time */
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__be16 opt_val2 = get_unaligned((__be16 *)value);
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elapsed_time = ntohs(opt_val2);
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} else { /* 4-byte elapsed time */
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opt_val = get_unaligned((__be32 *)value);
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elapsed_time = ntohl(opt_val);
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}
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dccp_pr_debug_cat(", ELAPSED_TIME=%u\n", elapsed_time);
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/* Give precedence to the biggest ELAPSED_TIME */
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if (elapsed_time > opt_recv->dccpor_elapsed_time)
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opt_recv->dccpor_elapsed_time = elapsed_time;
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break;
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case DCCPO_ELAPSED_TIME:
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if (dccp_packet_without_ack(skb)) /* RFC 4340, 13.2 */
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break;
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if (len == 2) {
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__be16 opt_val2 = get_unaligned((__be16 *)value);
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elapsed_time = ntohs(opt_val2);
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} else if (len == 4) {
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opt_val = get_unaligned((__be32 *)value);
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elapsed_time = ntohl(opt_val);
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} else {
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goto out_invalid_option;
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}
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if (elapsed_time > opt_recv->dccpor_elapsed_time)
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opt_recv->dccpor_elapsed_time = elapsed_time;
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dccp_pr_debug("%s rx opt: ELAPSED_TIME=%d\n",
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dccp_role(sk), elapsed_time);
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break;
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case 128 ... 191: {
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const u16 idx = value - options;
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if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
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opt, len, idx,
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value) != 0)
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goto out_invalid_option;
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}
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break;
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case 192 ... 255: {
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const u16 idx = value - options;
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if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
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opt, len, idx,
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value) != 0)
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goto out_invalid_option;
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}
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break;
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default:
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DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
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"implemented, ignoring", sk, opt, len);
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break;
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}
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ignore_option:
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if (opt != DCCPO_MANDATORY)
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mandatory = 0;
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}
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/* mandatory was the last byte in option list -> reset connection */
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if (mandatory)
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goto out_invalid_option;
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return 0;
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out_invalid_option:
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DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
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DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR;
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DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len);
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return -1;
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}
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EXPORT_SYMBOL_GPL(dccp_parse_options);
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static void dccp_encode_value_var(const u32 value, unsigned char *to,
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const unsigned int len)
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{
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if (len > 3)
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*to++ = (value & 0xFF000000) >> 24;
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if (len > 2)
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*to++ = (value & 0xFF0000) >> 16;
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if (len > 1)
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*to++ = (value & 0xFF00) >> 8;
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if (len > 0)
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*to++ = (value & 0xFF);
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}
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static inline u8 dccp_ndp_len(const u64 ndp)
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{
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if (likely(ndp <= 0xFF))
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return 1;
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return likely(ndp <= USHORT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
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}
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int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
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const unsigned char option,
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const void *value, const unsigned char len)
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{
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unsigned char *to;
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if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
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return -1;
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DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
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to = skb_push(skb, len + 2);
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*to++ = option;
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*to++ = len + 2;
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memcpy(to, value, len);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_insert_option);
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static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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u64 ndp = dp->dccps_ndp_count;
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if (dccp_non_data_packet(skb))
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++dp->dccps_ndp_count;
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else
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dp->dccps_ndp_count = 0;
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if (ndp > 0) {
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unsigned char *ptr;
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const int ndp_len = dccp_ndp_len(ndp);
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const int len = ndp_len + 2;
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if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
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return -1;
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DCCP_SKB_CB(skb)->dccpd_opt_len += len;
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ptr = skb_push(skb, len);
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*ptr++ = DCCPO_NDP_COUNT;
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*ptr++ = len;
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dccp_encode_value_var(ndp, ptr, ndp_len);
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}
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return 0;
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}
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static inline int dccp_elapsed_time_len(const u32 elapsed_time)
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{
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return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
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}
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int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb,
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u32 elapsed_time)
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{
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const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
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const int len = 2 + elapsed_time_len;
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unsigned char *to;
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if (elapsed_time_len == 0)
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return 0;
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if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
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return -1;
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DCCP_SKB_CB(skb)->dccpd_opt_len += len;
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to = skb_push(skb, len);
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*to++ = DCCPO_ELAPSED_TIME;
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*to++ = len;
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if (elapsed_time_len == 2) {
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const __be16 var16 = htons((u16)elapsed_time);
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memcpy(to, &var16, 2);
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} else {
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const __be32 var32 = htonl(elapsed_time);
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memcpy(to, &var32, 4);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
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int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
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{
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__be32 now = htonl(dccp_timestamp());
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/* yes this will overflow but that is the point as we want a
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* 10 usec 32 bit timer which mean it wraps every 11.9 hours */
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return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
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}
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EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
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static int dccp_insert_option_timestamp_echo(struct dccp_sock *dp,
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struct dccp_request_sock *dreq,
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struct sk_buff *skb)
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{
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__be32 tstamp_echo;
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unsigned char *to;
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u32 elapsed_time, elapsed_time_len, len;
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if (dreq != NULL) {
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elapsed_time = dccp_timestamp() - dreq->dreq_timestamp_time;
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tstamp_echo = htonl(dreq->dreq_timestamp_echo);
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dreq->dreq_timestamp_echo = 0;
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} else {
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elapsed_time = dccp_timestamp() - dp->dccps_timestamp_time;
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tstamp_echo = htonl(dp->dccps_timestamp_echo);
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dp->dccps_timestamp_echo = 0;
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}
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elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
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len = 6 + elapsed_time_len;
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if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
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return -1;
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DCCP_SKB_CB(skb)->dccpd_opt_len += len;
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to = skb_push(skb, len);
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*to++ = DCCPO_TIMESTAMP_ECHO;
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*to++ = len;
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memcpy(to, &tstamp_echo, 4);
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to += 4;
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if (elapsed_time_len == 2) {
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const __be16 var16 = htons((u16)elapsed_time);
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memcpy(to, &var16, 2);
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} else if (elapsed_time_len == 4) {
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const __be32 var32 = htonl(elapsed_time);
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memcpy(to, &var32, 4);
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}
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return 0;
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}
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static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
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u8 *val, u8 len)
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{
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u8 *to;
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if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
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DCCP_WARN("packet too small for feature %d option!\n", feat);
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return -1;
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}
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DCCP_SKB_CB(skb)->dccpd_opt_len += len + 3;
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to = skb_push(skb, len + 3);
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*to++ = type;
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*to++ = len + 3;
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*to++ = feat;
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if (len)
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memcpy(to, val, len);
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dccp_pr_debug("%s(%s (%d), ...), length %d\n",
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dccp_feat_typename(type),
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dccp_feat_name(feat), feat, len);
|
|
return 0;
|
|
}
|
|
|
|
static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct dccp_minisock *dmsk = dccp_msk(sk);
|
|
struct dccp_opt_pend *opt, *next;
|
|
int change = 0;
|
|
|
|
/* confirm any options [NN opts] */
|
|
list_for_each_entry_safe(opt, next, &dmsk->dccpms_conf, dccpop_node) {
|
|
dccp_insert_feat_opt(skb, opt->dccpop_type,
|
|
opt->dccpop_feat, opt->dccpop_val,
|
|
opt->dccpop_len);
|
|
/* fear empty confirms */
|
|
if (opt->dccpop_val)
|
|
kfree(opt->dccpop_val);
|
|
kfree(opt);
|
|
}
|
|
INIT_LIST_HEAD(&dmsk->dccpms_conf);
|
|
|
|
/* see which features we need to send */
|
|
list_for_each_entry(opt, &dmsk->dccpms_pending, dccpop_node) {
|
|
/* see if we need to send any confirm */
|
|
if (opt->dccpop_sc) {
|
|
dccp_insert_feat_opt(skb, opt->dccpop_type + 1,
|
|
opt->dccpop_feat,
|
|
opt->dccpop_sc->dccpoc_val,
|
|
opt->dccpop_sc->dccpoc_len);
|
|
|
|
BUG_ON(!opt->dccpop_sc->dccpoc_val);
|
|
kfree(opt->dccpop_sc->dccpoc_val);
|
|
kfree(opt->dccpop_sc);
|
|
opt->dccpop_sc = NULL;
|
|
}
|
|
|
|
/* any option not confirmed, re-send it */
|
|
if (!opt->dccpop_conf) {
|
|
dccp_insert_feat_opt(skb, opt->dccpop_type,
|
|
opt->dccpop_feat, opt->dccpop_val,
|
|
opt->dccpop_len);
|
|
change++;
|
|
}
|
|
}
|
|
|
|
/* Retransmit timer.
|
|
* If this is the master listening sock, we don't set a timer on it. It
|
|
* should be fine because if the dude doesn't receive our RESPONSE
|
|
* [which will contain the CHANGE] he will send another REQUEST which
|
|
* will "retrnasmit" the change.
|
|
*/
|
|
if (change && dp->dccps_role != DCCP_ROLE_LISTEN) {
|
|
dccp_pr_debug("reset feat negotiation timer %p\n", sk);
|
|
|
|
/* XXX don't reset the timer on re-transmissions. I.e. reset it
|
|
* only when sending new stuff i guess. Currently the timer
|
|
* never backs off because on re-transmission it just resets it!
|
|
*/
|
|
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
|
|
inet_csk(sk)->icsk_rto, DCCP_RTO_MAX);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dccp_sock *dp = dccp_sk(sk);
|
|
struct dccp_minisock *dmsk = dccp_msk(sk);
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
|
|
|
|
if (dmsk->dccpms_send_ndp_count &&
|
|
dccp_insert_option_ndp(sk, skb))
|
|
return -1;
|
|
|
|
if (!dccp_packet_without_ack(skb)) {
|
|
if (dmsk->dccpms_send_ack_vector &&
|
|
dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
|
|
dccp_insert_option_ackvec(sk, skb))
|
|
return -1;
|
|
}
|
|
|
|
if (dp->dccps_hc_rx_insert_options) {
|
|
if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
|
|
return -1;
|
|
dp->dccps_hc_rx_insert_options = 0;
|
|
}
|
|
|
|
/* Feature negotiation */
|
|
/* Data packets can't do feat negotiation */
|
|
if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
|
|
DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
|
|
dccp_insert_options_feat(sk, skb))
|
|
return -1;
|
|
|
|
/*
|
|
* Obtain RTT sample from Request/Response exchange.
|
|
* This is currently used in CCID 3 initialisation.
|
|
*/
|
|
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&
|
|
dccp_insert_option_timestamp(sk, skb))
|
|
return -1;
|
|
|
|
if (dp->dccps_timestamp_echo != 0 &&
|
|
dccp_insert_option_timestamp_echo(dp, NULL, skb))
|
|
return -1;
|
|
|
|
dccp_insert_option_padding(skb);
|
|
return 0;
|
|
}
|
|
|
|
int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
|
|
{
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
|
|
|
|
if (dreq->dreq_timestamp_echo != 0 &&
|
|
dccp_insert_option_timestamp_echo(NULL, dreq, skb))
|
|
return -1;
|
|
|
|
dccp_insert_option_padding(skb);
|
|
return 0;
|
|
}
|