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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
609 lines
16 KiB
C
609 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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* 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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#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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u64 dccp_decode_value_var(const u8 *bf, const u8 len)
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{
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u64 value = 0;
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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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if (len > 3)
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value += ((u64)*bf++) << 24;
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if (len > 2)
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value += ((u64)*bf++) << 16;
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if (len > 1)
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value += ((u64)*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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* @skb: frame to parse
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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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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_nonsensical_length;
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len = *opt_ptr++;
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if (len < 2)
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goto out_nonsensical_length;
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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_nonsensical_length;
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}
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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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if (dreq != NULL && (opt >= DCCPO_MIN_RX_CCID_SPECIFIC ||
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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 ... DCCPO_CONFIRM_R:
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if (pkt_type == DCCP_PKT_DATA) /* RFC 4340, 6 */
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break;
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if (len == 0)
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goto out_invalid_option;
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rc = dccp_feat_parse_options(sk, dreq, mandatory, opt,
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*value, value + 1, len - 1);
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if (rc)
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goto out_featneg_failed;
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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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/* schedule an Ack in case this sender is quiescent */
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inet_csk_schedule_ack(sk);
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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 DCCPO_MIN_RX_CCID_SPECIFIC ... DCCPO_MAX_RX_CCID_SPECIFIC:
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if (ccid_hc_rx_parse_options(dp->dccps_hc_rx_ccid, sk,
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pkt_type, opt, value, len))
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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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/*
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* Ack vectors are processed by the TX CCID if it is
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* interested. The RX CCID need not parse Ack Vectors,
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* since it is only interested in clearing old state.
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*/
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fallthrough;
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case DCCPO_MIN_TX_CCID_SPECIFIC ... DCCPO_MAX_TX_CCID_SPECIFIC:
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if (ccid_hc_tx_parse_options(dp->dccps_hc_tx_ccid, sk,
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pkt_type, opt, value, len))
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goto out_invalid_option;
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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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out_nonsensical_length:
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/* RFC 4340, 5.8: ignore option and all remaining option space */
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return 0;
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out_invalid_option:
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DCCP_INC_STATS(DCCP_MIB_INVALIDOPT);
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rc = DCCP_RESET_CODE_OPTION_ERROR;
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out_featneg_failed:
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DCCP_WARN("DCCP(%p): Option %d (len=%d) error=%u\n", sk, opt, len, rc);
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DCCP_SKB_CB(skb)->dccpd_reset_code = rc;
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DCCP_SKB_CB(skb)->dccpd_reset_data[0] = opt;
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DCCP_SKB_CB(skb)->dccpd_reset_data[1] = len > 0 ? value[0] : 0;
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DCCP_SKB_CB(skb)->dccpd_reset_data[2] = len > 1 ? value[1] : 0;
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return -1;
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}
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EXPORT_SYMBOL_GPL(dccp_parse_options);
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void dccp_encode_value_var(const u64 value, u8 *to, const u8 len)
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{
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if (len >= DCCP_OPTVAL_MAXLEN)
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*to++ = (value & 0xFF0000000000ull) >> 40;
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if (len > 4)
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*to++ = (value & 0xFF00000000ull) >> 32;
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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 <= USHRT_MAX) ? 2 : (ndp <= UINT_MAX ? 4 : 6);
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}
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int dccp_insert_option(struct sk_buff *skb, 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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static int dccp_insert_option_timestamp(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(skb, DCCPO_TIMESTAMP, &now, sizeof(now));
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}
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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_option_ackvec(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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struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
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struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
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const u16 buflen = dccp_ackvec_buflen(av);
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/* Figure out how many options do we need to represent the ackvec */
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const u8 nr_opts = DIV_ROUND_UP(buflen, DCCP_SINGLE_OPT_MAXLEN);
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u16 len = buflen + 2 * nr_opts;
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u8 i, nonce = 0;
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const unsigned char *tail, *from;
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unsigned char *to;
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if (dcb->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
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DCCP_WARN("Lacking space for %u bytes on %s packet\n", len,
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dccp_packet_name(dcb->dccpd_type));
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return -1;
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}
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/*
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* Since Ack Vectors are variable-length, we can not always predict
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* their size. To catch exception cases where the space is running out
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* on the skb, a separate Sync is scheduled to carry the Ack Vector.
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*/
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if (len > DCCPAV_MIN_OPTLEN &&
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len + dcb->dccpd_opt_len + skb->len > dp->dccps_mss_cache) {
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DCCP_WARN("No space left for Ack Vector (%u) on skb (%u+%u), "
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"MPS=%u ==> reduce payload size?\n", len, skb->len,
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dcb->dccpd_opt_len, dp->dccps_mss_cache);
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dp->dccps_sync_scheduled = 1;
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return 0;
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}
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dcb->dccpd_opt_len += len;
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to = skb_push(skb, len);
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len = buflen;
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from = av->av_buf + av->av_buf_head;
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tail = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
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for (i = 0; i < nr_opts; ++i) {
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int copylen = len;
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if (len > DCCP_SINGLE_OPT_MAXLEN)
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copylen = DCCP_SINGLE_OPT_MAXLEN;
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/*
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* RFC 4340, 12.2: Encode the Nonce Echo for this Ack Vector via
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* its type; ack_nonce is the sum of all individual buf_nonce's.
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*/
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nonce ^= av->av_buf_nonce[i];
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*to++ = DCCPO_ACK_VECTOR_0 + av->av_buf_nonce[i];
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*to++ = copylen + 2;
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/* Check if buf_head wraps */
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if (from + copylen > tail) {
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const u16 tailsize = tail - from;
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memcpy(to, from, tailsize);
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to += tailsize;
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len -= tailsize;
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copylen -= tailsize;
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from = av->av_buf;
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}
|
|
|
|
memcpy(to, from, copylen);
|
|
from += copylen;
|
|
to += copylen;
|
|
len -= copylen;
|
|
}
|
|
/*
|
|
* Each sent Ack Vector is recorded in the list, as per A.2 of RFC 4340.
|
|
*/
|
|
if (dccp_ackvec_update_records(av, dcb->dccpd_seq, nonce))
|
|
return -ENOBUFS;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dccp_insert_option_mandatory - Mandatory option (5.8.2)
|
|
* @skb: frame into which to insert option
|
|
*
|
|
* 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++;
|
|
*(u8 *)skb_push(skb, 1) = DCCPO_MANDATORY;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dccp_insert_fn_opt - Insert single Feature-Negotiation option into @skb
|
|
* @skb: frame to insert feature negotiation option into
|
|
* @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)
|
|
{
|
|
u8 tot_len, *to;
|
|
|
|
/* 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);
|
|
return -1;
|
|
}
|
|
|
|
if (unlikely(val == NULL || len == 0))
|
|
len = repeat_first = false;
|
|
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;
|
|
|
|
to = skb_push(skb, tot_len);
|
|
*to++ = type;
|
|
*to++ = tot_len;
|
|
*to++ = feat;
|
|
|
|
if (repeat_first)
|
|
*to++ = *val;
|
|
if (len)
|
|
memcpy(to, val, len);
|
|
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);
|
|
|
|
DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
|
|
|
|
if (dp->dccps_send_ndp_count && dccp_insert_option_ndp(sk, skb))
|
|
return -1;
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
|
|
|
|
/* Feature Negotiation */
|
|
if (dccp_feat_insert_opts(dp, NULL, skb))
|
|
return -1;
|
|
|
|
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
|
|
/*
|
|
* Obtain RTT sample from Request/Response exchange.
|
|
* This is currently used for TFRC initialisation.
|
|
*/
|
|
if (dccp_insert_option_timestamp(skb))
|
|
return -1;
|
|
|
|
} else if (dccp_ackvec_pending(sk) &&
|
|
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;
|
|
}
|
|
|
|
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 (dccp_feat_insert_opts(NULL, dreq, skb))
|
|
return -1;
|
|
|
|
/* Obtain RTT sample from Response/Ack exchange (used by TFRC). */
|
|
if (dccp_insert_option_timestamp(skb))
|
|
return -1;
|
|
|
|
if (dreq->dreq_timestamp_echo != 0 &&
|
|
dccp_insert_option_timestamp_echo(NULL, dreq, skb))
|
|
return -1;
|
|
|
|
dccp_insert_option_padding(skb);
|
|
return 0;
|
|
}
|