options.c (648ef4b88673dadb8463bf0d4b10fbf33d55def8) options.c (65492c5a6ab5df5091a77562dbcca2d2dc3877c0)
1// SPDX-License-Identifier: GPL-2.0
2/* Multipath TCP
3 *
4 * Copyright (c) 2017 - 2019, Intel Corporation.
5 */
6
7#include <linux/kernel.h>
8#include <net/tcp.h>
9#include <net/mptcp.h>
10#include "protocol.h"
11
1// SPDX-License-Identifier: GPL-2.0
2/* Multipath TCP
3 *
4 * Copyright (c) 2017 - 2019, Intel Corporation.
5 */
6
7#include <linux/kernel.h>
8#include <net/tcp.h>
9#include <net/mptcp.h>
10#include "protocol.h"
11
12static bool mptcp_cap_flag_sha256(u8 flags)
13{
14 return (flags & MPTCP_CAP_FLAG_MASK) == MPTCP_CAP_HMAC_SHA256;
15}
16
12void mptcp_parse_option(const unsigned char *ptr, int opsize,
13 struct tcp_options_received *opt_rx)
14{
15 struct mptcp_options_received *mp_opt = &opt_rx->mptcp;
16 u8 subtype = *ptr >> 4;
17 int expected_opsize;
18 u8 version;
19 u8 flags;

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24 opsize != TCPOLEN_MPTCP_MPC_ACK)
25 break;
26
27 version = *ptr++ & MPTCP_VERSION_MASK;
28 if (version != MPTCP_SUPPORTED_VERSION)
29 break;
30
31 flags = *ptr++;
17void mptcp_parse_option(const unsigned char *ptr, int opsize,
18 struct tcp_options_received *opt_rx)
19{
20 struct mptcp_options_received *mp_opt = &opt_rx->mptcp;
21 u8 subtype = *ptr >> 4;
22 int expected_opsize;
23 u8 version;
24 u8 flags;

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29 opsize != TCPOLEN_MPTCP_MPC_ACK)
30 break;
31
32 version = *ptr++ & MPTCP_VERSION_MASK;
33 if (version != MPTCP_SUPPORTED_VERSION)
34 break;
35
36 flags = *ptr++;
32 if (!((flags & MPTCP_CAP_FLAG_MASK) == MPTCP_CAP_HMAC_SHA1) ||
37 if (!mptcp_cap_flag_sha256(flags) ||
33 (flags & MPTCP_CAP_EXTENSIBILITY))
34 break;
35
36 /* RFC 6824, Section 3.1:
37 * "For the Checksum Required bit (labeled "A"), if either
38 * host requires the use of checksums, checksums MUST be used.
39 * In other words, the only way for checksums not to be used
40 * is if both hosts in their SYNs set A=0."

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394 else if (OPTION_MPTCP_MPC_SYNACK & opts->suboptions)
395 len = TCPOLEN_MPTCP_MPC_SYNACK;
396 else
397 len = TCPOLEN_MPTCP_MPC_ACK;
398
399 *ptr++ = htonl((TCPOPT_MPTCP << 24) | (len << 16) |
400 (MPTCPOPT_MP_CAPABLE << 12) |
401 (MPTCP_SUPPORTED_VERSION << 8) |
38 (flags & MPTCP_CAP_EXTENSIBILITY))
39 break;
40
41 /* RFC 6824, Section 3.1:
42 * "For the Checksum Required bit (labeled "A"), if either
43 * host requires the use of checksums, checksums MUST be used.
44 * In other words, the only way for checksums not to be used
45 * is if both hosts in their SYNs set A=0."

--- 353 unchanged lines hidden (view full) ---

399 else if (OPTION_MPTCP_MPC_SYNACK & opts->suboptions)
400 len = TCPOLEN_MPTCP_MPC_SYNACK;
401 else
402 len = TCPOLEN_MPTCP_MPC_ACK;
403
404 *ptr++ = htonl((TCPOPT_MPTCP << 24) | (len << 16) |
405 (MPTCPOPT_MP_CAPABLE << 12) |
406 (MPTCP_SUPPORTED_VERSION << 8) |
402 MPTCP_CAP_HMAC_SHA1);
407 MPTCP_CAP_HMAC_SHA256);
403 put_unaligned_be64(opts->sndr_key, ptr);
404 ptr += 2;
405 if (OPTION_MPTCP_MPC_ACK & opts->suboptions) {
406 put_unaligned_be64(opts->rcvr_key, ptr);
407 ptr += 2;
408 }
409 }
410

--- 41 unchanged lines hidden --- 		408 put_unaligned_be64(opts->sndr_key, ptr);
409 ptr += 2;
410 if (OPTION_MPTCP_MPC_ACK & opts->suboptions) {
411 put_unaligned_be64(opts->rcvr_key, ptr);
412 ptr += 2;
413 }
414 }
415

--- 41 unchanged lines hidden ---