blob: 67a61ac48b20a92d3ea7b27b818164e935e0d041 [file] [log] [blame]
Mat Martineauf870fa02020-01-21 16:56:15 -08001/* SPDX-License-Identifier: GPL-2.0 */
2/* Multipath TCP
3 *
4 * Copyright (c) 2017 - 2019, Intel Corporation.
5 */
6
7#ifndef __MPTCP_PROTOCOL_H
8#define __MPTCP_PROTOCOL_H
9
Peter Krystad79c09492020-01-21 16:56:20 -080010#include <linux/random.h>
11#include <net/tcp.h>
12#include <net/inet_connection_sock.h>
Florian Westphalb911c972021-02-12 16:00:01 -080013#include <uapi/linux/mptcp.h>
Peter Krystad79c09492020-01-21 16:56:20 -080014
Christoph Paaschcc7972e2020-01-21 16:56:31 -080015#define MPTCP_SUPPORTED_VERSION 1
Peter Krystadeda7acd2020-01-21 16:56:16 -080016
17/* MPTCP option bits */
18#define OPTION_MPTCP_MPC_SYN BIT(0)
19#define OPTION_MPTCP_MPC_SYNACK BIT(1)
20#define OPTION_MPTCP_MPC_ACK BIT(2)
Peter Krystadf2962342020-03-27 14:48:39 -070021#define OPTION_MPTCP_MPJ_SYN BIT(3)
22#define OPTION_MPTCP_MPJ_SYNACK BIT(4)
23#define OPTION_MPTCP_MPJ_ACK BIT(5)
Peter Krystad3df523a2020-03-27 14:48:37 -070024#define OPTION_MPTCP_ADD_ADDR BIT(6)
Geliang Tangfef6b7e2021-04-06 17:15:59 -070025#define OPTION_MPTCP_RM_ADDR BIT(7)
26#define OPTION_MPTCP_FASTCLOSE BIT(8)
27#define OPTION_MPTCP_PRIO BIT(9)
28#define OPTION_MPTCP_RST BIT(10)
Paolo Abeni1bff1e42021-08-24 16:26:13 -070029#define OPTION_MPTCP_DSS BIT(11)
Geliang Tangc25aeb42021-08-24 16:26:15 -070030#define OPTION_MPTCP_FAIL BIT(12)
Peter Krystadeda7acd2020-01-21 16:56:16 -080031
Paolo Abeni74c7dfb2021-08-26 17:44:52 -070032#define OPTION_MPTCP_CSUMREQD BIT(13)
33
34#define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \
35 OPTION_MPTCP_MPC_ACK)
36#define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \
Wan Jiabing780aa122021-09-01 11:19:32 +080037 OPTION_MPTCP_MPJ_ACK)
Paolo Abeni74c7dfb2021-08-26 17:44:52 -070038
Peter Krystadeda7acd2020-01-21 16:56:16 -080039/* MPTCP option subtypes */
40#define MPTCPOPT_MP_CAPABLE 0
41#define MPTCPOPT_MP_JOIN 1
42#define MPTCPOPT_DSS 2
43#define MPTCPOPT_ADD_ADDR 3
44#define MPTCPOPT_RM_ADDR 4
45#define MPTCPOPT_MP_PRIO 5
46#define MPTCPOPT_MP_FAIL 6
47#define MPTCPOPT_MP_FASTCLOSE 7
Florian Westphaldc87efd2021-04-01 16:19:44 -070048#define MPTCPOPT_RST 8
Peter Krystadeda7acd2020-01-21 16:56:16 -080049
50/* MPTCP suboption lengths */
Christoph Paaschcc7972e2020-01-21 16:56:31 -080051#define TCPOLEN_MPTCP_MPC_SYN 4
Peter Krystadeda7acd2020-01-21 16:56:16 -080052#define TCPOLEN_MPTCP_MPC_SYNACK 12
53#define TCPOLEN_MPTCP_MPC_ACK 20
Christoph Paaschcc7972e2020-01-21 16:56:31 -080054#define TCPOLEN_MPTCP_MPC_ACK_DATA 22
Peter Krystadf2962342020-03-27 14:48:39 -070055#define TCPOLEN_MPTCP_MPJ_SYN 12
56#define TCPOLEN_MPTCP_MPJ_SYNACK 16
57#define TCPOLEN_MPTCP_MPJ_ACK 24
Mat Martineau6d0060f2020-01-21 16:56:23 -080058#define TCPOLEN_MPTCP_DSS_BASE 4
Mat Martineau648ef4b2020-01-21 16:56:24 -080059#define TCPOLEN_MPTCP_DSS_ACK32 4
Mat Martineau6d0060f2020-01-21 16:56:23 -080060#define TCPOLEN_MPTCP_DSS_ACK64 8
Mat Martineau648ef4b2020-01-21 16:56:24 -080061#define TCPOLEN_MPTCP_DSS_MAP32 10
Mat Martineau6d0060f2020-01-21 16:56:23 -080062#define TCPOLEN_MPTCP_DSS_MAP64 14
63#define TCPOLEN_MPTCP_DSS_CHECKSUM 2
Peter Krystad3df523a2020-03-27 14:48:37 -070064#define TCPOLEN_MPTCP_ADD_ADDR 16
Davide Caratti27ab92d2021-03-08 10:00:04 +010065#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
Peter Krystad3df523a2020-03-27 14:48:37 -070066#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
Davide Caratti27ab92d2021-03-08 10:00:04 +010067#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
Peter Krystad3df523a2020-03-27 14:48:37 -070068#define TCPOLEN_MPTCP_ADD_ADDR6 28
Davide Caratti27ab92d2021-03-08 10:00:04 +010069#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
Peter Krystad3df523a2020-03-27 14:48:37 -070070#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
Davide Caratti27ab92d2021-03-08 10:00:04 +010071#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
72#define TCPOLEN_MPTCP_PORT_LEN 2
73#define TCPOLEN_MPTCP_PORT_ALIGN 2
Geliang Tang6445e172021-03-12 17:16:11 -080074#define TCPOLEN_MPTCP_RM_ADDR_BASE 3
Davide Carattiec99a472021-02-01 14:05:26 +010075#define TCPOLEN_MPTCP_PRIO 3
76#define TCPOLEN_MPTCP_PRIO_ALIGN 4
Florian Westphal50c504a2020-12-10 14:25:04 -080077#define TCPOLEN_MPTCP_FASTCLOSE 12
Florian Westphaldc87efd2021-04-01 16:19:44 -070078#define TCPOLEN_MPTCP_RST 4
Geliang Tangc25aeb42021-08-24 16:26:15 -070079#define TCPOLEN_MPTCP_FAIL 12
Peter Krystadeda7acd2020-01-21 16:56:16 -080080
Geliang Tang208e8f62021-06-17 16:46:14 -070081#define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
82
Peter Krystadec3edaa2020-03-27 14:48:40 -070083/* MPTCP MP_JOIN flags */
Peter Krystadf2962342020-03-27 14:48:39 -070084#define MPTCPOPT_BACKUP BIT(0)
85#define MPTCPOPT_HMAC_LEN 20
Peter Krystadec3edaa2020-03-27 14:48:40 -070086#define MPTCPOPT_THMAC_LEN 8
Peter Krystadf2962342020-03-27 14:48:39 -070087
Peter Krystadeda7acd2020-01-21 16:56:16 -080088/* MPTCP MP_CAPABLE flags */
89#define MPTCP_VERSION_MASK (0x0F)
90#define MPTCP_CAP_CHECKSUM_REQD BIT(7)
91#define MPTCP_CAP_EXTENSIBILITY BIT(6)
Geliang Tangbab6b882021-06-22 12:25:19 -070092#define MPTCP_CAP_DENY_JOIN_ID0 BIT(5)
Paolo Abeni65492c52020-01-21 16:56:30 -080093#define MPTCP_CAP_HMAC_SHA256 BIT(0)
Geliang Tangbab6b882021-06-22 12:25:19 -070094#define MPTCP_CAP_FLAG_MASK (0x1F)
Peter Krystadeda7acd2020-01-21 16:56:16 -080095
Mat Martineau6d0060f2020-01-21 16:56:23 -080096/* MPTCP DSS flags */
97#define MPTCP_DSS_DATA_FIN BIT(4)
98#define MPTCP_DSS_DSN64 BIT(3)
99#define MPTCP_DSS_HAS_MAP BIT(2)
100#define MPTCP_DSS_ACK64 BIT(1)
101#define MPTCP_DSS_HAS_ACK BIT(0)
Mat Martineau648ef4b2020-01-21 16:56:24 -0800102#define MPTCP_DSS_FLAG_MASK (0x1F)
103
Peter Krystad3df523a2020-03-27 14:48:37 -0700104/* MPTCP ADD_ADDR flags */
105#define MPTCP_ADDR_ECHO BIT(0)
Peter Krystad3df523a2020-03-27 14:48:37 -0700106
Geliang Tang40453a52021-01-08 16:47:58 -0800107/* MPTCP MP_PRIO flags */
108#define MPTCP_PRIO_BKUP BIT(0)
109
Florian Westphaldc87efd2021-04-01 16:19:44 -0700110/* MPTCP TCPRST flags */
111#define MPTCP_RST_TRANSIENT BIT(0)
112
Mat Martineau648ef4b2020-01-21 16:56:24 -0800113/* MPTCP socket flags */
Florian Westphald99bfed2020-02-17 16:54:38 +0100114#define MPTCP_DATA_READY 0
Florian Westphal8edf0862020-11-16 10:48:12 +0100115#define MPTCP_NOSPACE 1
Paolo Abeni3b1d6212020-03-27 14:48:48 -0700116#define MPTCP_WORK_RTX 2
Florian Westphal59832e22020-04-02 13:44:52 +0200117#define MPTCP_WORK_EOF 3
Davide Carattie1ff9e82020-06-29 22:26:20 +0200118#define MPTCP_FALLBACK_DONE 4
Paolo Abeni0e4f35d2020-10-09 19:00:01 +0200119#define MPTCP_WORK_CLOSE_SUBFLOW 5
Paolo Abeni6e628cd2020-11-27 11:10:27 +0100120#define MPTCP_PUSH_PENDING 6
121#define MPTCP_CLEAN_UNA 7
Paolo Abeni15cc1042021-02-11 15:30:37 -0800122#define MPTCP_ERROR_REPORT 8
Paolo Abeni2d6f5a22021-03-26 11:26:30 -0700123#define MPTCP_RETRANSMIT 9
Florian Westphal78962482021-04-15 16:44:53 -0700124#define MPTCP_WORK_SYNC_SETSOCKOPT 10
Paolo Abeni490274b2021-06-21 17:33:08 -0700125#define MPTCP_CONNECTED 11
Mat Martineau6d0060f2020-01-21 16:56:23 -0800126
Paolo Abenieaa2ffa2020-11-16 10:48:08 +0100127static inline bool before64(__u64 seq1, __u64 seq2)
128{
129 return (__s64)(seq1 - seq2) < 0;
130}
131
132#define after64(seq2, seq1) before64(seq1, seq2)
133
Paolo Abenicfde1412020-04-30 15:01:52 +0200134struct mptcp_options_received {
135 u64 sndr_key;
136 u64 rcvr_key;
137 u64 data_ack;
138 u64 data_seq;
139 u32 subflow_seq;
140 u16 data_len;
Geliang Tang208e8f62021-06-17 16:46:14 -0700141 __sum16 csum;
Paolo Abeni74c7dfb2021-08-26 17:44:52 -0700142 u16 suboptions;
Paolo Abenicfde1412020-04-30 15:01:52 +0200143 u32 token;
144 u32 nonce;
Paolo Abenia086aeb2021-08-26 17:44:51 -0700145 u16 use_map:1,
Paolo Abenicfde1412020-04-30 15:01:52 +0200146 dsn64:1,
147 data_fin:1,
148 use_ack:1,
149 ack64:1,
150 mpc_map:1,
Paolo Abenia086aeb2021-08-26 17:44:51 -0700151 reset_reason:4,
152 reset_transient:1,
153 echo:1,
154 backup:1,
155 deny_join_id0:1,
Paolo Abenicfde1412020-04-30 15:01:52 +0200156 __unused:2;
Paolo Abenia086aeb2021-08-26 17:44:51 -0700157 u8 join_id;
158 u64 thmac;
159 u8 hmac[MPTCPOPT_HMAC_LEN];
Geliang Tangf7dafee2021-04-06 17:16:00 -0700160 struct mptcp_addr_info addr;
Geliang Tang5c4a8242021-03-12 17:16:13 -0800161 struct mptcp_rm_list rm_list;
Paolo Abenicfde1412020-04-30 15:01:52 +0200162 u64 ahmac;
Geliang Tang5580d412021-08-24 16:26:16 -0700163 u64 fail_seq;
Paolo Abenicfde1412020-04-30 15:01:52 +0200164};
165
Peter Krystad3df523a2020-03-27 14:48:37 -0700166static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
167{
168 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
169 ((nib & 0xF) << 8) | field);
170}
171
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700172enum mptcp_pm_status {
173 MPTCP_PM_ADD_ADDR_RECEIVED,
Geliang Tang84dfe362020-11-19 11:46:00 -0800174 MPTCP_PM_ADD_ADDR_SEND_ACK,
Geliang Tangd0876b22020-09-24 08:29:49 +0800175 MPTCP_PM_RM_ADDR_RECEIVED,
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700176 MPTCP_PM_ESTABLISHED,
Paolo Abeni5b950ff2020-12-09 12:03:29 +0100177 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700178 MPTCP_PM_SUBFLOW_ESTABLISHED,
179};
180
Geliang Tang13ad9f02020-12-09 15:51:27 -0800181enum mptcp_addr_signal_status {
Geliang Tangd91d3222020-11-19 11:45:59 -0800182 MPTCP_ADD_ADDR_SIGNAL,
183 MPTCP_ADD_ADDR_ECHO,
Geliang Tang42842a42020-12-09 15:51:26 -0800184 MPTCP_RM_ADDR_SIGNAL,
Geliang Tangd91d3222020-11-19 11:45:59 -0800185};
186
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700187struct mptcp_pm_data {
188 struct mptcp_addr_info local;
189 struct mptcp_addr_info remote;
Geliang Tangb6c08382020-09-24 08:29:54 +0800190 struct list_head anno_list;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700191
192 spinlock_t lock; /*protects the whole PM data */
193
Geliang Tang13ad9f02020-12-09 15:51:27 -0800194 u8 addr_signal;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700195 bool server_side;
196 bool work_pending;
197 bool accept_addr;
198 bool accept_subflow;
Geliang Tangdf377be2021-06-22 12:25:20 -0700199 bool remote_deny_join_id0;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700200 u8 add_addr_signaled;
201 u8 add_addr_accepted;
202 u8 local_addr_used;
203 u8 subflows;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700204 u8 status;
Geliang Tangcbde2782021-03-12 17:16:12 -0800205 struct mptcp_rm_list rm_list_tx;
Geliang Tangb5c55f32021-03-12 17:16:14 -0800206 struct mptcp_rm_list rm_list_rx;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700207};
208
Paolo Abeni18b683b2020-03-27 14:48:43 -0700209struct mptcp_data_frag {
210 struct list_head list;
211 u64 data_seq;
Paolo Abenif0e6a4c2020-11-16 10:48:07 +0100212 u16 data_len;
213 u16 offset;
214 u16 overhead;
215 u16 already_sent;
Paolo Abeni18b683b2020-03-27 14:48:43 -0700216 struct page *page;
217};
218
Mat Martineauf870fa02020-01-21 16:56:15 -0800219/* MPTCP connection sock */
220struct mptcp_sock {
221 /* inet_connection_sock must be the first member */
222 struct inet_connection_sock sk;
Peter Krystadcec37a62020-01-21 16:56:18 -0800223 u64 local_key;
224 u64 remote_key;
Mat Martineau6d0060f2020-01-21 16:56:23 -0800225 u64 write_seq;
Paolo Abenieaa2ffa2020-11-16 10:48:08 +0100226 u64 snd_nxt;
Mat Martineau6d0060f2020-01-21 16:56:23 -0800227 u64 ack_seq;
Florian Westphalfa3fe2b2020-11-19 11:46:02 -0800228 u64 rcv_wnd_sent;
Mat Martineau3721b9b2020-07-28 15:12:03 -0700229 u64 rcv_data_fin_seq;
Paolo Abeni65118822021-10-26 16:29:15 -0700230 int rmem_fwd_alloc;
Paolo Abenid5f49192020-09-14 10:01:17 +0200231 struct sock *last_snd;
232 int snd_burst;
Paolo Abeniea4ca582020-11-19 11:46:03 -0800233 int old_wspace;
Paolo Abeni1e1d9d62021-08-13 15:15:43 -0700234 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq;
235 * recovery related fields are under data_lock
236 * protection
237 */
Paolo Abeni7439d682020-11-27 11:10:26 +0100238 u64 snd_una;
239 u64 wnd_end;
Paolo Abenib51f9b82020-03-27 14:48:44 -0700240 unsigned long timer_ival;
Peter Krystad79c09492020-01-21 16:56:20 -0800241 u32 token;
Paolo Abeni87952602020-11-27 11:10:24 +0100242 int rmem_released;
Mat Martineau648ef4b2020-01-21 16:56:24 -0800243 unsigned long flags;
Paolo Abeni1e1d9d62021-08-13 15:15:43 -0700244 bool recovery; /* closing subflow write queue reinjected */
Christoph Paaschd22f4982020-01-21 16:56:32 -0800245 bool can_ack;
Paolo Abenib93df082020-07-23 13:02:32 +0200246 bool fully_established;
Mat Martineau3721b9b2020-07-28 15:12:03 -0700247 bool rcv_data_fin;
Mat Martineau7279da62020-07-28 15:12:02 -0700248 bool snd_data_fin_enable;
Florian Westphal50c504a2020-12-10 14:25:04 -0800249 bool rcv_fastclose;
Davide Caratti37198e92020-10-06 18:26:17 +0200250 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
Geliang Tang752e9062021-06-17 16:46:07 -0700251 bool csum_enabled;
Peter Krystadec3edaa2020-03-27 14:48:40 -0700252 spinlock_t join_list_lock;
Paolo Abeni80992012020-02-26 10:14:47 +0100253 struct work_struct work;
Paolo Abeniab174ad2020-09-14 10:01:12 +0200254 struct sk_buff *ooo_last_skb;
255 struct rb_root out_of_order_queue;
Paolo Abeni87952602020-11-27 11:10:24 +0100256 struct sk_buff_head receive_queue;
Peter Krystadcec37a62020-01-21 16:56:18 -0800257 struct list_head conn_list;
Paolo Abeni18b683b2020-03-27 14:48:43 -0700258 struct list_head rtx_queue;
Paolo Abenif0e6a4c2020-11-16 10:48:07 +0100259 struct mptcp_data_frag *first_pending;
Peter Krystadec3edaa2020-03-27 14:48:40 -0700260 struct list_head join_list;
Mat Martineauf870fa02020-01-21 16:56:15 -0800261 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
Paolo Abeni8ab183d2020-01-21 16:56:33 -0800262 struct sock *first;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700263 struct mptcp_pm_data pm;
Florian Westphala6b118f2020-06-30 21:24:45 +0200264 struct {
265 u32 space; /* bytes copied in last measurement window */
266 u32 copied; /* bytes copied in this measurement window */
267 u64 time; /* start time of measurement window */
268 u64 rtt_us; /* last maximum rtt of subflows */
269 } rcvq_space;
Florian Westphaldf00b082021-04-15 16:44:54 -0700270
271 u32 setsockopt_seq;
Paolo Abeni20b57592021-05-25 14:23:10 -0700272 char ca_name[TCP_CA_NAME_MAX];
Mat Martineauf870fa02020-01-21 16:56:15 -0800273};
274
Paolo Abeni87952602020-11-27 11:10:24 +0100275#define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
276#define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
277
Peter Krystadcec37a62020-01-21 16:56:18 -0800278#define mptcp_for_each_subflow(__msk, __subflow) \
279 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
280
Florian Westphal3abc05d2021-02-04 15:23:30 -0800281static inline void msk_owned_by_me(const struct mptcp_sock *msk)
282{
283 sock_owned_by_me((const struct sock *)msk);
284}
285
Mat Martineauf870fa02020-01-21 16:56:15 -0800286static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
287{
288 return (struct mptcp_sock *)sk;
289}
290
Paolo Abenice599c52021-07-09 17:20:51 -0700291/* the msk socket don't use the backlog, also account for the bulk
292 * free memory
293 */
294static inline int __mptcp_rmem(const struct sock *sk)
295{
296 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released);
297}
298
Paolo Abeniea4ca582020-11-19 11:46:03 -0800299static inline int __mptcp_space(const struct sock *sk)
300{
Paolo Abenice599c52021-07-09 17:20:51 -0700301 return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk));
Paolo Abeniea4ca582020-11-19 11:46:03 -0800302}
303
Paolo Abenif0e6a4c2020-11-16 10:48:07 +0100304static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
305{
306 const struct mptcp_sock *msk = mptcp_sk(sk);
307
308 return READ_ONCE(msk->first_pending);
309}
310
311static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
312{
313 struct mptcp_sock *msk = mptcp_sk(sk);
314 struct mptcp_data_frag *cur;
315
316 cur = msk->first_pending;
317 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
318 list_next_entry(cur, list);
319}
320
321static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
322{
323 struct mptcp_sock *msk = mptcp_sk(sk);
324
325 if (!msk->first_pending)
326 return NULL;
327
328 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
329 return NULL;
330
331 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
332}
333
Florian Westphal7948f6c2020-03-27 14:48:46 -0700334static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
335{
336 struct mptcp_sock *msk = mptcp_sk(sk);
337
Paolo Abeni64b9cea2021-02-11 15:30:39 -0800338 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
339 return NULL;
340
Geliang Tanga386bc52020-06-15 16:34:28 +0800341 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
Florian Westphal7948f6c2020-03-27 14:48:46 -0700342}
343
Geliang Tangd0cc2982021-06-17 16:46:08 -0700344struct csum_pseudo_header {
345 __be64 data_seq;
346 __be32 subflow_seq;
347 __be16 data_len;
348 __sum16 csum;
349};
350
Peter Krystadcec37a62020-01-21 16:56:18 -0800351struct mptcp_subflow_request_sock {
352 struct tcp_request_sock sk;
Christoph Paaschd22f4982020-01-21 16:56:32 -0800353 u16 mp_capable : 1,
Peter Krystadcec37a62020-01-21 16:56:18 -0800354 mp_join : 1,
Geliang Tang06fe1712021-06-17 16:46:09 -0700355 backup : 1,
Geliang Tangbab6b882021-06-22 12:25:19 -0700356 csum_reqd : 1,
357 allow_join_id0 : 1;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700358 u8 local_id;
Peter Krystadf2962342020-03-27 14:48:39 -0700359 u8 remote_id;
Peter Krystadcec37a62020-01-21 16:56:18 -0800360 u64 local_key;
Peter Krystad79c09492020-01-21 16:56:20 -0800361 u64 idsn;
362 u32 token;
Mat Martineau648ef4b2020-01-21 16:56:24 -0800363 u32 ssn_offset;
Peter Krystadf2962342020-03-27 14:48:39 -0700364 u64 thmac;
365 u32 local_nonce;
366 u32 remote_nonce;
Paolo Abeni8fd4de12020-06-17 12:08:56 +0200367 struct mptcp_sock *msk;
Paolo Abeni2c5ebd02020-06-26 19:30:00 +0200368 struct hlist_nulls_node token_node;
Peter Krystadcec37a62020-01-21 16:56:18 -0800369};
370
371static inline struct mptcp_subflow_request_sock *
372mptcp_subflow_rsk(const struct request_sock *rsk)
373{
374 return (struct mptcp_subflow_request_sock *)rsk;
375}
376
Paolo Abeni67193312020-09-14 10:01:09 +0200377enum mptcp_data_avail {
378 MPTCP_SUBFLOW_NODATA,
379 MPTCP_SUBFLOW_DATA_AVAIL,
Paolo Abeni67193312020-09-14 10:01:09 +0200380};
381
Paolo Abenib19bc292021-01-20 15:39:14 +0100382struct mptcp_delegated_action {
383 struct napi_struct napi;
384 struct list_head head;
385};
386
387DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
388
389#define MPTCP_DELEGATE_SEND 0
390
Peter Krystad2303f992020-01-21 16:56:17 -0800391/* MPTCP subflow context */
392struct mptcp_subflow_context {
Peter Krystadcec37a62020-01-21 16:56:18 -0800393 struct list_head node;/* conn_list of subflows */
394 u64 local_key;
395 u64 remote_key;
Peter Krystad79c09492020-01-21 16:56:20 -0800396 u64 idsn;
Mat Martineau648ef4b2020-01-21 16:56:24 -0800397 u64 map_seq;
Christoph Paaschcc7972e2020-01-21 16:56:31 -0800398 u32 snd_isn;
Peter Krystad79c09492020-01-21 16:56:20 -0800399 u32 token;
Mat Martineau6d0060f2020-01-21 16:56:23 -0800400 u32 rel_write_seq;
Mat Martineau648ef4b2020-01-21 16:56:24 -0800401 u32 map_subflow_seq;
402 u32 ssn_offset;
403 u32 map_data_len;
Paolo Abenidd8bcd12021-06-17 16:46:16 -0700404 __wsum map_data_csum;
405 u32 map_csum_len;
Peter Krystadcec37a62020-01-21 16:56:18 -0800406 u32 request_mptcp : 1, /* send MP_CAPABLE */
Peter Krystadec3edaa2020-03-27 14:48:40 -0700407 request_join : 1, /* send MP_JOIN */
408 request_bkup : 1,
Peter Krystadcec37a62020-01-21 16:56:18 -0800409 mp_capable : 1, /* remote is MPTCP capable */
Peter Krystadf2962342020-03-27 14:48:39 -0700410 mp_join : 1, /* remote is JOINing */
Paolo Abeni0be534f2020-03-19 11:06:30 +0100411 fully_established : 1, /* path validated */
Peter Krystadf2962342020-03-27 14:48:39 -0700412 pm_notified : 1, /* PM hook called for established status */
Mat Martineau648ef4b2020-01-21 16:56:24 -0800413 conn_finished : 1,
414 map_valid : 1,
Paolo Abenidd8bcd12021-06-17 16:46:16 -0700415 map_csum_reqd : 1,
416 map_data_fin : 1,
Christoph Paaschd22f4982020-01-21 16:56:32 -0800417 mpc_map : 1,
Peter Krystadf2962342020-03-27 14:48:39 -0700418 backup : 1,
Geliang Tang06706542021-01-08 16:47:57 -0800419 send_mp_prio : 1,
Geliang Tangc25aeb42021-08-24 16:26:15 -0700420 send_mp_fail : 1,
Christoph Paaschd22f4982020-01-21 16:56:32 -0800421 rx_eof : 1,
Paolo Abenie16163b2020-11-16 10:48:09 +0100422 can_ack : 1, /* only after processing the remote a key */
Paolo Abeniff5a0b42021-08-13 15:15:45 -0700423 disposable : 1, /* ctx can be free at ulp release time */
424 stale : 1; /* unable to snd/rcv data, do not use for xmit */
Paolo Abeni67193312020-09-14 10:01:09 +0200425 enum mptcp_data_avail data_avail;
Peter Krystadf2962342020-03-27 14:48:39 -0700426 u32 remote_nonce;
427 u64 thmac;
428 u32 local_nonce;
Peter Krystadec3edaa2020-03-27 14:48:40 -0700429 u32 remote_token;
430 u8 hmac[MPTCPOPT_HMAC_LEN];
Peter Krystadf2962342020-03-27 14:48:39 -0700431 u8 local_id;
432 u8 remote_id;
Florian Westphaldc87efd2021-04-01 16:19:44 -0700433 u8 reset_seen:1;
434 u8 reset_transient:1;
435 u8 reset_reason:4;
Paolo Abeni71b7dec2021-08-13 15:15:42 -0700436 u8 stale_count;
Mat Martineau648ef4b2020-01-21 16:56:24 -0800437
Paolo Abenib19bc292021-01-20 15:39:14 +0100438 long delegated_status;
439 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
440
Paolo Abeni71b7dec2021-08-13 15:15:42 -0700441 u32 setsockopt_seq;
442 u32 stale_rcv_tstamp;
Florian Westphaldf00b082021-04-15 16:44:54 -0700443
Peter Krystad2303f992020-01-21 16:56:17 -0800444 struct sock *tcp_sock; /* tcp sk backpointer */
445 struct sock *conn; /* parent mptcp_sock */
Peter Krystadcec37a62020-01-21 16:56:18 -0800446 const struct inet_connection_sock_af_ops *icsk_af_ops;
Mat Martineau648ef4b2020-01-21 16:56:24 -0800447 void (*tcp_data_ready)(struct sock *sk);
448 void (*tcp_state_change)(struct sock *sk);
449 void (*tcp_write_space)(struct sock *sk);
Paolo Abeni15cc1042021-02-11 15:30:37 -0800450 void (*tcp_error_report)(struct sock *sk);
Mat Martineau648ef4b2020-01-21 16:56:24 -0800451
Peter Krystad2303f992020-01-21 16:56:17 -0800452 struct rcu_head rcu;
453};
454
455static inline struct mptcp_subflow_context *
456mptcp_subflow_ctx(const struct sock *sk)
457{
458 struct inet_connection_sock *icsk = inet_csk(sk);
459
460 /* Use RCU on icsk_ulp_data only for sock diag code */
461 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
462}
463
464static inline struct sock *
465mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
466{
467 return subflow->tcp_sock;
468}
469
Mat Martineau648ef4b2020-01-21 16:56:24 -0800470static inline u64
471mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
472{
473 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
474 subflow->ssn_offset -
475 subflow->map_subflow_seq;
476}
477
478static inline u64
479mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
480{
481 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
482}
483
Paolo Abeni0397c6d2020-11-19 11:45:58 -0800484static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
485 struct mptcp_subflow_context *subflow)
486{
487 sock_hold(mptcp_subflow_tcp_sock(subflow));
488 spin_lock_bh(&msk->join_list_lock);
489 list_add_tail(&subflow->node, &msk->join_list);
490 spin_unlock_bh(&msk->join_list_lock);
491}
492
Paolo Abenib19bc292021-01-20 15:39:14 +0100493void mptcp_subflow_process_delegated(struct sock *ssk);
494
495static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow)
496{
497 struct mptcp_delegated_action *delegated;
498 bool schedule;
499
500 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
501 * ensures the below list check sees list updates done prior to status
502 * bit changes
503 */
504 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) {
505 /* still on delegated list from previous scheduling */
506 if (!list_empty(&subflow->delegated_node))
507 return;
508
509 /* the caller held the subflow bh socket lock */
510 lockdep_assert_in_softirq();
511
512 delegated = this_cpu_ptr(&mptcp_delegated_actions);
513 schedule = list_empty(&delegated->head);
514 list_add_tail(&subflow->delegated_node, &delegated->head);
515 sock_hold(mptcp_subflow_tcp_sock(subflow));
516 if (schedule)
517 napi_schedule(&delegated->napi);
518 }
519}
520
521static inline struct mptcp_subflow_context *
522mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
523{
524 struct mptcp_subflow_context *ret;
525
526 if (list_empty(&delegated->head))
527 return NULL;
528
529 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
530 list_del_init(&ret->delegated_node);
531 return ret;
532}
533
534static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
535{
536 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
537}
538
539static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow)
540{
541 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
542 * touching the status bit
543 */
544 smp_wmb();
545 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
546}
547
Paolo Abeni6da14d72021-08-13 15:15:44 -0700548int mptcp_is_enabled(const struct net *net);
549unsigned int mptcp_get_add_addr_timeout(const struct net *net);
550int mptcp_is_checksum_enabled(const struct net *net);
551int mptcp_allow_join_id0(const struct net *net);
Paolo Abeniff5a0b42021-08-13 15:15:45 -0700552unsigned int mptcp_stale_loss_cnt(const struct net *net);
Paolo Abenib93df082020-07-23 13:02:32 +0200553void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
554 struct mptcp_options_received *mp_opt);
Paolo Abeni1e1d9d62021-08-13 15:15:43 -0700555bool __mptcp_retransmit_pending_data(struct sock *sk);
Paolo Abeniff5a0b42021-08-13 15:15:45 -0700556void __mptcp_push_pending(struct sock *sk, unsigned int flags);
Mat Martineau648ef4b2020-01-21 16:56:24 -0800557bool mptcp_subflow_data_available(struct sock *sk);
Paolo Abenid39dcec2020-06-26 19:29:59 +0200558void __init mptcp_subflow_init(void);
Geliang Tangd0876b22020-09-24 08:29:49 +0800559void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
Florian Westphala141e022021-02-12 15:59:55 -0800560void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
561 struct mptcp_subflow_context *subflow);
Mat Martineau340fa662021-09-02 11:51:19 -0700562void mptcp_subflow_send_ack(struct sock *ssk);
Paolo Abenid5824842020-10-09 19:00:00 +0200563void mptcp_subflow_reset(struct sock *ssk);
Paolo Abeni866f26f2021-01-20 15:39:10 +0100564void mptcp_sock_graft(struct sock *sk, struct socket *parent);
Geliang Tang1729cf12021-02-01 15:09:12 -0800565struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
Peter Krystadec3edaa2020-03-27 14:48:40 -0700566
567/* called with sk socket lock held */
Paolo Abenief0da3b2020-09-14 10:01:15 +0200568int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
Geliang Tangee285252021-08-17 15:07:22 -0700569 const struct mptcp_addr_info *remote);
Peter Krystad2303f992020-01-21 16:56:17 -0800570int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
Geliang Tang1729cf12021-02-01 15:09:12 -0800571void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
572 struct sockaddr_storage *addr,
573 unsigned short family);
Peter Krystad2303f992020-01-21 16:56:17 -0800574
Paolo Abeniff5a0b42021-08-13 15:15:45 -0700575static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow)
Geliang Tang43f11402021-04-16 15:38:03 -0700576{
577 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
578
579 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */
580 if (subflow->request_join && !subflow->fully_established)
581 return false;
582
583 /* only send if our side has not closed yet */
584 return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
585}
586
Paolo Abeniff5a0b42021-08-13 15:15:45 -0700587void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);
588
589bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);
590
Mat Martineau648ef4b2020-01-21 16:56:24 -0800591static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
592 struct mptcp_subflow_context *ctx)
593{
594 sk->sk_data_ready = ctx->tcp_data_ready;
595 sk->sk_state_change = ctx->tcp_state_change;
596 sk->sk_write_space = ctx->tcp_write_space;
Paolo Abeni15cc1042021-02-11 15:30:37 -0800597 sk->sk_error_report = ctx->tcp_error_report;
Mat Martineau648ef4b2020-01-21 16:56:24 -0800598
599 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
600}
601
Geliang Tang478d7702021-08-24 16:26:17 -0700602static inline bool mptcp_has_another_subflow(struct sock *ssk)
603{
604 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk), *tmp;
605 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
606
607 mptcp_for_each_subflow(msk, tmp) {
608 if (tmp != subflow)
609 return true;
610 }
611
612 return false;
613}
614
Paolo Abenid39dcec2020-06-26 19:29:59 +0200615void __init mptcp_proto_init(void);
Matthieu Baerts784325e2020-01-21 16:56:28 -0800616#if IS_ENABLED(CONFIG_MPTCP_IPV6)
Paolo Abenid39dcec2020-06-26 19:29:59 +0200617int __init mptcp_proto_v6_init(void);
Matthieu Baerts784325e2020-01-21 16:56:28 -0800618#endif
Mat Martineau648ef4b2020-01-21 16:56:24 -0800619
Paolo Abenifca5c822020-04-20 16:25:06 +0200620struct sock *mptcp_sk_clone(const struct sock *sk,
Paolo Abenicfde1412020-04-30 15:01:52 +0200621 const struct mptcp_options_received *mp_opt,
Paolo Abenifca5c822020-04-20 16:25:06 +0200622 struct request_sock *req);
Geliang Tangc8632252021-06-17 16:46:12 -0700623void mptcp_get_options(const struct sock *sk,
624 const struct sk_buff *skb,
Paolo Abenicfde1412020-04-30 15:01:52 +0200625 struct mptcp_options_received *mp_opt);
Peter Krystadcec37a62020-01-21 16:56:18 -0800626
627void mptcp_finish_connect(struct sock *sk);
Paolo Abeni490274b2021-06-21 17:33:08 -0700628void __mptcp_set_connected(struct sock *sk);
Paolo Abenib93df082020-07-23 13:02:32 +0200629static inline bool mptcp_is_fully_established(struct sock *sk)
630{
631 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
632 READ_ONCE(mptcp_sk(sk)->fully_established);
633}
Florian Westphala6b118f2020-06-30 21:24:45 +0200634void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
Florian Westphal2e522132020-02-26 10:14:51 +0100635void mptcp_data_ready(struct sock *sk, struct sock *ssk);
Peter Krystadf2962342020-03-27 14:48:39 -0700636bool mptcp_finish_join(struct sock *sk);
Paolo Abeniba8f48f2020-11-16 10:48:05 +0100637bool mptcp_schedule_work(struct sock *sk);
Paolo Abeni0abdde82021-04-15 16:44:51 -0700638int mptcp_setsockopt(struct sock *sk, int level, int optname,
639 sockptr_t optval, unsigned int optlen);
640int mptcp_getsockopt(struct sock *sk, int level, int optname,
641 char __user *optval, int __user *option);
642
Paolo Abeni15023282021-06-18 15:02:20 -0700643u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
644static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
645{
646 if (use_64bit)
647 return cur_seq;
648
649 return __mptcp_expand_seq(old_seq, cur_seq);
650}
Paolo Abeni219d0492020-12-16 12:48:34 +0100651void __mptcp_check_push(struct sock *sk, struct sock *ssk);
Paolo Abeni7439d682020-11-27 11:10:26 +0100652void __mptcp_data_acked(struct sock *sk);
Paolo Abeni15cc1042021-02-11 15:30:37 -0800653void __mptcp_error_report(struct sock *sk);
Florian Westphal59832e22020-04-02 13:44:52 +0200654void mptcp_subflow_eof(struct sock *sk);
Mat Martineau1a49b2c2020-09-29 15:08:20 -0700655bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
Geliang Tang84dfe362020-11-19 11:46:00 -0800656void __mptcp_flush_join_list(struct mptcp_sock *msk);
Paolo Abenie16163b2020-11-16 10:48:09 +0100657static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
658{
659 return READ_ONCE(msk->snd_data_fin_enable) &&
660 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
661}
662
Paolo Abeni5cf92bb2021-01-20 15:39:11 +0100663static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
664{
665 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
666 return false;
667
668 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
669 return true;
670}
671
672static inline void mptcp_write_space(struct sock *sk)
673{
674 if (sk_stream_is_writeable(sk)) {
675 /* pairs with memory barrier in mptcp_poll */
676 smp_mb();
677 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
678 sk_stream_write_space(sk);
679 }
680}
681
Geliang Tang5c8c1642020-09-24 08:29:57 +0800682void mptcp_destroy_common(struct mptcp_sock *msk);
Peter Krystadcec37a62020-01-21 16:56:18 -0800683
Jianguo Wuc68a0cd2021-05-27 16:54:25 -0700684#define MPTCP_TOKEN_MAX_RETRIES 4
685
Paolo Abeni2c5ebd02020-06-26 19:30:00 +0200686void __init mptcp_token_init(void);
687static inline void mptcp_token_init_request(struct request_sock *req)
688{
689 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
690}
691
Peter Krystad79c09492020-01-21 16:56:20 -0800692int mptcp_token_new_request(struct request_sock *req);
Paolo Abeni2c5ebd02020-06-26 19:30:00 +0200693void mptcp_token_destroy_request(struct request_sock *req);
Peter Krystad79c09492020-01-21 16:56:20 -0800694int mptcp_token_new_connect(struct sock *sk);
Paolo Abeni2c5ebd02020-06-26 19:30:00 +0200695void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
696 struct mptcp_sock *msk);
Florian Westphalc83a47e2020-07-30 21:25:54 +0200697bool mptcp_token_exists(u32 token);
Florian Westphalea1300b2021-09-23 17:04:11 -0700698struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token);
Paolo Abeni96d890d2020-07-09 15:12:40 +0200699struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
700 long *s_num);
Paolo Abeni2c5ebd02020-06-26 19:30:00 +0200701void mptcp_token_destroy(struct mptcp_sock *msk);
Peter Krystad79c09492020-01-21 16:56:20 -0800702
703void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
Peter Krystad79c09492020-01-21 16:56:20 -0800704
Peter Krystad3df523a2020-03-27 14:48:37 -0700705void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
Peter Krystad79c09492020-01-21 16:56:20 -0800706
Paolo Abenid39dcec2020-06-26 19:29:59 +0200707void __init mptcp_pm_init(void);
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700708void mptcp_pm_data_init(struct mptcp_sock *msk);
Paolo Abeni71b7dec2021-08-13 15:15:42 -0700709void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
Paolo Abeniff5a0b42021-08-13 15:15:45 -0700710void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
Florian Westphal6c714f12021-02-12 15:59:58 -0800711void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
712void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700713bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
714void mptcp_pm_connection_closed(struct mptcp_sock *msk);
Geliang Tang625352002021-03-26 11:26:33 -0700715void mptcp_pm_subflow_established(struct mptcp_sock *msk);
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700716void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
717void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
718 const struct mptcp_addr_info *addr);
Geliang Tang557963c2021-03-26 11:26:38 -0700719void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
720 struct mptcp_addr_info *addr);
Geliang Tang84dfe362020-11-19 11:46:00 -0800721void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
Geliang Tangb46a0232021-03-26 11:26:41 -0700722void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
Geliang Tang5c4a8242021-03-12 17:16:13 -0800723void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
724 const struct mptcp_rm_list *rm_list);
Geliang Tang40453a52021-01-08 16:47:58 -0800725void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
Geliang Tang5580d412021-08-24 16:26:16 -0700726void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
Geliang Tangb6c08382020-09-24 08:29:54 +0800727void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
Geliang Tang5bc56382021-02-01 15:09:15 -0800728bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
Geliang Tang00cfd772020-09-24 08:30:02 +0800729struct mptcp_pm_add_entry *
730mptcp_pm_del_add_timer(struct mptcp_sock *msk,
Davide Carattid58300c2021-05-25 14:23:13 -0700731 struct mptcp_addr_info *addr, bool check_id);
Geliang Tangd88c4762021-03-26 11:26:37 -0700732struct mptcp_pm_add_entry *
733mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk,
734 struct mptcp_addr_info *addr);
Geliang Tangee285252021-08-17 15:07:22 -0700735int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
736 u8 *flags, int *ifindex);
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700737
738int mptcp_pm_announce_addr(struct mptcp_sock *msk,
Geliang Tang6a6c05a2020-09-24 08:29:50 +0800739 const struct mptcp_addr_info *addr,
Geliang Tangf7efc772021-03-26 11:26:31 -0700740 bool echo);
Geliang Tangcbde2782021-03-12 17:16:12 -0800741int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
Geliang Tangddd14bb2021-03-12 17:16:16 -0800742int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700743
Florian Westphalb911c972021-02-12 16:00:01 -0800744void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
745 const struct sock *ssk, gfp_t gfp);
746void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
747void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
748
Geliang Tangf643b802020-09-24 08:29:47 +0800749static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700750{
Yonglong Li18fc1a92021-08-23 18:05:40 -0700751 return READ_ONCE(msk->pm.addr_signal) &
752 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
753}
754
755static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
756{
Geliang Tang13ad9f02020-12-09 15:51:27 -0800757 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
Geliang Tangd91d3222020-11-19 11:45:59 -0800758}
759
760static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
761{
Geliang Tang13ad9f02020-12-09 15:51:27 -0800762 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700763}
764
Geliang Tang5cb104a2020-09-24 08:29:48 +0800765static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
766{
Geliang Tang13ad9f02020-12-09 15:51:27 -0800767 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
Geliang Tang5cb104a2020-09-24 08:29:48 +0800768}
769
Geliang Tang4a2777a82020-12-09 15:51:22 -0800770static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700771{
Geliang Tang2ec72fa2020-12-09 15:51:21 -0800772 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
773
774 if (family == AF_INET6)
775 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
776 if (!echo)
777 len += MPTCPOPT_THMAC_LEN;
Davide Caratti27ab92d2021-03-08 10:00:04 +0100778 /* account for 2 trailing 'nop' options */
Geliang Tang4a2777a82020-12-09 15:51:22 -0800779 if (port)
Davide Caratti27ab92d2021-03-08 10:00:04 +0100780 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
Geliang Tang2ec72fa2020-12-09 15:51:21 -0800781
782 return len;
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700783}
784
Geliang Tang6445e172021-03-12 17:16:11 -0800785static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
786{
787 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
788 return -EINVAL;
789
790 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
791}
792
Yonglong Li1f5e9e22021-08-23 18:05:39 -0700793bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct sk_buff *skb,
794 unsigned int opt_size, unsigned int remaining,
Yonglong Lif462a442021-08-23 18:05:42 -0700795 struct mptcp_addr_info *addr, bool *echo,
Yonglong Li1f5e9e22021-08-23 18:05:39 -0700796 bool *port, bool *drop_other_suboptions);
Geliang Tang5cb104a2020-09-24 08:29:48 +0800797bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
Geliang Tang6445e172021-03-12 17:16:11 -0800798 struct mptcp_rm_list *rm_list);
Peter Krystad1b1c7a02020-03-27 14:48:38 -0700799int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
800
Paolo Abenid39dcec2020-06-26 19:29:59 +0200801void __init mptcp_pm_nl_init(void);
Paolo Abeni01cacb02020-03-27 14:48:51 -0700802void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
Florian Westphale9801432021-02-12 15:59:54 -0800803void mptcp_pm_nl_work(struct mptcp_sock *msk);
Geliang Tangddd14bb2021-03-12 17:16:16 -0800804void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
805 const struct mptcp_rm_list *rm_list);
Paolo Abeni01cacb02020-03-27 14:48:51 -0700806int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
Geliang Tanga914e582021-02-01 15:09:07 -0800807unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
808unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
809unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
Geliang Tang0caf3ad2021-02-12 16:52:02 -0800810unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
Paolo Abeni01cacb02020-03-27 14:48:51 -0700811
Florian Westphal78962482021-04-15 16:44:53 -0700812void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
813void mptcp_sockopt_sync_all(struct mptcp_sock *msk);
814
Florian Westphaldc87efd2021-04-01 16:19:44 -0700815static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
Mat Martineau6d0060f2020-01-21 16:56:23 -0800816{
817 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
818}
819
Davide Caratti5147dfb2020-03-27 14:48:49 -0700820void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
821
Paolo Abenid5f49192020-09-14 10:01:17 +0200822static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
Davide Carattie1ff9e82020-06-29 22:26:20 +0200823{
824 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
825}
826
Paolo Abenid5f49192020-09-14 10:01:17 +0200827static inline bool mptcp_check_fallback(const struct sock *sk)
Davide Carattie1ff9e82020-06-29 22:26:20 +0200828{
829 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
830 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
831
832 return __mptcp_check_fallback(msk);
833}
834
835static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
836{
837 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
838 pr_debug("TCP fallback already done (msk=%p)", msk);
839 return;
840 }
841 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
842}
843
844static inline void mptcp_do_fallback(struct sock *sk)
845{
846 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
847 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
848
849 __mptcp_do_fallback(msk);
850}
851
852#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
853
Davide Caratti8fd73802020-06-29 22:26:21 +0200854static inline bool subflow_simultaneous_connect(struct sock *sk)
855{
856 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
857 struct sock *parent = subflow->conn;
858
859 return sk->sk_state == TCP_ESTABLISHED &&
860 !mptcp_sk(parent)->pm.server_side &&
861 !subflow->conn_finished;
862}
863
Florian Westphal9466a1c2020-07-30 21:25:56 +0200864#ifdef CONFIG_SYN_COOKIES
865void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
866 struct sk_buff *skb);
867bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
868 struct sk_buff *skb);
869void __init mptcp_join_cookie_init(void);
870#else
871static inline void
872subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
873 struct sk_buff *skb) {}
874static inline bool
875mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
876 struct sk_buff *skb)
877{
878 return false;
879}
880
881static inline void mptcp_join_cookie_init(void) {}
882#endif
883
Mat Martineauf870fa02020-01-21 16:56:15 -0800884#endif /* __MPTCP_PROTOCOL_H */