![Florian Westphal](/assets/img/avatar_default.png)
This is needed at least until proper MPTCP-Level fin/reset signalling gets added: We wake parent when a subflow changes, but we should do this only when all subflows have closed, not just one. Schedule the mptcp worker and tell it to check eof state on all subflows. Only flag mptcp socket as closed and wake userspace processes blocking in poll if all subflows have closed. Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
423 lines
12 KiB
C
423 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Multipath TCP
|
|
*
|
|
* Copyright (c) 2017 - 2019, Intel Corporation.
|
|
*/
|
|
|
|
#ifndef __MPTCP_PROTOCOL_H
|
|
#define __MPTCP_PROTOCOL_H
|
|
|
|
#include <linux/random.h>
|
|
#include <net/tcp.h>
|
|
#include <net/inet_connection_sock.h>
|
|
|
|
#define MPTCP_SUPPORTED_VERSION 1
|
|
|
|
/* MPTCP option bits */
|
|
#define OPTION_MPTCP_MPC_SYN BIT(0)
|
|
#define OPTION_MPTCP_MPC_SYNACK BIT(1)
|
|
#define OPTION_MPTCP_MPC_ACK BIT(2)
|
|
#define OPTION_MPTCP_MPJ_SYN BIT(3)
|
|
#define OPTION_MPTCP_MPJ_SYNACK BIT(4)
|
|
#define OPTION_MPTCP_MPJ_ACK BIT(5)
|
|
#define OPTION_MPTCP_ADD_ADDR BIT(6)
|
|
#define OPTION_MPTCP_ADD_ADDR6 BIT(7)
|
|
#define OPTION_MPTCP_RM_ADDR BIT(8)
|
|
|
|
/* MPTCP option subtypes */
|
|
#define MPTCPOPT_MP_CAPABLE 0
|
|
#define MPTCPOPT_MP_JOIN 1
|
|
#define MPTCPOPT_DSS 2
|
|
#define MPTCPOPT_ADD_ADDR 3
|
|
#define MPTCPOPT_RM_ADDR 4
|
|
#define MPTCPOPT_MP_PRIO 5
|
|
#define MPTCPOPT_MP_FAIL 6
|
|
#define MPTCPOPT_MP_FASTCLOSE 7
|
|
|
|
/* MPTCP suboption lengths */
|
|
#define TCPOLEN_MPTCP_MPC_SYN 4
|
|
#define TCPOLEN_MPTCP_MPC_SYNACK 12
|
|
#define TCPOLEN_MPTCP_MPC_ACK 20
|
|
#define TCPOLEN_MPTCP_MPC_ACK_DATA 22
|
|
#define TCPOLEN_MPTCP_MPJ_SYN 12
|
|
#define TCPOLEN_MPTCP_MPJ_SYNACK 16
|
|
#define TCPOLEN_MPTCP_MPJ_ACK 24
|
|
#define TCPOLEN_MPTCP_DSS_BASE 4
|
|
#define TCPOLEN_MPTCP_DSS_ACK32 4
|
|
#define TCPOLEN_MPTCP_DSS_ACK64 8
|
|
#define TCPOLEN_MPTCP_DSS_MAP32 10
|
|
#define TCPOLEN_MPTCP_DSS_MAP64 14
|
|
#define TCPOLEN_MPTCP_DSS_CHECKSUM 2
|
|
#define TCPOLEN_MPTCP_ADD_ADDR 16
|
|
#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
|
|
#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
|
|
#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
|
|
#define TCPOLEN_MPTCP_ADD_ADDR6 28
|
|
#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
|
|
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
|
|
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
|
|
#define TCPOLEN_MPTCP_PORT_LEN 2
|
|
#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
|
|
|
|
/* MPTCP MP_JOIN flags */
|
|
#define MPTCPOPT_BACKUP BIT(0)
|
|
#define MPTCPOPT_HMAC_LEN 20
|
|
#define MPTCPOPT_THMAC_LEN 8
|
|
|
|
/* MPTCP MP_CAPABLE flags */
|
|
#define MPTCP_VERSION_MASK (0x0F)
|
|
#define MPTCP_CAP_CHECKSUM_REQD BIT(7)
|
|
#define MPTCP_CAP_EXTENSIBILITY BIT(6)
|
|
#define MPTCP_CAP_HMAC_SHA256 BIT(0)
|
|
#define MPTCP_CAP_FLAG_MASK (0x3F)
|
|
|
|
/* MPTCP DSS flags */
|
|
#define MPTCP_DSS_DATA_FIN BIT(4)
|
|
#define MPTCP_DSS_DSN64 BIT(3)
|
|
#define MPTCP_DSS_HAS_MAP BIT(2)
|
|
#define MPTCP_DSS_ACK64 BIT(1)
|
|
#define MPTCP_DSS_HAS_ACK BIT(0)
|
|
#define MPTCP_DSS_FLAG_MASK (0x1F)
|
|
|
|
/* MPTCP ADD_ADDR flags */
|
|
#define MPTCP_ADDR_ECHO BIT(0)
|
|
#define MPTCP_ADDR_HMAC_LEN 20
|
|
#define MPTCP_ADDR_IPVERSION_4 4
|
|
#define MPTCP_ADDR_IPVERSION_6 6
|
|
|
|
/* MPTCP socket flags */
|
|
#define MPTCP_DATA_READY 0
|
|
#define MPTCP_SEND_SPACE 1
|
|
#define MPTCP_WORK_RTX 2
|
|
#define MPTCP_WORK_EOF 3
|
|
|
|
static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
|
|
{
|
|
return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
|
|
((nib & 0xF) << 8) | field);
|
|
}
|
|
|
|
#define MPTCP_PM_MAX_ADDR 4
|
|
|
|
struct mptcp_addr_info {
|
|
sa_family_t family;
|
|
__be16 port;
|
|
u8 id;
|
|
union {
|
|
struct in_addr addr;
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
struct in6_addr addr6;
|
|
#endif
|
|
};
|
|
};
|
|
|
|
enum mptcp_pm_status {
|
|
MPTCP_PM_ADD_ADDR_RECEIVED,
|
|
MPTCP_PM_ESTABLISHED,
|
|
MPTCP_PM_SUBFLOW_ESTABLISHED,
|
|
};
|
|
|
|
struct mptcp_pm_data {
|
|
struct mptcp_addr_info local;
|
|
struct mptcp_addr_info remote;
|
|
|
|
spinlock_t lock; /*protects the whole PM data */
|
|
|
|
bool addr_signal;
|
|
bool server_side;
|
|
bool work_pending;
|
|
bool accept_addr;
|
|
bool accept_subflow;
|
|
u8 add_addr_signaled;
|
|
u8 add_addr_accepted;
|
|
u8 local_addr_used;
|
|
u8 subflows;
|
|
u8 add_addr_signal_max;
|
|
u8 add_addr_accept_max;
|
|
u8 local_addr_max;
|
|
u8 subflows_max;
|
|
u8 status;
|
|
|
|
struct work_struct work;
|
|
};
|
|
|
|
struct mptcp_data_frag {
|
|
struct list_head list;
|
|
u64 data_seq;
|
|
int data_len;
|
|
int offset;
|
|
int overhead;
|
|
struct page *page;
|
|
};
|
|
|
|
/* MPTCP connection sock */
|
|
struct mptcp_sock {
|
|
/* inet_connection_sock must be the first member */
|
|
struct inet_connection_sock sk;
|
|
u64 local_key;
|
|
u64 remote_key;
|
|
u64 write_seq;
|
|
u64 ack_seq;
|
|
atomic64_t snd_una;
|
|
unsigned long timer_ival;
|
|
u32 token;
|
|
unsigned long flags;
|
|
bool can_ack;
|
|
spinlock_t join_list_lock;
|
|
struct work_struct work;
|
|
struct list_head conn_list;
|
|
struct list_head rtx_queue;
|
|
struct list_head join_list;
|
|
struct skb_ext *cached_ext; /* for the next sendmsg */
|
|
struct socket *subflow; /* outgoing connect/listener/!mp_capable */
|
|
struct sock *first;
|
|
struct mptcp_pm_data pm;
|
|
};
|
|
|
|
#define mptcp_for_each_subflow(__msk, __subflow) \
|
|
list_for_each_entry(__subflow, &((__msk)->conn_list), node)
|
|
|
|
static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
|
|
{
|
|
return (struct mptcp_sock *)sk;
|
|
}
|
|
|
|
static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
|
|
if (list_empty(&msk->rtx_queue))
|
|
return NULL;
|
|
|
|
return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
|
|
}
|
|
|
|
static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
|
|
if (list_empty(&msk->rtx_queue))
|
|
return NULL;
|
|
|
|
return list_first_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
|
|
}
|
|
|
|
struct mptcp_subflow_request_sock {
|
|
struct tcp_request_sock sk;
|
|
u16 mp_capable : 1,
|
|
mp_join : 1,
|
|
backup : 1,
|
|
remote_key_valid : 1;
|
|
u8 local_id;
|
|
u8 remote_id;
|
|
u64 local_key;
|
|
u64 remote_key;
|
|
u64 idsn;
|
|
u32 token;
|
|
u32 ssn_offset;
|
|
u64 thmac;
|
|
u32 local_nonce;
|
|
u32 remote_nonce;
|
|
};
|
|
|
|
static inline struct mptcp_subflow_request_sock *
|
|
mptcp_subflow_rsk(const struct request_sock *rsk)
|
|
{
|
|
return (struct mptcp_subflow_request_sock *)rsk;
|
|
}
|
|
|
|
/* MPTCP subflow context */
|
|
struct mptcp_subflow_context {
|
|
struct list_head node;/* conn_list of subflows */
|
|
u64 local_key;
|
|
u64 remote_key;
|
|
u64 idsn;
|
|
u64 map_seq;
|
|
u32 snd_isn;
|
|
u32 token;
|
|
u32 rel_write_seq;
|
|
u32 map_subflow_seq;
|
|
u32 ssn_offset;
|
|
u32 map_data_len;
|
|
u32 request_mptcp : 1, /* send MP_CAPABLE */
|
|
request_join : 1, /* send MP_JOIN */
|
|
request_bkup : 1,
|
|
mp_capable : 1, /* remote is MPTCP capable */
|
|
mp_join : 1, /* remote is JOINing */
|
|
fully_established : 1, /* path validated */
|
|
pm_notified : 1, /* PM hook called for established status */
|
|
conn_finished : 1,
|
|
map_valid : 1,
|
|
mpc_map : 1,
|
|
backup : 1,
|
|
data_avail : 1,
|
|
rx_eof : 1,
|
|
data_fin_tx_enable : 1,
|
|
can_ack : 1; /* only after processing the remote a key */
|
|
u64 data_fin_tx_seq;
|
|
u32 remote_nonce;
|
|
u64 thmac;
|
|
u32 local_nonce;
|
|
u32 remote_token;
|
|
u8 hmac[MPTCPOPT_HMAC_LEN];
|
|
u8 local_id;
|
|
u8 remote_id;
|
|
|
|
struct sock *tcp_sock; /* tcp sk backpointer */
|
|
struct sock *conn; /* parent mptcp_sock */
|
|
const struct inet_connection_sock_af_ops *icsk_af_ops;
|
|
void (*tcp_data_ready)(struct sock *sk);
|
|
void (*tcp_state_change)(struct sock *sk);
|
|
void (*tcp_write_space)(struct sock *sk);
|
|
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
static inline struct mptcp_subflow_context *
|
|
mptcp_subflow_ctx(const struct sock *sk)
|
|
{
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
|
|
/* Use RCU on icsk_ulp_data only for sock diag code */
|
|
return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
|
|
}
|
|
|
|
static inline struct sock *
|
|
mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
|
|
{
|
|
return subflow->tcp_sock;
|
|
}
|
|
|
|
static inline u64
|
|
mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
|
|
{
|
|
return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
|
|
subflow->ssn_offset -
|
|
subflow->map_subflow_seq;
|
|
}
|
|
|
|
static inline u64
|
|
mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
|
|
{
|
|
return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
|
|
}
|
|
|
|
int mptcp_is_enabled(struct net *net);
|
|
bool mptcp_subflow_data_available(struct sock *sk);
|
|
void mptcp_subflow_init(void);
|
|
|
|
/* called with sk socket lock held */
|
|
int __mptcp_subflow_connect(struct sock *sk, int ifindex,
|
|
const struct mptcp_addr_info *loc,
|
|
const struct mptcp_addr_info *remote);
|
|
int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
|
|
|
|
static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
|
|
struct mptcp_subflow_context *ctx)
|
|
{
|
|
sk->sk_data_ready = ctx->tcp_data_ready;
|
|
sk->sk_state_change = ctx->tcp_state_change;
|
|
sk->sk_write_space = ctx->tcp_write_space;
|
|
|
|
inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
|
|
}
|
|
|
|
extern const struct inet_connection_sock_af_ops ipv4_specific;
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
extern const struct inet_connection_sock_af_ops ipv6_specific;
|
|
#endif
|
|
|
|
void mptcp_proto_init(void);
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
int mptcp_proto_v6_init(void);
|
|
#endif
|
|
|
|
struct sock *mptcp_sk_clone(const struct sock *sk, struct request_sock *req);
|
|
void mptcp_get_options(const struct sk_buff *skb,
|
|
struct tcp_options_received *opt_rx);
|
|
|
|
void mptcp_finish_connect(struct sock *sk);
|
|
void mptcp_data_ready(struct sock *sk, struct sock *ssk);
|
|
bool mptcp_finish_join(struct sock *sk);
|
|
void mptcp_data_acked(struct sock *sk);
|
|
void mptcp_subflow_eof(struct sock *sk);
|
|
|
|
int mptcp_token_new_request(struct request_sock *req);
|
|
void mptcp_token_destroy_request(u32 token);
|
|
int mptcp_token_new_connect(struct sock *sk);
|
|
int mptcp_token_new_accept(u32 token, struct sock *conn);
|
|
struct mptcp_sock *mptcp_token_get_sock(u32 token);
|
|
void mptcp_token_destroy(u32 token);
|
|
|
|
void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
|
|
static inline void mptcp_crypto_key_gen_sha(u64 *key, u32 *token, u64 *idsn)
|
|
{
|
|
/* we might consider a faster version that computes the key as a
|
|
* hash of some information available in the MPTCP socket. Use
|
|
* random data at the moment, as it's probably the safest option
|
|
* in case multiple sockets are opened in different namespaces at
|
|
* the same time.
|
|
*/
|
|
get_random_bytes(key, sizeof(u64));
|
|
mptcp_crypto_key_sha(*key, token, idsn);
|
|
}
|
|
|
|
void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
|
|
|
|
void mptcp_pm_init(void);
|
|
void mptcp_pm_data_init(struct mptcp_sock *msk);
|
|
void mptcp_pm_close(struct mptcp_sock *msk);
|
|
void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
|
|
void mptcp_pm_fully_established(struct mptcp_sock *msk);
|
|
bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
|
|
void mptcp_pm_connection_closed(struct mptcp_sock *msk);
|
|
void mptcp_pm_subflow_established(struct mptcp_sock *msk,
|
|
struct mptcp_subflow_context *subflow);
|
|
void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
|
|
void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
|
|
const struct mptcp_addr_info *addr);
|
|
|
|
int mptcp_pm_announce_addr(struct mptcp_sock *msk,
|
|
const struct mptcp_addr_info *addr);
|
|
int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
|
|
int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 remote_id);
|
|
|
|
static inline bool mptcp_pm_should_signal(struct mptcp_sock *msk)
|
|
{
|
|
return READ_ONCE(msk->pm.addr_signal);
|
|
}
|
|
|
|
static inline unsigned int mptcp_add_addr_len(int family)
|
|
{
|
|
if (family == AF_INET)
|
|
return TCPOLEN_MPTCP_ADD_ADDR;
|
|
return TCPOLEN_MPTCP_ADD_ADDR6;
|
|
}
|
|
|
|
bool mptcp_pm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
|
|
struct mptcp_addr_info *saddr);
|
|
int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
|
|
|
|
void mptcp_pm_nl_init(void);
|
|
void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
|
|
void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
|
|
void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
|
|
void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
|
|
int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
|
|
|
|
static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
|
|
{
|
|
return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
|
|
}
|
|
|
|
static inline bool before64(__u64 seq1, __u64 seq2)
|
|
{
|
|
return (__s64)(seq1 - seq2) < 0;
|
|
}
|
|
|
|
#define after64(seq2, seq1) before64(seq1, seq2)
|
|
|
|
void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
|
|
|
|
#endif /* __MPTCP_PROTOCOL_H */
|