mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
61bc6e82f9
Will be re-used from getsockopt path. Since diag can be a module, we can't export the helper from diag, it needs to be moved to core. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
289 lines
6.4 KiB
C
289 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Multipath TCP
|
|
*
|
|
* Copyright (c) 2017 - 2019, Intel Corporation.
|
|
*/
|
|
|
|
#ifndef __NET_MPTCP_H
|
|
#define __NET_MPTCP_H
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/types.h>
|
|
|
|
struct mptcp_info;
|
|
struct mptcp_sock;
|
|
struct seq_file;
|
|
|
|
/* MPTCP sk_buff extension data */
|
|
struct mptcp_ext {
|
|
union {
|
|
u64 data_ack;
|
|
u32 data_ack32;
|
|
};
|
|
u64 data_seq;
|
|
u32 subflow_seq;
|
|
u16 data_len;
|
|
__sum16 csum;
|
|
u8 use_map:1,
|
|
dsn64:1,
|
|
data_fin:1,
|
|
use_ack:1,
|
|
ack64:1,
|
|
mpc_map:1,
|
|
frozen:1,
|
|
reset_transient:1;
|
|
u8 reset_reason:4,
|
|
csum_reqd:1;
|
|
};
|
|
|
|
#define MPTCP_RM_IDS_MAX 8
|
|
|
|
struct mptcp_rm_list {
|
|
u8 ids[MPTCP_RM_IDS_MAX];
|
|
u8 nr;
|
|
};
|
|
|
|
struct mptcp_addr_info {
|
|
u8 id;
|
|
sa_family_t family;
|
|
__be16 port;
|
|
union {
|
|
struct in_addr addr;
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
struct in6_addr addr6;
|
|
#endif
|
|
};
|
|
};
|
|
|
|
struct mptcp_out_options {
|
|
#if IS_ENABLED(CONFIG_MPTCP)
|
|
u16 suboptions;
|
|
struct mptcp_rm_list rm_list;
|
|
u8 join_id;
|
|
u8 backup;
|
|
u8 reset_reason:4,
|
|
reset_transient:1,
|
|
csum_reqd:1,
|
|
allow_join_id0:1;
|
|
union {
|
|
struct {
|
|
u64 sndr_key;
|
|
u64 rcvr_key;
|
|
};
|
|
struct {
|
|
struct mptcp_addr_info addr;
|
|
u64 ahmac;
|
|
};
|
|
struct {
|
|
struct mptcp_ext ext_copy;
|
|
u64 fail_seq;
|
|
};
|
|
struct {
|
|
u32 nonce;
|
|
u32 token;
|
|
u64 thmac;
|
|
u8 hmac[20];
|
|
};
|
|
};
|
|
#endif
|
|
};
|
|
|
|
#ifdef CONFIG_MPTCP
|
|
extern struct request_sock_ops mptcp_subflow_request_sock_ops;
|
|
|
|
void mptcp_init(void);
|
|
|
|
static inline bool sk_is_mptcp(const struct sock *sk)
|
|
{
|
|
return tcp_sk(sk)->is_mptcp;
|
|
}
|
|
|
|
static inline bool rsk_is_mptcp(const struct request_sock *req)
|
|
{
|
|
return tcp_rsk(req)->is_mptcp;
|
|
}
|
|
|
|
static inline bool rsk_drop_req(const struct request_sock *req)
|
|
{
|
|
return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
|
|
}
|
|
|
|
void mptcp_space(const struct sock *ssk, int *space, int *full_space);
|
|
bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
|
|
unsigned int *size, struct mptcp_out_options *opts);
|
|
bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
|
|
struct mptcp_out_options *opts);
|
|
bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
|
|
unsigned int *size, unsigned int remaining,
|
|
struct mptcp_out_options *opts);
|
|
bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
|
|
|
|
void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
|
|
struct mptcp_out_options *opts);
|
|
|
|
void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info);
|
|
|
|
/* move the skb extension owership, with the assumption that 'to' is
|
|
* newly allocated
|
|
*/
|
|
static inline void mptcp_skb_ext_move(struct sk_buff *to,
|
|
struct sk_buff *from)
|
|
{
|
|
if (!skb_ext_exist(from, SKB_EXT_MPTCP))
|
|
return;
|
|
|
|
if (WARN_ON_ONCE(to->active_extensions))
|
|
skb_ext_put(to);
|
|
|
|
to->active_extensions = from->active_extensions;
|
|
to->extensions = from->extensions;
|
|
from->active_extensions = 0;
|
|
}
|
|
|
|
static inline void mptcp_skb_ext_copy(struct sk_buff *to,
|
|
struct sk_buff *from)
|
|
{
|
|
struct mptcp_ext *from_ext;
|
|
|
|
from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
|
|
if (!from_ext)
|
|
return;
|
|
|
|
from_ext->frozen = 1;
|
|
skb_ext_copy(to, from);
|
|
}
|
|
|
|
static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
|
|
const struct mptcp_ext *from_ext)
|
|
{
|
|
/* MPTCP always clears the ext when adding it to the skb, so
|
|
* holes do not bother us here
|
|
*/
|
|
return !from_ext ||
|
|
(to_ext && from_ext &&
|
|
!memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
|
|
}
|
|
|
|
/* check if skbs can be collapsed.
|
|
* MPTCP collapse is allowed if neither @to or @from carry an mptcp data
|
|
* mapping, or if the extension of @to is the same as @from.
|
|
* Collapsing is not possible if @to lacks an extension, but @from carries one.
|
|
*/
|
|
static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
|
|
const struct sk_buff *from)
|
|
{
|
|
return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
|
|
skb_ext_find(from, SKB_EXT_MPTCP));
|
|
}
|
|
|
|
void mptcp_seq_show(struct seq_file *seq);
|
|
int mptcp_subflow_init_cookie_req(struct request_sock *req,
|
|
const struct sock *sk_listener,
|
|
struct sk_buff *skb);
|
|
|
|
__be32 mptcp_get_reset_option(const struct sk_buff *skb);
|
|
|
|
static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
|
|
{
|
|
if (skb_ext_exist(skb, SKB_EXT_MPTCP))
|
|
return mptcp_get_reset_option(skb);
|
|
|
|
return htonl(0u);
|
|
}
|
|
#else
|
|
|
|
static inline void mptcp_init(void)
|
|
{
|
|
}
|
|
|
|
static inline bool sk_is_mptcp(const struct sock *sk)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool rsk_is_mptcp(const struct request_sock *req)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool rsk_drop_req(const struct request_sock *req)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void mptcp_parse_option(const struct sk_buff *skb,
|
|
const unsigned char *ptr, int opsize,
|
|
struct tcp_options_received *opt_rx)
|
|
{
|
|
}
|
|
|
|
static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
|
|
unsigned int *size,
|
|
struct mptcp_out_options *opts)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool mptcp_synack_options(const struct request_sock *req,
|
|
unsigned int *size,
|
|
struct mptcp_out_options *opts)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool mptcp_established_options(struct sock *sk,
|
|
struct sk_buff *skb,
|
|
unsigned int *size,
|
|
unsigned int remaining,
|
|
struct mptcp_out_options *opts)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool mptcp_incoming_options(struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void mptcp_skb_ext_move(struct sk_buff *to,
|
|
const struct sk_buff *from)
|
|
{
|
|
}
|
|
|
|
static inline void mptcp_skb_ext_copy(struct sk_buff *to,
|
|
struct sk_buff *from)
|
|
{
|
|
}
|
|
|
|
static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
|
|
const struct sk_buff *from)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
|
|
static inline void mptcp_seq_show(struct seq_file *seq) { }
|
|
|
|
static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
|
|
const struct sock *sk_listener,
|
|
struct sk_buff *skb)
|
|
{
|
|
return 0; /* TCP fallback */
|
|
}
|
|
|
|
static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
|
|
#endif /* CONFIG_MPTCP */
|
|
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
int mptcpv6_init(void);
|
|
void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
|
|
#elif IS_ENABLED(CONFIG_IPV6)
|
|
static inline int mptcpv6_init(void) { return 0; }
|
|
static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
|
|
#endif
|
|
|
|
#endif /* __NET_MPTCP_H */
|