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kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
/*
* Kernel Connection Multiplexor
*
* Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*/
#ifndef __NET_KCM_H_
#define __NET_KCM_H_
#include <linux/skbuff.h>
#include <net/sock.h>
#include <uapi/linux/kcm.h>
extern unsigned int kcm_net_id;
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
#define KCM_STATS_ADD(stat, count) ((stat) += (count))
#define KCM_STATS_INCR(stat) ((stat)++)
struct kcm_psock_stats {
unsigned long long rx_msgs;
unsigned long long rx_bytes;
unsigned long long tx_msgs;
unsigned long long tx_bytes;
unsigned int rx_aborts;
unsigned int rx_mem_fail;
unsigned int rx_need_more_hdr;
kcm: Add memory limit for receive message construction Message assembly is performed on the TCP socket. This is logically equivalent of an application that performs a peek on the socket to find out how much memory is needed for a receive buffer. The receive socket buffer also provides the maximum message size which is checked. The receive algorithm is something like: 1) Receive the first skbuf for a message (or skbufs if multiple are needed to determine message length). 2) Check the message length against the number of bytes in the TCP receive queue (tcp_inq()). - If all the bytes of the message are in the queue (incluing the skbuf received), then proceed with message assembly (it should complete with the tcp_read_sock) - Else, mark the psock with the number of bytes needed to complete the message. 3) In TCP data ready function, if the psock indicates that we are waiting for the rest of the bytes of a messages, check the number of queued bytes against that. - If there are still not enough bytes for the message, just return - Else, clear the waiting bytes and proceed to receive the skbufs. The message should now be received in one tcp_read_sock Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:10 +08:00
unsigned int rx_msg_too_big;
kcm: Add receive message timeout This patch adds receive timeout for message assembly on the attached TCP sockets. The timeout is set when a new messages is started and the whole message has not been received by TCP (not in the receive queue). If the completely message is subsequently received the timer is cancelled, if the timer expires the RX side is aborted. The timeout value is taken from the socket timeout (SO_RCVTIMEO) that is set on a TCP socket (i.e. set by get sockopt before attaching a TCP socket to KCM. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:11 +08:00
unsigned int rx_msg_timeouts;
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
unsigned int rx_bad_hdr_len;
unsigned long long reserved;
unsigned long long unreserved;
unsigned int tx_aborts;
};
struct kcm_mux_stats {
unsigned long long rx_msgs;
unsigned long long rx_bytes;
unsigned long long tx_msgs;
unsigned long long tx_bytes;
unsigned int rx_ready_drops;
unsigned int tx_retries;
unsigned int psock_attach;
unsigned int psock_unattach_rsvd;
unsigned int psock_unattach;
};
struct kcm_stats {
unsigned long long rx_msgs;
unsigned long long rx_bytes;
unsigned long long tx_msgs;
unsigned long long tx_bytes;
};
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
struct kcm_tx_msg {
unsigned int sent;
unsigned int fragidx;
unsigned int frag_offset;
unsigned int msg_flags;
struct sk_buff *frag_skb;
struct sk_buff *last_skb;
};
struct kcm_rx_msg {
int full_len;
int accum_len;
int offset;
kcm: Add memory limit for receive message construction Message assembly is performed on the TCP socket. This is logically equivalent of an application that performs a peek on the socket to find out how much memory is needed for a receive buffer. The receive socket buffer also provides the maximum message size which is checked. The receive algorithm is something like: 1) Receive the first skbuf for a message (or skbufs if multiple are needed to determine message length). 2) Check the message length against the number of bytes in the TCP receive queue (tcp_inq()). - If all the bytes of the message are in the queue (incluing the skbuf received), then proceed with message assembly (it should complete with the tcp_read_sock) - Else, mark the psock with the number of bytes needed to complete the message. 3) In TCP data ready function, if the psock indicates that we are waiting for the rest of the bytes of a messages, check the number of queued bytes against that. - If there are still not enough bytes for the message, just return - Else, clear the waiting bytes and proceed to receive the skbufs. The message should now be received in one tcp_read_sock Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:10 +08:00
int early_eaten;
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
};
/* Socket structure for KCM client sockets */
struct kcm_sock {
struct sock sk;
struct kcm_mux *mux;
struct list_head kcm_sock_list;
int index;
u32 done : 1;
struct work_struct done_work;
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
struct kcm_stats stats;
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
/* Transmit */
struct kcm_psock *tx_psock;
struct work_struct tx_work;
struct list_head wait_psock_list;
struct sk_buff *seq_skb;
/* Don't use bit fields here, these are set under different locks */
bool tx_wait;
bool tx_wait_more;
/* Receive */
struct kcm_psock *rx_psock;
struct list_head wait_rx_list; /* KCMs waiting for receiving */
bool rx_wait;
u32 rx_disabled : 1;
};
struct bpf_prog;
/* Structure for an attached lower socket */
struct kcm_psock {
struct sock *sk;
struct kcm_mux *mux;
int index;
u32 tx_stopped : 1;
u32 rx_stopped : 1;
u32 done : 1;
u32 unattaching : 1;
void (*save_state_change)(struct sock *sk);
void (*save_data_ready)(struct sock *sk);
void (*save_write_space)(struct sock *sk);
struct list_head psock_list;
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
struct kcm_psock_stats stats;
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
/* Receive */
struct sk_buff *rx_skb_head;
struct sk_buff **rx_skb_nextp;
struct sk_buff *ready_rx_msg;
struct list_head psock_ready_list;
struct work_struct rx_work;
struct delayed_work rx_delayed_work;
struct bpf_prog *bpf_prog;
struct kcm_sock *rx_kcm;
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
unsigned long long saved_rx_bytes;
unsigned long long saved_rx_msgs;
kcm: Add receive message timeout This patch adds receive timeout for message assembly on the attached TCP sockets. The timeout is set when a new messages is started and the whole message has not been received by TCP (not in the receive queue). If the completely message is subsequently received the timer is cancelled, if the timer expires the RX side is aborted. The timeout value is taken from the socket timeout (SO_RCVTIMEO) that is set on a TCP socket (i.e. set by get sockopt before attaching a TCP socket to KCM. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:11 +08:00
struct timer_list rx_msg_timer;
kcm: Add memory limit for receive message construction Message assembly is performed on the TCP socket. This is logically equivalent of an application that performs a peek on the socket to find out how much memory is needed for a receive buffer. The receive socket buffer also provides the maximum message size which is checked. The receive algorithm is something like: 1) Receive the first skbuf for a message (or skbufs if multiple are needed to determine message length). 2) Check the message length against the number of bytes in the TCP receive queue (tcp_inq()). - If all the bytes of the message are in the queue (incluing the skbuf received), then proceed with message assembly (it should complete with the tcp_read_sock) - Else, mark the psock with the number of bytes needed to complete the message. 3) In TCP data ready function, if the psock indicates that we are waiting for the rest of the bytes of a messages, check the number of queued bytes against that. - If there are still not enough bytes for the message, just return - Else, clear the waiting bytes and proceed to receive the skbufs. The message should now be received in one tcp_read_sock Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:10 +08:00
unsigned int rx_need_bytes;
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
/* Transmit */
struct kcm_sock *tx_kcm;
struct list_head psock_avail_list;
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
unsigned long long saved_tx_bytes;
unsigned long long saved_tx_msgs;
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
};
/* Per net MUX list */
struct kcm_net {
struct mutex mutex;
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
struct kcm_psock_stats aggregate_psock_stats;
struct kcm_mux_stats aggregate_mux_stats;
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
struct list_head mux_list;
int count;
};
/* Structure for a MUX */
struct kcm_mux {
struct list_head kcm_mux_list;
struct rcu_head rcu;
struct kcm_net *knet;
struct list_head kcm_socks; /* All KCM sockets on MUX */
int kcm_socks_cnt; /* Total KCM socket count for MUX */
struct list_head psocks; /* List of all psocks on MUX */
int psocks_cnt; /* Total attached sockets */
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
struct kcm_mux_stats stats;
struct kcm_psock_stats aggregate_psock_stats;
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
/* Receive */
spinlock_t rx_lock ____cacheline_aligned_in_smp;
struct list_head kcm_rx_waiters; /* KCMs waiting for receiving */
struct list_head psocks_ready; /* List of psocks with a msg ready */
struct sk_buff_head rx_hold_queue;
/* Transmit */
spinlock_t lock ____cacheline_aligned_in_smp; /* TX and mux locking */
struct list_head psocks_avail; /* List of available psocks */
struct list_head kcm_tx_waiters; /* KCMs waiting for a TX psock */
};
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
#ifdef CONFIG_PROC_FS
int kcm_proc_init(void);
void kcm_proc_exit(void);
#else
kcm: mark helper functions inline The stub helper functions for the newly added kcm_proc_init/exit interfaces are defined as 'static' in a header file, which leads to build warnings for each file that includes them without calling them: include/net/kcm.h:183:12: error: 'kcm_proc_init' defined but not used [-Werror=unused-function] include/net/kcm.h:184:13: error: 'kcm_proc_exit' defined but not used [-Werror=unused-function] This marks the two functions as 'static inline' instead, which avoids the warnings and is obviously what was meant here. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: cd6e111bf5be ("kcm: Add statistics and proc interfaces") Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-11 02:31:12 +08:00
static inline int kcm_proc_init(void) { return 0; }
static inline void kcm_proc_exit(void) { }
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
#endif
static inline void aggregate_psock_stats(struct kcm_psock_stats *stats,
struct kcm_psock_stats *agg_stats)
{
/* Save psock statistics in the mux when psock is being unattached. */
#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)
SAVE_PSOCK_STATS(rx_msgs);
SAVE_PSOCK_STATS(rx_bytes);
SAVE_PSOCK_STATS(rx_aborts);
SAVE_PSOCK_STATS(rx_mem_fail);
SAVE_PSOCK_STATS(rx_need_more_hdr);
kcm: Add memory limit for receive message construction Message assembly is performed on the TCP socket. This is logically equivalent of an application that performs a peek on the socket to find out how much memory is needed for a receive buffer. The receive socket buffer also provides the maximum message size which is checked. The receive algorithm is something like: 1) Receive the first skbuf for a message (or skbufs if multiple are needed to determine message length). 2) Check the message length against the number of bytes in the TCP receive queue (tcp_inq()). - If all the bytes of the message are in the queue (incluing the skbuf received), then proceed with message assembly (it should complete with the tcp_read_sock) - Else, mark the psock with the number of bytes needed to complete the message. 3) In TCP data ready function, if the psock indicates that we are waiting for the rest of the bytes of a messages, check the number of queued bytes against that. - If there are still not enough bytes for the message, just return - Else, clear the waiting bytes and proceed to receive the skbufs. The message should now be received in one tcp_read_sock Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:10 +08:00
SAVE_PSOCK_STATS(rx_msg_too_big);
kcm: Add receive message timeout This patch adds receive timeout for message assembly on the attached TCP sockets. The timeout is set when a new messages is started and the whole message has not been received by TCP (not in the receive queue). If the completely message is subsequently received the timer is cancelled, if the timer expires the RX side is aborted. The timeout value is taken from the socket timeout (SO_RCVTIMEO) that is set on a TCP socket (i.e. set by get sockopt before attaching a TCP socket to KCM. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:11 +08:00
SAVE_PSOCK_STATS(rx_msg_timeouts);
kcm: Add statistics and proc interfaces This patch adds various counters for KCM. These include counters for messages and bytes received or sent, as well as counters for number of attached/unattached TCP sockets and other error or edge events. The statistics are exposed via a proc interface. /proc/net/kcm provides statistics per KCM socket and per psock (attached TCP sockets). /proc/net/kcm_stats provides aggregate statistics. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:07 +08:00
SAVE_PSOCK_STATS(rx_bad_hdr_len);
SAVE_PSOCK_STATS(tx_msgs);
SAVE_PSOCK_STATS(tx_bytes);
SAVE_PSOCK_STATS(reserved);
SAVE_PSOCK_STATS(unreserved);
SAVE_PSOCK_STATS(tx_aborts);
#undef SAVE_PSOCK_STATS
}
static inline void aggregate_mux_stats(struct kcm_mux_stats *stats,
struct kcm_mux_stats *agg_stats)
{
/* Save psock statistics in the mux when psock is being unattached. */
#define SAVE_MUX_STATS(_stat) (agg_stats->_stat += stats->_stat)
SAVE_MUX_STATS(rx_msgs);
SAVE_MUX_STATS(rx_bytes);
SAVE_MUX_STATS(tx_msgs);
SAVE_MUX_STATS(tx_bytes);
SAVE_MUX_STATS(rx_ready_drops);
SAVE_MUX_STATS(psock_attach);
SAVE_MUX_STATS(psock_unattach_rsvd);
SAVE_MUX_STATS(psock_unattach);
#undef SAVE_MUX_STATS
}
kcm: Kernel Connection Multiplexor module This module implements the Kernel Connection Multiplexor. Kernel Connection Multiplexor (KCM) is a facility that provides a message based interface over TCP for generic application protocols. With KCM an application can efficiently send and receive application protocol messages over TCP using datagram sockets. For more information see the included Documentation/networking/kcm.txt Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-08 06:11:06 +08:00
#endif /* __NET_KCM_H_ */