cregit-Linux how code gets into the kernel

Release 4.12 include/net/kcm.h

Directory: include/net
 * Kernel Connection Multiplexor
 * Copyright (c) 2016 Tom Herbert <>
 * 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 <net/strparser.h>
#include <uapi/linux/kcm.h>

extern unsigned int kcm_net_id;

#define KCM_STATS_ADD(stat, count) ((stat) += (count))

#define KCM_STATS_INCR(stat) ((stat)++)

struct kcm_psock_stats {
unsigned long long tx_msgs;
unsigned long long tx_bytes;
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;

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;

/* 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;

struct kcm_stats stats;

	/* Transmit */
struct kcm_psock *tx_psock;
struct work_struct tx_work;
struct list_head wait_psock_list;
struct sk_buff *seq_skb;
u32 tx_stopped : 1;

	/* 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 strparser strp;
struct kcm_mux *mux;
int index;

u32 tx_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;

struct kcm_psock_stats stats;

	/* Receive */
struct list_head psock_ready_list;
struct bpf_prog *bpf_prog;
struct kcm_sock *rx_kcm;
unsigned long long saved_rx_bytes;
unsigned long long saved_rx_msgs;
struct sk_buff *ready_rx_msg;

	/* Transmit */
struct kcm_sock *tx_kcm;
struct list_head psock_avail_list;
unsigned long long saved_tx_bytes;
unsigned long long saved_tx_msgs;

/* Per net MUX list */

struct kcm_net {
struct mutex mutex;
struct kcm_psock_stats aggregate_psock_stats;
struct kcm_mux_stats aggregate_mux_stats;
struct strp_aggr_stats aggregate_strp_stats;
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 */

struct kcm_mux_stats stats;
struct kcm_psock_stats aggregate_psock_stats;
struct strp_aggr_stats aggregate_strp_stats;

	/* 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 */

int kcm_proc_init(void);
void kcm_proc_exit(void);

static inline int kcm_proc_init(void) { return 0; }


Tom Herbert1191.67%150.00%
Arnd Bergmann18.33%150.00%

static inline void kcm_proc_exit(void) { }


Tom Herbert787.50%150.00%
Arnd Bergmann112.50%150.00%

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(tx_msgs); SAVE_PSOCK_STATS(tx_bytes); SAVE_PSOCK_STATS(reserved); SAVE_PSOCK_STATS(unreserved); SAVE_PSOCK_STATS(tx_aborts); #undef SAVE_PSOCK_STATS }


Tom Herbert53100.00%1100.00%

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 }


Tom Herbert68100.00%1100.00%

#endif /* __NET_KCM_H_ */

Overall Contributors

Tom Herbert66499.70%583.33%
Arnd Bergmann20.30%116.67%
Directory: include/net
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