include/net/kcm.h

   1 /*
   2  * Kernel Connection Multiplexor
   3  *
   4  * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  */
  10
  11 #ifndef __NET_KCM_H_
  12 #define __NET_KCM_H_
  13
  14 #include <linux/skbuff.h>
  15 #include <net/sock.h>
  16 #include <net/strparser.h>
  17 #include <uapi/linux/kcm.h>
  18
  19 extern unsigned int kcm_net_id;
  20
  21 #define KCM_STATS_ADD(stat, count) ((stat) += (count))
  22 #define KCM_STATS_INCR(stat) ((stat)++)
  23
  24 struct kcm_psock_stats {
  25         unsigned long long tx_msgs;
  26         unsigned long long tx_bytes;
  27         unsigned long long reserved;
  28         unsigned long long unreserved;
  29         unsigned int tx_aborts;
  30 };
  31
  32 struct kcm_mux_stats {
  33         unsigned long long rx_msgs;
  34         unsigned long long rx_bytes;
  35         unsigned long long tx_msgs;
  36         unsigned long long tx_bytes;
  37         unsigned int rx_ready_drops;
  38         unsigned int tx_retries;
  39         unsigned int psock_attach;
  40         unsigned int psock_unattach_rsvd;
  41         unsigned int psock_unattach;
  42 };
  43
  44 struct kcm_stats {
  45         unsigned long long rx_msgs;
  46         unsigned long long rx_bytes;
  47         unsigned long long tx_msgs;
  48         unsigned long long tx_bytes;
  49 };
  50
  51 struct kcm_tx_msg {
  52         unsigned int sent;
  53         unsigned int fragidx;
  54         unsigned int frag_offset;
  55         unsigned int msg_flags;
  56         struct sk_buff *frag_skb;
  57         struct sk_buff *last_skb;
  58 };
  59
  60 /* Socket structure for KCM client sockets */
  61 struct kcm_sock {
  62         struct sock sk;
  63         struct kcm_mux *mux;
  64         struct list_head kcm_sock_list;
  65         int index;
  66         u32 done : 1;
  67         struct work_struct done_work;
  68
  69         struct kcm_stats stats;
  70
  71         /* Transmit */
  72         struct kcm_psock *tx_psock;
  73         struct work_struct tx_work;
  74         struct list_head wait_psock_list;
  75         struct sk_buff *seq_skb;
  76         u32 tx_stopped : 1;
  77
  78         /* Don't use bit fields here, these are set under different locks */
  79         bool tx_wait;
  80         bool tx_wait_more;
  81
  82         /* Receive */
  83         struct kcm_psock *rx_psock;
  84         struct list_head wait_rx_list; /* KCMs waiting for receiving */
  85         bool rx_wait;
  86         u32 rx_disabled : 1;
  87 };
  88
  89 struct bpf_prog;
  90
  91 /* Structure for an attached lower socket */
  92 struct kcm_psock {
  93         struct sock *sk;
  94         struct strparser strp;
  95         struct kcm_mux *mux;
  96         int index;
  97
  98         u32 tx_stopped : 1;
  99         u32 done : 1;
 100         u32 unattaching : 1;
 101
 102         void (*save_state_change)(struct sock *sk);
 103         void (*save_data_ready)(struct sock *sk);
 104         void (*save_write_space)(struct sock *sk);
 105
 106         struct list_head psock_list;
 107
 108         struct kcm_psock_stats stats;
 109
 110         /* Receive */
 111         struct list_head psock_ready_list;
 112         struct bpf_prog *bpf_prog;
 113         struct kcm_sock *rx_kcm;
 114         unsigned long long saved_rx_bytes;
 115         unsigned long long saved_rx_msgs;
 116         struct sk_buff *ready_rx_msg;
 117
 118         /* Transmit */
 119         struct kcm_sock *tx_kcm;
 120         struct list_head psock_avail_list;
 121         unsigned long long saved_tx_bytes;
 122         unsigned long long saved_tx_msgs;
 123 };
 124
 125 /* Per net MUX list */
 126 struct kcm_net {
 127         struct mutex mutex;
 128         struct kcm_psock_stats aggregate_psock_stats;
 129         struct kcm_mux_stats aggregate_mux_stats;
 130         struct strp_aggr_stats aggregate_strp_stats;
 131         struct list_head mux_list;
 132         int count;
 133 };
 134
 135 /* Structure for a MUX */
 136 struct kcm_mux {
 137         struct list_head kcm_mux_list;
 138         struct rcu_head rcu;
 139         struct kcm_net *knet;
 140
 141         struct list_head kcm_socks;     /* All KCM sockets on MUX */
 142         int kcm_socks_cnt;              /* Total KCM socket count for MUX */
 143         struct list_head psocks;        /* List of all psocks on MUX */
 144         int psocks_cnt;         /* Total attached sockets */
 145
 146         struct kcm_mux_stats stats;
 147         struct kcm_psock_stats aggregate_psock_stats;
 148         struct strp_aggr_stats aggregate_strp_stats;
 149
 150         /* Receive */
 151         spinlock_t rx_lock ____cacheline_aligned_in_smp;
 152         struct list_head kcm_rx_waiters; /* KCMs waiting for receiving */
 153         struct list_head psocks_ready;  /* List of psocks with a msg ready */
 154         struct sk_buff_head rx_hold_queue;
 155
 156         /* Transmit */
 157         spinlock_t  lock ____cacheline_aligned_in_smp;  /* TX and mux locking */
 158         struct list_head psocks_avail;  /* List of available psocks */
 159         struct list_head kcm_tx_waiters; /* KCMs waiting for a TX psock */
 160 };
 161
 162 #ifdef CONFIG_PROC_FS
 163 int kcm_proc_init(void);
 164 void kcm_proc_exit(void);
 165 #else
 166 static inline int kcm_proc_init(void) { return 0; }
 167 static inline void kcm_proc_exit(void) { }
 168 #endif
 169
 170 static inline void aggregate_psock_stats(struct kcm_psock_stats *stats,
 171                                          struct kcm_psock_stats *agg_stats)
 172 {
 173         /* Save psock statistics in the mux when psock is being unattached. */
 174
 175 #define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)
 176         SAVE_PSOCK_STATS(tx_msgs);
 177         SAVE_PSOCK_STATS(tx_bytes);
 178         SAVE_PSOCK_STATS(reserved);
 179         SAVE_PSOCK_STATS(unreserved);
 180         SAVE_PSOCK_STATS(tx_aborts);
 181 #undef SAVE_PSOCK_STATS
 182 }
 183
 184 static inline void aggregate_mux_stats(struct kcm_mux_stats *stats,
 185                                        struct kcm_mux_stats *agg_stats)
 186 {
 187         /* Save psock statistics in the mux when psock is being unattached. */
 188
 189 #define SAVE_MUX_STATS(_stat) (agg_stats->_stat += stats->_stat)
 190         SAVE_MUX_STATS(rx_msgs);
 191         SAVE_MUX_STATS(rx_bytes);
 192         SAVE_MUX_STATS(tx_msgs);
 193         SAVE_MUX_STATS(tx_bytes);
 194         SAVE_MUX_STATS(rx_ready_drops);
 195         SAVE_MUX_STATS(psock_attach);
 196         SAVE_MUX_STATS(psock_unattach_rsvd);
 197         SAVE_MUX_STATS(psock_unattach);
 198 #undef SAVE_MUX_STATS
 199 }
 200
 201 #endif /* __NET_KCM_H_ */