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npf.c revision 1.34 
      1 /*	$NetBSD: npf.c,v 1.34 2017/06/01 02:45:14 chs Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2009-2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This material is based upon work partially supported by The
      8  * NetBSD Foundation under a contract with Mindaugas Rasiukevicius.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * NPF main: dynamic load/initialisation and unload routines.
     34  */
     35 
     36 #ifdef _KERNEL
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: npf.c,v 1.34 2017/06/01 02:45:14 chs Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/types.h>
     42 
     43 #include <sys/conf.h>
     44 #include <sys/kmem.h>
     45 #include <sys/percpu.h>
     46 #endif
     47 
     48 #include "npf_impl.h"
     49 #include "npf_conn.h"
     50 
     51 __read_mostly static npf_t *	npf_kernel_ctx = NULL;
     52 
     53 __dso_public int
     54 npf_sysinit(unsigned nworkers)
     55 {
     56 	npf_bpf_sysinit();
     57 	npf_tableset_sysinit();
     58 	npf_nat_sysinit();
     59 	return npf_worker_sysinit(nworkers);
     60 }
     61 
     62 __dso_public void
     63 npf_sysfini(void)
     64 {
     65 	npf_worker_sysfini();
     66 	npf_nat_sysfini();
     67 	npf_tableset_sysfini();
     68 	npf_bpf_sysfini();
     69 }
     70 
     71 __dso_public npf_t *
     72 npf_create(int flags, const npf_mbufops_t *mbufops, const npf_ifops_t *ifops)
     73 {
     74 	npf_t *npf;
     75 
     76 	npf = kmem_zalloc(sizeof(npf_t), KM_SLEEP);
     77 	npf->qsbr = pserialize_create();
     78 	npf->stats_percpu = percpu_alloc(NPF_STATS_SIZE);
     79 	npf->mbufops = mbufops;
     80 
     81 	npf_ifmap_init(npf, ifops);
     82 	npf_conn_init(npf, flags);
     83 	npf_alg_init(npf);
     84 	npf_ext_init(npf);
     85 
     86 	/* Load an empty configuration. */
     87 	npf_config_init(npf);
     88 	return npf;
     89 }
     90 
     91 __dso_public void
     92 npf_destroy(npf_t *npf)
     93 {
     94 	/*
     95 	 * Destroy the current configuration.  Note: at this point all
     96 	 * handlers must be deactivated; we will drain any processing.
     97 	 */
     98 	npf_config_fini(npf);
     99 
    100 	/* Finally, safe to destroy the subsystems. */
    101 	npf_ext_fini(npf);
    102 	npf_alg_fini(npf);
    103 	npf_conn_fini(npf);
    104 	npf_ifmap_fini(npf);
    105 
    106 	pserialize_destroy(npf->qsbr);
    107 	percpu_free(npf->stats_percpu, NPF_STATS_SIZE);
    108 	kmem_free(npf, sizeof(npf_t));
    109 }
    110 
    111 __dso_public int
    112 npf_load(npf_t *npf, void *ref, npf_error_t *err)
    113 {
    114 	return npfctl_load(npf, 0, ref);
    115 }
    116 
    117 __dso_public void
    118 npf_gc(npf_t *npf)
    119 {
    120 	npf_conn_worker(npf);
    121 }
    122 
    123 __dso_public void
    124 npf_thread_register(npf_t *npf)
    125 {
    126 	pserialize_register(npf->qsbr);
    127 }
    128 
    129 void
    130 npf_setkernctx(npf_t *npf)
    131 {
    132 	npf_kernel_ctx = npf;
    133 }
    134 
    135 npf_t *
    136 npf_getkernctx(void)
    137 {
    138 	return npf_kernel_ctx;
    139 }
    140 
    141 /*
    142  * NPF statistics interface.
    143  */
    144 
    145 void
    146 npf_stats_inc(npf_t *npf, npf_stats_t st)
    147 {
    148 	uint64_t *stats = percpu_getref(npf->stats_percpu);
    149 	stats[st]++;
    150 	percpu_putref(npf->stats_percpu);
    151 }
    152 
    153 void
    154 npf_stats_dec(npf_t *npf, npf_stats_t st)
    155 {
    156 	uint64_t *stats = percpu_getref(npf->stats_percpu);
    157 	stats[st]--;
    158 	percpu_putref(npf->stats_percpu);
    159 }
    160 
    161 static void
    162 npf_stats_collect(void *mem, void *arg, struct cpu_info *ci)
    163 {
    164 	uint64_t *percpu_stats = mem, *full_stats = arg;
    165 
    166 	for (unsigned i = 0; i < NPF_STATS_COUNT; i++) {
    167 		full_stats[i] += percpu_stats[i];
    168 	}
    169 }
    170 
    171 /*
    172  * npf_stats: export collected statistics.
    173  */
    174 __dso_public void
    175 npf_stats(npf_t *npf, uint64_t *buf)
    176 {
    177 	memset(buf, 0, NPF_STATS_SIZE);
    178 	percpu_foreach(npf->stats_percpu, npf_stats_collect, buf);
    179 }
    180