npf.c revision 1.15
1 /* $NetBSD: npf.c,v 1.15 2013/02/09 03:35:31 rmind 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 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: npf.c,v 1.15 2013/02/09 03:35:31 rmind Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 42 #include <sys/atomic.h> 43 #include <sys/conf.h> 44 #include <sys/kauth.h> 45 #include <sys/kmem.h> 46 #include <sys/lwp.h> 47 #include <sys/module.h> 48 #include <sys/percpu.h> 49 #include <sys/rwlock.h> 50 #include <sys/socketvar.h> 51 #include <sys/sysctl.h> 52 #include <sys/uio.h> 53 54 #include "npf_impl.h" 55 56 /* 57 * Module and device structures. 58 */ 59 MODULE(MODULE_CLASS_DRIVER, npf, NULL); 60 61 void npfattach(int); 62 63 static int npf_fini(void); 64 static int npf_dev_open(dev_t, int, int, lwp_t *); 65 static int npf_dev_close(dev_t, int, int, lwp_t *); 66 static int npf_dev_ioctl(dev_t, u_long, void *, int, lwp_t *); 67 static int npf_dev_poll(dev_t, int, lwp_t *); 68 static int npf_dev_read(dev_t, struct uio *, int); 69 70 static int npfctl_stats(void *); 71 72 static percpu_t * npf_stats_percpu __read_mostly; 73 static struct sysctllog * npf_sysctl __read_mostly; 74 75 const struct cdevsw npf_cdevsw = { 76 npf_dev_open, npf_dev_close, npf_dev_read, nowrite, npf_dev_ioctl, 77 nostop, notty, npf_dev_poll, nommap, nokqfilter, D_OTHER | D_MPSAFE 78 }; 79 80 static int 81 npf_init(void) 82 { 83 #ifdef _MODULE 84 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 85 #endif 86 int error = 0; 87 88 npf_stats_percpu = percpu_alloc(NPF_STATS_SIZE); 89 npf_sysctl = NULL; 90 91 npf_tableset_sysinit(); 92 npf_session_sysinit(); 93 npf_nat_sysinit(); 94 npf_alg_sysinit(); 95 npf_ext_sysinit(); 96 97 /* Load empty configuration. */ 98 npf_config_init(); 99 100 #ifdef _MODULE 101 /* Attach /dev/npf device. */ 102 error = devsw_attach("npf", NULL, &bmajor, &npf_cdevsw, &cmajor); 103 if (error) { 104 /* It will call devsw_detach(), which is safe. */ 105 (void)npf_fini(); 106 } 107 #endif 108 return error; 109 } 110 111 static int 112 npf_fini(void) 113 { 114 115 /* At first, detach device and remove pfil hooks. */ 116 #ifdef _MODULE 117 devsw_detach(NULL, &npf_cdevsw); 118 #endif 119 npf_pfil_unregister(); 120 121 /* Flush all sessions, destroy configuration (ruleset, etc). */ 122 npf_session_tracking(false); 123 npf_config_fini(); 124 125 /* Finally, safe to destroy the subsystems. */ 126 npf_ext_sysfini(); 127 npf_alg_sysfini(); 128 npf_nat_sysfini(); 129 npf_session_sysfini(); 130 npf_tableset_sysfini(); 131 132 if (npf_sysctl) { 133 sysctl_teardown(&npf_sysctl); 134 } 135 percpu_free(npf_stats_percpu, NPF_STATS_SIZE); 136 137 return 0; 138 } 139 140 /* 141 * Module interface. 142 */ 143 static int 144 npf_modcmd(modcmd_t cmd, void *arg) 145 { 146 147 switch (cmd) { 148 case MODULE_CMD_INIT: 149 return npf_init(); 150 case MODULE_CMD_FINI: 151 return npf_fini(); 152 case MODULE_CMD_AUTOUNLOAD: 153 if (npf_autounload_p()) { 154 return EBUSY; 155 } 156 break; 157 default: 158 return ENOTTY; 159 } 160 return 0; 161 } 162 163 void 164 npfattach(int nunits) 165 { 166 167 /* Void. */ 168 } 169 170 static int 171 npf_dev_open(dev_t dev, int flag, int mode, lwp_t *l) 172 { 173 174 /* Available only for super-user. */ 175 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FIREWALL, 176 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, NULL, NULL)) { 177 return EPERM; 178 } 179 return 0; 180 } 181 182 static int 183 npf_dev_close(dev_t dev, int flag, int mode, lwp_t *l) 184 { 185 186 return 0; 187 } 188 189 static int 190 npf_dev_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 191 { 192 int error; 193 194 /* Available only for super-user. */ 195 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FIREWALL, 196 KAUTH_REQ_NETWORK_FIREWALL_FW, NULL, NULL, NULL)) { 197 return EPERM; 198 } 199 200 switch (cmd) { 201 case IOC_NPF_TABLE: 202 error = npfctl_table(data); 203 break; 204 case IOC_NPF_RULE: 205 error = npfctl_rule(cmd, data); 206 break; 207 case IOC_NPF_GETCONF: 208 error = npfctl_getconf(cmd, data); 209 break; 210 case IOC_NPF_STATS: 211 error = npfctl_stats(data); 212 break; 213 case IOC_NPF_SESSIONS_SAVE: 214 error = npfctl_sessions_save(cmd, data); 215 break; 216 case IOC_NPF_SESSIONS_LOAD: 217 error = npfctl_sessions_load(cmd, data); 218 break; 219 case IOC_NPF_SWITCH: 220 error = npfctl_switch(data); 221 break; 222 case IOC_NPF_RELOAD: 223 error = npfctl_reload(cmd, data); 224 break; 225 case IOC_NPF_VERSION: 226 *(int *)data = NPF_VERSION; 227 error = 0; 228 break; 229 default: 230 error = ENOTTY; 231 break; 232 } 233 return error; 234 } 235 236 static int 237 npf_dev_poll(dev_t dev, int events, lwp_t *l) 238 { 239 240 return ENOTSUP; 241 } 242 243 static int 244 npf_dev_read(dev_t dev, struct uio *uio, int flag) 245 { 246 247 return ENOTSUP; 248 } 249 250 bool 251 npf_autounload_p(void) 252 { 253 return !npf_pfil_registered_p() && npf_default_pass(); 254 } 255 256 /* 257 * NPF statistics interface. 258 */ 259 260 void 261 npf_stats_inc(npf_stats_t st) 262 { 263 uint64_t *stats = percpu_getref(npf_stats_percpu); 264 stats[st]++; 265 percpu_putref(npf_stats_percpu); 266 } 267 268 void 269 npf_stats_dec(npf_stats_t st) 270 { 271 uint64_t *stats = percpu_getref(npf_stats_percpu); 272 stats[st]--; 273 percpu_putref(npf_stats_percpu); 274 } 275 276 static void 277 npf_stats_collect(void *mem, void *arg, struct cpu_info *ci) 278 { 279 uint64_t *percpu_stats = mem, *full_stats = arg; 280 int i; 281 282 for (i = 0; i < NPF_STATS_COUNT; i++) { 283 full_stats[i] += percpu_stats[i]; 284 } 285 } 286 287 /* 288 * npfctl_stats: export collected statistics. 289 */ 290 static int 291 npfctl_stats(void *data) 292 { 293 uint64_t *fullst, *uptr = *(uint64_t **)data; 294 int error; 295 296 fullst = kmem_zalloc(NPF_STATS_SIZE, KM_SLEEP); 297 percpu_foreach(npf_stats_percpu, npf_stats_collect, fullst); 298 error = copyout(fullst, uptr, NPF_STATS_SIZE); 299 kmem_free(fullst, NPF_STATS_SIZE); 300 return error; 301 } 302
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