1 2 /* 3 * netgraph.h 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@freebsd.org> 38 * 39 * $FreeBSD: src/sys/netgraph/netgraph.h,v 1.6.2.7 2002/04/14 23:31:08 julian Exp $ 40 * $DragonFly: src/sys/netgraph/netgraph.h,v 1.2 2003/06/17 04:28:49 dillon Exp $ 41 * $Whistle: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $ 42 */ 43 44 #ifndef _NETGRAPH_NETGRAPH_H_ 45 #define _NETGRAPH_NETGRAPH_H_ 1 46 47 #include <sys/queue.h> 48 #include <sys/malloc.h> 49 #include <sys/module.h> 50 51 #ifndef _KERNEL 52 #error "This file should not be included in user level programs" 53 #endif 54 55 #define NG_ABI_VERSION NG_VERSION 56 57 /* 58 * Structure of a hook 59 */ 60 struct ng_hook { 61 char *name; /* what this node knows this link as */ 62 void *private; /* node dependant ID for this hook */ 63 int flags; /* info about this hook/link */ 64 int refs; /* dont actually free this till 0 */ 65 struct ng_hook *peer; /* the other end of this link */ 66 struct ng_node *node; /* The node this hook is attached to */ 67 LIST_ENTRY(ng_hook) hooks; /* linked list of all hooks on node */ 68 }; 69 typedef struct ng_hook *hook_p; 70 71 /* Flags for a hook */ 72 #define HK_INVALID 0x0001 /* don't trust it! */ 73 74 void ng_unref_hook(hook_p hook); /* don't move this */ 75 #define NG_HOOK_REF(hook) atomic_add_int(&(hook)->refs, 1) 76 #define NG_HOOK_NAME(hook) ((hook)->name) 77 #define NG_HOOK_UNREF(hook) ng_unref_hook(hook) 78 #define NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->private = val;} while (0) 79 #define NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->rcvmsg = val;} while (0) 80 #define NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->rcvdata = val;} while (0) 81 #define NG_HOOK_PRIVATE(hook) ((hook)->private) 82 #define NG_HOOK_NOT_VALID(hook) ((hook)->flags & HK_INVALID) 83 #define NG_HOOK_IS_VALID(hook) (!((hook)->flags & HK_INVALID)) 84 #define NG_HOOK_NODE(hook) ((hook)->node) /* only rvalue! */ 85 #define NG_HOOK_PEER(hook) ((hook)->peer) /* only rvalue! */ 86 87 /* Some shortcuts */ 88 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook)) 89 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook)) 90 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook)) 91 92 /* 93 * Structure of a node 94 */ 95 struct ng_node { 96 char *name; /* optional globally unique name */ 97 struct ng_type *type; /* the installed 'type' */ 98 int flags; /* see below for bit definitions */ 99 int sleepers; /* #procs sleeping on this node */ 100 int refs; /* number of references to this node */ 101 int numhooks; /* number of hooks */ 102 int colour; /* for graph colouring algorithms */ 103 void *private; /* node type dependant node ID */ 104 ng_ID_t ID; /* Unique per node */ 105 LIST_HEAD(hooks, ng_hook) hooks; /* linked list of node hooks */ 106 LIST_ENTRY(ng_node) nodes; /* linked list of all nodes */ 107 LIST_ENTRY(ng_node) idnodes; /* ID hash collision list */ 108 }; 109 typedef struct ng_node *node_p; 110 111 /* Flags for a node */ 112 #define NG_INVALID 0x001 /* free when all sleepers and refs go to 0 */ 113 #define NG_BUSY 0x002 /* callers should sleep or wait */ 114 #define NG_TOUCHED 0x004 /* to avoid cycles when 'flooding' */ 115 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */ 116 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */ 117 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */ 118 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */ 119 120 void ng_unref_node(node_p node); /* don't move this */ 121 #define NG_NODE_NAME(node) ((node)->name + 0) 122 #define NG_NODE_HAS_NAME(node) ((node)->name[0] + 0) 123 #define NG_NODE_ID(node) ((node)->ID + 0) 124 #define NG_NODE_REF(node) atomic_add_int(&(node)->refs, 1) 125 #define NG_NODE_UNREF(node) ng_unref(node) 126 #define NG_NODE_SET_PRIVATE(node, val) do {(node)->private = val;} while (0) 127 #define NG_NODE_PRIVATE(node) ((node)->private) 128 #define NG_NODE_IS_VALID(node) (!((node)->flags & NG_INVALID)) 129 #define NG_NODE_NOT_VALID(node) ((node)->flags & NG_INVALID) 130 #define NG_NODE_NUMHOOKS(node) ((node)->numhooks + 0) /* rvalue */ 131 132 /* 133 * The structure that holds meta_data about a data packet (e.g. priority) 134 * Nodes might add or subtract options as needed if there is room. 135 * They might reallocate the struct to make more room if they need to. 136 * Meta-data is still experimental. 137 */ 138 struct meta_field_header { 139 u_long cookie; /* cookie for the field. Skip fields you don't 140 * know about (same cookie as in messgaes) */ 141 u_short type; /* field ID */ 142 u_short len; /* total len of this field including extra 143 * data */ 144 char data[0]; /* data starts here */ 145 }; 146 147 /* To zero out an option 'in place' set it's cookie to this */ 148 #define NGM_INVALID_COOKIE 865455152 149 150 /* This part of the metadata is always present if the pointer is non NULL */ 151 struct ng_meta { 152 char priority; /* -ve is less priority, 0 is default */ 153 char discardability; /* higher is less valuable.. discard first */ 154 u_short allocated_len; /* amount malloc'd */ 155 u_short used_len; /* sum of all fields, options etc. */ 156 u_short flags; /* see below.. generic flags */ 157 struct meta_field_header options[0]; /* add as (if) needed */ 158 }; 159 typedef struct ng_meta *meta_p; 160 161 /* Flags for meta-data */ 162 #define NGMF_TEST 0x01 /* discard at the last moment before sending */ 163 #define NGMF_TRACE 0x02 /* trace when handing this data to a node */ 164 165 /* node method definitions */ 166 typedef int ng_constructor_t(node_p *node); 167 typedef int ng_rcvmsg_t(node_p node, struct ng_mesg *msg, 168 const char *retaddr, struct ng_mesg **resp); 169 typedef int ng_shutdown_t(node_p node); 170 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name); 171 typedef hook_p ng_findhook_t(node_p node, const char *name); 172 typedef int ng_connect_t(hook_p hook); 173 typedef int ng_rcvdata_t(hook_p hook, struct mbuf *m, meta_p meta); 174 typedef int ng_disconnect_t(hook_p hook); 175 176 /* 177 * Command list -- each node type specifies the command that it knows 178 * how to convert between ASCII and binary using an array of these. 179 * The last element in the array must be a terminator with cookie=0. 180 */ 181 182 struct ng_cmdlist { 183 u_int32_t cookie; /* command typecookie */ 184 int cmd; /* command number */ 185 const char *name; /* command name */ 186 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */ 187 const struct ng_parse_type *respType; /* args if NGF_RESP */ 188 }; 189 190 /* 191 * Structure of a node type 192 */ 193 struct ng_type { 194 195 u_int32_t version; /* must equal NG_VERSION */ 196 const char *name; /* Unique type name */ 197 modeventhand_t mod_event; /* Module event handler (optional) */ 198 ng_constructor_t *constructor; /* Node constructor */ 199 ng_rcvmsg_t *rcvmsg; /* control messages come here */ 200 ng_shutdown_t *shutdown; /* reset, and free resources */ 201 ng_newhook_t *newhook; /* first notification of new hook */ 202 ng_findhook_t *findhook; /* only if you have lots of hooks */ 203 ng_connect_t *connect; /* final notification of new hook */ 204 ng_rcvdata_t *rcvdata; /* date comes here */ 205 ng_rcvdata_t *rcvdataq; /* or here if being queued */ 206 ng_disconnect_t *disconnect; /* notify on disconnect */ 207 208 const struct ng_cmdlist *cmdlist; /* commands we can convert */ 209 210 /* R/W data private to the base netgraph code DON'T TOUCH! */ 211 LIST_ENTRY(ng_type) types; /* linked list of all types */ 212 int refs; /* number of instances */ 213 }; 214 215 /* Send data packet with meta-data */ 216 #define NG_SEND_DATA(error, hook, m, a) \ 217 do { \ 218 (error) = ng_send_data((hook), (m), (a)); \ 219 (m) = NULL; \ 220 (a) = NULL; \ 221 } while (0) 222 223 #define NG_SEND_DATA_ONLY(error, hook, m) \ 224 do { \ 225 (error) = ng_send_data((hook), (m), NULL); \ 226 (m) = NULL; \ 227 } while (0) 228 229 /* Send queued data packet with meta-data */ 230 #define NG_SEND_DATAQ(error, hook, m, a) \ 231 do { \ 232 (error) = ng_send_dataq((hook), (m), (a)); \ 233 (m) = NULL; \ 234 (a) = NULL; \ 235 } while (0) 236 237 #define NG_RESPOND_MSG(error, here, retaddr, resp, rptr) \ 238 do { \ 239 if (rptr) { \ 240 *rptr = resp; \ 241 } else if (resp) { \ 242 if (retaddr) { \ 243 error = ng_queue_msg(here, resp, retaddr); \ 244 } else { \ 245 FREE(resp, M_NETGRAPH); \ 246 } \ 247 } \ 248 } while (0) 249 250 #define NG_FREE_MSG(msg) \ 251 do { \ 252 if ((msg)) { \ 253 FREE((msg), M_NETGRAPH); \ 254 (msg) = NULL; \ 255 } \ 256 } while (0) 257 258 #define NG_FREE_META(a) \ 259 do { \ 260 if ((a)) { \ 261 FREE((a), M_NETGRAPH); \ 262 (a) = NULL; \ 263 } \ 264 } while (0) 265 266 #define NG_FREE_M(m) \ 267 do { \ 268 if ((m)) { \ 269 m_freem((m)); \ 270 (m) = NULL; \ 271 } \ 272 } while (0) 273 274 /* Free any data packet and/or meta-data */ 275 #define NG_FREE_DATA(m, a) \ 276 do { \ 277 NG_FREE_M((m)); \ 278 NG_FREE_META((a)); \ 279 } while (0) 280 281 /* 282 * Use the NETGRAPH_INIT() macro to link a node type into the 283 * netgraph system. This works for types compiled into the kernel 284 * as well as KLD modules. The first argument should be the type 285 * name (eg, echo) and the second a pointer to the type struct. 286 * 287 * If a different link time is desired, e.g., a device driver that 288 * needs to install its netgraph type before probing, use the 289 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably 290 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO. 291 */ 292 293 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \ 294 static moduledata_t ng_##typename##_mod = { \ 295 "ng_" #typename, \ 296 ng_mod_event, \ 297 (typestructp) \ 298 }; \ 299 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order) 300 301 #define NETGRAPH_INIT(tn, tp) \ 302 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY) 303 304 /* Special malloc() type for netgraph structs and ctrl messages */ 305 MALLOC_DECLARE(M_NETGRAPH); 306 307 /* declare the base of the netgraph sysctl hierarchy */ 308 /* but only if this file cares about sysctls */ 309 #ifdef SYSCTL_DECL 310 SYSCTL_DECL(_net_graph); 311 #endif 312 313 int ng_bypass(hook_p hook1, hook_p hook2); 314 void ng_cutlinks(node_p node); 315 int ng_con_nodes(node_p node, 316 const char *name, node_p node2, const char *name2); 317 meta_p ng_copy_meta(meta_p meta); 318 void ng_destroy_hook(hook_p hook); 319 hook_p ng_findhook(node_p node, const char *name); 320 node_p ng_findname(node_p node, const char *name); 321 struct ng_type *ng_findtype(const char *type); 322 int ng_make_node(const char *type, node_p *nodepp); 323 int ng_make_node_common(struct ng_type *typep, node_p *nodep); 324 int ng_mkpeer(node_p node, const char *name, const char *name2, char *type); 325 int ng_mod_event(module_t mod, int what, void *arg); 326 int ng_name_node(node_p node, const char *name); 327 int ng_newtype(struct ng_type *tp); 328 ng_ID_t ng_node2ID(node_p node); 329 int ng_path2node(node_p here, const char *path, node_p *dest, char **rtnp); 330 int ng_path_parse(char *addr, char **node, char **path, char **hook); 331 int ng_queue_data(hook_p hook, struct mbuf *m, meta_p meta); 332 int ng_queue_msg(node_p here, struct ng_mesg *msg, const char *address); 333 void ng_release_node(node_p node); 334 void ng_rmnode(node_p node); 335 int ng_send_data(hook_p hook, struct mbuf *m, meta_p meta); 336 int ng_send_dataq(hook_p hook, struct mbuf *m, meta_p meta); 337 int ng_send_msg(node_p here, struct ng_mesg *msg, 338 const char *address, struct ng_mesg **resp); 339 void ng_unname(node_p node); 340 void ng_unref(node_p node); 341 int ng_wait_node(node_p node, char *msg); 342 343 #endif /* _NETGRAPH_NETGRAPH_H_ */ 344 345