Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/netgraph.h
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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 * $FreeBSD$ 40 * $Whistle: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $ 41 */ 42 43 #ifndef _NETGRAPH_NETGRAPH_H_ 44 #define _NETGRAPH_NETGRAPH_H_ 1 45 46 #include <sys/queue.h> 47 #include <sys/malloc.h> 48 #include <sys/module.h> 49 50 #ifndef KERNEL 51 #error "This file should not be included in user level programs" 52 #endif 53 54 /* 55 * Structure of a hook 56 */ 57 struct ng_hook { 58 char *name; /* what this node knows this link as */ 59 void *private; /* node dependant ID for this hook */ 60 int flags; /* info about this hook/link */ 61 int refs; /* dont actually free this till 0 */ 62 struct ng_hook *peer; /* the other end of this link */ 63 struct ng_node *node; /* The node this hook is attached to */ 64 LIST_ENTRY(ng_hook) hooks; /* linked list of all hooks on node */ 65 }; 66 typedef struct ng_hook *hook_p; 67 68 /* Flags for a hook */ 69 #define HK_INVALID 0x0001 /* don't trust it! */ 70 71 /* 72 * Structure of a node 73 */ 74 struct ng_node { 75 char *name; /* optional globally unique name */ 76 struct ng_type *type; /* the installed 'type' */ 77 int flags; /* see below for bit definitions */ 78 int sleepers; /* #procs sleeping on this node */ 79 int refs; /* number of references to this node */ 80 int numhooks; /* number of hooks */ 81 int colour; /* for graph colouring algorithms */ 82 void *private; /* node type dependant node ID */ 83 ng_ID_t ID; /* Unique per node */ 84 LIST_HEAD(hooks, ng_hook) hooks; /* linked list of node hooks */ 85 LIST_ENTRY(ng_node) nodes; /* linked list of all nodes */ 86 LIST_ENTRY(ng_node) idnodes; /* ID hash collision list */ 87 }; 88 typedef struct ng_node *node_p; 89 90 /* Flags for a node */ 91 #define NG_INVALID 0x001 /* free when all sleepers and refs go to 0 */ 92 #define NG_BUSY 0x002 /* callers should sleep or wait */ 93 #define NG_TOUCHED 0x004 /* to avoid cycles when 'flooding' */ 94 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */ 95 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */ 96 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */ 97 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */ 98 99 /* 100 * The structure that holds meta_data about a data packet (e.g. priority) 101 * Nodes might add or subtract options as needed if there is room. 102 * They might reallocate the struct to make more room if they need to. 103 * Meta-data is still experimental. 104 */ 105 struct meta_field_header { 106 u_long cookie; /* cookie for the field. Skip fields you don't 107 * know about (same cookie as in messgaes) */ 108 u_short type; /* field ID */ 109 u_short len; /* total len of this field including extra 110 * data */ 111 char data[0]; /* data starts here */ 112 }; 113 114 /* To zero out an option 'in place' set it's cookie to this */ 115 #define NGM_INVALID_COOKIE 865455152 116 117 /* This part of the metadata is always present if the pointer is non NULL */ 118 struct ng_meta { 119 char priority; /* -ve is less priority, 0 is default */ 120 char discardability; /* higher is less valuable.. discard first */ 121 u_short allocated_len; /* amount malloc'd */ 122 u_short used_len; /* sum of all fields, options etc. */ 123 u_short flags; /* see below.. generic flags */ 124 struct meta_field_header options[0]; /* add as (if) needed */ 125 }; 126 typedef struct ng_meta *meta_p; 127 128 /* Flags for meta-data */ 129 #define NGMF_TEST 0x01 /* discard at the last moment before sending */ 130 #define NGMF_TRACE 0x02 /* trace when handing this data to a node */ 131 132 /* node method definitions */ 133 typedef int ng_constructor_t(node_p *node); 134 typedef int ng_rcvmsg_t(node_p node, struct ng_mesg *msg, 135 const char *retaddr, struct ng_mesg **resp); 136 typedef int ng_shutdown_t(node_p node); 137 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name); 138 typedef hook_p ng_findhook_t(node_p node, const char *name); 139 typedef int ng_connect_t(hook_p hook); 140 typedef int ng_rcvdata_t(hook_p hook, struct mbuf *m, meta_p meta); 141 typedef int ng_disconnect_t(hook_p hook); 142 143 /* 144 * Command list -- each node type specifies the command that it knows 145 * how to convert between ASCII and binary using an array of these. 146 * The last element in the array must be a terminator with cookie=0. 147 */ 148 149 struct ng_cmdlist { 150 u_int32_t cookie; /* command typecookie */ 151 int cmd; /* command number */ 152 const char *name; /* command name */ 153 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */ 154 const struct ng_parse_type *respType; /* args if NGF_RESP */ 155 }; 156 157 /* 158 * Structure of a node type 159 */ 160 struct ng_type { 161 162 u_int32_t version; /* must equal NG_VERSION */ 163 const char *name; /* Unique type name */ 164 modeventhand_t mod_event; /* Module event handler (optional) */ 165 ng_constructor_t *constructor; /* Node constructor */ 166 ng_rcvmsg_t *rcvmsg; /* control messages come here */ 167 ng_shutdown_t *shutdown; /* reset, and free resources */ 168 ng_newhook_t *newhook; /* first notification of new hook */ 169 ng_findhook_t *findhook; /* only if you have lots of hooks */ 170 ng_connect_t *connect; /* final notification of new hook */ 171 ng_rcvdata_t *rcvdata; /* date comes here */ 172 ng_rcvdata_t *rcvdataq; /* or here if being queued */ 173 ng_disconnect_t *disconnect; /* notify on disconnect */ 174 175 const struct ng_cmdlist *cmdlist; /* commands we can convert */ 176 177 /* R/W data private to the base netgraph code DON'T TOUCH! */ 178 LIST_ENTRY(ng_type) types; /* linked list of all types */ 179 int refs; /* number of instances */ 180 }; 181 182 /* Send data packet with meta-data */ 183 #define NG_SEND_DATA(error, hook, m, a) \ 184 do { \ 185 (error) = ng_send_data((hook), (m), (a)); \ 186 (m) = NULL; \ 187 (a) = NULL; \ 188 } while (0) 189 190 /* Send queued data packet with meta-data */ 191 #define NG_SEND_DATAQ(error, hook, m, a) \ 192 do { \ 193 (error) = ng_send_dataq((hook), (m), (a)); \ 194 (m) = NULL; \ 195 (a) = NULL; \ 196 } while (0) 197 198 /* Free metadata */ 199 #define NG_FREE_META(a) \ 200 do { \ 201 if ((a)) { \ 202 FREE((a), M_NETGRAPH); \ 203 a = NULL; \ 204 } \ 205 } while (0) 206 207 /* Free any data packet and/or meta-data */ 208 #define NG_FREE_DATA(m, a) \ 209 do { \ 210 if ((m)) { \ 211 m_freem((m)); \ 212 m = NULL; \ 213 } \ 214 NG_FREE_META((a)); \ 215 } while (0) 216 217 /* 218 * Use the NETGRAPH_INIT() macro to link a node type into the 219 * netgraph system. This works for types compiled into the kernel 220 * as well as KLD modules. The first argument should be the type 221 * name (eg, echo) and the second a pointer to the type struct. 222 * 223 * If a different link time is desired, e.g., a device driver that 224 * needs to install its netgraph type before probing, use the 225 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably 226 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO. 227 */ 228 229 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \ 230 static moduledata_t ng_##typename##_mod = { \ 231 "ng_" #typename, \ 232 ng_mod_event, \ 233 (typestructp) \ 234 }; \ 235 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order) 236 237 #define NETGRAPH_INIT(tn, tp) \ 238 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY) 239 240 /* Special malloc() type for netgraph structs and ctrl messages */ 241 MALLOC_DECLARE(M_NETGRAPH); 242 243 int ng_bypass(hook_p hook1, hook_p hook2); 244 void ng_cutlinks(node_p node); 245 int ng_con_nodes(node_p node, 246 const char *name, node_p node2, const char *name2); 247 meta_p ng_copy_meta(meta_p meta); 248 void ng_destroy_hook(hook_p hook); 249 hook_p ng_findhook(node_p node, const char *name); 250 node_p ng_findname(node_p node, const char *name); 251 struct ng_type *ng_findtype(const char *type); 252 int ng_make_node(const char *type, node_p *nodepp); 253 int ng_make_node_common(struct ng_type *typep, node_p *nodep); 254 int ng_mkpeer(node_p node, const char *name, const char *name2, char *type); 255 int ng_mod_event(module_t mod, int what, void *arg); 256 int ng_name_node(node_p node, const char *name); 257 int ng_newtype(struct ng_type *tp); 258 ng_ID_t ng_node2ID(node_p node); 259 int ng_path2node(node_p here, const char *path, node_p *dest, char **rtnp); 260 int ng_path_parse(char *addr, char **node, char **path, char **hook); 261 int ng_queue_data(hook_p hook, struct mbuf *m, meta_p meta); 262 int ng_queue_msg(node_p here, struct ng_mesg *msg, const char *address); 263 void ng_release_node(node_p node); 264 void ng_rmnode(node_p node); 265 int ng_send_data(hook_p hook, struct mbuf *m, meta_p meta); 266 int ng_send_dataq(hook_p hook, struct mbuf *m, meta_p meta); 267 int ng_send_msg(node_p here, struct ng_mesg *msg, 268 const char *address, struct ng_mesg **resp); 269 void ng_unname(node_p node); 270 void ng_unref(node_p node); 271 int ng_wait_node(node_p node, char *msg); 272 273 #endif /* _NETGRAPH_NETGRAPH_H_ */ 274
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