14cf49a43SJulian Elischer 24cf49a43SJulian Elischer /* 34cf49a43SJulian Elischer * ng_tee.c 44cf49a43SJulian Elischer * 54cf49a43SJulian Elischer * Copyright (c) 1996-1999 Whistle Communications, Inc. 64cf49a43SJulian Elischer * All rights reserved. 74cf49a43SJulian Elischer * 84cf49a43SJulian Elischer * Subject to the following obligations and disclaimer of warranty, use and 94cf49a43SJulian Elischer * redistribution of this software, in source or object code forms, with or 104cf49a43SJulian Elischer * without modifications are expressly permitted by Whistle Communications; 114cf49a43SJulian Elischer * provided, however, that: 124cf49a43SJulian Elischer * 1. Any and all reproductions of the source or object code must include the 134cf49a43SJulian Elischer * copyright notice above and the following disclaimer of warranties; and 144cf49a43SJulian Elischer * 2. No rights are granted, in any manner or form, to use Whistle 154cf49a43SJulian Elischer * Communications, Inc. trademarks, including the mark "WHISTLE 164cf49a43SJulian Elischer * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 174cf49a43SJulian Elischer * such appears in the above copyright notice or in the software. 184cf49a43SJulian Elischer * 194cf49a43SJulian Elischer * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 204cf49a43SJulian Elischer * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 214cf49a43SJulian Elischer * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 224cf49a43SJulian Elischer * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 234cf49a43SJulian Elischer * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 244cf49a43SJulian Elischer * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 254cf49a43SJulian Elischer * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 264cf49a43SJulian Elischer * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 274cf49a43SJulian Elischer * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 284cf49a43SJulian Elischer * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 294cf49a43SJulian Elischer * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 304cf49a43SJulian Elischer * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 314cf49a43SJulian Elischer * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 324cf49a43SJulian Elischer * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 334cf49a43SJulian Elischer * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 344cf49a43SJulian Elischer * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 354cf49a43SJulian Elischer * OF SUCH DAMAGE. 364cf49a43SJulian Elischer * 37cc3bbd68SJulian Elischer * Author: Julian Elischer <julian@freebsd.org> 384cf49a43SJulian Elischer * 394cf49a43SJulian Elischer * $FreeBSD$ 4074f5c6aaSJulian Elischer * $Whistle: ng_tee.c,v 1.18 1999/11/01 09:24:52 julian Exp $ 414cf49a43SJulian Elischer */ 424cf49a43SJulian Elischer 434cf49a43SJulian Elischer /* 444cf49a43SJulian Elischer * This node is like the tee(1) command and is useful for ``snooping.'' 454cf49a43SJulian Elischer * It has 4 hooks: left, right, left2right, and right2left. Data 464cf49a43SJulian Elischer * entering from the right is passed to the left and duplicated on 474cf49a43SJulian Elischer * right2left, and data entering from the left is passed to the right 484cf49a43SJulian Elischer * and duplicated on left2right. Data entering from left2right is 49722a139cSJulian Elischer * sent to left, and data from right2left to right. 504cf49a43SJulian Elischer */ 514cf49a43SJulian Elischer 524cf49a43SJulian Elischer #include <sys/param.h> 534cf49a43SJulian Elischer #include <sys/systm.h> 544cf49a43SJulian Elischer #include <sys/errno.h> 554cf49a43SJulian Elischer #include <sys/kernel.h> 564cf49a43SJulian Elischer #include <sys/malloc.h> 574cf49a43SJulian Elischer #include <sys/mbuf.h> 584cf49a43SJulian Elischer #include <netgraph/ng_message.h> 594cf49a43SJulian Elischer #include <netgraph/netgraph.h> 605c63f81fSArchie Cobbs #include <netgraph/ng_parse.h> 614cf49a43SJulian Elischer #include <netgraph/ng_tee.h> 624cf49a43SJulian Elischer 634cf49a43SJulian Elischer /* Per hook info */ 644cf49a43SJulian Elischer struct hookinfo { 654cf49a43SJulian Elischer hook_p hook; 669cb887a6SArchie Cobbs struct ng_tee_hookstat stats; 674cf49a43SJulian Elischer }; 684cf49a43SJulian Elischer 694cf49a43SJulian Elischer /* Per node info */ 704cf49a43SJulian Elischer struct privdata { 714cf49a43SJulian Elischer node_p node; 724cf49a43SJulian Elischer struct hookinfo left; 734cf49a43SJulian Elischer struct hookinfo right; 744cf49a43SJulian Elischer struct hookinfo left2right; 754cf49a43SJulian Elischer struct hookinfo right2left; 764cf49a43SJulian Elischer }; 774cf49a43SJulian Elischer typedef struct privdata *sc_p; 784cf49a43SJulian Elischer 794cf49a43SJulian Elischer /* Netgraph methods */ 8074f5c6aaSJulian Elischer static ng_constructor_t ngt_constructor; 8174f5c6aaSJulian Elischer static ng_rcvmsg_t ngt_rcvmsg; 82069154d5SJulian Elischer static ng_shutdown_t ngt_shutdown; 8374f5c6aaSJulian Elischer static ng_newhook_t ngt_newhook; 8474f5c6aaSJulian Elischer static ng_rcvdata_t ngt_rcvdata; 8574f5c6aaSJulian Elischer static ng_disconnect_t ngt_disconnect; 864cf49a43SJulian Elischer 875c63f81fSArchie Cobbs /* Parse type for struct ng_tee_hookstat */ 88f0184ff8SArchie Cobbs static const struct ng_parse_struct_field ng_tee_hookstat_type_fields[] 89f0184ff8SArchie Cobbs = NG_TEE_HOOKSTAT_INFO; 905c63f81fSArchie Cobbs static const struct ng_parse_type ng_tee_hookstat_type = { 915c63f81fSArchie Cobbs &ng_parse_struct_type, 92f0184ff8SArchie Cobbs &ng_tee_hookstat_type_fields 935c63f81fSArchie Cobbs }; 945c63f81fSArchie Cobbs 955c63f81fSArchie Cobbs /* Parse type for struct ng_tee_stats */ 96f0184ff8SArchie Cobbs static const struct ng_parse_struct_field ng_tee_stats_type_fields[] 97f0184ff8SArchie Cobbs = NG_TEE_STATS_INFO(&ng_tee_hookstat_type); 985c63f81fSArchie Cobbs static const struct ng_parse_type ng_tee_stats_type = { 995c63f81fSArchie Cobbs &ng_parse_struct_type, 100f0184ff8SArchie Cobbs &ng_tee_stats_type_fields 1015c63f81fSArchie Cobbs }; 1025c63f81fSArchie Cobbs 1035c63f81fSArchie Cobbs /* List of commands and how to convert arguments to/from ASCII */ 1045c63f81fSArchie Cobbs static const struct ng_cmdlist ng_tee_cmds[] = { 1055c63f81fSArchie Cobbs { 1065c63f81fSArchie Cobbs NGM_TEE_COOKIE, 1075c63f81fSArchie Cobbs NGM_TEE_GET_STATS, 1085c63f81fSArchie Cobbs "getstats", 1095c63f81fSArchie Cobbs NULL, 1105c63f81fSArchie Cobbs &ng_tee_stats_type 1115c63f81fSArchie Cobbs }, 1125c63f81fSArchie Cobbs { 1135c63f81fSArchie Cobbs NGM_TEE_COOKIE, 1145c63f81fSArchie Cobbs NGM_TEE_CLR_STATS, 1155c63f81fSArchie Cobbs "clrstats", 1165c63f81fSArchie Cobbs NULL, 1175c63f81fSArchie Cobbs NULL 1185c63f81fSArchie Cobbs }, 11905215785SArchie Cobbs { 12005215785SArchie Cobbs NGM_TEE_COOKIE, 12105215785SArchie Cobbs NGM_TEE_GETCLR_STATS, 12205215785SArchie Cobbs "getclrstats", 12305215785SArchie Cobbs NULL, 12405215785SArchie Cobbs &ng_tee_stats_type 12505215785SArchie Cobbs }, 1265c63f81fSArchie Cobbs { 0 } 1275c63f81fSArchie Cobbs }; 1285c63f81fSArchie Cobbs 1294cf49a43SJulian Elischer /* Netgraph type descriptor */ 1305c63f81fSArchie Cobbs static struct ng_type ng_tee_typestruct = { 131f8aae777SJulian Elischer .version = NG_ABI_VERSION, 132f8aae777SJulian Elischer .name = NG_TEE_NODE_TYPE, 133f8aae777SJulian Elischer .constructor = ngt_constructor, 134f8aae777SJulian Elischer .rcvmsg = ngt_rcvmsg, 135f8aae777SJulian Elischer .shutdown = ngt_shutdown, 136f8aae777SJulian Elischer .newhook = ngt_newhook, 137f8aae777SJulian Elischer .rcvdata = ngt_rcvdata, 138f8aae777SJulian Elischer .disconnect = ngt_disconnect, 139f8aae777SJulian Elischer .cmdlist = ng_tee_cmds, 1404cf49a43SJulian Elischer }; 1415c63f81fSArchie Cobbs NETGRAPH_INIT(tee, &ng_tee_typestruct); 1424cf49a43SJulian Elischer 1434cf49a43SJulian Elischer /* 1444cf49a43SJulian Elischer * Node constructor 1454cf49a43SJulian Elischer */ 1464cf49a43SJulian Elischer static int 147069154d5SJulian Elischer ngt_constructor(node_p node) 1484cf49a43SJulian Elischer { 1494cf49a43SJulian Elischer sc_p privdata; 1504cf49a43SJulian Elischer 15199cdf4ccSDavid Malone MALLOC(privdata, sc_p, sizeof(*privdata), M_NETGRAPH, M_NOWAIT|M_ZERO); 1524cf49a43SJulian Elischer if (privdata == NULL) 1534cf49a43SJulian Elischer return (ENOMEM); 1544cf49a43SJulian Elischer 15530400f03SJulian Elischer NG_NODE_SET_PRIVATE(node, privdata); 156069154d5SJulian Elischer privdata->node = node; 1574cf49a43SJulian Elischer return (0); 1584cf49a43SJulian Elischer } 1594cf49a43SJulian Elischer 1604cf49a43SJulian Elischer /* 1614cf49a43SJulian Elischer * Add a hook 1624cf49a43SJulian Elischer */ 1634cf49a43SJulian Elischer static int 1644cf49a43SJulian Elischer ngt_newhook(node_p node, hook_p hook, const char *name) 1654cf49a43SJulian Elischer { 16630400f03SJulian Elischer const sc_p sc = NG_NODE_PRIVATE(node); 1674cf49a43SJulian Elischer 1684cf49a43SJulian Elischer if (strcmp(name, NG_TEE_HOOK_RIGHT) == 0) { 1694cf49a43SJulian Elischer sc->right.hook = hook; 1709cb887a6SArchie Cobbs bzero(&sc->right.stats, sizeof(sc->right.stats)); 17130400f03SJulian Elischer NG_HOOK_SET_PRIVATE(hook, &sc->right); 1724cf49a43SJulian Elischer } else if (strcmp(name, NG_TEE_HOOK_LEFT) == 0) { 1734cf49a43SJulian Elischer sc->left.hook = hook; 1749cb887a6SArchie Cobbs bzero(&sc->left.stats, sizeof(sc->left.stats)); 17530400f03SJulian Elischer NG_HOOK_SET_PRIVATE(hook, &sc->left); 1764cf49a43SJulian Elischer } else if (strcmp(name, NG_TEE_HOOK_RIGHT2LEFT) == 0) { 1774cf49a43SJulian Elischer sc->right2left.hook = hook; 1789cb887a6SArchie Cobbs bzero(&sc->right2left.stats, sizeof(sc->right2left.stats)); 17930400f03SJulian Elischer NG_HOOK_SET_PRIVATE(hook, &sc->right2left); 1804cf49a43SJulian Elischer } else if (strcmp(name, NG_TEE_HOOK_LEFT2RIGHT) == 0) { 1814cf49a43SJulian Elischer sc->left2right.hook = hook; 1829cb887a6SArchie Cobbs bzero(&sc->left2right.stats, sizeof(sc->left2right.stats)); 18330400f03SJulian Elischer NG_HOOK_SET_PRIVATE(hook, &sc->left2right); 1844cf49a43SJulian Elischer } else 1854cf49a43SJulian Elischer return (EINVAL); 1864cf49a43SJulian Elischer return (0); 1874cf49a43SJulian Elischer } 1884cf49a43SJulian Elischer 1894cf49a43SJulian Elischer /* 1909cb887a6SArchie Cobbs * Receive a control message 1914cf49a43SJulian Elischer */ 1924cf49a43SJulian Elischer static int 193069154d5SJulian Elischer ngt_rcvmsg(node_p node, item_p item, hook_p lasthook) 1944cf49a43SJulian Elischer { 19530400f03SJulian Elischer const sc_p sc = NG_NODE_PRIVATE(node); 1969cb887a6SArchie Cobbs struct ng_mesg *resp = NULL; 1979cb887a6SArchie Cobbs int error = 0; 198069154d5SJulian Elischer struct ng_mesg *msg; 1999cb887a6SArchie Cobbs 200069154d5SJulian Elischer NGI_GET_MSG(item, msg); 2019cb887a6SArchie Cobbs switch (msg->header.typecookie) { 2029cb887a6SArchie Cobbs case NGM_TEE_COOKIE: 2039cb887a6SArchie Cobbs switch (msg->header.cmd) { 2049cb887a6SArchie Cobbs case NGM_TEE_GET_STATS: 20505215785SArchie Cobbs case NGM_TEE_CLR_STATS: 20605215785SArchie Cobbs case NGM_TEE_GETCLR_STATS: 2079cb887a6SArchie Cobbs { 2089cb887a6SArchie Cobbs struct ng_tee_stats *stats; 2099cb887a6SArchie Cobbs 21005215785SArchie Cobbs if (msg->header.cmd != NGM_TEE_CLR_STATS) { 2119cb887a6SArchie Cobbs NG_MKRESPONSE(resp, msg, 21205215785SArchie Cobbs sizeof(*stats), M_NOWAIT); 2139cb887a6SArchie Cobbs if (resp == NULL) { 2149cb887a6SArchie Cobbs error = ENOMEM; 2159cb887a6SArchie Cobbs goto done; 2169cb887a6SArchie Cobbs } 2179cb887a6SArchie Cobbs stats = (struct ng_tee_stats *)resp->data; 21805215785SArchie Cobbs bcopy(&sc->right.stats, &stats->right, 21905215785SArchie Cobbs sizeof(stats->right)); 22005215785SArchie Cobbs bcopy(&sc->left.stats, &stats->left, 22105215785SArchie Cobbs sizeof(stats->left)); 22205215785SArchie Cobbs bcopy(&sc->right2left.stats, &stats->right2left, 22305215785SArchie Cobbs sizeof(stats->right2left)); 22405215785SArchie Cobbs bcopy(&sc->left2right.stats, &stats->left2right, 22505215785SArchie Cobbs sizeof(stats->left2right)); 2269cb887a6SArchie Cobbs } 22705215785SArchie Cobbs if (msg->header.cmd != NGM_TEE_GET_STATS) { 22805215785SArchie Cobbs bzero(&sc->right.stats, 22905215785SArchie Cobbs sizeof(sc->right.stats)); 23005215785SArchie Cobbs bzero(&sc->left.stats, 23105215785SArchie Cobbs sizeof(sc->left.stats)); 2329cb887a6SArchie Cobbs bzero(&sc->right2left.stats, 2339cb887a6SArchie Cobbs sizeof(sc->right2left.stats)); 2349cb887a6SArchie Cobbs bzero(&sc->left2right.stats, 2359cb887a6SArchie Cobbs sizeof(sc->left2right.stats)); 23605215785SArchie Cobbs } 2379cb887a6SArchie Cobbs break; 23805215785SArchie Cobbs } 2399cb887a6SArchie Cobbs default: 2409cb887a6SArchie Cobbs error = EINVAL; 2419cb887a6SArchie Cobbs break; 2429cb887a6SArchie Cobbs } 2439cb887a6SArchie Cobbs break; 244069154d5SJulian Elischer case NGM_FLOW_COOKIE: 245069154d5SJulian Elischer if (lasthook) { 246069154d5SJulian Elischer if (lasthook == sc->left.hook) { 247069154d5SJulian Elischer if (sc->right.hook) { 248069154d5SJulian Elischer NGI_MSG(item) = msg; 24930400f03SJulian Elischer NG_FWD_ITEM_HOOK(error, item, 25030400f03SJulian Elischer sc->right.hook); 251069154d5SJulian Elischer return (error); 252069154d5SJulian Elischer } 253069154d5SJulian Elischer } else { 254069154d5SJulian Elischer if (sc->left.hook) { 255069154d5SJulian Elischer NGI_MSG(item) = msg; 25630400f03SJulian Elischer NG_FWD_ITEM_HOOK(error, item, 25730400f03SJulian Elischer sc->left.hook); 258069154d5SJulian Elischer return (error); 259069154d5SJulian Elischer } 260069154d5SJulian Elischer } 261069154d5SJulian Elischer } 262069154d5SJulian Elischer break; 2639cb887a6SArchie Cobbs default: 2649cb887a6SArchie Cobbs error = EINVAL; 2659cb887a6SArchie Cobbs break; 2669cb887a6SArchie Cobbs } 2679cb887a6SArchie Cobbs done: 268069154d5SJulian Elischer NG_RESPOND_MSG(error, node, item, resp); 269069154d5SJulian Elischer NG_FREE_MSG(msg); 2709cb887a6SArchie Cobbs return (error); 2714cf49a43SJulian Elischer } 2724cf49a43SJulian Elischer 2734cf49a43SJulian Elischer /* 2744cf49a43SJulian Elischer * Receive data on a hook 2754cf49a43SJulian Elischer * 2764cf49a43SJulian Elischer * If data comes in the right link send a copy out right2left, and then 2774cf49a43SJulian Elischer * send the original onwards out through the left link. 2784cf49a43SJulian Elischer * Do the opposite for data coming in from the left link. 2794cf49a43SJulian Elischer * Data coming in right2left or left2right is forwarded 2804cf49a43SJulian Elischer * on through the appropriate destination hook as if it had come 2814cf49a43SJulian Elischer * from the other side. 2824cf49a43SJulian Elischer */ 2834cf49a43SJulian Elischer static int 284069154d5SJulian Elischer ngt_rcvdata(hook_p hook, item_p item) 2854cf49a43SJulian Elischer { 28630400f03SJulian Elischer const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 28730400f03SJulian Elischer struct hookinfo *const hinfo = NG_HOOK_PRIVATE(hook); 2884cf49a43SJulian Elischer struct hookinfo *dest; 2894cf49a43SJulian Elischer struct hookinfo *dup; 2904cf49a43SJulian Elischer int error = 0; 291069154d5SJulian Elischer struct mbuf *m; 292069154d5SJulian Elischer meta_p meta; 2934cf49a43SJulian Elischer 294069154d5SJulian Elischer m = NGI_M(item); 295069154d5SJulian Elischer meta = NGI_META(item); /* leave these owned by the item */ 2969cb887a6SArchie Cobbs /* Which hook? */ 2979cb887a6SArchie Cobbs if (hinfo == &sc->left) { 2984cf49a43SJulian Elischer dup = &sc->left2right; 2994cf49a43SJulian Elischer dest = &sc->right; 3009cb887a6SArchie Cobbs } else if (hinfo == &sc->right) { 3014cf49a43SJulian Elischer dup = &sc->right2left; 3024cf49a43SJulian Elischer dest = &sc->left; 3039cb887a6SArchie Cobbs } else if (hinfo == &sc->right2left) { 3044cf49a43SJulian Elischer dup = NULL; 3050633aaefSJulian Elischer dest = &sc->right; 3069cb887a6SArchie Cobbs } else if (hinfo == &sc->left2right) { 3074cf49a43SJulian Elischer dup = NULL; 3080633aaefSJulian Elischer dest = &sc->left; 309b40ce416SJulian Elischer } else { 3106e551fb6SDavid E. O'Brien panic("%s: no hook!", __func__); 311b40ce416SJulian Elischer #ifdef RESTARTABLE_PANICS 312b40ce416SJulian Elischer return(EINVAL); 313b40ce416SJulian Elischer #endif 314b40ce416SJulian Elischer } 3154cf49a43SJulian Elischer 3169cb887a6SArchie Cobbs /* Update stats on incoming hook */ 3179cb887a6SArchie Cobbs hinfo->stats.inOctets += m->m_pkthdr.len; 3189cb887a6SArchie Cobbs hinfo->stats.inFrames++; 3194cf49a43SJulian Elischer 320069154d5SJulian Elischer /* 321069154d5SJulian Elischer * Don't make a copy if only the dup hook exists. 322069154d5SJulian Elischer */ 323069154d5SJulian Elischer if ((dup && dup->hook) && (dest->hook == NULL)) { 324069154d5SJulian Elischer dest = dup; 325069154d5SJulian Elischer dup = NULL; 326069154d5SJulian Elischer } 327069154d5SJulian Elischer 3289cb887a6SArchie Cobbs /* Duplicate packet and meta info if requried */ 329ba9c6c61SJulian Elischer if (dup && dup->hook) { 3309cb887a6SArchie Cobbs struct mbuf *m2; 3319cb887a6SArchie Cobbs meta_p meta2; 3329cb887a6SArchie Cobbs 333069154d5SJulian Elischer /* Copy packet (failure will not stop the original)*/ 334a163d034SWarner Losh m2 = m_dup(m, M_DONTWAIT); 335069154d5SJulian Elischer if (m2) { 3369cb887a6SArchie Cobbs 3379cb887a6SArchie Cobbs /* Copy meta info */ 338069154d5SJulian Elischer /* If we can't get a copy, tough.. */ 3393a0d1d88SArchie Cobbs if (meta != NULL) { 340069154d5SJulian Elischer meta2 = ng_copy_meta(meta); 3413a0d1d88SArchie Cobbs } else 3423a0d1d88SArchie Cobbs meta2 = NULL; 3439cb887a6SArchie Cobbs 3449cb887a6SArchie Cobbs /* Deliver duplicate */ 3459cb887a6SArchie Cobbs dup->stats.outOctets += m->m_pkthdr.len; 3469cb887a6SArchie Cobbs dup->stats.outFrames++; 3479cb887a6SArchie Cobbs NG_SEND_DATA(error, dup->hook, m2, meta2); 3489cb887a6SArchie Cobbs } 349069154d5SJulian Elischer } 3509cb887a6SArchie Cobbs /* Deliver frame out destination hook */ 3510598ef01SJulian Elischer if (dest->hook) { 3529cb887a6SArchie Cobbs dest->stats.outOctets += m->m_pkthdr.len; 3539cb887a6SArchie Cobbs dest->stats.outFrames++; 35430400f03SJulian Elischer NG_FWD_ITEM_HOOK(error, item, dest->hook); 3550598ef01SJulian Elischer } else 356069154d5SJulian Elischer NG_FREE_ITEM(item); 35753dc6459SJulian Elischer return (error); 3584cf49a43SJulian Elischer } 3594cf49a43SJulian Elischer 3604cf49a43SJulian Elischer /* 3614cf49a43SJulian Elischer * Shutdown processing 3624cf49a43SJulian Elischer * 3634cf49a43SJulian Elischer * This is tricky. If we have both a left and right hook, then we 3644cf49a43SJulian Elischer * probably want to extricate ourselves and leave the two peers 3654cf49a43SJulian Elischer * still linked to each other. Otherwise we should just shut down as 3664cf49a43SJulian Elischer * a normal node would. 3674cf49a43SJulian Elischer * 3684cf49a43SJulian Elischer * To keep the scope of info correct the routine to "extract" a node 3694cf49a43SJulian Elischer * from two links is in ng_base.c. 3704cf49a43SJulian Elischer */ 3714cf49a43SJulian Elischer static int 372069154d5SJulian Elischer ngt_shutdown(node_p node) 3734cf49a43SJulian Elischer { 37430400f03SJulian Elischer const sc_p privdata = NG_NODE_PRIVATE(node); 3754cf49a43SJulian Elischer 376069154d5SJulian Elischer #if 0 /* can never happen as cutlinks is already called */ 3774cf49a43SJulian Elischer if (privdata->left.hook && privdata->right.hook) 3784cf49a43SJulian Elischer ng_bypass(privdata->left.hook, privdata->right.hook); 379069154d5SJulian Elischer #endif 38030400f03SJulian Elischer NG_NODE_SET_PRIVATE(node, NULL); 38130400f03SJulian Elischer NG_NODE_UNREF(privdata->node); 3824cf49a43SJulian Elischer FREE(privdata, M_NETGRAPH); 3834cf49a43SJulian Elischer return (0); 3844cf49a43SJulian Elischer } 3854cf49a43SJulian Elischer 3864cf49a43SJulian Elischer /* 3874cf49a43SJulian Elischer * Hook disconnection 3884cf49a43SJulian Elischer */ 3894cf49a43SJulian Elischer static int 3904cf49a43SJulian Elischer ngt_disconnect(hook_p hook) 3914cf49a43SJulian Elischer { 39230400f03SJulian Elischer struct hookinfo *const hinfo = NG_HOOK_PRIVATE(hook); 3934cf49a43SJulian Elischer 3946e551fb6SDavid E. O'Brien KASSERT(hinfo != NULL, ("%s: null info", __func__)); 3959cb887a6SArchie Cobbs hinfo->hook = NULL; 39630400f03SJulian Elischer if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 39730400f03SJulian Elischer && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 39830400f03SJulian Elischer ng_rmnode_self(NG_HOOK_NODE(hook)); 3994cf49a43SJulian Elischer return (0); 4004cf49a43SJulian Elischer } 4014cf49a43SJulian Elischer 402