/* * ng_tee.c */ /*- * Copyright (c) 1996-1999 Whistle Communications, Inc. * All rights reserved. * * Subject to the following obligations and disclaimer of warranty, use and * redistribution of this software, in source or object code forms, with or * without modifications are expressly permitted by Whistle Communications; * provided, however, that: * 1. Any and all reproductions of the source or object code must include the * copyright notice above and the following disclaimer of warranties; and * 2. No rights are granted, in any manner or form, to use Whistle * Communications, Inc. trademarks, including the mark "WHISTLE * COMMUNICATIONS" on advertising, endorsements, or otherwise except as * such appears in the above copyright notice or in the software. * * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * Author: Julian Elischer * * $FreeBSD$ * $Whistle: ng_tee.c,v 1.18 1999/11/01 09:24:52 julian Exp $ */ /* * This node is like the tee(1) command and is useful for ``snooping.'' * It has 4 hooks: left, right, left2right, and right2left. Data * entering from the right is passed to the left and duplicated on * right2left, and data entering from the left is passed to the right * and duplicated on left2right. Data entering from left2right is * sent to left, and data from right2left to right. */ #include #include #include #include #include #include #include #include #include #include /* Per hook info */ struct hookinfo { hook_p hook; struct hookinfo *dest, *dup; struct ng_tee_hookstat stats; }; typedef struct hookinfo *hi_p; /* Per node info */ struct privdata { struct hookinfo left; struct hookinfo right; struct hookinfo left2right; struct hookinfo right2left; }; typedef struct privdata *sc_p; /* Netgraph methods */ static ng_constructor_t ng_tee_constructor; static ng_rcvmsg_t ng_tee_rcvmsg; static ng_close_t ng_tee_close; static ng_shutdown_t ng_tee_shutdown; static ng_newhook_t ng_tee_newhook; static ng_rcvdata_t ng_tee_rcvdata; static ng_disconnect_t ng_tee_disconnect; /* Parse type for struct ng_tee_hookstat */ static const struct ng_parse_struct_field ng_tee_hookstat_type_fields[] = NG_TEE_HOOKSTAT_INFO; static const struct ng_parse_type ng_tee_hookstat_type = { &ng_parse_struct_type, &ng_tee_hookstat_type_fields }; /* Parse type for struct ng_tee_stats */ static const struct ng_parse_struct_field ng_tee_stats_type_fields[] = NG_TEE_STATS_INFO(&ng_tee_hookstat_type); static const struct ng_parse_type ng_tee_stats_type = { &ng_parse_struct_type, &ng_tee_stats_type_fields }; /* List of commands and how to convert arguments to/from ASCII */ static const struct ng_cmdlist ng_tee_cmds[] = { { NGM_TEE_COOKIE, NGM_TEE_GET_STATS, "getstats", NULL, &ng_tee_stats_type }, { NGM_TEE_COOKIE, NGM_TEE_CLR_STATS, "clrstats", NULL, NULL }, { NGM_TEE_COOKIE, NGM_TEE_GETCLR_STATS, "getclrstats", NULL, &ng_tee_stats_type }, { 0 } }; /* Netgraph type descriptor */ static struct ng_type ng_tee_typestruct = { .version = NG_ABI_VERSION, .name = NG_TEE_NODE_TYPE, .constructor = ng_tee_constructor, .rcvmsg = ng_tee_rcvmsg, .close = ng_tee_close, .shutdown = ng_tee_shutdown, .newhook = ng_tee_newhook, .rcvdata = ng_tee_rcvdata, .disconnect = ng_tee_disconnect, .cmdlist = ng_tee_cmds, }; NETGRAPH_INIT(tee, &ng_tee_typestruct); /* * Node constructor */ static int ng_tee_constructor(node_p node) { sc_p privdata; privdata = malloc(sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO); NG_NODE_SET_PRIVATE(node, privdata); return (0); } /* * Add a hook */ static int ng_tee_newhook(node_p node, hook_p hook, const char *name) { sc_p privdata = NG_NODE_PRIVATE(node); hi_p hinfo; /* Precalculate internal pathes. */ if (strcmp(name, NG_TEE_HOOK_RIGHT) == 0) { hinfo = &privdata->right; if (privdata->left.dest) privdata->left.dup = privdata->left.dest; privdata->left.dest = hinfo; privdata->right2left.dest = hinfo; } else if (strcmp(name, NG_TEE_HOOK_LEFT) == 0) { hinfo = &privdata->left; if (privdata->right.dest) privdata->right.dup = privdata->right.dest; privdata->right.dest = hinfo; privdata->left2right.dest = hinfo; } else if (strcmp(name, NG_TEE_HOOK_RIGHT2LEFT) == 0) { hinfo = &privdata->right2left; if (privdata->right.dest) privdata->right.dup = hinfo; else privdata->right.dest = hinfo; } else if (strcmp(name, NG_TEE_HOOK_LEFT2RIGHT) == 0) { hinfo = &privdata->left2right; if (privdata->left.dest) privdata->left.dup = hinfo; else privdata->left.dest = hinfo; } else return (EINVAL); hinfo->hook = hook; bzero(&hinfo->stats, sizeof(hinfo->stats)); NG_HOOK_SET_PRIVATE(hook, hinfo); return (0); } /* * Receive a control message */ static int ng_tee_rcvmsg(node_p node, item_p item, hook_p lasthook) { const sc_p sc = NG_NODE_PRIVATE(node); struct ng_mesg *resp = NULL; int error = 0; struct ng_mesg *msg; NGI_GET_MSG(item, msg); switch (msg->header.typecookie) { case NGM_TEE_COOKIE: switch (msg->header.cmd) { case NGM_TEE_GET_STATS: case NGM_TEE_CLR_STATS: case NGM_TEE_GETCLR_STATS: { struct ng_tee_stats *stats; if (msg->header.cmd != NGM_TEE_CLR_STATS) { NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); if (resp == NULL) { error = ENOMEM; goto done; } stats = (struct ng_tee_stats *)resp->data; bcopy(&sc->right.stats, &stats->right, sizeof(stats->right)); bcopy(&sc->left.stats, &stats->left, sizeof(stats->left)); bcopy(&sc->right2left.stats, &stats->right2left, sizeof(stats->right2left)); bcopy(&sc->left2right.stats, &stats->left2right, sizeof(stats->left2right)); } if (msg->header.cmd != NGM_TEE_GET_STATS) { bzero(&sc->right.stats, sizeof(sc->right.stats)); bzero(&sc->left.stats, sizeof(sc->left.stats)); bzero(&sc->right2left.stats, sizeof(sc->right2left.stats)); bzero(&sc->left2right.stats, sizeof(sc->left2right.stats)); } break; } default: error = EINVAL; break; } break; case NGM_FLOW_COOKIE: if (lasthook == sc->left.hook || lasthook == sc->right.hook) { hi_p const hinfo = NG_HOOK_PRIVATE(lasthook); if (hinfo && hinfo->dest) { NGI_MSG(item) = msg; NG_FWD_ITEM_HOOK(error, item, hinfo->dest->hook); return (error); } } break; default: error = EINVAL; break; } done: NG_RESPOND_MSG(error, node, item, resp); NG_FREE_MSG(msg); return (error); } /* * Receive data on a hook * * If data comes in the right link send a copy out right2left, and then * send the original onwards out through the left link. * Do the opposite for data coming in from the left link. * Data coming in right2left or left2right is forwarded * on through the appropriate destination hook as if it had come * from the other side. */ static int ng_tee_rcvdata(hook_p hook, item_p item) { const hi_p hinfo = NG_HOOK_PRIVATE(hook); hi_p h; int error = 0; struct mbuf *m; m = NGI_M(item); /* Update stats on incoming hook */ hinfo->stats.inOctets += m->m_pkthdr.len; hinfo->stats.inFrames++; /* Duplicate packet if requried */ if (hinfo->dup) { struct mbuf *m2; /* Copy packet (failure will not stop the original)*/ m2 = m_dup(m, M_NOWAIT); if (m2) { /* Deliver duplicate */ h = hinfo->dup; NG_SEND_DATA_ONLY(error, h->hook, m2); if (error == 0) { h->stats.outOctets += m->m_pkthdr.len; h->stats.outFrames++; } } } /* Deliver frame out destination hook */ if (hinfo->dest) { h = hinfo->dest; h->stats.outOctets += m->m_pkthdr.len; h->stats.outFrames++; NG_FWD_ITEM_HOOK(error, item, h->hook); } else NG_FREE_ITEM(item); return (error); } /* * We are going to be shut down soon * * If we have both a left and right hook, then we probably want to extricate * ourselves and leave the two peers still linked to each other. Otherwise we * should just shut down as a normal node would. */ static int ng_tee_close(node_p node) { const sc_p privdata = NG_NODE_PRIVATE(node); if (privdata->left.hook && privdata->right.hook) ng_bypass(privdata->left.hook, privdata->right.hook); return (0); } /* * Shutdown processing */ static int ng_tee_shutdown(node_p node) { const sc_p privdata = NG_NODE_PRIVATE(node); NG_NODE_SET_PRIVATE(node, NULL); free(privdata, M_NETGRAPH); NG_NODE_UNREF(node); return (0); } /* * Hook disconnection */ static int ng_tee_disconnect(hook_p hook) { sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); hi_p const hinfo = NG_HOOK_PRIVATE(hook); KASSERT(hinfo != NULL, ("%s: null info", __func__)); hinfo->hook = NULL; /* Recalculate internal pathes. */ if (sc->left.dest == hinfo) { sc->left.dest = sc->left.dup; sc->left.dup = NULL; } else if (sc->left.dup == hinfo) sc->left.dup = NULL; if (sc->right.dest == hinfo) { sc->right.dest = sc->right.dup; sc->right.dup = NULL; } else if (sc->right.dup == hinfo) sc->right.dup = NULL; if (sc->left2right.dest == hinfo) sc->left2right.dest = NULL; if (sc->right2left.dest == hinfo) sc->right2left.dest = NULL; /* Die when last hook disconnected. */ if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) && NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) ng_rmnode_self(NG_HOOK_NODE(hook)); return (0); }