/* * ng_pppoe.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_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef NG_SEPARATE_MALLOC static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); #else #define M_NETGRAPH_PPPOE M_NETGRAPH #endif #define SIGNOFF "session closed" /* * This section contains the netgraph method declarations for the * pppoe node. These methods define the netgraph pppoe 'type'. */ static ng_constructor_t ng_pppoe_constructor; static ng_rcvmsg_t ng_pppoe_rcvmsg; static ng_shutdown_t ng_pppoe_shutdown; static ng_newhook_t ng_pppoe_newhook; static ng_connect_t ng_pppoe_connect; static ng_rcvdata_t ng_pppoe_rcvdata; static ng_rcvdata_t ng_pppoe_rcvdata_ether; static ng_rcvdata_t ng_pppoe_rcvdata_debug; static ng_disconnect_t ng_pppoe_disconnect; /* Parse type for struct ngpppoe_init_data */ static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] = NG_PPPOE_INIT_DATA_TYPE_INFO; static const struct ng_parse_type ngpppoe_init_data_state_type = { &ng_parse_struct_type, &ngpppoe_init_data_type_fields }; /* Parse type for struct ngpppoe_sts */ static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] = NG_PPPOE_STS_TYPE_INFO; static const struct ng_parse_type ng_pppoe_sts_state_type = { &ng_parse_struct_type, &ng_pppoe_sts_type_fields }; /* List of commands and how to convert arguments to/from ASCII */ static const struct ng_cmdlist ng_pppoe_cmds[] = { { NGM_PPPOE_COOKIE, NGM_PPPOE_CONNECT, "pppoe_connect", &ngpppoe_init_data_state_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_LISTEN, "pppoe_listen", &ngpppoe_init_data_state_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_OFFER, "pppoe_offer", &ngpppoe_init_data_state_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_SERVICE, "pppoe_service", &ngpppoe_init_data_state_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_SUCCESS, "pppoe_success", &ng_pppoe_sts_state_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_FAIL, "pppoe_fail", &ng_pppoe_sts_state_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_CLOSE, "pppoe_close", &ng_pppoe_sts_state_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_SETMODE, "pppoe_setmode", &ng_parse_string_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_GETMODE, "pppoe_getmode", NULL, &ng_parse_string_type }, { NGM_PPPOE_COOKIE, NGM_PPPOE_SETENADDR, "setenaddr", &ng_parse_enaddr_type, NULL }, { NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP, "setmaxp", &ng_parse_uint16_type, NULL }, { 0 } }; /* Netgraph node type descriptor */ static struct ng_type typestruct = { .version = NG_ABI_VERSION, .name = NG_PPPOE_NODE_TYPE, .constructor = ng_pppoe_constructor, .rcvmsg = ng_pppoe_rcvmsg, .shutdown = ng_pppoe_shutdown, .newhook = ng_pppoe_newhook, .connect = ng_pppoe_connect, .rcvdata = ng_pppoe_rcvdata, .disconnect = ng_pppoe_disconnect, .cmdlist = ng_pppoe_cmds, }; NETGRAPH_INIT(pppoe, &typestruct); /* * States for the session state machine. * These have no meaning if there is no hook attached yet. */ enum state { PPPOE_SNONE=0, /* [both] Initial state */ PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ PPPOE_SINIT, /* [Client] Sent discovery initiation */ PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ PPPOE_SREQ, /* [Client] Sent a Request */ PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ PPPOE_CONNECTED, /* [Both] Connection established, Data received */ PPPOE_DEAD /* [Both] */ }; #define NUMTAGS 20 /* number of tags we are set up to work with */ /* * Information we store for each hook on each node for negotiating the * session. The mbuf and cluster are freed once negotiation has completed. * The whole negotiation block is then discarded. */ struct sess_neg { struct mbuf *m; /* holds cluster with last sent packet */ union packet *pkt; /* points within the above cluster */ struct callout handle; /* see timeout(9) */ u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ u_int numtags; const struct pppoe_tag *tags[NUMTAGS]; u_int service_len; u_int ac_name_len; struct datatag service; struct datatag ac_name; }; typedef struct sess_neg *negp; /* * Session information that is needed after connection. */ struct sess_con { hook_p hook; uint16_t Session_ID; enum state state; ng_ID_t creator; /* who to notify */ struct pppoe_full_hdr pkt_hdr; /* used when connected */ negp neg; /* used when negotiating */ LIST_ENTRY(sess_con) sessions; }; typedef struct sess_con *sessp; #define SESSHASHSIZE 0x0100 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1)) struct sess_hash_entry { struct mtx mtx; LIST_HEAD(hhead, sess_con) head; }; /* * Information we store for each node */ struct PPPoE { node_p node; /* back pointer to node */ hook_p ethernet_hook; hook_p debug_hook; u_int packets_in; /* packets in from ethernet */ u_int packets_out; /* packets out towards ethernet */ uint32_t flags; #define COMPAT_3COM 0x00000001 #define COMPAT_DLINK 0x00000002 struct ether_header eh; LIST_HEAD(, sess_con) listeners; struct sess_hash_entry sesshash[SESSHASHSIZE]; struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */ }; typedef struct PPPoE *priv_p; union uniq { char bytes[sizeof(void *)]; void *pointer; }; #define LEAVE(x) do { error = x; goto quit; } while(0) static void pppoe_start(sessp sp); static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); static const struct pppoe_tag *scan_tags(sessp sp, const struct pppoe_hdr* ph); static int pppoe_send_event(sessp sp, enum cmd cmdid); /************************************************************************* * Some basic utilities from the Linux version with author's permission.* * Author: Michal Ostrowski * ************************************************************************/ /* * Return the location where the next tag can be put */ static __inline const struct pppoe_tag* next_tag(const struct pppoe_hdr* ph) { return (const struct pppoe_tag*)(((const char*)(ph + 1)) + ntohs(ph->length)); } /* * Look for a tag of a specific type. * Don't trust any length the other end says, * but assume we already sanity checked ph->length. */ static const struct pppoe_tag* get_tag(const struct pppoe_hdr* ph, uint16_t idx) { const char *const end = (const char *)next_tag(ph); const struct pppoe_tag *pt = (const void *)(ph + 1); const char *ptn; /* * Keep processing tags while a tag header will still fit. */ while((const char*)(pt + 1) <= end) { /* * If the tag data would go past the end of the packet, abort. */ ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); if (ptn > end) { CTR2(KTR_NET, "%20s: invalid length for tag %d", __func__, idx); return (NULL); } if (pt->tag_type == idx) { CTR2(KTR_NET, "%20s: found tag %d", __func__, idx); return (pt); } pt = (const struct pppoe_tag*)ptn; } CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx); return (NULL); } /************************************************************************** * Inlines to initialise or add tags to a session's tag list. **************************************************************************/ /* * Initialise the session's tag list. */ static void init_tags(sessp sp) { KASSERT(sp->neg != NULL, ("%s: no neg", __func__)); sp->neg->numtags = 0; } static void insert_tag(sessp sp, const struct pppoe_tag *tp) { negp neg = sp->neg; int i; KASSERT(neg != NULL, ("%s: no neg", __func__)); if ((i = neg->numtags++) < NUMTAGS) { neg->tags[i] = tp; } else { log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to " "packet\n"); neg->numtags--; } } /* * Make up a packet, using the tags filled out for the session. * * Assume that the actual pppoe header and ethernet header * are filled out externally to this routine. * Also assume that neg->wh points to the correct * location at the front of the buffer space. */ static void make_packet(sessp sp) { struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; const struct pppoe_tag **tag; char *dp; int count; int tlen; uint16_t length = 0; KASSERT((sp->neg != NULL) && (sp->neg->m != NULL), ("%s: called from wrong state", __func__)); CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); dp = (char *)(&wh->ph + 1); for (count = 0, tag = sp->neg->tags; ((count < sp->neg->numtags) && (count < NUMTAGS)); tag++, count++) { tlen = ntohs((*tag)->tag_len) + sizeof(**tag); if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { log(LOG_NOTICE, "ng_pppoe: tags too long\n"); sp->neg->numtags = count; break; /* XXX chop off what's too long */ } bcopy(*tag, (char *)dp, tlen); length += tlen; dp += tlen; } wh->ph.length = htons(length); sp->neg->m->m_len = length + sizeof(*wh); sp->neg->m->m_pkthdr.len = length + sizeof(*wh); } /************************************************************************** * Routines to match a service. * **************************************************************************/ /* * Find a hook that has a service string that matches that * we are seeking. For now use a simple string. * In the future we may need something like regexp(). * * Null string is a wildcard (ANY service), according to RFC2516. * And historical FreeBSD wildcard is also "*". */ static hook_p pppoe_match_svc(node_p node, const struct pppoe_tag *tag) { const priv_p privp = NG_NODE_PRIVATE(node); sessp sp; LIST_FOREACH(sp, &privp->listeners, sessions) { negp neg = sp->neg; /* Empty Service-Name matches any service. */ if (neg->service_len == 0) break; /* Special case for a blank or "*" service name (wildcard). */ if (neg->service_len == 1 && neg->service.data[0] == '*') break; /* If the lengths don't match, that aint it. */ if (neg->service_len != ntohs(tag->tag_len)) continue; if (strncmp((const char *)(tag + 1), neg->service.data, ntohs(tag->tag_len)) == 0) break; } CTR3(KTR_NET, "%20s: matched %p for %s", __func__, sp?sp->hook:NULL, (const char *)(tag + 1)); return (sp?sp->hook:NULL); } /* * Broadcast the PADI packet in m0 to all listening hooks. * This routine is called when a PADI with empty Service-Name * tag is received. Client should receive PADOs with all * available services. */ static int pppoe_broadcast_padi(node_p node, struct mbuf *m0) { const priv_p privp = NG_NODE_PRIVATE(node); sessp sp; int error = 0; LIST_FOREACH(sp, &privp->listeners, sessions) { struct mbuf *m; m = m_dup(m0, M_NOWAIT); if (m == NULL) return (ENOMEM); NG_SEND_DATA_ONLY(error, sp->hook, m); if (error) return (error); } return (0); } /* * Find a hook, which name equals to given service. */ static hook_p pppoe_find_svc(node_p node, const char *svc_name, int svc_len) { const priv_p privp = NG_NODE_PRIVATE(node); sessp sp; LIST_FOREACH(sp, &privp->listeners, sessions) { negp neg = sp->neg; if (neg->service_len == svc_len && strncmp(svc_name, neg->service.data, svc_len) == 0) return (sp->hook); } return (NULL); } /************************************************************************** * Routines to find a particular session that matches an incoming packet. * **************************************************************************/ /* Find free session and add to hash. */ static uint16_t pppoe_getnewsession(sessp sp) { const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); static uint16_t pppoe_sid = 1; sessp tsp; uint16_t val, hash; restart: /* Atomicity is not needed here as value will be checked. */ val = pppoe_sid++; /* Spec says 0xFFFF is reserved, also don't use 0x0000. */ if (val == 0xffff || val == 0x0000) val = pppoe_sid = 1; /* Check it isn't already in use. */ hash = SESSHASH(val); mtx_lock(&privp->sesshash[hash].mtx); LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) { if (tsp->Session_ID == val) break; } if (!tsp) { sp->Session_ID = val; LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); } mtx_unlock(&privp->sesshash[hash].mtx); if (tsp) goto restart; CTR2(KTR_NET, "%20s: new sid %d", __func__, val); return (val); } /* Add specified session to hash. */ static void pppoe_addsession(sessp sp) { const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); uint16_t hash = SESSHASH(sp->Session_ID); mtx_lock(&privp->sesshash[hash].mtx); LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); mtx_unlock(&privp->sesshash[hash].mtx); } /* Delete specified session from hash. */ static void pppoe_delsession(sessp sp) { const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); uint16_t hash = SESSHASH(sp->Session_ID); mtx_lock(&privp->sesshash[hash].mtx); LIST_REMOVE(sp, sessions); mtx_unlock(&privp->sesshash[hash].mtx); } /* Find matching peer/session combination. */ static sessp pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh) { uint16_t session = ntohs(wh->ph.sid); uint16_t hash = SESSHASH(session); sessp sp = NULL; mtx_lock(&privp->sesshash[hash].mtx); LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) { if (sp->Session_ID == session && bcmp(sp->pkt_hdr.eh.ether_dhost, wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) { break; } } mtx_unlock(&privp->sesshash[hash].mtx); CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL, session); return (sp); } static hook_p pppoe_finduniq(node_p node, const struct pppoe_tag *tag) { hook_p hook = NULL; union uniq uniq; bcopy(tag + 1, uniq.bytes, sizeof(void *)); /* Cycle through all known hooks. */ LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { /* Skip any nonsession hook. */ if (NG_HOOK_PRIVATE(hook) == NULL) continue; if (uniq.pointer == NG_HOOK_PRIVATE(hook)) break; } CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, uniq.pointer); return (hook); } /************************************************************************** * Start of Netgraph entrypoints. * **************************************************************************/ /* * Allocate the private data structure and link it with node. */ static int ng_pppoe_constructor(node_p node) { priv_p privp; int i; /* Initialize private descriptor. */ privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO); /* Link structs together; this counts as our one reference to *node. */ NG_NODE_SET_PRIVATE(node, privp); privp->node = node; /* Initialize to standard mode. */ memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN); privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; LIST_INIT(&privp->listeners); for (i = 0; i < SESSHASHSIZE; i++) { mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF); LIST_INIT(&privp->sesshash[i].head); } CTR3(KTR_NET, "%20s: created node [%x] (%p)", __func__, node->nd_ID, node); return (0); } /* * Give our ok for a hook to be added... * point the hook's private info to the hook structure. * * The following hook names are special: * "ethernet": the hook that should be connected to a NIC. * "debug": copies of data sent out here (when I write the code). * All other hook names need only be unique. (the framework checks this). */ static int ng_pppoe_newhook(node_p node, hook_p hook, const char *name) { const priv_p privp = NG_NODE_PRIVATE(node); sessp sp; if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { privp->ethernet_hook = hook; NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether); } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { privp->debug_hook = hook; NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug); } else { /* * Any other unique name is OK. * The infrastructure has already checked that it's unique, * so just allocate it and hook it in. */ sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); if (sp == NULL) return (ENOMEM); NG_HOOK_SET_PRIVATE(hook, sp); sp->hook = hook; } CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)", __func__, node->nd_ID, node, name, hook); return(0); } /* * Hook has been added successfully. Request the MAC address of * the underlying Ethernet node. */ static int ng_pppoe_connect(hook_p hook) { const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); struct ng_mesg *msg; int error; if (hook != privp->ethernet_hook) return (0); /* * If this is Ethernet hook, then request MAC address * from our downstream. */ NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT); if (msg == NULL) return (ENOBUFS); /* * Our hook and peer hook have HK_INVALID flag set, * so we can't use NG_SEND_MSG_HOOK() macro here. */ NG_SEND_MSG_ID(error, privp->node, msg, NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)), NG_NODE_ID(privp->node)); return (error); } /* * Get a netgraph control message. * Check it is one we understand. If needed, send a response. * We sometimes save the address for an async action later. * Always free the message. */ static int ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) { priv_p privp = NG_NODE_PRIVATE(node); struct ngpppoe_init_data *ourmsg = NULL; struct ng_mesg *resp = NULL; int error = 0; hook_p hook = NULL; sessp sp = NULL; negp neg = NULL; struct ng_mesg *msg; NGI_GET_MSG(item, msg); CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d", __func__, node->nd_ID, node, msg->header.cmd, msg->header.typecookie); /* Deal with message according to cookie and command. */ switch (msg->header.typecookie) { case NGM_PPPOE_COOKIE: switch (msg->header.cmd) { case NGM_PPPOE_CONNECT: case NGM_PPPOE_LISTEN: case NGM_PPPOE_OFFER: case NGM_PPPOE_SERVICE: ourmsg = (struct ngpppoe_init_data *)msg->data; if (msg->header.arglen < sizeof(*ourmsg)) { log(LOG_ERR, "ng_pppoe[%x]: init data too " "small\n", node->nd_ID); LEAVE(EMSGSIZE); } if (msg->header.arglen - sizeof(*ourmsg) > PPPOE_SERVICE_NAME_SIZE) { log(LOG_ERR, "ng_pppoe[%x]: service name " "too big\n", node->nd_ID); LEAVE(EMSGSIZE); } if (msg->header.arglen - sizeof(*ourmsg) < ourmsg->data_len) { log(LOG_ERR, "ng_pppoe[%x]: init data has bad " "length, %d should be %zd\n", node->nd_ID, ourmsg->data_len, msg->header.arglen - sizeof (*ourmsg)); LEAVE(EMSGSIZE); } /* Make sure strcmp will terminate safely. */ ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; /* Find hook by name. */ hook = ng_findhook(node, ourmsg->hook); if (hook == NULL) LEAVE(ENOENT); sp = NG_HOOK_PRIVATE(hook); if (sp == NULL) LEAVE(EINVAL); if (msg->header.cmd == NGM_PPPOE_LISTEN) { /* * Ensure we aren't already listening for this * service. */ if (pppoe_find_svc(node, ourmsg->data, ourmsg->data_len) != NULL) LEAVE(EEXIST); } /* * PPPOE_SERVICE advertisments are set up * on sessions that are in PRIMED state. */ if (msg->header.cmd == NGM_PPPOE_SERVICE) break; if (sp->state != PPPOE_SNONE) { log(LOG_NOTICE, "ng_pppoe[%x]: Session already " "active\n", node->nd_ID); LEAVE(EISCONN); } /* * Set up prototype header. */ neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); if (neg == NULL) LEAVE(ENOMEM); neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); if (neg->m == NULL) { free(neg, M_NETGRAPH_PPPOE); LEAVE(ENOBUFS); } neg->m->m_pkthdr.rcvif = NULL; sp->neg = neg; ng_callout_init(&neg->handle); neg->m->m_len = sizeof(struct pppoe_full_hdr); neg->pkt = mtod(neg->m, union packet*); memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh, sizeof(struct ether_header)); neg->pkt->pkt_header.ph.ver = 0x1; neg->pkt->pkt_header.ph.type = 0x1; neg->pkt->pkt_header.ph.sid = 0x0000; neg->timeout = 0; sp->creator = NGI_RETADDR(item); } switch (msg->header.cmd) { case NGM_PPPOE_GET_STATUS: { struct ngpppoestat *stats; NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); if (!resp) LEAVE(ENOMEM); stats = (struct ngpppoestat *) resp->data; stats->packets_in = privp->packets_in; stats->packets_out = privp->packets_out; break; } case NGM_PPPOE_CONNECT: { /* * Check the hook exists and is Uninitialised. * Send a PADI request, and start the timeout logic. * Store the originator of this message so we can send * a success of fail message to them later. * Move the session to SINIT. * Set up the session to the correct state and * start it. */ int i, acnlen = 0, acnsep = 0, srvlen; for (i = 0; i < ourmsg->data_len; i++) { if (ourmsg->data[i] == '\\') { acnlen = i; acnsep = 1; break; } } srvlen = ourmsg->data_len - acnlen - acnsep; bcopy(ourmsg->data, neg->ac_name.data, acnlen); neg->ac_name_len = acnlen; neg->service.hdr.tag_type = PTT_SRV_NAME; neg->service.hdr.tag_len = htons((uint16_t)srvlen); bcopy(ourmsg->data + acnlen + acnsep, neg->service.data, srvlen); neg->service_len = srvlen; pppoe_start(sp); break; } case NGM_PPPOE_LISTEN: /* * Check the hook exists and is Uninitialised. * Install the service matching string. * Store the originator of this message so we can send * a success of fail message to them later. * Move the hook to 'LISTENING' */ neg->service.hdr.tag_type = PTT_SRV_NAME; neg->service.hdr.tag_len = htons((uint16_t)ourmsg->data_len); if (ourmsg->data_len) bcopy(ourmsg->data, neg->service.data, ourmsg->data_len); neg->service_len = ourmsg->data_len; neg->pkt->pkt_header.ph.code = PADT_CODE; /* * Wait for PADI packet coming from Ethernet. */ sp->state = PPPOE_LISTENING; LIST_INSERT_HEAD(&privp->listeners, sp, sessions); break; case NGM_PPPOE_OFFER: /* * Check the hook exists and is Uninitialised. * Store the originator of this message so we can send * a success of fail message to them later. * Store the AC-Name given and go to PRIMED. */ neg->ac_name.hdr.tag_type = PTT_AC_NAME; neg->ac_name.hdr.tag_len = htons((uint16_t)ourmsg->data_len); if (ourmsg->data_len) bcopy(ourmsg->data, neg->ac_name.data, ourmsg->data_len); neg->ac_name_len = ourmsg->data_len; neg->pkt->pkt_header.ph.code = PADO_CODE; /* * Wait for PADI packet coming from hook. */ sp->state = PPPOE_PRIMED; break; case NGM_PPPOE_SERVICE: /* * Check the session is primed. * for now just allow ONE service to be advertised. * If you do it twice you just overwrite. */ if (sp->state != PPPOE_PRIMED) { log(LOG_NOTICE, "ng_pppoe[%x]: session not " "primed\n", node->nd_ID); LEAVE(EISCONN); } neg = sp->neg; neg->service.hdr.tag_type = PTT_SRV_NAME; neg->service.hdr.tag_len = htons((uint16_t)ourmsg->data_len); if (ourmsg->data_len) bcopy(ourmsg->data, neg->service.data, ourmsg->data_len); neg->service_len = ourmsg->data_len; break; case NGM_PPPOE_SETMODE: { char *s; size_t len; if (msg->header.arglen == 0) LEAVE(EINVAL); s = (char *)msg->data; len = msg->header.arglen - 1; /* Search for matching mode string. */ if (len == strlen(NG_PPPOE_STANDARD) && (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) { privp->flags = 0; privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; break; } if (len == strlen(NG_PPPOE_3COM) && (strncmp(NG_PPPOE_3COM, s, len) == 0)) { privp->flags |= COMPAT_3COM; privp->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; break; } if (len == strlen(NG_PPPOE_DLINK) && (strncmp(NG_PPPOE_DLINK, s, len) == 0)) { privp->flags |= COMPAT_DLINK; break; } error = EINVAL; break; } case NGM_PPPOE_GETMODE: { char *s; size_t len = 0; if (privp->flags == 0) len += strlen(NG_PPPOE_STANDARD) + 1; if (privp->flags & COMPAT_3COM) len += strlen(NG_PPPOE_3COM) + 1; if (privp->flags & COMPAT_DLINK) len += strlen(NG_PPPOE_DLINK) + 1; NG_MKRESPONSE(resp, msg, len, M_NOWAIT); if (resp == NULL) LEAVE(ENOMEM); s = (char *)resp->data; if (privp->flags == 0) { len = strlen(NG_PPPOE_STANDARD); strlcpy(s, NG_PPPOE_STANDARD, len + 1); break; } if (privp->flags & COMPAT_3COM) { len = strlen(NG_PPPOE_3COM); strlcpy(s, NG_PPPOE_3COM, len + 1); s += len; } if (privp->flags & COMPAT_DLINK) { if (s != resp->data) *s++ = '|'; len = strlen(NG_PPPOE_DLINK); strlcpy(s, NG_PPPOE_DLINK, len + 1); } break; } case NGM_PPPOE_SETENADDR: if (msg->header.arglen != ETHER_ADDR_LEN) LEAVE(EINVAL); bcopy(msg->data, &privp->eh.ether_shost, ETHER_ADDR_LEN); break; case NGM_PPPOE_SETMAXP: if (msg->header.arglen != sizeof(uint16_t)) LEAVE(EINVAL); privp->max_payload.hdr.tag_type = PTT_MAX_PAYL; privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t)); privp->max_payload.data = htons(*((uint16_t *)msg->data)); break; default: LEAVE(EINVAL); } break; case NGM_ETHER_COOKIE: if (!(msg->header.flags & NGF_RESP)) LEAVE(EINVAL); switch (msg->header.cmd) { case NGM_ETHER_GET_ENADDR: if (msg->header.arglen != ETHER_ADDR_LEN) LEAVE(EINVAL); bcopy(msg->data, &privp->eh.ether_shost, ETHER_ADDR_LEN); break; default: LEAVE(EINVAL); } break; default: LEAVE(EINVAL); } /* Take care of synchronous response, if any. */ quit: CTR2(KTR_NET, "%20s: returning %d", __func__, error); NG_RESPOND_MSG(error, node, item, resp); /* Free the message and return. */ NG_FREE_MSG(msg); return(error); } /* * Start a client into the first state. A separate function because * it can be needed if the negotiation times out. */ static void pppoe_start(sessp sp) { hook_p hook = sp->hook; node_p node = NG_HOOK_NODE(hook); priv_p privp = NG_NODE_PRIVATE(node); negp neg = sp->neg; struct { struct pppoe_tag hdr; union uniq data; } __packed uniqtag; struct mbuf *m0; int error; /* * Kick the state machine into starting up. */ CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); sp->state = PPPOE_SINIT; /* * Reset the packet header to broadcast. Since we are * in a client mode use configured ethertype. */ memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh, sizeof(struct ether_header)); neg->pkt->pkt_header.ph.code = PADI_CODE; uniqtag.hdr.tag_type = PTT_HOST_UNIQ; uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); uniqtag.data.pointer = sp; init_tags(sp); insert_tag(sp, &uniqtag.hdr); insert_tag(sp, &neg->service.hdr); if (privp->max_payload.data != 0) insert_tag(sp, &privp->max_payload.hdr); make_packet(sp); /* * Send packet and prepare to retransmit it after timeout. */ ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, pppoe_ticker, NULL, 0); neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; m0 = m_copypacket(neg->m, M_NOWAIT); NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0); } static int send_acname(sessp sp, const struct pppoe_tag *tag) { int error, tlen; struct ng_mesg *msg; struct ngpppoe_sts *sts; CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, sizeof(struct ngpppoe_sts), M_NOWAIT); if (msg == NULL) return (ENOMEM); sts = (struct ngpppoe_sts *)msg->data; tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); strncpy(sts->hook, (const char *)(tag + 1), tlen); sts->hook[tlen] = '\0'; NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); return (error); } static int send_sessionid(sessp sp) { int error; struct ng_mesg *msg; CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, sizeof(uint16_t), M_NOWAIT); if (msg == NULL) return (ENOMEM); *(uint16_t *)msg->data = sp->Session_ID; NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); return (error); } static int send_maxp(sessp sp, const struct pppoe_tag *tag) { int error; struct ng_mesg *msg; struct ngpppoe_maxp *maxp; CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP, sizeof(struct ngpppoe_maxp), M_NOWAIT); if (msg == NULL) return (ENOMEM); maxp = (struct ngpppoe_maxp *)msg->data; strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); maxp->data = ntohs(((const struct maxptag *)tag)->data); NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); return (error); } /* * Receive data from session hook and do something with it. */ static int ng_pppoe_rcvdata(hook_p hook, item_p item) { node_p node = NG_HOOK_NODE(hook); const priv_p privp = NG_NODE_PRIVATE(node); sessp sp = NG_HOOK_PRIVATE(hook); struct pppoe_full_hdr *wh; struct mbuf *m; int error; CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", __func__, node->nd_ID, node, item, hook->hk_name, hook); NGI_GET_M(item, m); switch (sp->state) { case PPPOE_NEWCONNECTED: case PPPOE_CONNECTED: { /* * Remove PPP address and control fields, if any. * For example, ng_ppp(4) always sends LCP packets * with address and control fields as required by * generic PPP. PPPoE is an exception to the rule. */ if (m->m_pkthdr.len >= 2) { if (m->m_len < 2 && !(m = m_pullup(m, 2))) LEAVE(ENOBUFS); if (mtod(m, u_char *)[0] == 0xff && mtod(m, u_char *)[1] == 0x03) m_adj(m, 2); } /* * Bang in a pre-made header, and set the length up * to be correct. Then send it to the ethernet driver. */ M_PREPEND(m, sizeof(*wh), M_NOWAIT); if (m == NULL) LEAVE(ENOBUFS); wh = mtod(m, struct pppoe_full_hdr *); bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh)); NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m); privp->packets_out++; break; } case PPPOE_PRIMED: { struct { struct pppoe_tag hdr; union uniq data; } __packed uniqtag; const struct pppoe_tag *tag; struct mbuf *m0; const struct pppoe_hdr *ph; negp neg = sp->neg; uint16_t session; uint16_t length; uint8_t code; /* * A PADI packet is being returned by the application * that has set up this hook. This indicates that it * wants us to offer service. */ if (m->m_len < sizeof(*wh)) { m = m_pullup(m, sizeof(*wh)); if (m == NULL) LEAVE(ENOBUFS); } wh = mtod(m, struct pppoe_full_hdr *); ph = &wh->ph; session = ntohs(wh->ph.sid); length = ntohs(wh->ph.length); code = wh->ph.code; /* Use peers mode in session. */ neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; if (code != PADI_CODE) LEAVE(EINVAL); ng_uncallout(&neg->handle, node); /* * This is the first time we hear * from the client, so note it's * unicast address, replacing the * broadcast address. */ bcopy(wh->eh.ether_shost, neg->pkt->pkt_header.eh.ether_dhost, ETHER_ADDR_LEN); sp->state = PPPOE_SOFFER; neg->timeout = 0; neg->pkt->pkt_header.ph.code = PADO_CODE; /* * Start working out the tags to respond with. */ uniqtag.hdr.tag_type = PTT_AC_COOKIE; uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); uniqtag.data.pointer = sp; init_tags(sp); insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ if ((tag = get_tag(ph, PTT_SRV_NAME))) insert_tag(sp, tag); /* return service */ /* * If we have a NULL service request * and have an extra service defined in this hook, * then also add a tag for the extra service. * XXX this is a hack. eventually we should be able * to support advertising many services, not just one */ if (((tag == NULL) || (tag->tag_len == 0)) && (neg->service.hdr.tag_len != 0)) { insert_tag(sp, &neg->service.hdr); /* SERVICE */ } if ((tag = get_tag(ph, PTT_HOST_UNIQ))) insert_tag(sp, tag); /* returned hostunique */ insert_tag(sp, &uniqtag.hdr); scan_tags(sp, ph); make_packet(sp); /* * Send the offer but if they don't respond * in PPPOE_OFFER_TIMEOUT seconds, forget about it. */ ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, pppoe_ticker, NULL, 0); m0 = m_copypacket(sp->neg->m, M_NOWAIT); NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); privp->packets_out++; break; } /* * Packets coming from the hook make no sense * to sessions in the rest of states. Throw them away. */ default: LEAVE(ENETUNREACH); } quit: if (item) NG_FREE_ITEM(item); NG_FREE_M(m); return (error); } /* * Receive data from ether and do something with it. */ static int ng_pppoe_rcvdata_ether(hook_p hook, item_p item) { node_p node = NG_HOOK_NODE(hook); const priv_p privp = NG_NODE_PRIVATE(node); sessp sp; const struct pppoe_tag *utag = NULL, *tag = NULL; const struct pppoe_full_hdr *wh; const struct pppoe_hdr *ph; negp neg = NULL; struct mbuf *m; hook_p sendhook; int error = 0; uint16_t session; uint16_t length; uint8_t code; struct mbuf *m0; CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", __func__, node->nd_ID, node, item, hook->hk_name, hook); NGI_GET_M(item, m); /* * Dig out various fields from the packet. * Use them to decide where to send it. */ privp->packets_in++; if( m->m_len < sizeof(*wh)) { m = m_pullup(m, sizeof(*wh)); /* Checks length */ if (m == NULL) { log(LOG_NOTICE, "ng_pppoe[%x]: couldn't " "m_pullup(wh)\n", node->nd_ID); LEAVE(ENOBUFS); } } wh = mtod(m, struct pppoe_full_hdr *); length = ntohs(wh->ph.length); switch(wh->eh.ether_type) { case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */ case ETHERTYPE_PPPOE_DISC: /* * We need to try to make sure that the tag area * is contiguous, or we could wander off the end * of a buffer and make a mess. * (Linux wouldn't have this problem). */ if (m->m_pkthdr.len <= MHLEN) { if( m->m_len < m->m_pkthdr.len) { m = m_pullup(m, m->m_pkthdr.len); if (m == NULL) { log(LOG_NOTICE, "ng_pppoe[%x]: " "couldn't m_pullup(pkthdr)\n", node->nd_ID); LEAVE(ENOBUFS); } } } if (m->m_len != m->m_pkthdr.len) { /* * It's not all in one piece. * We need to do extra work. * Put it into a cluster. */ struct mbuf *n; n = m_dup(m, M_NOWAIT); m_freem(m); m = n; if (m) { /* just check we got a cluster */ if (m->m_len != m->m_pkthdr.len) { m_freem(m); m = NULL; } } if (m == NULL) { log(LOG_NOTICE, "ng_pppoe[%x]: packet " "fragmented\n", node->nd_ID); LEAVE(EMSGSIZE); } } wh = mtod(m, struct pppoe_full_hdr *); length = ntohs(wh->ph.length); ph = &wh->ph; session = ntohs(wh->ph.sid); code = wh->ph.code; switch(code) { case PADI_CODE: /* * We are a server: * Look for a hook with the required service and send * the ENTIRE packet up there. It should come back to * a new hook in PRIMED state. Look there for further * processing. */ tag = get_tag(ph, PTT_SRV_NAME); if (tag == NULL) { CTR1(KTR_NET, "%20s: PADI w/o Service-Name", __func__); LEAVE(ENETUNREACH); } /* * First, try to match Service-Name against our * listening hooks. If no success and we are in D-Link * compat mode and Service-Name is empty, then we * broadcast the PADI to all listening hooks. */ sendhook = pppoe_match_svc(node, tag); if (sendhook != NULL) NG_FWD_NEW_DATA(error, item, sendhook, m); else if (privp->flags & COMPAT_DLINK && ntohs(tag->tag_len) == 0) error = pppoe_broadcast_padi(node, m); else error = ENETUNREACH; break; case PADO_CODE: /* * We are a client: * Use the host_uniq tag to find the hook this is in * response to. Received #2, now send #3 * For now simply accept the first we receive. */ utag = get_tag(ph, PTT_HOST_UNIQ); if ((utag == NULL) || (ntohs(utag->tag_len) != sizeof(sp))) { log(LOG_NOTICE, "ng_pppoe[%x]: no host " "unique field\n", node->nd_ID); LEAVE(ENETUNREACH); } sendhook = pppoe_finduniq(node, utag); if (sendhook == NULL) { log(LOG_NOTICE, "ng_pppoe[%x]: no " "matching session\n", node->nd_ID); LEAVE(ENETUNREACH); } /* * Check the session is in the right state. * It needs to be in PPPOE_SINIT. */ sp = NG_HOOK_PRIVATE(sendhook); if (sp->state == PPPOE_SREQ || sp->state == PPPOE_CONNECTED) { break; /* Multiple PADO is OK. */ } if (sp->state != PPPOE_SINIT) { log(LOG_NOTICE, "ng_pppoe[%x]: session " "in wrong state\n", node->nd_ID); LEAVE(ENETUNREACH); } neg = sp->neg; /* If requested specific AC-name, check it. */ if (neg->ac_name_len) { tag = get_tag(ph, PTT_AC_NAME); if (!tag) { /* No PTT_AC_NAME in PADO */ break; } if (neg->ac_name_len != htons(tag->tag_len) || strncmp(neg->ac_name.data, (const char *)(tag + 1), neg->ac_name_len) != 0) { break; } } sp->state = PPPOE_SREQ; ng_uncallout(&neg->handle, node); /* * This is the first time we hear * from the server, so note it's * unicast address, replacing the * broadcast address . */ bcopy(wh->eh.ether_shost, neg->pkt->pkt_header.eh.ether_dhost, ETHER_ADDR_LEN); neg->timeout = 0; neg->pkt->pkt_header.ph.code = PADR_CODE; init_tags(sp); insert_tag(sp, utag); /* Host Unique */ if ((tag = get_tag(ph, PTT_AC_COOKIE))) insert_tag(sp, tag); /* return cookie */ if ((tag = get_tag(ph, PTT_AC_NAME))) { insert_tag(sp, tag); /* return it */ send_acname(sp, tag); } if ((tag = get_tag(ph, PTT_MAX_PAYL)) && (privp->max_payload.data != 0)) insert_tag(sp, tag); /* return it */ insert_tag(sp, &neg->service.hdr); /* Service */ scan_tags(sp, ph); make_packet(sp); sp->state = PPPOE_SREQ; ng_callout(&neg->handle, node, sp->hook, PPPOE_INITIAL_TIMEOUT * hz, pppoe_ticker, NULL, 0); neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; m0 = m_copypacket(neg->m, M_NOWAIT); NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); break; case PADR_CODE: /* * We are a server: * Use the ac_cookie tag to find the * hook this is in response to. */ utag = get_tag(ph, PTT_AC_COOKIE); if ((utag == NULL) || (ntohs(utag->tag_len) != sizeof(sp))) { LEAVE(ENETUNREACH); } sendhook = pppoe_finduniq(node, utag); if (sendhook == NULL) LEAVE(ENETUNREACH); /* * Check the session is in the right state. * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED. * If the latter, then this is a retry by the client, * so be nice, and resend. */ sp = NG_HOOK_PRIVATE(sendhook); if (sp->state == PPPOE_NEWCONNECTED) { /* * Whoa! drop back to resend that PADS packet. * We should still have a copy of it. */ sp->state = PPPOE_SOFFER; } else if (sp->state != PPPOE_SOFFER) LEAVE (ENETUNREACH); neg = sp->neg; ng_uncallout(&neg->handle, node); neg->pkt->pkt_header.ph.code = PADS_CODE; if (sp->Session_ID == 0) { neg->pkt->pkt_header.ph.sid = htons(pppoe_getnewsession(sp)); } send_sessionid(sp); neg->timeout = 0; /* * start working out the tags to respond with. */ init_tags(sp); insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ if ((tag = get_tag(ph, PTT_SRV_NAME))) insert_tag(sp, tag);/* return service */ if ((tag = get_tag(ph, PTT_HOST_UNIQ))) insert_tag(sp, tag); /* return it */ insert_tag(sp, utag); /* ac_cookie */ scan_tags(sp, ph); make_packet(sp); sp->state = PPPOE_NEWCONNECTED; /* Send the PADS without a timeout - we're now connected. */ m0 = m_copypacket(sp->neg->m, M_NOWAIT); NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); /* * Having sent the last Negotiation header, * Set up the stored packet header to be correct for * the actual session. But keep the negotialtion stuff * around in case we need to resend this last packet. * We'll discard it when we move from NEWCONNECTED * to CONNECTED */ sp->pkt_hdr = neg->pkt->pkt_header; /* Configure ethertype depending on what * ethertype was used at discovery phase */ if (sp->pkt_hdr.eh.ether_type == ETHERTYPE_PPPOE_3COM_DISC) sp->pkt_hdr.eh.ether_type = ETHERTYPE_PPPOE_3COM_SESS; else sp->pkt_hdr.eh.ether_type = ETHERTYPE_PPPOE_SESS; sp->pkt_hdr.ph.code = 0; pppoe_send_event(sp, NGM_PPPOE_SUCCESS); break; case PADS_CODE: /* * We are a client: * Use the host_uniq tag to find the hook this is in * response to. Take the session ID and store it away. * Also make sure the pre-made header is correct and * set us into Session mode. */ utag = get_tag(ph, PTT_HOST_UNIQ); if ((utag == NULL) || (ntohs(utag->tag_len) != sizeof(sp))) { LEAVE (ENETUNREACH); } sendhook = pppoe_finduniq(node, utag); if (sendhook == NULL) LEAVE(ENETUNREACH); /* * Check the session is in the right state. * It needs to be in PPPOE_SREQ. */ sp = NG_HOOK_PRIVATE(sendhook); if (sp->state != PPPOE_SREQ) LEAVE(ENETUNREACH); neg = sp->neg; ng_uncallout(&neg->handle, node); neg->pkt->pkt_header.ph.sid = wh->ph.sid; sp->Session_ID = ntohs(wh->ph.sid); pppoe_addsession(sp); send_sessionid(sp); neg->timeout = 0; sp->state = PPPOE_CONNECTED; /* * Now we have gone to Connected mode, * Free all resources needed for negotiation. * Keep a copy of the header we will be using. */ sp->pkt_hdr = neg->pkt->pkt_header; if (privp->flags & COMPAT_3COM) sp->pkt_hdr.eh.ether_type = ETHERTYPE_PPPOE_3COM_SESS; else sp->pkt_hdr.eh.ether_type = ETHERTYPE_PPPOE_SESS; sp->pkt_hdr.ph.code = 0; m_freem(neg->m); free(sp->neg, M_NETGRAPH_PPPOE); sp->neg = NULL; if ((tag = get_tag(ph, PTT_MAX_PAYL)) && (privp->max_payload.data != 0)) send_maxp(sp, tag); pppoe_send_event(sp, NGM_PPPOE_SUCCESS); break; case PADT_CODE: /* * Find matching peer/session combination. */ sp = pppoe_findsession(privp, wh); if (sp == NULL) LEAVE(ENETUNREACH); /* Disconnect that hook. */ ng_rmhook_self(sp->hook); break; default: LEAVE(EPFNOSUPPORT); } break; case ETHERTYPE_PPPOE_3COM_SESS: case ETHERTYPE_PPPOE_SESS: /* * Find matching peer/session combination. */ sp = pppoe_findsession(privp, wh); if (sp == NULL) LEAVE (ENETUNREACH); m_adj(m, sizeof(*wh)); /* If packet too short, dump it. */ if (m->m_pkthdr.len < length) LEAVE(EMSGSIZE); /* Also need to trim excess at the end */ if (m->m_pkthdr.len > length) { m_adj(m, -((int)(m->m_pkthdr.len - length))); } if ( sp->state != PPPOE_CONNECTED) { if (sp->state == PPPOE_NEWCONNECTED) { sp->state = PPPOE_CONNECTED; /* * Now we have gone to Connected mode, * Free all resources needed for negotiation. * Be paranoid about whether there may be * a timeout. */ m_freem(sp->neg->m); ng_uncallout(&sp->neg->handle, node); free(sp->neg, M_NETGRAPH_PPPOE); sp->neg = NULL; } else { LEAVE (ENETUNREACH); } } NG_FWD_NEW_DATA(error, item, sp->hook, m); break; default: LEAVE(EPFNOSUPPORT); } quit: if (item) NG_FREE_ITEM(item); NG_FREE_M(m); return (error); } /* * Receive data from debug hook and bypass it to ether. */ static int ng_pppoe_rcvdata_debug(hook_p hook, item_p item) { node_p node = NG_HOOK_NODE(hook); const priv_p privp = NG_NODE_PRIVATE(node); int error; CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", __func__, node->nd_ID, node, item, hook->hk_name, hook); NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook); privp->packets_out++; return (error); } /* * Do local shutdown processing.. * If we are a persistant device, we might refuse to go away, and * we'd only remove our links and reset ourself. */ static int ng_pppoe_shutdown(node_p node) { const priv_p privp = NG_NODE_PRIVATE(node); int i; for (i = 0; i < SESSHASHSIZE; i++) mtx_destroy(&privp->sesshash[i].mtx); NG_NODE_SET_PRIVATE(node, NULL); NG_NODE_UNREF(privp->node); free(privp, M_NETGRAPH_PPPOE); return (0); } /* * Hook disconnection * * Clean up all dangling links and information about the session/hook. * For this type, removal of the last link destroys the node. */ static int ng_pppoe_disconnect(hook_p hook) { node_p node = NG_HOOK_NODE(hook); priv_p privp = NG_NODE_PRIVATE(node); sessp sp; if (hook == privp->debug_hook) { privp->debug_hook = NULL; } else if (hook == privp->ethernet_hook) { privp->ethernet_hook = NULL; if (NG_NODE_IS_VALID(node)) ng_rmnode_self(node); } else { sp = NG_HOOK_PRIVATE(hook); if (sp->state != PPPOE_SNONE ) { pppoe_send_event(sp, NGM_PPPOE_CLOSE); } /* * According to the spec, if we are connected, * we should send a DISC packet if we are shutting down * a session. */ if ((privp->ethernet_hook) && ((sp->state == PPPOE_CONNECTED) || (sp->state == PPPOE_NEWCONNECTED))) { struct mbuf *m; /* Generate a packet of that type. */ MGETHDR(m, M_NOWAIT, MT_DATA); if (m == NULL) log(LOG_NOTICE, "ng_pppoe[%x]: session out of " "mbufs\n", node->nd_ID); else { struct pppoe_full_hdr *wh; struct pppoe_tag *tag; int msglen = strlen(SIGNOFF); int error = 0; m->m_pkthdr.rcvif = NULL; m->m_pkthdr.len = m->m_len = sizeof(*wh); wh = mtod(m, struct pppoe_full_hdr *); bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); /* Revert the stored header to DISC/PADT mode. */ wh->ph.code = PADT_CODE; /* * Configure ethertype depending on what * was used during sessions stage. */ if (wh->eh.ether_type == ETHERTYPE_PPPOE_3COM_SESS) wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; else wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; /* * Add a General error message and adjust * sizes. */ tag = (void *)(&wh->ph + 1); tag->tag_type = PTT_GEN_ERR; tag->tag_len = htons((u_int16_t)msglen); strncpy((char *)(tag + 1), SIGNOFF, msglen); m->m_pkthdr.len = (m->m_len += sizeof(*tag) + msglen); wh->ph.length = htons(sizeof(*tag) + msglen); NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m); } } if (sp->state == PPPOE_LISTENING) LIST_REMOVE(sp, sessions); else if (sp->Session_ID) pppoe_delsession(sp); /* * As long as we have somewhere to store the timeout handle, * we may have a timeout pending.. get rid of it. */ if (sp->neg) { ng_uncallout(&sp->neg->handle, node); if (sp->neg->m) m_freem(sp->neg->m); free(sp->neg, M_NETGRAPH_PPPOE); } free(sp, M_NETGRAPH_PPPOE); NG_HOOK_SET_PRIVATE(hook, NULL); } if ((NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node))) ng_rmnode_self(node); return (0); } /* * Timeouts come here. */ static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) { priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); sessp sp = NG_HOOK_PRIVATE(hook); negp neg = sp->neg; struct mbuf *m0 = NULL; int error = 0; CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d", __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID); switch(sp->state) { /* * Resend the last packet, using an exponential backoff. * After a period of time, stop growing the backoff, * And either leave it, or revert to the start. */ case PPPOE_SINIT: case PPPOE_SREQ: /* Timeouts on these produce resends. */ m0 = m_copypacket(sp->neg->m, M_NOWAIT); NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); ng_callout(&neg->handle, node, hook, neg->timeout * hz, pppoe_ticker, NULL, 0); if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { if (sp->state == PPPOE_SREQ) { /* Revert to SINIT mode. */ pppoe_start(sp); } else { neg->timeout = PPPOE_TIMEOUT_LIMIT; } } break; case PPPOE_PRIMED: case PPPOE_SOFFER: /* A timeout on these says "give up" */ ng_rmhook_self(hook); break; default: /* Timeouts have no meaning in other states. */ log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n", node->nd_ID); } } /* * Parse an incoming packet to see if any tags should be copied to the * output packet. Don't do any tags that have been handled in the main * state machine. */ static const struct pppoe_tag* scan_tags(sessp sp, const struct pppoe_hdr* ph) { const char *const end = (const char *)next_tag(ph); const char *ptn; const struct pppoe_tag *pt = (const void *)(ph + 1); /* * Keep processing tags while a tag header will still fit. */ CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); while((const char*)(pt + 1) <= end) { /* * If the tag data would go past the end of the packet, abort. */ ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); if(ptn > end) return NULL; switch (pt->tag_type) { case PTT_RELAY_SID: insert_tag(sp, pt); break; case PTT_EOL: return NULL; case PTT_SRV_NAME: case PTT_AC_NAME: case PTT_HOST_UNIQ: case PTT_AC_COOKIE: case PTT_VENDOR: case PTT_SRV_ERR: case PTT_SYS_ERR: case PTT_GEN_ERR: case PTT_MAX_PAYL: break; } pt = (const struct pppoe_tag*)ptn; } return NULL; } static int pppoe_send_event(sessp sp, enum cmd cmdid) { int error; struct ng_mesg *msg; struct ngpppoe_sts *sts; CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, sizeof(struct ngpppoe_sts), M_NOWAIT); if (msg == NULL) return (ENOMEM); sts = (struct ngpppoe_sts *)msg->data; strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); return (error); }