/* * PPP IP Control Protocol (IPCP) Module * * Written by Toshiharu OHNO (tony-o@iij.ad.jp) * * Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the Internet Initiative Japan, Inc. The name of the * IIJ may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * $Id: ipcp.c,v 1.81 1999/06/08 20:12:06 brian Exp $ * * TODO: * o Support IPADDRS properly * o Validate the length in IpcpDecodeConfig */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef NOALIAS #ifdef __FreeBSD__ #include #else #include "alias.h" #endif #endif #include "layer.h" #include "ua.h" #include "defs.h" #include "command.h" #include "mbuf.h" #include "log.h" #include "timer.h" #include "fsm.h" #include "proto.h" #include "lcp.h" #include "iplist.h" #include "throughput.h" #include "slcompress.h" #include "lqr.h" #include "hdlc.h" #include "ipcp.h" #include "filter.h" #include "descriptor.h" #include "vjcomp.h" #include "async.h" #include "ccp.h" #include "link.h" #include "physical.h" #include "mp.h" #ifndef NORADIUS #include "radius.h" #endif #include "bundle.h" #include "id.h" #include "arp.h" #include "systems.h" #include "prompt.h" #include "route.h" #include "iface.h" #undef REJECTED #define REJECTED(p, x) ((p)->peer_reject & (1<<(x))) #define issep(ch) ((ch) == ' ' || (ch) == '\t') #define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.') struct compreq { u_short proto; u_char slots; u_char compcid; }; static int IpcpLayerUp(struct fsm *); static void IpcpLayerDown(struct fsm *); static void IpcpLayerStart(struct fsm *); static void IpcpLayerFinish(struct fsm *); static void IpcpInitRestartCounter(struct fsm *, int); static void IpcpSendConfigReq(struct fsm *); static void IpcpSentTerminateReq(struct fsm *); static void IpcpSendTerminateAck(struct fsm *, u_char); static void IpcpDecodeConfig(struct fsm *, u_char *, int, int, struct fsm_decode *); static struct fsm_callbacks ipcp_Callbacks = { IpcpLayerUp, IpcpLayerDown, IpcpLayerStart, IpcpLayerFinish, IpcpInitRestartCounter, IpcpSendConfigReq, IpcpSentTerminateReq, IpcpSendTerminateAck, IpcpDecodeConfig, fsm_NullRecvResetReq, fsm_NullRecvResetAck }; static const char *cftypes[] = { /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ "???", "IPADDRS", /* 1: IP-Addresses */ /* deprecated */ "COMPPROTO", /* 2: IP-Compression-Protocol */ "IPADDR", /* 3: IP-Address */ }; #define NCFTYPES (sizeof cftypes/sizeof cftypes[0]) static const char *cftypes128[] = { /* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */ "???", "PRIDNS", /* 129: Primary DNS Server Address */ "PRINBNS", /* 130: Primary NBNS Server Address */ "SECDNS", /* 131: Secondary DNS Server Address */ "SECNBNS", /* 132: Secondary NBNS Server Address */ }; #define NCFTYPES128 (sizeof cftypes128/sizeof cftypes128[0]) void ipcp_AddInOctets(struct ipcp *ipcp, int n) { throughput_addin(&ipcp->throughput, n); } void ipcp_AddOutOctets(struct ipcp *ipcp, int n) { throughput_addout(&ipcp->throughput, n); } static void getdns(struct ipcp *ipcp, struct in_addr addr[2]) { FILE *fp; addr[0].s_addr = addr[1].s_addr = INADDR_ANY; if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { char buf[LINE_LEN], *cp, *end; int n; n = 0; buf[sizeof buf - 1] = '\0'; while (fgets(buf, sizeof buf - 1, fp)) { if (!strncmp(buf, "nameserver", 10) && issep(buf[10])) { for (cp = buf + 11; issep(*cp); cp++) ; for (end = cp; isip(*end); end++) ; *end = '\0'; if (inet_aton(cp, addr+n) && ++n == 2) break; } } if (n == 1) addr[1] = addr[0]; fclose(fp); } } static int setdns(struct ipcp *ipcp, struct in_addr addr[2]) { FILE *fp; char wbuf[LINE_LEN + 54]; int wlen; if (addr[0].s_addr == INADDR_ANY || addr[1].s_addr == INADDR_ANY) { struct in_addr old[2]; getdns(ipcp, old); if (addr[0].s_addr == INADDR_ANY) addr[0] = old[0]; if (addr[1].s_addr == INADDR_ANY) addr[1] = old[1]; } if (addr[0].s_addr == INADDR_ANY && addr[1].s_addr == INADDR_ANY) { log_Printf(LogWARN, "%s not modified: All nameservers NAKd\n", _PATH_RESCONF); return 0; } wlen = 0; if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { char buf[LINE_LEN]; int len; buf[sizeof buf - 1] = '\0'; while (fgets(buf, sizeof buf - 1, fp)) { if (strncmp(buf, "nameserver", 10) || !issep(buf[10])) { len = strlen(buf); if (len > sizeof wbuf - wlen) { log_Printf(LogWARN, "%s: Can only cope with max file size %d\n", _PATH_RESCONF, LINE_LEN); fclose(fp); return 0; } memcpy(wbuf + wlen, buf, len); wlen += len; } } fclose(fp); } if (addr[0].s_addr != INADDR_ANY) { snprintf(wbuf + wlen, sizeof wbuf - wlen, "nameserver %s\n", inet_ntoa(addr[0])); log_Printf(LogIPCP, "Primary nameserver set to %s", wbuf + wlen + 11); wlen += strlen(wbuf + wlen); } if (addr[1].s_addr != INADDR_ANY && addr[1].s_addr != addr[0].s_addr) { snprintf(wbuf + wlen, sizeof wbuf - wlen, "nameserver %s\n", inet_ntoa(addr[1])); log_Printf(LogIPCP, "Secondary nameserver set to %s", wbuf + wlen + 11); wlen += strlen(wbuf + wlen); } if (wlen) { int fd; if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_CREAT, 0644)) != -1) { if (write(fd, wbuf, wlen) != wlen) { log_Printf(LogERROR, "setdns: write(): %s\n", strerror(errno)); close(fd); return 0; } if (ftruncate(fd, wlen) == -1) { log_Printf(LogERROR, "setdns: truncate(): %s\n", strerror(errno)); close(fd); return 0; } close(fd); } else { log_Printf(LogERROR, "setdns: open(): %s\n", strerror(errno)); return 0; } } return 1; } int ipcp_Show(struct cmdargs const *arg) { struct ipcp *ipcp = &arg->bundle->ncp.ipcp; prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name, State2Nam(ipcp->fsm.state)); if (ipcp->fsm.state == ST_OPENED) { prompt_Printf(arg->prompt, " His side: %s, %s\n", inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto)); prompt_Printf(arg->prompt, " My side: %s, %s\n", inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto)); } if (ipcp->route) { prompt_Printf(arg->prompt, "\n"); route_ShowSticky(arg->prompt, ipcp->route, "Sticky routes", 1); } prompt_Printf(arg->prompt, "\nDefaults:\n"); prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config" " REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout, ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s", ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s"); prompt_Printf(arg->prompt, " My Address: %s/%d", inet_ntoa(ipcp->cfg.my_range.ipaddr), ipcp->cfg.my_range.width); prompt_Printf(arg->prompt, ", netmask %s\n", inet_ntoa(ipcp->cfg.netmask)); if (ipcp->cfg.HaveTriggerAddress) prompt_Printf(arg->prompt, " Trigger address: %s\n", inet_ntoa(ipcp->cfg.TriggerAddress)); prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot " "compression)\n", command_ShowNegval(ipcp->cfg.vj.neg), ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without"); if (iplist_isvalid(&ipcp->cfg.peer_list)) prompt_Printf(arg->prompt, " His Address: %s\n", ipcp->cfg.peer_list.src); else prompt_Printf(arg->prompt, " His Address: %s/%d\n", inet_ntoa(ipcp->cfg.peer_range.ipaddr), ipcp->cfg.peer_range.width); prompt_Printf(arg->prompt, " DNS: %s, ", inet_ntoa(ipcp->cfg.ns.dns[0])); prompt_Printf(arg->prompt, "%s, %s\n", inet_ntoa(ipcp->cfg.ns.dns[1]), command_ShowNegval(ipcp->cfg.ns.dns_neg)); prompt_Printf(arg->prompt, " NetBIOS NS: %s, ", inet_ntoa(ipcp->cfg.ns.nbns[0])); prompt_Printf(arg->prompt, "%s\n", inet_ntoa(ipcp->cfg.ns.nbns[1])); prompt_Printf(arg->prompt, "\n"); throughput_disp(&ipcp->throughput, arg->prompt); return 0; } int ipcp_vjset(struct cmdargs const *arg) { if (arg->argc != arg->argn+2) return -1; if (!strcasecmp(arg->argv[arg->argn], "slots")) { int slots; slots = atoi(arg->argv[arg->argn+1]); if (slots < 4 || slots > 16) return 1; arg->bundle->ncp.ipcp.cfg.vj.slots = slots; return 0; } else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) { if (!strcasecmp(arg->argv[arg->argn+1], "on")) arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1; else if (!strcasecmp(arg->argv[arg->argn+1], "off")) arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0; else return 2; return 0; } return -1; } void ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l, const struct fsm_parent *parent) { struct hostent *hp; char name[MAXHOSTNAMELEN]; static const char *timer_names[] = {"IPCP restart", "IPCP openmode", "IPCP stopped"}; fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP, bundle, l, parent, &ipcp_Callbacks, timer_names); ipcp->route = NULL; ipcp->cfg.vj.slots = DEF_VJ_STATES; ipcp->cfg.vj.slotcomp = 1; memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range); if (gethostname(name, sizeof name) == 0) { hp = gethostbyname(name); if (hp && hp->h_addrtype == AF_INET) memcpy(&ipcp->cfg.my_range.ipaddr.s_addr, hp->h_addr, hp->h_length); } ipcp->cfg.netmask.s_addr = INADDR_ANY; memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); iplist_setsrc(&ipcp->cfg.peer_list, ""); ipcp->cfg.HaveTriggerAddress = 0; ipcp->cfg.ns.dns[0].s_addr = INADDR_ANY; ipcp->cfg.ns.dns[1].s_addr = INADDR_ANY; ipcp->cfg.ns.dns_neg = 0; ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY; ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY; ipcp->cfg.fsm.timeout = DEF_FSMRETRY; ipcp->cfg.fsm.maxreq = DEF_FSMTRIES; ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES; ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED; memset(&ipcp->vj, '\0', sizeof ipcp->vj); throughput_init(&ipcp->throughput, SAMPLE_PERIOD); memset(ipcp->Queue, '\0', sizeof ipcp->Queue); ipcp_Setup(ipcp, INADDR_NONE); } void ipcp_SetLink(struct ipcp *ipcp, struct link *l) { ipcp->fsm.link = l; } void ipcp_Setup(struct ipcp *ipcp, u_int32_t mask) { struct iface *iface = ipcp->fsm.bundle->iface; int pos, n; ipcp->fsm.open_mode = 0; ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask; if (iplist_isvalid(&ipcp->cfg.peer_list)) { /* Try to give the peer a previously configured IP address */ for (n = 0; n < iface->in_addrs; n++) { pos = iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd); if (pos != -1) { ipcp->cfg.peer_range.ipaddr = iplist_setcurpos(&ipcp->cfg.peer_list, pos); break; } } if (n == iface->in_addrs) /* Ok, so none of 'em fit.... pick a random one */ ipcp->cfg.peer_range.ipaddr = iplist_setrandpos(&ipcp->cfg.peer_list); ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST; ipcp->cfg.peer_range.width = 32; } ipcp->heis1172 = 0; ipcp->peer_ip = ipcp->cfg.peer_range.ipaddr; ipcp->peer_compproto = 0; if (ipcp->cfg.HaveTriggerAddress) { /* * Some implementations of PPP require that we send a * *special* value as our address, even though the rfc specifies * full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0"). */ ipcp->my_ip = ipcp->cfg.TriggerAddress; log_Printf(LogIPCP, "Using trigger address %s\n", inet_ntoa(ipcp->cfg.TriggerAddress)); } else { /* * Otherwise, if we've used an IP number before and it's still within * the network specified on the ``set ifaddr'' line, we really * want to keep that IP number so that we can keep any existing * connections that are bound to that IP (assuming we're not * ``iface-alias''ing). */ for (n = 0; n < iface->in_addrs; n++) if ((iface->in_addr[n].ifa.s_addr & ipcp->cfg.my_range.mask.s_addr) == (ipcp->cfg.my_range.ipaddr.s_addr & ipcp->cfg.my_range.mask.s_addr)) { ipcp->my_ip = iface->in_addr[n].ifa; break; } if (n == iface->in_addrs) ipcp->my_ip = ipcp->cfg.my_range.ipaddr; } if (IsEnabled(ipcp->cfg.vj.neg) #ifndef NORADIUS || (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj) #endif ) ipcp->my_compproto = (PROTO_VJCOMP << 16) + ((ipcp->cfg.vj.slots - 1) << 8) + ipcp->cfg.vj.slotcomp; else ipcp->my_compproto = 0; sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1); ipcp->peer_reject = 0; ipcp->my_reject = 0; } static int ipcp_doproxyall(struct bundle *bundle, int (*proxyfun)(struct bundle *, struct in_addr, int), int s) { int n, ret; struct sticky_route *rp; struct in_addr addr; struct ipcp *ipcp; ipcp = &bundle->ncp.ipcp; for (rp = ipcp->route; rp != NULL; rp = rp->next) { if (rp->mask.s_addr == INADDR_BROADCAST) continue; n = ntohl(INADDR_BROADCAST) - ntohl(rp->mask.s_addr) - 1; if (n > 0 && n <= 254 && rp->dst.s_addr != INADDR_ANY) { addr = rp->dst; while (n--) { addr.s_addr = htonl(ntohl(addr.s_addr) + 1); log_Printf(LogDEBUG, "ipcp_doproxyall: %s\n", inet_ntoa(addr)); ret = (*proxyfun)(bundle, addr, s); if (!ret) return ret; } } } return 0; } static int ipcp_SetIPaddress(struct bundle *bundle, struct in_addr myaddr, struct in_addr hisaddr, int silent) { struct in_addr mask, oaddr, none = { INADDR_ANY }; mask = addr2mask(myaddr); if (bundle->ncp.ipcp.ifmask.s_addr != INADDR_ANY && (bundle->ncp.ipcp.ifmask.s_addr & mask.s_addr) == mask.s_addr) mask.s_addr = bundle->ncp.ipcp.ifmask.s_addr; oaddr.s_addr = bundle->iface->in_addrs ? bundle->iface->in_addr[0].ifa.s_addr : INADDR_ANY; if (!iface_inAdd(bundle->iface, myaddr, mask, hisaddr, IFACE_ADD_FIRST|IFACE_FORCE_ADD)) return -1; if (!Enabled(bundle, OPT_IFACEALIAS) && bundle->iface->in_addrs > 1 && myaddr.s_addr != oaddr.s_addr) /* Nuke the old one */ iface_inDelete(bundle->iface, oaddr); if (bundle->ncp.ipcp.cfg.sendpipe > 0 || bundle->ncp.ipcp.cfg.recvpipe > 0) bundle_SetRoute(bundle, RTM_CHANGE, hisaddr, myaddr, none, 0, 0); if (Enabled(bundle, OPT_SROUTES)) route_Change(bundle, bundle->ncp.ipcp.route, myaddr, hisaddr); #ifndef NORADIUS if (bundle->radius.valid) route_Change(bundle, bundle->radius.routes, myaddr, hisaddr); #endif if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) { int s = ID0socket(AF_INET, SOCK_DGRAM, 0); if (s < 0) log_Printf(LogERROR, "ipcp_SetIPaddress: socket(): %s\n", strerror(errno)); else { if (Enabled(bundle, OPT_PROXYALL)) ipcp_doproxyall(bundle, arp_SetProxy, s); else if (Enabled(bundle, OPT_PROXY)) arp_SetProxy(bundle, hisaddr, s); close(s); } } return 0; } static struct in_addr ChooseHisAddr(struct bundle *bundle, struct in_addr gw) { struct in_addr try; u_long f; for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) { try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list); log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n", f, inet_ntoa(try)); if (ipcp_SetIPaddress(bundle, gw, try, 1) == 0) { log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try)); break; } } if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) { log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); try.s_addr = INADDR_ANY; } return try; } static void IpcpInitRestartCounter(struct fsm *fp, int what) { /* Set fsm timer load */ struct ipcp *ipcp = fsm2ipcp(fp); fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS; switch (what) { case FSM_REQ_TIMER: fp->restart = ipcp->cfg.fsm.maxreq; break; case FSM_TRM_TIMER: fp->restart = ipcp->cfg.fsm.maxtrm; break; default: fp->restart = 1; break; } } static void IpcpSendConfigReq(struct fsm *fp) { /* Send config REQ please */ struct physical *p = link2physical(fp->link); struct ipcp *ipcp = fsm2ipcp(fp); u_char buff[24]; struct lcp_opt *o; o = (struct lcp_opt *)buff; if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) { memcpy(o->data, &ipcp->my_ip.s_addr, 4); INC_LCP_OPT(TY_IPADDR, 6, o); } if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) { if (ipcp->heis1172) { u_int16_t proto = PROTO_VJCOMP; ua_htons(&proto, o->data); INC_LCP_OPT(TY_COMPPROTO, 4, o); } else { struct compreq req; req.proto = htons(ipcp->my_compproto >> 16); req.slots = (ipcp->my_compproto >> 8) & 255; req.compcid = ipcp->my_compproto & 1; memcpy(o->data, &req, 4); INC_LCP_OPT(TY_COMPPROTO, 6, o); } } if (IsEnabled(ipcp->cfg.ns.dns_neg) && !REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS) && !REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) { struct in_addr dns[2]; getdns(ipcp, dns); memcpy(o->data, &dns[0].s_addr, 4); INC_LCP_OPT(TY_PRIMARY_DNS, 6, o); memcpy(o->data, &dns[1].s_addr, 4); INC_LCP_OPT(TY_SECONDARY_DNS, 6, o); } fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff, MB_IPCPOUT); } static void IpcpSentTerminateReq(struct fsm *fp) { /* Term REQ just sent by FSM */ } static void IpcpSendTerminateAck(struct fsm *fp, u_char id) { /* Send Term ACK please */ fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT); } static void IpcpLayerStart(struct fsm *fp) { /* We're about to start up ! */ struct ipcp *ipcp = fsm2ipcp(fp); log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name); throughput_start(&ipcp->throughput, "IPCP throughput", Enabled(fp->bundle, OPT_THROUGHPUT)); fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; } static void IpcpLayerFinish(struct fsm *fp) { /* We're now down */ struct ipcp *ipcp = fsm2ipcp(fp); log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name); throughput_stop(&ipcp->throughput); throughput_log(&ipcp->throughput, LogIPCP, NULL); } void ipcp_CleanInterface(struct ipcp *ipcp) { struct iface *iface = ipcp->fsm.bundle->iface; route_Clean(ipcp->fsm.bundle, ipcp->route); if (iface->in_addrs && (Enabled(ipcp->fsm.bundle, OPT_PROXY) || Enabled(ipcp->fsm.bundle, OPT_PROXYALL))) { int s = ID0socket(AF_INET, SOCK_DGRAM, 0); if (s < 0) log_Printf(LogERROR, "ipcp_CleanInterface: socket: %s\n", strerror(errno)); else { if (Enabled(ipcp->fsm.bundle, OPT_PROXYALL)) ipcp_doproxyall(ipcp->fsm.bundle, arp_ClearProxy, s); else if (Enabled(ipcp->fsm.bundle, OPT_PROXY)) arp_ClearProxy(ipcp->fsm.bundle, iface->in_addr[0].brd, s); close(s); } } iface_inClear(ipcp->fsm.bundle->iface, IFACE_CLEAR_ALL); } static void IpcpLayerDown(struct fsm *fp) { /* About to come down */ static int recursing; struct ipcp *ipcp = fsm2ipcp(fp); const char *s; if (!recursing++) { if (ipcp->fsm.bundle->iface->in_addrs) s = inet_ntoa(ipcp->fsm.bundle->iface->in_addr[0].ifa); else s = "Interface configuration error !"; log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, s); /* * XXX this stuff should really live in the FSM. Our config should * associate executable sections in files with events. */ if (system_Select(fp->bundle, s, LINKDOWNFILE, NULL, NULL) < 0) { if (bundle_GetLabel(fp->bundle)) { if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), LINKDOWNFILE, NULL, NULL) < 0) system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); } else system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL); } ipcp_Setup(ipcp, INADDR_NONE); } recursing--; } int ipcp_InterfaceUp(struct ipcp *ipcp) { if (ipcp_SetIPaddress(ipcp->fsm.bundle, ipcp->my_ip, ipcp->peer_ip, 0) < 0) { log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n"); return 0; } #ifndef NOALIAS if (ipcp->fsm.bundle->AliasEnabled) PacketAliasSetAddress(ipcp->my_ip); #endif return 1; } static int IpcpLayerUp(struct fsm *fp) { /* We're now up */ struct ipcp *ipcp = fsm2ipcp(fp); char tbuff[16]; log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name); snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip)); log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n", tbuff, inet_ntoa(ipcp->peer_ip)); if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP) sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255); if (!ipcp_InterfaceUp(ipcp)) return 0; /* * XXX this stuff should really live in the FSM. Our config should * associate executable sections in files with events. */ if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) { if (bundle_GetLabel(fp->bundle)) { if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle), LINKUPFILE, NULL, NULL) < 0) system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); } else system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL); } fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3; log_DisplayPrompts(); return 1; } static int AcceptableAddr(const struct in_range *prange, struct in_addr ipaddr) { /* Is the given IP in the given range ? */ return (prange->ipaddr.s_addr & prange->mask.s_addr) == (ipaddr.s_addr & prange->mask.s_addr) && ipaddr.s_addr; } static void IpcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type, struct fsm_decode *dec) { /* Deal with incoming PROTO_IPCP */ struct iface *iface = fp->bundle->iface; struct ipcp *ipcp = fsm2ipcp(fp); int type, length, gotdns, gotdnsnak, n; u_int32_t compproto; struct compreq *pcomp; struct in_addr ipaddr, dstipaddr, have_ip, dns[2], dnsnak[2]; char tbuff[100], tbuff2[100]; gotdns = 0; gotdnsnak = 0; dnsnak[0].s_addr = dnsnak[1].s_addr = INADDR_ANY; while (plen >= sizeof(struct fsmconfig)) { type = *cp; length = cp[1]; if (length == 0) { log_Printf(LogIPCP, "%s: IPCP size zero\n", fp->link->name); break; } if (type < NCFTYPES) snprintf(tbuff, sizeof tbuff, " %s[%d] ", cftypes[type], length); else if (type > 128 && type < 128 + NCFTYPES128) snprintf(tbuff, sizeof tbuff, " %s[%d] ", cftypes128[type-128], length); else snprintf(tbuff, sizeof tbuff, " <%d>[%d] ", type, length); switch (type) { case TY_IPADDR: /* RFC1332 */ memcpy(&ipaddr.s_addr, cp + 2, 4); log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); switch (mode_type) { case MODE_REQ: if (iplist_isvalid(&ipcp->cfg.peer_list)) { if (ipaddr.s_addr == INADDR_ANY || iplist_ip2pos(&ipcp->cfg.peer_list, ipaddr) < 0 || ipcp_SetIPaddress(fp->bundle, ipcp->cfg.my_range.ipaddr, ipaddr, 1)) { log_Printf(LogIPCP, "%s: Address invalid or already in use\n", inet_ntoa(ipaddr)); /* * If we've already had a valid address configured for the peer, * try NAKing with that so that we don't have to upset things * too much. */ for (n = 0; n < iface->in_addrs; n++) if (iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd) >=0) { ipcp->peer_ip = iface->in_addr[n].brd; break; } if (n == iface->in_addrs) /* Just pick an IP number from our list */ ipcp->peer_ip = ChooseHisAddr (fp->bundle, ipcp->cfg.my_range.ipaddr); if (ipcp->peer_ip.s_addr == INADDR_ANY) { memcpy(dec->rejend, cp, length); dec->rejend += length; } else { memcpy(dec->nakend, cp, 2); memcpy(dec->nakend + 2, &ipcp->peer_ip.s_addr, length - 2); dec->nakend += length; } break; } } else if (!AcceptableAddr(&ipcp->cfg.peer_range, ipaddr)) { /* * If destination address is not acceptable, NAK with what we * want to use. */ memcpy(dec->nakend, cp, 2); for (n = 0; n < iface->in_addrs; n++) if ((iface->in_addr[n].brd.s_addr & ipcp->cfg.peer_range.mask.s_addr) == (ipcp->cfg.peer_range.ipaddr.s_addr & ipcp->cfg.peer_range.mask.s_addr)) { /* We prefer the already-configured address */ memcpy(dec->nakend + 2, &iface->in_addr[n].brd.s_addr, length - 2); break; } if (n == iface->in_addrs) memcpy(dec->nakend + 2, &ipcp->peer_ip.s_addr, length - 2); dec->nakend += length; break; } ipcp->peer_ip = ipaddr; memcpy(dec->ackend, cp, length); dec->ackend += length; break; case MODE_NAK: if (AcceptableAddr(&ipcp->cfg.my_range, ipaddr)) { /* Use address suggested by peer */ snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff, inet_ntoa(ipcp->my_ip)); log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr)); ipcp->my_ip = ipaddr; bundle_AdjustFilters(fp->bundle, &ipcp->my_ip, NULL); } else { log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE, "%s: Unacceptable address!\n", inet_ntoa(ipaddr)); fsm_Close(&ipcp->fsm); } break; case MODE_REJ: ipcp->peer_reject |= (1 << type); break; } break; case TY_COMPPROTO: pcomp = (struct compreq *)(cp + 2); compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) + pcomp->compcid; log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto)); switch (mode_type) { case MODE_REQ: if (!IsAccepted(ipcp->cfg.vj.neg)) { memcpy(dec->rejend, cp, length); dec->rejend += length; } else { switch (length) { case 4: /* RFC1172 */ if (ntohs(pcomp->proto) == PROTO_VJCOMP) { log_Printf(LogWARN, "Peer is speaking RFC1172 compression " "protocol !\n"); ipcp->heis1172 = 1; ipcp->peer_compproto = compproto; memcpy(dec->ackend, cp, length); dec->ackend += length; } else { memcpy(dec->nakend, cp, 2); pcomp->proto = htons(PROTO_VJCOMP); memcpy(dec->nakend+2, &pcomp, 2); dec->nakend += length; } break; case 6: /* RFC1332 */ if (ntohs(pcomp->proto) == PROTO_VJCOMP) { if (pcomp->slots <= MAX_VJ_STATES && pcomp->slots >= MIN_VJ_STATES) { /* Ok, we can do that */ ipcp->peer_compproto = compproto; ipcp->heis1172 = 0; memcpy(dec->ackend, cp, length); dec->ackend += length; } else { /* Get as close as we can to what he wants */ ipcp->heis1172 = 0; memcpy(dec->nakend, cp, 2); pcomp->slots = pcomp->slots < MIN_VJ_STATES ? MIN_VJ_STATES : MAX_VJ_STATES; memcpy(dec->nakend+2, &pcomp, sizeof pcomp); dec->nakend += length; } } else { /* What we really want */ memcpy(dec->nakend, cp, 2); pcomp->proto = htons(PROTO_VJCOMP); pcomp->slots = DEF_VJ_STATES; pcomp->compcid = 1; memcpy(dec->nakend+2, &pcomp, sizeof pcomp); dec->nakend += length; } break; default: memcpy(dec->rejend, cp, length); dec->rejend += length; break; } } break; case MODE_NAK: if (ntohs(pcomp->proto) == PROTO_VJCOMP) { if (pcomp->slots > MAX_VJ_STATES) pcomp->slots = MAX_VJ_STATES; else if (pcomp->slots < MIN_VJ_STATES) pcomp->slots = MIN_VJ_STATES; compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) + pcomp->compcid; } else compproto = 0; log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n", tbuff, ipcp->my_compproto, compproto); ipcp->my_compproto = compproto; break; case MODE_REJ: ipcp->peer_reject |= (1 << type); break; } break; case TY_IPADDRS: /* RFC1172 */ memcpy(&ipaddr.s_addr, cp + 2, 4); memcpy(&dstipaddr.s_addr, cp + 6, 4); snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr)); log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr)); switch (mode_type) { case MODE_REQ: memcpy(dec->rejend, cp, length); dec->rejend += length; break; case MODE_NAK: case MODE_REJ: break; } break; case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */ case TY_SECONDARY_DNS: memcpy(&ipaddr.s_addr, cp + 2, 4); log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); switch (mode_type) { case MODE_REQ: if (!IsAccepted(ipcp->cfg.ns.dns_neg)) { ipcp->my_reject |= (1 << (type - TY_ADJUST_NS)); memcpy(dec->rejend, cp, length); dec->rejend += length; break; } if (!gotdns) { dns[0] = ipcp->cfg.ns.dns[0]; dns[1] = ipcp->cfg.ns.dns[1]; if (dns[0].s_addr == INADDR_ANY && dns[1].s_addr == INADDR_ANY) getdns(ipcp, dns); gotdns = 1; } have_ip = dns[type == TY_PRIMARY_DNS ? 0 : 1]; if (ipaddr.s_addr != have_ip.s_addr) { /* * The client has got the DNS stuff wrong (first request) so * we'll tell 'em how it is */ memcpy(dec->nakend, cp, 2); /* copy first two (type/length) */ memcpy(dec->nakend + 2, &have_ip.s_addr, length - 2); dec->nakend += length; } else { /* * Otherwise they have it right (this time) so we send a ack packet * back confirming it... end of story */ memcpy(dec->ackend, cp, length); dec->ackend += length; } break; case MODE_NAK: /* what does this mean?? */ if (IsEnabled(ipcp->cfg.ns.dns_neg)) { gotdnsnak = 1; memcpy(&dnsnak[type == TY_PRIMARY_DNS ? 0 : 1].s_addr, cp + 2, 4); } break; case MODE_REJ: /* Can't do much, stop asking */ ipcp->peer_reject |= (1 << (type - TY_ADJUST_NS)); break; } break; case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */ case TY_SECONDARY_NBNS: memcpy(&ipaddr.s_addr, cp + 2, 4); log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr)); switch (mode_type) { case MODE_REQ: have_ip.s_addr = ipcp->cfg.ns.nbns[type == TY_PRIMARY_NBNS ? 0 : 1].s_addr; if (have_ip.s_addr == INADDR_ANY) { log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n"); ipcp->my_reject |= (1 << (type - TY_ADJUST_NS)); memcpy(dec->rejend, cp, length); dec->rejend += length; break; } if (ipaddr.s_addr != have_ip.s_addr) { memcpy(dec->nakend, cp, 2); memcpy(dec->nakend+2, &have_ip.s_addr, length); dec->nakend += length; } else { memcpy(dec->ackend, cp, length); dec->ackend += length; } break; case MODE_NAK: log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", type); break; case MODE_REJ: log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", type); break; } break; default: if (mode_type != MODE_NOP) { ipcp->my_reject |= (1 << type); memcpy(dec->rejend, cp, length); dec->rejend += length; } break; } plen -= length; cp += length; } if (gotdnsnak) if (!setdns(ipcp, dnsnak)) { ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS)); ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS)); } if (mode_type != MODE_NOP) { if (dec->rejend != dec->rej) { /* rejects are preferred */ dec->ackend = dec->ack; dec->nakend = dec->nak; } else if (dec->nakend != dec->nak) /* then NAKs */ dec->ackend = dec->ack; } } extern struct mbuf * ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp) { /* Got PROTO_IPCP from link */ mbuf_SetType(bp, MB_IPCPIN); if (bundle_Phase(bundle) == PHASE_NETWORK) fsm_Input(&bundle->ncp.ipcp.fsm, bp); else { if (bundle_Phase(bundle) < PHASE_NETWORK) log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n", l->name, bundle_PhaseName(bundle)); mbuf_Free(bp); } return NULL; } int ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr) { struct ipcp *ipcp = &bundle->ncp.ipcp; memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); iplist_reset(&ipcp->cfg.peer_list); ipcp->peer_ip = ipcp->cfg.peer_range.ipaddr = hisaddr; ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST; ipcp->cfg.peer_range.width = 32; if (ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr, hisaddr, 0) < 0) return 0; return 1; /* Ok */ } int ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr) { struct ipcp *ipcp = &bundle->ncp.ipcp; /* Use `hisaddr' for the peers address (set iface if `setaddr') */ memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range); iplist_reset(&ipcp->cfg.peer_list); if (strpbrk(hisaddr, ",-")) { iplist_setsrc(&ipcp->cfg.peer_list, hisaddr); if (iplist_isvalid(&ipcp->cfg.peer_list)) { iplist_setrandpos(&ipcp->cfg.peer_list); ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip); if (ipcp->peer_ip.s_addr == INADDR_ANY) { log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src); return 0; } ipcp->cfg.peer_range.ipaddr.s_addr = ipcp->peer_ip.s_addr; ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST; ipcp->cfg.peer_range.width = 32; } else { log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr); return 0; } } else if (ParseAddr(ipcp, hisaddr, &ipcp->cfg.peer_range.ipaddr, &ipcp->cfg.peer_range.mask, &ipcp->cfg.peer_range.width) != 0) { ipcp->peer_ip.s_addr = ipcp->cfg.peer_range.ipaddr.s_addr; if (setaddr && ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr, ipcp->cfg.peer_range.ipaddr, 0) < 0) return 0; } else return 0; bundle_AdjustFilters(bundle, NULL, &ipcp->peer_ip); return 1; /* Ok */ } struct in_addr addr2mask(struct in_addr addr) { u_int32_t haddr = ntohl(addr.s_addr); haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET : IN_CLASSB(haddr) ? IN_CLASSB_NET : IN_CLASSC_NET; addr.s_addr = htonl(haddr); return addr; }