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lwip_ipcp.c
00001 /* 00002 * ipcp.c - PPP IP Control Protocol. 00003 * 00004 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 00005 * 00006 * Redistribution and use in source and binary forms, with or without 00007 * modification, are permitted provided that the following conditions 00008 * are met: 00009 * 00010 * 1. Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * 00013 * 2. Redistributions in binary form must reproduce the above copyright 00014 * notice, this list of conditions and the following disclaimer in 00015 * the documentation and/or other materials provided with the 00016 * distribution. 00017 * 00018 * 3. The name "Carnegie Mellon University" must not be used to 00019 * endorse or promote products derived from this software without 00020 * prior written permission. For permission or any legal 00021 * details, please contact 00022 * Office of Technology Transfer 00023 * Carnegie Mellon University 00024 * 5000 Forbes Avenue 00025 * Pittsburgh, PA 15213-3890 00026 * (412) 268-4387, fax: (412) 268-7395 00027 * tech-transfer@andrew.cmu.edu 00028 * 00029 * 4. Redistributions of any form whatsoever must retain the following 00030 * acknowledgment: 00031 * "This product includes software developed by Computing Services 00032 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 00033 * 00034 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 00035 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 00036 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 00037 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 00038 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 00039 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 00040 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 00041 */ 00042 00043 #include "netif/ppp/ppp_opts.h" 00044 #if PPP_SUPPORT && PPP_IPV4_SUPPORT /* don't build if not configured for use in lwipopts.h */ 00045 00046 /* 00047 * @todo: 00048 */ 00049 00050 #if 0 /* UNUSED */ 00051 #include <stdio.h> 00052 #include <string.h> 00053 #include <stdlib.h> 00054 #include <netdb.h> 00055 #include <sys/param.h> 00056 #include <sys/types.h> 00057 #include <sys/socket.h> 00058 #include <netinet/in.h> 00059 #include <arpa/inet.h> 00060 #endif /* UNUSED */ 00061 00062 #include "netif/ppp/ppp_impl.h" 00063 00064 #include "netif/ppp/fsm.h" 00065 #include "netif/ppp/ipcp.h" 00066 00067 #if 0 /* UNUSED */ 00068 /* global vars */ 00069 u32_t netmask = 0; /* IP netmask to set on interface */ 00070 #endif /* UNUSED */ 00071 00072 #if 0 /* UNUSED */ 00073 bool disable_defaultip = 0; /* Don't use hostname for default IP adrs */ 00074 #endif /* UNUSED */ 00075 00076 #if 0 /* moved to ppp_settings */ 00077 bool noremoteip = 0; /* Let him have no IP address */ 00078 #endif /* moved to ppp_setting */ 00079 00080 #if 0 /* UNUSED */ 00081 /* Hook for a plugin to know when IP protocol has come up */ 00082 void (*ip_up_hook) (void) = NULL; 00083 00084 /* Hook for a plugin to know when IP protocol has come down */ 00085 void (*ip_down_hook) (void) = NULL; 00086 00087 /* Hook for a plugin to choose the remote IP address */ 00088 void (*ip_choose_hook) (u32_t *) = NULL; 00089 #endif /* UNUSED */ 00090 00091 #if PPP_NOTIFY 00092 /* Notifiers for when IPCP goes up and down */ 00093 struct notifier *ip_up_notifier = NULL; 00094 struct notifier *ip_down_notifier = NULL; 00095 #endif /* PPP_NOTIFY */ 00096 00097 /* local vars */ 00098 #if 0 /* moved to ppp_pcb */ 00099 static int default_route_set[NUM_PPP]; /* Have set up a default route */ 00100 static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */ 00101 static int ipcp_is_up; /* have called np_up() */ 00102 static int ipcp_is_open; /* haven't called np_finished() */ 00103 static bool ask_for_local; /* request our address from peer */ 00104 #endif /* moved to ppp_pcb */ 00105 #if 0 /* UNUSED */ 00106 static char vj_value[8]; /* string form of vj option value */ 00107 static char netmask_str[20]; /* string form of netmask value */ 00108 #endif /* UNUSED */ 00109 00110 /* 00111 * Callbacks for fsm code. (CI = Configuration Information) 00112 */ 00113 static void ipcp_resetci(fsm *f); /* Reset our CI */ 00114 static int ipcp_cilen(fsm *f); /* Return length of our CI */ 00115 static void ipcp_addci(fsm *f, u_char *ucp, int *lenp); /* Add our CI */ 00116 static int ipcp_ackci(fsm *f, u_char *p, int len); /* Peer ack'd our CI */ 00117 static int ipcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject);/* Peer nak'd our CI */ 00118 static int ipcp_rejci(fsm *f, u_char *p, int len); /* Peer rej'd our CI */ 00119 static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree); /* Rcv CI */ 00120 static void ipcp_up(fsm *f); /* We're UP */ 00121 static void ipcp_down(fsm *f); /* We're DOWN */ 00122 static void ipcp_finished(fsm *f); /* Don't need lower layer */ 00123 00124 static const fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */ 00125 ipcp_resetci, /* Reset our Configuration Information */ 00126 ipcp_cilen, /* Length of our Configuration Information */ 00127 ipcp_addci, /* Add our Configuration Information */ 00128 ipcp_ackci, /* ACK our Configuration Information */ 00129 ipcp_nakci, /* NAK our Configuration Information */ 00130 ipcp_rejci, /* Reject our Configuration Information */ 00131 ipcp_reqci, /* Request peer's Configuration Information */ 00132 ipcp_up, /* Called when fsm reaches OPENED state */ 00133 ipcp_down, /* Called when fsm leaves OPENED state */ 00134 NULL, /* Called when we want the lower layer up */ 00135 ipcp_finished, /* Called when we want the lower layer down */ 00136 NULL, /* Called when Protocol-Reject received */ 00137 NULL, /* Retransmission is necessary */ 00138 NULL, /* Called to handle protocol-specific codes */ 00139 "IPCP" /* String name of protocol */ 00140 }; 00141 00142 /* 00143 * Command-line options. 00144 */ 00145 #if PPP_OPTIONS 00146 static int setvjslots (char **); 00147 static int setdnsaddr (char **); 00148 static int setwinsaddr (char **); 00149 static int setnetmask (char **); 00150 int setipaddr (char *, char **, int); 00151 00152 static void printipaddr (option_t *, void (*)(void *, char *,...),void *); 00153 00154 static option_t ipcp_option_list[] = { 00155 { "noip", o_bool, &ipcp_protent.enabled_flag, 00156 "Disable IP and IPCP" }, 00157 { "-ip", o_bool, &ipcp_protent.enabled_flag, 00158 "Disable IP and IPCP", OPT_ALIAS }, 00159 00160 { "novj", o_bool, &ipcp_wantoptions[0].neg_vj, 00161 "Disable VJ compression", OPT_A2CLR, &ipcp_allowoptions[0].neg_vj }, 00162 { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj, 00163 "Disable VJ compression", OPT_ALIAS | OPT_A2CLR, 00164 &ipcp_allowoptions[0].neg_vj }, 00165 00166 { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag, 00167 "Disable VJ connection-ID compression", OPT_A2CLR, 00168 &ipcp_allowoptions[0].cflag }, 00169 { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag, 00170 "Disable VJ connection-ID compression", OPT_ALIAS | OPT_A2CLR, 00171 &ipcp_allowoptions[0].cflag }, 00172 00173 { "vj-max-slots", o_special, (void *)setvjslots, 00174 "Set maximum VJ header slots", 00175 OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, vj_value }, 00176 00177 { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local, 00178 "Accept peer's address for us", 1 }, 00179 { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote, 00180 "Accept peer's address for it", 1 }, 00181 00182 { "ipparam", o_string, &ipparam, 00183 "Set ip script parameter", OPT_PRIO }, 00184 00185 { "noipdefault", o_bool, &disable_defaultip, 00186 "Don't use name for default IP adrs", 1 }, 00187 00188 { "ms-dns", 1, (void *)setdnsaddr, 00189 "DNS address for the peer's use" }, 00190 { "ms-wins", 1, (void *)setwinsaddr, 00191 "Nameserver for SMB over TCP/IP for peer" }, 00192 00193 { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime, 00194 "Set timeout for IPCP", OPT_PRIO }, 00195 { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits, 00196 "Set max #xmits for term-reqs", OPT_PRIO }, 00197 { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits, 00198 "Set max #xmits for conf-reqs", OPT_PRIO }, 00199 { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops, 00200 "Set max #conf-naks for IPCP", OPT_PRIO }, 00201 00202 { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route, 00203 "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route }, 00204 { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route, 00205 "disable defaultroute option", OPT_A2CLR, 00206 &ipcp_wantoptions[0].default_route }, 00207 { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route, 00208 "disable defaultroute option", OPT_ALIAS | OPT_A2CLR, 00209 &ipcp_wantoptions[0].default_route }, 00210 00211 { "replacedefaultroute", o_bool, 00212 &ipcp_wantoptions[0].replace_default_route, 00213 "Replace default route", 1 00214 }, 00215 { "noreplacedefaultroute", o_bool, 00216 &ipcp_allowoptions[0].replace_default_route, 00217 "Never replace default route", OPT_A2COPY, 00218 &ipcp_wantoptions[0].replace_default_route }, 00219 { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp, 00220 "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp }, 00221 { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp, 00222 "disable proxyarp option", OPT_A2CLR, 00223 &ipcp_wantoptions[0].proxy_arp }, 00224 { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp, 00225 "disable proxyarp option", OPT_ALIAS | OPT_A2CLR, 00226 &ipcp_wantoptions[0].proxy_arp }, 00227 00228 { "usepeerdns", o_bool, &usepeerdns, 00229 "Ask peer for DNS address(es)", 1 }, 00230 00231 { "netmask", o_special, (void *)setnetmask, 00232 "set netmask", OPT_PRIO | OPT_A2STRVAL | OPT_STATIC, netmask_str }, 00233 00234 { "ipcp-no-addresses", o_bool, &ipcp_wantoptions[0].old_addrs, 00235 "Disable old-style IP-Addresses usage", OPT_A2CLR, 00236 &ipcp_allowoptions[0].old_addrs }, 00237 { "ipcp-no-address", o_bool, &ipcp_wantoptions[0].neg_addr, 00238 "Disable IP-Address usage", OPT_A2CLR, 00239 &ipcp_allowoptions[0].neg_addr }, 00240 00241 { "noremoteip", o_bool, &noremoteip, 00242 "Allow peer to have no IP address", 1 }, 00243 00244 { "nosendip", o_bool, &ipcp_wantoptions[0].neg_addr, 00245 "Don't send our IP address to peer", OPT_A2CLR, 00246 &ipcp_wantoptions[0].old_addrs}, 00247 00248 { "IP addresses", o_wild, (void *) &setipaddr, 00249 "set local and remote IP addresses", 00250 OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr }, 00251 00252 { NULL } 00253 }; 00254 #endif /* PPP_OPTIONS */ 00255 00256 /* 00257 * Protocol entry points from main code. 00258 */ 00259 static void ipcp_init(ppp_pcb *pcb); 00260 static void ipcp_open(ppp_pcb *pcb); 00261 static void ipcp_close(ppp_pcb *pcb, const char *reason); 00262 static void ipcp_lowerup(ppp_pcb *pcb); 00263 static void ipcp_lowerdown(ppp_pcb *pcb); 00264 static void ipcp_input(ppp_pcb *pcb, u_char *p, int len); 00265 static void ipcp_protrej(ppp_pcb *pcb); 00266 #if PRINTPKT_SUPPORT 00267 static int ipcp_printpkt(const u_char *p, int plen, 00268 void (*printer) (void *, const char *, ...), void *arg); 00269 #endif /* PRINTPKT_SUPPORT */ 00270 #if PPP_OPTIONS 00271 static void ip_check_options (void); 00272 #endif /* PPP_OPTIONS */ 00273 #if DEMAND_SUPPORT 00274 static int ip_demand_conf (int); 00275 static int ip_active_pkt (u_char *, int); 00276 #endif /* DEMAND_SUPPORT */ 00277 #if 0 /* UNUSED */ 00278 static void create_resolv (u32_t, u32_t); 00279 #endif /* UNUSED */ 00280 00281 const struct protent ipcp_protent = { 00282 PPP_IPCP, 00283 ipcp_init, 00284 ipcp_input, 00285 ipcp_protrej, 00286 ipcp_lowerup, 00287 ipcp_lowerdown, 00288 ipcp_open, 00289 ipcp_close, 00290 #if PRINTPKT_SUPPORT 00291 ipcp_printpkt, 00292 #endif /* PRINTPKT_SUPPORT */ 00293 #if PPP_DATAINPUT 00294 NULL, 00295 #endif /* PPP_DATAINPUT */ 00296 #if PRINTPKT_SUPPORT 00297 "IPCP", 00298 "IP", 00299 #endif /* PRINTPKT_SUPPORT */ 00300 #if PPP_OPTIONS 00301 ipcp_option_list, 00302 ip_check_options, 00303 #endif /* PPP_OPTIONS */ 00304 #if DEMAND_SUPPORT 00305 ip_demand_conf, 00306 ip_active_pkt 00307 #endif /* DEMAND_SUPPORT */ 00308 }; 00309 00310 static void ipcp_clear_addrs(ppp_pcb *pcb, u32_t ouraddr, u32_t hisaddr, u8_t replacedefaultroute); 00311 00312 /* 00313 * Lengths of configuration options. 00314 */ 00315 #define CILEN_VOID 2 00316 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */ 00317 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */ 00318 #define CILEN_ADDR 6 /* new-style single address option */ 00319 #define CILEN_ADDRS 10 /* old-style dual address option */ 00320 00321 00322 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ 00323 (x) == CONFNAK ? "NAK" : "REJ") 00324 00325 #if 0 /* UNUSED, already defined by lwIP */ 00326 /* 00327 * Make a string representation of a network IP address. 00328 */ 00329 char * 00330 ip_ntoa(ipaddr) 00331 u32_t ipaddr; 00332 { 00333 static char b[64]; 00334 00335 slprintf(b, sizeof(b), "%I", ipaddr); 00336 return b; 00337 } 00338 #endif /* UNUSED, already defined by lwIP */ 00339 00340 /* 00341 * Option parsing. 00342 */ 00343 #if PPP_OPTIONS 00344 /* 00345 * setvjslots - set maximum number of connection slots for VJ compression 00346 */ 00347 static int 00348 setvjslots(argv) 00349 char **argv; 00350 { 00351 int value; 00352 00353 if (!int_option(*argv, &value)) 00354 return 0; 00355 00356 if (value < 2 || value > 16) { 00357 option_error("vj-max-slots value must be between 2 and 16"); 00358 return 0; 00359 } 00360 ipcp_wantoptions [0].maxslotindex = 00361 ipcp_allowoptions[0].maxslotindex = value - 1; 00362 slprintf(vj_value, sizeof(vj_value), "%d", value); 00363 return 1; 00364 } 00365 00366 /* 00367 * setdnsaddr - set the dns address(es) 00368 */ 00369 static int 00370 setdnsaddr(argv) 00371 char **argv; 00372 { 00373 u32_t dns; 00374 struct hostent *hp; 00375 00376 dns = inet_addr(*argv); 00377 if (dns == (u32_t) -1) { 00378 if ((hp = gethostbyname(*argv)) == NULL) { 00379 option_error("invalid address parameter '%s' for ms-dns option", 00380 *argv); 00381 return 0; 00382 } 00383 dns = *(u32_t *)hp->h_addr; 00384 } 00385 00386 /* We take the last 2 values given, the 2nd-last as the primary 00387 and the last as the secondary. If only one is given it 00388 becomes both primary and secondary. */ 00389 if (ipcp_allowoptions[0].dnsaddr[1] == 0) 00390 ipcp_allowoptions[0].dnsaddr[0] = dns; 00391 else 00392 ipcp_allowoptions[0].dnsaddr[0] = ipcp_allowoptions[0].dnsaddr[1]; 00393 00394 /* always set the secondary address value. */ 00395 ipcp_allowoptions[0].dnsaddr[1] = dns; 00396 00397 return (1); 00398 } 00399 00400 /* 00401 * setwinsaddr - set the wins address(es) 00402 * This is primrarly used with the Samba package under UNIX or for pointing 00403 * the caller to the existing WINS server on a Windows NT platform. 00404 */ 00405 static int 00406 setwinsaddr(argv) 00407 char **argv; 00408 { 00409 u32_t wins; 00410 struct hostent *hp; 00411 00412 wins = inet_addr(*argv); 00413 if (wins == (u32_t) -1) { 00414 if ((hp = gethostbyname(*argv)) == NULL) { 00415 option_error("invalid address parameter '%s' for ms-wins option", 00416 *argv); 00417 return 0; 00418 } 00419 wins = *(u32_t *)hp->h_addr; 00420 } 00421 00422 /* We take the last 2 values given, the 2nd-last as the primary 00423 and the last as the secondary. If only one is given it 00424 becomes both primary and secondary. */ 00425 if (ipcp_allowoptions[0].winsaddr[1] == 0) 00426 ipcp_allowoptions[0].winsaddr[0] = wins; 00427 else 00428 ipcp_allowoptions[0].winsaddr[0] = ipcp_allowoptions[0].winsaddr[1]; 00429 00430 /* always set the secondary address value. */ 00431 ipcp_allowoptions[0].winsaddr[1] = wins; 00432 00433 return (1); 00434 } 00435 00436 /* 00437 * setipaddr - Set the IP address 00438 * If doit is 0, the call is to check whether this option is 00439 * potentially an IP address specification. 00440 * Not static so that plugins can call it to set the addresses 00441 */ 00442 int 00443 setipaddr(arg, argv, doit) 00444 char *arg; 00445 char **argv; 00446 int doit; 00447 { 00448 struct hostent *hp; 00449 char *colon; 00450 u32_t local, remote; 00451 ipcp_options *wo = &ipcp_wantoptions[0]; 00452 static int prio_local = 0, prio_remote = 0; 00453 00454 /* 00455 * IP address pair separated by ":". 00456 */ 00457 if ((colon = strchr(arg, ':')) == NULL) 00458 return 0; 00459 if (!doit) 00460 return 1; 00461 00462 /* 00463 * If colon first character, then no local addr. 00464 */ 00465 if (colon != arg && option_priority >= prio_local) { 00466 *colon = '\0'; 00467 if ((local = inet_addr(arg)) == (u32_t) -1) { 00468 if ((hp = gethostbyname(arg)) == NULL) { 00469 option_error("unknown host: %s", arg); 00470 return 0; 00471 } 00472 local = *(u32_t *)hp->h_addr; 00473 } 00474 if (bad_ip_adrs(local)) { 00475 option_error("bad local IP address %s", ip_ntoa(local)); 00476 return 0; 00477 } 00478 if (local != 0) 00479 wo->ouraddr = local; 00480 *colon = ':'; 00481 prio_local = option_priority; 00482 } 00483 00484 /* 00485 * If colon last character, then no remote addr. 00486 */ 00487 if (*++colon != '\0' && option_priority >= prio_remote) { 00488 if ((remote = inet_addr(colon)) == (u32_t) -1) { 00489 if ((hp = gethostbyname(colon)) == NULL) { 00490 option_error("unknown host: %s", colon); 00491 return 0; 00492 } 00493 remote = *(u32_t *)hp->h_addr; 00494 if (remote_name[0] == 0) 00495 strlcpy(remote_name, colon, sizeof(remote_name)); 00496 } 00497 if (bad_ip_adrs(remote)) { 00498 option_error("bad remote IP address %s", ip_ntoa(remote)); 00499 return 0; 00500 } 00501 if (remote != 0) 00502 wo->hisaddr = remote; 00503 prio_remote = option_priority; 00504 } 00505 00506 return 1; 00507 } 00508 00509 static void 00510 printipaddr(opt, printer, arg) 00511 option_t *opt; 00512 void (*printer) (void *, char *, ...); 00513 void *arg; 00514 { 00515 ipcp_options *wo = &ipcp_wantoptions[0]; 00516 00517 if (wo->ouraddr != 0) 00518 printer(arg, "%I", wo->ouraddr); 00519 printer(arg, ":"); 00520 if (wo->hisaddr != 0) 00521 printer(arg, "%I", wo->hisaddr); 00522 } 00523 00524 /* 00525 * setnetmask - set the netmask to be used on the interface. 00526 */ 00527 static int 00528 setnetmask(argv) 00529 char **argv; 00530 { 00531 u32_t mask; 00532 int n; 00533 char *p; 00534 00535 /* 00536 * Unfortunately, if we use inet_addr, we can't tell whether 00537 * a result of all 1s is an error or a valid 255.255.255.255. 00538 */ 00539 p = *argv; 00540 n = parse_dotted_ip(p, &mask); 00541 00542 mask = lwip_htonl(mask); 00543 00544 if (n == 0 || p[n] != 0 || (netmask & ~mask) != 0) { 00545 option_error("invalid netmask value '%s'", *argv); 00546 return 0; 00547 } 00548 00549 netmask = mask; 00550 slprintf(netmask_str, sizeof(netmask_str), "%I", mask); 00551 00552 return (1); 00553 } 00554 00555 int 00556 parse_dotted_ip(p, vp) 00557 char *p; 00558 u32_t *vp; 00559 { 00560 int n; 00561 u32_t v, b; 00562 char *endp, *p0 = p; 00563 00564 v = 0; 00565 for (n = 3;; --n) { 00566 b = strtoul(p, &endp, 0); 00567 if (endp == p) 00568 return 0; 00569 if (b > 255) { 00570 if (n < 3) 00571 return 0; 00572 /* accept e.g. 0xffffff00 */ 00573 *vp = b; 00574 return endp - p0; 00575 } 00576 v |= b << (n * 8); 00577 p = endp; 00578 if (n == 0) 00579 break; 00580 if (*p != '.') 00581 return 0; 00582 ++p; 00583 } 00584 *vp = v; 00585 return p - p0; 00586 } 00587 #endif /* PPP_OPTIONS */ 00588 00589 /* 00590 * ipcp_init - Initialize IPCP. 00591 */ 00592 static void ipcp_init(ppp_pcb *pcb) { 00593 fsm *f = &pcb->ipcp_fsm; 00594 00595 ipcp_options *wo = &pcb->ipcp_wantoptions; 00596 ipcp_options *ao = &pcb->ipcp_allowoptions; 00597 00598 f->pcb = pcb; 00599 f->protocol = PPP_IPCP; 00600 f->callbacks = &ipcp_callbacks; 00601 fsm_init(f); 00602 00603 /* 00604 * Some 3G modems use repeated IPCP NAKs as a way of stalling 00605 * until they can contact a server on the network, so we increase 00606 * the default number of NAKs we accept before we start treating 00607 * them as rejects. 00608 */ 00609 f->maxnakloops = 100; 00610 00611 #if 0 /* Not necessary, everything is cleared in ppp_new() */ 00612 memset(wo, 0, sizeof(*wo)); 00613 memset(ao, 0, sizeof(*ao)); 00614 #endif /* 0 */ 00615 00616 wo->neg_addr = wo->old_addrs = 1; 00617 #if VJ_SUPPORT 00618 wo->neg_vj = 1; 00619 wo->vj_protocol = IPCP_VJ_COMP; 00620 wo->maxslotindex = MAX_STATES - 1; /* really max index */ 00621 wo->cflag = 1; 00622 #endif /* VJ_SUPPORT */ 00623 00624 #if 0 /* UNUSED */ 00625 /* wanting default route by default */ 00626 wo->default_route = 1; 00627 #endif /* UNUSED */ 00628 00629 ao->neg_addr = ao->old_addrs = 1; 00630 #if VJ_SUPPORT 00631 /* max slots and slot-id compression are currently hardwired in */ 00632 /* ppp_if.c to 16 and 1, this needs to be changed (among other */ 00633 /* things) gmc */ 00634 00635 ao->neg_vj = 1; 00636 ao->maxslotindex = MAX_STATES - 1; 00637 ao->cflag = 1; 00638 #endif /* #if VJ_SUPPORT */ 00639 00640 #if 0 /* UNUSED */ 00641 /* 00642 * XXX These control whether the user may use the proxyarp 00643 * and defaultroute options. 00644 */ 00645 ao->proxy_arp = 1; 00646 ao->default_route = 1; 00647 #endif /* UNUSED */ 00648 } 00649 00650 00651 /* 00652 * ipcp_open - IPCP is allowed to come up. 00653 */ 00654 static void ipcp_open(ppp_pcb *pcb) { 00655 fsm *f = &pcb->ipcp_fsm; 00656 fsm_open(f); 00657 pcb->ipcp_is_open = 1; 00658 } 00659 00660 00661 /* 00662 * ipcp_close - Take IPCP down. 00663 */ 00664 static void ipcp_close(ppp_pcb *pcb, const char *reason) { 00665 fsm *f = &pcb->ipcp_fsm; 00666 fsm_close(f, reason); 00667 } 00668 00669 00670 /* 00671 * ipcp_lowerup - The lower layer is up. 00672 */ 00673 static void ipcp_lowerup(ppp_pcb *pcb) { 00674 fsm *f = &pcb->ipcp_fsm; 00675 fsm_lowerup(f); 00676 } 00677 00678 00679 /* 00680 * ipcp_lowerdown - The lower layer is down. 00681 */ 00682 static void ipcp_lowerdown(ppp_pcb *pcb) { 00683 fsm *f = &pcb->ipcp_fsm; 00684 fsm_lowerdown(f); 00685 } 00686 00687 00688 /* 00689 * ipcp_input - Input IPCP packet. 00690 */ 00691 static void ipcp_input(ppp_pcb *pcb, u_char *p, int len) { 00692 fsm *f = &pcb->ipcp_fsm; 00693 fsm_input(f, p, len); 00694 } 00695 00696 00697 /* 00698 * ipcp_protrej - A Protocol-Reject was received for IPCP. 00699 * 00700 * Pretend the lower layer went down, so we shut up. 00701 */ 00702 static void ipcp_protrej(ppp_pcb *pcb) { 00703 fsm *f = &pcb->ipcp_fsm; 00704 fsm_lowerdown(f); 00705 } 00706 00707 00708 /* 00709 * ipcp_resetci - Reset our CI. 00710 * Called by fsm_sconfreq, Send Configure Request. 00711 */ 00712 static void ipcp_resetci(fsm *f) { 00713 ppp_pcb *pcb = f->pcb; 00714 ipcp_options *wo = &pcb->ipcp_wantoptions; 00715 ipcp_options *go = &pcb->ipcp_gotoptions; 00716 ipcp_options *ao = &pcb->ipcp_allowoptions; 00717 00718 wo->req_addr = (wo->neg_addr || wo->old_addrs) && 00719 (ao->neg_addr || ao->old_addrs); 00720 if (wo->ouraddr == 0) 00721 wo->accept_local = 1; 00722 if (wo->hisaddr == 0) 00723 wo->accept_remote = 1; 00724 #if LWIP_DNS 00725 wo->req_dns1 = wo->req_dns2 = pcb->settings.usepeerdns; /* Request DNS addresses from the peer */ 00726 #endif /* LWIP_DNS */ 00727 *go = *wo; 00728 if (!pcb->ask_for_local) 00729 go->ouraddr = 0; 00730 #if 0 /* UNUSED */ 00731 if (ip_choose_hook) { 00732 ip_choose_hook(&wo->hisaddr); 00733 if (wo->hisaddr) { 00734 wo->accept_remote = 0; 00735 } 00736 } 00737 #endif /* UNUSED */ 00738 BZERO(&pcb->ipcp_hisoptions, sizeof(ipcp_options)); 00739 } 00740 00741 00742 /* 00743 * ipcp_cilen - Return length of our CI. 00744 * Called by fsm_sconfreq, Send Configure Request. 00745 */ 00746 static int ipcp_cilen(fsm *f) { 00747 ppp_pcb *pcb = f->pcb; 00748 ipcp_options *go = &pcb->ipcp_gotoptions; 00749 #if VJ_SUPPORT 00750 ipcp_options *wo = &pcb->ipcp_wantoptions; 00751 #endif /* VJ_SUPPORT */ 00752 ipcp_options *ho = &pcb->ipcp_hisoptions; 00753 00754 #define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0) 00755 #if VJ_SUPPORT 00756 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) 00757 #endif /* VJ_SUPPORT */ 00758 #define LENCIADDR(neg) (neg ? CILEN_ADDR : 0) 00759 #if LWIP_DNS 00760 #define LENCIDNS(neg) LENCIADDR(neg) 00761 #endif /* LWIP_DNS */ 00762 #if 0 /* UNUSED - WINS */ 00763 #define LENCIWINS(neg) LENCIADDR(neg) 00764 #endif /* UNUSED - WINS */ 00765 00766 /* 00767 * First see if we want to change our options to the old 00768 * forms because we have received old forms from the peer. 00769 */ 00770 if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs) 00771 go->neg_addr = 0; 00772 00773 #if VJ_SUPPORT 00774 if (wo->neg_vj && !go->neg_vj && !go->old_vj) { 00775 /* try an older style of VJ negotiation */ 00776 /* use the old style only if the peer did */ 00777 if (ho->neg_vj && ho->old_vj) { 00778 go->neg_vj = 1; 00779 go->old_vj = 1; 00780 go->vj_protocol = ho->vj_protocol; 00781 } 00782 } 00783 #endif /* VJ_SUPPORT */ 00784 00785 return (LENCIADDRS(!go->neg_addr && go->old_addrs) + 00786 #if VJ_SUPPORT 00787 LENCIVJ(go->neg_vj, go->old_vj) + 00788 #endif /* VJ_SUPPORT */ 00789 LENCIADDR(go->neg_addr) + 00790 #if LWIP_DNS 00791 LENCIDNS(go->req_dns1) + 00792 LENCIDNS(go->req_dns2) + 00793 #endif /* LWIP_DNS */ 00794 #if 0 /* UNUSED - WINS */ 00795 LENCIWINS(go->winsaddr[0]) + 00796 LENCIWINS(go->winsaddr[1]) + 00797 #endif /* UNUSED - WINS */ 00798 0); 00799 } 00800 00801 00802 /* 00803 * ipcp_addci - Add our desired CIs to a packet. 00804 * Called by fsm_sconfreq, Send Configure Request. 00805 */ 00806 static void ipcp_addci(fsm *f, u_char *ucp, int *lenp) { 00807 ppp_pcb *pcb = f->pcb; 00808 ipcp_options *go = &pcb->ipcp_gotoptions; 00809 int len = *lenp; 00810 00811 #define ADDCIADDRS(opt, neg, val1, val2) \ 00812 if (neg) { \ 00813 if (len >= CILEN_ADDRS) { \ 00814 u32_t l; \ 00815 PUTCHAR(opt, ucp); \ 00816 PUTCHAR(CILEN_ADDRS, ucp); \ 00817 l = lwip_ntohl(val1); \ 00818 PUTLONG(l, ucp); \ 00819 l = lwip_ntohl(val2); \ 00820 PUTLONG(l, ucp); \ 00821 len -= CILEN_ADDRS; \ 00822 } else \ 00823 go->old_addrs = 0; \ 00824 } 00825 00826 #if VJ_SUPPORT 00827 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \ 00828 if (neg) { \ 00829 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ 00830 if (len >= vjlen) { \ 00831 PUTCHAR(opt, ucp); \ 00832 PUTCHAR(vjlen, ucp); \ 00833 PUTSHORT(val, ucp); \ 00834 if (!old) { \ 00835 PUTCHAR(maxslotindex, ucp); \ 00836 PUTCHAR(cflag, ucp); \ 00837 } \ 00838 len -= vjlen; \ 00839 } else \ 00840 neg = 0; \ 00841 } 00842 #endif /* VJ_SUPPORT */ 00843 00844 #define ADDCIADDR(opt, neg, val) \ 00845 if (neg) { \ 00846 if (len >= CILEN_ADDR) { \ 00847 u32_t l; \ 00848 PUTCHAR(opt, ucp); \ 00849 PUTCHAR(CILEN_ADDR, ucp); \ 00850 l = lwip_ntohl(val); \ 00851 PUTLONG(l, ucp); \ 00852 len -= CILEN_ADDR; \ 00853 } else \ 00854 neg = 0; \ 00855 } 00856 00857 #if LWIP_DNS 00858 #define ADDCIDNS(opt, neg, addr) \ 00859 if (neg) { \ 00860 if (len >= CILEN_ADDR) { \ 00861 u32_t l; \ 00862 PUTCHAR(opt, ucp); \ 00863 PUTCHAR(CILEN_ADDR, ucp); \ 00864 l = lwip_ntohl(addr); \ 00865 PUTLONG(l, ucp); \ 00866 len -= CILEN_ADDR; \ 00867 } else \ 00868 neg = 0; \ 00869 } 00870 #endif /* LWIP_DNS */ 00871 00872 #if 0 /* UNUSED - WINS */ 00873 #define ADDCIWINS(opt, addr) \ 00874 if (addr) { \ 00875 if (len >= CILEN_ADDR) { \ 00876 u32_t l; \ 00877 PUTCHAR(opt, ucp); \ 00878 PUTCHAR(CILEN_ADDR, ucp); \ 00879 l = lwip_ntohl(addr); \ 00880 PUTLONG(l, ucp); \ 00881 len -= CILEN_ADDR; \ 00882 } else \ 00883 addr = 0; \ 00884 } 00885 #endif /* UNUSED - WINS */ 00886 00887 ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr, 00888 go->hisaddr); 00889 00890 #if VJ_SUPPORT 00891 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, 00892 go->maxslotindex, go->cflag); 00893 #endif /* VJ_SUPPORT */ 00894 00895 ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr); 00896 00897 #if LWIP_DNS 00898 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); 00899 00900 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); 00901 #endif /* LWIP_DNS */ 00902 00903 #if 0 /* UNUSED - WINS */ 00904 ADDCIWINS(CI_MS_WINS1, go->winsaddr[0]); 00905 00906 ADDCIWINS(CI_MS_WINS2, go->winsaddr[1]); 00907 #endif /* UNUSED - WINS */ 00908 00909 *lenp -= len; 00910 } 00911 00912 00913 /* 00914 * ipcp_ackci - Ack our CIs. 00915 * Called by fsm_rconfack, Receive Configure ACK. 00916 * 00917 * Returns: 00918 * 0 - Ack was bad. 00919 * 1 - Ack was good. 00920 */ 00921 static int ipcp_ackci(fsm *f, u_char *p, int len) { 00922 ppp_pcb *pcb = f->pcb; 00923 ipcp_options *go = &pcb->ipcp_gotoptions; 00924 u_short cilen, citype; 00925 u32_t cilong; 00926 #if VJ_SUPPORT 00927 u_short cishort; 00928 u_char cimaxslotindex, cicflag; 00929 #endif /* VJ_SUPPORT */ 00930 00931 /* 00932 * CIs must be in exactly the same order that we sent... 00933 * Check packet length and CI length at each step. 00934 * If we find any deviations, then this packet is bad. 00935 */ 00936 00937 #define ACKCIADDRS(opt, neg, val1, val2) \ 00938 if (neg) { \ 00939 u32_t l; \ 00940 if ((len -= CILEN_ADDRS) < 0) \ 00941 goto bad; \ 00942 GETCHAR(citype, p); \ 00943 GETCHAR(cilen, p); \ 00944 if (cilen != CILEN_ADDRS || \ 00945 citype != opt) \ 00946 goto bad; \ 00947 GETLONG(l, p); \ 00948 cilong = lwip_htonl(l); \ 00949 if (val1 != cilong) \ 00950 goto bad; \ 00951 GETLONG(l, p); \ 00952 cilong = lwip_htonl(l); \ 00953 if (val2 != cilong) \ 00954 goto bad; \ 00955 } 00956 00957 #if VJ_SUPPORT 00958 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \ 00959 if (neg) { \ 00960 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ 00961 if ((len -= vjlen) < 0) \ 00962 goto bad; \ 00963 GETCHAR(citype, p); \ 00964 GETCHAR(cilen, p); \ 00965 if (cilen != vjlen || \ 00966 citype != opt) \ 00967 goto bad; \ 00968 GETSHORT(cishort, p); \ 00969 if (cishort != val) \ 00970 goto bad; \ 00971 if (!old) { \ 00972 GETCHAR(cimaxslotindex, p); \ 00973 if (cimaxslotindex != maxslotindex) \ 00974 goto bad; \ 00975 GETCHAR(cicflag, p); \ 00976 if (cicflag != cflag) \ 00977 goto bad; \ 00978 } \ 00979 } 00980 #endif /* VJ_SUPPORT */ 00981 00982 #define ACKCIADDR(opt, neg, val) \ 00983 if (neg) { \ 00984 u32_t l; \ 00985 if ((len -= CILEN_ADDR) < 0) \ 00986 goto bad; \ 00987 GETCHAR(citype, p); \ 00988 GETCHAR(cilen, p); \ 00989 if (cilen != CILEN_ADDR || \ 00990 citype != opt) \ 00991 goto bad; \ 00992 GETLONG(l, p); \ 00993 cilong = lwip_htonl(l); \ 00994 if (val != cilong) \ 00995 goto bad; \ 00996 } 00997 00998 #if LWIP_DNS 00999 #define ACKCIDNS(opt, neg, addr) \ 01000 if (neg) { \ 01001 u32_t l; \ 01002 if ((len -= CILEN_ADDR) < 0) \ 01003 goto bad; \ 01004 GETCHAR(citype, p); \ 01005 GETCHAR(cilen, p); \ 01006 if (cilen != CILEN_ADDR || citype != opt) \ 01007 goto bad; \ 01008 GETLONG(l, p); \ 01009 cilong = lwip_htonl(l); \ 01010 if (addr != cilong) \ 01011 goto bad; \ 01012 } 01013 #endif /* LWIP_DNS */ 01014 01015 #if 0 /* UNUSED - WINS */ 01016 #define ACKCIWINS(opt, addr) \ 01017 if (addr) { \ 01018 u32_t l; \ 01019 if ((len -= CILEN_ADDR) < 0) \ 01020 goto bad; \ 01021 GETCHAR(citype, p); \ 01022 GETCHAR(cilen, p); \ 01023 if (cilen != CILEN_ADDR || citype != opt) \ 01024 goto bad; \ 01025 GETLONG(l, p); \ 01026 cilong = lwip_htonl(l); \ 01027 if (addr != cilong) \ 01028 goto bad; \ 01029 } 01030 #endif /* UNUSED - WINS */ 01031 01032 ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr, 01033 go->hisaddr); 01034 01035 #if VJ_SUPPORT 01036 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, 01037 go->maxslotindex, go->cflag); 01038 #endif /* VJ_SUPPORT */ 01039 01040 ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr); 01041 01042 #if LWIP_DNS 01043 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); 01044 01045 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); 01046 #endif /* LWIP_DNS */ 01047 01048 #if 0 /* UNUSED - WINS */ 01049 ACKCIWINS(CI_MS_WINS1, go->winsaddr[0]); 01050 01051 ACKCIWINS(CI_MS_WINS2, go->winsaddr[1]); 01052 #endif /* UNUSED - WINS */ 01053 01054 /* 01055 * If there are any remaining CIs, then this packet is bad. 01056 */ 01057 if (len != 0) 01058 goto bad; 01059 return (1); 01060 01061 bad: 01062 IPCPDEBUG(("ipcp_ackci: received bad Ack!")); 01063 return (0); 01064 } 01065 01066 /* 01067 * ipcp_nakci - Peer has sent a NAK for some of our CIs. 01068 * This should not modify any state if the Nak is bad 01069 * or if IPCP is in the OPENED state. 01070 * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject. 01071 * 01072 * Returns: 01073 * 0 - Nak was bad. 01074 * 1 - Nak was good. 01075 */ 01076 static int ipcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) { 01077 ppp_pcb *pcb = f->pcb; 01078 ipcp_options *go = &pcb->ipcp_gotoptions; 01079 u_char citype, cilen, *next; 01080 #if VJ_SUPPORT 01081 u_char cimaxslotindex, cicflag; 01082 u_short cishort; 01083 #endif /* VJ_SUPPORT */ 01084 u32_t ciaddr1, ciaddr2, l; 01085 #if LWIP_DNS 01086 u32_t cidnsaddr; 01087 #endif /* LWIP_DNS */ 01088 ipcp_options no; /* options we've seen Naks for */ 01089 ipcp_options try_; /* options to request next time */ 01090 01091 BZERO(&no, sizeof(no)); 01092 try_ = *go; 01093 01094 /* 01095 * Any Nak'd CIs must be in exactly the same order that we sent. 01096 * Check packet length and CI length at each step. 01097 * If we find any deviations, then this packet is bad. 01098 */ 01099 #define NAKCIADDRS(opt, neg, code) \ 01100 if ((neg) && \ 01101 (cilen = p[1]) == CILEN_ADDRS && \ 01102 len >= cilen && \ 01103 p[0] == opt) { \ 01104 len -= cilen; \ 01105 INCPTR(2, p); \ 01106 GETLONG(l, p); \ 01107 ciaddr1 = lwip_htonl(l); \ 01108 GETLONG(l, p); \ 01109 ciaddr2 = lwip_htonl(l); \ 01110 no.old_addrs = 1; \ 01111 code \ 01112 } 01113 01114 #if VJ_SUPPORT 01115 #define NAKCIVJ(opt, neg, code) \ 01116 if (go->neg && \ 01117 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \ 01118 len >= cilen && \ 01119 p[0] == opt) { \ 01120 len -= cilen; \ 01121 INCPTR(2, p); \ 01122 GETSHORT(cishort, p); \ 01123 no.neg = 1; \ 01124 code \ 01125 } 01126 #endif /* VJ_SUPPORT */ 01127 01128 #define NAKCIADDR(opt, neg, code) \ 01129 if (go->neg && \ 01130 (cilen = p[1]) == CILEN_ADDR && \ 01131 len >= cilen && \ 01132 p[0] == opt) { \ 01133 len -= cilen; \ 01134 INCPTR(2, p); \ 01135 GETLONG(l, p); \ 01136 ciaddr1 = lwip_htonl(l); \ 01137 no.neg = 1; \ 01138 code \ 01139 } 01140 01141 #if LWIP_DNS 01142 #define NAKCIDNS(opt, neg, code) \ 01143 if (go->neg && \ 01144 ((cilen = p[1]) == CILEN_ADDR) && \ 01145 len >= cilen && \ 01146 p[0] == opt) { \ 01147 len -= cilen; \ 01148 INCPTR(2, p); \ 01149 GETLONG(l, p); \ 01150 cidnsaddr = lwip_htonl(l); \ 01151 no.neg = 1; \ 01152 code \ 01153 } 01154 #endif /* LWIP_DNS */ 01155 01156 /* 01157 * Accept the peer's idea of {our,his} address, if different 01158 * from our idea, only if the accept_{local,remote} flag is set. 01159 */ 01160 NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, 01161 if (treat_as_reject) { 01162 try_.old_addrs = 0; 01163 } else { 01164 if (go->accept_local && ciaddr1) { 01165 /* take his idea of our address */ 01166 try_.ouraddr = ciaddr1; 01167 } 01168 if (go->accept_remote && ciaddr2) { 01169 /* take his idea of his address */ 01170 try_.hisaddr = ciaddr2; 01171 } 01172 } 01173 ); 01174 01175 #if VJ_SUPPORT 01176 /* 01177 * Accept the peer's value of maxslotindex provided that it 01178 * is less than what we asked for. Turn off slot-ID compression 01179 * if the peer wants. Send old-style compress-type option if 01180 * the peer wants. 01181 */ 01182 NAKCIVJ(CI_COMPRESSTYPE, neg_vj, 01183 if (treat_as_reject) { 01184 try_.neg_vj = 0; 01185 } else if (cilen == CILEN_VJ) { 01186 GETCHAR(cimaxslotindex, p); 01187 GETCHAR(cicflag, p); 01188 if (cishort == IPCP_VJ_COMP) { 01189 try_.old_vj = 0; 01190 if (cimaxslotindex < go->maxslotindex) 01191 try_.maxslotindex = cimaxslotindex; 01192 if (!cicflag) 01193 try_.cflag = 0; 01194 } else { 01195 try_.neg_vj = 0; 01196 } 01197 } else { 01198 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) { 01199 try_.old_vj = 1; 01200 try_.vj_protocol = cishort; 01201 } else { 01202 try_.neg_vj = 0; 01203 } 01204 } 01205 ); 01206 #endif /* VJ_SUPPORT */ 01207 01208 NAKCIADDR(CI_ADDR, neg_addr, 01209 if (treat_as_reject) { 01210 try_.neg_addr = 0; 01211 try_.old_addrs = 0; 01212 } else if (go->accept_local && ciaddr1) { 01213 /* take his idea of our address */ 01214 try_.ouraddr = ciaddr1; 01215 } 01216 ); 01217 01218 #if LWIP_DNS 01219 NAKCIDNS(CI_MS_DNS1, req_dns1, 01220 if (treat_as_reject) { 01221 try_.req_dns1 = 0; 01222 } else { 01223 try_.dnsaddr[0] = cidnsaddr; 01224 } 01225 ); 01226 01227 NAKCIDNS(CI_MS_DNS2, req_dns2, 01228 if (treat_as_reject) { 01229 try_.req_dns2 = 0; 01230 } else { 01231 try_.dnsaddr[1] = cidnsaddr; 01232 } 01233 ); 01234 #endif /* #if LWIP_DNS */ 01235 01236 /* 01237 * There may be remaining CIs, if the peer is requesting negotiation 01238 * on an option that we didn't include in our request packet. 01239 * If they want to negotiate about IP addresses, we comply. 01240 * If they want us to ask for compression, we refuse. 01241 * If they want us to ask for ms-dns, we do that, since some 01242 * peers get huffy if we don't. 01243 */ 01244 while (len >= CILEN_VOID) { 01245 GETCHAR(citype, p); 01246 GETCHAR(cilen, p); 01247 if ( cilen < CILEN_VOID || (len -= cilen) < 0 ) 01248 goto bad; 01249 next = p + cilen - 2; 01250 01251 switch (citype) { 01252 #if VJ_SUPPORT 01253 case CI_COMPRESSTYPE: 01254 if (go->neg_vj || no.neg_vj || 01255 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) 01256 goto bad; 01257 no.neg_vj = 1; 01258 break; 01259 #endif /* VJ_SUPPORT */ 01260 case CI_ADDRS: 01261 if ((!go->neg_addr && go->old_addrs) || no.old_addrs 01262 || cilen != CILEN_ADDRS) 01263 goto bad; 01264 try_.neg_addr = 0; 01265 GETLONG(l, p); 01266 ciaddr1 = lwip_htonl(l); 01267 if (ciaddr1 && go->accept_local) 01268 try_.ouraddr = ciaddr1; 01269 GETLONG(l, p); 01270 ciaddr2 = lwip_htonl(l); 01271 if (ciaddr2 && go->accept_remote) 01272 try_.hisaddr = ciaddr2; 01273 no.old_addrs = 1; 01274 break; 01275 case CI_ADDR: 01276 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) 01277 goto bad; 01278 try_.old_addrs = 0; 01279 GETLONG(l, p); 01280 ciaddr1 = lwip_htonl(l); 01281 if (ciaddr1 && go->accept_local) 01282 try_.ouraddr = ciaddr1; 01283 if (try_.ouraddr != 0) 01284 try_.neg_addr = 1; 01285 no.neg_addr = 1; 01286 break; 01287 #if LWIP_DNS 01288 case CI_MS_DNS1: 01289 if (go->req_dns1 || no.req_dns1 || cilen != CILEN_ADDR) 01290 goto bad; 01291 GETLONG(l, p); 01292 try_.dnsaddr[0] = lwip_htonl(l); 01293 try_.req_dns1 = 1; 01294 no.req_dns1 = 1; 01295 break; 01296 case CI_MS_DNS2: 01297 if (go->req_dns2 || no.req_dns2 || cilen != CILEN_ADDR) 01298 goto bad; 01299 GETLONG(l, p); 01300 try_.dnsaddr[1] = lwip_htonl(l); 01301 try_.req_dns2 = 1; 01302 no.req_dns2 = 1; 01303 break; 01304 #endif /* LWIP_DNS */ 01305 #if 0 /* UNUSED - WINS */ 01306 case CI_MS_WINS1: 01307 case CI_MS_WINS2: 01308 if (cilen != CILEN_ADDR) 01309 goto bad; 01310 GETLONG(l, p); 01311 ciaddr1 = lwip_htonl(l); 01312 if (ciaddr1) 01313 try_.winsaddr[citype == CI_MS_WINS2] = ciaddr1; 01314 break; 01315 #endif /* UNUSED - WINS */ 01316 default: 01317 break; 01318 } 01319 p = next; 01320 } 01321 01322 /* 01323 * OK, the Nak is good. Now we can update state. 01324 * If there are any remaining options, we ignore them. 01325 */ 01326 if (f->state != PPP_FSM_OPENED) 01327 *go = try_; 01328 01329 return 1; 01330 01331 bad: 01332 IPCPDEBUG(("ipcp_nakci: received bad Nak!")); 01333 return 0; 01334 } 01335 01336 01337 /* 01338 * ipcp_rejci - Reject some of our CIs. 01339 * Callback from fsm_rconfnakrej. 01340 */ 01341 static int ipcp_rejci(fsm *f, u_char *p, int len) { 01342 ppp_pcb *pcb = f->pcb; 01343 ipcp_options *go = &pcb->ipcp_gotoptions; 01344 u_char cilen; 01345 #if VJ_SUPPORT 01346 u_char cimaxslotindex, ciflag; 01347 u_short cishort; 01348 #endif /* VJ_SUPPORT */ 01349 u32_t cilong; 01350 ipcp_options try_; /* options to request next time */ 01351 01352 try_ = *go; 01353 /* 01354 * Any Rejected CIs must be in exactly the same order that we sent. 01355 * Check packet length and CI length at each step. 01356 * If we find any deviations, then this packet is bad. 01357 */ 01358 #define REJCIADDRS(opt, neg, val1, val2) \ 01359 if ((neg) && \ 01360 (cilen = p[1]) == CILEN_ADDRS && \ 01361 len >= cilen && \ 01362 p[0] == opt) { \ 01363 u32_t l; \ 01364 len -= cilen; \ 01365 INCPTR(2, p); \ 01366 GETLONG(l, p); \ 01367 cilong = lwip_htonl(l); \ 01368 /* Check rejected value. */ \ 01369 if (cilong != val1) \ 01370 goto bad; \ 01371 GETLONG(l, p); \ 01372 cilong = lwip_htonl(l); \ 01373 /* Check rejected value. */ \ 01374 if (cilong != val2) \ 01375 goto bad; \ 01376 try_.old_addrs = 0; \ 01377 } 01378 01379 #if VJ_SUPPORT 01380 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \ 01381 if (go->neg && \ 01382 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \ 01383 len >= p[1] && \ 01384 p[0] == opt) { \ 01385 len -= p[1]; \ 01386 INCPTR(2, p); \ 01387 GETSHORT(cishort, p); \ 01388 /* Check rejected value. */ \ 01389 if (cishort != val) \ 01390 goto bad; \ 01391 if (!old) { \ 01392 GETCHAR(cimaxslotindex, p); \ 01393 if (cimaxslotindex != maxslot) \ 01394 goto bad; \ 01395 GETCHAR(ciflag, p); \ 01396 if (ciflag != cflag) \ 01397 goto bad; \ 01398 } \ 01399 try_.neg = 0; \ 01400 } 01401 #endif /* VJ_SUPPORT */ 01402 01403 #define REJCIADDR(opt, neg, val) \ 01404 if (go->neg && \ 01405 (cilen = p[1]) == CILEN_ADDR && \ 01406 len >= cilen && \ 01407 p[0] == opt) { \ 01408 u32_t l; \ 01409 len -= cilen; \ 01410 INCPTR(2, p); \ 01411 GETLONG(l, p); \ 01412 cilong = lwip_htonl(l); \ 01413 /* Check rejected value. */ \ 01414 if (cilong != val) \ 01415 goto bad; \ 01416 try_.neg = 0; \ 01417 } 01418 01419 #if LWIP_DNS 01420 #define REJCIDNS(opt, neg, dnsaddr) \ 01421 if (go->neg && \ 01422 ((cilen = p[1]) == CILEN_ADDR) && \ 01423 len >= cilen && \ 01424 p[0] == opt) { \ 01425 u32_t l; \ 01426 len -= cilen; \ 01427 INCPTR(2, p); \ 01428 GETLONG(l, p); \ 01429 cilong = lwip_htonl(l); \ 01430 /* Check rejected value. */ \ 01431 if (cilong != dnsaddr) \ 01432 goto bad; \ 01433 try_.neg = 0; \ 01434 } 01435 #endif /* LWIP_DNS */ 01436 01437 #if 0 /* UNUSED - WINS */ 01438 #define REJCIWINS(opt, addr) \ 01439 if (addr && \ 01440 ((cilen = p[1]) == CILEN_ADDR) && \ 01441 len >= cilen && \ 01442 p[0] == opt) { \ 01443 u32_t l; \ 01444 len -= cilen; \ 01445 INCPTR(2, p); \ 01446 GETLONG(l, p); \ 01447 cilong = lwip_htonl(l); \ 01448 /* Check rejected value. */ \ 01449 if (cilong != addr) \ 01450 goto bad; \ 01451 try_.winsaddr[opt == CI_MS_WINS2] = 0; \ 01452 } 01453 #endif /* UNUSED - WINS */ 01454 01455 REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, 01456 go->ouraddr, go->hisaddr); 01457 01458 #if VJ_SUPPORT 01459 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj, 01460 go->maxslotindex, go->cflag); 01461 #endif /* VJ_SUPPORT */ 01462 01463 REJCIADDR(CI_ADDR, neg_addr, go->ouraddr); 01464 01465 #if LWIP_DNS 01466 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]); 01467 01468 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]); 01469 #endif /* LWIP_DNS */ 01470 01471 #if 0 /* UNUSED - WINS */ 01472 REJCIWINS(CI_MS_WINS1, go->winsaddr[0]); 01473 01474 REJCIWINS(CI_MS_WINS2, go->winsaddr[1]); 01475 #endif /* UNUSED - WINS */ 01476 01477 /* 01478 * If there are any remaining CIs, then this packet is bad. 01479 */ 01480 if (len != 0) 01481 goto bad; 01482 /* 01483 * Now we can update state. 01484 */ 01485 if (f->state != PPP_FSM_OPENED) 01486 *go = try_; 01487 return 1; 01488 01489 bad: 01490 IPCPDEBUG(("ipcp_rejci: received bad Reject!")); 01491 return 0; 01492 } 01493 01494 01495 /* 01496 * ipcp_reqci - Check the peer's requested CIs and send appropriate response. 01497 * Callback from fsm_rconfreq, Receive Configure Request 01498 * 01499 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified 01500 * appropriately. If reject_if_disagree is non-zero, doesn't return 01501 * CONFNAK; returns CONFREJ if it can't return CONFACK. 01502 * 01503 * inp = Requested CIs 01504 * len = Length of requested CIs 01505 */ 01506 static int ipcp_reqci(fsm *f, u_char *inp, int *len, int reject_if_disagree) { 01507 ppp_pcb *pcb = f->pcb; 01508 ipcp_options *wo = &pcb->ipcp_wantoptions; 01509 ipcp_options *ho = &pcb->ipcp_hisoptions; 01510 ipcp_options *ao = &pcb->ipcp_allowoptions; 01511 u_char *cip, *next; /* Pointer to current and next CIs */ 01512 u_short cilen, citype; /* Parsed len, type */ 01513 #if VJ_SUPPORT 01514 u_short cishort; /* Parsed short value */ 01515 #endif /* VJ_SUPPORT */ 01516 u32_t tl, ciaddr1, ciaddr2;/* Parsed address values */ 01517 int rc = CONFACK; /* Final packet return code */ 01518 int orc; /* Individual option return code */ 01519 u_char *p; /* Pointer to next char to parse */ 01520 u_char *ucp = inp; /* Pointer to current output char */ 01521 int l = *len; /* Length left */ 01522 #if VJ_SUPPORT 01523 u_char maxslotindex, cflag; 01524 #endif /* VJ_SUPPORT */ 01525 #if LWIP_DNS 01526 int d; 01527 #endif /* LWIP_DNS */ 01528 01529 /* 01530 * Reset all his options. 01531 */ 01532 BZERO(ho, sizeof(*ho)); 01533 01534 /* 01535 * Process all his options. 01536 */ 01537 next = inp; 01538 while (l) { 01539 orc = CONFACK; /* Assume success */ 01540 cip = p = next; /* Remember begining of CI */ 01541 if (l < 2 || /* Not enough data for CI header or */ 01542 p[1] < 2 || /* CI length too small or */ 01543 p[1] > l) { /* CI length too big? */ 01544 IPCPDEBUG(("ipcp_reqci: bad CI length!")); 01545 orc = CONFREJ; /* Reject bad CI */ 01546 cilen = l; /* Reject till end of packet */ 01547 l = 0; /* Don't loop again */ 01548 goto endswitch; 01549 } 01550 GETCHAR(citype, p); /* Parse CI type */ 01551 GETCHAR(cilen, p); /* Parse CI length */ 01552 l -= cilen; /* Adjust remaining length */ 01553 next += cilen; /* Step to next CI */ 01554 01555 switch (citype) { /* Check CI type */ 01556 case CI_ADDRS: 01557 if (!ao->old_addrs || ho->neg_addr || 01558 cilen != CILEN_ADDRS) { /* Check CI length */ 01559 orc = CONFREJ; /* Reject CI */ 01560 break; 01561 } 01562 01563 /* 01564 * If he has no address, or if we both have his address but 01565 * disagree about it, then NAK it with our idea. 01566 * In particular, if we don't know his address, but he does, 01567 * then accept it. 01568 */ 01569 GETLONG(tl, p); /* Parse source address (his) */ 01570 ciaddr1 = lwip_htonl(tl); 01571 if (ciaddr1 != wo->hisaddr 01572 && (ciaddr1 == 0 || !wo->accept_remote)) { 01573 orc = CONFNAK; 01574 if (!reject_if_disagree) { 01575 DECPTR(sizeof(u32_t), p); 01576 tl = lwip_ntohl(wo->hisaddr); 01577 PUTLONG(tl, p); 01578 } 01579 } else if (ciaddr1 == 0 && wo->hisaddr == 0) { 01580 /* 01581 * If neither we nor he knows his address, reject the option. 01582 */ 01583 orc = CONFREJ; 01584 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ 01585 break; 01586 } 01587 01588 /* 01589 * If he doesn't know our address, or if we both have our address 01590 * but disagree about it, then NAK it with our idea. 01591 */ 01592 GETLONG(tl, p); /* Parse desination address (ours) */ 01593 ciaddr2 = lwip_htonl(tl); 01594 if (ciaddr2 != wo->ouraddr) { 01595 if (ciaddr2 == 0 || !wo->accept_local) { 01596 orc = CONFNAK; 01597 if (!reject_if_disagree) { 01598 DECPTR(sizeof(u32_t), p); 01599 tl = lwip_ntohl(wo->ouraddr); 01600 PUTLONG(tl, p); 01601 } 01602 } else { 01603 wo->ouraddr = ciaddr2; /* accept peer's idea */ 01604 } 01605 } 01606 01607 ho->old_addrs = 1; 01608 ho->hisaddr = ciaddr1; 01609 ho->ouraddr = ciaddr2; 01610 break; 01611 01612 case CI_ADDR: 01613 if (!ao->neg_addr || ho->old_addrs || 01614 cilen != CILEN_ADDR) { /* Check CI length */ 01615 orc = CONFREJ; /* Reject CI */ 01616 break; 01617 } 01618 01619 /* 01620 * If he has no address, or if we both have his address but 01621 * disagree about it, then NAK it with our idea. 01622 * In particular, if we don't know his address, but he does, 01623 * then accept it. 01624 */ 01625 GETLONG(tl, p); /* Parse source address (his) */ 01626 ciaddr1 = lwip_htonl(tl); 01627 if (ciaddr1 != wo->hisaddr 01628 && (ciaddr1 == 0 || !wo->accept_remote)) { 01629 orc = CONFNAK; 01630 if (!reject_if_disagree) { 01631 DECPTR(sizeof(u32_t), p); 01632 tl = lwip_ntohl(wo->hisaddr); 01633 PUTLONG(tl, p); 01634 } 01635 } else if (ciaddr1 == 0 && wo->hisaddr == 0) { 01636 /* 01637 * Don't ACK an address of 0.0.0.0 - reject it instead. 01638 */ 01639 orc = CONFREJ; 01640 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ 01641 break; 01642 } 01643 01644 ho->neg_addr = 1; 01645 ho->hisaddr = ciaddr1; 01646 break; 01647 01648 #if LWIP_DNS 01649 case CI_MS_DNS1: 01650 case CI_MS_DNS2: 01651 /* Microsoft primary or secondary DNS request */ 01652 d = citype == CI_MS_DNS2; 01653 01654 /* If we do not have a DNS address then we cannot send it */ 01655 if (ao->dnsaddr[d] == 0 || 01656 cilen != CILEN_ADDR) { /* Check CI length */ 01657 orc = CONFREJ; /* Reject CI */ 01658 break; 01659 } 01660 GETLONG(tl, p); 01661 if (lwip_htonl(tl) != ao->dnsaddr[d]) { 01662 DECPTR(sizeof(u32_t), p); 01663 tl = lwip_ntohl(ao->dnsaddr[d]); 01664 PUTLONG(tl, p); 01665 orc = CONFNAK; 01666 } 01667 break; 01668 #endif /* LWIP_DNS */ 01669 01670 #if 0 /* UNUSED - WINS */ 01671 case CI_MS_WINS1: 01672 case CI_MS_WINS2: 01673 /* Microsoft primary or secondary WINS request */ 01674 d = citype == CI_MS_WINS2; 01675 01676 /* If we do not have a DNS address then we cannot send it */ 01677 if (ao->winsaddr[d] == 0 || 01678 cilen != CILEN_ADDR) { /* Check CI length */ 01679 orc = CONFREJ; /* Reject CI */ 01680 break; 01681 } 01682 GETLONG(tl, p); 01683 if (lwip_htonl(tl) != ao->winsaddr[d]) { 01684 DECPTR(sizeof(u32_t), p); 01685 tl = lwip_ntohl(ao->winsaddr[d]); 01686 PUTLONG(tl, p); 01687 orc = CONFNAK; 01688 } 01689 break; 01690 #endif /* UNUSED - WINS */ 01691 01692 #if VJ_SUPPORT 01693 case CI_COMPRESSTYPE: 01694 if (!ao->neg_vj || 01695 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) { 01696 orc = CONFREJ; 01697 break; 01698 } 01699 GETSHORT(cishort, p); 01700 01701 if (!(cishort == IPCP_VJ_COMP || 01702 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) { 01703 orc = CONFREJ; 01704 break; 01705 } 01706 01707 ho->neg_vj = 1; 01708 ho->vj_protocol = cishort; 01709 if (cilen == CILEN_VJ) { 01710 GETCHAR(maxslotindex, p); 01711 if (maxslotindex > ao->maxslotindex) { 01712 orc = CONFNAK; 01713 if (!reject_if_disagree){ 01714 DECPTR(1, p); 01715 PUTCHAR(ao->maxslotindex, p); 01716 } 01717 } 01718 GETCHAR(cflag, p); 01719 if (cflag && !ao->cflag) { 01720 orc = CONFNAK; 01721 if (!reject_if_disagree){ 01722 DECPTR(1, p); 01723 PUTCHAR(wo->cflag, p); 01724 } 01725 } 01726 ho->maxslotindex = maxslotindex; 01727 ho->cflag = cflag; 01728 } else { 01729 ho->old_vj = 1; 01730 ho->maxslotindex = MAX_STATES - 1; 01731 ho->cflag = 1; 01732 } 01733 break; 01734 #endif /* VJ_SUPPORT */ 01735 01736 default: 01737 orc = CONFREJ; 01738 break; 01739 } 01740 endswitch: 01741 if (orc == CONFACK && /* Good CI */ 01742 rc != CONFACK) /* but prior CI wasnt? */ 01743 continue; /* Don't send this one */ 01744 01745 if (orc == CONFNAK) { /* Nak this CI? */ 01746 if (reject_if_disagree) /* Getting fed up with sending NAKs? */ 01747 orc = CONFREJ; /* Get tough if so */ 01748 else { 01749 if (rc == CONFREJ) /* Rejecting prior CI? */ 01750 continue; /* Don't send this one */ 01751 if (rc == CONFACK) { /* Ack'd all prior CIs? */ 01752 rc = CONFNAK; /* Not anymore... */ 01753 ucp = inp; /* Backup */ 01754 } 01755 } 01756 } 01757 01758 if (orc == CONFREJ && /* Reject this CI */ 01759 rc != CONFREJ) { /* but no prior ones? */ 01760 rc = CONFREJ; 01761 ucp = inp; /* Backup */ 01762 } 01763 01764 /* Need to move CI? */ 01765 if (ucp != cip) 01766 MEMCPY(ucp, cip, cilen); /* Move it */ 01767 01768 /* Update output pointer */ 01769 INCPTR(cilen, ucp); 01770 } 01771 01772 /* 01773 * If we aren't rejecting this packet, and we want to negotiate 01774 * their address, and they didn't send their address, then we 01775 * send a NAK with a CI_ADDR option appended. We assume the 01776 * input buffer is long enough that we can append the extra 01777 * option safely. 01778 */ 01779 if (rc != CONFREJ && !ho->neg_addr && !ho->old_addrs && 01780 wo->req_addr && !reject_if_disagree && !pcb->settings.noremoteip) { 01781 if (rc == CONFACK) { 01782 rc = CONFNAK; 01783 ucp = inp; /* reset pointer */ 01784 wo->req_addr = 0; /* don't ask again */ 01785 } 01786 PUTCHAR(CI_ADDR, ucp); 01787 PUTCHAR(CILEN_ADDR, ucp); 01788 tl = lwip_ntohl(wo->hisaddr); 01789 PUTLONG(tl, ucp); 01790 } 01791 01792 *len = ucp - inp; /* Compute output length */ 01793 IPCPDEBUG(("ipcp: returning Configure-%s", CODENAME(rc))); 01794 return (rc); /* Return final code */ 01795 } 01796 01797 01798 #if 0 /* UNUSED */ 01799 /* 01800 * ip_check_options - check that any IP-related options are OK, 01801 * and assign appropriate defaults. 01802 */ 01803 static void 01804 ip_check_options() 01805 { 01806 struct hostent *hp; 01807 u32_t local; 01808 ipcp_options *wo = &ipcp_wantoptions[0]; 01809 01810 /* 01811 * Default our local IP address based on our hostname. 01812 * If local IP address already given, don't bother. 01813 */ 01814 if (wo->ouraddr == 0 && !disable_defaultip) { 01815 /* 01816 * Look up our hostname (possibly with domain name appended) 01817 * and take the first IP address as our local IP address. 01818 * If there isn't an IP address for our hostname, too bad. 01819 */ 01820 wo->accept_local = 1; /* don't insist on this default value */ 01821 if ((hp = gethostbyname(hostname)) != NULL) { 01822 local = *(u32_t *)hp->h_addr; 01823 if (local != 0 && !bad_ip_adrs(local)) 01824 wo->ouraddr = local; 01825 } 01826 } 01827 ask_for_local = wo->ouraddr != 0 || !disable_defaultip; 01828 } 01829 #endif /* UNUSED */ 01830 01831 #if DEMAND_SUPPORT 01832 /* 01833 * ip_demand_conf - configure the interface as though 01834 * IPCP were up, for use with dial-on-demand. 01835 */ 01836 static int 01837 ip_demand_conf(u) 01838 int u; 01839 { 01840 ppp_pcb *pcb = &ppp_pcb_list[u]; 01841 ipcp_options *wo = &ipcp_wantoptions[u]; 01842 01843 if (wo->hisaddr == 0 && !pcb->settings.noremoteip) { 01844 /* make up an arbitrary address for the peer */ 01845 wo->hisaddr = lwip_htonl(0x0a707070 + ifunit); 01846 wo->accept_remote = 1; 01847 } 01848 if (wo->ouraddr == 0) { 01849 /* make up an arbitrary address for us */ 01850 wo->ouraddr = lwip_htonl(0x0a404040 + ifunit); 01851 wo->accept_local = 1; 01852 ask_for_local = 0; /* don't tell the peer this address */ 01853 } 01854 if (!sifaddr(pcb, wo->ouraddr, wo->hisaddr, get_mask(wo->ouraddr))) 01855 return 0; 01856 if (!sifup(pcb)) 01857 return 0; 01858 if (!sifnpmode(pcb, PPP_IP, NPMODE_QUEUE)) 01859 return 0; 01860 #if 0 /* UNUSED */ 01861 if (wo->default_route) 01862 if (sifdefaultroute(pcb, wo->ouraddr, wo->hisaddr, 01863 wo->replace_default_route)) 01864 default_route_set[u] = 1; 01865 #endif /* UNUSED */ 01866 #if 0 /* UNUSED - PROXY ARP */ 01867 if (wo->proxy_arp) 01868 if (sifproxyarp(pcb, wo->hisaddr)) 01869 proxy_arp_set[u] = 1; 01870 #endif /* UNUSED - PROXY ARP */ 01871 01872 ppp_notice("local IP address %I", wo->ouraddr); 01873 if (wo->hisaddr) 01874 ppp_notice("remote IP address %I", wo->hisaddr); 01875 01876 return 1; 01877 } 01878 #endif /* DEMAND_SUPPORT */ 01879 01880 /* 01881 * ipcp_up - IPCP has come UP. 01882 * 01883 * Configure the IP network interface appropriately and bring it up. 01884 */ 01885 static void ipcp_up(fsm *f) { 01886 ppp_pcb *pcb = f->pcb; 01887 u32_t mask; 01888 ipcp_options *ho = &pcb->ipcp_hisoptions; 01889 ipcp_options *go = &pcb->ipcp_gotoptions; 01890 ipcp_options *wo = &pcb->ipcp_wantoptions; 01891 01892 IPCPDEBUG(("ipcp: up")); 01893 01894 /* 01895 * We must have a non-zero IP address for both ends of the link. 01896 */ 01897 if (!ho->neg_addr && !ho->old_addrs) 01898 ho->hisaddr = wo->hisaddr; 01899 01900 if (!(go->neg_addr || go->old_addrs) && (wo->neg_addr || wo->old_addrs) 01901 && wo->ouraddr != 0) { 01902 ppp_error("Peer refused to agree to our IP address"); 01903 ipcp_close(f->pcb, "Refused our IP address"); 01904 return; 01905 } 01906 if (go->ouraddr == 0) { 01907 ppp_error("Could not determine local IP address"); 01908 ipcp_close(f->pcb, "Could not determine local IP address"); 01909 return; 01910 } 01911 if (ho->hisaddr == 0 && !pcb->settings.noremoteip) { 01912 ho->hisaddr = lwip_htonl(0x0a404040); 01913 ppp_warn("Could not determine remote IP address: defaulting to %I", 01914 ho->hisaddr); 01915 } 01916 #if 0 /* UNUSED */ 01917 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0); 01918 if (ho->hisaddr != 0) 01919 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1); 01920 #endif /* UNUSED */ 01921 01922 #if LWIP_DNS 01923 if (!go->req_dns1) 01924 go->dnsaddr[0] = 0; 01925 if (!go->req_dns2) 01926 go->dnsaddr[1] = 0; 01927 #if 0 /* UNUSED */ 01928 if (go->dnsaddr[0]) 01929 script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0); 01930 if (go->dnsaddr[1]) 01931 script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0); 01932 #endif /* UNUSED */ 01933 if (pcb->settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) { 01934 sdns(pcb, go->dnsaddr[0], go->dnsaddr[1]); 01935 #if 0 /* UNUSED */ 01936 script_setenv("USEPEERDNS", "1", 0); 01937 create_resolv(go->dnsaddr[0], go->dnsaddr[1]); 01938 #endif /* UNUSED */ 01939 } 01940 #endif /* LWIP_DNS */ 01941 01942 /* 01943 * Check that the peer is allowed to use the IP address it wants. 01944 */ 01945 if (ho->hisaddr != 0) { 01946 u32_t addr = lwip_ntohl(ho->hisaddr); 01947 if ((addr >> IP_CLASSA_NSHIFT) == IP_LOOPBACKNET 01948 || IP_MULTICAST(addr) || IP_BADCLASS(addr) 01949 /* 01950 * For now, consider that PPP in server mode with peer required 01951 * to authenticate must provide the peer IP address, reject any 01952 * IP address wanted by peer different than the one we wanted. 01953 */ 01954 #if PPP_SERVER && PPP_AUTH_SUPPORT 01955 || (pcb->settings.auth_required && wo->hisaddr != ho->hisaddr) 01956 #endif /* PPP_SERVER && PPP_AUTH_SUPPORT */ 01957 ) { 01958 ppp_error("Peer is not authorized to use remote address %I", ho->hisaddr); 01959 ipcp_close(pcb, "Unauthorized remote IP address"); 01960 return; 01961 } 01962 } 01963 #if 0 /* Unused */ 01964 /* Upstream checking code */ 01965 if (ho->hisaddr != 0 && !auth_ip_addr(f->unit, ho->hisaddr)) { 01966 ppp_error("Peer is not authorized to use remote address %I", ho->hisaddr); 01967 ipcp_close(f->unit, "Unauthorized remote IP address"); 01968 return; 01969 } 01970 #endif /* Unused */ 01971 01972 #if VJ_SUPPORT 01973 /* set tcp compression */ 01974 sifvjcomp(pcb, ho->neg_vj, ho->cflag, ho->maxslotindex); 01975 #endif /* VJ_SUPPORT */ 01976 01977 #if DEMAND_SUPPORT 01978 /* 01979 * If we are doing dial-on-demand, the interface is already 01980 * configured, so we put out any saved-up packets, then set the 01981 * interface to pass IP packets. 01982 */ 01983 if (demand) { 01984 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) { 01985 ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr, 01986 wo->replace_default_route); 01987 if (go->ouraddr != wo->ouraddr) { 01988 ppp_warn("Local IP address changed to %I", go->ouraddr); 01989 script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0); 01990 wo->ouraddr = go->ouraddr; 01991 } else 01992 script_unsetenv("OLDIPLOCAL"); 01993 if (ho->hisaddr != wo->hisaddr && wo->hisaddr != 0) { 01994 ppp_warn("Remote IP address changed to %I", ho->hisaddr); 01995 script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0); 01996 wo->hisaddr = ho->hisaddr; 01997 } else 01998 script_unsetenv("OLDIPREMOTE"); 01999 02000 /* Set the interface to the new addresses */ 02001 mask = get_mask(go->ouraddr); 02002 if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) { 02003 #if PPP_DEBUG 02004 ppp_warn("Interface configuration failed"); 02005 #endif /* PPP_DEBUG */ 02006 ipcp_close(f->unit, "Interface configuration failed"); 02007 return; 02008 } 02009 02010 /* assign a default route through the interface if required */ 02011 if (ipcp_wantoptions[f->unit].default_route) 02012 if (sifdefaultroute(pcb, go->ouraddr, ho->hisaddr, 02013 wo->replace_default_route)) 02014 default_route_set[f->unit] = 1; 02015 02016 #if 0 /* UNUSED - PROXY ARP */ 02017 /* Make a proxy ARP entry if requested. */ 02018 if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp) 02019 if (sifproxyarp(pcb, ho->hisaddr)) 02020 proxy_arp_set[f->unit] = 1; 02021 #endif /* UNUSED - PROXY ARP */ 02022 02023 } 02024 demand_rexmit(PPP_IP,go->ouraddr); 02025 sifnpmode(pcb, PPP_IP, NPMODE_PASS); 02026 02027 } else 02028 #endif /* DEMAND_SUPPORT */ 02029 { 02030 /* 02031 * Set IP addresses and (if specified) netmask. 02032 */ 02033 mask = get_mask(go->ouraddr); 02034 02035 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) 02036 if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) { 02037 #if PPP_DEBUG 02038 ppp_warn("Interface configuration failed"); 02039 #endif /* PPP_DEBUG */ 02040 ipcp_close(f->pcb, "Interface configuration failed"); 02041 return; 02042 } 02043 #endif 02044 02045 /* bring the interface up for IP */ 02046 if (!sifup(pcb)) { 02047 #if PPP_DEBUG 02048 ppp_warn("Interface failed to come up"); 02049 #endif /* PPP_DEBUG */ 02050 ipcp_close(f->pcb, "Interface configuration failed"); 02051 return; 02052 } 02053 02054 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__))) 02055 if (!sifaddr(pcb, go->ouraddr, ho->hisaddr, mask)) { 02056 #if PPP_DEBUG 02057 ppp_warn("Interface configuration failed"); 02058 #endif /* PPP_DEBUG */ 02059 ipcp_close(f->unit, "Interface configuration failed"); 02060 return; 02061 } 02062 #endif 02063 #if DEMAND_SUPPORT 02064 sifnpmode(pcb, PPP_IP, NPMODE_PASS); 02065 #endif /* DEMAND_SUPPORT */ 02066 02067 #if 0 /* UNUSED */ 02068 /* assign a default route through the interface if required */ 02069 if (wo->default_route) 02070 if (sifdefaultroute(pcb, go->ouraddr, ho->hisaddr, 02071 wo->replace_default_route)) 02072 pcb->default_route_set = 1; 02073 #endif /* UNUSED */ 02074 02075 #if 0 /* UNUSED - PROXY ARP */ 02076 /* Make a proxy ARP entry if requested. */ 02077 if (ho->hisaddr != 0 && wo->proxy_arp) 02078 if (sifproxyarp(pcb, ho->hisaddr)) 02079 pcb->proxy_arp_set = 1; 02080 #endif /* UNUSED - PROXY ARP */ 02081 02082 wo->ouraddr = go->ouraddr; 02083 02084 ppp_notice("local IP address %I", go->ouraddr); 02085 if (ho->hisaddr != 0) 02086 ppp_notice("remote IP address %I", ho->hisaddr); 02087 #if LWIP_DNS 02088 if (go->dnsaddr[0]) 02089 ppp_notice("primary DNS address %I", go->dnsaddr[0]); 02090 if (go->dnsaddr[1]) 02091 ppp_notice("secondary DNS address %I", go->dnsaddr[1]); 02092 #endif /* LWIP_DNS */ 02093 } 02094 02095 #if PPP_STATS_SUPPORT 02096 reset_link_stats(f->unit); 02097 #endif /* PPP_STATS_SUPPORT */ 02098 02099 np_up(pcb, PPP_IP); 02100 pcb->ipcp_is_up = 1; 02101 02102 #if PPP_NOTIFY 02103 notify(ip_up_notifier, 0); 02104 #endif /* PPP_NOTIFY */ 02105 #if 0 /* UNUSED */ 02106 if (ip_up_hook) 02107 ip_up_hook(); 02108 #endif /* UNUSED */ 02109 } 02110 02111 02112 /* 02113 * ipcp_down - IPCP has gone DOWN. 02114 * 02115 * Take the IP network interface down, clear its addresses 02116 * and delete routes through it. 02117 */ 02118 static void ipcp_down(fsm *f) { 02119 ppp_pcb *pcb = f->pcb; 02120 ipcp_options *ho = &pcb->ipcp_hisoptions; 02121 ipcp_options *go = &pcb->ipcp_gotoptions; 02122 02123 IPCPDEBUG(("ipcp: down")); 02124 #if PPP_STATS_SUPPORT 02125 /* XXX a bit IPv4-centric here, we only need to get the stats 02126 * before the interface is marked down. */ 02127 /* XXX more correct: we must get the stats before running the notifiers, 02128 * at least for the radius plugin */ 02129 update_link_stats(f->unit); 02130 #endif /* PPP_STATS_SUPPORT */ 02131 #if PPP_NOTIFY 02132 notify(ip_down_notifier, 0); 02133 #endif /* PPP_NOTIFY */ 02134 #if 0 /* UNUSED */ 02135 if (ip_down_hook) 02136 ip_down_hook(); 02137 #endif /* UNUSED */ 02138 if (pcb->ipcp_is_up) { 02139 pcb->ipcp_is_up = 0; 02140 np_down(pcb, PPP_IP); 02141 } 02142 #if VJ_SUPPORT 02143 sifvjcomp(pcb, 0, 0, 0); 02144 #endif /* VJ_SUPPORT */ 02145 02146 #if PPP_STATS_SUPPORT 02147 print_link_stats(); /* _after_ running the notifiers and ip_down_hook(), 02148 * because print_link_stats() sets link_stats_valid 02149 * to 0 (zero) */ 02150 #endif /* PPP_STATS_SUPPORT */ 02151 02152 #if DEMAND_SUPPORT 02153 /* 02154 * If we are doing dial-on-demand, set the interface 02155 * to queue up outgoing packets (for now). 02156 */ 02157 if (demand) { 02158 sifnpmode(pcb, PPP_IP, NPMODE_QUEUE); 02159 } else 02160 #endif /* DEMAND_SUPPORT */ 02161 { 02162 #if DEMAND_SUPPORT 02163 sifnpmode(pcb, PPP_IP, NPMODE_DROP); 02164 #endif /* DEMAND_SUPPORT */ 02165 sifdown(pcb); 02166 ipcp_clear_addrs(pcb, go->ouraddr, 02167 ho->hisaddr, 0); 02168 #if LWIP_DNS 02169 cdns(pcb, go->dnsaddr[0], go->dnsaddr[1]); 02170 #endif /* LWIP_DNS */ 02171 } 02172 } 02173 02174 02175 /* 02176 * ipcp_clear_addrs() - clear the interface addresses, routes, 02177 * proxy arp entries, etc. 02178 */ 02179 static void ipcp_clear_addrs(ppp_pcb *pcb, u32_t ouraddr, u32_t hisaddr, u8_t replacedefaultroute) { 02180 LWIP_UNUSED_ARG(replacedefaultroute); 02181 02182 #if 0 /* UNUSED - PROXY ARP */ 02183 if (pcb->proxy_arp_set) { 02184 cifproxyarp(pcb, hisaddr); 02185 pcb->proxy_arp_set = 0; 02186 } 02187 #endif /* UNUSED - PROXY ARP */ 02188 #if 0 /* UNUSED */ 02189 /* If replacedefaultroute, sifdefaultroute will be called soon 02190 * with replacedefaultroute set and that will overwrite the current 02191 * default route. This is the case only when doing demand, otherwise 02192 * during demand, this cifdefaultroute would restore the old default 02193 * route which is not what we want in this case. In the non-demand 02194 * case, we'll delete the default route and restore the old if there 02195 * is one saved by an sifdefaultroute with replacedefaultroute. 02196 */ 02197 if (!replacedefaultroute && pcb->default_route_set) { 02198 cifdefaultroute(pcb, ouraddr, hisaddr); 02199 pcb->default_route_set = 0; 02200 } 02201 #endif /* UNUSED */ 02202 cifaddr(pcb, ouraddr, hisaddr); 02203 } 02204 02205 02206 /* 02207 * ipcp_finished - possibly shut down the lower layers. 02208 */ 02209 static void ipcp_finished(fsm *f) { 02210 ppp_pcb *pcb = f->pcb; 02211 if (pcb->ipcp_is_open) { 02212 pcb->ipcp_is_open = 0; 02213 np_finished(pcb, PPP_IP); 02214 } 02215 } 02216 02217 02218 #if 0 /* UNUSED */ 02219 /* 02220 * create_resolv - create the replacement resolv.conf file 02221 */ 02222 static void 02223 create_resolv(peerdns1, peerdns2) 02224 u32_t peerdns1, peerdns2; 02225 { 02226 02227 } 02228 #endif /* UNUSED */ 02229 02230 #if PRINTPKT_SUPPORT 02231 /* 02232 * ipcp_printpkt - print the contents of an IPCP packet. 02233 */ 02234 static const char* const ipcp_codenames[] = { 02235 "ConfReq", "ConfAck", "ConfNak", "ConfRej", 02236 "TermReq", "TermAck", "CodeRej" 02237 }; 02238 02239 static int ipcp_printpkt(const u_char *p, int plen, 02240 void (*printer) (void *, const char *, ...), void *arg) { 02241 int code, id, len, olen; 02242 const u_char *pstart, *optend; 02243 #if VJ_SUPPORT 02244 u_short cishort; 02245 #endif /* VJ_SUPPORT */ 02246 u32_t cilong; 02247 02248 if (plen < HEADERLEN) 02249 return 0; 02250 pstart = p; 02251 GETCHAR(code, p); 02252 GETCHAR(id, p); 02253 GETSHORT(len, p); 02254 if (len < HEADERLEN || len > plen) 02255 return 0; 02256 02257 if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(ipcp_codenames)) 02258 printer(arg, " %s", ipcp_codenames[code-1]); 02259 else 02260 printer(arg, " code=0x%x", code); 02261 printer(arg, " id=0x%x", id); 02262 len -= HEADERLEN; 02263 switch (code) { 02264 case CONFREQ: 02265 case CONFACK: 02266 case CONFNAK: 02267 case CONFREJ: 02268 /* print option list */ 02269 while (len >= 2) { 02270 GETCHAR(code, p); 02271 GETCHAR(olen, p); 02272 p -= 2; 02273 if (olen < 2 || olen > len) { 02274 break; 02275 } 02276 printer(arg, " <"); 02277 len -= olen; 02278 optend = p + olen; 02279 switch (code) { 02280 case CI_ADDRS: 02281 if (olen == CILEN_ADDRS) { 02282 p += 2; 02283 GETLONG(cilong, p); 02284 printer(arg, "addrs %I", lwip_htonl(cilong)); 02285 GETLONG(cilong, p); 02286 printer(arg, " %I", lwip_htonl(cilong)); 02287 } 02288 break; 02289 #if VJ_SUPPORT 02290 case CI_COMPRESSTYPE: 02291 if (olen >= CILEN_COMPRESS) { 02292 p += 2; 02293 GETSHORT(cishort, p); 02294 printer(arg, "compress "); 02295 switch (cishort) { 02296 case IPCP_VJ_COMP: 02297 printer(arg, "VJ"); 02298 break; 02299 case IPCP_VJ_COMP_OLD: 02300 printer(arg, "old-VJ"); 02301 break; 02302 default: 02303 printer(arg, "0x%x", cishort); 02304 } 02305 } 02306 break; 02307 #endif /* VJ_SUPPORT */ 02308 case CI_ADDR: 02309 if (olen == CILEN_ADDR) { 02310 p += 2; 02311 GETLONG(cilong, p); 02312 printer(arg, "addr %I", lwip_htonl(cilong)); 02313 } 02314 break; 02315 #if LWIP_DNS 02316 case CI_MS_DNS1: 02317 case CI_MS_DNS2: 02318 p += 2; 02319 GETLONG(cilong, p); 02320 printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1? 1: 2), 02321 htonl(cilong)); 02322 break; 02323 #endif /* LWIP_DNS */ 02324 #if 0 /* UNUSED - WINS */ 02325 case CI_MS_WINS1: 02326 case CI_MS_WINS2: 02327 p += 2; 02328 GETLONG(cilong, p); 02329 printer(arg, "ms-wins %I", lwip_htonl(cilong)); 02330 break; 02331 #endif /* UNUSED - WINS */ 02332 default: 02333 break; 02334 } 02335 while (p < optend) { 02336 GETCHAR(code, p); 02337 printer(arg, " %.2x", code); 02338 } 02339 printer(arg, ">"); 02340 } 02341 break; 02342 02343 case TERMACK: 02344 case TERMREQ: 02345 if (len > 0 && *p >= ' ' && *p < 0x7f) { 02346 printer(arg, " "); 02347 ppp_print_string(p, len, printer, arg); 02348 p += len; 02349 len = 0; 02350 } 02351 break; 02352 default: 02353 break; 02354 } 02355 02356 /* print the rest of the bytes in the packet */ 02357 for (; len > 0; --len) { 02358 GETCHAR(code, p); 02359 printer(arg, " %.2x", code); 02360 } 02361 02362 return p - pstart; 02363 } 02364 #endif /* PRINTPKT_SUPPORT */ 02365 02366 #if DEMAND_SUPPORT 02367 /* 02368 * ip_active_pkt - see if this IP packet is worth bringing the link up for. 02369 * We don't bring the link up for IP fragments or for TCP FIN packets 02370 * with no data. 02371 */ 02372 #define IP_HDRLEN 20 /* bytes */ 02373 #define IP_OFFMASK 0x1fff 02374 #ifndef IPPROTO_TCP 02375 #define IPPROTO_TCP 6 02376 #endif 02377 #define TCP_HDRLEN 20 02378 #define TH_FIN 0x01 02379 02380 /* 02381 * We use these macros because the IP header may be at an odd address, 02382 * and some compilers might use word loads to get th_off or ip_hl. 02383 */ 02384 02385 #define net_short(x) (((x)[0] << 8) + (x)[1]) 02386 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF) 02387 #define get_ipoff(x) net_short((unsigned char *)(x) + 6) 02388 #define get_ipproto(x) (((unsigned char *)(x))[9]) 02389 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) 02390 #define get_tcpflags(x) (((unsigned char *)(x))[13]) 02391 02392 static int 02393 ip_active_pkt(pkt, len) 02394 u_char *pkt; 02395 int len; 02396 { 02397 u_char *tcp; 02398 int hlen; 02399 02400 len -= PPP_HDRLEN; 02401 pkt += PPP_HDRLEN; 02402 if (len < IP_HDRLEN) 02403 return 0; 02404 if ((get_ipoff(pkt) & IP_OFFMASK) != 0) 02405 return 0; 02406 if (get_ipproto(pkt) != IPPROTO_TCP) 02407 return 1; 02408 hlen = get_iphl(pkt) * 4; 02409 if (len < hlen + TCP_HDRLEN) 02410 return 0; 02411 tcp = pkt + hlen; 02412 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) 02413 return 0; 02414 return 1; 02415 } 02416 #endif /* DEMAND_SUPPORT */ 02417 02418 #endif /* PPP_SUPPORT && PPP_IPV4_SUPPORT */
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