| /** In contrast to pppd 2.3.1, DNS support has been added, proxy-ARP and |
| dial-on-demand has been stripped. */ |
| /***************************************************************************** |
| * ipcp.c - Network PPP IP Control Protocol program file. |
| * |
| * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. |
| * portions Copyright (c) 1997 by Global Election Systems Inc. |
| * |
| * The authors hereby grant permission to use, copy, modify, distribute, |
| * and license this software and its documentation for any purpose, provided |
| * that existing copyright notices are retained in all copies and that this |
| * notice and the following disclaimer are included verbatim in any |
| * distributions. No written agreement, license, or royalty fee is required |
| * for any of the authorized uses. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| ****************************************************************************** |
| * REVISION HISTORY |
| * |
| * 03-01-01 Marc Boucher <marc@mbsi.ca> |
| * Ported to lwIP. |
| * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc. |
| * Original. |
| *****************************************************************************/ |
| /* |
| * ipcp.c - PPP IP Control Protocol. |
| * |
| * Copyright (c) 1989 Carnegie Mellon University. |
| * All rights reserved. |
| * |
| * 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 Carnegie Mellon University. The name of the |
| * University 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. |
| */ |
| |
| #include "lwip/opt.h" |
| |
| #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */ |
| |
| #include "ppp_impl.h" |
| #include "pppdebug.h" |
| |
| #include "auth.h" |
| #include "fsm.h" |
| #include "vj.h" |
| #include "ipcp.h" |
| |
| #include "lwip/inet.h" |
| |
| #include <string.h> |
| |
| /* #define OLD_CI_ADDRS 1 */ /* Support deprecated address negotiation. */ |
| |
| /* global vars */ |
| ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */ |
| ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ |
| ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ |
| ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ |
| |
| /* local vars */ |
| static int default_route_set[NUM_PPP]; /* Have set up a default route */ |
| static int cis_received[NUM_PPP]; /* # Conf-Reqs received */ |
| |
| |
| /* |
| * Callbacks for fsm code. (CI = Configuration Information) |
| */ |
| static void ipcp_resetci (fsm *); /* Reset our CI */ |
| static int ipcp_cilen (fsm *); /* Return length of our CI */ |
| static void ipcp_addci (fsm *, u_char *, int *); /* Add our CI */ |
| static int ipcp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */ |
| static int ipcp_nakci (fsm *, u_char *, int); /* Peer nak'd our CI */ |
| static int ipcp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */ |
| static int ipcp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */ |
| static void ipcp_up (fsm *); /* We're UP */ |
| static void ipcp_down (fsm *); /* We're DOWN */ |
| #if PPP_ADDITIONAL_CALLBACKS |
| static void ipcp_script (fsm *, char *); /* Run an up/down script */ |
| #endif |
| static void ipcp_finished (fsm *); /* Don't need lower layer */ |
| |
| |
| fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */ |
| |
| |
| static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */ |
| ipcp_resetci, /* Reset our Configuration Information */ |
| ipcp_cilen, /* Length of our Configuration Information */ |
| ipcp_addci, /* Add our Configuration Information */ |
| ipcp_ackci, /* ACK our Configuration Information */ |
| ipcp_nakci, /* NAK our Configuration Information */ |
| ipcp_rejci, /* Reject our Configuration Information */ |
| ipcp_reqci, /* Request peer's Configuration Information */ |
| ipcp_up, /* Called when fsm reaches LS_OPENED state */ |
| ipcp_down, /* Called when fsm leaves LS_OPENED state */ |
| NULL, /* Called when we want the lower layer up */ |
| ipcp_finished, /* Called when we want the lower layer down */ |
| NULL, /* Called when Protocol-Reject received */ |
| NULL, /* Retransmission is necessary */ |
| NULL, /* Called to handle protocol-specific codes */ |
| "IPCP" /* String name of protocol */ |
| }; |
| |
| /* |
| * Protocol entry points from main code. |
| */ |
| static void ipcp_init (int); |
| static void ipcp_open (int); |
| static void ipcp_close (int, char *); |
| static void ipcp_lowerup (int); |
| static void ipcp_lowerdown (int); |
| static void ipcp_input (int, u_char *, int); |
| static void ipcp_protrej (int); |
| |
| |
| struct protent ipcp_protent = { |
| PPP_IPCP, |
| ipcp_init, |
| ipcp_input, |
| ipcp_protrej, |
| ipcp_lowerup, |
| ipcp_lowerdown, |
| ipcp_open, |
| ipcp_close, |
| #if PPP_ADDITIONAL_CALLBACKS |
| ipcp_printpkt, |
| NULL, |
| #endif /* PPP_ADDITIONAL_CALLBACKS */ |
| 1, |
| "IPCP", |
| #if PPP_ADDITIONAL_CALLBACKS |
| ip_check_options, |
| NULL, |
| ip_active_pkt |
| #endif /* PPP_ADDITIONAL_CALLBACKS */ |
| }; |
| |
| static void ipcp_clear_addrs (int); |
| |
| /* |
| * Lengths of configuration options. |
| */ |
| #define CILEN_VOID 2 |
| #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */ |
| #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */ |
| #define CILEN_ADDR 6 /* new-style single address option */ |
| #define CILEN_ADDRS 10 /* old-style dual address option */ |
| |
| |
| #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ |
| (x) == CONFNAK ? "NAK" : "REJ") |
| |
| |
| /* |
| * ipcp_init - Initialize IPCP. |
| */ |
| static void |
| ipcp_init(int unit) |
| { |
| fsm *f = &ipcp_fsm[unit]; |
| ipcp_options *wo = &ipcp_wantoptions[unit]; |
| ipcp_options *ao = &ipcp_allowoptions[unit]; |
| |
| f->unit = unit; |
| f->protocol = PPP_IPCP; |
| f->callbacks = &ipcp_callbacks; |
| fsm_init(&ipcp_fsm[unit]); |
| |
| memset(wo, 0, sizeof(*wo)); |
| memset(ao, 0, sizeof(*ao)); |
| |
| wo->neg_addr = 1; |
| wo->ouraddr = 0; |
| #if VJ_SUPPORT |
| wo->neg_vj = 1; |
| #else /* VJ_SUPPORT */ |
| wo->neg_vj = 0; |
| #endif /* VJ_SUPPORT */ |
| wo->vj_protocol = IPCP_VJ_COMP; |
| wo->maxslotindex = MAX_SLOTS - 1; |
| wo->cflag = 0; |
| wo->default_route = 1; |
| |
| ao->neg_addr = 1; |
| #if VJ_SUPPORT |
| ao->neg_vj = 1; |
| #else /* VJ_SUPPORT */ |
| ao->neg_vj = 0; |
| #endif /* VJ_SUPPORT */ |
| ao->maxslotindex = MAX_SLOTS - 1; |
| ao->cflag = 1; |
| ao->default_route = 1; |
| } |
| |
| |
| /* |
| * ipcp_open - IPCP is allowed to come up. |
| */ |
| static void |
| ipcp_open(int unit) |
| { |
| fsm_open(&ipcp_fsm[unit]); |
| } |
| |
| |
| /* |
| * ipcp_close - Take IPCP down. |
| */ |
| static void |
| ipcp_close(int unit, char *reason) |
| { |
| fsm_close(&ipcp_fsm[unit], reason); |
| } |
| |
| |
| /* |
| * ipcp_lowerup - The lower layer is up. |
| */ |
| static void |
| ipcp_lowerup(int unit) |
| { |
| fsm_lowerup(&ipcp_fsm[unit]); |
| } |
| |
| |
| /* |
| * ipcp_lowerdown - The lower layer is down. |
| */ |
| static void |
| ipcp_lowerdown(int unit) |
| { |
| fsm_lowerdown(&ipcp_fsm[unit]); |
| } |
| |
| |
| /* |
| * ipcp_input - Input IPCP packet. |
| */ |
| static void |
| ipcp_input(int unit, u_char *p, int len) |
| { |
| fsm_input(&ipcp_fsm[unit], p, len); |
| } |
| |
| |
| /* |
| * ipcp_protrej - A Protocol-Reject was received for IPCP. |
| * |
| * Pretend the lower layer went down, so we shut up. |
| */ |
| static void |
| ipcp_protrej(int unit) |
| { |
| fsm_lowerdown(&ipcp_fsm[unit]); |
| } |
| |
| |
| /* |
| * ipcp_resetci - Reset our CI. |
| */ |
| static void |
| ipcp_resetci(fsm *f) |
| { |
| ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| |
| wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr; |
| if (wo->ouraddr == 0) { |
| wo->accept_local = 1; |
| } |
| if (wo->hisaddr == 0) { |
| wo->accept_remote = 1; |
| } |
| /* Request DNS addresses from the peer */ |
| wo->req_dns1 = ppp_settings.usepeerdns; |
| wo->req_dns2 = ppp_settings.usepeerdns; |
| ipcp_gotoptions[f->unit] = *wo; |
| cis_received[f->unit] = 0; |
| } |
| |
| |
| /* |
| * ipcp_cilen - Return length of our CI. |
| */ |
| static int |
| ipcp_cilen(fsm *f) |
| { |
| ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
| |
| #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) |
| #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0) |
| #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0) |
| |
| /* |
| * First see if we want to change our options to the old |
| * forms because we have received old forms from the peer. |
| */ |
| if (wo->neg_addr && !go->neg_addr && !go->old_addrs) { |
| /* use the old style of address negotiation */ |
| go->neg_addr = 1; |
| go->old_addrs = 1; |
| } |
| if (wo->neg_vj && !go->neg_vj && !go->old_vj) { |
| /* try an older style of VJ negotiation */ |
| if (cis_received[f->unit] == 0) { |
| /* keep trying the new style until we see some CI from the peer */ |
| go->neg_vj = 1; |
| } else { |
| /* use the old style only if the peer did */ |
| if (ho->neg_vj && ho->old_vj) { |
| go->neg_vj = 1; |
| go->old_vj = 1; |
| go->vj_protocol = ho->vj_protocol; |
| } |
| } |
| } |
| |
| return (LENCIADDR(go->neg_addr, go->old_addrs) + |
| LENCIVJ(go->neg_vj, go->old_vj) + |
| LENCIDNS(go->req_dns1) + |
| LENCIDNS(go->req_dns2)); |
| } |
| |
| |
| /* |
| * ipcp_addci - Add our desired CIs to a packet. |
| */ |
| static void |
| ipcp_addci(fsm *f, u_char *ucp, int *lenp) |
| { |
| ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| int len = *lenp; |
| |
| #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \ |
| if (neg) { \ |
| int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ |
| if (len >= vjlen) { \ |
| PUTCHAR(opt, ucp); \ |
| PUTCHAR(vjlen, ucp); \ |
| PUTSHORT(val, ucp); \ |
| if (!old) { \ |
| PUTCHAR(maxslotindex, ucp); \ |
| PUTCHAR(cflag, ucp); \ |
| } \ |
| len -= vjlen; \ |
| } else { \ |
| neg = 0; \ |
| } \ |
| } |
| |
| #define ADDCIADDR(opt, neg, old, val1, val2) \ |
| if (neg) { \ |
| int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ |
| if (len >= addrlen) { \ |
| u32_t l; \ |
| PUTCHAR(opt, ucp); \ |
| PUTCHAR(addrlen, ucp); \ |
| l = ntohl(val1); \ |
| PUTLONG(l, ucp); \ |
| if (old) { \ |
| l = ntohl(val2); \ |
| PUTLONG(l, ucp); \ |
| } \ |
| len -= addrlen; \ |
| } else { \ |
| neg = 0; \ |
| } \ |
| } |
| |
| #define ADDCIDNS(opt, neg, addr) \ |
| if (neg) { \ |
| if (len >= CILEN_ADDR) { \ |
| u32_t l; \ |
| PUTCHAR(opt, ucp); \ |
| PUTCHAR(CILEN_ADDR, ucp); \ |
| l = ntohl(addr); \ |
| PUTLONG(l, ucp); \ |
| len -= CILEN_ADDR; \ |
| } else { \ |
| neg = 0; \ |
| } \ |
| } |
| |
| ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, |
| go->old_addrs, go->ouraddr, go->hisaddr); |
| |
| ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, |
| go->maxslotindex, go->cflag); |
| |
| ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); |
| |
| ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); |
| |
| *lenp -= len; |
| } |
| |
| |
| /* |
| * ipcp_ackci - Ack our CIs. |
| * |
| * Returns: |
| * 0 - Ack was bad. |
| * 1 - Ack was good. |
| */ |
| static int |
| ipcp_ackci(fsm *f, u_char *p, int len) |
| { |
| ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| u_short cilen, citype, cishort; |
| u32_t cilong; |
| u_char cimaxslotindex, cicflag; |
| |
| /* |
| * CIs must be in exactly the same order that we sent... |
| * Check packet length and CI length at each step. |
| * If we find any deviations, then this packet is bad. |
| */ |
| |
| #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \ |
| if (neg) { \ |
| int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ |
| if ((len -= vjlen) < 0) { \ |
| goto bad; \ |
| } \ |
| GETCHAR(citype, p); \ |
| GETCHAR(cilen, p); \ |
| if (cilen != vjlen || \ |
| citype != opt) { \ |
| goto bad; \ |
| } \ |
| GETSHORT(cishort, p); \ |
| if (cishort != val) { \ |
| goto bad; \ |
| } \ |
| if (!old) { \ |
| GETCHAR(cimaxslotindex, p); \ |
| if (cimaxslotindex != maxslotindex) { \ |
| goto bad; \ |
| } \ |
| GETCHAR(cicflag, p); \ |
| if (cicflag != cflag) { \ |
| goto bad; \ |
| } \ |
| } \ |
| } |
| |
| #define ACKCIADDR(opt, neg, old, val1, val2) \ |
| if (neg) { \ |
| int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ |
| u32_t l; \ |
| if ((len -= addrlen) < 0) { \ |
| goto bad; \ |
| } \ |
| GETCHAR(citype, p); \ |
| GETCHAR(cilen, p); \ |
| if (cilen != addrlen || \ |
| citype != opt) { \ |
| goto bad; \ |
| } \ |
| GETLONG(l, p); \ |
| cilong = htonl(l); \ |
| if (val1 != cilong) { \ |
| goto bad; \ |
| } \ |
| if (old) { \ |
| GETLONG(l, p); \ |
| cilong = htonl(l); \ |
| if (val2 != cilong) { \ |
| goto bad; \ |
| } \ |
| } \ |
| } |
| |
| #define ACKCIDNS(opt, neg, addr) \ |
| if (neg) { \ |
| u32_t l; \ |
| if ((len -= CILEN_ADDR) < 0) { \ |
| goto bad; \ |
| } \ |
| GETCHAR(citype, p); \ |
| GETCHAR(cilen, p); \ |
| if (cilen != CILEN_ADDR || \ |
| citype != opt) { \ |
| goto bad; \ |
| } \ |
| GETLONG(l, p); \ |
| cilong = htonl(l); \ |
| if (addr != cilong) { \ |
| goto bad; \ |
| } \ |
| } |
| |
| ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, |
| go->old_addrs, go->ouraddr, go->hisaddr); |
| |
| ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, |
| go->maxslotindex, go->cflag); |
| |
| ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); |
| |
| ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); |
| |
| /* |
| * If there are any remaining CIs, then this packet is bad. |
| */ |
| if (len != 0) { |
| goto bad; |
| } |
| return (1); |
| |
| bad: |
| IPCPDEBUG(LOG_INFO, ("ipcp_ackci: received bad Ack!\n")); |
| return (0); |
| } |
| |
| /* |
| * ipcp_nakci - Peer has sent a NAK for some of our CIs. |
| * This should not modify any state if the Nak is bad |
| * or if IPCP is in the LS_OPENED state. |
| * |
| * Returns: |
| * 0 - Nak was bad. |
| * 1 - Nak was good. |
| */ |
| static int |
| ipcp_nakci(fsm *f, u_char *p, int len) |
| { |
| ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| u_char cimaxslotindex, cicflag; |
| u_char citype, cilen, *next; |
| u_short cishort; |
| u32_t ciaddr1, ciaddr2, l, cidnsaddr; |
| ipcp_options no; /* options we've seen Naks for */ |
| ipcp_options try; /* options to request next time */ |
| |
| BZERO(&no, sizeof(no)); |
| try = *go; |
| |
| /* |
| * Any Nak'd CIs must be in exactly the same order that we sent. |
| * Check packet length and CI length at each step. |
| * If we find any deviations, then this packet is bad. |
| */ |
| #define NAKCIADDR(opt, neg, old, code) \ |
| if (go->neg && \ |
| len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \ |
| p[1] == cilen && \ |
| p[0] == opt) { \ |
| len -= cilen; \ |
| INCPTR(2, p); \ |
| GETLONG(l, p); \ |
| ciaddr1 = htonl(l); \ |
| if (old) { \ |
| GETLONG(l, p); \ |
| ciaddr2 = htonl(l); \ |
| no.old_addrs = 1; \ |
| } else { \ |
| ciaddr2 = 0; \ |
| } \ |
| no.neg = 1; \ |
| code \ |
| } |
| |
| #define NAKCIVJ(opt, neg, code) \ |
| if (go->neg && \ |
| ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \ |
| len >= cilen && \ |
| p[0] == opt) { \ |
| len -= cilen; \ |
| INCPTR(2, p); \ |
| GETSHORT(cishort, p); \ |
| no.neg = 1; \ |
| code \ |
| } |
| |
| #define NAKCIDNS(opt, neg, code) \ |
| if (go->neg && \ |
| ((cilen = p[1]) == CILEN_ADDR) && \ |
| len >= cilen && \ |
| p[0] == opt) { \ |
| len -= cilen; \ |
| INCPTR(2, p); \ |
| GETLONG(l, p); \ |
| cidnsaddr = htonl(l); \ |
| no.neg = 1; \ |
| code \ |
| } |
| |
| /* |
| * Accept the peer's idea of {our,his} address, if different |
| * from our idea, only if the accept_{local,remote} flag is set. |
| */ |
| NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs, |
| if (go->accept_local && ciaddr1) { /* Do we know our address? */ |
| try.ouraddr = ciaddr1; |
| IPCPDEBUG(LOG_INFO, ("local IP address %s\n", |
| inet_ntoa(ciaddr1))); |
| } |
| if (go->accept_remote && ciaddr2) { /* Does he know his? */ |
| try.hisaddr = ciaddr2; |
| IPCPDEBUG(LOG_INFO, ("remote IP address %s\n", |
| inet_ntoa(ciaddr2))); |
| } |
| ); |
| |
| /* |
| * Accept the peer's value of maxslotindex provided that it |
| * is less than what we asked for. Turn off slot-ID compression |
| * if the peer wants. Send old-style compress-type option if |
| * the peer wants. |
| */ |
| NAKCIVJ(CI_COMPRESSTYPE, neg_vj, |
| if (cilen == CILEN_VJ) { |
| GETCHAR(cimaxslotindex, p); |
| GETCHAR(cicflag, p); |
| if (cishort == IPCP_VJ_COMP) { |
| try.old_vj = 0; |
| if (cimaxslotindex < go->maxslotindex) { |
| try.maxslotindex = cimaxslotindex; |
| } |
| if (!cicflag) { |
| try.cflag = 0; |
| } |
| } else { |
| try.neg_vj = 0; |
| } |
| } else { |
| if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) { |
| try.old_vj = 1; |
| try.vj_protocol = cishort; |
| } else { |
| try.neg_vj = 0; |
| } |
| } |
| ); |
| |
| NAKCIDNS(CI_MS_DNS1, req_dns1, |
| try.dnsaddr[0] = cidnsaddr; |
| IPCPDEBUG(LOG_INFO, ("primary DNS address %s\n", inet_ntoa(cidnsaddr))); |
| ); |
| |
| NAKCIDNS(CI_MS_DNS2, req_dns2, |
| try.dnsaddr[1] = cidnsaddr; |
| IPCPDEBUG(LOG_INFO, ("secondary DNS address %s\n", inet_ntoa(cidnsaddr))); |
| ); |
| |
| /* |
| * There may be remaining CIs, if the peer is requesting negotiation |
| * on an option that we didn't include in our request packet. |
| * If they want to negotiate about IP addresses, we comply. |
| * If they want us to ask for compression, we refuse. |
| */ |
| while (len > CILEN_VOID) { |
| GETCHAR(citype, p); |
| GETCHAR(cilen, p); |
| if( (len -= cilen) < 0 ) { |
| goto bad; |
| } |
| next = p + cilen - 2; |
| |
| switch (citype) { |
| case CI_COMPRESSTYPE: |
| if (go->neg_vj || no.neg_vj || |
| (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) { |
| goto bad; |
| } |
| no.neg_vj = 1; |
| break; |
| case CI_ADDRS: |
| if ((go->neg_addr && go->old_addrs) || no.old_addrs |
| || cilen != CILEN_ADDRS) { |
| goto bad; |
| } |
| try.neg_addr = 1; |
| try.old_addrs = 1; |
| GETLONG(l, p); |
| ciaddr1 = htonl(l); |
| if (ciaddr1 && go->accept_local) { |
| try.ouraddr = ciaddr1; |
| } |
| GETLONG(l, p); |
| ciaddr2 = htonl(l); |
| if (ciaddr2 && go->accept_remote) { |
| try.hisaddr = ciaddr2; |
| } |
| no.old_addrs = 1; |
| break; |
| case CI_ADDR: |
| if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) { |
| goto bad; |
| } |
| try.old_addrs = 0; |
| GETLONG(l, p); |
| ciaddr1 = htonl(l); |
| if (ciaddr1 && go->accept_local) { |
| try.ouraddr = ciaddr1; |
| } |
| if (try.ouraddr != 0) { |
| try.neg_addr = 1; |
| } |
| no.neg_addr = 1; |
| break; |
| } |
| p = next; |
| } |
| |
| /* If there is still anything left, this packet is bad. */ |
| if (len != 0) { |
| goto bad; |
| } |
| |
| /* |
| * OK, the Nak is good. Now we can update state. |
| */ |
| if (f->state != LS_OPENED) { |
| *go = try; |
| } |
| |
| return 1; |
| |
| bad: |
| IPCPDEBUG(LOG_INFO, ("ipcp_nakci: received bad Nak!\n")); |
| return 0; |
| } |
| |
| |
| /* |
| * ipcp_rejci - Reject some of our CIs. |
| */ |
| static int |
| ipcp_rejci(fsm *f, u_char *p, int len) |
| { |
| ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| u_char cimaxslotindex, ciflag, cilen; |
| u_short cishort; |
| u32_t cilong; |
| ipcp_options try; /* options to request next time */ |
| |
| try = *go; |
| /* |
| * Any Rejected CIs must be in exactly the same order that we sent. |
| * Check packet length and CI length at each step. |
| * If we find any deviations, then this packet is bad. |
| */ |
| #define REJCIADDR(opt, neg, old, val1, val2) \ |
| if (go->neg && \ |
| len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \ |
| p[1] == cilen && \ |
| p[0] == opt) { \ |
| u32_t l; \ |
| len -= cilen; \ |
| INCPTR(2, p); \ |
| GETLONG(l, p); \ |
| cilong = htonl(l); \ |
| /* Check rejected value. */ \ |
| if (cilong != val1) { \ |
| goto bad; \ |
| } \ |
| if (old) { \ |
| GETLONG(l, p); \ |
| cilong = htonl(l); \ |
| /* Check rejected value. */ \ |
| if (cilong != val2) { \ |
| goto bad; \ |
| } \ |
| } \ |
| try.neg = 0; \ |
| } |
| |
| #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \ |
| if (go->neg && \ |
| p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \ |
| len >= p[1] && \ |
| p[0] == opt) { \ |
| len -= p[1]; \ |
| INCPTR(2, p); \ |
| GETSHORT(cishort, p); \ |
| /* Check rejected value. */ \ |
| if (cishort != val) { \ |
| goto bad; \ |
| } \ |
| if (!old) { \ |
| GETCHAR(cimaxslotindex, p); \ |
| if (cimaxslotindex != maxslot) { \ |
| goto bad; \ |
| } \ |
| GETCHAR(ciflag, p); \ |
| if (ciflag != cflag) { \ |
| goto bad; \ |
| } \ |
| } \ |
| try.neg = 0; \ |
| } |
| |
| #define REJCIDNS(opt, neg, dnsaddr) \ |
| if (go->neg && \ |
| ((cilen = p[1]) == CILEN_ADDR) && \ |
| len >= cilen && \ |
| p[0] == opt) { \ |
| u32_t l; \ |
| len -= cilen; \ |
| INCPTR(2, p); \ |
| GETLONG(l, p); \ |
| cilong = htonl(l); \ |
| /* Check rejected value. */ \ |
| if (cilong != dnsaddr) { \ |
| goto bad; \ |
| } \ |
| try.neg = 0; \ |
| } |
| |
| REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, |
| go->old_addrs, go->ouraddr, go->hisaddr); |
| |
| REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj, |
| go->maxslotindex, go->cflag); |
| |
| REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]); |
| |
| REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]); |
| |
| /* |
| * If there are any remaining CIs, then this packet is bad. |
| */ |
| if (len != 0) { |
| goto bad; |
| } |
| /* |
| * Now we can update state. |
| */ |
| if (f->state != LS_OPENED) { |
| *go = try; |
| } |
| return 1; |
| |
| bad: |
| IPCPDEBUG(LOG_INFO, ("ipcp_rejci: received bad Reject!\n")); |
| return 0; |
| } |
| |
| |
| /* |
| * ipcp_reqci - Check the peer's requested CIs and send appropriate response. |
| * |
| * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified |
| * appropriately. If reject_if_disagree is non-zero, doesn't return |
| * CONFNAK; returns CONFREJ if it can't return CONFACK. |
| */ |
| static int |
| ipcp_reqci(fsm *f, u_char *inp/* Requested CIs */,int *len/* Length of requested CIs */,int reject_if_disagree) |
| { |
| ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
| ipcp_options *ao = &ipcp_allowoptions[f->unit]; |
| #ifdef OLD_CI_ADDRS |
| ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| #endif |
| u_char *cip, *next; /* Pointer to current and next CIs */ |
| u_short cilen, citype; /* Parsed len, type */ |
| u_short cishort; /* Parsed short value */ |
| u32_t tl, ciaddr1; /* Parsed address values */ |
| #ifdef OLD_CI_ADDRS |
| u32_t ciaddr2; /* Parsed address values */ |
| #endif |
| int rc = CONFACK; /* Final packet return code */ |
| int orc; /* Individual option return code */ |
| u_char *p; /* Pointer to next char to parse */ |
| u_char *ucp = inp; /* Pointer to current output char */ |
| int l = *len; /* Length left */ |
| u_char maxslotindex, cflag; |
| int d; |
| |
| cis_received[f->unit] = 1; |
| |
| /* |
| * Reset all his options. |
| */ |
| BZERO(ho, sizeof(*ho)); |
| |
| /* |
| * Process all his options. |
| */ |
| next = inp; |
| while (l) { |
| orc = CONFACK; /* Assume success */ |
| cip = p = next; /* Remember begining of CI */ |
| if (l < 2 || /* Not enough data for CI header or */ |
| p[1] < 2 || /* CI length too small or */ |
| p[1] > l) { /* CI length too big? */ |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: bad CI length!\n")); |
| orc = CONFREJ; /* Reject bad CI */ |
| cilen = (u_short)l;/* Reject till end of packet */ |
| l = 0; /* Don't loop again */ |
| goto endswitch; |
| } |
| GETCHAR(citype, p); /* Parse CI type */ |
| GETCHAR(cilen, p); /* Parse CI length */ |
| l -= cilen; /* Adjust remaining length */ |
| next += cilen; /* Step to next CI */ |
| |
| switch (citype) { /* Check CI type */ |
| #ifdef OLD_CI_ADDRS /* Need to save space... */ |
| case CI_ADDRS: |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received ADDRS\n")); |
| if (!ao->neg_addr || |
| cilen != CILEN_ADDRS) { /* Check CI length */ |
| orc = CONFREJ; /* Reject CI */ |
| break; |
| } |
| |
| /* |
| * If he has no address, or if we both have his address but |
| * disagree about it, then NAK it with our idea. |
| * In particular, if we don't know his address, but he does, |
| * then accept it. |
| */ |
| GETLONG(tl, p); /* Parse source address (his) */ |
| ciaddr1 = htonl(tl); |
| IPCPDEBUG(LOG_INFO, ("his addr %s\n", inet_ntoa(ciaddr1))); |
| if (ciaddr1 != wo->hisaddr |
| && (ciaddr1 == 0 || !wo->accept_remote)) { |
| orc = CONFNAK; |
| if (!reject_if_disagree) { |
| DECPTR(sizeof(u32_t), p); |
| tl = ntohl(wo->hisaddr); |
| PUTLONG(tl, p); |
| } |
| } else if (ciaddr1 == 0 && wo->hisaddr == 0) { |
| /* |
| * If neither we nor he knows his address, reject the option. |
| */ |
| orc = CONFREJ; |
| wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ |
| break; |
| } |
| |
| /* |
| * If he doesn't know our address, or if we both have our address |
| * but disagree about it, then NAK it with our idea. |
| */ |
| GETLONG(tl, p); /* Parse desination address (ours) */ |
| ciaddr2 = htonl(tl); |
| IPCPDEBUG(LOG_INFO, ("our addr %s\n", inet_ntoa(ciaddr2))); |
| if (ciaddr2 != wo->ouraddr) { |
| if (ciaddr2 == 0 || !wo->accept_local) { |
| orc = CONFNAK; |
| if (!reject_if_disagree) { |
| DECPTR(sizeof(u32_t), p); |
| tl = ntohl(wo->ouraddr); |
| PUTLONG(tl, p); |
| } |
| } else { |
| go->ouraddr = ciaddr2; /* accept peer's idea */ |
| } |
| } |
| |
| ho->neg_addr = 1; |
| ho->old_addrs = 1; |
| ho->hisaddr = ciaddr1; |
| ho->ouraddr = ciaddr2; |
| break; |
| #endif |
| |
| case CI_ADDR: |
| if (!ao->neg_addr) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR not allowed\n")); |
| orc = CONFREJ; /* Reject CI */ |
| break; |
| } else if (cilen != CILEN_ADDR) { /* Check CI length */ |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR bad len\n")); |
| orc = CONFREJ; /* Reject CI */ |
| break; |
| } |
| |
| /* |
| * If he has no address, or if we both have his address but |
| * disagree about it, then NAK it with our idea. |
| * In particular, if we don't know his address, but he does, |
| * then accept it. |
| */ |
| GETLONG(tl, p); /* Parse source address (his) */ |
| ciaddr1 = htonl(tl); |
| if (ciaddr1 != wo->hisaddr |
| && (ciaddr1 == 0 || !wo->accept_remote)) { |
| orc = CONFNAK; |
| if (!reject_if_disagree) { |
| DECPTR(sizeof(u32_t), p); |
| tl = ntohl(wo->hisaddr); |
| PUTLONG(tl, p); |
| } |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Nak ADDR %s\n", inet_ntoa(ciaddr1))); |
| } else if (ciaddr1 == 0 && wo->hisaddr == 0) { |
| /* |
| * Don't ACK an address of 0.0.0.0 - reject it instead. |
| */ |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR %s\n", inet_ntoa(ciaddr1))); |
| orc = CONFREJ; |
| wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ |
| break; |
| } |
| |
| ho->neg_addr = 1; |
| ho->hisaddr = ciaddr1; |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: ADDR %s\n", inet_ntoa(ciaddr1))); |
| break; |
| |
| case CI_MS_DNS1: |
| case CI_MS_DNS2: |
| /* Microsoft primary or secondary DNS request */ |
| d = citype == CI_MS_DNS2; |
| |
| /* If we do not have a DNS address then we cannot send it */ |
| if (ao->dnsaddr[d] == 0 || |
| cilen != CILEN_ADDR) { /* Check CI length */ |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting DNS%d Request\n", d+1)); |
| orc = CONFREJ; /* Reject CI */ |
| break; |
| } |
| GETLONG(tl, p); |
| if (htonl(tl) != ao->dnsaddr[d]) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking DNS%d Request %s\n", |
| d+1, inet_ntoa(tl))); |
| DECPTR(sizeof(u32_t), p); |
| tl = ntohl(ao->dnsaddr[d]); |
| PUTLONG(tl, p); |
| orc = CONFNAK; |
| } |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received DNS%d Request\n", d+1)); |
| break; |
| |
| case CI_MS_WINS1: |
| case CI_MS_WINS2: |
| /* Microsoft primary or secondary WINS request */ |
| d = citype == CI_MS_WINS2; |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received WINS%d Request\n", d+1)); |
| |
| /* If we do not have a DNS address then we cannot send it */ |
| if (ao->winsaddr[d] == 0 || |
| cilen != CILEN_ADDR) { /* Check CI length */ |
| orc = CONFREJ; /* Reject CI */ |
| break; |
| } |
| GETLONG(tl, p); |
| if (htonl(tl) != ao->winsaddr[d]) { |
| DECPTR(sizeof(u32_t), p); |
| tl = ntohl(ao->winsaddr[d]); |
| PUTLONG(tl, p); |
| orc = CONFNAK; |
| } |
| break; |
| |
| case CI_COMPRESSTYPE: |
| if (!ao->neg_vj) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE not allowed\n")); |
| orc = CONFREJ; |
| break; |
| } else if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE len=%d\n", cilen)); |
| orc = CONFREJ; |
| break; |
| } |
| GETSHORT(cishort, p); |
| |
| if (!(cishort == IPCP_VJ_COMP || |
| (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE %d\n", cishort)); |
| orc = CONFREJ; |
| break; |
| } |
| |
| ho->neg_vj = 1; |
| ho->vj_protocol = cishort; |
| if (cilen == CILEN_VJ) { |
| GETCHAR(maxslotindex, p); |
| if (maxslotindex > ao->maxslotindex) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ max slot %d\n", maxslotindex)); |
| orc = CONFNAK; |
| if (!reject_if_disagree) { |
| DECPTR(1, p); |
| PUTCHAR(ao->maxslotindex, p); |
| } |
| } |
| GETCHAR(cflag, p); |
| if (cflag && !ao->cflag) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ cflag %d\n", cflag)); |
| orc = CONFNAK; |
| if (!reject_if_disagree) { |
| DECPTR(1, p); |
| PUTCHAR(wo->cflag, p); |
| } |
| } |
| ho->maxslotindex = maxslotindex; |
| ho->cflag = cflag; |
| } else { |
| ho->old_vj = 1; |
| ho->maxslotindex = MAX_SLOTS - 1; |
| ho->cflag = 1; |
| } |
| IPCPDEBUG(LOG_INFO, ( |
| "ipcp_reqci: received COMPRESSTYPE p=%d old=%d maxslot=%d cflag=%d\n", |
| ho->vj_protocol, ho->old_vj, ho->maxslotindex, ho->cflag)); |
| break; |
| |
| default: |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting unknown CI type %d\n", citype)); |
| orc = CONFREJ; |
| break; |
| } |
| |
| endswitch: |
| if (orc == CONFACK && /* Good CI */ |
| rc != CONFACK) { /* but prior CI wasnt? */ |
| continue; /* Don't send this one */ |
| } |
| |
| if (orc == CONFNAK) { /* Nak this CI? */ |
| if (reject_if_disagree) { /* Getting fed up with sending NAKs? */ |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting too many naks\n")); |
| orc = CONFREJ; /* Get tough if so */ |
| } else { |
| if (rc == CONFREJ) { /* Rejecting prior CI? */ |
| continue; /* Don't send this one */ |
| } |
| if (rc == CONFACK) { /* Ack'd all prior CIs? */ |
| rc = CONFNAK; /* Not anymore... */ |
| ucp = inp; /* Backup */ |
| } |
| } |
| } |
| |
| if (orc == CONFREJ && /* Reject this CI */ |
| rc != CONFREJ) { /* but no prior ones? */ |
| rc = CONFREJ; |
| ucp = inp; /* Backup */ |
| } |
| |
| /* Need to move CI? */ |
| if (ucp != cip) { |
| BCOPY(cip, ucp, cilen); /* Move it */ |
| } |
| |
| /* Update output pointer */ |
| INCPTR(cilen, ucp); |
| } |
| |
| /* |
| * If we aren't rejecting this packet, and we want to negotiate |
| * their address, and they didn't send their address, then we |
| * send a NAK with a CI_ADDR option appended. We assume the |
| * input buffer is long enough that we can append the extra |
| * option safely. |
| */ |
| if (rc != CONFREJ && !ho->neg_addr && |
| wo->req_addr && !reject_if_disagree) { |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Requesting peer address\n")); |
| if (rc == CONFACK) { |
| rc = CONFNAK; |
| ucp = inp; /* reset pointer */ |
| wo->req_addr = 0; /* don't ask again */ |
| } |
| PUTCHAR(CI_ADDR, ucp); |
| PUTCHAR(CILEN_ADDR, ucp); |
| tl = ntohl(wo->hisaddr); |
| PUTLONG(tl, ucp); |
| } |
| |
| *len = (int)(ucp - inp); /* Compute output length */ |
| IPCPDEBUG(LOG_INFO, ("ipcp_reqci: returning Configure-%s\n", CODENAME(rc))); |
| return (rc); /* Return final code */ |
| } |
| |
| |
| #if 0 |
| /* |
| * ip_check_options - check that any IP-related options are OK, |
| * and assign appropriate defaults. |
| */ |
| static void |
| ip_check_options(u_long localAddr) |
| { |
| ipcp_options *wo = &ipcp_wantoptions[0]; |
| |
| /* |
| * Load our default IP address but allow the remote host to give us |
| * a new address. |
| */ |
| if (wo->ouraddr == 0 && !ppp_settings.disable_defaultip) { |
| wo->accept_local = 1; /* don't insist on this default value */ |
| wo->ouraddr = htonl(localAddr); |
| } |
| } |
| #endif |
| |
| |
| /* |
| * ipcp_up - IPCP has come UP. |
| * |
| * Configure the IP network interface appropriately and bring it up. |
| */ |
| static void |
| ipcp_up(fsm *f) |
| { |
| u32_t mask; |
| ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
| ipcp_options *go = &ipcp_gotoptions[f->unit]; |
| ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
| |
| np_up(f->unit, PPP_IP); |
| IPCPDEBUG(LOG_INFO, ("ipcp: up\n")); |
| |
| /* |
| * We must have a non-zero IP address for both ends of the link. |
| */ |
| if (!ho->neg_addr) { |
| ho->hisaddr = wo->hisaddr; |
| } |
| |
| if (ho->hisaddr == 0) { |
| IPCPDEBUG(LOG_ERR, ("Could not determine remote IP address\n")); |
| ipcp_close(f->unit, "Could not determine remote IP address"); |
| return; |
| } |
| if (go->ouraddr == 0) { |
| IPCPDEBUG(LOG_ERR, ("Could not determine local IP address\n")); |
| ipcp_close(f->unit, "Could not determine local IP address"); |
| return; |
| } |
| |
| if (ppp_settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) { |
| /*pppGotDNSAddrs(go->dnsaddr[0], go->dnsaddr[1]);*/ |
| } |
| |
| /* |
| * Check that the peer is allowed to use the IP address it wants. |
| */ |
| if (!auth_ip_addr(f->unit, ho->hisaddr)) { |
| IPCPDEBUG(LOG_ERR, ("Peer is not authorized to use remote address %s\n", |
| inet_ntoa(ho->hisaddr))); |
| ipcp_close(f->unit, "Unauthorized remote IP address"); |
| return; |
| } |
| |
| /* set tcp compression */ |
| sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex); |
| |
| /* |
| * Set IP addresses and (if specified) netmask. |
| */ |
| mask = GetMask(go->ouraddr); |
| |
| if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask, go->dnsaddr[0], go->dnsaddr[1])) { |
| IPCPDEBUG(LOG_WARNING, ("sifaddr failed\n")); |
| ipcp_close(f->unit, "Interface configuration failed"); |
| return; |
| } |
| |
| /* bring the interface up for IP */ |
| if (!sifup(f->unit)) { |
| IPCPDEBUG(LOG_WARNING, ("sifup failed\n")); |
| ipcp_close(f->unit, "Interface configuration failed"); |
| return; |
| } |
| |
| sifnpmode(f->unit, PPP_IP, NPMODE_PASS); |
| |
| /* assign a default route through the interface if required */ |
| if (ipcp_wantoptions[f->unit].default_route) { |
| if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) { |
| default_route_set[f->unit] = 1; |
| } |
| } |
| |
| IPCPDEBUG(LOG_NOTICE, ("local IP address %s\n", inet_ntoa(go->ouraddr))); |
| IPCPDEBUG(LOG_NOTICE, ("remote IP address %s\n", inet_ntoa(ho->hisaddr))); |
| if (go->dnsaddr[0]) { |
| IPCPDEBUG(LOG_NOTICE, ("primary DNS address %s\n", inet_ntoa(go->dnsaddr[0]))); |
| } |
| if (go->dnsaddr[1]) { |
| IPCPDEBUG(LOG_NOTICE, ("secondary DNS address %s\n", inet_ntoa(go->dnsaddr[1]))); |
| } |
| } |
| |
| |
| /* |
| * ipcp_down - IPCP has gone DOWN. |
| * |
| * Take the IP network interface down, clear its addresses |
| * and delete routes through it. |
| */ |
| static void |
| ipcp_down(fsm *f) |
| { |
| IPCPDEBUG(LOG_INFO, ("ipcp: down\n")); |
| np_down(f->unit, PPP_IP); |
| sifvjcomp(f->unit, 0, 0, 0); |
| |
| sifdown(f->unit); |
| ipcp_clear_addrs(f->unit); |
| } |
| |
| |
| /* |
| * ipcp_clear_addrs() - clear the interface addresses, routes, etc. |
| */ |
| static void |
| ipcp_clear_addrs(int unit) |
| { |
| u32_t ouraddr, hisaddr; |
| |
| ouraddr = ipcp_gotoptions[unit].ouraddr; |
| hisaddr = ipcp_hisoptions[unit].hisaddr; |
| if (default_route_set[unit]) { |
| cifdefaultroute(unit, ouraddr, hisaddr); |
| default_route_set[unit] = 0; |
| } |
| cifaddr(unit, ouraddr, hisaddr); |
| } |
| |
| |
| /* |
| * ipcp_finished - possibly shut down the lower layers. |
| */ |
| static void |
| ipcp_finished(fsm *f) |
| { |
| np_finished(f->unit, PPP_IP); |
| } |
| |
| #if PPP_ADDITIONAL_CALLBACKS |
| static int |
| ipcp_printpkt(u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg) |
| { |
| LWIP_UNUSED_ARG(p); |
| LWIP_UNUSED_ARG(plen); |
| LWIP_UNUSED_ARG(printer); |
| LWIP_UNUSED_ARG(arg); |
| return 0; |
| } |
| |
| /* |
| * ip_active_pkt - see if this IP packet is worth bringing the link up for. |
| * We don't bring the link up for IP fragments or for TCP FIN packets |
| * with no data. |
| */ |
| #define IP_HDRLEN 20 /* bytes */ |
| #define IP_OFFMASK 0x1fff |
| #define IPPROTO_TCP 6 |
| #define TCP_HDRLEN 20 |
| #define TH_FIN 0x01 |
| |
| /* |
| * We use these macros because the IP header may be at an odd address, |
| * and some compilers might use word loads to get th_off or ip_hl. |
| */ |
| |
| #define net_short(x) (((x)[0] << 8) + (x)[1]) |
| #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF) |
| #define get_ipoff(x) net_short((unsigned char *)(x) + 6) |
| #define get_ipproto(x) (((unsigned char *)(x))[9]) |
| #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) |
| #define get_tcpflags(x) (((unsigned char *)(x))[13]) |
| |
| static int |
| ip_active_pkt(u_char *pkt, int len) |
| { |
| u_char *tcp; |
| int hlen; |
| |
| len -= PPP_HDRLEN; |
| pkt += PPP_HDRLEN; |
| if (len < IP_HDRLEN) { |
| return 0; |
| } |
| if ((get_ipoff(pkt) & IP_OFFMASK) != 0) { |
| return 0; |
| } |
| if (get_ipproto(pkt) != IPPROTO_TCP) { |
| return 1; |
| } |
| hlen = get_iphl(pkt) * 4; |
| if (len < hlen + TCP_HDRLEN) { |
| return 0; |
| } |
| tcp = pkt + hlen; |
| if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) { |
| return 0; |
| } |
| return 1; |
| } |
| #endif /* PPP_ADDITIONAL_CALLBACKS */ |
| |
| #endif /* PPP_SUPPORT */ |
