diff options
Diffstat (limited to 'mdk-stage1/ppp/pppd/ipv6cp.c')
| -rw-r--r-- | mdk-stage1/ppp/pppd/ipv6cp.c | 1512 |
1 files changed, 0 insertions, 1512 deletions
diff --git a/mdk-stage1/ppp/pppd/ipv6cp.c b/mdk-stage1/ppp/pppd/ipv6cp.c deleted file mode 100644 index 54ff7d7d8..000000000 --- a/mdk-stage1/ppp/pppd/ipv6cp.c +++ /dev/null @@ -1,1512 +0,0 @@ -/* - ipv6cp.c - PPP IPV6 Control Protocol. - Copyright (C) 1999 Tommi Komulainen <Tommi.Komulainen@iki.fi> - - 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. The name of the author 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. -*/ - -/* Original version, based on RFC2023 : - - Copyright (c) 1995, 1996, 1997 Francis.Dupont@inria.fr, INRIA Rocquencourt, - Alain.Durand@imag.fr, IMAG, - Jean-Luc.Richier@imag.fr, IMAG-LSR. - - Copyright (c) 1998, 1999 Francis.Dupont@inria.fr, GIE DYADE, - Alain.Durand@imag.fr, IMAG, - Jean-Luc.Richier@imag.fr, IMAG-LSR. - - Ce travail a été fait au sein du GIE DYADE (Groupement d'Intérêt - Économique ayant pour membres BULL S.A. et l'INRIA). - - Ce logiciel informatique est disponible aux conditions - usuelles dans la recherche, c'est-à-dire qu'il peut - être utilisé, copié, modifié, distribué à l'unique - condition que ce texte soit conservé afin que - l'origine de ce logiciel soit reconnue. - - Le nom de l'Institut National de Recherche en Informatique - et en Automatique (INRIA), de l'IMAG, ou d'une personne morale - ou physique ayant participé à l'élaboration de ce logiciel ne peut - être utilisé sans son accord préalable explicite. - - Ce logiciel est fourni tel quel sans aucune garantie, - support ou responsabilité d'aucune sorte. - Ce logiciel est dérivé de sources d'origine - "University of California at Berkeley" et - "Digital Equipment Corporation" couvertes par des copyrights. - - L'Institut d'Informatique et de Mathématiques Appliquées de Grenoble (IMAG) - est une fédération d'unités mixtes de recherche du CNRS, de l'Institut National - Polytechnique de Grenoble et de l'Université Joseph Fourier regroupant - sept laboratoires dont le laboratoire Logiciels, Systèmes, Réseaux (LSR). - - This work has been done in the context of GIE DYADE (joint R & D venture - between BULL S.A. and INRIA). - - This software is available with usual "research" terms - with the aim of retain credits of the software. - Permission to use, copy, modify and distribute this software for any - purpose and without fee is hereby granted, provided that the above - copyright notice and this permission notice appear in all copies, - and the name of INRIA, IMAG, or any contributor not be used in advertising - or publicity pertaining to this material without the prior explicit - permission. The software is provided "as is" without any - warranties, support or liabilities of any kind. - This software is derived from source code from - "University of California at Berkeley" and - "Digital Equipment Corporation" protected by copyrights. - - Grenoble's Institute of Computer Science and Applied Mathematics (IMAG) - is a federation of seven research units funded by the CNRS, National - Polytechnic Institute of Grenoble and University Joseph Fourier. - The research unit in Software, Systems, Networks (LSR) is member of IMAG. -*/ - -/* - * Derived from : - * - * - * 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. - * - * $Id$ - */ - -#define RCSID "$Id$" - -/* - * TODO: - * - * Proxy Neighbour Discovery. - * - * Better defines for selecting the ordering of - * interface up / set address. (currently checks for __linux__, - * since SVR4 && (SNI || __USLC__) didn't work properly) - */ - -#include <stdio.h> -#include <string.h> -#include <unistd.h> -#include <netdb.h> -#include <sys/param.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <arpa/inet.h> - -#include "pppd.h" -#include "fsm.h" -#include "ipcp.h" -#include "ipv6cp.h" -#include "magic.h" -#include "pathnames.h" - -static const char rcsid[] = RCSID; - -/* global vars */ -ipv6cp_options ipv6cp_wantoptions[NUM_PPP]; /* Options that we want to request */ -ipv6cp_options ipv6cp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ -ipv6cp_options ipv6cp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ -ipv6cp_options ipv6cp_hisoptions[NUM_PPP]; /* Options that we ack'd */ -int no_ifaceid_neg = 0; - -/* local vars */ -static int ipv6cp_is_up; - -/* - * Callbacks for fsm code. (CI = Configuration Information) - */ -static void ipv6cp_resetci __P((fsm *)); /* Reset our CI */ -static int ipv6cp_cilen __P((fsm *)); /* Return length of our CI */ -static void ipv6cp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ -static int ipv6cp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ -static int ipv6cp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ -static int ipv6cp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ -static int ipv6cp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ -static void ipv6cp_up __P((fsm *)); /* We're UP */ -static void ipv6cp_down __P((fsm *)); /* We're DOWN */ -static void ipv6cp_finished __P((fsm *)); /* Don't need lower layer */ - -fsm ipv6cp_fsm[NUM_PPP]; /* IPV6CP fsm structure */ - -static fsm_callbacks ipv6cp_callbacks = { /* IPV6CP callback routines */ - ipv6cp_resetci, /* Reset our Configuration Information */ - ipv6cp_cilen, /* Length of our Configuration Information */ - ipv6cp_addci, /* Add our Configuration Information */ - ipv6cp_ackci, /* ACK our Configuration Information */ - ipv6cp_nakci, /* NAK our Configuration Information */ - ipv6cp_rejci, /* Reject our Configuration Information */ - ipv6cp_reqci, /* Request peer's Configuration Information */ - ipv6cp_up, /* Called when fsm reaches OPENED state */ - ipv6cp_down, /* Called when fsm leaves OPENED state */ - NULL, /* Called when we want the lower layer up */ - ipv6cp_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 */ - "IPV6CP" /* String name of protocol */ -}; - -/* - * Command-line options. - */ -static int setifaceid __P((char **arg)); -static void printifaceid __P((option_t *, - void (*)(void *, char *, ...), void *)); - -static option_t ipv6cp_option_list[] = { - { "ipv6", o_special, (void *)setifaceid, - "Set interface identifiers for IPV6", - OPT_A2PRINTER, (void *)printifaceid }, - - { "+ipv6", o_bool, &ipv6cp_protent.enabled_flag, - "Enable IPv6 and IPv6CP", OPT_PRIO | 1 }, - { "noipv6", o_bool, &ipv6cp_protent.enabled_flag, - "Disable IPv6 and IPv6CP", OPT_PRIOSUB }, - { "-ipv6", o_bool, &ipv6cp_protent.enabled_flag, - "Disable IPv6 and IPv6CP", OPT_PRIOSUB | OPT_ALIAS }, - - { "ipv6cp-accept-local", o_bool, &ipv6cp_allowoptions[0].accept_local, - "Accept peer's interface identifier for us", 1 }, - - { "ipv6cp-use-ipaddr", o_bool, &ipv6cp_allowoptions[0].use_ip, - "Use (default) IPv4 address as interface identifier", 1 }, - -#if defined(SOL2) - { "ipv6cp-use-persistent", o_bool, &ipv6cp_wantoptions[0].use_persistent, - "Use uniquely-available persistent value for link local address", 1 }, -#endif /* defined(SOL2) */ - - { "ipv6cp-restart", o_int, &ipv6cp_fsm[0].timeouttime, - "Set timeout for IPv6CP", OPT_PRIO }, - { "ipv6cp-max-terminate", o_int, &ipv6cp_fsm[0].maxtermtransmits, - "Set max #xmits for term-reqs", OPT_PRIO }, - { "ipv6cp-max-configure", o_int, &ipv6cp_fsm[0].maxconfreqtransmits, - "Set max #xmits for conf-reqs", OPT_PRIO }, - { "ipv6cp-max-failure", o_int, &ipv6cp_fsm[0].maxnakloops, - "Set max #conf-naks for IPv6CP", OPT_PRIO }, - - { NULL } -}; - - -/* - * Protocol entry points from main code. - */ -static void ipv6cp_init __P((int)); -static void ipv6cp_open __P((int)); -static void ipv6cp_close __P((int, char *)); -static void ipv6cp_lowerup __P((int)); -static void ipv6cp_lowerdown __P((int)); -static void ipv6cp_input __P((int, u_char *, int)); -static void ipv6cp_protrej __P((int)); -static int ipv6cp_printpkt __P((u_char *, int, - void (*) __P((void *, char *, ...)), void *)); -static void ipv6_check_options __P((void)); -static int ipv6_demand_conf __P((int)); -static int ipv6_active_pkt __P((u_char *, int)); - -struct protent ipv6cp_protent = { - PPP_IPV6CP, - ipv6cp_init, - ipv6cp_input, - ipv6cp_protrej, - ipv6cp_lowerup, - ipv6cp_lowerdown, - ipv6cp_open, - ipv6cp_close, - ipv6cp_printpkt, - NULL, - 0, - "IPV6CP", - "IPV6", - ipv6cp_option_list, - ipv6_check_options, - ipv6_demand_conf, - ipv6_active_pkt -}; - -static void ipv6cp_clear_addrs __P((int, eui64_t, eui64_t)); -static void ipv6cp_script __P((char *)); -static void ipv6cp_script_done __P((void *)); - -/* - * Lengths of configuration options. - */ -#define CILEN_VOID 2 -#define CILEN_COMPRESS 4 /* length for RFC2023 compress opt. */ -#define CILEN_IFACEID 10 /* RFC2472, interface identifier */ - -#define CODENAME(x) ((x) == CONFACK ? "ACK" : \ - (x) == CONFNAK ? "NAK" : "REJ") - -/* - * This state variable is used to ensure that we don't - * run an ipcp-up/down script while one is already running. - */ -static enum script_state { - s_down, - s_up, -} ipv6cp_script_state; -static pid_t ipv6cp_script_pid; - -/* - * setifaceid - set the interface identifiers manually - */ -static int -setifaceid(argv) - char **argv; -{ - char *comma, *arg, c; - ipv6cp_options *wo = &ipv6cp_wantoptions[0]; - struct in6_addr addr; - static int prio_local, prio_remote; - -#define VALIDID(a) ( (((a).s6_addr32[0] == 0) && ((a).s6_addr32[1] == 0)) && \ - (((a).s6_addr32[2] != 0) || ((a).s6_addr32[3] != 0)) ) - - arg = *argv; - if ((comma = strchr(arg, ',')) == NULL) - comma = arg + strlen(arg); - - /* - * If comma first character, then no local identifier - */ - if (comma != arg) { - c = *comma; - *comma = '\0'; - - if (inet_pton(AF_INET6, arg, &addr) == 0 || !VALIDID(addr)) { - option_error("Illegal interface identifier (local): %s", arg); - return 0; - } - - if (option_priority >= prio_local) { - eui64_copy(addr.s6_addr32[2], wo->ourid); - wo->opt_local = 1; - prio_local = option_priority; - } - *comma = c; - } - - /* - * If comma last character, the no remote identifier - */ - if (*comma != 0 && *++comma != '\0') { - if (inet_pton(AF_INET6, comma, &addr) == 0 || !VALIDID(addr)) { - option_error("Illegal interface identifier (remote): %s", comma); - return 0; - } - if (option_priority >= prio_remote) { - eui64_copy(addr.s6_addr32[2], wo->hisid); - wo->opt_remote = 1; - prio_remote = option_priority; - } - } - - if (override_value("+ipv6", option_priority, option_source)) - ipv6cp_protent.enabled_flag = 1; - return 1; -} - -static void -printifaceid(opt, printer, arg) - option_t *opt; - void (*printer) __P((void *, char *, ...)); - void *arg; -{ - ipv6cp_options *wo = &ipv6cp_wantoptions[0]; - - if (wo->opt_local) - printer(arg, "%s", llv6_ntoa(wo->ourid)); - printer(arg, ","); - if (wo->opt_remote) - printer(arg, "%s", llv6_ntoa(wo->hisid)); -} - -/* - * Make a string representation of a network address. - */ -char * -llv6_ntoa(ifaceid) - eui64_t ifaceid; -{ - static char b[64]; - - sprintf(b, "fe80::%s", eui64_ntoa(ifaceid)); - return b; -} - - -/* - * ipv6cp_init - Initialize IPV6CP. - */ -static void -ipv6cp_init(unit) - int unit; -{ - fsm *f = &ipv6cp_fsm[unit]; - ipv6cp_options *wo = &ipv6cp_wantoptions[unit]; - ipv6cp_options *ao = &ipv6cp_allowoptions[unit]; - - f->unit = unit; - f->protocol = PPP_IPV6CP; - f->callbacks = &ipv6cp_callbacks; - fsm_init(&ipv6cp_fsm[unit]); - - memset(wo, 0, sizeof(*wo)); - memset(ao, 0, sizeof(*ao)); - - wo->accept_local = 1; - wo->neg_ifaceid = 1; - ao->neg_ifaceid = 1; - -#ifdef IPV6CP_COMP - wo->neg_vj = 1; - ao->neg_vj = 1; - wo->vj_protocol = IPV6CP_COMP; -#endif - -} - - -/* - * ipv6cp_open - IPV6CP is allowed to come up. - */ -static void -ipv6cp_open(unit) - int unit; -{ - fsm_open(&ipv6cp_fsm[unit]); -} - - -/* - * ipv6cp_close - Take IPV6CP down. - */ -static void -ipv6cp_close(unit, reason) - int unit; - char *reason; -{ - fsm_close(&ipv6cp_fsm[unit], reason); -} - - -/* - * ipv6cp_lowerup - The lower layer is up. - */ -static void -ipv6cp_lowerup(unit) - int unit; -{ - fsm_lowerup(&ipv6cp_fsm[unit]); -} - - -/* - * ipv6cp_lowerdown - The lower layer is down. - */ -static void -ipv6cp_lowerdown(unit) - int unit; -{ - fsm_lowerdown(&ipv6cp_fsm[unit]); -} - - -/* - * ipv6cp_input - Input IPV6CP packet. - */ -static void -ipv6cp_input(unit, p, len) - int unit; - u_char *p; - int len; -{ - fsm_input(&ipv6cp_fsm[unit], p, len); -} - - -/* - * ipv6cp_protrej - A Protocol-Reject was received for IPV6CP. - * - * Pretend the lower layer went down, so we shut up. - */ -static void -ipv6cp_protrej(unit) - int unit; -{ - fsm_lowerdown(&ipv6cp_fsm[unit]); -} - - -/* - * ipv6cp_resetci - Reset our CI. - */ -static void -ipv6cp_resetci(f) - fsm *f; -{ - ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - - wo->req_ifaceid = wo->neg_ifaceid && ipv6cp_allowoptions[f->unit].neg_ifaceid; - - if (!wo->opt_local) { - eui64_magic_nz(wo->ourid); - } - - *go = *wo; - eui64_zero(go->hisid); /* last proposed interface identifier */ -} - - -/* - * ipv6cp_cilen - Return length of our CI. - */ -static int -ipv6cp_cilen(f) - fsm *f; -{ - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - -#define LENCIVJ(neg) (neg ? CILEN_COMPRESS : 0) -#define LENCIIFACEID(neg) (neg ? CILEN_IFACEID : 0) - - return (LENCIIFACEID(go->neg_ifaceid) + - LENCIVJ(go->neg_vj)); -} - - -/* - * ipv6cp_addci - Add our desired CIs to a packet. - */ -static void -ipv6cp_addci(f, ucp, lenp) - fsm *f; - u_char *ucp; - int *lenp; -{ - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - int len = *lenp; - -#define ADDCIVJ(opt, neg, val) \ - if (neg) { \ - int vjlen = CILEN_COMPRESS; \ - if (len >= vjlen) { \ - PUTCHAR(opt, ucp); \ - PUTCHAR(vjlen, ucp); \ - PUTSHORT(val, ucp); \ - len -= vjlen; \ - } else \ - neg = 0; \ - } - -#define ADDCIIFACEID(opt, neg, val1) \ - if (neg) { \ - int idlen = CILEN_IFACEID; \ - if (len >= idlen) { \ - PUTCHAR(opt, ucp); \ - PUTCHAR(idlen, ucp); \ - eui64_put(val1, ucp); \ - len -= idlen; \ - } else \ - neg = 0; \ - } - - ADDCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); - - ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); - - *lenp -= len; -} - - -/* - * ipv6cp_ackci - Ack our CIs. - * - * Returns: - * 0 - Ack was bad. - * 1 - Ack was good. - */ -static int -ipv6cp_ackci(f, p, len) - fsm *f; - u_char *p; - int len; -{ - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - u_short cilen, citype, cishort; - eui64_t ifaceid; - - /* - * 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) \ - if (neg) { \ - int vjlen = CILEN_COMPRESS; \ - 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; \ - } - -#define ACKCIIFACEID(opt, neg, val1) \ - if (neg) { \ - int idlen = CILEN_IFACEID; \ - if ((len -= idlen) < 0) \ - goto bad; \ - GETCHAR(citype, p); \ - GETCHAR(cilen, p); \ - if (cilen != idlen || \ - citype != opt) \ - goto bad; \ - eui64_get(ifaceid, p); \ - if (! eui64_equals(val1, ifaceid)) \ - goto bad; \ - } - - ACKCIIFACEID(CI_IFACEID, go->neg_ifaceid, go->ourid); - - ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol); - - /* - * If there are any remaining CIs, then this packet is bad. - */ - if (len != 0) - goto bad; - return (1); - -bad: - IPV6CPDEBUG(("ipv6cp_ackci: received bad Ack!")); - return (0); -} - -/* - * ipv6cp_nakci - Peer has sent a NAK for some of our CIs. - * This should not modify any state if the Nak is bad - * or if IPV6CP is in the OPENED state. - * - * Returns: - * 0 - Nak was bad. - * 1 - Nak was good. - */ -static int -ipv6cp_nakci(f, p, len) - fsm *f; - u_char *p; - int len; -{ - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - u_char citype, cilen, *next; - u_short cishort; - eui64_t ifaceid; - ipv6cp_options no; /* options we've seen Naks for */ - ipv6cp_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 NAKCIIFACEID(opt, neg, code) \ - if (go->neg && \ - len >= (cilen = CILEN_IFACEID) && \ - p[1] == cilen && \ - p[0] == opt) { \ - len -= cilen; \ - INCPTR(2, p); \ - eui64_get(ifaceid, p); \ - no.neg = 1; \ - code \ - } - -#define NAKCIVJ(opt, neg, code) \ - if (go->neg && \ - ((cilen = p[1]) == CILEN_COMPRESS) && \ - len >= cilen && \ - p[0] == opt) { \ - len -= cilen; \ - INCPTR(2, p); \ - GETSHORT(cishort, p); \ - no.neg = 1; \ - code \ - } - - /* - * Accept the peer's idea of {our,his} interface identifier, if different - * from our idea, only if the accept_{local,remote} flag is set. - */ - NAKCIIFACEID(CI_IFACEID, neg_ifaceid, - if (go->accept_local) { - while (eui64_iszero(ifaceid) || - eui64_equals(ifaceid, go->hisid)) /* bad luck */ - eui64_magic(ifaceid); - try.ourid = ifaceid; - IPV6CPDEBUG(("local LL address %s", llv6_ntoa(ifaceid))); - } - ); - -#ifdef IPV6CP_COMP - NAKCIVJ(CI_COMPRESSTYPE, neg_vj, - { - if (cishort == IPV6CP_COMP) { - try.vj_protocol = cishort; - } else { - try.neg_vj = 0; - } - } - ); -#else - NAKCIVJ(CI_COMPRESSTYPE, neg_vj, - { - try.neg_vj = 0; - } - ); -#endif - - /* - * 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 interface identifier, 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_COMPRESS)) - goto bad; - no.neg_vj = 1; - break; - case CI_IFACEID: - if (go->neg_ifaceid || no.neg_ifaceid || cilen != CILEN_IFACEID) - goto bad; - try.neg_ifaceid = 1; - eui64_get(ifaceid, p); - if (go->accept_local) { - while (eui64_iszero(ifaceid) || - eui64_equals(ifaceid, go->hisid)) /* bad luck */ - eui64_magic(ifaceid); - try.ourid = ifaceid; - } - no.neg_ifaceid = 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 != OPENED) - *go = try; - - return 1; - -bad: - IPV6CPDEBUG(("ipv6cp_nakci: received bad Nak!")); - return 0; -} - - -/* - * ipv6cp_rejci - Reject some of our CIs. - */ -static int -ipv6cp_rejci(f, p, len) - fsm *f; - u_char *p; - int len; -{ - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - u_char cilen; - u_short cishort; - eui64_t ifaceid; - ipv6cp_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 REJCIIFACEID(opt, neg, val1) \ - if (go->neg && \ - len >= (cilen = CILEN_IFACEID) && \ - p[1] == cilen && \ - p[0] == opt) { \ - len -= cilen; \ - INCPTR(2, p); \ - eui64_get(ifaceid, p); \ - /* Check rejected value. */ \ - if (! eui64_equals(ifaceid, val1)) \ - goto bad; \ - try.neg = 0; \ - } - -#define REJCIVJ(opt, neg, val) \ - if (go->neg && \ - p[1] == CILEN_COMPRESS && \ - len >= p[1] && \ - p[0] == opt) { \ - len -= p[1]; \ - INCPTR(2, p); \ - GETSHORT(cishort, p); \ - /* Check rejected value. */ \ - if (cishort != val) \ - goto bad; \ - try.neg = 0; \ - } - - REJCIIFACEID(CI_IFACEID, neg_ifaceid, go->ourid); - - REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol); - - /* - * If there are any remaining CIs, then this packet is bad. - */ - if (len != 0) - goto bad; - /* - * Now we can update state. - */ - if (f->state != OPENED) - *go = try; - return 1; - -bad: - IPV6CPDEBUG(("ipv6cp_rejci: received bad Reject!")); - return 0; -} - - -/* - * ipv6cp_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 -ipv6cp_reqci(f, inp, len, reject_if_disagree) - fsm *f; - u_char *inp; /* Requested CIs */ - int *len; /* Length of requested CIs */ - int reject_if_disagree; -{ - ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; - ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit]; - ipv6cp_options *ao = &ipv6cp_allowoptions[f->unit]; - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - u_char *cip, *next; /* Pointer to current and next CIs */ - u_short cilen, citype; /* Parsed len, type */ - u_short cishort; /* Parsed short value */ - eui64_t ifaceid; /* Parsed interface identifier */ - 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 */ - - /* - * 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? */ - IPV6CPDEBUG(("ipv6cp_reqci: bad CI length!")); - orc = CONFREJ; /* Reject bad CI */ - cilen = 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 */ - case CI_IFACEID: - IPV6CPDEBUG(("ipv6cp: received interface identifier ")); - - if (!ao->neg_ifaceid || - cilen != CILEN_IFACEID) { /* Check CI length */ - orc = CONFREJ; /* Reject CI */ - break; - } - - /* - * If he has no interface identifier, or if we both have same - * identifier then NAK it with new idea. - * In particular, if we don't know his identifier, but he does, - * then accept it. - */ - eui64_get(ifaceid, p); - IPV6CPDEBUG(("(%s)", llv6_ntoa(ifaceid))); - if (eui64_iszero(ifaceid) && eui64_iszero(go->ourid)) { - orc = CONFREJ; /* Reject CI */ - break; - } - if (!eui64_iszero(wo->hisid) && - !eui64_equals(ifaceid, wo->hisid) && - eui64_iszero(go->hisid)) { - - orc = CONFNAK; - ifaceid = wo->hisid; - go->hisid = ifaceid; - DECPTR(sizeof(ifaceid), p); - eui64_put(ifaceid, p); - } else - if (eui64_iszero(ifaceid) || eui64_equals(ifaceid, go->ourid)) { - orc = CONFNAK; - if (eui64_iszero(go->hisid)) /* first time, try option */ - ifaceid = wo->hisid; - while (eui64_iszero(ifaceid) || - eui64_equals(ifaceid, go->ourid)) /* bad luck */ - eui64_magic(ifaceid); - go->hisid = ifaceid; - DECPTR(sizeof(ifaceid), p); - eui64_put(ifaceid, p); - } - - ho->neg_ifaceid = 1; - ho->hisid = ifaceid; - break; - - case CI_COMPRESSTYPE: - IPV6CPDEBUG(("ipv6cp: received COMPRESSTYPE ")); - if (!ao->neg_vj || - (cilen != CILEN_COMPRESS)) { - orc = CONFREJ; - break; - } - GETSHORT(cishort, p); - IPV6CPDEBUG(("(%d)", cishort)); - -#ifdef IPV6CP_COMP - if (!(cishort == IPV6CP_COMP)) { - orc = CONFREJ; - break; - } - - ho->neg_vj = 1; - ho->vj_protocol = cishort; - break; -#else - orc = CONFREJ; - break; -#endif - - default: - orc = CONFREJ; - break; - } - -endswitch: - IPV6CPDEBUG((" (%s)\n", CODENAME(orc))); - - 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? */ - 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 identifier and they didn't send their identifier, then we - * send a NAK with a CI_IFACEID option appended. We assume the - * input buffer is long enough that we can append the extra - * option safely. - */ - if (rc != CONFREJ && !ho->neg_ifaceid && - wo->req_ifaceid && !reject_if_disagree) { - if (rc == CONFACK) { - rc = CONFNAK; - ucp = inp; /* reset pointer */ - wo->req_ifaceid = 0; /* don't ask again */ - } - PUTCHAR(CI_IFACEID, ucp); - PUTCHAR(CILEN_IFACEID, ucp); - eui64_put(wo->hisid, ucp); - } - - *len = ucp - inp; /* Compute output length */ - IPV6CPDEBUG(("ipv6cp: returning Configure-%s", CODENAME(rc))); - return (rc); /* Return final code */ -} - - -/* - * ipv6_check_options - check that any IP-related options are OK, - * and assign appropriate defaults. - */ -static void -ipv6_check_options() -{ - ipv6cp_options *wo = &ipv6cp_wantoptions[0]; - - if (!ipv6cp_protent.enabled_flag) - return; - -#if defined(SOL2) - /* - * Persistent link-local id is only used when user has not explicitly - * configure/hard-code the id - */ - if ((wo->use_persistent) && (!wo->opt_local) && (!wo->opt_remote)) { - - /* - * On systems where there are no Ethernet interfaces used, there - * may be other ways to obtain a persistent id. Right now, it - * will fall back to using magic [see eui64_magic] below when - * an EUI-48 from MAC address can't be obtained. Other possibilities - * include obtaining EEPROM serial numbers, or some other unique - * yet persistent number. On Sparc platforms, this is possible, - * but too bad there's no standards yet for x86 machines. - */ - if (ether_to_eui64(&wo->ourid)) { - wo->opt_local = 1; - } - } -#endif - - if (!wo->opt_local) { /* init interface identifier */ - if (wo->use_ip && eui64_iszero(wo->ourid)) { - eui64_setlo32(wo->ourid, ntohl(ipcp_wantoptions[0].ouraddr)); - if (!eui64_iszero(wo->ourid)) - wo->opt_local = 1; - } - - while (eui64_iszero(wo->ourid)) - eui64_magic(wo->ourid); - } - - if (!wo->opt_remote) { - if (wo->use_ip && eui64_iszero(wo->hisid)) { - eui64_setlo32(wo->hisid, ntohl(ipcp_wantoptions[0].hisaddr)); - if (!eui64_iszero(wo->hisid)) - wo->opt_remote = 1; - } - } - - if (demand && (eui64_iszero(wo->ourid) || eui64_iszero(wo->hisid))) { - option_error("local/remote LL address required for demand-dialling\n"); - exit(1); - } -} - - -/* - * ipv6_demand_conf - configure the interface as though - * IPV6CP were up, for use with dial-on-demand. - */ -static int -ipv6_demand_conf(u) - int u; -{ - ipv6cp_options *wo = &ipv6cp_wantoptions[u]; - -#if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__))) -#if defined(SOL2) - if (!sif6up(u)) - return 0; -#else - if (!sifup(u)) - return 0; -#endif /* defined(SOL2) */ -#endif - if (!sif6addr(u, wo->ourid, wo->hisid)) - return 0; -#if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) - if (!sifup(u)) - return 0; -#endif - if (!sifnpmode(u, PPP_IPV6, NPMODE_QUEUE)) - return 0; - - notice("ipv6_demand_conf"); - notice("local LL address %s", llv6_ntoa(wo->ourid)); - notice("remote LL address %s", llv6_ntoa(wo->hisid)); - - return 1; -} - - -/* - * ipv6cp_up - IPV6CP has come UP. - * - * Configure the IPv6 network interface appropriately and bring it up. - */ -static void -ipv6cp_up(f) - fsm *f; -{ - ipv6cp_options *ho = &ipv6cp_hisoptions[f->unit]; - ipv6cp_options *go = &ipv6cp_gotoptions[f->unit]; - ipv6cp_options *wo = &ipv6cp_wantoptions[f->unit]; - - IPV6CPDEBUG(("ipv6cp: up")); - - /* - * We must have a non-zero LL address for both ends of the link. - */ - if (!ho->neg_ifaceid) - ho->hisid = wo->hisid; - - if(!no_ifaceid_neg) { - if (eui64_iszero(ho->hisid)) { - error("Could not determine remote LL address"); - ipv6cp_close(f->unit, "Could not determine remote LL address"); - return; - } - if (eui64_iszero(go->ourid)) { - error("Could not determine local LL address"); - ipv6cp_close(f->unit, "Could not determine local LL address"); - return; - } - if (eui64_equals(go->ourid, ho->hisid)) { - error("local and remote LL addresses are equal"); - ipv6cp_close(f->unit, "local and remote LL addresses are equal"); - return; - } - } - script_setenv("LLLOCAL", llv6_ntoa(go->ourid), 0); - script_setenv("LLREMOTE", llv6_ntoa(ho->hisid), 0); - -#ifdef IPV6CP_COMP - /* set tcp compression */ - sif6comp(f->unit, ho->neg_vj); -#endif - - /* - * If we are doing dial-on-demand, the interface is already - * configured, so we put out any saved-up packets, then set the - * interface to pass IPv6 packets. - */ - if (demand) { - if (! eui64_equals(go->ourid, wo->ourid) || - ! eui64_equals(ho->hisid, wo->hisid)) { - if (! eui64_equals(go->ourid, wo->ourid)) - warn("Local LL address changed to %s", - llv6_ntoa(go->ourid)); - if (! eui64_equals(ho->hisid, wo->hisid)) - warn("Remote LL address changed to %s", - llv6_ntoa(ho->hisid)); - ipv6cp_clear_addrs(f->unit, go->ourid, ho->hisid); - - /* Set the interface to the new addresses */ - if (!sif6addr(f->unit, go->ourid, ho->hisid)) { - if (debug) - warn("sif6addr failed"); - ipv6cp_close(f->unit, "Interface configuration failed"); - return; - } - - } - demand_rexmit(PPP_IPV6); - sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS); - - } else { - /* - * Set LL addresses - */ -#if !defined(__linux__) && !defined(SOL2) && !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) - if (!sif6addr(f->unit, go->ourid, ho->hisid)) { - if (debug) - warn("sif6addr failed"); - ipv6cp_close(f->unit, "Interface configuration failed"); - return; - } -#endif - - /* bring the interface up for IPv6 */ -#if defined(SOL2) - if (!sif6up(f->unit)) { - if (debug) - warn("sifup failed (IPV6)"); - ipv6cp_close(f->unit, "Interface configuration failed"); - return; - } -#else - if (!sifup(f->unit)) { - if (debug) - warn("sifup failed (IPV6)"); - ipv6cp_close(f->unit, "Interface configuration failed"); - return; - } -#endif /* defined(SOL2) */ - -#if defined(__linux__) || defined(SOL2) || (defined(SVR4) && (defined(SNI) || defined(__USLC__))) - if (!sif6addr(f->unit, go->ourid, ho->hisid)) { - if (debug) - warn("sif6addr failed"); - ipv6cp_close(f->unit, "Interface configuration failed"); - return; - } -#endif - sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS); - - notice("local LL address %s", llv6_ntoa(go->ourid)); - notice("remote LL address %s", llv6_ntoa(ho->hisid)); - } - - np_up(f->unit, PPP_IPV6); - ipv6cp_is_up = 1; - - /* - * Execute the ipv6-up script, like this: - * /etc/ppp/ipv6-up interface tty speed local-LL remote-LL - */ - if (ipv6cp_script_state == s_down && ipv6cp_script_pid == 0) { - ipv6cp_script_state = s_up; - ipv6cp_script(_PATH_IPV6UP); - } -} - - -/* - * ipv6cp_down - IPV6CP has gone DOWN. - * - * Take the IPv6 network interface down, clear its addresses - * and delete routes through it. - */ -static void -ipv6cp_down(f) - fsm *f; -{ - IPV6CPDEBUG(("ipv6cp: down")); - update_link_stats(f->unit); - if (ipv6cp_is_up) { - ipv6cp_is_up = 0; - np_down(f->unit, PPP_IPV6); - } -#ifdef IPV6CP_COMP - sif6comp(f->unit, 0); -#endif - - /* - * If we are doing dial-on-demand, set the interface - * to queue up outgoing packets (for now). - */ - if (demand) { - sifnpmode(f->unit, PPP_IPV6, NPMODE_QUEUE); - } else { - sifnpmode(f->unit, PPP_IPV6, NPMODE_DROP); -#if !defined(__linux__) && !(defined(SVR4) && (defined(SNI) || defined(__USLC))) -#if defined(SOL2) - sif6down(f->unit); -#else - sifdown(f->unit); -#endif /* defined(SOL2) */ -#endif - ipv6cp_clear_addrs(f->unit, - ipv6cp_gotoptions[f->unit].ourid, - ipv6cp_hisoptions[f->unit].hisid); -#if defined(__linux__) || (defined(SVR4) && (defined(SNI) || defined(__USLC))) - sifdown(f->unit); -#endif - } - - /* Execute the ipv6-down script */ - if (ipv6cp_script_state == s_up && ipv6cp_script_pid == 0) { - ipv6cp_script_state = s_down; - ipv6cp_script(_PATH_IPV6DOWN); - } -} - - -/* - * ipv6cp_clear_addrs() - clear the interface addresses, routes, - * proxy neighbour discovery entries, etc. - */ -static void -ipv6cp_clear_addrs(unit, ourid, hisid) - int unit; - eui64_t ourid; - eui64_t hisid; -{ - cif6addr(unit, ourid, hisid); -} - - -/* - * ipv6cp_finished - possibly shut down the lower layers. - */ -static void -ipv6cp_finished(f) - fsm *f; -{ - np_finished(f->unit, PPP_IPV6); -} - - -/* - * ipv6cp_script_done - called when the ipv6-up or ipv6-down script - * has finished. - */ -static void -ipv6cp_script_done(arg) - void *arg; -{ - ipv6cp_script_pid = 0; - switch (ipv6cp_script_state) { - case s_up: - if (ipv6cp_fsm[0].state != OPENED) { - ipv6cp_script_state = s_down; - ipv6cp_script(_PATH_IPV6DOWN); - } - break; - case s_down: - if (ipv6cp_fsm[0].state == OPENED) { - ipv6cp_script_state = s_up; - ipv6cp_script(_PATH_IPV6UP); - } - break; - } -} - - -/* - * ipv6cp_script - Execute a script with arguments - * interface-name tty-name speed local-LL remote-LL. - */ -static void -ipv6cp_script(script) - char *script; -{ - char strspeed[32], strlocal[32], strremote[32]; - char *argv[8]; - - sprintf(strspeed, "%d", baud_rate); - strcpy(strlocal, llv6_ntoa(ipv6cp_gotoptions[0].ourid)); - strcpy(strremote, llv6_ntoa(ipv6cp_hisoptions[0].hisid)); - - argv[0] = script; - argv[1] = ifname; - argv[2] = devnam; - argv[3] = strspeed; - argv[4] = strlocal; - argv[5] = strremote; - argv[6] = ipparam; - argv[7] = NULL; - - ipv6cp_script_pid = run_program(script, argv, 0, ipv6cp_script_done, NULL); -} - -/* - * ipv6cp_printpkt - print the contents of an IPV6CP packet. - */ -static char *ipv6cp_codenames[] = { - "ConfReq", "ConfAck", "ConfNak", "ConfRej", - "TermReq", "TermAck", "CodeRej" -}; - -static int -ipv6cp_printpkt(p, plen, printer, arg) - u_char *p; - int plen; - void (*printer) __P((void *, char *, ...)); - void *arg; -{ - int code, id, len, olen; - u_char *pstart, *optend; - u_short cishort; - eui64_t ifaceid; - - if (plen < HEADERLEN) - return 0; - pstart = p; - GETCHAR(code, p); - GETCHAR(id, p); - GETSHORT(len, p); - if (len < HEADERLEN || len > plen) - return 0; - - if (code >= 1 && code <= sizeof(ipv6cp_codenames) / sizeof(char *)) - printer(arg, " %s", ipv6cp_codenames[code-1]); - else - printer(arg, " code=0x%x", code); - printer(arg, " id=0x%x", id); - len -= HEADERLEN; - switch (code) { - case CONFREQ: - case CONFACK: - case CONFNAK: - case CONFREJ: - /* print option list */ - while (len >= 2) { - GETCHAR(code, p); - GETCHAR(olen, p); - p -= 2; - if (olen < 2 || olen > len) { - break; - } - printer(arg, " <"); - len -= olen; - optend = p + olen; - switch (code) { - case CI_COMPRESSTYPE: - if (olen >= CILEN_COMPRESS) { - p += 2; - GETSHORT(cishort, p); - printer(arg, "compress "); - printer(arg, "0x%x", cishort); - } - break; - case CI_IFACEID: - if (olen == CILEN_IFACEID) { - p += 2; - eui64_get(ifaceid, p); - printer(arg, "addr %s", llv6_ntoa(ifaceid)); - } - break; - } - while (p < optend) { - GETCHAR(code, p); - printer(arg, " %.2x", code); - } - printer(arg, ">"); - } - break; - - case TERMACK: - case TERMREQ: - if (len > 0 && *p >= ' ' && *p < 0x7f) { - printer(arg, " "); - print_string((char *)p, len, printer, arg); - p += len; - len = 0; - } - break; - } - - /* print the rest of the bytes in the packet */ - for (; len > 0; --len) { - GETCHAR(code, p); - printer(arg, " %.2x", code); - } - - return p - pstart; -} - -/* - * ipv6_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 IP6_HDRLEN 40 /* bytes */ -#define IP6_NHDR_FRAG 44 /* fragment IPv6 header */ -#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 get_ip6nh(x) (((unsigned char *)(x))[6]) -#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) -#define get_tcpflags(x) (((unsigned char *)(x))[13]) - -static int -ipv6_active_pkt(pkt, len) - u_char *pkt; - int len; -{ - u_char *tcp; - - len -= PPP_HDRLEN; - pkt += PPP_HDRLEN; - if (len < IP6_HDRLEN) - return 0; - if (get_ip6nh(pkt) == IP6_NHDR_FRAG) - return 0; - if (get_ip6nh(pkt) != IPPROTO_TCP) - return 1; - if (len < IP6_HDRLEN + TCP_HDRLEN) - return 0; - tcp = pkt + IP6_HDRLEN; - if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == IP6_HDRLEN + get_tcpoff(tcp) * 4) - return 0; - return 1; -} |