[164] | 1 | /** In contrast to pppd 2.3.1, DNS support has been added, proxy-ARP and
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| 2 | dial-on-demand has been stripped. */
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| 3 | /*****************************************************************************
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| 4 | * ipcp.c - Network PPP IP Control Protocol program file.
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| 5 | *
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| 6 | * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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| 7 | * portions Copyright (c) 1997 by Global Election Systems Inc.
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| 8 | *
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| 9 | * The authors hereby grant permission to use, copy, modify, distribute,
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| 10 | * and license this software and its documentation for any purpose, provided
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| 11 | * that existing copyright notices are retained in all copies and that this
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| 12 | * notice and the following disclaimer are included verbatim in any
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| 13 | * distributions. No written agreement, license, or royalty fee is required
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| 14 | * for any of the authorized uses.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 19 | * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 26 | *
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| 27 | ******************************************************************************
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| 28 | * REVISION HISTORY
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| 29 | *
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| 30 | * 03-01-01 Marc Boucher <marc@mbsi.ca>
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| 31 | * Ported to lwIP.
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| 32 | * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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| 33 | * Original.
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| 34 | *****************************************************************************/
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| 35 | /*
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| 36 | * ipcp.c - PPP IP Control Protocol.
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| 37 | *
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| 38 | * Copyright (c) 1989 Carnegie Mellon University.
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| 39 | * All rights reserved.
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| 40 | *
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| 41 | * Redistribution and use in source and binary forms are permitted
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| 42 | * provided that the above copyright notice and this paragraph are
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| 43 | * duplicated in all such forms and that any documentation,
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| 44 | * advertising materials, and other materials related to such
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| 45 | * distribution and use acknowledge that the software was developed
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| 46 | * by Carnegie Mellon University. The name of the
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| 47 | * University may not be used to endorse or promote products derived
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| 48 | * from this software without specific prior written permission.
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| 49 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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| 50 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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| 51 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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| 52 | */
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| 53 |
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| 54 | #include "lwip/opt.h"
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| 55 |
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| 56 | #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 57 |
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| 58 | #include "ppp_impl.h"
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| 59 | #include "pppdebug.h"
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| 60 |
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| 61 | #include "auth.h"
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| 62 | #include "fsm.h"
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| 63 | #include "vj.h"
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| 64 | #include "ipcp.h"
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| 65 |
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| 66 | #include "lwip/inet.h"
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| 67 |
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| 68 | #include <string.h>
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| 69 |
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| 70 | /* #define OLD_CI_ADDRS 1 */ /* Support deprecated address negotiation. */
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| 71 |
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| 72 | /* global vars */
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| 73 | ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
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| 74 | ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
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| 75 | ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
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| 76 | ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
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| 77 |
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| 78 | /* local vars */
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| 79 | static int default_route_set[NUM_PPP]; /* Have set up a default route */
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| 80 | static int cis_received[NUM_PPP]; /* # Conf-Reqs received */
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| 81 |
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| 82 |
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| 83 | /*
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| 84 | * Callbacks for fsm code. (CI = Configuration Information)
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| 85 | */
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| 86 | static void ipcp_resetci (fsm *); /* Reset our CI */
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| 87 | static int ipcp_cilen (fsm *); /* Return length of our CI */
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| 88 | static void ipcp_addci (fsm *, u_char *, int *); /* Add our CI */
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| 89 | static int ipcp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
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| 90 | static int ipcp_nakci (fsm *, u_char *, int); /* Peer nak'd our CI */
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| 91 | static int ipcp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
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| 92 | static int ipcp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
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| 93 | static void ipcp_up (fsm *); /* We're UP */
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| 94 | static void ipcp_down (fsm *); /* We're DOWN */
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| 95 | #if PPP_ADDITIONAL_CALLBACKS
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| 96 | static void ipcp_script (fsm *, char *); /* Run an up/down script */
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| 97 | #endif
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| 98 | static void ipcp_finished (fsm *); /* Don't need lower layer */
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| 99 |
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| 100 |
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| 101 | fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
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| 102 |
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| 103 |
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| 104 | static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
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| 105 | ipcp_resetci, /* Reset our Configuration Information */
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| 106 | ipcp_cilen, /* Length of our Configuration Information */
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| 107 | ipcp_addci, /* Add our Configuration Information */
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| 108 | ipcp_ackci, /* ACK our Configuration Information */
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| 109 | ipcp_nakci, /* NAK our Configuration Information */
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| 110 | ipcp_rejci, /* Reject our Configuration Information */
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| 111 | ipcp_reqci, /* Request peer's Configuration Information */
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| 112 | ipcp_up, /* Called when fsm reaches LS_OPENED state */
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| 113 | ipcp_down, /* Called when fsm leaves LS_OPENED state */
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| 114 | NULL, /* Called when we want the lower layer up */
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| 115 | ipcp_finished, /* Called when we want the lower layer down */
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| 116 | NULL, /* Called when Protocol-Reject received */
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| 117 | NULL, /* Retransmission is necessary */
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| 118 | NULL, /* Called to handle protocol-specific codes */
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| 119 | "IPCP" /* String name of protocol */
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| 120 | };
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| 121 |
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| 122 | /*
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| 123 | * Protocol entry points from main code.
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| 124 | */
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| 125 | static void ipcp_init (int);
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| 126 | static void ipcp_open (int);
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| 127 | static void ipcp_close (int, char *);
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| 128 | static void ipcp_lowerup (int);
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| 129 | static void ipcp_lowerdown (int);
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| 130 | static void ipcp_input (int, u_char *, int);
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| 131 | static void ipcp_protrej (int);
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| 132 |
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| 133 |
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| 134 | struct protent ipcp_protent = {
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| 135 | PPP_IPCP,
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| 136 | ipcp_init,
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| 137 | ipcp_input,
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| 138 | ipcp_protrej,
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| 139 | ipcp_lowerup,
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| 140 | ipcp_lowerdown,
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| 141 | ipcp_open,
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| 142 | ipcp_close,
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| 143 | #if PPP_ADDITIONAL_CALLBACKS
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| 144 | ipcp_printpkt,
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| 145 | NULL,
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| 146 | #endif /* PPP_ADDITIONAL_CALLBACKS */
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| 147 | 1,
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| 148 | "IPCP",
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| 149 | #if PPP_ADDITIONAL_CALLBACKS
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| 150 | ip_check_options,
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| 151 | NULL,
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| 152 | ip_active_pkt
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| 153 | #endif /* PPP_ADDITIONAL_CALLBACKS */
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| 154 | };
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| 155 |
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| 156 | static void ipcp_clear_addrs (int);
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| 157 |
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| 158 | /*
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| 159 | * Lengths of configuration options.
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| 160 | */
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| 161 | #define CILEN_VOID 2
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| 162 | #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
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| 163 | #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
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| 164 | #define CILEN_ADDR 6 /* new-style single address option */
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| 165 | #define CILEN_ADDRS 10 /* old-style dual address option */
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| 166 |
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| 167 |
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| 168 | #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
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| 169 | (x) == CONFNAK ? "NAK" : "REJ")
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| 170 |
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| 171 |
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| 172 | /*
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| 173 | * ipcp_init - Initialize IPCP.
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| 174 | */
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| 175 | static void
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| 176 | ipcp_init(int unit)
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| 177 | {
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| 178 | fsm *f = &ipcp_fsm[unit];
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| 179 | ipcp_options *wo = &ipcp_wantoptions[unit];
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| 180 | ipcp_options *ao = &ipcp_allowoptions[unit];
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| 181 |
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| 182 | f->unit = unit;
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| 183 | f->protocol = PPP_IPCP;
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| 184 | f->callbacks = &ipcp_callbacks;
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| 185 | fsm_init(&ipcp_fsm[unit]);
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| 186 |
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| 187 | memset(wo, 0, sizeof(*wo));
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| 188 | memset(ao, 0, sizeof(*ao));
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| 189 |
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| 190 | wo->neg_addr = 1;
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| 191 | wo->ouraddr = 0;
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| 192 | #if VJ_SUPPORT
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| 193 | wo->neg_vj = 1;
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| 194 | #else /* VJ_SUPPORT */
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| 195 | wo->neg_vj = 0;
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| 196 | #endif /* VJ_SUPPORT */
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| 197 | wo->vj_protocol = IPCP_VJ_COMP;
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| 198 | wo->maxslotindex = MAX_SLOTS - 1;
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| 199 | wo->cflag = 0;
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| 200 | wo->default_route = 1;
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| 201 |
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| 202 | ao->neg_addr = 1;
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| 203 | #if VJ_SUPPORT
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| 204 | ao->neg_vj = 1;
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| 205 | #else /* VJ_SUPPORT */
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| 206 | ao->neg_vj = 0;
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| 207 | #endif /* VJ_SUPPORT */
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| 208 | ao->maxslotindex = MAX_SLOTS - 1;
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| 209 | ao->cflag = 1;
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| 210 | ao->default_route = 1;
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| 211 | }
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| 212 |
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| 213 |
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| 214 | /*
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| 215 | * ipcp_open - IPCP is allowed to come up.
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| 216 | */
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| 217 | static void
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| 218 | ipcp_open(int unit)
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| 219 | {
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| 220 | fsm_open(&ipcp_fsm[unit]);
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| 221 | }
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| 222 |
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| 223 |
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| 224 | /*
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| 225 | * ipcp_close - Take IPCP down.
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| 226 | */
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| 227 | static void
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| 228 | ipcp_close(int unit, char *reason)
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| 229 | {
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| 230 | fsm_close(&ipcp_fsm[unit], reason);
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| 231 | }
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| 232 |
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| 233 |
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| 234 | /*
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| 235 | * ipcp_lowerup - The lower layer is up.
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| 236 | */
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| 237 | static void
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| 238 | ipcp_lowerup(int unit)
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| 239 | {
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| 240 | fsm_lowerup(&ipcp_fsm[unit]);
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| 241 | }
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| 242 |
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| 243 |
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| 244 | /*
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| 245 | * ipcp_lowerdown - The lower layer is down.
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| 246 | */
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| 247 | static void
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| 248 | ipcp_lowerdown(int unit)
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| 249 | {
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| 250 | fsm_lowerdown(&ipcp_fsm[unit]);
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| 251 | }
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| 252 |
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| 253 |
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| 254 | /*
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| 255 | * ipcp_input - Input IPCP packet.
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| 256 | */
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| 257 | static void
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| 258 | ipcp_input(int unit, u_char *p, int len)
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| 259 | {
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| 260 | fsm_input(&ipcp_fsm[unit], p, len);
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| 261 | }
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| 262 |
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| 263 |
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| 264 | /*
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| 265 | * ipcp_protrej - A Protocol-Reject was received for IPCP.
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| 266 | *
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| 267 | * Pretend the lower layer went down, so we shut up.
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| 268 | */
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| 269 | static void
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| 270 | ipcp_protrej(int unit)
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| 271 | {
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| 272 | fsm_lowerdown(&ipcp_fsm[unit]);
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| 273 | }
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| 274 |
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| 275 |
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| 276 | /*
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| 277 | * ipcp_resetci - Reset our CI.
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| 278 | */
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| 279 | static void
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| 280 | ipcp_resetci(fsm *f)
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| 281 | {
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| 282 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
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| 283 |
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| 284 | wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
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| 285 | if (wo->ouraddr == 0) {
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| 286 | wo->accept_local = 1;
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| 287 | }
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| 288 | if (wo->hisaddr == 0) {
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| 289 | wo->accept_remote = 1;
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| 290 | }
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| 291 | /* Request DNS addresses from the peer */
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| 292 | wo->req_dns1 = ppp_settings.usepeerdns;
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| 293 | wo->req_dns2 = ppp_settings.usepeerdns;
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| 294 | ipcp_gotoptions[f->unit] = *wo;
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| 295 | cis_received[f->unit] = 0;
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| 296 | }
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| 297 |
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| 298 |
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| 299 | /*
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| 300 | * ipcp_cilen - Return length of our CI.
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| 301 | */
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| 302 | static int
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| 303 | ipcp_cilen(fsm *f)
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| 304 | {
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| 305 | ipcp_options *go = &ipcp_gotoptions[f->unit];
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| 306 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
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| 307 | ipcp_options *ho = &ipcp_hisoptions[f->unit];
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| 308 |
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| 309 | #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
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| 310 | #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
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| 311 | #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
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| 312 |
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| 313 | /*
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| 314 | * First see if we want to change our options to the old
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| 315 | * forms because we have received old forms from the peer.
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| 316 | */
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| 317 | if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
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| 318 | /* use the old style of address negotiation */
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| 319 | go->neg_addr = 1;
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| 320 | go->old_addrs = 1;
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| 321 | }
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| 322 | if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
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| 323 | /* try an older style of VJ negotiation */
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| 324 | if (cis_received[f->unit] == 0) {
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| 325 | /* keep trying the new style until we see some CI from the peer */
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| 326 | go->neg_vj = 1;
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| 327 | } else {
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| 328 | /* use the old style only if the peer did */
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| 329 | if (ho->neg_vj && ho->old_vj) {
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| 330 | go->neg_vj = 1;
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| 331 | go->old_vj = 1;
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| 332 | go->vj_protocol = ho->vj_protocol;
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| 333 | }
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| 334 | }
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| 335 | }
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| 336 |
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| 337 | return (LENCIADDR(go->neg_addr, go->old_addrs) +
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| 338 | LENCIVJ(go->neg_vj, go->old_vj) +
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| 339 | LENCIDNS(go->req_dns1) +
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| 340 | LENCIDNS(go->req_dns2));
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| 341 | }
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| 342 |
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| 343 |
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| 344 | /*
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| 345 | * ipcp_addci - Add our desired CIs to a packet.
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| 346 | */
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| 347 | static void
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| 348 | ipcp_addci(fsm *f, u_char *ucp, int *lenp)
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| 349 | {
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| 350 | ipcp_options *go = &ipcp_gotoptions[f->unit];
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| 351 | int len = *lenp;
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| 352 |
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| 353 | #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
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| 354 | if (neg) { \
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| 355 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
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| 356 | if (len >= vjlen) { \
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| 357 | PUTCHAR(opt, ucp); \
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| 358 | PUTCHAR(vjlen, ucp); \
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| 359 | PUTSHORT(val, ucp); \
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| 360 | if (!old) { \
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| 361 | PUTCHAR(maxslotindex, ucp); \
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| 362 | PUTCHAR(cflag, ucp); \
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| 363 | } \
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| 364 | len -= vjlen; \
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| 365 | } else { \
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| 366 | neg = 0; \
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| 367 | } \
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| 368 | }
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| 369 |
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| 370 | #define ADDCIADDR(opt, neg, old, val1, val2) \
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| 371 | if (neg) { \
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| 372 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
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| 373 | if (len >= addrlen) { \
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| 374 | u32_t l; \
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| 375 | PUTCHAR(opt, ucp); \
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| 376 | PUTCHAR(addrlen, ucp); \
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| 377 | l = ntohl(val1); \
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| 378 | PUTLONG(l, ucp); \
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| 379 | if (old) { \
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| 380 | l = ntohl(val2); \
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| 381 | PUTLONG(l, ucp); \
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| 382 | } \
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| 383 | len -= addrlen; \
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| 384 | } else { \
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| 385 | neg = 0; \
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| 386 | } \
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| 387 | }
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| 388 |
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| 389 | #define ADDCIDNS(opt, neg, addr) \
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| 390 | if (neg) { \
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| 391 | if (len >= CILEN_ADDR) { \
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| 392 | u32_t l; \
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| 393 | PUTCHAR(opt, ucp); \
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| 394 | PUTCHAR(CILEN_ADDR, ucp); \
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| 395 | l = ntohl(addr); \
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| 396 | PUTLONG(l, ucp); \
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| 397 | len -= CILEN_ADDR; \
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| 398 | } else { \
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| 399 | neg = 0; \
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| 400 | } \
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| 401 | }
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| 402 |
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| 403 | ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
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| 404 | go->old_addrs, go->ouraddr, go->hisaddr);
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| 405 |
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| 406 | ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
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| 407 | go->maxslotindex, go->cflag);
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| 408 |
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| 409 | ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
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| 410 |
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| 411 | ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
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| 412 |
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| 413 | *lenp -= len;
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| 414 | }
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| 415 |
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| 416 |
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| 417 | /*
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| 418 | * ipcp_ackci - Ack our CIs.
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| 419 | *
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| 420 | * Returns:
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| 421 | * 0 - Ack was bad.
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| 422 | * 1 - Ack was good.
|
---|
| 423 | */
|
---|
| 424 | static int
|
---|
| 425 | ipcp_ackci(fsm *f, u_char *p, int len)
|
---|
| 426 | {
|
---|
| 427 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
| 428 | u_short cilen, citype, cishort;
|
---|
| 429 | u32_t cilong;
|
---|
| 430 | u_char cimaxslotindex, cicflag;
|
---|
| 431 |
|
---|
| 432 | /*
|
---|
| 433 | * CIs must be in exactly the same order that we sent...
|
---|
| 434 | * Check packet length and CI length at each step.
|
---|
| 435 | * If we find any deviations, then this packet is bad.
|
---|
| 436 | */
|
---|
| 437 |
|
---|
| 438 | #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
|
---|
| 439 | if (neg) { \
|
---|
| 440 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
|
---|
| 441 | if ((len -= vjlen) < 0) { \
|
---|
| 442 | goto bad; \
|
---|
| 443 | } \
|
---|
| 444 | GETCHAR(citype, p); \
|
---|
| 445 | GETCHAR(cilen, p); \
|
---|
| 446 | if (cilen != vjlen || \
|
---|
| 447 | citype != opt) { \
|
---|
| 448 | goto bad; \
|
---|
| 449 | } \
|
---|
| 450 | GETSHORT(cishort, p); \
|
---|
| 451 | if (cishort != val) { \
|
---|
| 452 | goto bad; \
|
---|
| 453 | } \
|
---|
| 454 | if (!old) { \
|
---|
| 455 | GETCHAR(cimaxslotindex, p); \
|
---|
| 456 | if (cimaxslotindex != maxslotindex) { \
|
---|
| 457 | goto bad; \
|
---|
| 458 | } \
|
---|
| 459 | GETCHAR(cicflag, p); \
|
---|
| 460 | if (cicflag != cflag) { \
|
---|
| 461 | goto bad; \
|
---|
| 462 | } \
|
---|
| 463 | } \
|
---|
| 464 | }
|
---|
| 465 |
|
---|
| 466 | #define ACKCIADDR(opt, neg, old, val1, val2) \
|
---|
| 467 | if (neg) { \
|
---|
| 468 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
|
---|
| 469 | u32_t l; \
|
---|
| 470 | if ((len -= addrlen) < 0) { \
|
---|
| 471 | goto bad; \
|
---|
| 472 | } \
|
---|
| 473 | GETCHAR(citype, p); \
|
---|
| 474 | GETCHAR(cilen, p); \
|
---|
| 475 | if (cilen != addrlen || \
|
---|
| 476 | citype != opt) { \
|
---|
| 477 | goto bad; \
|
---|
| 478 | } \
|
---|
| 479 | GETLONG(l, p); \
|
---|
| 480 | cilong = htonl(l); \
|
---|
| 481 | if (val1 != cilong) { \
|
---|
| 482 | goto bad; \
|
---|
| 483 | } \
|
---|
| 484 | if (old) { \
|
---|
| 485 | GETLONG(l, p); \
|
---|
| 486 | cilong = htonl(l); \
|
---|
| 487 | if (val2 != cilong) { \
|
---|
| 488 | goto bad; \
|
---|
| 489 | } \
|
---|
| 490 | } \
|
---|
| 491 | }
|
---|
| 492 |
|
---|
| 493 | #define ACKCIDNS(opt, neg, addr) \
|
---|
| 494 | if (neg) { \
|
---|
| 495 | u32_t l; \
|
---|
| 496 | if ((len -= CILEN_ADDR) < 0) { \
|
---|
| 497 | goto bad; \
|
---|
| 498 | } \
|
---|
| 499 | GETCHAR(citype, p); \
|
---|
| 500 | GETCHAR(cilen, p); \
|
---|
| 501 | if (cilen != CILEN_ADDR || \
|
---|
| 502 | citype != opt) { \
|
---|
| 503 | goto bad; \
|
---|
| 504 | } \
|
---|
| 505 | GETLONG(l, p); \
|
---|
| 506 | cilong = htonl(l); \
|
---|
| 507 | if (addr != cilong) { \
|
---|
| 508 | goto bad; \
|
---|
| 509 | } \
|
---|
| 510 | }
|
---|
| 511 |
|
---|
| 512 | ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
|
---|
| 513 | go->old_addrs, go->ouraddr, go->hisaddr);
|
---|
| 514 |
|
---|
| 515 | ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
|
---|
| 516 | go->maxslotindex, go->cflag);
|
---|
| 517 |
|
---|
| 518 | ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
|
---|
| 519 |
|
---|
| 520 | ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
|
---|
| 521 |
|
---|
| 522 | /*
|
---|
| 523 | * If there are any remaining CIs, then this packet is bad.
|
---|
| 524 | */
|
---|
| 525 | if (len != 0) {
|
---|
| 526 | goto bad;
|
---|
| 527 | }
|
---|
| 528 | return (1);
|
---|
| 529 |
|
---|
| 530 | bad:
|
---|
| 531 | IPCPDEBUG(LOG_INFO, ("ipcp_ackci: received bad Ack!\n"));
|
---|
| 532 | return (0);
|
---|
| 533 | }
|
---|
| 534 |
|
---|
| 535 | /*
|
---|
| 536 | * ipcp_nakci - Peer has sent a NAK for some of our CIs.
|
---|
| 537 | * This should not modify any state if the Nak is bad
|
---|
| 538 | * or if IPCP is in the LS_OPENED state.
|
---|
| 539 | *
|
---|
| 540 | * Returns:
|
---|
| 541 | * 0 - Nak was bad.
|
---|
| 542 | * 1 - Nak was good.
|
---|
| 543 | */
|
---|
| 544 | static int
|
---|
| 545 | ipcp_nakci(fsm *f, u_char *p, int len)
|
---|
| 546 | {
|
---|
| 547 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
| 548 | u_char cimaxslotindex, cicflag;
|
---|
| 549 | u_char citype, cilen, *next;
|
---|
| 550 | u_short cishort;
|
---|
| 551 | u32_t ciaddr1, ciaddr2, l, cidnsaddr;
|
---|
| 552 | ipcp_options no; /* options we've seen Naks for */
|
---|
| 553 | ipcp_options try; /* options to request next time */
|
---|
| 554 |
|
---|
| 555 | BZERO(&no, sizeof(no));
|
---|
| 556 | try = *go;
|
---|
| 557 |
|
---|
| 558 | /*
|
---|
| 559 | * Any Nak'd CIs must be in exactly the same order that we sent.
|
---|
| 560 | * Check packet length and CI length at each step.
|
---|
| 561 | * If we find any deviations, then this packet is bad.
|
---|
| 562 | */
|
---|
| 563 | #define NAKCIADDR(opt, neg, old, code) \
|
---|
| 564 | if (go->neg && \
|
---|
| 565 | len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
|
---|
| 566 | p[1] == cilen && \
|
---|
| 567 | p[0] == opt) { \
|
---|
| 568 | len -= cilen; \
|
---|
| 569 | INCPTR(2, p); \
|
---|
| 570 | GETLONG(l, p); \
|
---|
| 571 | ciaddr1 = htonl(l); \
|
---|
| 572 | if (old) { \
|
---|
| 573 | GETLONG(l, p); \
|
---|
| 574 | ciaddr2 = htonl(l); \
|
---|
| 575 | no.old_addrs = 1; \
|
---|
| 576 | } else { \
|
---|
| 577 | ciaddr2 = 0; \
|
---|
| 578 | } \
|
---|
| 579 | no.neg = 1; \
|
---|
| 580 | code \
|
---|
| 581 | }
|
---|
| 582 |
|
---|
| 583 | #define NAKCIVJ(opt, neg, code) \
|
---|
| 584 | if (go->neg && \
|
---|
| 585 | ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
|
---|
| 586 | len >= cilen && \
|
---|
| 587 | p[0] == opt) { \
|
---|
| 588 | len -= cilen; \
|
---|
| 589 | INCPTR(2, p); \
|
---|
| 590 | GETSHORT(cishort, p); \
|
---|
| 591 | no.neg = 1; \
|
---|
| 592 | code \
|
---|
| 593 | }
|
---|
| 594 |
|
---|
| 595 | #define NAKCIDNS(opt, neg, code) \
|
---|
| 596 | if (go->neg && \
|
---|
| 597 | ((cilen = p[1]) == CILEN_ADDR) && \
|
---|
| 598 | len >= cilen && \
|
---|
| 599 | p[0] == opt) { \
|
---|
| 600 | len -= cilen; \
|
---|
| 601 | INCPTR(2, p); \
|
---|
| 602 | GETLONG(l, p); \
|
---|
| 603 | cidnsaddr = htonl(l); \
|
---|
| 604 | no.neg = 1; \
|
---|
| 605 | code \
|
---|
| 606 | }
|
---|
| 607 |
|
---|
| 608 | /*
|
---|
| 609 | * Accept the peer's idea of {our,his} address, if different
|
---|
| 610 | * from our idea, only if the accept_{local,remote} flag is set.
|
---|
| 611 | */
|
---|
| 612 | NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
|
---|
| 613 | if (go->accept_local && ciaddr1) { /* Do we know our address? */
|
---|
| 614 | try.ouraddr = ciaddr1;
|
---|
| 615 | IPCPDEBUG(LOG_INFO, ("local IP address %s\n",
|
---|
| 616 | inet_ntoa(ciaddr1)));
|
---|
| 617 | }
|
---|
| 618 | if (go->accept_remote && ciaddr2) { /* Does he know his? */
|
---|
| 619 | try.hisaddr = ciaddr2;
|
---|
| 620 | IPCPDEBUG(LOG_INFO, ("remote IP address %s\n",
|
---|
| 621 | inet_ntoa(ciaddr2)));
|
---|
| 622 | }
|
---|
| 623 | );
|
---|
| 624 |
|
---|
| 625 | /*
|
---|
| 626 | * Accept the peer's value of maxslotindex provided that it
|
---|
| 627 | * is less than what we asked for. Turn off slot-ID compression
|
---|
| 628 | * if the peer wants. Send old-style compress-type option if
|
---|
| 629 | * the peer wants.
|
---|
| 630 | */
|
---|
| 631 | NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
|
---|
| 632 | if (cilen == CILEN_VJ) {
|
---|
| 633 | GETCHAR(cimaxslotindex, p);
|
---|
| 634 | GETCHAR(cicflag, p);
|
---|
| 635 | if (cishort == IPCP_VJ_COMP) {
|
---|
| 636 | try.old_vj = 0;
|
---|
| 637 | if (cimaxslotindex < go->maxslotindex) {
|
---|
| 638 | try.maxslotindex = cimaxslotindex;
|
---|
| 639 | }
|
---|
| 640 | if (!cicflag) {
|
---|
| 641 | try.cflag = 0;
|
---|
| 642 | }
|
---|
| 643 | } else {
|
---|
| 644 | try.neg_vj = 0;
|
---|
| 645 | }
|
---|
| 646 | } else {
|
---|
| 647 | if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
|
---|
| 648 | try.old_vj = 1;
|
---|
| 649 | try.vj_protocol = cishort;
|
---|
| 650 | } else {
|
---|
| 651 | try.neg_vj = 0;
|
---|
| 652 | }
|
---|
| 653 | }
|
---|
| 654 | );
|
---|
| 655 |
|
---|
| 656 | NAKCIDNS(CI_MS_DNS1, req_dns1,
|
---|
| 657 | try.dnsaddr[0] = cidnsaddr;
|
---|
| 658 | IPCPDEBUG(LOG_INFO, ("primary DNS address %s\n", inet_ntoa(cidnsaddr)));
|
---|
| 659 | );
|
---|
| 660 |
|
---|
| 661 | NAKCIDNS(CI_MS_DNS2, req_dns2,
|
---|
| 662 | try.dnsaddr[1] = cidnsaddr;
|
---|
| 663 | IPCPDEBUG(LOG_INFO, ("secondary DNS address %s\n", inet_ntoa(cidnsaddr)));
|
---|
| 664 | );
|
---|
| 665 |
|
---|
| 666 | /*
|
---|
| 667 | * There may be remaining CIs, if the peer is requesting negotiation
|
---|
| 668 | * on an option that we didn't include in our request packet.
|
---|
| 669 | * If they want to negotiate about IP addresses, we comply.
|
---|
| 670 | * If they want us to ask for compression, we refuse.
|
---|
| 671 | */
|
---|
| 672 | while (len > CILEN_VOID) {
|
---|
| 673 | GETCHAR(citype, p);
|
---|
| 674 | GETCHAR(cilen, p);
|
---|
| 675 | if( (len -= cilen) < 0 ) {
|
---|
| 676 | goto bad;
|
---|
| 677 | }
|
---|
| 678 | next = p + cilen - 2;
|
---|
| 679 |
|
---|
| 680 | switch (citype) {
|
---|
| 681 | case CI_COMPRESSTYPE:
|
---|
| 682 | if (go->neg_vj || no.neg_vj ||
|
---|
| 683 | (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
|
---|
| 684 | goto bad;
|
---|
| 685 | }
|
---|
| 686 | no.neg_vj = 1;
|
---|
| 687 | break;
|
---|
| 688 | case CI_ADDRS:
|
---|
| 689 | if ((go->neg_addr && go->old_addrs) || no.old_addrs
|
---|
| 690 | || cilen != CILEN_ADDRS) {
|
---|
| 691 | goto bad;
|
---|
| 692 | }
|
---|
| 693 | try.neg_addr = 1;
|
---|
| 694 | try.old_addrs = 1;
|
---|
| 695 | GETLONG(l, p);
|
---|
| 696 | ciaddr1 = htonl(l);
|
---|
| 697 | if (ciaddr1 && go->accept_local) {
|
---|
| 698 | try.ouraddr = ciaddr1;
|
---|
| 699 | }
|
---|
| 700 | GETLONG(l, p);
|
---|
| 701 | ciaddr2 = htonl(l);
|
---|
| 702 | if (ciaddr2 && go->accept_remote) {
|
---|
| 703 | try.hisaddr = ciaddr2;
|
---|
| 704 | }
|
---|
| 705 | no.old_addrs = 1;
|
---|
| 706 | break;
|
---|
| 707 | case CI_ADDR:
|
---|
| 708 | if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) {
|
---|
| 709 | goto bad;
|
---|
| 710 | }
|
---|
| 711 | try.old_addrs = 0;
|
---|
| 712 | GETLONG(l, p);
|
---|
| 713 | ciaddr1 = htonl(l);
|
---|
| 714 | if (ciaddr1 && go->accept_local) {
|
---|
| 715 | try.ouraddr = ciaddr1;
|
---|
| 716 | }
|
---|
| 717 | if (try.ouraddr != 0) {
|
---|
| 718 | try.neg_addr = 1;
|
---|
| 719 | }
|
---|
| 720 | no.neg_addr = 1;
|
---|
| 721 | break;
|
---|
| 722 | }
|
---|
| 723 | p = next;
|
---|
| 724 | }
|
---|
| 725 |
|
---|
| 726 | /* If there is still anything left, this packet is bad. */
|
---|
| 727 | if (len != 0) {
|
---|
| 728 | goto bad;
|
---|
| 729 | }
|
---|
| 730 |
|
---|
| 731 | /*
|
---|
| 732 | * OK, the Nak is good. Now we can update state.
|
---|
| 733 | */
|
---|
| 734 | if (f->state != LS_OPENED) {
|
---|
| 735 | *go = try;
|
---|
| 736 | }
|
---|
| 737 |
|
---|
| 738 | return 1;
|
---|
| 739 |
|
---|
| 740 | bad:
|
---|
| 741 | IPCPDEBUG(LOG_INFO, ("ipcp_nakci: received bad Nak!\n"));
|
---|
| 742 | return 0;
|
---|
| 743 | }
|
---|
| 744 |
|
---|
| 745 |
|
---|
| 746 | /*
|
---|
| 747 | * ipcp_rejci - Reject some of our CIs.
|
---|
| 748 | */
|
---|
| 749 | static int
|
---|
| 750 | ipcp_rejci(fsm *f, u_char *p, int len)
|
---|
| 751 | {
|
---|
| 752 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
| 753 | u_char cimaxslotindex, ciflag, cilen;
|
---|
| 754 | u_short cishort;
|
---|
| 755 | u32_t cilong;
|
---|
| 756 | ipcp_options try; /* options to request next time */
|
---|
| 757 |
|
---|
| 758 | try = *go;
|
---|
| 759 | /*
|
---|
| 760 | * Any Rejected CIs must be in exactly the same order that we sent.
|
---|
| 761 | * Check packet length and CI length at each step.
|
---|
| 762 | * If we find any deviations, then this packet is bad.
|
---|
| 763 | */
|
---|
| 764 | #define REJCIADDR(opt, neg, old, val1, val2) \
|
---|
| 765 | if (go->neg && \
|
---|
| 766 | len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
|
---|
| 767 | p[1] == cilen && \
|
---|
| 768 | p[0] == opt) { \
|
---|
| 769 | u32_t l; \
|
---|
| 770 | len -= cilen; \
|
---|
| 771 | INCPTR(2, p); \
|
---|
| 772 | GETLONG(l, p); \
|
---|
| 773 | cilong = htonl(l); \
|
---|
| 774 | /* Check rejected value. */ \
|
---|
| 775 | if (cilong != val1) { \
|
---|
| 776 | goto bad; \
|
---|
| 777 | } \
|
---|
| 778 | if (old) { \
|
---|
| 779 | GETLONG(l, p); \
|
---|
| 780 | cilong = htonl(l); \
|
---|
| 781 | /* Check rejected value. */ \
|
---|
| 782 | if (cilong != val2) { \
|
---|
| 783 | goto bad; \
|
---|
| 784 | } \
|
---|
| 785 | } \
|
---|
| 786 | try.neg = 0; \
|
---|
| 787 | }
|
---|
| 788 |
|
---|
| 789 | #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
|
---|
| 790 | if (go->neg && \
|
---|
| 791 | p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
|
---|
| 792 | len >= p[1] && \
|
---|
| 793 | p[0] == opt) { \
|
---|
| 794 | len -= p[1]; \
|
---|
| 795 | INCPTR(2, p); \
|
---|
| 796 | GETSHORT(cishort, p); \
|
---|
| 797 | /* Check rejected value. */ \
|
---|
| 798 | if (cishort != val) { \
|
---|
| 799 | goto bad; \
|
---|
| 800 | } \
|
---|
| 801 | if (!old) { \
|
---|
| 802 | GETCHAR(cimaxslotindex, p); \
|
---|
| 803 | if (cimaxslotindex != maxslot) { \
|
---|
| 804 | goto bad; \
|
---|
| 805 | } \
|
---|
| 806 | GETCHAR(ciflag, p); \
|
---|
| 807 | if (ciflag != cflag) { \
|
---|
| 808 | goto bad; \
|
---|
| 809 | } \
|
---|
| 810 | } \
|
---|
| 811 | try.neg = 0; \
|
---|
| 812 | }
|
---|
| 813 |
|
---|
| 814 | #define REJCIDNS(opt, neg, dnsaddr) \
|
---|
| 815 | if (go->neg && \
|
---|
| 816 | ((cilen = p[1]) == CILEN_ADDR) && \
|
---|
| 817 | len >= cilen && \
|
---|
| 818 | p[0] == opt) { \
|
---|
| 819 | u32_t l; \
|
---|
| 820 | len -= cilen; \
|
---|
| 821 | INCPTR(2, p); \
|
---|
| 822 | GETLONG(l, p); \
|
---|
| 823 | cilong = htonl(l); \
|
---|
| 824 | /* Check rejected value. */ \
|
---|
| 825 | if (cilong != dnsaddr) { \
|
---|
| 826 | goto bad; \
|
---|
| 827 | } \
|
---|
| 828 | try.neg = 0; \
|
---|
| 829 | }
|
---|
| 830 |
|
---|
| 831 | REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
|
---|
| 832 | go->old_addrs, go->ouraddr, go->hisaddr);
|
---|
| 833 |
|
---|
| 834 | REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
|
---|
| 835 | go->maxslotindex, go->cflag);
|
---|
| 836 |
|
---|
| 837 | REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
|
---|
| 838 |
|
---|
| 839 | REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
|
---|
| 840 |
|
---|
| 841 | /*
|
---|
| 842 | * If there are any remaining CIs, then this packet is bad.
|
---|
| 843 | */
|
---|
| 844 | if (len != 0) {
|
---|
| 845 | goto bad;
|
---|
| 846 | }
|
---|
| 847 | /*
|
---|
| 848 | * Now we can update state.
|
---|
| 849 | */
|
---|
| 850 | if (f->state != LS_OPENED) {
|
---|
| 851 | *go = try;
|
---|
| 852 | }
|
---|
| 853 | return 1;
|
---|
| 854 |
|
---|
| 855 | bad:
|
---|
| 856 | IPCPDEBUG(LOG_INFO, ("ipcp_rejci: received bad Reject!\n"));
|
---|
| 857 | return 0;
|
---|
| 858 | }
|
---|
| 859 |
|
---|
| 860 |
|
---|
| 861 | /*
|
---|
| 862 | * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
|
---|
| 863 | *
|
---|
| 864 | * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
|
---|
| 865 | * appropriately. If reject_if_disagree is non-zero, doesn't return
|
---|
| 866 | * CONFNAK; returns CONFREJ if it can't return CONFACK.
|
---|
| 867 | */
|
---|
| 868 | static int
|
---|
| 869 | ipcp_reqci(fsm *f, u_char *inp/* Requested CIs */,int *len/* Length of requested CIs */,int reject_if_disagree)
|
---|
| 870 | {
|
---|
| 871 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
|
---|
| 872 | ipcp_options *ho = &ipcp_hisoptions[f->unit];
|
---|
| 873 | ipcp_options *ao = &ipcp_allowoptions[f->unit];
|
---|
| 874 | #ifdef OLD_CI_ADDRS
|
---|
| 875 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
| 876 | #endif
|
---|
| 877 | u_char *cip, *next; /* Pointer to current and next CIs */
|
---|
| 878 | u_short cilen, citype; /* Parsed len, type */
|
---|
| 879 | u_short cishort; /* Parsed short value */
|
---|
| 880 | u32_t tl, ciaddr1; /* Parsed address values */
|
---|
| 881 | #ifdef OLD_CI_ADDRS
|
---|
| 882 | u32_t ciaddr2; /* Parsed address values */
|
---|
| 883 | #endif
|
---|
| 884 | int rc = CONFACK; /* Final packet return code */
|
---|
| 885 | int orc; /* Individual option return code */
|
---|
| 886 | u_char *p; /* Pointer to next char to parse */
|
---|
| 887 | u_char *ucp = inp; /* Pointer to current output char */
|
---|
| 888 | int l = *len; /* Length left */
|
---|
| 889 | u_char maxslotindex, cflag;
|
---|
| 890 | int d;
|
---|
| 891 |
|
---|
| 892 | cis_received[f->unit] = 1;
|
---|
| 893 |
|
---|
| 894 | /*
|
---|
| 895 | * Reset all his options.
|
---|
| 896 | */
|
---|
| 897 | BZERO(ho, sizeof(*ho));
|
---|
| 898 |
|
---|
| 899 | /*
|
---|
| 900 | * Process all his options.
|
---|
| 901 | */
|
---|
| 902 | next = inp;
|
---|
| 903 | while (l) {
|
---|
| 904 | orc = CONFACK; /* Assume success */
|
---|
| 905 | cip = p = next; /* Remember begining of CI */
|
---|
| 906 | if (l < 2 || /* Not enough data for CI header or */
|
---|
| 907 | p[1] < 2 || /* CI length too small or */
|
---|
| 908 | p[1] > l) { /* CI length too big? */
|
---|
| 909 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: bad CI length!\n"));
|
---|
| 910 | orc = CONFREJ; /* Reject bad CI */
|
---|
| 911 | cilen = (u_short)l;/* Reject till end of packet */
|
---|
| 912 | l = 0; /* Don't loop again */
|
---|
| 913 | goto endswitch;
|
---|
| 914 | }
|
---|
| 915 | GETCHAR(citype, p); /* Parse CI type */
|
---|
| 916 | GETCHAR(cilen, p); /* Parse CI length */
|
---|
| 917 | l -= cilen; /* Adjust remaining length */
|
---|
| 918 | next += cilen; /* Step to next CI */
|
---|
| 919 |
|
---|
| 920 | switch (citype) { /* Check CI type */
|
---|
| 921 | #ifdef OLD_CI_ADDRS /* Need to save space... */
|
---|
| 922 | case CI_ADDRS:
|
---|
| 923 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received ADDRS\n"));
|
---|
| 924 | if (!ao->neg_addr ||
|
---|
| 925 | cilen != CILEN_ADDRS) { /* Check CI length */
|
---|
| 926 | orc = CONFREJ; /* Reject CI */
|
---|
| 927 | break;
|
---|
| 928 | }
|
---|
| 929 |
|
---|
| 930 | /*
|
---|
| 931 | * If he has no address, or if we both have his address but
|
---|
| 932 | * disagree about it, then NAK it with our idea.
|
---|
| 933 | * In particular, if we don't know his address, but he does,
|
---|
| 934 | * then accept it.
|
---|
| 935 | */
|
---|
| 936 | GETLONG(tl, p); /* Parse source address (his) */
|
---|
| 937 | ciaddr1 = htonl(tl);
|
---|
| 938 | IPCPDEBUG(LOG_INFO, ("his addr %s\n", inet_ntoa(ciaddr1)));
|
---|
| 939 | if (ciaddr1 != wo->hisaddr
|
---|
| 940 | && (ciaddr1 == 0 || !wo->accept_remote)) {
|
---|
| 941 | orc = CONFNAK;
|
---|
| 942 | if (!reject_if_disagree) {
|
---|
| 943 | DECPTR(sizeof(u32_t), p);
|
---|
| 944 | tl = ntohl(wo->hisaddr);
|
---|
| 945 | PUTLONG(tl, p);
|
---|
| 946 | }
|
---|
| 947 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
|
---|
| 948 | /*
|
---|
| 949 | * If neither we nor he knows his address, reject the option.
|
---|
| 950 | */
|
---|
| 951 | orc = CONFREJ;
|
---|
| 952 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
|
---|
| 953 | break;
|
---|
| 954 | }
|
---|
| 955 |
|
---|
| 956 | /*
|
---|
| 957 | * If he doesn't know our address, or if we both have our address
|
---|
| 958 | * but disagree about it, then NAK it with our idea.
|
---|
| 959 | */
|
---|
| 960 | GETLONG(tl, p); /* Parse desination address (ours) */
|
---|
| 961 | ciaddr2 = htonl(tl);
|
---|
| 962 | IPCPDEBUG(LOG_INFO, ("our addr %s\n", inet_ntoa(ciaddr2)));
|
---|
| 963 | if (ciaddr2 != wo->ouraddr) {
|
---|
| 964 | if (ciaddr2 == 0 || !wo->accept_local) {
|
---|
| 965 | orc = CONFNAK;
|
---|
| 966 | if (!reject_if_disagree) {
|
---|
| 967 | DECPTR(sizeof(u32_t), p);
|
---|
| 968 | tl = ntohl(wo->ouraddr);
|
---|
| 969 | PUTLONG(tl, p);
|
---|
| 970 | }
|
---|
| 971 | } else {
|
---|
| 972 | go->ouraddr = ciaddr2; /* accept peer's idea */
|
---|
| 973 | }
|
---|
| 974 | }
|
---|
| 975 |
|
---|
| 976 | ho->neg_addr = 1;
|
---|
| 977 | ho->old_addrs = 1;
|
---|
| 978 | ho->hisaddr = ciaddr1;
|
---|
| 979 | ho->ouraddr = ciaddr2;
|
---|
| 980 | break;
|
---|
| 981 | #endif
|
---|
| 982 |
|
---|
| 983 | case CI_ADDR:
|
---|
| 984 | if (!ao->neg_addr) {
|
---|
| 985 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR not allowed\n"));
|
---|
| 986 | orc = CONFREJ; /* Reject CI */
|
---|
| 987 | break;
|
---|
| 988 | } else if (cilen != CILEN_ADDR) { /* Check CI length */
|
---|
| 989 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR bad len\n"));
|
---|
| 990 | orc = CONFREJ; /* Reject CI */
|
---|
| 991 | break;
|
---|
| 992 | }
|
---|
| 993 |
|
---|
| 994 | /*
|
---|
| 995 | * If he has no address, or if we both have his address but
|
---|
| 996 | * disagree about it, then NAK it with our idea.
|
---|
| 997 | * In particular, if we don't know his address, but he does,
|
---|
| 998 | * then accept it.
|
---|
| 999 | */
|
---|
| 1000 | GETLONG(tl, p); /* Parse source address (his) */
|
---|
| 1001 | ciaddr1 = htonl(tl);
|
---|
| 1002 | if (ciaddr1 != wo->hisaddr
|
---|
| 1003 | && (ciaddr1 == 0 || !wo->accept_remote)) {
|
---|
| 1004 | orc = CONFNAK;
|
---|
| 1005 | if (!reject_if_disagree) {
|
---|
| 1006 | DECPTR(sizeof(u32_t), p);
|
---|
| 1007 | tl = ntohl(wo->hisaddr);
|
---|
| 1008 | PUTLONG(tl, p);
|
---|
| 1009 | }
|
---|
| 1010 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Nak ADDR %s\n", inet_ntoa(ciaddr1)));
|
---|
| 1011 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
|
---|
| 1012 | /*
|
---|
| 1013 | * Don't ACK an address of 0.0.0.0 - reject it instead.
|
---|
| 1014 | */
|
---|
| 1015 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Reject ADDR %s\n", inet_ntoa(ciaddr1)));
|
---|
| 1016 | orc = CONFREJ;
|
---|
| 1017 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
|
---|
| 1018 | break;
|
---|
| 1019 | }
|
---|
| 1020 |
|
---|
| 1021 | ho->neg_addr = 1;
|
---|
| 1022 | ho->hisaddr = ciaddr1;
|
---|
| 1023 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: ADDR %s\n", inet_ntoa(ciaddr1)));
|
---|
| 1024 | break;
|
---|
| 1025 |
|
---|
| 1026 | case CI_MS_DNS1:
|
---|
| 1027 | case CI_MS_DNS2:
|
---|
| 1028 | /* Microsoft primary or secondary DNS request */
|
---|
| 1029 | d = citype == CI_MS_DNS2;
|
---|
| 1030 |
|
---|
| 1031 | /* If we do not have a DNS address then we cannot send it */
|
---|
| 1032 | if (ao->dnsaddr[d] == 0 ||
|
---|
| 1033 | cilen != CILEN_ADDR) { /* Check CI length */
|
---|
| 1034 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting DNS%d Request\n", d+1));
|
---|
| 1035 | orc = CONFREJ; /* Reject CI */
|
---|
| 1036 | break;
|
---|
| 1037 | }
|
---|
| 1038 | GETLONG(tl, p);
|
---|
| 1039 | if (htonl(tl) != ao->dnsaddr[d]) {
|
---|
| 1040 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking DNS%d Request %s\n",
|
---|
| 1041 | d+1, inet_ntoa(tl)));
|
---|
| 1042 | DECPTR(sizeof(u32_t), p);
|
---|
| 1043 | tl = ntohl(ao->dnsaddr[d]);
|
---|
| 1044 | PUTLONG(tl, p);
|
---|
| 1045 | orc = CONFNAK;
|
---|
| 1046 | }
|
---|
| 1047 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received DNS%d Request\n", d+1));
|
---|
| 1048 | break;
|
---|
| 1049 |
|
---|
| 1050 | case CI_MS_WINS1:
|
---|
| 1051 | case CI_MS_WINS2:
|
---|
| 1052 | /* Microsoft primary or secondary WINS request */
|
---|
| 1053 | d = citype == CI_MS_WINS2;
|
---|
| 1054 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: received WINS%d Request\n", d+1));
|
---|
| 1055 |
|
---|
| 1056 | /* If we do not have a DNS address then we cannot send it */
|
---|
| 1057 | if (ao->winsaddr[d] == 0 ||
|
---|
| 1058 | cilen != CILEN_ADDR) { /* Check CI length */
|
---|
| 1059 | orc = CONFREJ; /* Reject CI */
|
---|
| 1060 | break;
|
---|
| 1061 | }
|
---|
| 1062 | GETLONG(tl, p);
|
---|
| 1063 | if (htonl(tl) != ao->winsaddr[d]) {
|
---|
| 1064 | DECPTR(sizeof(u32_t), p);
|
---|
| 1065 | tl = ntohl(ao->winsaddr[d]);
|
---|
| 1066 | PUTLONG(tl, p);
|
---|
| 1067 | orc = CONFNAK;
|
---|
| 1068 | }
|
---|
| 1069 | break;
|
---|
| 1070 |
|
---|
| 1071 | case CI_COMPRESSTYPE:
|
---|
| 1072 | if (!ao->neg_vj) {
|
---|
| 1073 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE not allowed\n"));
|
---|
| 1074 | orc = CONFREJ;
|
---|
| 1075 | break;
|
---|
| 1076 | } else if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) {
|
---|
| 1077 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE len=%d\n", cilen));
|
---|
| 1078 | orc = CONFREJ;
|
---|
| 1079 | break;
|
---|
| 1080 | }
|
---|
| 1081 | GETSHORT(cishort, p);
|
---|
| 1082 |
|
---|
| 1083 | if (!(cishort == IPCP_VJ_COMP ||
|
---|
| 1084 | (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
|
---|
| 1085 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting COMPRESSTYPE %d\n", cishort));
|
---|
| 1086 | orc = CONFREJ;
|
---|
| 1087 | break;
|
---|
| 1088 | }
|
---|
| 1089 |
|
---|
| 1090 | ho->neg_vj = 1;
|
---|
| 1091 | ho->vj_protocol = cishort;
|
---|
| 1092 | if (cilen == CILEN_VJ) {
|
---|
| 1093 | GETCHAR(maxslotindex, p);
|
---|
| 1094 | if (maxslotindex > ao->maxslotindex) {
|
---|
| 1095 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ max slot %d\n", maxslotindex));
|
---|
| 1096 | orc = CONFNAK;
|
---|
| 1097 | if (!reject_if_disagree) {
|
---|
| 1098 | DECPTR(1, p);
|
---|
| 1099 | PUTCHAR(ao->maxslotindex, p);
|
---|
| 1100 | }
|
---|
| 1101 | }
|
---|
| 1102 | GETCHAR(cflag, p);
|
---|
| 1103 | if (cflag && !ao->cflag) {
|
---|
| 1104 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Naking VJ cflag %d\n", cflag));
|
---|
| 1105 | orc = CONFNAK;
|
---|
| 1106 | if (!reject_if_disagree) {
|
---|
| 1107 | DECPTR(1, p);
|
---|
| 1108 | PUTCHAR(wo->cflag, p);
|
---|
| 1109 | }
|
---|
| 1110 | }
|
---|
| 1111 | ho->maxslotindex = maxslotindex;
|
---|
| 1112 | ho->cflag = cflag;
|
---|
| 1113 | } else {
|
---|
| 1114 | ho->old_vj = 1;
|
---|
| 1115 | ho->maxslotindex = MAX_SLOTS - 1;
|
---|
| 1116 | ho->cflag = 1;
|
---|
| 1117 | }
|
---|
| 1118 | IPCPDEBUG(LOG_INFO, (
|
---|
| 1119 | "ipcp_reqci: received COMPRESSTYPE p=%d old=%d maxslot=%d cflag=%d\n",
|
---|
| 1120 | ho->vj_protocol, ho->old_vj, ho->maxslotindex, ho->cflag));
|
---|
| 1121 | break;
|
---|
| 1122 |
|
---|
| 1123 | default:
|
---|
| 1124 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting unknown CI type %d\n", citype));
|
---|
| 1125 | orc = CONFREJ;
|
---|
| 1126 | break;
|
---|
| 1127 | }
|
---|
| 1128 |
|
---|
| 1129 | endswitch:
|
---|
| 1130 | if (orc == CONFACK && /* Good CI */
|
---|
| 1131 | rc != CONFACK) { /* but prior CI wasnt? */
|
---|
| 1132 | continue; /* Don't send this one */
|
---|
| 1133 | }
|
---|
| 1134 |
|
---|
| 1135 | if (orc == CONFNAK) { /* Nak this CI? */
|
---|
| 1136 | if (reject_if_disagree) { /* Getting fed up with sending NAKs? */
|
---|
| 1137 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Rejecting too many naks\n"));
|
---|
| 1138 | orc = CONFREJ; /* Get tough if so */
|
---|
| 1139 | } else {
|
---|
| 1140 | if (rc == CONFREJ) { /* Rejecting prior CI? */
|
---|
| 1141 | continue; /* Don't send this one */
|
---|
| 1142 | }
|
---|
| 1143 | if (rc == CONFACK) { /* Ack'd all prior CIs? */
|
---|
| 1144 | rc = CONFNAK; /* Not anymore... */
|
---|
| 1145 | ucp = inp; /* Backup */
|
---|
| 1146 | }
|
---|
| 1147 | }
|
---|
| 1148 | }
|
---|
| 1149 |
|
---|
| 1150 | if (orc == CONFREJ && /* Reject this CI */
|
---|
| 1151 | rc != CONFREJ) { /* but no prior ones? */
|
---|
| 1152 | rc = CONFREJ;
|
---|
| 1153 | ucp = inp; /* Backup */
|
---|
| 1154 | }
|
---|
| 1155 |
|
---|
| 1156 | /* Need to move CI? */
|
---|
| 1157 | if (ucp != cip) {
|
---|
| 1158 | BCOPY(cip, ucp, cilen); /* Move it */
|
---|
| 1159 | }
|
---|
| 1160 |
|
---|
| 1161 | /* Update output pointer */
|
---|
| 1162 | INCPTR(cilen, ucp);
|
---|
| 1163 | }
|
---|
| 1164 |
|
---|
| 1165 | /*
|
---|
| 1166 | * If we aren't rejecting this packet, and we want to negotiate
|
---|
| 1167 | * their address, and they didn't send their address, then we
|
---|
| 1168 | * send a NAK with a CI_ADDR option appended. We assume the
|
---|
| 1169 | * input buffer is long enough that we can append the extra
|
---|
| 1170 | * option safely.
|
---|
| 1171 | */
|
---|
| 1172 | if (rc != CONFREJ && !ho->neg_addr &&
|
---|
| 1173 | wo->req_addr && !reject_if_disagree) {
|
---|
| 1174 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: Requesting peer address\n"));
|
---|
| 1175 | if (rc == CONFACK) {
|
---|
| 1176 | rc = CONFNAK;
|
---|
| 1177 | ucp = inp; /* reset pointer */
|
---|
| 1178 | wo->req_addr = 0; /* don't ask again */
|
---|
| 1179 | }
|
---|
| 1180 | PUTCHAR(CI_ADDR, ucp);
|
---|
| 1181 | PUTCHAR(CILEN_ADDR, ucp);
|
---|
| 1182 | tl = ntohl(wo->hisaddr);
|
---|
| 1183 | PUTLONG(tl, ucp);
|
---|
| 1184 | }
|
---|
| 1185 |
|
---|
| 1186 | *len = (int)(ucp - inp); /* Compute output length */
|
---|
| 1187 | IPCPDEBUG(LOG_INFO, ("ipcp_reqci: returning Configure-%s\n", CODENAME(rc)));
|
---|
| 1188 | return (rc); /* Return final code */
|
---|
| 1189 | }
|
---|
| 1190 |
|
---|
| 1191 |
|
---|
| 1192 | #if 0
|
---|
| 1193 | /*
|
---|
| 1194 | * ip_check_options - check that any IP-related options are OK,
|
---|
| 1195 | * and assign appropriate defaults.
|
---|
| 1196 | */
|
---|
| 1197 | static void
|
---|
| 1198 | ip_check_options(u_long localAddr)
|
---|
| 1199 | {
|
---|
| 1200 | ipcp_options *wo = &ipcp_wantoptions[0];
|
---|
| 1201 |
|
---|
| 1202 | /*
|
---|
| 1203 | * Load our default IP address but allow the remote host to give us
|
---|
| 1204 | * a new address.
|
---|
| 1205 | */
|
---|
| 1206 | if (wo->ouraddr == 0 && !ppp_settings.disable_defaultip) {
|
---|
| 1207 | wo->accept_local = 1; /* don't insist on this default value */
|
---|
| 1208 | wo->ouraddr = htonl(localAddr);
|
---|
| 1209 | }
|
---|
| 1210 | }
|
---|
| 1211 | #endif
|
---|
| 1212 |
|
---|
| 1213 |
|
---|
| 1214 | /*
|
---|
| 1215 | * ipcp_up - IPCP has come UP.
|
---|
| 1216 | *
|
---|
| 1217 | * Configure the IP network interface appropriately and bring it up.
|
---|
| 1218 | */
|
---|
| 1219 | static void
|
---|
| 1220 | ipcp_up(fsm *f)
|
---|
| 1221 | {
|
---|
| 1222 | u32_t mask;
|
---|
| 1223 | ipcp_options *ho = &ipcp_hisoptions[f->unit];
|
---|
| 1224 | ipcp_options *go = &ipcp_gotoptions[f->unit];
|
---|
| 1225 | ipcp_options *wo = &ipcp_wantoptions[f->unit];
|
---|
| 1226 |
|
---|
| 1227 | np_up(f->unit, PPP_IP);
|
---|
| 1228 | IPCPDEBUG(LOG_INFO, ("ipcp: up\n"));
|
---|
| 1229 |
|
---|
| 1230 | /*
|
---|
| 1231 | * We must have a non-zero IP address for both ends of the link.
|
---|
| 1232 | */
|
---|
| 1233 | if (!ho->neg_addr) {
|
---|
| 1234 | ho->hisaddr = wo->hisaddr;
|
---|
| 1235 | }
|
---|
| 1236 |
|
---|
| 1237 | if (ho->hisaddr == 0) {
|
---|
| 1238 | IPCPDEBUG(LOG_ERR, ("Could not determine remote IP address\n"));
|
---|
| 1239 | ipcp_close(f->unit, "Could not determine remote IP address");
|
---|
| 1240 | return;
|
---|
| 1241 | }
|
---|
| 1242 | if (go->ouraddr == 0) {
|
---|
| 1243 | IPCPDEBUG(LOG_ERR, ("Could not determine local IP address\n"));
|
---|
| 1244 | ipcp_close(f->unit, "Could not determine local IP address");
|
---|
| 1245 | return;
|
---|
| 1246 | }
|
---|
| 1247 |
|
---|
| 1248 | if (ppp_settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
|
---|
| 1249 | /*pppGotDNSAddrs(go->dnsaddr[0], go->dnsaddr[1]);*/
|
---|
| 1250 | }
|
---|
| 1251 |
|
---|
| 1252 | /*
|
---|
| 1253 | * Check that the peer is allowed to use the IP address it wants.
|
---|
| 1254 | */
|
---|
| 1255 | if (!auth_ip_addr(f->unit, ho->hisaddr)) {
|
---|
| 1256 | IPCPDEBUG(LOG_ERR, ("Peer is not authorized to use remote address %s\n",
|
---|
| 1257 | inet_ntoa(ho->hisaddr)));
|
---|
| 1258 | ipcp_close(f->unit, "Unauthorized remote IP address");
|
---|
| 1259 | return;
|
---|
| 1260 | }
|
---|
| 1261 |
|
---|
| 1262 | /* set tcp compression */
|
---|
| 1263 | sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
|
---|
| 1264 |
|
---|
| 1265 | /*
|
---|
| 1266 | * Set IP addresses and (if specified) netmask.
|
---|
| 1267 | */
|
---|
| 1268 | mask = GetMask(go->ouraddr);
|
---|
| 1269 |
|
---|
| 1270 | if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask, go->dnsaddr[0], go->dnsaddr[1])) {
|
---|
| 1271 | IPCPDEBUG(LOG_WARNING, ("sifaddr failed\n"));
|
---|
| 1272 | ipcp_close(f->unit, "Interface configuration failed");
|
---|
| 1273 | return;
|
---|
| 1274 | }
|
---|
| 1275 |
|
---|
| 1276 | /* bring the interface up for IP */
|
---|
| 1277 | if (!sifup(f->unit)) {
|
---|
| 1278 | IPCPDEBUG(LOG_WARNING, ("sifup failed\n"));
|
---|
| 1279 | ipcp_close(f->unit, "Interface configuration failed");
|
---|
| 1280 | return;
|
---|
| 1281 | }
|
---|
| 1282 |
|
---|
| 1283 | sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
|
---|
| 1284 |
|
---|
| 1285 | /* assign a default route through the interface if required */
|
---|
| 1286 | if (ipcp_wantoptions[f->unit].default_route) {
|
---|
| 1287 | if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) {
|
---|
| 1288 | default_route_set[f->unit] = 1;
|
---|
| 1289 | }
|
---|
| 1290 | }
|
---|
| 1291 |
|
---|
| 1292 | IPCPDEBUG(LOG_NOTICE, ("local IP address %s\n", inet_ntoa(go->ouraddr)));
|
---|
| 1293 | IPCPDEBUG(LOG_NOTICE, ("remote IP address %s\n", inet_ntoa(ho->hisaddr)));
|
---|
| 1294 | if (go->dnsaddr[0]) {
|
---|
| 1295 | IPCPDEBUG(LOG_NOTICE, ("primary DNS address %s\n", inet_ntoa(go->dnsaddr[0])));
|
---|
| 1296 | }
|
---|
| 1297 | if (go->dnsaddr[1]) {
|
---|
| 1298 | IPCPDEBUG(LOG_NOTICE, ("secondary DNS address %s\n", inet_ntoa(go->dnsaddr[1])));
|
---|
| 1299 | }
|
---|
| 1300 | }
|
---|
| 1301 |
|
---|
| 1302 |
|
---|
| 1303 | /*
|
---|
| 1304 | * ipcp_down - IPCP has gone DOWN.
|
---|
| 1305 | *
|
---|
| 1306 | * Take the IP network interface down, clear its addresses
|
---|
| 1307 | * and delete routes through it.
|
---|
| 1308 | */
|
---|
| 1309 | static void
|
---|
| 1310 | ipcp_down(fsm *f)
|
---|
| 1311 | {
|
---|
| 1312 | IPCPDEBUG(LOG_INFO, ("ipcp: down\n"));
|
---|
| 1313 | np_down(f->unit, PPP_IP);
|
---|
| 1314 | sifvjcomp(f->unit, 0, 0, 0);
|
---|
| 1315 |
|
---|
| 1316 | sifdown(f->unit);
|
---|
| 1317 | ipcp_clear_addrs(f->unit);
|
---|
| 1318 | }
|
---|
| 1319 |
|
---|
| 1320 |
|
---|
| 1321 | /*
|
---|
| 1322 | * ipcp_clear_addrs() - clear the interface addresses, routes, etc.
|
---|
| 1323 | */
|
---|
| 1324 | static void
|
---|
| 1325 | ipcp_clear_addrs(int unit)
|
---|
| 1326 | {
|
---|
| 1327 | u32_t ouraddr, hisaddr;
|
---|
| 1328 |
|
---|
| 1329 | ouraddr = ipcp_gotoptions[unit].ouraddr;
|
---|
| 1330 | hisaddr = ipcp_hisoptions[unit].hisaddr;
|
---|
| 1331 | if (default_route_set[unit]) {
|
---|
| 1332 | cifdefaultroute(unit, ouraddr, hisaddr);
|
---|
| 1333 | default_route_set[unit] = 0;
|
---|
| 1334 | }
|
---|
| 1335 | cifaddr(unit, ouraddr, hisaddr);
|
---|
| 1336 | }
|
---|
| 1337 |
|
---|
| 1338 |
|
---|
| 1339 | /*
|
---|
| 1340 | * ipcp_finished - possibly shut down the lower layers.
|
---|
| 1341 | */
|
---|
| 1342 | static void
|
---|
| 1343 | ipcp_finished(fsm *f)
|
---|
| 1344 | {
|
---|
| 1345 | np_finished(f->unit, PPP_IP);
|
---|
| 1346 | }
|
---|
| 1347 |
|
---|
| 1348 | #if PPP_ADDITIONAL_CALLBACKS
|
---|
| 1349 | static int
|
---|
| 1350 | ipcp_printpkt(u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
|
---|
| 1351 | {
|
---|
| 1352 | LWIP_UNUSED_ARG(p);
|
---|
| 1353 | LWIP_UNUSED_ARG(plen);
|
---|
| 1354 | LWIP_UNUSED_ARG(printer);
|
---|
| 1355 | LWIP_UNUSED_ARG(arg);
|
---|
| 1356 | return 0;
|
---|
| 1357 | }
|
---|
| 1358 |
|
---|
| 1359 | /*
|
---|
| 1360 | * ip_active_pkt - see if this IP packet is worth bringing the link up for.
|
---|
| 1361 | * We don't bring the link up for IP fragments or for TCP FIN packets
|
---|
| 1362 | * with no data.
|
---|
| 1363 | */
|
---|
| 1364 | #define IP_HDRLEN 20 /* bytes */
|
---|
| 1365 | #define IP_OFFMASK 0x1fff
|
---|
| 1366 | #define IPPROTO_TCP 6
|
---|
| 1367 | #define TCP_HDRLEN 20
|
---|
| 1368 | #define TH_FIN 0x01
|
---|
| 1369 |
|
---|
| 1370 | /*
|
---|
| 1371 | * We use these macros because the IP header may be at an odd address,
|
---|
| 1372 | * and some compilers might use word loads to get th_off or ip_hl.
|
---|
| 1373 | */
|
---|
| 1374 |
|
---|
| 1375 | #define net_short(x) (((x)[0] << 8) + (x)[1])
|
---|
| 1376 | #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
|
---|
| 1377 | #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
|
---|
| 1378 | #define get_ipproto(x) (((unsigned char *)(x))[9])
|
---|
| 1379 | #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
|
---|
| 1380 | #define get_tcpflags(x) (((unsigned char *)(x))[13])
|
---|
| 1381 |
|
---|
| 1382 | static int
|
---|
| 1383 | ip_active_pkt(u_char *pkt, int len)
|
---|
| 1384 | {
|
---|
| 1385 | u_char *tcp;
|
---|
| 1386 | int hlen;
|
---|
| 1387 |
|
---|
| 1388 | len -= PPP_HDRLEN;
|
---|
| 1389 | pkt += PPP_HDRLEN;
|
---|
| 1390 | if (len < IP_HDRLEN) {
|
---|
| 1391 | return 0;
|
---|
| 1392 | }
|
---|
| 1393 | if ((get_ipoff(pkt) & IP_OFFMASK) != 0) {
|
---|
| 1394 | return 0;
|
---|
| 1395 | }
|
---|
| 1396 | if (get_ipproto(pkt) != IPPROTO_TCP) {
|
---|
| 1397 | return 1;
|
---|
| 1398 | }
|
---|
| 1399 | hlen = get_iphl(pkt) * 4;
|
---|
| 1400 | if (len < hlen + TCP_HDRLEN) {
|
---|
| 1401 | return 0;
|
---|
| 1402 | }
|
---|
| 1403 | tcp = pkt + hlen;
|
---|
| 1404 | if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) {
|
---|
| 1405 | return 0;
|
---|
| 1406 | }
|
---|
| 1407 | return 1;
|
---|
| 1408 | }
|
---|
| 1409 | #endif /* PPP_ADDITIONAL_CALLBACKS */
|
---|
| 1410 |
|
---|
| 1411 | #endif /* PPP_SUPPORT */
|
---|