[d0950ad] | 1 | /* |
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| 2 | * ipcp.c - PPP IP Control Protocol. |
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| 3 | * |
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| 4 | * Copyright (c) 1989 Carnegie Mellon University. |
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| 5 | * All rights reserved. |
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| 6 | * |
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| 7 | * Redistribution and use in source and binary forms are permitted |
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| 8 | * provided that the above copyright notice and this paragraph are |
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| 9 | * duplicated in all such forms and that any documentation, |
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| 10 | * advertising materials, and other materials related to such |
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| 11 | * distribution and use acknowledge that the software was developed |
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| 12 | * by Carnegie Mellon University. The name of the |
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| 13 | * University may not be used to endorse or promote products derived |
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| 14 | * from this software without specific prior written permission. |
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| 15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 18 | */ |
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| 19 | |
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| 20 | #ifndef lint |
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| 21 | /* static char rcsid[] = "$Id$"; */ |
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| 22 | #endif |
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| 23 | |
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| 24 | /* |
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| 25 | * TODO: |
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| 26 | */ |
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| 27 | |
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| 28 | #include <stdio.h> |
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| 29 | #include <string.h> |
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| 30 | #include <syslog.h> |
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| 31 | #include <netdb.h> |
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| 32 | #include <sys/param.h> |
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| 33 | #include <sys/types.h> |
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| 34 | #include <sys/socket.h> |
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| 35 | #include <netinet/in.h> |
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| 36 | /* #include <stbconfig.h> */ |
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| 37 | |
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| 38 | #include "pppd.h" |
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| 39 | #include "fsm.h" |
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| 40 | #include "ipcp.h" |
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| 41 | #include "pathnames.h" |
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| 42 | |
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| 43 | /* global vars */ |
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| 44 | ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */ |
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| 45 | ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ |
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| 46 | ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ |
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| 47 | ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ |
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| 48 | |
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| 49 | /* local vars */ |
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| 50 | static int cis_received[NUM_PPP]; /* # Conf-Reqs received */ |
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| 51 | static int default_route_set[NUM_PPP]; /* Have set up a default route */ |
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| 52 | static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */ |
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| 53 | |
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| 54 | /* |
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| 55 | * Callbacks for fsm code. (CI = Configuration Information) |
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| 56 | */ |
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| 57 | static void ipcp_resetci __P((fsm *)); /* Reset our CI */ |
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| 58 | static int ipcp_cilen __P((fsm *)); /* Return length of our CI */ |
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| 59 | static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ |
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| 60 | static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ |
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| 61 | static int ipcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ |
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| 62 | static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ |
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| 63 | static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ |
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| 64 | static void ipcp_up __P((fsm *)); /* We're UP */ |
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| 65 | static void ipcp_down __P((fsm *)); /* We're DOWN */ |
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| 66 | #if 0 |
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| 67 | static void ipcp_script __P((fsm *, char *)); /* Run an up/down script */ |
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| 68 | #endif |
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| 69 | static void ipcp_finished __P((fsm *)); /* Don't need lower layer */ |
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| 70 | |
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| 71 | fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */ |
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| 72 | |
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| 73 | static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */ |
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| 74 | ipcp_resetci, /* Reset our Configuration Information */ |
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| 75 | ipcp_cilen, /* Length of our Configuration Information */ |
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| 76 | ipcp_addci, /* Add our Configuration Information */ |
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| 77 | ipcp_ackci, /* ACK our Configuration Information */ |
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| 78 | ipcp_nakci, /* NAK our Configuration Information */ |
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| 79 | ipcp_rejci, /* Reject our Configuration Information */ |
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| 80 | ipcp_reqci, /* Request peer's Configuration Information */ |
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| 81 | ipcp_up, /* Called when fsm reaches OPENED state */ |
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| 82 | ipcp_down, /* Called when fsm leaves OPENED state */ |
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| 83 | NULL, /* Called when we want the lower layer up */ |
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| 84 | ipcp_finished, /* Called when we want the lower layer down */ |
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| 85 | NULL, /* Called when Protocol-Reject received */ |
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| 86 | NULL, /* Retransmission is necessary */ |
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| 87 | NULL, /* Called to handle protocol-specific codes */ |
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| 88 | "IPCP" /* String name of protocol */ |
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| 89 | }; |
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| 90 | |
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| 91 | /* |
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| 92 | * Protocol entry points from main code. |
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| 93 | */ |
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| 94 | static void ipcp_init __P((int)); |
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| 95 | static void ipcp_open __P((int)); |
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| 96 | static void ipcp_close __P((int, char *)); |
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| 97 | static void ipcp_lowerup __P((int)); |
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| 98 | static void ipcp_lowerdown __P((int)); |
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| 99 | static void ipcp_input __P((int, u_char *, int)); |
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| 100 | static void ipcp_protrej __P((int)); |
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| 101 | static int ipcp_printpkt __P((u_char *, int, |
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| 102 | void (*) __P((void *, char *, ...)), void *)); |
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| 103 | static void ip_check_options __P((void)); |
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| 104 | static int ip_demand_conf __P((int)); |
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| 105 | static int ip_active_pkt __P((u_char *, int)); |
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| 106 | |
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| 107 | struct protent ipcp_protent = { |
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| 108 | PPP_IPCP, |
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| 109 | ipcp_init, |
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| 110 | ipcp_input, |
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| 111 | ipcp_protrej, |
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| 112 | ipcp_lowerup, |
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| 113 | ipcp_lowerdown, |
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| 114 | ipcp_open, |
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| 115 | ipcp_close, |
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| 116 | ipcp_printpkt, |
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| 117 | NULL, |
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| 118 | 1, |
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| 119 | "IPCP", |
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| 120 | ip_check_options, |
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| 121 | ip_demand_conf, |
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| 122 | ip_active_pkt |
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| 123 | }; |
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| 124 | |
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| 125 | static void ipcp_clear_addrs __P((int)); |
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| 126 | |
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| 127 | /* |
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| 128 | * Lengths of configuration options. |
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| 129 | */ |
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| 130 | #define CILEN_VOID 2 |
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| 131 | #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */ |
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| 132 | #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */ |
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| 133 | #define CILEN_ADDR 6 /* new-style single address option */ |
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| 134 | #define CILEN_ADDRS 10 /* old-style dual address option */ |
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| 135 | |
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| 136 | |
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| 137 | #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ |
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| 138 | (x) == CONFNAK ? "NAK" : "REJ") |
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| 139 | |
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| 140 | |
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| 141 | /* |
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| 142 | * Make a string representation of a network IP address. |
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| 143 | */ |
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| 144 | char * |
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| 145 | ip_ntoa(ipaddr) |
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| 146 | u_int32_t ipaddr; |
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| 147 | { |
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| 148 | static char b[64]; |
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| 149 | |
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| 150 | ipaddr = ntohl(ipaddr); |
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| 151 | |
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| 152 | sprintf(b, "%d.%d.%d.%d", |
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| 153 | (u_char)(ipaddr >> 24), |
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| 154 | (u_char)(ipaddr >> 16), |
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| 155 | (u_char)(ipaddr >> 8), |
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| 156 | (u_char)(ipaddr)); |
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| 157 | return b; |
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| 158 | } |
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| 159 | |
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| 160 | |
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| 161 | /* |
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| 162 | * ipcp_init - Initialize IPCP. |
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| 163 | */ |
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| 164 | static void |
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| 165 | ipcp_init(unit) |
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| 166 | int unit; |
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| 167 | { |
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| 168 | fsm *f = &ipcp_fsm[unit]; |
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| 169 | ipcp_options *wo = &ipcp_wantoptions[unit]; |
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| 170 | ipcp_options *ao = &ipcp_allowoptions[unit]; |
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| 171 | |
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| 172 | f->unit = unit; |
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| 173 | f->protocol = PPP_IPCP; |
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| 174 | f->callbacks = &ipcp_callbacks; |
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| 175 | fsm_init(&ipcp_fsm[unit]); |
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| 176 | |
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| 177 | memset(wo, 0, sizeof(*wo)); |
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| 178 | memset(ao, 0, sizeof(*ao)); |
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| 179 | |
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| 180 | wo->neg_addr = 1; |
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| 181 | wo->neg_vj = 1; |
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| 182 | wo->vj_protocol = IPCP_VJ_COMP; |
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| 183 | wo->maxslotindex = MAX_STATES - 1; /* really max index */ |
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| 184 | wo->cflag = 1; |
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| 185 | ipcp_wantoptions[0].default_route = 1; |
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| 186 | /* max slots and slot-id compression are currently hardwired in */ |
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| 187 | /* ppp_if.c to 16 and 1, this needs to be changed (among other */ |
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| 188 | /* things) gmc */ |
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| 189 | |
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| 190 | ao->neg_addr = 1; |
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| 191 | ao->neg_vj = 1; |
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| 192 | ao->maxslotindex = MAX_STATES - 1; |
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| 193 | ao->cflag = 1; |
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| 194 | |
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| 195 | /* |
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| 196 | * XXX These control whether the user may use the proxyarp |
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| 197 | * and defaultroute options. |
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| 198 | */ |
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| 199 | ao->proxy_arp = 1; |
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| 200 | ao->default_route = 1; |
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| 201 | } |
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| 202 | |
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| 203 | |
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| 204 | /* |
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| 205 | * ipcp_open - IPCP is allowed to come up. |
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| 206 | */ |
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| 207 | static void |
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| 208 | ipcp_open(unit) |
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| 209 | int unit; |
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| 210 | { |
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| 211 | fsm_open(&ipcp_fsm[unit]); |
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| 212 | } |
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| 213 | |
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| 214 | |
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| 215 | /* |
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| 216 | * ipcp_close - Take IPCP down. |
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| 217 | */ |
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| 218 | static void |
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| 219 | ipcp_close(unit, reason) |
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| 220 | int unit; |
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| 221 | char *reason; |
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| 222 | { |
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| 223 | fsm_close(&ipcp_fsm[unit], reason); |
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| 224 | } |
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| 225 | |
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| 226 | |
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| 227 | /* |
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| 228 | * ipcp_lowerup - The lower layer is up. |
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| 229 | */ |
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| 230 | static void |
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| 231 | ipcp_lowerup(unit) |
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| 232 | int unit; |
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| 233 | { |
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| 234 | fsm_lowerup(&ipcp_fsm[unit]); |
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| 235 | } |
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| 236 | |
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| 237 | |
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| 238 | /* |
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| 239 | * ipcp_lowerdown - The lower layer is down. |
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| 240 | */ |
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| 241 | static void |
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| 242 | ipcp_lowerdown(unit) |
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| 243 | int unit; |
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| 244 | { |
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| 245 | fsm_lowerdown(&ipcp_fsm[unit]); |
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| 246 | } |
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| 247 | |
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| 248 | |
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| 249 | /* |
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| 250 | * ipcp_input - Input IPCP packet. |
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| 251 | */ |
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| 252 | static void |
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| 253 | ipcp_input(unit, p, len) |
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| 254 | int unit; |
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| 255 | u_char *p; |
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| 256 | int len; |
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| 257 | { |
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| 258 | fsm_input(&ipcp_fsm[unit], p, len); |
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| 259 | } |
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| 260 | |
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| 261 | |
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| 262 | /* |
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| 263 | * ipcp_protrej - A Protocol-Reject was received for IPCP. |
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| 264 | * |
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| 265 | * Pretend the lower layer went down, so we shut up. |
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| 266 | */ |
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| 267 | static void |
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| 268 | ipcp_protrej(unit) |
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| 269 | int unit; |
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| 270 | { |
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| 271 | fsm_lowerdown(&ipcp_fsm[unit]); |
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| 272 | } |
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| 273 | |
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| 274 | |
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| 275 | /* |
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| 276 | * ipcp_resetci - Reset our CI. |
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| 277 | */ |
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| 278 | static void |
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| 279 | ipcp_resetci(f) |
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| 280 | 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 | if (wo->hisaddr == 0) |
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| 288 | wo->accept_remote = 1; |
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| 289 | ipcp_gotoptions[f->unit] = *wo; |
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| 290 | cis_received[f->unit] = 0; |
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| 291 | } |
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| 292 | |
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| 293 | |
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| 294 | /* |
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| 295 | * ipcp_cilen - Return length of our CI. |
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| 296 | */ |
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| 297 | static int |
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| 298 | ipcp_cilen(f) |
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| 299 | fsm *f; |
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| 300 | { |
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| 301 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
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| 302 | ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
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| 303 | ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
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| 304 | |
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| 305 | #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) |
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| 306 | #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0) |
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| 307 | |
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| 308 | /* |
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| 309 | * First see if we want to change our options to the old |
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| 310 | * forms because we have received old forms from the peer. |
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| 311 | */ |
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| 312 | if (wo->neg_addr && !go->neg_addr && !go->old_addrs) { |
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| 313 | /* use the old style of address negotiation */ |
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| 314 | go->neg_addr = 1; |
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| 315 | go->old_addrs = 1; |
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| 316 | } |
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| 317 | if (wo->neg_vj && !go->neg_vj && !go->old_vj) { |
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| 318 | /* try an older style of VJ negotiation */ |
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| 319 | if (cis_received[f->unit] == 0) { |
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| 320 | /* keep trying the new style until we see some CI from the peer */ |
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| 321 | go->neg_vj = 1; |
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| 322 | } else { |
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| 323 | /* use the old style only if the peer did */ |
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| 324 | if (ho->neg_vj && ho->old_vj) { |
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| 325 | go->neg_vj = 1; |
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| 326 | go->old_vj = 1; |
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| 327 | go->vj_protocol = ho->vj_protocol; |
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| 328 | } |
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| 329 | } |
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| 330 | } |
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| 331 | |
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| 332 | return (LENCIADDR(go->neg_addr, go->old_addrs) + |
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| 333 | LENCIVJ(go->neg_vj, go->old_vj)); |
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| 334 | } |
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| 335 | |
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| 336 | |
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| 337 | /* |
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| 338 | * ipcp_addci - Add our desired CIs to a packet. |
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| 339 | */ |
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| 340 | static void |
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| 341 | ipcp_addci(f, ucp, lenp) |
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| 342 | fsm *f; |
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| 343 | u_char *ucp; |
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| 344 | int *lenp; |
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| 345 | { |
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| 346 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
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| 347 | int len = *lenp; |
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| 348 | |
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| 349 | #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \ |
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| 350 | if (neg) { \ |
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| 351 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ |
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| 352 | if (len >= vjlen) { \ |
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| 353 | PUTCHAR(opt, ucp); \ |
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| 354 | PUTCHAR(vjlen, ucp); \ |
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| 355 | PUTSHORT(val, ucp); \ |
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| 356 | if (!old) { \ |
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| 357 | PUTCHAR(maxslotindex, ucp); \ |
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| 358 | PUTCHAR(cflag, ucp); \ |
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| 359 | } \ |
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| 360 | len -= vjlen; \ |
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| 361 | } else \ |
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| 362 | neg = 0; \ |
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| 363 | } |
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| 364 | |
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| 365 | #define ADDCIADDR(opt, neg, old, val1, val2) \ |
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| 366 | if (neg) { \ |
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| 367 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ |
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| 368 | if (len >= addrlen) { \ |
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| 369 | u_int32_t l; \ |
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| 370 | PUTCHAR(opt, ucp); \ |
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| 371 | PUTCHAR(addrlen, ucp); \ |
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| 372 | l = ntohl(val1); \ |
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| 373 | PUTLONG(l, ucp); \ |
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| 374 | if (old) { \ |
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| 375 | l = ntohl(val2); \ |
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| 376 | PUTLONG(l, ucp); \ |
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| 377 | } \ |
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| 378 | len -= addrlen; \ |
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| 379 | } else \ |
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| 380 | neg = 0; \ |
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| 381 | } |
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| 382 | |
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| 383 | ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, |
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| 384 | go->old_addrs, go->ouraddr, go->hisaddr); |
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| 385 | |
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| 386 | ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, |
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| 387 | go->maxslotindex, go->cflag); |
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| 388 | |
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| 389 | *lenp -= len; |
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| 390 | } |
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| 391 | |
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| 392 | |
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| 393 | /* |
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| 394 | * ipcp_ackci - Ack our CIs. |
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| 395 | * |
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| 396 | * Returns: |
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| 397 | * 0 - Ack was bad. |
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| 398 | * 1 - Ack was good. |
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| 399 | */ |
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| 400 | static int |
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| 401 | ipcp_ackci(f, p, len) |
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| 402 | fsm *f; |
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| 403 | u_char *p; |
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| 404 | int len; |
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| 405 | { |
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| 406 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
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| 407 | u_short cilen, citype, cishort; |
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| 408 | u_int32_t cilong; |
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| 409 | u_char cimaxslotindex, cicflag; |
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| 410 | |
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| 411 | /* |
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| 412 | * CIs must be in exactly the same order that we sent... |
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| 413 | * Check packet length and CI length at each step. |
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| 414 | * If we find any deviations, then this packet is bad. |
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| 415 | */ |
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| 416 | |
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| 417 | #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \ |
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| 418 | if (neg) { \ |
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| 419 | int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ |
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| 420 | if ((len -= vjlen) < 0) \ |
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| 421 | goto bad; \ |
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| 422 | GETCHAR(citype, p); \ |
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| 423 | GETCHAR(cilen, p); \ |
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| 424 | if (cilen != vjlen || \ |
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| 425 | citype != opt) \ |
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| 426 | goto bad; \ |
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| 427 | GETSHORT(cishort, p); \ |
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| 428 | if (cishort != val) \ |
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| 429 | goto bad; \ |
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| 430 | if (!old) { \ |
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| 431 | GETCHAR(cimaxslotindex, p); \ |
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| 432 | if (cimaxslotindex != maxslotindex) \ |
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| 433 | goto bad; \ |
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| 434 | GETCHAR(cicflag, p); \ |
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| 435 | if (cicflag != cflag) \ |
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| 436 | goto bad; \ |
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| 437 | } \ |
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| 438 | } |
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| 439 | |
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| 440 | #define ACKCIADDR(opt, neg, old, val1, val2) \ |
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| 441 | if (neg) { \ |
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| 442 | int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \ |
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| 443 | u_int32_t l; \ |
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| 444 | if ((len -= addrlen) < 0) \ |
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| 445 | goto bad; \ |
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| 446 | GETCHAR(citype, p); \ |
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| 447 | GETCHAR(cilen, p); \ |
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| 448 | if (cilen != addrlen || \ |
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| 449 | citype != opt) \ |
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| 450 | goto bad; \ |
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| 451 | GETLONG(l, p); \ |
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| 452 | cilong = htonl(l); \ |
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| 453 | if (val1 != cilong) \ |
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| 454 | goto bad; \ |
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| 455 | if (old) { \ |
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| 456 | GETLONG(l, p); \ |
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| 457 | cilong = htonl(l); \ |
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| 458 | if (val2 != cilong) \ |
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| 459 | goto bad; \ |
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| 460 | } \ |
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| 461 | } |
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| 462 | |
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| 463 | ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr, |
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| 464 | go->old_addrs, go->ouraddr, go->hisaddr); |
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| 465 | |
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| 466 | ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, |
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| 467 | go->maxslotindex, go->cflag); |
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| 468 | |
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| 469 | /* |
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| 470 | * If there are any remaining CIs, then this packet is bad. |
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| 471 | */ |
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| 472 | if (len != 0) |
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| 473 | goto bad; |
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| 474 | return (1); |
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| 475 | |
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| 476 | bad: |
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| 477 | IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!")); |
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| 478 | return (0); |
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| 479 | } |
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| 480 | |
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| 481 | /* |
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| 482 | * ipcp_nakci - Peer has sent a NAK for some of our CIs. |
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| 483 | * This should not modify any state if the Nak is bad |
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| 484 | * or if IPCP is in the OPENED state. |
---|
| 485 | * |
---|
| 486 | * Returns: |
---|
| 487 | * 0 - Nak was bad. |
---|
| 488 | * 1 - Nak was good. |
---|
| 489 | */ |
---|
| 490 | static int |
---|
| 491 | ipcp_nakci(f, p, len) |
---|
| 492 | fsm *f; |
---|
| 493 | u_char *p; |
---|
| 494 | int len; |
---|
| 495 | { |
---|
| 496 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
---|
| 497 | u_char cimaxslotindex, cicflag; |
---|
| 498 | u_char citype, cilen, *next; |
---|
| 499 | u_short cishort; |
---|
| 500 | u_int32_t ciaddr1, ciaddr2, l; |
---|
| 501 | ipcp_options no; /* options we've seen Naks for */ |
---|
| 502 | ipcp_options try; /* options to request next time */ |
---|
| 503 | |
---|
| 504 | BZERO(&no, sizeof(no)); |
---|
| 505 | try = *go; |
---|
| 506 | |
---|
| 507 | /* |
---|
| 508 | * Any Nak'd CIs must be in exactly the same order that we sent. |
---|
| 509 | * Check packet length and CI length at each step. |
---|
| 510 | * If we find any deviations, then this packet is bad. |
---|
| 511 | */ |
---|
| 512 | #define NAKCIADDR(opt, neg, old, code) \ |
---|
| 513 | if (go->neg && \ |
---|
| 514 | len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \ |
---|
| 515 | p[1] == cilen && \ |
---|
| 516 | p[0] == opt) { \ |
---|
| 517 | len -= cilen; \ |
---|
| 518 | INCPTR(2, p); \ |
---|
| 519 | GETLONG(l, p); \ |
---|
| 520 | ciaddr1 = htonl(l); \ |
---|
| 521 | if (old) { \ |
---|
| 522 | GETLONG(l, p); \ |
---|
| 523 | ciaddr2 = htonl(l); \ |
---|
| 524 | no.old_addrs = 1; \ |
---|
| 525 | } else \ |
---|
| 526 | ciaddr2 = 0; \ |
---|
| 527 | no.neg = 1; \ |
---|
| 528 | code \ |
---|
| 529 | } |
---|
| 530 | |
---|
| 531 | #define NAKCIVJ(opt, neg, code) \ |
---|
| 532 | if (go->neg && \ |
---|
| 533 | ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \ |
---|
| 534 | len >= cilen && \ |
---|
| 535 | p[0] == opt) { \ |
---|
| 536 | len -= cilen; \ |
---|
| 537 | INCPTR(2, p); \ |
---|
| 538 | GETSHORT(cishort, p); \ |
---|
| 539 | no.neg = 1; \ |
---|
| 540 | code \ |
---|
| 541 | } |
---|
| 542 | |
---|
| 543 | /* |
---|
| 544 | * Accept the peer's idea of {our,his} address, if different |
---|
| 545 | * from our idea, only if the accept_{local,remote} flag is set. |
---|
| 546 | */ |
---|
| 547 | NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs, |
---|
| 548 | if (go->accept_local && ciaddr1) { /* Do we know our address? */ |
---|
| 549 | try.ouraddr = ciaddr1; |
---|
| 550 | IPCPDEBUG((LOG_INFO, "local IP address %s", |
---|
| 551 | ip_ntoa(ciaddr1))); |
---|
| 552 | } |
---|
| 553 | if (go->accept_remote && ciaddr2) { /* Does he know his? */ |
---|
| 554 | try.hisaddr = ciaddr2; |
---|
| 555 | IPCPDEBUG((LOG_INFO, "remote IP address %s", |
---|
| 556 | ip_ntoa(ciaddr2))); |
---|
| 557 | } |
---|
| 558 | ); |
---|
| 559 | |
---|
| 560 | /* |
---|
| 561 | * Accept the peer's value of maxslotindex provided that it |
---|
| 562 | * is less than what we asked for. Turn off slot-ID compression |
---|
| 563 | * if the peer wants. Send old-style compress-type option if |
---|
| 564 | * the peer wants. |
---|
| 565 | */ |
---|
| 566 | NAKCIVJ(CI_COMPRESSTYPE, neg_vj, |
---|
| 567 | if (cilen == CILEN_VJ) { |
---|
| 568 | GETCHAR(cimaxslotindex, p); |
---|
| 569 | GETCHAR(cicflag, p); |
---|
| 570 | if (cishort == IPCP_VJ_COMP) { |
---|
| 571 | try.old_vj = 0; |
---|
| 572 | if (cimaxslotindex < go->maxslotindex) |
---|
| 573 | try.maxslotindex = cimaxslotindex; |
---|
| 574 | if (!cicflag) |
---|
| 575 | try.cflag = 0; |
---|
| 576 | } else { |
---|
| 577 | try.neg_vj = 0; |
---|
| 578 | } |
---|
| 579 | } else { |
---|
| 580 | if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) { |
---|
| 581 | try.old_vj = 1; |
---|
| 582 | try.vj_protocol = cishort; |
---|
| 583 | } else { |
---|
| 584 | try.neg_vj = 0; |
---|
| 585 | } |
---|
| 586 | } |
---|
| 587 | ); |
---|
| 588 | |
---|
| 589 | /* |
---|
| 590 | * There may be remaining CIs, if the peer is requesting negotiation |
---|
| 591 | * on an option that we didn't include in our request packet. |
---|
| 592 | * If they want to negotiate about IP addresses, we comply. |
---|
| 593 | * If they want us to ask for compression, we refuse. |
---|
| 594 | */ |
---|
| 595 | while (len > CILEN_VOID) { |
---|
| 596 | GETCHAR(citype, p); |
---|
| 597 | GETCHAR(cilen, p); |
---|
| 598 | if( (len -= cilen) < 0 ) |
---|
| 599 | goto bad; |
---|
| 600 | next = p + cilen - 2; |
---|
| 601 | |
---|
| 602 | switch (citype) { |
---|
| 603 | case CI_COMPRESSTYPE: |
---|
| 604 | if (go->neg_vj || no.neg_vj || |
---|
| 605 | (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) |
---|
| 606 | goto bad; |
---|
| 607 | no.neg_vj = 1; |
---|
| 608 | break; |
---|
| 609 | case CI_ADDRS: |
---|
| 610 | if ((go->neg_addr && go->old_addrs) || no.old_addrs |
---|
| 611 | || cilen != CILEN_ADDRS) |
---|
| 612 | goto bad; |
---|
| 613 | try.neg_addr = 1; |
---|
| 614 | try.old_addrs = 1; |
---|
| 615 | GETLONG(l, p); |
---|
| 616 | ciaddr1 = htonl(l); |
---|
| 617 | if (ciaddr1 && go->accept_local) |
---|
| 618 | try.ouraddr = ciaddr1; |
---|
| 619 | GETLONG(l, p); |
---|
| 620 | ciaddr2 = htonl(l); |
---|
| 621 | if (ciaddr2 && go->accept_remote) |
---|
| 622 | try.hisaddr = ciaddr2; |
---|
| 623 | no.old_addrs = 1; |
---|
| 624 | break; |
---|
| 625 | case CI_ADDR: |
---|
| 626 | if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) |
---|
| 627 | goto bad; |
---|
| 628 | try.old_addrs = 0; |
---|
| 629 | GETLONG(l, p); |
---|
| 630 | ciaddr1 = htonl(l); |
---|
| 631 | if (ciaddr1 && go->accept_local) |
---|
| 632 | try.ouraddr = ciaddr1; |
---|
| 633 | if (try.ouraddr != 0) |
---|
| 634 | try.neg_addr = 1; |
---|
| 635 | no.neg_addr = 1; |
---|
| 636 | break; |
---|
| 637 | } |
---|
| 638 | p = next; |
---|
| 639 | } |
---|
| 640 | |
---|
| 641 | /* If there is still anything left, this packet is bad. */ |
---|
| 642 | if (len != 0) |
---|
| 643 | goto bad; |
---|
| 644 | |
---|
| 645 | /* |
---|
| 646 | * OK, the Nak is good. Now we can update state. |
---|
| 647 | */ |
---|
| 648 | if (f->state != OPENED) |
---|
| 649 | *go = try; |
---|
| 650 | |
---|
| 651 | return 1; |
---|
| 652 | |
---|
| 653 | bad: |
---|
| 654 | IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!")); |
---|
| 655 | return 0; |
---|
| 656 | } |
---|
| 657 | |
---|
| 658 | |
---|
| 659 | /* |
---|
| 660 | * ipcp_rejci - Reject some of our CIs. |
---|
| 661 | */ |
---|
| 662 | static int |
---|
| 663 | ipcp_rejci(f, p, len) |
---|
| 664 | fsm *f; |
---|
| 665 | u_char *p; |
---|
| 666 | int len; |
---|
| 667 | { |
---|
| 668 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
---|
| 669 | u_char cimaxslotindex, ciflag, cilen; |
---|
| 670 | u_short cishort; |
---|
| 671 | u_int32_t cilong; |
---|
| 672 | ipcp_options try; /* options to request next time */ |
---|
| 673 | |
---|
| 674 | try = *go; |
---|
| 675 | /* |
---|
| 676 | * Any Rejected CIs must be in exactly the same order that we sent. |
---|
| 677 | * Check packet length and CI length at each step. |
---|
| 678 | * If we find any deviations, then this packet is bad. |
---|
| 679 | */ |
---|
| 680 | #define REJCIADDR(opt, neg, old, val1, val2) \ |
---|
| 681 | if (go->neg && \ |
---|
| 682 | len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \ |
---|
| 683 | p[1] == cilen && \ |
---|
| 684 | p[0] == opt) { \ |
---|
| 685 | u_int32_t l; \ |
---|
| 686 | len -= cilen; \ |
---|
| 687 | INCPTR(2, p); \ |
---|
| 688 | GETLONG(l, p); \ |
---|
| 689 | cilong = htonl(l); \ |
---|
| 690 | /* Check rejected value. */ \ |
---|
| 691 | if (cilong != val1) \ |
---|
| 692 | goto bad; \ |
---|
| 693 | if (old) { \ |
---|
| 694 | GETLONG(l, p); \ |
---|
| 695 | cilong = htonl(l); \ |
---|
| 696 | /* Check rejected value. */ \ |
---|
| 697 | if (cilong != val2) \ |
---|
| 698 | goto bad; \ |
---|
| 699 | } \ |
---|
| 700 | try.neg = 0; \ |
---|
| 701 | } |
---|
| 702 | |
---|
| 703 | #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \ |
---|
| 704 | if (go->neg && \ |
---|
| 705 | p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \ |
---|
| 706 | len >= p[1] && \ |
---|
| 707 | p[0] == opt) { \ |
---|
| 708 | len -= p[1]; \ |
---|
| 709 | INCPTR(2, p); \ |
---|
| 710 | GETSHORT(cishort, p); \ |
---|
| 711 | /* Check rejected value. */ \ |
---|
| 712 | if (cishort != val) \ |
---|
| 713 | goto bad; \ |
---|
| 714 | if (!old) { \ |
---|
| 715 | GETCHAR(cimaxslotindex, p); \ |
---|
| 716 | if (cimaxslotindex != maxslot) \ |
---|
| 717 | goto bad; \ |
---|
| 718 | GETCHAR(ciflag, p); \ |
---|
| 719 | if (ciflag != cflag) \ |
---|
| 720 | goto bad; \ |
---|
| 721 | } \ |
---|
| 722 | try.neg = 0; \ |
---|
| 723 | } |
---|
| 724 | |
---|
| 725 | REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, |
---|
| 726 | go->old_addrs, go->ouraddr, go->hisaddr); |
---|
| 727 | |
---|
| 728 | REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj, |
---|
| 729 | go->maxslotindex, go->cflag); |
---|
| 730 | |
---|
| 731 | /* |
---|
| 732 | * If there are any remaining CIs, then this packet is bad. |
---|
| 733 | */ |
---|
| 734 | if (len != 0) |
---|
| 735 | goto bad; |
---|
| 736 | /* |
---|
| 737 | * Now we can update state. |
---|
| 738 | */ |
---|
| 739 | if (f->state != OPENED) |
---|
| 740 | *go = try; |
---|
| 741 | return 1; |
---|
| 742 | |
---|
| 743 | bad: |
---|
| 744 | IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!")); |
---|
| 745 | return 0; |
---|
| 746 | } |
---|
| 747 | |
---|
| 748 | |
---|
| 749 | /* |
---|
| 750 | * ipcp_reqci - Check the peer's requested CIs and send appropriate response. |
---|
| 751 | * |
---|
| 752 | * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified |
---|
| 753 | * appropriately. If reject_if_disagree is non-zero, doesn't return |
---|
| 754 | * CONFNAK; returns CONFREJ if it can't return CONFACK. |
---|
| 755 | */ |
---|
| 756 | static int |
---|
| 757 | ipcp_reqci(f, inp, len, reject_if_disagree) |
---|
| 758 | fsm *f; |
---|
| 759 | u_char *inp; /* Requested CIs */ |
---|
| 760 | int *len; /* Length of requested CIs */ |
---|
| 761 | int reject_if_disagree; |
---|
| 762 | { |
---|
| 763 | ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
---|
| 764 | ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
---|
| 765 | ipcp_options *ao = &ipcp_allowoptions[f->unit]; |
---|
| 766 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
---|
| 767 | u_char *cip, *next; /* Pointer to current and next CIs */ |
---|
| 768 | u_short cilen, citype; /* Parsed len, type */ |
---|
| 769 | u_short cishort; /* Parsed short value */ |
---|
| 770 | u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */ |
---|
| 771 | int rc = CONFACK; /* Final packet return code */ |
---|
| 772 | int orc; /* Individual option return code */ |
---|
| 773 | u_char *p; /* Pointer to next char to parse */ |
---|
| 774 | u_char *ucp = inp; /* Pointer to current output char */ |
---|
| 775 | int l = *len; /* Length left */ |
---|
| 776 | u_char maxslotindex, cflag; |
---|
| 777 | int d; |
---|
| 778 | |
---|
| 779 | cis_received[f->unit] = 1; |
---|
| 780 | |
---|
| 781 | /* |
---|
| 782 | * Reset all his options. |
---|
| 783 | */ |
---|
| 784 | BZERO(ho, sizeof(*ho)); |
---|
| 785 | |
---|
| 786 | /* |
---|
| 787 | * Process all his options. |
---|
| 788 | */ |
---|
| 789 | next = inp; |
---|
| 790 | while (l) { |
---|
| 791 | orc = CONFACK; /* Assume success */ |
---|
| 792 | cip = p = next; /* Remember begining of CI */ |
---|
| 793 | if (l < 2 || /* Not enough data for CI header or */ |
---|
| 794 | p[1] < 2 || /* CI length too small or */ |
---|
| 795 | p[1] > l) { /* CI length too big? */ |
---|
| 796 | IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!")); |
---|
| 797 | orc = CONFREJ; /* Reject bad CI */ |
---|
| 798 | cilen = l; /* Reject till end of packet */ |
---|
| 799 | l = 0; /* Don't loop again */ |
---|
| 800 | goto endswitch; |
---|
| 801 | } |
---|
| 802 | GETCHAR(citype, p); /* Parse CI type */ |
---|
| 803 | GETCHAR(cilen, p); /* Parse CI length */ |
---|
| 804 | l -= cilen; /* Adjust remaining length */ |
---|
| 805 | next += cilen; /* Step to next CI */ |
---|
| 806 | |
---|
| 807 | switch (citype) { /* Check CI type */ |
---|
| 808 | case CI_ADDRS: |
---|
| 809 | IPCPDEBUG((LOG_INFO, "ipcp: received ADDRS ")); |
---|
| 810 | if (!ao->neg_addr || |
---|
| 811 | cilen != CILEN_ADDRS) { /* Check CI length */ |
---|
| 812 | orc = CONFREJ; /* Reject CI */ |
---|
| 813 | break; |
---|
| 814 | } |
---|
| 815 | |
---|
| 816 | /* |
---|
| 817 | * If he has no address, or if we both have his address but |
---|
| 818 | * disagree about it, then NAK it with our idea. |
---|
| 819 | * In particular, if we don't know his address, but he does, |
---|
| 820 | * then accept it. |
---|
| 821 | */ |
---|
| 822 | GETLONG(tl, p); /* Parse source address (his) */ |
---|
| 823 | ciaddr1 = htonl(tl); |
---|
| 824 | IPCPDEBUG((LOG_INFO, "(%s:", ip_ntoa(ciaddr1))); |
---|
| 825 | if (ciaddr1 != wo->hisaddr |
---|
| 826 | && (ciaddr1 == 0 || !wo->accept_remote)) { |
---|
| 827 | orc = CONFNAK; |
---|
| 828 | if (!reject_if_disagree) { |
---|
| 829 | DECPTR(sizeof(u_int32_t), p); |
---|
| 830 | tl = ntohl(wo->hisaddr); |
---|
| 831 | PUTLONG(tl, p); |
---|
| 832 | } |
---|
| 833 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) { |
---|
| 834 | /* |
---|
| 835 | * If neither we nor he knows his address, reject the option. |
---|
| 836 | */ |
---|
| 837 | orc = CONFREJ; |
---|
| 838 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ |
---|
| 839 | break; |
---|
| 840 | } |
---|
| 841 | |
---|
| 842 | /* |
---|
| 843 | * If he doesn't know our address, or if we both have our address |
---|
| 844 | * but disagree about it, then NAK it with our idea. |
---|
| 845 | */ |
---|
| 846 | GETLONG(tl, p); /* Parse desination address (ours) */ |
---|
| 847 | ciaddr2 = htonl(tl); |
---|
| 848 | IPCPDEBUG((LOG_INFO, "%s)", ip_ntoa(ciaddr2))); |
---|
| 849 | if (ciaddr2 != wo->ouraddr) { |
---|
| 850 | if (ciaddr2 == 0 || !wo->accept_local) { |
---|
| 851 | orc = CONFNAK; |
---|
| 852 | if (!reject_if_disagree) { |
---|
| 853 | DECPTR(sizeof(u_int32_t), p); |
---|
| 854 | tl = ntohl(wo->ouraddr); |
---|
| 855 | PUTLONG(tl, p); |
---|
| 856 | } |
---|
| 857 | } else { |
---|
| 858 | go->ouraddr = ciaddr2; /* accept peer's idea */ |
---|
| 859 | } |
---|
| 860 | } |
---|
| 861 | |
---|
| 862 | ho->neg_addr = 1; |
---|
| 863 | ho->old_addrs = 1; |
---|
| 864 | ho->hisaddr = ciaddr1; |
---|
| 865 | ho->ouraddr = ciaddr2; |
---|
| 866 | break; |
---|
| 867 | |
---|
| 868 | case CI_ADDR: |
---|
| 869 | IPCPDEBUG((LOG_INFO, "ipcp: received ADDR ")); |
---|
| 870 | |
---|
| 871 | if (!ao->neg_addr || |
---|
| 872 | cilen != CILEN_ADDR) { /* Check CI length */ |
---|
| 873 | orc = CONFREJ; /* Reject CI */ |
---|
| 874 | break; |
---|
| 875 | } |
---|
| 876 | |
---|
| 877 | /* |
---|
| 878 | * If he has no address, or if we both have his address but |
---|
| 879 | * disagree about it, then NAK it with our idea. |
---|
| 880 | * In particular, if we don't know his address, but he does, |
---|
| 881 | * then accept it. |
---|
| 882 | */ |
---|
| 883 | GETLONG(tl, p); /* Parse source address (his) */ |
---|
| 884 | ciaddr1 = htonl(tl); |
---|
| 885 | IPCPDEBUG((LOG_INFO, "(%s)", ip_ntoa(ciaddr1))); |
---|
| 886 | if (ciaddr1 != wo->hisaddr |
---|
| 887 | && (ciaddr1 == 0 || !wo->accept_remote)) { |
---|
| 888 | orc = CONFNAK; |
---|
| 889 | if (!reject_if_disagree) { |
---|
| 890 | DECPTR(sizeof(u_int32_t), p); |
---|
| 891 | tl = ntohl(wo->hisaddr); |
---|
| 892 | PUTLONG(tl, p); |
---|
| 893 | } |
---|
| 894 | } else if (ciaddr1 == 0 && wo->hisaddr == 0) { |
---|
| 895 | /* |
---|
| 896 | * Don't ACK an address of 0.0.0.0 - reject it instead. |
---|
| 897 | */ |
---|
| 898 | orc = CONFREJ; |
---|
| 899 | wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ |
---|
| 900 | break; |
---|
| 901 | } |
---|
| 902 | |
---|
| 903 | ho->neg_addr = 1; |
---|
| 904 | ho->hisaddr = ciaddr1; |
---|
| 905 | break; |
---|
| 906 | |
---|
| 907 | case CI_MS_DNS1: |
---|
| 908 | case CI_MS_DNS2: |
---|
| 909 | /* Microsoft primary or secondary DNS request */ |
---|
| 910 | d = citype == CI_MS_DNS2; |
---|
| 911 | IPCPDEBUG((LOG_INFO, "ipcp: received DNS%d Request ", d+1)); |
---|
| 912 | |
---|
| 913 | /* If we do not have a DNS address then we cannot send it */ |
---|
| 914 | if (ao->dnsaddr[d] == 0 || |
---|
| 915 | cilen != CILEN_ADDR) { /* Check CI length */ |
---|
| 916 | orc = CONFREJ; /* Reject CI */ |
---|
| 917 | break; |
---|
| 918 | } |
---|
| 919 | GETLONG(tl, p); |
---|
| 920 | if (htonl(tl) != ao->dnsaddr[d]) { |
---|
| 921 | DECPTR(sizeof(u_int32_t), p); |
---|
| 922 | tl = ntohl(ao->dnsaddr[d]); |
---|
| 923 | PUTLONG(tl, p); |
---|
| 924 | orc = CONFNAK; |
---|
| 925 | } |
---|
| 926 | break; |
---|
| 927 | |
---|
| 928 | case CI_MS_WINS1: |
---|
| 929 | case CI_MS_WINS2: |
---|
| 930 | /* Microsoft primary or secondary WINS request */ |
---|
| 931 | d = citype == CI_MS_WINS2; |
---|
| 932 | IPCPDEBUG((LOG_INFO, "ipcp: received WINS%d Request ", d+1)); |
---|
| 933 | |
---|
| 934 | /* If we do not have a DNS address then we cannot send it */ |
---|
| 935 | if (ao->winsaddr[d] == 0 || |
---|
| 936 | cilen != CILEN_ADDR) { /* Check CI length */ |
---|
| 937 | orc = CONFREJ; /* Reject CI */ |
---|
| 938 | break; |
---|
| 939 | } |
---|
| 940 | GETLONG(tl, p); |
---|
| 941 | if (htonl(tl) != ao->winsaddr[d]) { |
---|
| 942 | DECPTR(sizeof(u_int32_t), p); |
---|
| 943 | tl = ntohl(ao->winsaddr[d]); |
---|
| 944 | PUTLONG(tl, p); |
---|
| 945 | orc = CONFNAK; |
---|
| 946 | } |
---|
| 947 | break; |
---|
| 948 | |
---|
| 949 | case CI_COMPRESSTYPE: |
---|
| 950 | IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE ")); |
---|
| 951 | if (!ao->neg_vj || |
---|
| 952 | (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) { |
---|
| 953 | orc = CONFREJ; |
---|
| 954 | break; |
---|
| 955 | } |
---|
| 956 | GETSHORT(cishort, p); |
---|
| 957 | IPCPDEBUG((LOG_INFO, "(%d)", cishort)); |
---|
| 958 | |
---|
| 959 | if (!(cishort == IPCP_VJ_COMP || |
---|
| 960 | (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) { |
---|
| 961 | orc = CONFREJ; |
---|
| 962 | break; |
---|
| 963 | } |
---|
| 964 | |
---|
| 965 | ho->neg_vj = 1; |
---|
| 966 | ho->vj_protocol = cishort; |
---|
| 967 | if (cilen == CILEN_VJ) { |
---|
| 968 | GETCHAR(maxslotindex, p); |
---|
| 969 | if (maxslotindex > ao->maxslotindex) { |
---|
| 970 | orc = CONFNAK; |
---|
| 971 | if (!reject_if_disagree){ |
---|
| 972 | DECPTR(1, p); |
---|
| 973 | PUTCHAR(ao->maxslotindex, p); |
---|
| 974 | } |
---|
| 975 | } |
---|
| 976 | GETCHAR(cflag, p); |
---|
| 977 | if (cflag && !ao->cflag) { |
---|
| 978 | orc = CONFNAK; |
---|
| 979 | if (!reject_if_disagree){ |
---|
| 980 | DECPTR(1, p); |
---|
| 981 | PUTCHAR(wo->cflag, p); |
---|
| 982 | } |
---|
| 983 | } |
---|
| 984 | ho->maxslotindex = maxslotindex; |
---|
| 985 | ho->cflag = cflag; |
---|
| 986 | } else { |
---|
| 987 | ho->old_vj = 1; |
---|
| 988 | ho->maxslotindex = MAX_STATES - 1; |
---|
| 989 | ho->cflag = 1; |
---|
| 990 | } |
---|
| 991 | break; |
---|
| 992 | |
---|
| 993 | default: |
---|
| 994 | orc = CONFREJ; |
---|
| 995 | break; |
---|
| 996 | } |
---|
| 997 | |
---|
| 998 | endswitch: |
---|
| 999 | IPCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc))); |
---|
| 1000 | |
---|
| 1001 | if (orc == CONFACK && /* Good CI */ |
---|
| 1002 | rc != CONFACK) /* but prior CI wasnt? */ |
---|
| 1003 | continue; /* Don't send this one */ |
---|
| 1004 | |
---|
| 1005 | if (orc == CONFNAK) { /* Nak this CI? */ |
---|
| 1006 | if (reject_if_disagree) /* Getting fed up with sending NAKs? */ |
---|
| 1007 | orc = CONFREJ; /* Get tough if so */ |
---|
| 1008 | else { |
---|
| 1009 | if (rc == CONFREJ) /* Rejecting prior CI? */ |
---|
| 1010 | continue; /* Don't send this one */ |
---|
| 1011 | if (rc == CONFACK) { /* Ack'd all prior CIs? */ |
---|
| 1012 | rc = CONFNAK; /* Not anymore... */ |
---|
| 1013 | ucp = inp; /* Backup */ |
---|
| 1014 | } |
---|
| 1015 | } |
---|
| 1016 | } |
---|
| 1017 | |
---|
| 1018 | if (orc == CONFREJ && /* Reject this CI */ |
---|
| 1019 | rc != CONFREJ) { /* but no prior ones? */ |
---|
| 1020 | rc = CONFREJ; |
---|
| 1021 | ucp = inp; /* Backup */ |
---|
| 1022 | } |
---|
| 1023 | |
---|
| 1024 | /* Need to move CI? */ |
---|
| 1025 | if (ucp != cip) |
---|
| 1026 | BCOPY(cip, ucp, cilen); /* Move it */ |
---|
| 1027 | |
---|
| 1028 | /* Update output pointer */ |
---|
| 1029 | INCPTR(cilen, ucp); |
---|
| 1030 | } |
---|
| 1031 | |
---|
| 1032 | /* |
---|
| 1033 | * If we aren't rejecting this packet, and we want to negotiate |
---|
| 1034 | * their address, and they didn't send their address, then we |
---|
| 1035 | * send a NAK with a CI_ADDR option appended. We assume the |
---|
| 1036 | * input buffer is long enough that we can append the extra |
---|
| 1037 | * option safely. |
---|
| 1038 | */ |
---|
| 1039 | if (rc != CONFREJ && !ho->neg_addr && |
---|
| 1040 | wo->req_addr && !reject_if_disagree) { |
---|
| 1041 | if (rc == CONFACK) { |
---|
| 1042 | rc = CONFNAK; |
---|
| 1043 | ucp = inp; /* reset pointer */ |
---|
| 1044 | wo->req_addr = 0; /* don't ask again */ |
---|
| 1045 | } |
---|
| 1046 | PUTCHAR(CI_ADDR, ucp); |
---|
| 1047 | PUTCHAR(CILEN_ADDR, ucp); |
---|
| 1048 | tl = ntohl(wo->hisaddr); |
---|
| 1049 | PUTLONG(tl, ucp); |
---|
| 1050 | } |
---|
| 1051 | |
---|
| 1052 | *len = ucp - inp; /* Compute output length */ |
---|
| 1053 | IPCPDEBUG((LOG_INFO, "ipcp: returning Configure-%s", CODENAME(rc))); |
---|
| 1054 | return (rc); /* Return final code */ |
---|
| 1055 | } |
---|
| 1056 | |
---|
| 1057 | |
---|
| 1058 | /* |
---|
| 1059 | * ip_check_options - check that any IP-related options are OK, |
---|
| 1060 | * and assign appropriate defaults. |
---|
| 1061 | */ |
---|
| 1062 | static void |
---|
| 1063 | ip_check_options() |
---|
| 1064 | { |
---|
| 1065 | struct hostent *hp; |
---|
| 1066 | u_int32_t local; |
---|
| 1067 | ipcp_options *wo = &ipcp_wantoptions[0]; |
---|
| 1068 | |
---|
| 1069 | /* |
---|
| 1070 | * Default our local IP address based on our hostname. |
---|
| 1071 | * If local IP address already given, don't bother. |
---|
| 1072 | */ |
---|
| 1073 | if (wo->ouraddr == 0 && !disable_defaultip) { |
---|
| 1074 | /* |
---|
| 1075 | * Look up our hostname (possibly with domain name appended) |
---|
| 1076 | * and take the first IP address as our local IP address. |
---|
| 1077 | * If there isn't an IP address for our hostname, too bad. |
---|
| 1078 | */ |
---|
| 1079 | wo->accept_local = 1; /* don't insist on this default value */ |
---|
| 1080 | if ((hp = gethostbyname(hostname)) != NULL) { |
---|
| 1081 | local = *(u_int32_t *)hp->h_addr; |
---|
| 1082 | if (local != 0 && !bad_ip_adrs(local)) |
---|
| 1083 | wo->ouraddr = local; |
---|
| 1084 | } |
---|
| 1085 | } |
---|
| 1086 | |
---|
| 1087 | } |
---|
| 1088 | |
---|
| 1089 | |
---|
| 1090 | /* |
---|
| 1091 | * ip_demand_conf - configure the interface as though |
---|
| 1092 | * IPCP were up, for use with dial-on-demand. |
---|
| 1093 | */ |
---|
| 1094 | static int |
---|
| 1095 | ip_demand_conf(u) |
---|
| 1096 | int u; |
---|
| 1097 | { |
---|
| 1098 | ipcp_options *wo = &ipcp_wantoptions[u]; |
---|
| 1099 | |
---|
| 1100 | if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr))) |
---|
| 1101 | return 0; |
---|
| 1102 | if (!sifup(u)) |
---|
| 1103 | return 0; |
---|
| 1104 | if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) |
---|
| 1105 | return 0; |
---|
| 1106 | if (wo->default_route) |
---|
| 1107 | if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr)) |
---|
| 1108 | default_route_set[u] = 1; |
---|
| 1109 | if (wo->proxy_arp) |
---|
| 1110 | if (sifproxyarp(u, wo->hisaddr)) |
---|
| 1111 | proxy_arp_set[u] = 1; |
---|
| 1112 | |
---|
| 1113 | syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(wo->ouraddr)); |
---|
| 1114 | syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(wo->hisaddr)); |
---|
| 1115 | |
---|
| 1116 | return 1; |
---|
| 1117 | } |
---|
| 1118 | |
---|
| 1119 | |
---|
| 1120 | /* |
---|
| 1121 | * ipcp_up - IPCP has come UP. |
---|
| 1122 | * |
---|
| 1123 | * Configure the IP network interface appropriately and bring it up. |
---|
| 1124 | */ |
---|
| 1125 | #define script_setenv(a,b) |
---|
| 1126 | |
---|
| 1127 | |
---|
| 1128 | static void |
---|
| 1129 | ipcp_up(f) |
---|
| 1130 | fsm *f; |
---|
| 1131 | { |
---|
| 1132 | u_int32_t mask; |
---|
| 1133 | ipcp_options *ho = &ipcp_hisoptions[f->unit]; |
---|
| 1134 | ipcp_options *go = &ipcp_gotoptions[f->unit]; |
---|
| 1135 | ipcp_options *wo = &ipcp_wantoptions[f->unit]; |
---|
| 1136 | |
---|
| 1137 | np_up(f->unit, PPP_IP); |
---|
| 1138 | IPCPDEBUG((LOG_INFO, "ipcp: up")); |
---|
| 1139 | |
---|
| 1140 | /* |
---|
| 1141 | * We must have a non-zero IP address for both ends of the link. |
---|
| 1142 | */ |
---|
| 1143 | if (!ho->neg_addr) |
---|
| 1144 | ho->hisaddr = wo->hisaddr; |
---|
| 1145 | |
---|
| 1146 | if (ho->hisaddr == 0) { |
---|
| 1147 | syslog(LOG_ERR, "Could not determine remote IP address"); |
---|
| 1148 | ipcp_close(f->unit, "Could not determine remote IP address"); |
---|
| 1149 | return; |
---|
| 1150 | } |
---|
| 1151 | if (go->ouraddr == 0) { |
---|
| 1152 | syslog(LOG_ERR, "Could not determine local IP address"); |
---|
| 1153 | ipcp_close(f->unit, "Could not determine local IP address"); |
---|
| 1154 | return; |
---|
| 1155 | } |
---|
| 1156 | /* script_setenv("IPLOCAL", ip_ntoa(go->ouraddr)); |
---|
| 1157 | script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr)); |
---|
| 1158 | */ |
---|
| 1159 | /* |
---|
| 1160 | * Check that the peer is allowed to use the IP address it wants. |
---|
| 1161 | */ |
---|
| 1162 | if (!auth_ip_addr(f->unit, ho->hisaddr)) { |
---|
| 1163 | syslog(LOG_ERR, "Peer is not authorized to use remote address %s", |
---|
| 1164 | ip_ntoa(ho->hisaddr)); |
---|
| 1165 | ipcp_close(f->unit, "Unauthorized remote IP address"); |
---|
| 1166 | return; |
---|
| 1167 | } |
---|
| 1168 | |
---|
| 1169 | /* set tcp compression */ |
---|
| 1170 | sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex); |
---|
| 1171 | |
---|
| 1172 | /* |
---|
| 1173 | * If we are doing dial-on-demand, the interface is already |
---|
| 1174 | * configured, so we put out any saved-up packets, then set the |
---|
| 1175 | * interface to pass IP packets. |
---|
| 1176 | */ |
---|
| 1177 | { |
---|
| 1178 | /* |
---|
| 1179 | * Set IP addresses and (if specified) netmask. |
---|
| 1180 | */ |
---|
| 1181 | mask = GetMask(go->ouraddr); |
---|
| 1182 | |
---|
| 1183 | #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) |
---|
| 1184 | if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { |
---|
| 1185 | IPCPDEBUG((LOG_WARNING, "sifaddr failed")); |
---|
| 1186 | ipcp_close(f->unit, "Interface configuration failed"); |
---|
| 1187 | return; |
---|
| 1188 | } |
---|
| 1189 | #endif |
---|
| 1190 | |
---|
| 1191 | /* bring the interface up for IP */ |
---|
| 1192 | if (!sifup(f->unit)) { |
---|
| 1193 | IPCPDEBUG((LOG_WARNING, "sifup failed")); |
---|
| 1194 | ipcp_close(f->unit, "Interface configuration failed"); |
---|
| 1195 | return; |
---|
| 1196 | } |
---|
| 1197 | |
---|
| 1198 | #if (defined(SVR4) && (defined(SNI) || defined(__USLC__))) |
---|
| 1199 | if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { |
---|
| 1200 | IPCPDEBUG((LOG_WARNING, "sifaddr failed")); |
---|
| 1201 | ipcp_close(f->unit, "Interface configuration failed"); |
---|
| 1202 | return; |
---|
| 1203 | } |
---|
| 1204 | #endif |
---|
| 1205 | sifnpmode(f->unit, PPP_IP, NPMODE_PASS); |
---|
| 1206 | |
---|
| 1207 | /* assign a default route through the interface if required */ |
---|
| 1208 | if (ipcp_wantoptions[f->unit].default_route) |
---|
| 1209 | if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) |
---|
| 1210 | default_route_set[f->unit] = 1; |
---|
| 1211 | |
---|
| 1212 | /* Make a proxy ARP entry if requested. */ |
---|
| 1213 | if (ipcp_wantoptions[f->unit].proxy_arp) |
---|
| 1214 | if (sifproxyarp(f->unit, ho->hisaddr)) |
---|
| 1215 | proxy_arp_set[f->unit] = 1; |
---|
| 1216 | |
---|
| 1217 | syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(go->ouraddr)); |
---|
| 1218 | syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr)); |
---|
| 1219 | } |
---|
| 1220 | |
---|
| 1221 | /* |
---|
| 1222 | * Execute the ip-up script, like this: |
---|
| 1223 | * /etc/ppp/ip-up interface tty speed local-IP remote-IP |
---|
| 1224 | */ |
---|
| 1225 | { |
---|
| 1226 | #if 0 |
---|
| 1227 | /* XXX PPPConfiguration */ |
---|
| 1228 | GlobalSystemStatus *stat; |
---|
| 1229 | stat=LockSTBSystemParam(); |
---|
| 1230 | stat->ConnectionStatus=Connected; |
---|
| 1231 | UnlockSTBSystemParam(); |
---|
| 1232 | #endif |
---|
| 1233 | } |
---|
| 1234 | } |
---|
| 1235 | |
---|
| 1236 | |
---|
| 1237 | /* |
---|
| 1238 | * ipcp_down - IPCP has gone DOWN. |
---|
| 1239 | * |
---|
| 1240 | * Take the IP network interface down, clear its addresses |
---|
| 1241 | * and delete routes through it. |
---|
| 1242 | */ |
---|
| 1243 | static void |
---|
| 1244 | ipcp_down(f) |
---|
| 1245 | fsm *f; |
---|
| 1246 | { |
---|
| 1247 | IPCPDEBUG((LOG_INFO, "ipcp: down")); |
---|
| 1248 | np_down(f->unit, PPP_IP); |
---|
| 1249 | sifvjcomp(f->unit, 0, 0, 0); |
---|
| 1250 | |
---|
| 1251 | /* |
---|
| 1252 | * If we are doing dial-on-demand, set the interface |
---|
| 1253 | * to queue up outgoing packets (for now). |
---|
| 1254 | */ |
---|
| 1255 | sifdown(f->unit); |
---|
| 1256 | ipcp_clear_addrs(f->unit); |
---|
| 1257 | |
---|
| 1258 | /* Execute the ip-down script */ |
---|
| 1259 | { |
---|
| 1260 | #if 0 |
---|
| 1261 | /* XXX PPPConfiguration */ |
---|
| 1262 | GlobalSystemStatus *stat; |
---|
| 1263 | stat=LockSTBSystemParam(); |
---|
| 1264 | stat->ConnectionStatus=NotConnected; |
---|
| 1265 | UnlockSTBSystemParam(); |
---|
| 1266 | #endif |
---|
| 1267 | } |
---|
| 1268 | } |
---|
| 1269 | |
---|
| 1270 | |
---|
| 1271 | /* |
---|
| 1272 | * ipcp_clear_addrs() - clear the interface addresses, routes, |
---|
| 1273 | * proxy arp entries, etc. |
---|
| 1274 | */ |
---|
| 1275 | static void |
---|
| 1276 | ipcp_clear_addrs(unit) |
---|
| 1277 | int unit; |
---|
| 1278 | { |
---|
| 1279 | u_int32_t ouraddr, hisaddr; |
---|
| 1280 | |
---|
| 1281 | ouraddr = ipcp_gotoptions[unit].ouraddr; |
---|
| 1282 | hisaddr = ipcp_hisoptions[unit].hisaddr; |
---|
| 1283 | if (proxy_arp_set[unit]) { |
---|
| 1284 | cifproxyarp(unit, hisaddr); |
---|
| 1285 | proxy_arp_set[unit] = 0; |
---|
| 1286 | } |
---|
| 1287 | if (default_route_set[unit]) { |
---|
| 1288 | cifdefaultroute(unit, ouraddr, hisaddr); |
---|
| 1289 | default_route_set[unit] = 0; |
---|
| 1290 | } |
---|
| 1291 | cifaddr(unit, ouraddr, hisaddr); |
---|
| 1292 | } |
---|
| 1293 | |
---|
| 1294 | |
---|
| 1295 | /* |
---|
| 1296 | * ipcp_finished - possibly shut down the lower layers. |
---|
| 1297 | */ |
---|
| 1298 | static void |
---|
| 1299 | ipcp_finished(f) |
---|
| 1300 | fsm *f; |
---|
| 1301 | { |
---|
| 1302 | np_finished(f->unit, PPP_IP); |
---|
| 1303 | } |
---|
| 1304 | |
---|
| 1305 | |
---|
| 1306 | #if 0 |
---|
| 1307 | /* |
---|
| 1308 | * ipcp_script - Execute a script with arguments |
---|
| 1309 | * interface-name tty-name speed local-IP remote-IP. |
---|
| 1310 | */ |
---|
| 1311 | static void |
---|
| 1312 | ipcp_script(f, script) |
---|
| 1313 | fsm *f; |
---|
| 1314 | char *script; |
---|
| 1315 | { |
---|
| 1316 | char strspeed[32], strlocal[32], strremote[32]; |
---|
| 1317 | char *argv[8]; |
---|
| 1318 | |
---|
| 1319 | sprintf(strspeed, "%d", baud_rate); |
---|
| 1320 | strcpy(strlocal, ip_ntoa(ipcp_gotoptions[f->unit].ouraddr)); |
---|
| 1321 | strcpy(strremote, ip_ntoa(ipcp_hisoptions[f->unit].hisaddr)); |
---|
| 1322 | |
---|
| 1323 | argv[0] = script; |
---|
| 1324 | argv[1] = ifname; |
---|
| 1325 | argv[2] = devnam; |
---|
| 1326 | argv[3] = strspeed; |
---|
| 1327 | argv[4] = strlocal; |
---|
| 1328 | argv[5] = strremote; |
---|
| 1329 | argv[6] = ipparam; |
---|
| 1330 | argv[7] = NULL; |
---|
| 1331 | run_program(script, argv, 0); |
---|
| 1332 | } |
---|
| 1333 | #endif |
---|
| 1334 | |
---|
| 1335 | /* |
---|
| 1336 | * ipcp_printpkt - print the contents of an IPCP packet. |
---|
| 1337 | */ |
---|
| 1338 | static char *ipcp_codenames[] = { |
---|
| 1339 | "ConfReq", "ConfAck", "ConfNak", "ConfRej", |
---|
| 1340 | "TermReq", "TermAck", "CodeRej" |
---|
| 1341 | }; |
---|
| 1342 | |
---|
| 1343 | static int |
---|
| 1344 | ipcp_printpkt(p, plen, printer, arg) |
---|
| 1345 | u_char *p; |
---|
| 1346 | int plen; |
---|
| 1347 | void (*printer) __P((void *, char *, ...)); |
---|
| 1348 | void *arg; |
---|
| 1349 | { |
---|
| 1350 | int code, id, len, olen; |
---|
| 1351 | u_char *pstart, *optend; |
---|
| 1352 | u_short cishort; |
---|
| 1353 | u_int32_t cilong; |
---|
| 1354 | |
---|
| 1355 | if (plen < HEADERLEN) |
---|
| 1356 | return 0; |
---|
| 1357 | pstart = p; |
---|
| 1358 | GETCHAR(code, p); |
---|
| 1359 | GETCHAR(id, p); |
---|
| 1360 | GETSHORT(len, p); |
---|
| 1361 | if (len < HEADERLEN || len > plen) |
---|
| 1362 | return 0; |
---|
| 1363 | |
---|
| 1364 | if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *)) |
---|
| 1365 | printer(arg, " %s", ipcp_codenames[code-1]); |
---|
| 1366 | else |
---|
| 1367 | printer(arg, " code=0x%x", code); |
---|
| 1368 | printer(arg, " id=0x%x", id); |
---|
| 1369 | len -= HEADERLEN; |
---|
| 1370 | switch (code) { |
---|
| 1371 | case CONFREQ: |
---|
| 1372 | case CONFACK: |
---|
| 1373 | case CONFNAK: |
---|
| 1374 | case CONFREJ: |
---|
| 1375 | |
---|
| 1376 | while (len >= 2) { |
---|
| 1377 | GETCHAR(code, p); |
---|
| 1378 | GETCHAR(olen, p); |
---|
| 1379 | p -= 2; |
---|
| 1380 | if (olen < 2 || olen > len) { |
---|
| 1381 | break; |
---|
| 1382 | } |
---|
| 1383 | printer(arg, " <"); |
---|
| 1384 | len -= olen; |
---|
| 1385 | optend = p + olen; |
---|
| 1386 | switch (code) { |
---|
| 1387 | case CI_ADDRS: |
---|
| 1388 | if (olen == CILEN_ADDRS) { |
---|
| 1389 | p += 2; |
---|
| 1390 | GETLONG(cilong, p); |
---|
| 1391 | printer(arg, "addrs %I", htonl(cilong)); |
---|
| 1392 | GETLONG(cilong, p); |
---|
| 1393 | printer(arg, " %I", htonl(cilong)); |
---|
| 1394 | } |
---|
| 1395 | break; |
---|
| 1396 | case CI_COMPRESSTYPE: |
---|
| 1397 | if (olen >= CILEN_COMPRESS) { |
---|
| 1398 | p += 2; |
---|
| 1399 | GETSHORT(cishort, p); |
---|
| 1400 | printer(arg, "compress "); |
---|
| 1401 | switch (cishort) { |
---|
| 1402 | case IPCP_VJ_COMP: |
---|
| 1403 | printer(arg, "VJ"); |
---|
| 1404 | break; |
---|
| 1405 | case IPCP_VJ_COMP_OLD: |
---|
| 1406 | printer(arg, "old-VJ"); |
---|
| 1407 | break; |
---|
| 1408 | default: |
---|
| 1409 | printer(arg, "0x%x", cishort); |
---|
| 1410 | } |
---|
| 1411 | } |
---|
| 1412 | break; |
---|
| 1413 | case CI_ADDR: |
---|
| 1414 | if (olen == CILEN_ADDR) { |
---|
| 1415 | p += 2; |
---|
| 1416 | GETLONG(cilong, p); |
---|
| 1417 | printer(arg, "addr %I", htonl(cilong)); |
---|
| 1418 | } |
---|
| 1419 | break; |
---|
| 1420 | case CI_MS_DNS1: |
---|
| 1421 | case CI_MS_DNS2: |
---|
| 1422 | p += 2; |
---|
| 1423 | GETLONG(cilong, p); |
---|
| 1424 | printer(arg, "ms-dns %I", htonl(cilong)); |
---|
| 1425 | break; |
---|
| 1426 | case CI_MS_WINS1: |
---|
| 1427 | case CI_MS_WINS2: |
---|
| 1428 | p += 2; |
---|
| 1429 | GETLONG(cilong, p); |
---|
| 1430 | printer(arg, "ms-wins %I", htonl(cilong)); |
---|
| 1431 | break; |
---|
| 1432 | } |
---|
| 1433 | while (p < optend) { |
---|
| 1434 | GETCHAR(code, p); |
---|
| 1435 | printer(arg, " %.2x", code); |
---|
| 1436 | } |
---|
| 1437 | printer(arg, ">"); |
---|
| 1438 | } |
---|
| 1439 | break; |
---|
| 1440 | |
---|
| 1441 | case TERMACK: |
---|
| 1442 | case TERMREQ: |
---|
| 1443 | if (len > 0 && *p >= ' ' && *p < 0x7f) { |
---|
| 1444 | printer(arg, " "); |
---|
| 1445 | print_string(p, len, printer, arg); |
---|
| 1446 | p += len; |
---|
| 1447 | len = 0; |
---|
| 1448 | } |
---|
| 1449 | break; |
---|
| 1450 | } |
---|
| 1451 | |
---|
| 1452 | for (; len > 0; --len) { |
---|
| 1453 | GETCHAR(code, p); |
---|
| 1454 | printer(arg, " %.2x", code); |
---|
| 1455 | } |
---|
| 1456 | |
---|
| 1457 | return p - pstart; |
---|
| 1458 | } |
---|
| 1459 | |
---|
| 1460 | /* |
---|
| 1461 | * ip_active_pkt - see if this IP packet is worth bringing the link up for. |
---|
| 1462 | * We don't bring the link up for IP fragments or for TCP FIN packets |
---|
| 1463 | * with no data. |
---|
| 1464 | */ |
---|
| 1465 | #define IP_HDRLEN 20 /* bytes */ |
---|
| 1466 | #define IP_OFFMASK 0x1fff |
---|
| 1467 | #define IPPROTO_TCP 6 |
---|
| 1468 | #define TCP_HDRLEN 20 |
---|
| 1469 | #define TH_FIN 0x01 |
---|
| 1470 | |
---|
| 1471 | /* |
---|
| 1472 | * We use these macros because the IP header may be at an odd address, |
---|
| 1473 | * and some compilers might use word loads to get th_off or ip_hl. |
---|
| 1474 | */ |
---|
| 1475 | |
---|
| 1476 | #define net_short(x) (((x)[0] << 8) + (x)[1]) |
---|
| 1477 | #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF) |
---|
| 1478 | #define get_ipoff(x) net_short((unsigned char *)(x) + 6) |
---|
| 1479 | #define get_ipproto(x) (((unsigned char *)(x))[9]) |
---|
| 1480 | #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) |
---|
| 1481 | #define get_tcpflags(x) (((unsigned char *)(x))[13]) |
---|
| 1482 | |
---|
| 1483 | static int |
---|
| 1484 | ip_active_pkt(pkt, len) |
---|
| 1485 | u_char *pkt; |
---|
| 1486 | int len; |
---|
| 1487 | { |
---|
| 1488 | u_char *tcp; |
---|
| 1489 | int hlen; |
---|
| 1490 | |
---|
| 1491 | len -= PPP_HDRLEN; |
---|
| 1492 | pkt += PPP_HDRLEN; |
---|
| 1493 | if (len < IP_HDRLEN) |
---|
| 1494 | return 0; |
---|
| 1495 | if ((get_ipoff(pkt) & IP_OFFMASK) != 0) |
---|
| 1496 | return 0; |
---|
| 1497 | if (get_ipproto(pkt) != IPPROTO_TCP) |
---|
| 1498 | return 1; |
---|
| 1499 | hlen = get_iphl(pkt) * 4; |
---|
| 1500 | if (len < hlen + TCP_HDRLEN) |
---|
| 1501 | return 0; |
---|
| 1502 | tcp = pkt + hlen; |
---|
| 1503 | if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) |
---|
| 1504 | return 0; |
---|
| 1505 | return 1; |
---|
| 1506 | } |
---|