[d0950ad] | 1 | /* |
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| 2 | * ccp.c - PPP Compression Control Protocol. |
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| 3 | * |
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| 4 | * Copyright (c) 1994 The Australian National University. |
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| 5 | * All rights reserved. |
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| 6 | * |
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| 7 | * Permission to use, copy, modify, and distribute this software and its |
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| 8 | * documentation is hereby granted, provided that the above copyright |
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| 9 | * notice appears in all copies. This software is provided without any |
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| 10 | * warranty, express or implied. The Australian National University |
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| 11 | * makes no representations about the suitability of this software for |
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| 12 | * any purpose. |
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| 13 | * |
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| 14 | * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY |
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| 15 | * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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| 16 | * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF |
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| 17 | * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY |
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| 18 | * OF SUCH DAMAGE. |
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| 19 | * |
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| 20 | * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, |
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| 21 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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| 22 | * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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| 23 | * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO |
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| 24 | * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, |
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| 25 | * OR MODIFICATIONS. |
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| 26 | */ |
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| 27 | |
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[2f1b930] | 28 | #define RCSID "$Id$" |
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[d0950ad] | 29 | |
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[2f1b930] | 30 | #include <stdlib.h> |
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[d0950ad] | 31 | #include <string.h> |
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| 32 | |
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| 33 | #include "pppd.h" |
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| 34 | #include "fsm.h" |
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| 35 | #include "ccp.h" |
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| 36 | #include <net/ppp-comp.h> |
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| 37 | |
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[2f1b930] | 38 | static const char rcsid[] = RCSID; |
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| 39 | |
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| 40 | /* |
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| 41 | * Command-line options. |
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| 42 | */ |
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| 43 | static int setbsdcomp __P((char **)); |
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| 44 | static int setdeflate __P((char **)); |
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| 45 | |
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| 46 | static option_t ccp_option_list[] = { |
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| 47 | { "noccp", o_bool, &ccp_protent.enabled_flag, |
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| 48 | "Disable CCP negotiation" }, |
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| 49 | { "-ccp", o_bool, &ccp_protent.enabled_flag, |
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| 50 | "Disable CCP negotiation" }, |
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| 51 | { "bsdcomp", o_special, setbsdcomp, |
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| 52 | "Request BSD-Compress packet compression" }, |
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| 53 | { "nobsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress, |
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| 54 | "don't allow BSD-Compress", OPT_A2COPY, |
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| 55 | &ccp_allowoptions[0].bsd_compress }, |
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| 56 | { "-bsdcomp", o_bool, &ccp_wantoptions[0].bsd_compress, |
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| 57 | "don't allow BSD-Compress", OPT_A2COPY, |
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| 58 | &ccp_allowoptions[0].bsd_compress }, |
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| 59 | { "deflate", 1, setdeflate, |
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| 60 | "request Deflate compression" }, |
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| 61 | { "nodeflate", o_bool, &ccp_wantoptions[0].deflate, |
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| 62 | "don't allow Deflate compression", OPT_A2COPY, |
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| 63 | &ccp_allowoptions[0].deflate }, |
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| 64 | { "-deflate", o_bool, &ccp_wantoptions[0].deflate, |
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| 65 | "don't allow Deflate compression", OPT_A2COPY, |
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| 66 | &ccp_allowoptions[0].deflate }, |
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| 67 | { "nodeflatedraft", o_bool, &ccp_wantoptions[0].deflate_draft, |
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| 68 | "don't use draft deflate #", OPT_A2COPY, |
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| 69 | &ccp_allowoptions[0].deflate_draft }, |
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| 70 | { "predictor1", o_bool, &ccp_wantoptions[0].predictor_1, |
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| 71 | "request Predictor-1", 1, &ccp_allowoptions[0].predictor_1 }, |
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| 72 | { "nopredictor1", o_bool, &ccp_wantoptions[0].predictor_1, |
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| 73 | "don't allow Predictor-1", OPT_A2COPY, |
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| 74 | &ccp_allowoptions[0].predictor_1 }, |
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| 75 | { "-predictor1", o_bool, &ccp_wantoptions[0].predictor_1, |
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| 76 | "don't allow Predictor-1", OPT_A2COPY, |
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| 77 | &ccp_allowoptions[0].predictor_1 }, |
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| 78 | |
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| 79 | { NULL } |
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| 80 | }; |
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| 81 | |
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[d0950ad] | 82 | /* |
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| 83 | * Protocol entry points from main code. |
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| 84 | */ |
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| 85 | static void ccp_init __P((int unit)); |
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| 86 | static void ccp_open __P((int unit)); |
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| 87 | static void ccp_close __P((int unit, char *)); |
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| 88 | static void ccp_lowerup __P((int unit)); |
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| 89 | static void ccp_lowerdown __P((int)); |
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| 90 | static void ccp_input __P((int unit, u_char *pkt, int len)); |
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| 91 | static void ccp_protrej __P((int unit)); |
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| 92 | static int ccp_printpkt __P((u_char *pkt, int len, |
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| 93 | void (*printer) __P((void *, char *, ...)), |
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| 94 | void *arg)); |
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| 95 | static void ccp_datainput __P((int unit, u_char *pkt, int len)); |
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| 96 | |
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| 97 | struct protent ccp_protent = { |
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| 98 | PPP_CCP, |
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| 99 | ccp_init, |
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| 100 | ccp_input, |
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| 101 | ccp_protrej, |
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| 102 | ccp_lowerup, |
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| 103 | ccp_lowerdown, |
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| 104 | ccp_open, |
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| 105 | ccp_close, |
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| 106 | ccp_printpkt, |
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| 107 | ccp_datainput, |
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| 108 | 1, |
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| 109 | "CCP", |
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[2f1b930] | 110 | "Compressed", |
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| 111 | ccp_option_list, |
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[d0950ad] | 112 | NULL, |
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| 113 | NULL, |
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| 114 | NULL |
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| 115 | }; |
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| 116 | |
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| 117 | fsm ccp_fsm[NUM_PPP]; |
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| 118 | ccp_options ccp_wantoptions[NUM_PPP]; /* what to request the peer to use */ |
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| 119 | ccp_options ccp_gotoptions[NUM_PPP]; /* what the peer agreed to do */ |
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| 120 | ccp_options ccp_allowoptions[NUM_PPP]; /* what we'll agree to do */ |
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| 121 | ccp_options ccp_hisoptions[NUM_PPP]; /* what we agreed to do */ |
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| 122 | |
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| 123 | /* |
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| 124 | * Callbacks for fsm code. |
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| 125 | */ |
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| 126 | static void ccp_resetci __P((fsm *)); |
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| 127 | static int ccp_cilen __P((fsm *)); |
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| 128 | static void ccp_addci __P((fsm *, u_char *, int *)); |
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| 129 | static int ccp_ackci __P((fsm *, u_char *, int)); |
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| 130 | static int ccp_nakci __P((fsm *, u_char *, int)); |
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| 131 | static int ccp_rejci __P((fsm *, u_char *, int)); |
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| 132 | static int ccp_reqci __P((fsm *, u_char *, int *, int)); |
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| 133 | static void ccp_up __P((fsm *)); |
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| 134 | static void ccp_down __P((fsm *)); |
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| 135 | static int ccp_extcode __P((fsm *, int, int, u_char *, int)); |
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| 136 | static void ccp_rack_timeout __P((void *)); |
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| 137 | static char *method_name __P((ccp_options *, ccp_options *)); |
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| 138 | |
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| 139 | static fsm_callbacks ccp_callbacks = { |
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| 140 | ccp_resetci, |
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| 141 | ccp_cilen, |
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| 142 | ccp_addci, |
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| 143 | ccp_ackci, |
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| 144 | ccp_nakci, |
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| 145 | ccp_rejci, |
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| 146 | ccp_reqci, |
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| 147 | ccp_up, |
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| 148 | ccp_down, |
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| 149 | NULL, |
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| 150 | NULL, |
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| 151 | NULL, |
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| 152 | NULL, |
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| 153 | ccp_extcode, |
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| 154 | "CCP" |
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| 155 | }; |
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| 156 | |
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| 157 | /* |
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| 158 | * Do we want / did we get any compression? |
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| 159 | */ |
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| 160 | #define ANY_COMPRESS(opt) ((opt).deflate || (opt).bsd_compress \ |
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| 161 | || (opt).predictor_1 || (opt).predictor_2) |
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| 162 | |
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| 163 | /* |
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| 164 | * Local state (mainly for handling reset-reqs and reset-acks). |
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| 165 | */ |
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| 166 | static int ccp_localstate[NUM_PPP]; |
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| 167 | #define RACK_PENDING 1 /* waiting for reset-ack */ |
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| 168 | #define RREQ_REPEAT 2 /* send another reset-req if no reset-ack */ |
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| 169 | |
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| 170 | #define RACKTIMEOUT 1 /* second */ |
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| 171 | |
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| 172 | static int all_rejected[NUM_PPP]; /* we rejected all peer's options */ |
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| 173 | |
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[2f1b930] | 174 | /* |
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| 175 | * Option parsing. |
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| 176 | */ |
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| 177 | static int |
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| 178 | setbsdcomp(argv) |
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| 179 | char **argv; |
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| 180 | { |
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| 181 | int rbits, abits; |
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| 182 | char *str, *endp; |
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| 183 | |
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| 184 | str = *argv; |
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| 185 | abits = rbits = strtol(str, &endp, 0); |
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| 186 | if (endp != str && *endp == ',') { |
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| 187 | str = endp + 1; |
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| 188 | abits = strtol(str, &endp, 0); |
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| 189 | } |
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| 190 | if (*endp != 0 || endp == str) { |
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| 191 | option_error("invalid parameter '%s' for bsdcomp option", *argv); |
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| 192 | return 0; |
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| 193 | } |
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| 194 | if ((rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS)) |
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| 195 | || (abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS))) { |
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| 196 | option_error("bsdcomp option values must be 0 or %d .. %d", |
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| 197 | BSD_MIN_BITS, BSD_MAX_BITS); |
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| 198 | return 0; |
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| 199 | } |
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| 200 | if (rbits > 0) { |
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| 201 | ccp_wantoptions[0].bsd_compress = 1; |
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| 202 | ccp_wantoptions[0].bsd_bits = rbits; |
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| 203 | } else |
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| 204 | ccp_wantoptions[0].bsd_compress = 0; |
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| 205 | if (abits > 0) { |
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| 206 | ccp_allowoptions[0].bsd_compress = 1; |
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| 207 | ccp_allowoptions[0].bsd_bits = abits; |
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| 208 | } else |
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| 209 | ccp_allowoptions[0].bsd_compress = 0; |
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| 210 | return 1; |
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| 211 | } |
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| 212 | |
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| 213 | static int |
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| 214 | setdeflate(argv) |
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| 215 | char **argv; |
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| 216 | { |
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| 217 | int rbits, abits; |
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| 218 | char *str, *endp; |
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| 219 | |
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| 220 | str = *argv; |
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| 221 | abits = rbits = strtol(str, &endp, 0); |
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| 222 | if (endp != str && *endp == ',') { |
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| 223 | str = endp + 1; |
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| 224 | abits = strtol(str, &endp, 0); |
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| 225 | } |
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| 226 | if (*endp != 0 || endp == str) { |
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| 227 | option_error("invalid parameter '%s' for deflate option", *argv); |
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| 228 | return 0; |
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| 229 | } |
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| 230 | if ((rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE)) |
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| 231 | || (abits != 0 && (abits < DEFLATE_MIN_SIZE |
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| 232 | || abits > DEFLATE_MAX_SIZE))) { |
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| 233 | option_error("deflate option values must be 0 or %d .. %d", |
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| 234 | DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE); |
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| 235 | return 0; |
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| 236 | } |
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| 237 | if (rbits > 0) { |
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| 238 | ccp_wantoptions[0].deflate = 1; |
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| 239 | ccp_wantoptions[0].deflate_size = rbits; |
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| 240 | } else |
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| 241 | ccp_wantoptions[0].deflate = 0; |
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| 242 | if (abits > 0) { |
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| 243 | ccp_allowoptions[0].deflate = 1; |
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| 244 | ccp_allowoptions[0].deflate_size = abits; |
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| 245 | } else |
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| 246 | ccp_allowoptions[0].deflate = 0; |
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| 247 | return 1; |
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| 248 | } |
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| 249 | |
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| 250 | |
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[d0950ad] | 251 | /* |
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| 252 | * ccp_init - initialize CCP. |
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| 253 | */ |
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| 254 | static void |
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| 255 | ccp_init(unit) |
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| 256 | int unit; |
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| 257 | { |
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| 258 | fsm *f = &ccp_fsm[unit]; |
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| 259 | |
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| 260 | f->unit = unit; |
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| 261 | f->protocol = PPP_CCP; |
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| 262 | f->callbacks = &ccp_callbacks; |
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| 263 | fsm_init(f); |
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| 264 | |
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| 265 | memset(&ccp_wantoptions[unit], 0, sizeof(ccp_options)); |
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| 266 | memset(&ccp_gotoptions[unit], 0, sizeof(ccp_options)); |
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| 267 | memset(&ccp_allowoptions[unit], 0, sizeof(ccp_options)); |
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| 268 | memset(&ccp_hisoptions[unit], 0, sizeof(ccp_options)); |
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| 269 | |
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| 270 | ccp_wantoptions[0].deflate = 1; |
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| 271 | ccp_wantoptions[0].deflate_size = DEFLATE_MAX_SIZE; |
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| 272 | ccp_wantoptions[0].deflate_correct = 1; |
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| 273 | ccp_wantoptions[0].deflate_draft = 1; |
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| 274 | ccp_allowoptions[0].deflate = 1; |
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| 275 | ccp_allowoptions[0].deflate_size = DEFLATE_MAX_SIZE; |
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| 276 | ccp_allowoptions[0].deflate_correct = 1; |
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| 277 | ccp_allowoptions[0].deflate_draft = 1; |
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| 278 | |
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| 279 | ccp_wantoptions[0].bsd_compress = 1; |
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| 280 | ccp_wantoptions[0].bsd_bits = BSD_MAX_BITS; |
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| 281 | ccp_allowoptions[0].bsd_compress = 1; |
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| 282 | ccp_allowoptions[0].bsd_bits = BSD_MAX_BITS; |
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| 283 | |
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| 284 | ccp_allowoptions[0].predictor_1 = 1; |
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| 285 | } |
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| 286 | |
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| 287 | /* |
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| 288 | * ccp_open - CCP is allowed to come up. |
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| 289 | */ |
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| 290 | static void |
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| 291 | ccp_open(unit) |
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| 292 | int unit; |
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| 293 | { |
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| 294 | fsm *f = &ccp_fsm[unit]; |
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| 295 | |
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| 296 | if (f->state != OPENED) |
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| 297 | ccp_flags_set(unit, 1, 0); |
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| 298 | |
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| 299 | /* |
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| 300 | * Find out which compressors the kernel supports before |
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| 301 | * deciding whether to open in silent mode. |
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| 302 | */ |
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| 303 | ccp_resetci(f); |
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| 304 | if (!ANY_COMPRESS(ccp_gotoptions[unit])) |
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| 305 | f->flags |= OPT_SILENT; |
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| 306 | |
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| 307 | fsm_open(f); |
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| 308 | } |
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| 309 | |
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| 310 | /* |
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| 311 | * ccp_close - Terminate CCP. |
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| 312 | */ |
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| 313 | static void |
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| 314 | ccp_close(unit, reason) |
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| 315 | int unit; |
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| 316 | char *reason; |
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| 317 | { |
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| 318 | ccp_flags_set(unit, 0, 0); |
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| 319 | fsm_close(&ccp_fsm[unit], reason); |
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| 320 | } |
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| 321 | |
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| 322 | /* |
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| 323 | * ccp_lowerup - we may now transmit CCP packets. |
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| 324 | */ |
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| 325 | static void |
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| 326 | ccp_lowerup(unit) |
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| 327 | int unit; |
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| 328 | { |
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| 329 | fsm_lowerup(&ccp_fsm[unit]); |
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| 330 | } |
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| 331 | |
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| 332 | /* |
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| 333 | * ccp_lowerdown - we may not transmit CCP packets. |
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| 334 | */ |
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| 335 | static void |
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| 336 | ccp_lowerdown(unit) |
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| 337 | int unit; |
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| 338 | { |
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| 339 | fsm_lowerdown(&ccp_fsm[unit]); |
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| 340 | } |
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| 341 | |
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| 342 | /* |
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| 343 | * ccp_input - process a received CCP packet. |
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| 344 | */ |
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| 345 | static void |
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| 346 | ccp_input(unit, p, len) |
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| 347 | int unit; |
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| 348 | u_char *p; |
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| 349 | int len; |
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| 350 | { |
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| 351 | fsm *f = &ccp_fsm[unit]; |
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| 352 | int oldstate; |
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| 353 | |
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| 354 | /* |
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| 355 | * Check for a terminate-request so we can print a message. |
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| 356 | */ |
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| 357 | oldstate = f->state; |
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| 358 | fsm_input(f, p, len); |
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[2f1b930] | 359 | if (oldstate == OPENED && p[0] == TERMREQ && f->state != OPENED) |
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| 360 | notice("Compression disabled by peer."); |
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[d0950ad] | 361 | |
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| 362 | /* |
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| 363 | * If we get a terminate-ack and we're not asking for compression, |
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| 364 | * close CCP. |
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| 365 | */ |
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| 366 | if (oldstate == REQSENT && p[0] == TERMACK |
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| 367 | && !ANY_COMPRESS(ccp_gotoptions[unit])) |
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| 368 | ccp_close(unit, "No compression negotiated"); |
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| 369 | } |
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| 370 | |
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| 371 | /* |
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| 372 | * Handle a CCP-specific code. |
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| 373 | */ |
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| 374 | static int |
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| 375 | ccp_extcode(f, code, id, p, len) |
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| 376 | fsm *f; |
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| 377 | int code, id; |
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| 378 | u_char *p; |
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| 379 | int len; |
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| 380 | { |
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| 381 | switch (code) { |
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| 382 | case CCP_RESETREQ: |
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| 383 | if (f->state != OPENED) |
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| 384 | break; |
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| 385 | /* send a reset-ack, which the transmitter will see and |
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| 386 | reset its compression state. */ |
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| 387 | fsm_sdata(f, CCP_RESETACK, id, NULL, 0); |
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| 388 | break; |
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| 389 | |
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| 390 | case CCP_RESETACK: |
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| 391 | if (ccp_localstate[f->unit] & RACK_PENDING && id == f->reqid) { |
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| 392 | ccp_localstate[f->unit] &= ~(RACK_PENDING | RREQ_REPEAT); |
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| 393 | UNTIMEOUT(ccp_rack_timeout, f); |
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| 394 | } |
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| 395 | break; |
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| 396 | |
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| 397 | default: |
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| 398 | return 0; |
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| 399 | } |
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| 400 | |
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| 401 | return 1; |
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| 402 | } |
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| 403 | |
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| 404 | /* |
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| 405 | * ccp_protrej - peer doesn't talk CCP. |
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| 406 | */ |
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| 407 | static void |
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| 408 | ccp_protrej(unit) |
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| 409 | int unit; |
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| 410 | { |
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| 411 | ccp_flags_set(unit, 0, 0); |
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| 412 | fsm_lowerdown(&ccp_fsm[unit]); |
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| 413 | } |
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| 414 | |
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| 415 | /* |
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| 416 | * ccp_resetci - initialize at start of negotiation. |
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| 417 | */ |
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| 418 | static void |
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| 419 | ccp_resetci(f) |
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| 420 | fsm *f; |
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| 421 | { |
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| 422 | ccp_options *go = &ccp_gotoptions[f->unit]; |
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| 423 | u_char opt_buf[16]; |
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| 424 | |
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| 425 | *go = ccp_wantoptions[f->unit]; |
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| 426 | all_rejected[f->unit] = 0; |
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| 427 | |
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| 428 | /* |
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| 429 | * Check whether the kernel knows about the various |
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| 430 | * compression methods we might request. |
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| 431 | */ |
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| 432 | if (go->bsd_compress) { |
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| 433 | opt_buf[0] = CI_BSD_COMPRESS; |
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| 434 | opt_buf[1] = CILEN_BSD_COMPRESS; |
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| 435 | opt_buf[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, BSD_MIN_BITS); |
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| 436 | if (ccp_test(f->unit, opt_buf, CILEN_BSD_COMPRESS, 0) <= 0) |
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| 437 | go->bsd_compress = 0; |
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| 438 | } |
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| 439 | if (go->deflate) { |
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| 440 | if (go->deflate_correct) { |
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| 441 | opt_buf[0] = CI_DEFLATE; |
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| 442 | opt_buf[1] = CILEN_DEFLATE; |
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| 443 | opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_SIZE); |
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| 444 | opt_buf[3] = DEFLATE_CHK_SEQUENCE; |
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| 445 | if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0) |
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| 446 | go->deflate_correct = 0; |
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| 447 | } |
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| 448 | if (go->deflate_draft) { |
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| 449 | opt_buf[0] = CI_DEFLATE_DRAFT; |
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| 450 | opt_buf[1] = CILEN_DEFLATE; |
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| 451 | opt_buf[2] = DEFLATE_MAKE_OPT(DEFLATE_MIN_SIZE); |
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| 452 | opt_buf[3] = DEFLATE_CHK_SEQUENCE; |
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| 453 | if (ccp_test(f->unit, opt_buf, CILEN_DEFLATE, 0) <= 0) |
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| 454 | go->deflate_draft = 0; |
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| 455 | } |
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| 456 | if (!go->deflate_correct && !go->deflate_draft) |
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| 457 | go->deflate = 0; |
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| 458 | } |
---|
| 459 | if (go->predictor_1) { |
---|
| 460 | opt_buf[0] = CI_PREDICTOR_1; |
---|
| 461 | opt_buf[1] = CILEN_PREDICTOR_1; |
---|
| 462 | if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_1, 0) <= 0) |
---|
| 463 | go->predictor_1 = 0; |
---|
| 464 | } |
---|
| 465 | if (go->predictor_2) { |
---|
| 466 | opt_buf[0] = CI_PREDICTOR_2; |
---|
| 467 | opt_buf[1] = CILEN_PREDICTOR_2; |
---|
| 468 | if (ccp_test(f->unit, opt_buf, CILEN_PREDICTOR_2, 0) <= 0) |
---|
| 469 | go->predictor_2 = 0; |
---|
| 470 | } |
---|
| 471 | } |
---|
| 472 | |
---|
| 473 | /* |
---|
| 474 | * ccp_cilen - Return total length of our configuration info. |
---|
| 475 | */ |
---|
| 476 | static int |
---|
| 477 | ccp_cilen(f) |
---|
| 478 | fsm *f; |
---|
| 479 | { |
---|
| 480 | ccp_options *go = &ccp_gotoptions[f->unit]; |
---|
| 481 | |
---|
| 482 | return (go->bsd_compress? CILEN_BSD_COMPRESS: 0) |
---|
| 483 | + (go->deflate? CILEN_DEFLATE: 0) |
---|
| 484 | + (go->predictor_1? CILEN_PREDICTOR_1: 0) |
---|
| 485 | + (go->predictor_2? CILEN_PREDICTOR_2: 0); |
---|
| 486 | } |
---|
| 487 | |
---|
| 488 | /* |
---|
| 489 | * ccp_addci - put our requests in a packet. |
---|
| 490 | */ |
---|
| 491 | static void |
---|
| 492 | ccp_addci(f, p, lenp) |
---|
| 493 | fsm *f; |
---|
| 494 | u_char *p; |
---|
| 495 | int *lenp; |
---|
| 496 | { |
---|
| 497 | int res; |
---|
| 498 | ccp_options *go = &ccp_gotoptions[f->unit]; |
---|
| 499 | u_char *p0 = p; |
---|
| 500 | |
---|
| 501 | /* |
---|
| 502 | * Add the compression types that we can receive, in decreasing |
---|
| 503 | * preference order. Get the kernel to allocate the first one |
---|
| 504 | * in case it gets Acked. |
---|
| 505 | */ |
---|
| 506 | if (go->deflate) { |
---|
| 507 | p[0] = go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT; |
---|
| 508 | p[1] = CILEN_DEFLATE; |
---|
| 509 | p[2] = DEFLATE_MAKE_OPT(go->deflate_size); |
---|
| 510 | p[3] = DEFLATE_CHK_SEQUENCE; |
---|
| 511 | for (;;) { |
---|
| 512 | res = ccp_test(f->unit, p, CILEN_DEFLATE, 0); |
---|
| 513 | if (res > 0) { |
---|
| 514 | p += CILEN_DEFLATE; |
---|
| 515 | break; |
---|
| 516 | } |
---|
| 517 | if (res < 0 || go->deflate_size <= DEFLATE_MIN_SIZE) { |
---|
| 518 | go->deflate = 0; |
---|
| 519 | break; |
---|
| 520 | } |
---|
| 521 | --go->deflate_size; |
---|
| 522 | p[2] = DEFLATE_MAKE_OPT(go->deflate_size); |
---|
| 523 | } |
---|
| 524 | if (p != p0 && go->deflate_correct && go->deflate_draft) { |
---|
| 525 | p[0] = CI_DEFLATE_DRAFT; |
---|
| 526 | p[1] = CILEN_DEFLATE; |
---|
| 527 | p[2] = p[2 - CILEN_DEFLATE]; |
---|
| 528 | p[3] = DEFLATE_CHK_SEQUENCE; |
---|
| 529 | p += CILEN_DEFLATE; |
---|
| 530 | } |
---|
| 531 | } |
---|
| 532 | if (go->bsd_compress) { |
---|
| 533 | p[0] = CI_BSD_COMPRESS; |
---|
| 534 | p[1] = CILEN_BSD_COMPRESS; |
---|
| 535 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits); |
---|
| 536 | if (p != p0) { |
---|
| 537 | p += CILEN_BSD_COMPRESS; /* not the first option */ |
---|
| 538 | } else { |
---|
| 539 | for (;;) { |
---|
| 540 | res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 0); |
---|
| 541 | if (res > 0) { |
---|
| 542 | p += CILEN_BSD_COMPRESS; |
---|
| 543 | break; |
---|
| 544 | } |
---|
| 545 | if (res < 0 || go->bsd_bits <= BSD_MIN_BITS) { |
---|
| 546 | go->bsd_compress = 0; |
---|
| 547 | break; |
---|
| 548 | } |
---|
| 549 | --go->bsd_bits; |
---|
| 550 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits); |
---|
| 551 | } |
---|
| 552 | } |
---|
| 553 | } |
---|
| 554 | /* XXX Should Predictor 2 be preferable to Predictor 1? */ |
---|
| 555 | if (go->predictor_1) { |
---|
| 556 | p[0] = CI_PREDICTOR_1; |
---|
| 557 | p[1] = CILEN_PREDICTOR_1; |
---|
| 558 | if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 0) <= 0) { |
---|
| 559 | go->predictor_1 = 0; |
---|
| 560 | } else { |
---|
| 561 | p += CILEN_PREDICTOR_1; |
---|
| 562 | } |
---|
| 563 | } |
---|
| 564 | if (go->predictor_2) { |
---|
| 565 | p[0] = CI_PREDICTOR_2; |
---|
| 566 | p[1] = CILEN_PREDICTOR_2; |
---|
| 567 | if (p == p0 && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 0) <= 0) { |
---|
| 568 | go->predictor_2 = 0; |
---|
| 569 | } else { |
---|
| 570 | p += CILEN_PREDICTOR_2; |
---|
| 571 | } |
---|
| 572 | } |
---|
| 573 | |
---|
| 574 | go->method = (p > p0)? p0[0]: -1; |
---|
| 575 | |
---|
| 576 | *lenp = p - p0; |
---|
| 577 | } |
---|
| 578 | |
---|
| 579 | /* |
---|
| 580 | * ccp_ackci - process a received configure-ack, and return |
---|
| 581 | * 1 iff the packet was OK. |
---|
| 582 | */ |
---|
| 583 | static int |
---|
| 584 | ccp_ackci(f, p, len) |
---|
| 585 | fsm *f; |
---|
| 586 | u_char *p; |
---|
| 587 | int len; |
---|
| 588 | { |
---|
| 589 | ccp_options *go = &ccp_gotoptions[f->unit]; |
---|
| 590 | u_char *p0 = p; |
---|
| 591 | |
---|
| 592 | if (go->deflate) { |
---|
| 593 | if (len < CILEN_DEFLATE |
---|
| 594 | || p[0] != (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT) |
---|
| 595 | || p[1] != CILEN_DEFLATE |
---|
| 596 | || p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
---|
| 597 | || p[3] != DEFLATE_CHK_SEQUENCE) |
---|
| 598 | return 0; |
---|
| 599 | p += CILEN_DEFLATE; |
---|
| 600 | len -= CILEN_DEFLATE; |
---|
| 601 | /* XXX Cope with first/fast ack */ |
---|
| 602 | if (len == 0) |
---|
| 603 | return 1; |
---|
| 604 | if (go->deflate_correct && go->deflate_draft) { |
---|
| 605 | if (len < CILEN_DEFLATE |
---|
| 606 | || p[0] != CI_DEFLATE_DRAFT |
---|
| 607 | || p[1] != CILEN_DEFLATE |
---|
| 608 | || p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
---|
| 609 | || p[3] != DEFLATE_CHK_SEQUENCE) |
---|
| 610 | return 0; |
---|
| 611 | p += CILEN_DEFLATE; |
---|
| 612 | len -= CILEN_DEFLATE; |
---|
| 613 | } |
---|
| 614 | } |
---|
| 615 | if (go->bsd_compress) { |
---|
| 616 | if (len < CILEN_BSD_COMPRESS |
---|
| 617 | || p[0] != CI_BSD_COMPRESS || p[1] != CILEN_BSD_COMPRESS |
---|
| 618 | || p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits)) |
---|
| 619 | return 0; |
---|
| 620 | p += CILEN_BSD_COMPRESS; |
---|
| 621 | len -= CILEN_BSD_COMPRESS; |
---|
| 622 | /* XXX Cope with first/fast ack */ |
---|
| 623 | if (p == p0 && len == 0) |
---|
| 624 | return 1; |
---|
| 625 | } |
---|
| 626 | if (go->predictor_1) { |
---|
| 627 | if (len < CILEN_PREDICTOR_1 |
---|
| 628 | || p[0] != CI_PREDICTOR_1 || p[1] != CILEN_PREDICTOR_1) |
---|
| 629 | return 0; |
---|
| 630 | p += CILEN_PREDICTOR_1; |
---|
| 631 | len -= CILEN_PREDICTOR_1; |
---|
| 632 | /* XXX Cope with first/fast ack */ |
---|
| 633 | if (p == p0 && len == 0) |
---|
| 634 | return 1; |
---|
| 635 | } |
---|
| 636 | if (go->predictor_2) { |
---|
| 637 | if (len < CILEN_PREDICTOR_2 |
---|
| 638 | || p[0] != CI_PREDICTOR_2 || p[1] != CILEN_PREDICTOR_2) |
---|
| 639 | return 0; |
---|
| 640 | p += CILEN_PREDICTOR_2; |
---|
| 641 | len -= CILEN_PREDICTOR_2; |
---|
| 642 | /* XXX Cope with first/fast ack */ |
---|
| 643 | if (p == p0 && len == 0) |
---|
| 644 | return 1; |
---|
| 645 | } |
---|
| 646 | |
---|
| 647 | if (len != 0) |
---|
| 648 | return 0; |
---|
| 649 | return 1; |
---|
| 650 | } |
---|
| 651 | |
---|
| 652 | /* |
---|
| 653 | * ccp_nakci - process received configure-nak. |
---|
| 654 | * Returns 1 iff the nak was OK. |
---|
| 655 | */ |
---|
| 656 | static int |
---|
| 657 | ccp_nakci(f, p, len) |
---|
| 658 | fsm *f; |
---|
| 659 | u_char *p; |
---|
| 660 | int len; |
---|
| 661 | { |
---|
| 662 | ccp_options *go = &ccp_gotoptions[f->unit]; |
---|
| 663 | ccp_options no; /* options we've seen already */ |
---|
| 664 | ccp_options try; /* options to ask for next time */ |
---|
| 665 | |
---|
| 666 | memset(&no, 0, sizeof(no)); |
---|
| 667 | try = *go; |
---|
| 668 | |
---|
| 669 | if (go->deflate && len >= CILEN_DEFLATE |
---|
| 670 | && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT) |
---|
| 671 | && p[1] == CILEN_DEFLATE) { |
---|
| 672 | no.deflate = 1; |
---|
| 673 | /* |
---|
| 674 | * Peer wants us to use a different code size or something. |
---|
| 675 | * Stop asking for Deflate if we don't understand his suggestion. |
---|
| 676 | */ |
---|
| 677 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL |
---|
| 678 | || DEFLATE_SIZE(p[2]) < DEFLATE_MIN_SIZE |
---|
| 679 | || p[3] != DEFLATE_CHK_SEQUENCE) |
---|
| 680 | try.deflate = 0; |
---|
| 681 | else if (DEFLATE_SIZE(p[2]) < go->deflate_size) |
---|
| 682 | try.deflate_size = DEFLATE_SIZE(p[2]); |
---|
| 683 | p += CILEN_DEFLATE; |
---|
| 684 | len -= CILEN_DEFLATE; |
---|
| 685 | if (go->deflate_correct && go->deflate_draft |
---|
| 686 | && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT |
---|
| 687 | && p[1] == CILEN_DEFLATE) { |
---|
| 688 | p += CILEN_DEFLATE; |
---|
| 689 | len -= CILEN_DEFLATE; |
---|
| 690 | } |
---|
| 691 | } |
---|
| 692 | |
---|
| 693 | if (go->bsd_compress && len >= CILEN_BSD_COMPRESS |
---|
| 694 | && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) { |
---|
| 695 | no.bsd_compress = 1; |
---|
| 696 | /* |
---|
| 697 | * Peer wants us to use a different number of bits |
---|
| 698 | * or a different version. |
---|
| 699 | */ |
---|
| 700 | if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION) |
---|
| 701 | try.bsd_compress = 0; |
---|
| 702 | else if (BSD_NBITS(p[2]) < go->bsd_bits) |
---|
| 703 | try.bsd_bits = BSD_NBITS(p[2]); |
---|
| 704 | p += CILEN_BSD_COMPRESS; |
---|
| 705 | len -= CILEN_BSD_COMPRESS; |
---|
| 706 | } |
---|
| 707 | |
---|
| 708 | /* |
---|
| 709 | * Predictor-1 and 2 have no options, so they can't be Naked. |
---|
| 710 | * |
---|
[2f1b930] | 711 | * There may be remaining options but we ignore them. |
---|
[d0950ad] | 712 | */ |
---|
| 713 | |
---|
| 714 | if (f->state != OPENED) |
---|
| 715 | *go = try; |
---|
| 716 | return 1; |
---|
| 717 | } |
---|
| 718 | |
---|
| 719 | /* |
---|
| 720 | * ccp_rejci - reject some of our suggested compression methods. |
---|
| 721 | */ |
---|
| 722 | static int |
---|
| 723 | ccp_rejci(f, p, len) |
---|
| 724 | fsm *f; |
---|
| 725 | u_char *p; |
---|
| 726 | int len; |
---|
| 727 | { |
---|
| 728 | ccp_options *go = &ccp_gotoptions[f->unit]; |
---|
| 729 | ccp_options try; /* options to request next time */ |
---|
| 730 | |
---|
| 731 | try = *go; |
---|
| 732 | |
---|
| 733 | /* |
---|
| 734 | * Cope with empty configure-rejects by ceasing to send |
---|
| 735 | * configure-requests. |
---|
| 736 | */ |
---|
| 737 | if (len == 0 && all_rejected[f->unit]) |
---|
| 738 | return -1; |
---|
| 739 | |
---|
| 740 | if (go->deflate && len >= CILEN_DEFLATE |
---|
| 741 | && p[0] == (go->deflate_correct? CI_DEFLATE: CI_DEFLATE_DRAFT) |
---|
| 742 | && p[1] == CILEN_DEFLATE) { |
---|
| 743 | if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
---|
| 744 | || p[3] != DEFLATE_CHK_SEQUENCE) |
---|
| 745 | return 0; /* Rej is bad */ |
---|
| 746 | if (go->deflate_correct) |
---|
| 747 | try.deflate_correct = 0; |
---|
| 748 | else |
---|
| 749 | try.deflate_draft = 0; |
---|
| 750 | p += CILEN_DEFLATE; |
---|
| 751 | len -= CILEN_DEFLATE; |
---|
| 752 | if (go->deflate_correct && go->deflate_draft |
---|
| 753 | && len >= CILEN_DEFLATE && p[0] == CI_DEFLATE_DRAFT |
---|
| 754 | && p[1] == CILEN_DEFLATE) { |
---|
| 755 | if (p[2] != DEFLATE_MAKE_OPT(go->deflate_size) |
---|
| 756 | || p[3] != DEFLATE_CHK_SEQUENCE) |
---|
| 757 | return 0; /* Rej is bad */ |
---|
| 758 | try.deflate_draft = 0; |
---|
| 759 | p += CILEN_DEFLATE; |
---|
| 760 | len -= CILEN_DEFLATE; |
---|
| 761 | } |
---|
| 762 | if (!try.deflate_correct && !try.deflate_draft) |
---|
| 763 | try.deflate = 0; |
---|
| 764 | } |
---|
| 765 | if (go->bsd_compress && len >= CILEN_BSD_COMPRESS |
---|
| 766 | && p[0] == CI_BSD_COMPRESS && p[1] == CILEN_BSD_COMPRESS) { |
---|
| 767 | if (p[2] != BSD_MAKE_OPT(BSD_CURRENT_VERSION, go->bsd_bits)) |
---|
| 768 | return 0; |
---|
| 769 | try.bsd_compress = 0; |
---|
| 770 | p += CILEN_BSD_COMPRESS; |
---|
| 771 | len -= CILEN_BSD_COMPRESS; |
---|
| 772 | } |
---|
| 773 | if (go->predictor_1 && len >= CILEN_PREDICTOR_1 |
---|
| 774 | && p[0] == CI_PREDICTOR_1 && p[1] == CILEN_PREDICTOR_1) { |
---|
| 775 | try.predictor_1 = 0; |
---|
| 776 | p += CILEN_PREDICTOR_1; |
---|
| 777 | len -= CILEN_PREDICTOR_1; |
---|
| 778 | } |
---|
| 779 | if (go->predictor_2 && len >= CILEN_PREDICTOR_2 |
---|
| 780 | && p[0] == CI_PREDICTOR_2 && p[1] == CILEN_PREDICTOR_2) { |
---|
| 781 | try.predictor_2 = 0; |
---|
| 782 | p += CILEN_PREDICTOR_2; |
---|
| 783 | len -= CILEN_PREDICTOR_2; |
---|
| 784 | } |
---|
| 785 | |
---|
| 786 | if (len != 0) |
---|
| 787 | return 0; |
---|
| 788 | |
---|
| 789 | if (f->state != OPENED) |
---|
| 790 | *go = try; |
---|
| 791 | |
---|
| 792 | return 1; |
---|
| 793 | } |
---|
| 794 | |
---|
| 795 | /* |
---|
| 796 | * ccp_reqci - processed a received configure-request. |
---|
| 797 | * Returns CONFACK, CONFNAK or CONFREJ and the packet modified |
---|
| 798 | * appropriately. |
---|
| 799 | */ |
---|
| 800 | static int |
---|
| 801 | ccp_reqci(f, p, lenp, dont_nak) |
---|
| 802 | fsm *f; |
---|
| 803 | u_char *p; |
---|
| 804 | int *lenp; |
---|
| 805 | int dont_nak; |
---|
| 806 | { |
---|
| 807 | int ret, newret, res; |
---|
| 808 | u_char *p0, *retp; |
---|
| 809 | int len, clen, type, nb; |
---|
| 810 | ccp_options *ho = &ccp_hisoptions[f->unit]; |
---|
| 811 | ccp_options *ao = &ccp_allowoptions[f->unit]; |
---|
| 812 | |
---|
| 813 | ret = CONFACK; |
---|
| 814 | retp = p0 = p; |
---|
| 815 | len = *lenp; |
---|
| 816 | |
---|
| 817 | memset(ho, 0, sizeof(ccp_options)); |
---|
| 818 | ho->method = (len > 0)? p[0]: -1; |
---|
| 819 | |
---|
| 820 | while (len > 0) { |
---|
| 821 | newret = CONFACK; |
---|
| 822 | if (len < 2 || p[1] < 2 || p[1] > len) { |
---|
| 823 | /* length is bad */ |
---|
| 824 | clen = len; |
---|
| 825 | newret = CONFREJ; |
---|
| 826 | |
---|
| 827 | } else { |
---|
| 828 | type = p[0]; |
---|
| 829 | clen = p[1]; |
---|
| 830 | |
---|
| 831 | switch (type) { |
---|
| 832 | case CI_DEFLATE: |
---|
| 833 | case CI_DEFLATE_DRAFT: |
---|
| 834 | if (!ao->deflate || clen != CILEN_DEFLATE |
---|
| 835 | || (!ao->deflate_correct && type == CI_DEFLATE) |
---|
| 836 | || (!ao->deflate_draft && type == CI_DEFLATE_DRAFT)) { |
---|
| 837 | newret = CONFREJ; |
---|
| 838 | break; |
---|
| 839 | } |
---|
| 840 | |
---|
| 841 | ho->deflate = 1; |
---|
| 842 | ho->deflate_size = nb = DEFLATE_SIZE(p[2]); |
---|
| 843 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL |
---|
| 844 | || p[3] != DEFLATE_CHK_SEQUENCE |
---|
| 845 | || nb > ao->deflate_size || nb < DEFLATE_MIN_SIZE) { |
---|
| 846 | newret = CONFNAK; |
---|
| 847 | if (!dont_nak) { |
---|
| 848 | p[2] = DEFLATE_MAKE_OPT(ao->deflate_size); |
---|
| 849 | p[3] = DEFLATE_CHK_SEQUENCE; |
---|
| 850 | /* fall through to test this #bits below */ |
---|
| 851 | } else |
---|
| 852 | break; |
---|
| 853 | } |
---|
| 854 | |
---|
| 855 | /* |
---|
| 856 | * Check whether we can do Deflate with the window |
---|
| 857 | * size they want. If the window is too big, reduce |
---|
| 858 | * it until the kernel can cope and nak with that. |
---|
| 859 | * We only check this for the first option. |
---|
| 860 | */ |
---|
| 861 | if (p == p0) { |
---|
| 862 | for (;;) { |
---|
| 863 | res = ccp_test(f->unit, p, CILEN_DEFLATE, 1); |
---|
| 864 | if (res > 0) |
---|
| 865 | break; /* it's OK now */ |
---|
| 866 | if (res < 0 || nb == DEFLATE_MIN_SIZE || dont_nak) { |
---|
| 867 | newret = CONFREJ; |
---|
| 868 | p[2] = DEFLATE_MAKE_OPT(ho->deflate_size); |
---|
| 869 | break; |
---|
| 870 | } |
---|
| 871 | newret = CONFNAK; |
---|
| 872 | --nb; |
---|
| 873 | p[2] = DEFLATE_MAKE_OPT(nb); |
---|
| 874 | } |
---|
| 875 | } |
---|
| 876 | break; |
---|
| 877 | |
---|
| 878 | case CI_BSD_COMPRESS: |
---|
| 879 | if (!ao->bsd_compress || clen != CILEN_BSD_COMPRESS) { |
---|
| 880 | newret = CONFREJ; |
---|
| 881 | break; |
---|
| 882 | } |
---|
| 883 | |
---|
| 884 | ho->bsd_compress = 1; |
---|
| 885 | ho->bsd_bits = nb = BSD_NBITS(p[2]); |
---|
| 886 | if (BSD_VERSION(p[2]) != BSD_CURRENT_VERSION |
---|
| 887 | || nb > ao->bsd_bits || nb < BSD_MIN_BITS) { |
---|
| 888 | newret = CONFNAK; |
---|
| 889 | if (!dont_nak) { |
---|
| 890 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, ao->bsd_bits); |
---|
| 891 | /* fall through to test this #bits below */ |
---|
| 892 | } else |
---|
| 893 | break; |
---|
| 894 | } |
---|
| 895 | |
---|
| 896 | /* |
---|
| 897 | * Check whether we can do BSD-Compress with the code |
---|
| 898 | * size they want. If the code size is too big, reduce |
---|
| 899 | * it until the kernel can cope and nak with that. |
---|
| 900 | * We only check this for the first option. |
---|
| 901 | */ |
---|
| 902 | if (p == p0) { |
---|
| 903 | for (;;) { |
---|
| 904 | res = ccp_test(f->unit, p, CILEN_BSD_COMPRESS, 1); |
---|
| 905 | if (res > 0) |
---|
| 906 | break; |
---|
| 907 | if (res < 0 || nb == BSD_MIN_BITS || dont_nak) { |
---|
| 908 | newret = CONFREJ; |
---|
| 909 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, |
---|
| 910 | ho->bsd_bits); |
---|
| 911 | break; |
---|
| 912 | } |
---|
| 913 | newret = CONFNAK; |
---|
| 914 | --nb; |
---|
| 915 | p[2] = BSD_MAKE_OPT(BSD_CURRENT_VERSION, nb); |
---|
| 916 | } |
---|
| 917 | } |
---|
| 918 | break; |
---|
| 919 | |
---|
| 920 | case CI_PREDICTOR_1: |
---|
| 921 | if (!ao->predictor_1 || clen != CILEN_PREDICTOR_1) { |
---|
| 922 | newret = CONFREJ; |
---|
| 923 | break; |
---|
| 924 | } |
---|
| 925 | |
---|
| 926 | ho->predictor_1 = 1; |
---|
| 927 | if (p == p0 |
---|
| 928 | && ccp_test(f->unit, p, CILEN_PREDICTOR_1, 1) <= 0) { |
---|
| 929 | newret = CONFREJ; |
---|
| 930 | } |
---|
| 931 | break; |
---|
| 932 | |
---|
| 933 | case CI_PREDICTOR_2: |
---|
| 934 | if (!ao->predictor_2 || clen != CILEN_PREDICTOR_2) { |
---|
| 935 | newret = CONFREJ; |
---|
| 936 | break; |
---|
| 937 | } |
---|
| 938 | |
---|
| 939 | ho->predictor_2 = 1; |
---|
| 940 | if (p == p0 |
---|
| 941 | && ccp_test(f->unit, p, CILEN_PREDICTOR_2, 1) <= 0) { |
---|
| 942 | newret = CONFREJ; |
---|
| 943 | } |
---|
| 944 | break; |
---|
| 945 | |
---|
| 946 | default: |
---|
| 947 | newret = CONFREJ; |
---|
| 948 | } |
---|
| 949 | } |
---|
| 950 | |
---|
| 951 | if (newret == CONFNAK && dont_nak) |
---|
| 952 | newret = CONFREJ; |
---|
| 953 | if (!(newret == CONFACK || (newret == CONFNAK && ret == CONFREJ))) { |
---|
| 954 | /* we're returning this option */ |
---|
| 955 | if (newret == CONFREJ && ret == CONFNAK) |
---|
| 956 | retp = p0; |
---|
| 957 | ret = newret; |
---|
| 958 | if (p != retp) |
---|
| 959 | BCOPY(p, retp, clen); |
---|
| 960 | retp += clen; |
---|
| 961 | } |
---|
| 962 | |
---|
| 963 | p += clen; |
---|
| 964 | len -= clen; |
---|
| 965 | } |
---|
| 966 | |
---|
| 967 | if (ret != CONFACK) { |
---|
| 968 | if (ret == CONFREJ && *lenp == retp - p0) |
---|
| 969 | all_rejected[f->unit] = 1; |
---|
| 970 | else |
---|
| 971 | *lenp = retp - p0; |
---|
| 972 | } |
---|
| 973 | return ret; |
---|
| 974 | } |
---|
| 975 | |
---|
| 976 | /* |
---|
| 977 | * Make a string name for a compression method (or 2). |
---|
| 978 | */ |
---|
| 979 | static char * |
---|
| 980 | method_name(opt, opt2) |
---|
| 981 | ccp_options *opt, *opt2; |
---|
| 982 | { |
---|
| 983 | static char result[64]; |
---|
| 984 | |
---|
| 985 | if (!ANY_COMPRESS(*opt)) |
---|
| 986 | return "(none)"; |
---|
| 987 | switch (opt->method) { |
---|
| 988 | case CI_DEFLATE: |
---|
| 989 | case CI_DEFLATE_DRAFT: |
---|
| 990 | if (opt2 != NULL && opt2->deflate_size != opt->deflate_size) |
---|
[2f1b930] | 991 | slprintf(result, sizeof(result), "Deflate%s (%d/%d)", |
---|
| 992 | (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""), |
---|
| 993 | opt->deflate_size, opt2->deflate_size); |
---|
[d0950ad] | 994 | else |
---|
[2f1b930] | 995 | slprintf(result, sizeof(result), "Deflate%s (%d)", |
---|
| 996 | (opt->method == CI_DEFLATE_DRAFT? "(old#)": ""), |
---|
| 997 | opt->deflate_size); |
---|
[d0950ad] | 998 | break; |
---|
| 999 | case CI_BSD_COMPRESS: |
---|
| 1000 | if (opt2 != NULL && opt2->bsd_bits != opt->bsd_bits) |
---|
[2f1b930] | 1001 | slprintf(result, sizeof(result), "BSD-Compress (%d/%d)", |
---|
| 1002 | opt->bsd_bits, opt2->bsd_bits); |
---|
[d0950ad] | 1003 | else |
---|
[2f1b930] | 1004 | slprintf(result, sizeof(result), "BSD-Compress (%d)", |
---|
| 1005 | opt->bsd_bits); |
---|
[d0950ad] | 1006 | break; |
---|
| 1007 | case CI_PREDICTOR_1: |
---|
| 1008 | return "Predictor 1"; |
---|
| 1009 | case CI_PREDICTOR_2: |
---|
| 1010 | return "Predictor 2"; |
---|
| 1011 | default: |
---|
[2f1b930] | 1012 | slprintf(result, sizeof(result), "Method %d", opt->method); |
---|
[d0950ad] | 1013 | } |
---|
| 1014 | return result; |
---|
| 1015 | } |
---|
| 1016 | |
---|
| 1017 | /* |
---|
| 1018 | * CCP has come up - inform the kernel driver and log a message. |
---|
| 1019 | */ |
---|
| 1020 | static void |
---|
| 1021 | ccp_up(f) |
---|
| 1022 | fsm *f; |
---|
| 1023 | { |
---|
| 1024 | ccp_options *go = &ccp_gotoptions[f->unit]; |
---|
| 1025 | ccp_options *ho = &ccp_hisoptions[f->unit]; |
---|
| 1026 | char method1[64]; |
---|
| 1027 | |
---|
| 1028 | ccp_flags_set(f->unit, 1, 1); |
---|
| 1029 | if (ANY_COMPRESS(*go)) { |
---|
| 1030 | if (ANY_COMPRESS(*ho)) { |
---|
| 1031 | if (go->method == ho->method) { |
---|
[2f1b930] | 1032 | notice("%s compression enabled", method_name(go, ho)); |
---|
[d0950ad] | 1033 | } else { |
---|
[2f1b930] | 1034 | strlcpy(method1, method_name(go, NULL), sizeof(method1)); |
---|
| 1035 | notice("%s / %s compression enabled", |
---|
| 1036 | method1, method_name(ho, NULL)); |
---|
[d0950ad] | 1037 | } |
---|
| 1038 | } else |
---|
[2f1b930] | 1039 | notice("%s receive compression enabled", method_name(go, NULL)); |
---|
[d0950ad] | 1040 | } else if (ANY_COMPRESS(*ho)) |
---|
[2f1b930] | 1041 | notice("%s transmit compression enabled", method_name(ho, NULL)); |
---|
[d0950ad] | 1042 | } |
---|
| 1043 | |
---|
| 1044 | /* |
---|
| 1045 | * CCP has gone down - inform the kernel driver. |
---|
| 1046 | */ |
---|
| 1047 | static void |
---|
| 1048 | ccp_down(f) |
---|
| 1049 | fsm *f; |
---|
| 1050 | { |
---|
| 1051 | if (ccp_localstate[f->unit] & RACK_PENDING) |
---|
| 1052 | UNTIMEOUT(ccp_rack_timeout, f); |
---|
| 1053 | ccp_localstate[f->unit] = 0; |
---|
| 1054 | ccp_flags_set(f->unit, 1, 0); |
---|
| 1055 | } |
---|
| 1056 | |
---|
| 1057 | /* |
---|
| 1058 | * Print the contents of a CCP packet. |
---|
| 1059 | */ |
---|
| 1060 | static char *ccp_codenames[] = { |
---|
| 1061 | "ConfReq", "ConfAck", "ConfNak", "ConfRej", |
---|
| 1062 | "TermReq", "TermAck", "CodeRej", |
---|
| 1063 | NULL, NULL, NULL, NULL, NULL, NULL, |
---|
| 1064 | "ResetReq", "ResetAck", |
---|
| 1065 | }; |
---|
| 1066 | |
---|
| 1067 | static int |
---|
| 1068 | ccp_printpkt(p, plen, printer, arg) |
---|
| 1069 | u_char *p; |
---|
| 1070 | int plen; |
---|
| 1071 | void (*printer) __P((void *, char *, ...)); |
---|
| 1072 | void *arg; |
---|
| 1073 | { |
---|
| 1074 | u_char *p0, *optend; |
---|
| 1075 | int code, id, len; |
---|
| 1076 | int optlen; |
---|
| 1077 | |
---|
| 1078 | p0 = p; |
---|
| 1079 | if (plen < HEADERLEN) |
---|
| 1080 | return 0; |
---|
| 1081 | code = p[0]; |
---|
| 1082 | id = p[1]; |
---|
| 1083 | len = (p[2] << 8) + p[3]; |
---|
| 1084 | if (len < HEADERLEN || len > plen) |
---|
| 1085 | return 0; |
---|
| 1086 | |
---|
| 1087 | if (code >= 1 && code <= sizeof(ccp_codenames) / sizeof(char *) |
---|
| 1088 | && ccp_codenames[code-1] != NULL) |
---|
| 1089 | printer(arg, " %s", ccp_codenames[code-1]); |
---|
| 1090 | else |
---|
| 1091 | printer(arg, " code=0x%x", code); |
---|
| 1092 | printer(arg, " id=0x%x", id); |
---|
| 1093 | len -= HEADERLEN; |
---|
| 1094 | p += HEADERLEN; |
---|
| 1095 | |
---|
| 1096 | switch (code) { |
---|
| 1097 | case CONFREQ: |
---|
| 1098 | case CONFACK: |
---|
| 1099 | case CONFNAK: |
---|
| 1100 | case CONFREJ: |
---|
| 1101 | /* print list of possible compression methods */ |
---|
| 1102 | while (len >= 2) { |
---|
| 1103 | code = p[0]; |
---|
| 1104 | optlen = p[1]; |
---|
| 1105 | if (optlen < 2 || optlen > len) |
---|
| 1106 | break; |
---|
| 1107 | printer(arg, " <"); |
---|
| 1108 | len -= optlen; |
---|
| 1109 | optend = p + optlen; |
---|
| 1110 | switch (code) { |
---|
| 1111 | case CI_DEFLATE: |
---|
| 1112 | case CI_DEFLATE_DRAFT: |
---|
| 1113 | if (optlen >= CILEN_DEFLATE) { |
---|
| 1114 | printer(arg, "deflate%s %d", |
---|
| 1115 | (code == CI_DEFLATE_DRAFT? "(old#)": ""), |
---|
| 1116 | DEFLATE_SIZE(p[2])); |
---|
| 1117 | if (DEFLATE_METHOD(p[2]) != DEFLATE_METHOD_VAL) |
---|
| 1118 | printer(arg, " method %d", DEFLATE_METHOD(p[2])); |
---|
| 1119 | if (p[3] != DEFLATE_CHK_SEQUENCE) |
---|
| 1120 | printer(arg, " check %d", p[3]); |
---|
| 1121 | p += CILEN_DEFLATE; |
---|
| 1122 | } |
---|
| 1123 | break; |
---|
| 1124 | case CI_BSD_COMPRESS: |
---|
| 1125 | if (optlen >= CILEN_BSD_COMPRESS) { |
---|
| 1126 | printer(arg, "bsd v%d %d", BSD_VERSION(p[2]), |
---|
| 1127 | BSD_NBITS(p[2])); |
---|
| 1128 | p += CILEN_BSD_COMPRESS; |
---|
| 1129 | } |
---|
| 1130 | break; |
---|
| 1131 | case CI_PREDICTOR_1: |
---|
| 1132 | if (optlen >= CILEN_PREDICTOR_1) { |
---|
| 1133 | printer(arg, "predictor 1"); |
---|
| 1134 | p += CILEN_PREDICTOR_1; |
---|
| 1135 | } |
---|
| 1136 | break; |
---|
| 1137 | case CI_PREDICTOR_2: |
---|
| 1138 | if (optlen >= CILEN_PREDICTOR_2) { |
---|
| 1139 | printer(arg, "predictor 2"); |
---|
| 1140 | p += CILEN_PREDICTOR_2; |
---|
| 1141 | } |
---|
| 1142 | break; |
---|
| 1143 | } |
---|
[2f1b930] | 1144 | while (p < optend) |
---|
[d0950ad] | 1145 | printer(arg, " %.2x", *p++); |
---|
| 1146 | printer(arg, ">"); |
---|
[2f1b930] | 1147 | } |
---|
[d0950ad] | 1148 | break; |
---|
| 1149 | |
---|
| 1150 | case TERMACK: |
---|
| 1151 | case TERMREQ: |
---|
[2f1b930] | 1152 | if (len > 0 && *p >= ' ' && *p < 0x7f) { |
---|
[d0950ad] | 1153 | print_string(p, len, printer, arg); |
---|
| 1154 | p += len; |
---|
| 1155 | len = 0; |
---|
| 1156 | } |
---|
[2f1b930] | 1157 | break; |
---|
[d0950ad] | 1158 | } |
---|
| 1159 | |
---|
| 1160 | /* dump out the rest of the packet in hex */ |
---|
[2f1b930] | 1161 | while (--len >= 0) |
---|
[d0950ad] | 1162 | printer(arg, " %.2x", *p++); |
---|
[2f1b930] | 1163 | |
---|
[d0950ad] | 1164 | return p - p0; |
---|
| 1165 | } |
---|
| 1166 | |
---|
| 1167 | /* |
---|
| 1168 | * We have received a packet that the decompressor failed to |
---|
| 1169 | * decompress. Here we would expect to issue a reset-request, but |
---|
| 1170 | * Motorola has a patent on resetting the compressor as a result of |
---|
| 1171 | * detecting an error in the decompressed data after decompression. |
---|
| 1172 | * (See US patent 5,130,993; international patent publication number |
---|
| 1173 | * WO 91/10289; Australian patent 73296/91.) |
---|
| 1174 | * |
---|
| 1175 | * So we ask the kernel whether the error was detected after |
---|
| 1176 | * decompression; if it was, we take CCP down, thus disabling |
---|
| 1177 | * compression :-(, otherwise we issue the reset-request. |
---|
| 1178 | */ |
---|
| 1179 | static void |
---|
| 1180 | ccp_datainput(unit, pkt, len) |
---|
| 1181 | int unit; |
---|
| 1182 | u_char *pkt; |
---|
| 1183 | int len; |
---|
| 1184 | { |
---|
| 1185 | fsm *f; |
---|
| 1186 | |
---|
| 1187 | f = &ccp_fsm[unit]; |
---|
| 1188 | if (f->state == OPENED) { |
---|
| 1189 | if (ccp_fatal_error(unit)) { |
---|
| 1190 | /* |
---|
| 1191 | * Disable compression by taking CCP down. |
---|
| 1192 | */ |
---|
[2f1b930] | 1193 | error("Lost compression sync: disabling compression"); |
---|
[d0950ad] | 1194 | ccp_close(unit, "Lost compression sync"); |
---|
| 1195 | } else { |
---|
| 1196 | /* |
---|
| 1197 | * Send a reset-request to reset the peer's compressor. |
---|
| 1198 | * We don't do that if we are still waiting for an |
---|
| 1199 | * acknowledgement to a previous reset-request. |
---|
| 1200 | */ |
---|
| 1201 | if (!(ccp_localstate[f->unit] & RACK_PENDING)) { |
---|
| 1202 | fsm_sdata(f, CCP_RESETREQ, f->reqid = ++f->id, NULL, 0); |
---|
| 1203 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT); |
---|
| 1204 | ccp_localstate[f->unit] |= RACK_PENDING; |
---|
| 1205 | } else |
---|
| 1206 | ccp_localstate[f->unit] |= RREQ_REPEAT; |
---|
| 1207 | } |
---|
| 1208 | } |
---|
| 1209 | } |
---|
| 1210 | |
---|
| 1211 | /* |
---|
| 1212 | * Timeout waiting for reset-ack. |
---|
| 1213 | */ |
---|
| 1214 | static void |
---|
| 1215 | ccp_rack_timeout(arg) |
---|
| 1216 | void *arg; |
---|
| 1217 | { |
---|
| 1218 | fsm *f = arg; |
---|
| 1219 | |
---|
| 1220 | if (f->state == OPENED && ccp_localstate[f->unit] & RREQ_REPEAT) { |
---|
| 1221 | fsm_sdata(f, CCP_RESETREQ, f->reqid, NULL, 0); |
---|
| 1222 | TIMEOUT(ccp_rack_timeout, f, RACKTIMEOUT); |
---|
| 1223 | ccp_localstate[f->unit] &= ~RREQ_REPEAT; |
---|
| 1224 | } else |
---|
| 1225 | ccp_localstate[f->unit] &= ~RACK_PENDING; |
---|
| 1226 | } |
---|
| 1227 | |
---|