pppd/plugins/pppoatm/text2qos.c

   1 /* text2qos.c - Converts textual representation of QOS parameters to binary
   2                 encoding */
   3
   4 /* Written 1996-2000 by Werner Almesberger, EPFL-LRC/ICA */
   5
   6 #if HAVE_CONFIG_H
   7 #include <config.h>
   8 #endif
   9
  10 #include <stdlib.h>
  11 #include <stdarg.h>
  12 #include <string.h>
  13 #include <ctype.h>
  14 #include <limits.h>
  15
  16 #include "atm.h"
  17
  18
  19 #define fetch __atmlib_fetch
  20
  21
  22 #define RATE_ERROR -2
  23
  24
  25 int __t2q_get_rate(const char **text,int up)
  26 {
  27     const char mult[] = "kKmMgGg";
  28     const char *multiplier;
  29     char *end;
  30     unsigned int rate,fract;
  31     int power;
  32
  33     if (!strncmp(*text,"max",3)) {
  34         *text += 3;
  35         return ATM_MAX_PCR;
  36     }
  37     rate = strtoul(*text,&end,10);
  38     power = fract = 0;
  39     if (*end == '.')
  40         for (end++; *end && isdigit(*end); end++) {
  41             fract = fract*10+*end-48;
  42             if (--power == -9) break;
  43         }
  44     multiplier = NULL;
  45     if (*end && (multiplier = strchr(mult,*end))) {
  46         while (multiplier >= mult) {
  47             if (rate > UINT_MAX/1000) return RATE_ERROR;
  48             rate *= 1000;
  49             power += 3;
  50             multiplier -= 2;
  51         }
  52         end++;
  53     }
  54     while (power && fract)
  55         if (power < 0) {
  56             fract /= 10;
  57             power++;
  58         }
  59         else {
  60             fract *= 10;
  61             power--;
  62         }
  63     rate += fract;
  64     if (strlen(end) < 3) {
  65         if (multiplier) return RATE_ERROR;
  66     }
  67     else if (!strncmp(end,"cps",3)) end += 3;
  68         else if (!strncmp(end,"bps",3)) {
  69                 rate = (rate+(up ? 8*ATM_CELL_PAYLOAD-1 : 0))/8/
  70                   ATM_CELL_PAYLOAD;
  71                 end += 3;
  72             }
  73             else if (multiplier) return RATE_ERROR;
  74     if (rate > INT_MAX) return RATE_ERROR;
  75     *text = end;
  76     return rate;
  77 }
  78
  79
  80 static int params(const char **text,struct atm_trafprm *a,
  81   struct atm_trafprm *b)
  82 {
  83     int value;
  84     char *end;
  85
  86     if (*(*text)++ != ':') return -1;
  87     while (1) {
  88         if (!**text) return -1;
  89         switch (fetch(text,"max_pcr=","pcr=","min_pcr=","max_sdu=","sdu=",
  90           NULL)) {
  91             case 0:
  92                 if ((value = __t2q_get_rate(text,0)) == RATE_ERROR) return -1;
  93                 if (a) a->max_pcr = value;
  94                 if (b) b->max_pcr = value;
  95                 break;
  96             case 1:
  97                 if ((value = __t2q_get_rate(text,0)) == RATE_ERROR) return -1;
  98                 if (a) a->pcr = value;
  99                 if (b) b->pcr = value;
 100                 break;
 101             case 2:
 102                 if ((value = __t2q_get_rate(text,1)) == RATE_ERROR) return -1;
 103                 if (value == ATM_MAX_PCR) return -1;
 104                 if (a) a->min_pcr = value;
 105                 if (b) b->min_pcr = value;
 106                 break;
 107             case 3:
 108             case 4:
 109                 value = strtol(*text,&end,10);
 110                 if (value < 0) return -1;
 111                 *text = end;
 112                 if (a) a->max_sdu = value;
 113                 if (b) b->max_sdu = value;
 114                 break;
 115             default:
 116                 return 0;
 117         }
 118         if (!**text) break;
 119         if (*(*text)++ != ',') return -1;
 120     }
 121     return 0;
 122 }
 123
 124
 125 int text2qos(const char *text,struct atm_qos *qos,int flags)
 126 {
 127     int traffic_class,aal;
 128
 129     traffic_class = ATM_NONE;
 130     aal = ATM_NO_AAL;
 131     do {
 132         static const unsigned char aal_number[] = { ATM_AAL0, ATM_AAL5 };
 133         int item;
 134
 135         item = fetch(&text,"!none","ubr","cbr","vbr","abr","aal0","aal5",NULL);
 136         switch (item) {
 137             case 1:
 138             case 2:
 139                 /* we don't support VBR yet */
 140             case 4:
 141                 traffic_class = item;
 142                 break;
 143             case 5:
 144             case 6:
 145                 aal = aal_number[item-5];
 146                 break;
 147             default:
 148                 return -1;
 149         }
 150     }
 151     while (*text == ',' ? text++ : 0);
 152     if (!traffic_class) return -1;
 153     if (qos && !(flags & T2Q_DEFAULTS)) memset(qos,0,sizeof(*qos));
 154     if (qos) qos->txtp.traffic_class = qos->rxtp.traffic_class = traffic_class;
 155     if (qos && aal) qos->aal = aal;
 156     if (!*text) return 0;
 157     if (params(&text,qos ? &qos->txtp : NULL,qos ? &qos->rxtp : NULL))
 158         return -1;
 159     if (!*text) return 0;
 160     switch (fetch(&text,"tx","rx",NULL)) {
 161         case 0:
 162             if (!fetch(&text,":none",NULL)) {
 163                 if (qos) qos->txtp.traffic_class = ATM_NONE;
 164                 if (*text == ',') text++;
 165                 break;
 166             }
 167             if (params(&text,qos ? &qos->txtp : NULL,NULL)) return -1;
 168             break;
 169         case 1:
 170             text -= 2;
 171             break;
 172         default:
 173             return -1;
 174     }
 175     if (!*text) return 0;
 176     if (fetch(&text,"rx",NULL)) return -1;
 177     if (!fetch(&text,":none",NULL) && qos) qos->rxtp.traffic_class = ATM_NONE;
 178     else if (params(&text,qos ? &qos->rxtp : NULL,NULL)) return -1;
 179     return *text ? -1 : 0;
 180 }