mdw@git.distorted.org.uk Git - secnet/blob - transform-common.h

   1
   2 #ifndef TRANSFORM_COMMON_H
   3 #define TRANSFORM_COMMON_H
   4
   5 #include "magic.h"
   6
   7 #define KEYED_CHECK do{                         \
   8         if (!ti->keyed) {                       \
   9             *errmsg="transform unkeyed";        \
  10             return 1;                           \
  11         }                                       \
  12     }while(0)
  13
  14 #define SEQNUM_CHECK(seqnum, max_skew) do{      \
  15         uint32_t skew=seqnum-ti->lastrecvseq;   \
  16         if (skew<0x8fffffff) {                  \
  17             /* Ok */                            \
  18             ti->lastrecvseq=seqnum;             \
  19         } else if ((0-skew)<max_skew) { \
  20             /* Ok */                            \
  21         } else {                                \
  22             /* Too much skew */                 \
  23             *errmsg="seqnum: too much skew";    \
  24             return 2;                           \
  25         }                                       \
  26     }while(0)
  27
  28 #define TRANSFORM_VALID                         \
  29     static bool_t transform_valid(void *sst)    \
  30     {                                           \
  31         struct transform_inst *ti=sst;          \
  32                                                 \
  33         return ti->keyed;                       \
  34     }
  35
  36 #define TRANSFORM_DESTROY                               \
  37     static void transform_destroy(void *sst)            \
  38     {                                                   \
  39         struct transform_inst *st=sst;                  \
  40                                                         \
  41         FILLZERO(*st); /* Destroy key material */       \
  42         free(st);                                       \
  43     }
  44
  45 #define SET_CAPAB_TRANSFORMNUM(def) do{                                 \
  46         st->ops.capab_transformnum=dict_read_number(dict, "capab-num",  \
  47                                      False, "transform", loc, def);     \
  48         if (st->ops.capab_transformnum > CAPAB_TRANSFORMNUM_MAX)        \
  49             cfgfatal(loc,"transform","capab-num out of range 0..%d\n",  \
  50                      CAPAB_TRANSFORMNUM_MAX);                           \
  51     }while(0)
  52
  53 #define TRANSFORM_CREATE_CORE                           \
  54         struct transform_inst *ti;                      \
  55         ti=safe_malloc(sizeof(*ti),"transform_create"); \
  56         /* mlock XXX */                                 \
  57         ti->ops.st=ti;                                  \
  58         ti->ops.setkey=transform_setkey;                \
  59         ti->ops.valid=transform_valid;                  \
  60         ti->ops.delkey=transform_delkey;                \
  61         ti->ops.forwards=transform_forward;             \
  62         ti->ops.reverse=transform_reverse;              \
  63         ti->ops.destroy=transform_destroy;              \
  64         ti->keyed=False;
  65
  66 #endif /*TRANSFORM_COMMON_H*/