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, p) do{                     \
  15         uint32_t skew=seqnum-ti->lastrecvseq;           \
  16         if (skew<0x8fffffff) {                          \
  17             /* Ok */                                    \
  18             ti->lastrecvseq=seqnum;                     \
  19         } else if ((0-skew)<(p)->max_seq_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 SEQNUM_KEYED_FIELDS                                             \
  29     uint32_t sendseq;                                                   \
  30     uint32_t lastrecvseq;                                               \
  31     bool_t keyed
  32
  33 #define SEQNUM_KEYED_INIT(initlastrecvseq,initsendseq)  \
  34     (ti->lastrecvseq=(initlastrecvseq),                 \
  35      ti->sendseq=(initsendseq),                         \
  36      ti->keyed=True)
  37
  38 #define TRANSFORM_VALID                         \
  39     static bool_t transform_valid(void *sst)    \
  40     {                                           \
  41         struct transform_inst *ti=sst;          \
  42                                                 \
  43         return ti->keyed;                       \
  44     }
  45
  46 #define TRANSFORM_DESTROY                               \
  47     static void transform_destroy(void *sst)            \
  48     {                                                   \
  49         struct transform_inst *st=sst;                  \
  50                                                         \
  51         FILLZERO(*st); /* Destroy key material */       \
  52         free(st);                                       \
  53     }
  54
  55 #define SET_CAPAB_TRANSFORMNUM(def) do{                                 \
  56         st->ops.capab_transformnum=dict_read_number(dict, "capab-num",  \
  57                                      False, "transform", loc, (def));   \
  58         if (st->ops.capab_transformnum > CAPAB_TRANSFORMNUM_MAX)        \
  59             cfgfatal(loc,"transform","capab-num out of range 0..%d\n",  \
  60                      CAPAB_TRANSFORMNUM_MAX);                           \
  61     }while(0)
  62
  63 #define TRANSFORM_CREATE_CORE                           \
  64         struct transform_inst *ti;                      \
  65         ti=safe_malloc(sizeof(*ti),"transform_create"); \
  66         /* mlock XXX */                                 \
  67         ti->ops.st=ti;                                  \
  68         ti->ops.setkey=transform_setkey;                \
  69         ti->ops.valid=transform_valid;                  \
  70         ti->ops.delkey=transform_delkey;                \
  71         ti->ops.forwards=transform_forward;             \
  72         ti->ops.reverse=transform_reverse;              \
  73         ti->ops.destroy=transform_destroy;              \
  74         ti->keyed=False;
  75
  76 #define SEQNUM_PARAMS_FIELDS                    \
  77     uint32_t max_seq_skew
  78
  79 #define SEQNUM_PARAMS_INIT(dict,p,desc,loc)                             \
  80     (p)->max_seq_skew=dict_read_number((dict), "max-sequence-skew",     \
  81                                         False, (desc), (loc), 10);
  82
  83
  84 #endif /*TRANSFORM_COMMON_H*/