filter/f-util.c

   1 /*
   2  *      Filters: utility functions
   3  *
   4  *      Copyright 1998 Pavel Machek <pavel@ucw.cz>
   5  *                2017 Jan Maria Matejka <mq@ucw.cz>
   6  *
   7  *      Can be freely distributed and used under the terms of the GNU GPL.
   8  */
   9
  10 #include "nest/bird.h"
  11 #include "conf/conf.h"
  12 #include "filter/filter.h"
  13
  14 #define P(a,b) ((a<<8) | b)
  15
  16 struct f_inst *
  17 f_new_inst(enum f_instruction_code fi_code)
  18 {
  19   struct f_inst * ret;
  20   ret = cfg_allocz(sizeof(struct f_inst));
  21   ret->fi_code = fi_code;
  22   ret->lineno = ifs->lino;
  23   return ret;
  24 }
  25
  26 struct f_inst *
  27 f_new_inst_da(enum f_instruction_code fi_code, struct f_dynamic_attr da)
  28 {
  29   struct f_inst *ret = f_new_inst(fi_code);
  30   ret->aux = (da.f_type << 8) | da.type;
  31   ret->a2.i = da.ea_code;
  32   return ret;
  33 }
  34
  35 struct f_inst *
  36 f_new_inst_sa(enum f_instruction_code fi_code, struct f_static_attr sa)
  37 {
  38   struct f_inst *ret = f_new_inst(fi_code);
  39   ret->aux = sa.f_type;
  40   ret->a2.i = sa.sa_code;
  41   ret->a1.i = sa.readonly;
  42   return ret;
  43 }
  44
  45 /*
  46  * Generate set_dynamic( operation( get_dynamic(), argument ) )
  47  */
  48 struct f_inst *
  49 f_generate_complex(int operation, int operation_aux, struct f_dynamic_attr da, struct f_inst *argument)
  50 {
  51   struct f_inst *set_dyn = f_new_inst_da(FI_EA_SET, da),
  52                 *oper = f_new_inst(operation),
  53                 *get_dyn = f_new_inst_da(FI_EA_GET, da);
  54
  55   oper->aux = operation_aux;
  56   oper->a1.p = get_dyn;
  57   oper->a2.p = argument;
  58
  59   set_dyn->a1.p = oper;
  60   return set_dyn;
  61 }
  62
  63 struct f_inst *
  64 f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn)
  65 {
  66   struct f_inst_roa_check *ret = cfg_allocz(sizeof(struct f_inst_roa_check));
  67   ret->i.fi_code = FI_ROA_CHECK;
  68   ret->i.lineno = ifs->lino;
  69   ret->i.arg1 = prefix;
  70   ret->i.arg2 = asn;
  71   /* prefix == NULL <-> asn == NULL */
  72
  73   if (table->addr_type != NET_ROA4 && table->addr_type != NET_ROA6)
  74     cf_error("%s is not a ROA table", table->name);
  75   ret->rtc = table;
  76
  77   return &ret->i;
  78 }
  79
  80 char *
  81 filter_name(struct filter *filter)
  82 {
  83   if (!filter)
  84     return "ACCEPT";
  85   else if (filter == FILTER_REJECT)
  86     return "REJECT";
  87   else if (!filter->name)
  88     return "(unnamed)";
  89   else
  90     return filter->name;
  91 }