* Filters: utility functions
*
* Copyright 1998 Pavel Machek <pavel@ucw.cz>
+ * 2017 Jan Maria Matejka <mq@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
-#include <stdio.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/signal.h>
-#include <setjmp.h>
-
#include "nest/bird.h"
-#include "lib/lists.h"
-#include "lib/resource.h"
-#include "lib/socket.h"
-#include "nest/route.h"
-#include "nest/protocol.h"
-#include "nest/iface.h"
#include "conf/conf.h"
#include "filter/filter.h"
+#include "filter/f-inst.h"
+#include "lib/idm.h"
+#include "nest/protocol.h"
+#include "nest/route.h"
+
+#define P(a,b) ((a<<8) | b)
+
+const char *
+filter_name(const struct filter *filter)
+{
+ if (!filter)
+ return "ACCEPT";
+ else if (filter == FILTER_REJECT)
+ return "REJECT";
+ else if (!filter->sym)
+ return "(unnamed)";
+ else
+ return filter->sym->name;
+}
+
+struct filter *f_new_where(struct f_inst *where)
+{
+ struct f_inst *cond = f_new_inst(FI_CONDITION, where,
+ f_new_inst(FI_DIE, F_ACCEPT),
+ f_new_inst(FI_DIE, F_REJECT));
+
+ struct filter *f = cfg_allocz(sizeof(struct filter));
+ f->root = f_linearize(cond);
+ return f;
+}
-struct f_inst *autoexec_func = NULL;
+#define CA_KEY(n) n->name, n->fda.type
+#define CA_NEXT(n) n->next
+#define CA_EQ(na,ta,nb,tb) (!strcmp(na,nb) && (ta == tb))
+#define CA_FN(n,t) (mem_hash(n, strlen(n)) ^ (t*0xaae99453U))
+#define CA_ORDER 8 /* Fixed */
-#define runtime(x) do { \
- log( L_ERR, x ); \
- res.type = T_RETURN; \
- res.val.i = F_ERROR; \
- return res; \
- } while(0)
+struct ca_storage {
+ struct ca_storage *next;
+ struct f_dynamic_attr fda;
+ u32 uc;
+ char name[0];
+};
-#define ARG(x,y) \
- x = interpret(what->y); \
- if (x.type == T_RETURN) \
- return x;
+HASH(struct ca_storage) ca_hash;
-#define ONEARG ARG(v1, arg1)
-#define TWOARGS ARG(v1, arg1) \
- ARG(v2, arg2)
+static struct idm ca_idm;
+static struct ca_storage **ca_storage;
+static uint ca_storage_max;
-static struct f_val
-interpret(struct f_inst *what)
+static void
+ca_free(resource *r)
{
- struct symbol *sym;
- struct f_val v1, v2, res;
-
- res.type = T_VOID;
- if (!what)
- return res;
-
- switch(what->code) {
- case ',':
- TWOARGS;
- break;
- case '+':
- TWOARGS;
- if (v1.type != v2.type)
- runtime( "Can not operate with values of incompatible types" );
-
- switch (res.type = v1.type) {
- case T_VOID: runtime( "Can not operate with values of type void" );
- case T_INT: res.val.i = v1.val.i + v2.val.i; break;
- default: runtime( "Usage of unknown type" );
- }
- break;
- case '=':
- ARG(v2, arg2);
- sym = what->arg1;
- switch (res.type = v2.type) {
- case T_VOID: runtime( "Can not assign void values" );
- case T_INT:
- if (sym->class != SYM_VARIABLE_INT)
- runtime( "Variable of bad type" );
- sym->aux = v2.val.i;
+ struct custom_attribute *ca = (void *) r;
+ struct ca_storage *cas = HASH_FIND(ca_hash, CA, ca->name, ca->fda->type);
+ ASSERT(cas);
+
+ ca->name = NULL;
+ ca->fda = NULL;
+ if (!--cas->uc) {
+ uint id = EA_CUSTOM_ID(cas->fda.ea_code);
+ idm_free(&ca_idm, id);
+ HASH_REMOVE(ca_hash, CA, cas);
+ ca_storage[id] = NULL;
+ mb_free(cas);
+ }
+}
+
+static void
+ca_dump(resource *r)
+{
+ struct custom_attribute *ca = (void *) r;
+ debug("name \"%s\" id 0x%04x ea_type 0x%02x f_type 0x%02x\n",
+ ca->name, ca->fda->ea_code, ca->fda->type, ca->fda->f_type);
+}
+
+static struct resclass ca_class = {
+ .name = "Custom attribute",
+ .size = sizeof(struct custom_attribute),
+ .free = ca_free,
+ .dump = ca_dump,
+ .lookup = NULL,
+ .memsize = NULL,
+};
+
+struct custom_attribute *
+ca_lookup(pool *p, const char *name, int f_type)
+{
+ int ea_type;
+
+ switch (f_type) {
+ case T_INT:
+ ea_type = EAF_TYPE_INT;
break;
- }
- break;
- case 'c':
- res.type = T_INT;
- res.val.i = (int) what->arg1;
- break;
- case 'i':
- res.type = T_INT;
- res.val.i = * ((int *) what->arg1);
- break;
- case 'p':
- ONEARG;
- printf( "Printing: " );
- switch (v1.type) {
- case T_VOID: printf( "(void)" ); break;
- case T_INT: printf( "%d", v1.val.i ); break;
- default: runtime( "Print of variable of unknown type" );
- }
- printf( "\n" );
- break;
- case '?':
- ONEARG;
- if (v1.type != T_INT)
- runtime( "If requires integer expression" );
- if (v1.val.i) {
- ARG(res,arg2);
- }
- break;
- case 'D':
- printf( "DEBUGGING PRINT\n" );
- break;
- case '0':
- printf( "No operation\n" );
- break;
- case 'd':
- printf( "Puts: %s\n", (char *) what->arg1 );
- break;
- case '!':
- switch ((int) what->arg1) {
- case F_QUITBIRD:
- die( "Filter asked me to die" );
- case F_ACCEPT:
- /* Should take care about turning ACCEPT into MODIFY */
- case F_ERROR:
- case F_REJECT:
- res.type = T_RETURN;
- res.val.i = (int) what->arg1;
+ case T_IP:
+ ea_type = EAF_TYPE_IP_ADDRESS;
+ break;
+ case T_QUAD:
+ ea_type = EAF_TYPE_ROUTER_ID;
+ break;
+ case T_PATH:
+ ea_type = EAF_TYPE_AS_PATH;
+ break;
+ case T_CLIST:
+ ea_type = EAF_TYPE_INT_SET;
+ break;
+ case T_ECLIST:
+ ea_type = EAF_TYPE_EC_SET;
+ break;
+ case T_LCLIST:
+ ea_type = EAF_TYPE_LC_SET;
break;
default:
- bug( "unknown return type: can not happen");
+ cf_error("Custom route attribute of unsupported type");
+ }
+
+ static int inited = 0;
+ if (!inited) {
+ idm_init(&ca_idm, &root_pool, 8);
+ HASH_INIT(ca_hash, &root_pool, CA_ORDER);
+
+ ca_storage_max = 256;
+ ca_storage = mb_allocz(&root_pool, sizeof(struct ca_storage *) * ca_storage_max);
+
+ inited++;
+ }
+
+ struct ca_storage *cas = HASH_FIND(ca_hash, CA, name, ea_type);
+ if (cas) {
+ cas->uc++;
+ } else {
+
+ uint id = idm_alloc(&ca_idm);
+
+ if (id >= EA_CUSTOM_BIT)
+ cf_error("Too many custom attributes.");
+
+ if (id >= ca_storage_max) {
+ ca_storage_max *= 2;
+ ca_storage = mb_realloc(ca_storage, sizeof(struct ca_storage *) * ca_storage_max * 2);
}
- break;
- default:
- bug( "Unknown instruction %d (%c)", what->code, what->code & 0xff);
+
+ cas = mb_allocz(&root_pool, sizeof(struct ca_storage) + strlen(name) + 1);
+ cas->fda = f_new_dynamic_attr(ea_type, f_type, EA_CUSTOM(id));
+ cas->uc = 1;
+
+ strcpy(cas->name, name);
+ ca_storage[id] = cas;
+
+ HASH_INSERT(ca_hash, CA, cas);
}
- if (what->next)
- return interpret(what->next);
- return res;
-}
-struct f_inst *
-f_new_inst(void)
-{
- struct f_inst * ret;
- ret = cfg_alloc(sizeof(struct f_inst));
- ret->code = 0;
- ret->arg1 = ret->arg2 = ret->next = NULL;
- return ret;
+ struct custom_attribute *ca = ralloc(p, &ca_class);
+ ca->fda = &(cas->fda);
+ ca->name = cas->name;
+ return ca;
}
-int
-f_run(struct symbol *filter, struct rte *rtein, struct rte **rteout)
+const char *
+ea_custom_name(uint ea)
{
- struct f_inst *inst;
- struct f_val res;
- debug( "Running filter `%s'...", filter->name );
-
- inst = filter->def;
- res = interpret(inst);
- if (res.type != T_RETURN)
- return F_ERROR;
- debug( "done (%d)\n", res.val.i );
- return res.val.i;
+ uint id = EA_CUSTOM_ID(ea);
+ if (id >= ca_storage_max)
+ return NULL;
+
+ if (!ca_storage[id])
+ return NULL;
+
+ return ca_storage[id]->name;
}
-void
-filters_postconfig(void)
-{
- if (autoexec_func)
- interpret(autoexec_func);
-}
projects / thirdparty / bird.git / blobdiff