* A filter is represented by a tree of &f_inst structures, one structure per
* "instruction". Each &f_inst contains @code, @aux value which is
* usually the data type this instruction operates on and two generic
- * arguments (@a1, @a2). Some instructions contain pointer(s) to other
- * instructions in their (@a1, @a2) fields.
+ * arguments (@a[0], @a[1]). Some instructions contain pointer(s) to other
+ * instructions in their (@a[0], @a[1]) fields.
*
* Filters use a &f_val structure for their data. Each &f_val
* contains type and value (types are constants prefixed with %T_). Few
#include "nest/attrs.h"
#include "conf/conf.h"
#include "filter/filter.h"
+#include "filter/f-inst.h"
+#include "filter/data.h"
-#define CMP_ERROR 999
-void (*bt_assert_hook)(int result, struct f_inst *assert);
+/* Exception bits */
+enum f_exception {
+ FE_RETURN = 0x1,
+};
-static struct adata undef_adata; /* adata of length 0 used for undefined */
-/* Special undef value for paths and clists */
-static inline int
-undef_value(struct f_val v)
-{
- return ((v.type == T_PATH) || (v.type == T_CLIST) ||
- (v.type == T_ECLIST) || (v.type == T_LCLIST)) &&
- (v.val.ad == &undef_adata);
-}
-
-static struct adata *
-adata_empty(struct linpool *pool, int l)
-{
- struct adata *res = lp_alloc(pool, sizeof(struct adata) + l);
- res->length = l;
- return res;
-}
-
-static void
-pm_format(struct f_path_mask *p, buffer *buf)
-{
- buffer_puts(buf, "[= ");
-
- while (p)
- {
- switch(p->kind)
- {
- case PM_ASN:
- buffer_print(buf, "%u ", p->val);
- break;
-
- case PM_QUESTION:
- buffer_puts(buf, "? ");
- break;
-
- case PM_ASTERISK:
- buffer_puts(buf, "* ");
- break;
-
- case PM_ASN_RANGE:
- buffer_print(buf, "%u..%u ", p->val, p->val2);
- break;
-
- case PM_ASN_EXPR:
- ASSERT(0);
- }
-
- p = p->next;
- }
-
- buffer_puts(buf, "=]");
-}
-
-static inline int val_is_ip4(const struct f_val v)
-{ return (v.type == T_IP) && ipa_is_ip4(v.val.ip); }
-
-static inline int
-lcomm_cmp(lcomm v1, lcomm v2)
-{
- if (v1.asn != v2.asn)
- return (v1.asn > v2.asn) ? 1 : -1;
- if (v1.ldp1 != v2.ldp1)
- return (v1.ldp1 > v2.ldp1) ? 1 : -1;
- if (v1.ldp2 != v2.ldp2)
- return (v1.ldp2 > v2.ldp2) ? 1 : -1;
- return 0;
-}
-
-/**
- * val_compare - compare two values
- * @v1: first value
- * @v2: second value
- *
- * Compares two values and returns -1, 0, 1 on <, =, > or CMP_ERROR on
- * error. Tree module relies on this giving consistent results so
- * that it can be used for building balanced trees.
- */
-int
-val_compare(struct f_val v1, struct f_val v2)
-{
- if (v1.type != v2.type) {
- if (v1.type == T_VOID) /* Hack for else */
- return -1;
- if (v2.type == T_VOID)
- return 1;
-
- /* IP->Quad implicit conversion */
- if ((v1.type == T_QUAD) && val_is_ip4(v2))
- return uint_cmp(v1.val.i, ipa_to_u32(v2.val.ip));
- if (val_is_ip4(v1) && (v2.type == T_QUAD))
- return uint_cmp(ipa_to_u32(v1.val.ip), v2.val.i);
-
- debug( "Types do not match in val_compare\n" );
- return CMP_ERROR;
- }
-
- switch (v1.type) {
- case T_VOID:
- return 0;
- case T_ENUM:
- case T_INT:
- case T_BOOL:
- case T_PAIR:
- case T_QUAD:
- return uint_cmp(v1.val.i, v2.val.i);
- case T_EC:
- case T_RD:
- return u64_cmp(v1.val.ec, v2.val.ec);
- case T_LC:
- return lcomm_cmp(v1.val.lc, v2.val.lc);
- case T_IP:
- return ipa_compare(v1.val.ip, v2.val.ip);
- case T_NET:
- return net_compare(v1.val.net, v2.val.net);
- case T_STRING:
- return strcmp(v1.val.s, v2.val.s);
- default:
- return CMP_ERROR;
- }
-}
-
-static int
-pm_same(struct f_path_mask *m1, struct f_path_mask *m2)
-{
- while (m1 && m2)
- {
- if (m1->kind != m2->kind)
- return 0;
-
- if (m1->kind == PM_ASN_EXPR)
- {
- if (!i_same((struct f_inst *) m1->val, (struct f_inst *) m2->val))
- return 0;
- }
- else
- {
- if ((m1->val != m2->val) || (m1->val2 != m2->val2))
- return 0;
- }
-
- m1 = m1->next;
- m2 = m2->next;
- }
-
- return !m1 && !m2;
-}
-
-/**
- * val_same - compare two values
- * @v1: first value
- * @v2: second value
- *
- * Compares two values and returns 1 if they are same and 0 if not.
- * Comparison of values of different types is valid and returns 0.
- */
-int
-val_same(struct f_val v1, struct f_val v2)
-{
- int rc;
-
- rc = val_compare(v1, v2);
- if (rc != CMP_ERROR)
- return !rc;
-
- if (v1.type != v2.type)
- return 0;
-
- switch (v1.type) {
- case T_PATH_MASK:
- return pm_same(v1.val.path_mask, v2.val.path_mask);
- case T_PATH:
- case T_CLIST:
- case T_ECLIST:
- case T_LCLIST:
- return adata_same(v1.val.ad, v2.val.ad);
- case T_SET:
- return same_tree(v1.val.t, v2.val.t);
- case T_PREFIX_SET:
- return trie_same(v1.val.ti, v2.val.ti);
- default:
- bug("Invalid type in val_same(): %x", v1.type);
- }
-}
-
-static int
-clist_set_type(struct f_tree *set, struct f_val *v)
-{
- switch (set->from.type)
- {
- case T_PAIR:
- v->type = T_PAIR;
- return 1;
-
- case T_QUAD:
- v->type = T_QUAD;
- return 1;
-
- case T_IP:
- if (val_is_ip4(set->from) && val_is_ip4(set->to))
- {
- v->type = T_QUAD;
- return 1;
- }
- /* Fall through */
- default:
- v->type = T_VOID;
- return 0;
- }
-}
-
-static inline int
-eclist_set_type(struct f_tree *set)
-{ return set->from.type == T_EC; }
-
-static inline int
-lclist_set_type(struct f_tree *set)
-{ return set->from.type == T_LC; }
-
-static int
-clist_match_set(struct adata *clist, struct f_tree *set)
-{
- if (!clist)
- return 0;
-
- struct f_val v;
- if (!clist_set_type(set, &v))
- return CMP_ERROR;
-
- u32 *l = (u32 *) clist->data;
- u32 *end = l + clist->length/4;
-
- while (l < end) {
- v.val.i = *l++;
- if (find_tree(set, v))
- return 1;
- }
- return 0;
-}
-
-static int
-eclist_match_set(struct adata *list, struct f_tree *set)
-{
- if (!list)
- return 0;
-
- if (!eclist_set_type(set))
- return CMP_ERROR;
-
- struct f_val v;
- u32 *l = int_set_get_data(list);
- int len = int_set_get_size(list);
- int i;
-
- v.type = T_EC;
- for (i = 0; i < len; i += 2) {
- v.val.ec = ec_get(l, i);
- if (find_tree(set, v))
- return 1;
- }
-
- return 0;
-}
-
-static int
-lclist_match_set(struct adata *list, struct f_tree *set)
-{
- if (!list)
- return 0;
-
- if (!lclist_set_type(set))
- return CMP_ERROR;
-
- struct f_val v;
- u32 *l = int_set_get_data(list);
- int len = int_set_get_size(list);
- int i;
-
- v.type = T_LC;
- for (i = 0; i < len; i += 3) {
- v.val.lc = lc_get(l, i);
- if (find_tree(set, v))
- return 1;
- }
-
- return 0;
-}
-
-static struct adata *
-clist_filter(struct linpool *pool, struct adata *list, struct f_val set, int pos)
-{
- if (!list)
- return NULL;
-
- int tree = (set.type == T_SET); /* 1 -> set is T_SET, 0 -> set is T_CLIST */
- struct f_val v;
- if (tree)
- clist_set_type(set.val.t, &v);
- else
- v.type = T_PAIR;
-
- int len = int_set_get_size(list);
- u32 *l = int_set_get_data(list);
- u32 tmp[len];
- u32 *k = tmp;
- u32 *end = l + len;
-
- while (l < end) {
- v.val.i = *l++;
- /* pos && member(val, set) || !pos && !member(val, set), member() depends on tree */
- if ((tree ? !!find_tree(set.val.t, v) : int_set_contains(set.val.ad, v.val.i)) == pos)
- *k++ = v.val.i;
- }
-
- uint nl = (k - tmp) * sizeof(u32);
- if (nl == list->length)
- return list;
-
- struct adata *res = adata_empty(pool, nl);
- memcpy(res->data, tmp, nl);
- return res;
-}
-
-static struct adata *
-eclist_filter(struct linpool *pool, struct adata *list, struct f_val set, int pos)
-{
- if (!list)
- return NULL;
-
- int tree = (set.type == T_SET); /* 1 -> set is T_SET, 0 -> set is T_CLIST */
- struct f_val v;
-
- int len = int_set_get_size(list);
- u32 *l = int_set_get_data(list);
- u32 tmp[len];
- u32 *k = tmp;
- int i;
-
- v.type = T_EC;
- for (i = 0; i < len; i += 2) {
- v.val.ec = ec_get(l, i);
- /* pos && member(val, set) || !pos && !member(val, set), member() depends on tree */
- if ((tree ? !!find_tree(set.val.t, v) : ec_set_contains(set.val.ad, v.val.ec)) == pos) {
- *k++ = l[i];
- *k++ = l[i+1];
- }
- }
-
- uint nl = (k - tmp) * sizeof(u32);
- if (nl == list->length)
- return list;
-
- struct adata *res = adata_empty(pool, nl);
- memcpy(res->data, tmp, nl);
- return res;
-}
-
-static struct adata *
-lclist_filter(struct linpool *pool, struct adata *list, struct f_val set, int pos)
-{
- if (!list)
- return NULL;
-
- int tree = (set.type == T_SET); /* 1 -> set is T_SET, 0 -> set is T_CLIST */
- struct f_val v;
-
- int len = int_set_get_size(list);
- u32 *l = int_set_get_data(list);
- u32 tmp[len];
- u32 *k = tmp;
- int i;
-
- v.type = T_LC;
- for (i = 0; i < len; i += 3) {
- v.val.lc = lc_get(l, i);
- /* pos && member(val, set) || !pos && !member(val, set), member() depends on tree */
- if ((tree ? !!find_tree(set.val.t, v) : lc_set_contains(set.val.ad, v.val.lc)) == pos)
- k = lc_copy(k, l+i);
- }
-
- uint nl = (k - tmp) * sizeof(u32);
- if (nl == list->length)
- return list;
-
- struct adata *res = adata_empty(pool, nl);
- memcpy(res->data, tmp, nl);
- return res;
-}
-
-/**
- * val_in_range - implement |~| operator
- * @v1: element
- * @v2: set
- *
- * Checks if @v1 is element (|~| operator) of @v2.
- */
-static int
-val_in_range(struct f_val v1, struct f_val v2)
-{
- if ((v1.type == T_PATH) && (v2.type == T_PATH_MASK))
- return as_path_match(v1.val.ad, v2.val.path_mask);
+struct filter_stack {
+ /* Value stack for execution */
+#define F_VAL_STACK_MAX 4096
+ uint vcnt; /* Current value stack size; 0 for empty */
+ uint ecnt; /* Current execute stack size; 0 for empty */
- if ((v1.type == T_INT) && (v2.type == T_PATH))
- return as_path_contains(v2.val.ad, v1.val.i, 1);
+ struct f_val vstk[F_VAL_STACK_MAX]; /* The stack itself */
- if (((v1.type == T_PAIR) || (v1.type == T_QUAD)) && (v2.type == T_CLIST))
- return int_set_contains(v2.val.ad, v1.val.i);
- /* IP->Quad implicit conversion */
- if (val_is_ip4(v1) && (v2.type == T_CLIST))
- return int_set_contains(v2.val.ad, ipa_to_u32(v1.val.ip));
+ /* Instruction stack for execution */
+#define F_EXEC_STACK_MAX 4096
+ struct {
+ const struct f_line *line; /* The line that is being executed */
+ uint pos; /* Instruction index in the line */
+ uint ventry; /* Value stack depth on entry */
+ uint vbase; /* Where to index variable positions from */
+ enum f_exception emask; /* Exception mask */
+ } estk[F_EXEC_STACK_MAX];
+};
- if ((v1.type == T_EC) && (v2.type == T_ECLIST))
- return ec_set_contains(v2.val.ad, v1.val.ec);
+/* Internal filter state, to be allocated on stack when executing filters */
+struct filter_state {
+ /* Stacks needed for execution */
+ struct filter_stack *stack;
- if ((v1.type == T_LC) && (v2.type == T_LCLIST))
- return lc_set_contains(v2.val.ad, v1.val.lc);
+ /* The route we are processing. This may be NULL to indicate no route available. */
+ struct rte **rte;
- if ((v1.type == T_STRING) && (v2.type == T_STRING))
- return patmatch(v2.val.s, v1.val.s);
+ /* The old rta to be freed after filters are done. */
+ struct rta *old_rta;
- if ((v1.type == T_IP) && (v2.type == T_NET))
- return ipa_in_netX(v1.val.ip, v2.val.net);
+ /* Cached pointer to ea_list */
+ struct ea_list **eattrs;
- if ((v1.type == T_NET) && (v2.type == T_NET))
- return net_in_netX(v1.val.net, v2.val.net);
+ /* Linpool for adata allocation */
+ struct linpool *pool;
- if ((v1.type == T_NET) && (v2.type == T_PREFIX_SET))
- return trie_match_net(v2.val.ti, v1.val.net);
+ /* Buffer for log output */
+ struct buffer buf;
- if (v2.type != T_SET)
- return CMP_ERROR;
+ /* Filter execution flags */
+ int flags;
+};
- /* With integrated Quad<->IP implicit conversion */
- if ((v1.type == v2.val.t->from.type) ||
- ((v1.type == T_QUAD) && val_is_ip4(v2.val.t->from) && val_is_ip4(v2.val.t->to)))
- return !!find_tree(v2.val.t, v1);
+#if HAVE_THREAD_LOCAL
+_Thread_local static struct filter_state filter_state;
+_Thread_local static struct filter_stack filter_stack;
+#define FS_INIT(...) filter_state = (struct filter_state) { .stack = &filter_stack, __VA_ARGS__ }
+#else
+#define FS_INIT(...) struct filter_state filter_state = { .stack = alloca(sizeof(struct filter_stack)), __VA_ARGS__ };
+#endif
- if (v1.type == T_CLIST)
- return clist_match_set(v1.val.ad, v2.val.t);
+void (*bt_assert_hook)(int result, const struct f_line_item *assert);
- if (v1.type == T_ECLIST)
- return eclist_match_set(v1.val.ad, v2.val.t);
-
- if (v1.type == T_LCLIST)
- return lclist_match_set(v1.val.ad, v2.val.t);
-
- if (v1.type == T_PATH)
- return as_path_match_set(v1.val.ad, v2.val.t);
-
- return CMP_ERROR;
-}
-
-/*
- * val_format - format filter value
- */
-void
-val_format(struct f_val v, buffer *buf)
-{
- char buf2[1024];
- switch (v.type)
- {
- case T_VOID: buffer_puts(buf, "(void)"); return;
- case T_BOOL: buffer_puts(buf, v.val.i ? "TRUE" : "FALSE"); return;
- case T_INT: buffer_print(buf, "%u", v.val.i); return;
- case T_STRING: buffer_print(buf, "%s", v.val.s); return;
- case T_IP: buffer_print(buf, "%I", v.val.ip); return;
- case T_NET: buffer_print(buf, "%N", v.val.net); return;
- case T_PAIR: buffer_print(buf, "(%u,%u)", v.val.i >> 16, v.val.i & 0xffff); return;
- case T_QUAD: buffer_print(buf, "%R", v.val.i); return;
- case T_EC: ec_format(buf2, v.val.ec); buffer_print(buf, "%s", buf2); return;
- case T_LC: lc_format(buf2, v.val.lc); buffer_print(buf, "%s", buf2); return;
- case T_RD: rd_format(v.val.ec, buf2, 1024); buffer_print(buf, "%s", buf2); return;
- case T_PREFIX_SET: trie_format(v.val.ti, buf); return;
- case T_SET: tree_format(v.val.t, buf); return;
- case T_ENUM: buffer_print(buf, "(enum %x)%u", v.type, v.val.i); return;
- case T_PATH: as_path_format(v.val.ad, buf2, 1000); buffer_print(buf, "(path %s)", buf2); return;
- case T_CLIST: int_set_format(v.val.ad, 1, -1, buf2, 1000); buffer_print(buf, "(clist %s)", buf2); return;
- case T_ECLIST: ec_set_format(v.val.ad, -1, buf2, 1000); buffer_print(buf, "(eclist %s)", buf2); return;
- case T_LCLIST: lc_set_format(v.val.ad, -1, buf2, 1000); buffer_print(buf, "(lclist %s)", buf2); return;
- case T_PATH_MASK: pm_format(v.val.path_mask, buf); return;
- default: buffer_print(buf, "[unknown type %x]", v.type); return;
- }
-}
-
-static struct rte **f_rte;
-static struct rta *f_old_rta;
-static struct ea_list **f_eattrs;
-static struct linpool *f_pool;
-static struct buffer f_buf;
-static int f_flags;
-
-static inline void f_cache_eattrs(void)
+static inline void f_cache_eattrs(struct filter_state *fs)
{
- f_eattrs = &((*f_rte)->attrs->eattrs);
+ fs->eattrs = &((*fs->rte)->attrs->eattrs);
}
-static inline void f_rte_cow(void)
+static inline void f_rte_cow(struct filter_state *fs)
{
- if (!((*f_rte)->flags & REF_COW))
+ if (!((*fs->rte)->flags & REF_COW))
return;
- *f_rte = rte_do_cow(*f_rte);
+ *fs->rte = rte_cow(*fs->rte);
}
/*
* rta_cow - prepare rta for modification by filter
*/
static void
-f_rta_cow(void)
+f_rta_cow(struct filter_state *fs)
{
- if (!rta_is_cached((*f_rte)->attrs))
+ if (!rta_is_cached((*fs->rte)->attrs))
return;
/* Prepare to modify rte */
- f_rte_cow();
+ f_rte_cow(fs);
/* Store old rta to free it later, it stores reference from rte_cow() */
- f_old_rta = (*f_rte)->attrs;
+ fs->old_rta = (*fs->rte)->attrs;
/*
* Get shallow copy of rta. Fields eattrs and nexthops of rta are shared
- * with f_old_rta (they will be copied when the cached rta will be obtained
+ * with fs->old_rta (they will be copied when the cached rta will be obtained
* at the end of f_run()), also the lock of hostentry is inherited (we
* suppose hostentry is not changed by filters).
*/
- (*f_rte)->attrs = rta_do_cow((*f_rte)->attrs, f_pool);
+ (*fs->rte)->attrs = rta_do_cow((*fs->rte)->attrs, fs->pool);
/* Re-cache the ea_list */
- f_cache_eattrs();
-}
-
-static char *
-val_format_str(struct f_val v) {
- buffer b;
- LOG_BUFFER_INIT(b);
- val_format(v, &b);
- return lp_strdup(f_pool, b.start);
+ f_cache_eattrs(fs);
}
static struct tbf rl_runtime_err = TBF_DEFAULT_LOG_LIMITS;
-#define runtime(fmt, ...) do { \
- if (!(f_flags & FF_SILENT)) \
- log_rl(&rl_runtime_err, L_ERR "filters, line %d: " fmt, what->lineno, ##__VA_ARGS__); \
- res.type = T_RETURN; \
- res.val.i = F_ERROR; \
- return res; \
- } while(0)
-
-#define ARG_ANY(n) INTERPRET(v##n, what->a##n.p)
-
-#define ARG(n,t) ARG_ANY(n) \
- if (v##n.type != t) \
- runtime("Argument %d of instruction %s must be of type %02x, got %02x", \
- n, f_instruction_name(what->fi_code), t, v##n.type);
-
-#define INTERPRET(val, what_) \
- val = interpret(what_); \
- if (val.type & T_RETURN) \
- return val;
-
-#define ACCESS_RTE \
- do { if (!f_rte) runtime("No route to access"); } while (0)
-
-#define ACCESS_EATTRS \
- do { if (!f_eattrs) f_cache_eattrs(); } while (0)
-
-#define BITFIELD_MASK(what) \
- (1u << (what->a2.i >> 24))
-
/**
* interpret
+ * @fs: filter state
* @what: filter to interpret
*
* Interpret given tree of filter instructions. This is core function
* are either integers, or pointers to instruction trees. Common
* instructions like +, that have two expressions as arguments use
* TWOARGS macro to get both of them evaluated.
- *
- * &f_val structures are copied around, so there are no problems with
- * memory managment.
*/
-static struct f_val
-interpret(struct f_inst *what)
+static enum filter_return
+interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
{
- struct symbol *sym;
- struct f_val v1, v2, v3, res = { .type = T_VOID }, *vp;
- unsigned u1, u2;
- int i;
- u32 as;
-
- for ( ; what; what = what->next) {
- res.type = T_VOID;
- switch(what->fi_code) {
-/* Binary operators */
- case FI_ADD:
- ARG(1,T_INT);
- ARG(2,T_INT);
- res.type = T_INT;
- res.val.i = v1.val.i + v2.val.i;
- break;
- case FI_SUBTRACT:
- ARG(1,T_INT);
- ARG(2,T_INT);
- res.type = T_INT;
- res.val.i = v1.val.i - v2.val.i;
- break;
- case FI_MULTIPLY:
- ARG(1,T_INT);
- ARG(2,T_INT);
- res.type = T_INT;
- res.val.i = v1.val.i * v2.val.i;
- break;
- case FI_DIVIDE:
- ARG(1,T_INT);
- ARG(2,T_INT);
- res.type = T_INT;
- if (v2.val.i == 0) runtime( "Mother told me not to divide by 0" );
- res.val.i = v1.val.i / v2.val.i;
- break;
- case FI_AND:
- case FI_OR:
- ARG(1,T_BOOL);
- if (v1.val.i == (what->fi_code == FI_OR)) {
- res.type = T_BOOL;
- res.val.i = v1.val.i;
- } else {
- ARG(2,T_BOOL);
- res = v2;
- }
- break;
- case FI_PAIR_CONSTRUCT:
- ARG(1,T_INT);
- ARG(2,T_INT);
- u1 = v1.val.i;
- u2 = v2.val.i;
- if ((u1 > 0xFFFF) || (u2 > 0xFFFF))
- runtime( "Can't operate with value out of bounds in pair constructor" );
- res.val.i = (u1 << 16) | u2;
- res.type = T_PAIR;
- break;
-
- case FI_EC_CONSTRUCT:
- {
- ARG_ANY(1);
- ARG(2, T_INT);
-
- int check, ipv4_used;
- u32 key, val;
-
- if (v1.type == T_INT) {
- ipv4_used = 0; key = v1.val.i;
- }
- else if (v1.type == T_QUAD) {
- ipv4_used = 1; key = v1.val.i;
- }
- /* IP->Quad implicit conversion */
- else if (val_is_ip4(v1)) {
- ipv4_used = 1; key = ipa_to_u32(v1.val.ip);
- }
- else
- runtime("Can't operate with key of non-integer/IPv4 type in EC constructor");
-
- val = v2.val.i;
-
- /* XXXX */
- res.type = T_EC;
-
- if (what->aux == EC_GENERIC) {
- check = 0; res.val.ec = ec_generic(key, val);
- }
- else if (ipv4_used) {
- check = 1; res.val.ec = ec_ip4(what->aux, key, val);
- }
- else if (key < 0x10000) {
- check = 0; res.val.ec = ec_as2(what->aux, key, val);
- }
- else {
- check = 1; res.val.ec = ec_as4(what->aux, key, val);
- }
-
- if (check && (val > 0xFFFF))
- runtime("Can't operate with value out of bounds in EC constructor");
-
- break;
- }
-
- case FI_LC_CONSTRUCT:
- {
- ARG(1, T_INT);
- ARG(2, T_INT);
- ARG(3, T_INT);
-
- res.type = T_LC;
- res.val.lc = (lcomm) { v1.val.i, v2.val.i, v3.val.i };
-
- break;
- }
-
- case FI_PATHMASK_CONSTRUCT:
- {
- struct f_path_mask *tt = what->a1.p, *vbegin, **vv = &vbegin;
-
- while (tt) {
- *vv = lp_alloc(f_pool, sizeof(struct f_path_mask));
- if (tt->kind == PM_ASN_EXPR) {
- struct f_val res;
- INTERPRET(res, (struct f_inst *) tt->val);
- (*vv)->kind = PM_ASN;
- if (res.type != T_INT) {
- runtime( "Error resolving path mask template: value not an integer" );
- return (struct f_val) { .type = T_VOID };
- }
-
- (*vv)->val = res.val.i;
- } else {
- **vv = *tt;
- }
- tt = tt->next;
- vv = &((*vv)->next);
- }
-
- res = (struct f_val) { .type = T_PATH_MASK, .val.path_mask = vbegin };
- break;
- }
-
-/* Relational operators */
-
-#define COMPARE(x) \
- ARG_ANY(1); \
- ARG_ANY(2); \
- i = val_compare(v1, v2); \
- if (i==CMP_ERROR) \
- runtime( "Can't compare values of incompatible types" ); \
- res.type = T_BOOL; \
- res.val.i = (x); \
- break;
-
-#define SAME(x) \
- ARG_ANY(1); \
- ARG_ANY(2); \
- i = val_same(v1, v2); \
- res.type = T_BOOL; \
- res.val.i = (x); \
- break;
-
- case FI_NEQ: SAME(!i);
- case FI_EQ: SAME(i);
- case FI_LT: COMPARE(i==-1);
- case FI_LTE: COMPARE(i!=1);
-
- case FI_NOT:
- ARG(1,T_BOOL);
- res = v1;
- res.val.i = !res.val.i;
- break;
-
- case FI_MATCH:
- ARG_ANY(1);
- ARG_ANY(2);
- res.type = T_BOOL;
- res.val.i = val_in_range(v1, v2);
- if (res.val.i == CMP_ERROR)
- runtime( "~ applied on unknown type pair" );
- res.val.i = !!res.val.i;
- break;
-
- case FI_NOT_MATCH:
- ARG_ANY(1);
- ARG_ANY(2);
- res.type = T_BOOL;
- res.val.i = val_in_range(v1, v2);
- if (res.val.i == CMP_ERROR)
- runtime( "!~ applied on unknown type pair" );
- res.val.i = !res.val.i;
- break;
-
- case FI_DEFINED:
- ARG_ANY(1);
- res.type = T_BOOL;
- res.val.i = (v1.type != T_VOID) && !undef_value(v1);
- break;
- case FI_TYPE:
- ARG_ANY(1); /* There may be more types supporting this operation */
- switch (v1.type)
- {
- case T_NET:
- res.type = T_ENUM_NETTYPE;
- res.val.i = v1.val.net->type;
- break;
- default:
- runtime( "Can't determine type of this item" );
- }
- break;
- case FI_IS_V4:
- ARG(1, T_IP);
- res.type = T_BOOL;
- res.val.i = ipa_is_ip4(v1.val.ip);
- break;
-
- /* Set to indirect value, a1 = variable, a2 = value */
- case FI_SET:
- ARG_ANY(2);
- sym = what->a1.p;
- vp = sym->def;
- if ((sym->class != (SYM_VARIABLE | v2.type)) && (v2.type != T_VOID))
- {
- /* IP->Quad implicit conversion */
- if ((sym->class == (SYM_VARIABLE | T_QUAD)) && val_is_ip4(v2))
- {
- vp->type = T_QUAD;
- vp->val.i = ipa_to_u32(v2.val.ip);
- break;
- }
- runtime( "Assigning to variable of incompatible type" );
- }
- *vp = v2;
- break;
-
- /* some constants have value in a2, some in *a1.p, strange. */
- case FI_CONSTANT: /* integer (or simple type) constant, string, set, or prefix_set */
- res.type = what->aux;
-
- if (res.type == T_PREFIX_SET)
- res.val.ti = what->a2.p;
- else if (res.type == T_SET)
- res.val.t = what->a2.p;
- else if (res.type == T_STRING)
- res.val.s = what->a2.p;
- else
- res.val.i = what->a2.i;
- break;
- case FI_VARIABLE:
- case FI_CONSTANT_INDIRECT:
- res = * ((struct f_val *) what->a1.p);
- break;
- case FI_PRINT:
- ARG_ANY(1);
- val_format(v1, &f_buf);
- break;
- case FI_CONDITION: /* ? has really strange error value, so we can implement if ... else nicely :-) */
- ARG(1, T_BOOL);
- if (v1.val.i) {
- ARG_ANY(2);
- res.val.i = 0;
- } else
- res.val.i = 1;
- res.type = T_BOOL;
- break;
- case FI_NOP:
- debug( "No operation\n" );
- break;
- case FI_PRINT_AND_DIE:
- ARG_ANY(1);
- if ((what->a2.i == F_NOP || (what->a2.i != F_NONL && what->a1.p)) &&
- !(f_flags & FF_SILENT))
- log_commit(*L_INFO, &f_buf);
-
- switch (what->a2.i) {
- 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: /* FIXME (noncritical) Should print complete route along with reason to reject route */
- res.type = T_RETURN;
- res.val.i = what->a2.i;
- return res; /* We have to return now, no more processing. */
- case F_NONL:
- case F_NOP:
- break;
- default:
- bug( "unknown return type: Can't happen");
- }
- break;
- case FI_RTA_GET: /* rta access */
- {
- ACCESS_RTE;
- struct rta *rta = (*f_rte)->attrs;
- res.type = what->aux;
-
- switch (what->a2.i)
- {
- case SA_FROM: res.val.ip = rta->from; break;
- case SA_GW: res.val.ip = rta->nh.gw; break;
- case SA_NET: res.val.net = (*f_rte)->net->n.addr; break;
- case SA_PROTO: res.val.s = rta->src->proto->name; break;
- case SA_SOURCE: res.val.i = rta->source; break;
- case SA_SCOPE: res.val.i = rta->scope; break;
- case SA_DEST: res.val.i = rta->dest; break;
- case SA_IFNAME: res.val.s = rta->nh.iface ? rta->nh.iface->name : ""; break;
- case SA_IFINDEX: res.val.i = rta->nh.iface ? rta->nh.iface->index : 0; break;
-
- default:
- bug("Invalid static attribute access (%x)", res.type);
- }
- }
- break;
- case FI_RTA_SET:
- ACCESS_RTE;
- ARG_ANY(1);
- if (what->aux != v1.type)
- runtime( "Attempt to set static attribute to incompatible type" );
-
- f_rta_cow();
- {
- struct rta *rta = (*f_rte)->attrs;
-
- switch (what->a2.i)
- {
- case SA_FROM:
- rta->from = v1.val.ip;
- break;
-
- case SA_GW:
- {
- ip_addr ip = v1.val.ip;
- neighbor *n = neigh_find(rta->src->proto, ip, NULL, 0);
- if (!n || (n->scope == SCOPE_HOST))
- runtime( "Invalid gw address" );
-
- rta->dest = RTD_UNICAST;
- rta->nh.gw = ip;
- rta->nh.iface = n->iface;
- rta->nh.next = NULL;
- rta->hostentry = NULL;
- }
- break;
-
- case SA_SCOPE:
- rta->scope = v1.val.i;
- break;
+ /* No arguments allowed */
+ ASSERT(line->args == 0);
- case SA_DEST:
- i = v1.val.i;
- if ((i != RTD_BLACKHOLE) && (i != RTD_UNREACHABLE) && (i != RTD_PROHIBIT))
- runtime( "Destination can be changed only to blackhole, unreachable or prohibit" );
+ /* Initialize the filter stack */
+ struct filter_stack *fstk = fs->stack;
- rta->dest = i;
- rta->nh.gw = IPA_NONE;
- rta->nh.iface = NULL;
- rta->nh.next = NULL;
- rta->hostentry = NULL;
- break;
-
- case SA_IFNAME:
- {
- struct iface *ifa = if_find_by_name(v1.val.s);
- if (!ifa)
- runtime( "Invalid iface name" );
-
- rta->dest = RTD_UNICAST;
- rta->nh.gw = IPA_NONE;
- rta->nh.iface = ifa;
- rta->nh.next = NULL;
- rta->hostentry = NULL;
- }
- break;
-
- default:
- bug("Invalid static attribute access (%x)", res.type);
- }
- }
- break;
- case FI_EA_GET: /* Access to extended attributes */
- ACCESS_RTE;
- ACCESS_EATTRS;
- {
- u16 code = what->a2.i;
- int f_type = what->aux >> 8;
- eattr *e = ea_find(*f_eattrs, code);
-
- if (!e) {
- /* A special case: undefined as_path looks like empty as_path */
- if ((what->aux & EAF_TYPE_MASK) == EAF_TYPE_AS_PATH) {
- res.type = T_PATH;
- res.val.ad = &undef_adata;
- break;
- }
-
- /* The same special case for int_set */
- if ((what->aux & EAF_TYPE_MASK) == EAF_TYPE_INT_SET) {
- res.type = T_CLIST;
- res.val.ad = &undef_adata;
- break;
- }
-
- /* The same special case for ec_set */
- if ((what->aux & EAF_TYPE_MASK) == EAF_TYPE_EC_SET) {
- res.type = T_ECLIST;
- res.val.ad = &undef_adata;
- break;
- }
-
- /* The same special case for lc_set */
- if ((what->aux & EAF_TYPE_MASK) == EAF_TYPE_LC_SET) {
- res.type = T_LCLIST;
- res.val.ad = &undef_adata;
- break;
- }
-
- /* Undefined value */
- res.type = T_VOID;
- break;
- }
-
- switch (e->type & EAF_TYPE_MASK) {
- case EAF_TYPE_INT:
- res.type = f_type;
- res.val.i = e->u.data;
- break;
- case EAF_TYPE_ROUTER_ID:
- res.type = T_QUAD;
- res.val.i = e->u.data;
- break;
- case EAF_TYPE_OPAQUE:
- res.type = T_ENUM_EMPTY;
- res.val.i = 0;
- break;
- case EAF_TYPE_IP_ADDRESS:
- res.type = T_IP;
- struct adata * ad = e->u.ptr;
- res.val.ip = * (ip_addr *) ad->data;
- break;
- case EAF_TYPE_AS_PATH:
- res.type = T_PATH;
- res.val.ad = e->u.ptr;
- break;
- case EAF_TYPE_BITFIELD:
- res.type = T_BOOL;
- res.val.i = !!(e->u.data & BITFIELD_MASK(what));
- break;
- case EAF_TYPE_INT_SET:
- res.type = T_CLIST;
- res.val.ad = e->u.ptr;
- break;
- case EAF_TYPE_EC_SET:
- res.type = T_ECLIST;
- res.val.ad = e->u.ptr;
- break;
- case EAF_TYPE_LC_SET:
- res.type = T_LCLIST;
- res.val.ad = e->u.ptr;
- break;
- case EAF_TYPE_UNDEF:
- res.type = T_VOID;
- break;
- default:
- bug("Unknown type in e,a");
- }
- }
- break;
- case FI_EA_SET:
- ACCESS_RTE;
- ACCESS_EATTRS;
- ARG_ANY(1);
- {
- struct ea_list *l = lp_alloc(f_pool, sizeof(struct ea_list) + sizeof(eattr));
- u16 code = what->a2.i;
- int f_type = what->aux >> 8;
-
- l->next = NULL;
- l->flags = EALF_SORTED;
- l->count = 1;
- l->attrs[0].id = code;
- l->attrs[0].flags = 0;
- l->attrs[0].type = (what->aux & 0xff) | EAF_ORIGINATED | EAF_FRESH;
-
- switch (what->aux & EAF_TYPE_MASK) {
- case EAF_TYPE_INT:
- if (v1.type != f_type)
- runtime( "Setting int attribute to non-int value" );
- l->attrs[0].u.data = v1.val.i;
- break;
-
- case EAF_TYPE_ROUTER_ID:
- /* IP->Quad implicit conversion */
- if (val_is_ip4(v1)) {
- l->attrs[0].u.data = ipa_to_u32(v1.val.ip);
- break;
- }
- /* T_INT for backward compatibility */
- if ((v1.type != T_QUAD) && (v1.type != T_INT))
- runtime( "Setting quad attribute to non-quad value" );
- l->attrs[0].u.data = v1.val.i;
- break;
-
- case EAF_TYPE_OPAQUE:
- runtime( "Setting opaque attribute is not allowed" );
- break;
- case EAF_TYPE_IP_ADDRESS:
- if (v1.type != T_IP)
- runtime( "Setting ip attribute to non-ip value" );
- int len = sizeof(ip_addr);
- struct adata *ad = lp_alloc(f_pool, sizeof(struct adata) + len);
- ad->length = len;
- (* (ip_addr *) ad->data) = v1.val.ip;
- l->attrs[0].u.ptr = ad;
- break;
- case EAF_TYPE_AS_PATH:
- if (v1.type != T_PATH)
- runtime( "Setting path attribute to non-path value" );
- l->attrs[0].u.ptr = v1.val.ad;
- break;
- case EAF_TYPE_BITFIELD:
- if (v1.type != T_BOOL)
- runtime( "Setting bit in bitfield attribute to non-bool value" );
- {
- /* First, we have to find the old value */
- eattr *e = ea_find(*f_eattrs, code);
- u32 data = e ? e->u.data : 0;
-
- if (v1.val.i)
- l->attrs[0].u.data = data | BITFIELD_MASK(what);
- else
- l->attrs[0].u.data = data & ~BITFIELD_MASK(what);;
- }
- break;
- case EAF_TYPE_INT_SET:
- if (v1.type != T_CLIST)
- runtime( "Setting clist attribute to non-clist value" );
- l->attrs[0].u.ptr = v1.val.ad;
- break;
- case EAF_TYPE_EC_SET:
- if (v1.type != T_ECLIST)
- runtime( "Setting eclist attribute to non-eclist value" );
- l->attrs[0].u.ptr = v1.val.ad;
- break;
- case EAF_TYPE_LC_SET:
- if (v1.type != T_LCLIST)
- runtime( "Setting lclist attribute to non-lclist value" );
- l->attrs[0].u.ptr = v1.val.ad;
- break;
- case EAF_TYPE_UNDEF:
- if (v1.type != T_VOID)
- runtime( "Setting void attribute to non-void value" );
- l->attrs[0].u.data = 0;
- break;
- default: bug("Unknown type in e,S");
- }
-
- f_rta_cow();
- l->next = *f_eattrs;
- *f_eattrs = l;
- }
- break;
- case FI_PREF_GET:
- ACCESS_RTE;
- res.type = T_INT;
- res.val.i = (*f_rte)->pref;
- break;
- case FI_PREF_SET:
- ACCESS_RTE;
- ARG(1,T_INT);
- if (v1.val.i > 0xFFFF)
- runtime( "Setting preference value out of bounds" );
- f_rte_cow();
- (*f_rte)->pref = v1.val.i;
- break;
- case FI_LENGTH: /* Get length of */
- ARG_ANY(1);
- res.type = T_INT;
- switch(v1.type) {
- case T_NET: res.val.i = net_pxlen(v1.val.net); break;
- case T_PATH: res.val.i = as_path_getlen(v1.val.ad); break;
- case T_CLIST: res.val.i = int_set_get_size(v1.val.ad); break;
- case T_ECLIST: res.val.i = ec_set_get_size(v1.val.ad); break;
- case T_LCLIST: res.val.i = lc_set_get_size(v1.val.ad); break;
- default: runtime( "Prefix, path, clist or eclist expected" );
- }
- break;
- case FI_SADR_SRC: /* Get SADR src prefix */
- ARG(1, T_NET);
- if (!net_is_sadr(v1.val.net))
- runtime( "SADR expected" );
-
- {
- net_addr_ip6_sadr *net = (void *) v1.val.net;
- net_addr *src = lp_alloc(f_pool, sizeof(net_addr_ip6));
- net_fill_ip6(src, net->src_prefix, net->src_pxlen);
-
- res.type = T_NET;
- res.val.net = src;
- }
- break;
- case FI_ROA_MAXLEN: /* Get ROA max prefix length */
- ARG(1, T_NET);
- if (!net_is_roa(v1.val.net))
- runtime( "ROA expected" );
-
- res.type = T_INT;
- res.val.i = (v1.val.net->type == NET_ROA4) ?
- ((net_addr_roa4 *) v1.val.net)->max_pxlen :
- ((net_addr_roa6 *) v1.val.net)->max_pxlen;
- break;
- case FI_ROA_ASN: /* Get ROA ASN */
- ARG(1, T_NET);
- if (!net_is_roa(v1.val.net))
- runtime( "ROA expected" );
-
- res.type = T_INT;
- res.val.i = (v1.val.net->type == NET_ROA4) ?
- ((net_addr_roa4 *) v1.val.net)->asn :
- ((net_addr_roa6 *) v1.val.net)->asn;
- break;
- case FI_IP: /* Convert prefix to ... */
- ARG(1, T_NET);
- res.type = T_IP;
- res.val.ip = net_prefix(v1.val.net);
- break;
- case FI_ROUTE_DISTINGUISHER:
- ARG(1, T_NET);
- res.type = T_IP;
- if (!net_is_vpn(v1.val.net))
- runtime( "VPN address expected" );
- res.type = T_RD;
- res.val.ec = net_rd(v1.val.net);
- break;
- case FI_AS_PATH_FIRST: /* Get first ASN from AS PATH */
- ARG(1, T_PATH);
-
- as = 0;
- as_path_get_first(v1.val.ad, &as);
- res.type = T_INT;
- res.val.i = as;
- break;
- case FI_AS_PATH_LAST: /* Get last ASN from AS PATH */
- ARG(1, T_PATH);
-
- as = 0;
- as_path_get_last(v1.val.ad, &as);
- res.type = T_INT;
- res.val.i = as;
- break;
- case FI_AS_PATH_LAST_NAG: /* Get last ASN from non-aggregated part of AS PATH */
- ARG(1, T_PATH);
-
- res.type = T_INT;
- res.val.i = as_path_get_last_nonaggregated(v1.val.ad);
- break;
- case FI_RETURN:
- ARG_ANY(1);
- res = v1;
- res.type |= T_RETURN;
- return res;
- case FI_CALL: /* CALL: this is special: if T_RETURN and returning some value, mask it out */
- ARG_ANY(1);
- res = interpret(what->a2.p);
- if (res.type == T_RETURN)
- return res;
- res.type &= ~T_RETURN;
- break;
- case FI_CLEAR_LOCAL_VARS: /* Clear local variables */
- for (sym = what->a1.p; sym != NULL; sym = sym->aux2)
- ((struct f_val *) sym->def)->type = T_VOID;
- break;
- case FI_SWITCH:
- ARG_ANY(1);
- {
- struct f_tree *t = find_tree(what->a2.p, v1);
- if (!t) {
- v1.type = T_VOID;
- t = find_tree(what->a2.p, v1);
- if (!t) {
- debug( "No else statement?\n");
- break;
- }
- }
- /* It is actually possible to have t->data NULL */
-
- INTERPRET(res, t->data);
- }
- break;
- case FI_IP_MASK: /* IP.MASK(val) */
- ARG(1, T_IP);
- ARG(2, T_INT);
-
- res.type = T_IP;
- res.val.ip = ipa_is_ip4(v1.val.ip) ?
- ipa_from_ip4(ip4_and(ipa_to_ip4(v1.val.ip), ip4_mkmask(v2.val.i))) :
- ipa_from_ip6(ip6_and(ipa_to_ip6(v1.val.ip), ip6_mkmask(v2.val.i)));
- break;
-
- case FI_EMPTY: /* Create empty attribute */
- res.type = what->aux;
- res.val.ad = adata_empty(f_pool, 0);
- break;
- case FI_PATH_PREPEND: /* Path prepend */
- ARG(1, T_PATH);
- ARG(2, T_INT);
-
- res.type = T_PATH;
- res.val.ad = as_path_prepend(f_pool, v1.val.ad, v2.val.i);
- break;
-
- case FI_CLIST_ADD_DEL: /* (Extended) Community list add or delete */
- ARG_ANY(1);
- ARG_ANY(2);
- if (v1.type == T_PATH)
- {
- struct f_tree *set = NULL;
- u32 key = 0;
- int pos;
-
- if (v2.type == T_INT)
- key = v2.val.i;
- else if ((v2.type == T_SET) && (v2.val.t->from.type == T_INT))
- set = v2.val.t;
- else
- runtime("Can't delete non-integer (set)");
-
- switch (what->aux)
- {
- case 'a': runtime("Can't add to path");
- case 'd': pos = 0; break;
- case 'f': pos = 1; break;
- default: bug("unknown Ca operation");
- }
-
- if (pos && !set)
- runtime("Can't filter integer");
-
- res.type = T_PATH;
- res.val.ad = as_path_filter(f_pool, v1.val.ad, set, key, pos);
- }
- else if (v1.type == T_CLIST)
- {
- /* Community (or cluster) list */
- struct f_val dummy;
- int arg_set = 0;
- uint n = 0;
-
- if ((v2.type == T_PAIR) || (v2.type == T_QUAD))
- n = v2.val.i;
- /* IP->Quad implicit conversion */
- else if (val_is_ip4(v2))
- n = ipa_to_u32(v2.val.ip);
- else if ((v2.type == T_SET) && clist_set_type(v2.val.t, &dummy))
- arg_set = 1;
- else if (v2.type == T_CLIST)
- arg_set = 2;
- else
- runtime("Can't add/delete non-pair");
-
- res.type = T_CLIST;
- switch (what->aux)
- {
- case 'a':
- if (arg_set == 1)
- runtime("Can't add set");
- else if (!arg_set)
- res.val.ad = int_set_add(f_pool, v1.val.ad, n);
- else
- res.val.ad = int_set_union(f_pool, v1.val.ad, v2.val.ad);
- break;
-
- case 'd':
- if (!arg_set)
- res.val.ad = int_set_del(f_pool, v1.val.ad, n);
- else
- res.val.ad = clist_filter(f_pool, v1.val.ad, v2, 0);
- break;
-
- case 'f':
- if (!arg_set)
- runtime("Can't filter pair");
- res.val.ad = clist_filter(f_pool, v1.val.ad, v2, 1);
- break;
+ fstk->vcnt = line->vars;
+ memset(fstk->vstk, 0, sizeof(struct f_val) * line->vars);
- default:
- bug("unknown Ca operation");
- }
- }
- else if (v1.type == T_ECLIST)
- {
- /* Extended community list */
- int arg_set = 0;
-
- /* v2.val is either EC or EC-set */
- if ((v2.type == T_SET) && eclist_set_type(v2.val.t))
- arg_set = 1;
- else if (v2.type == T_ECLIST)
- arg_set = 2;
- else if (v2.type != T_EC)
- runtime("Can't add/delete non-ec");
-
- res.type = T_ECLIST;
- switch (what->aux)
- {
- case 'a':
- if (arg_set == 1)
- runtime("Can't add set");
- else if (!arg_set)
- res.val.ad = ec_set_add(f_pool, v1.val.ad, v2.val.ec);
- else
- res.val.ad = ec_set_union(f_pool, v1.val.ad, v2.val.ad);
- break;
+ /* The same as with the value stack. Not resetting the stack for performance reasons. */
+ fstk->ecnt = 1;
+ fstk->estk[0].line = line;
+ fstk->estk[0].pos = 0;
- case 'd':
- if (!arg_set)
- res.val.ad = ec_set_del(f_pool, v1.val.ad, v2.val.ec);
- else
- res.val.ad = eclist_filter(f_pool, v1.val.ad, v2, 0);
- break;
+#define curline fstk->estk[fstk->ecnt-1]
- case 'f':
- if (!arg_set)
- runtime("Can't filter ec");
- res.val.ad = eclist_filter(f_pool, v1.val.ad, v2, 1);
- break;
-
- default:
- bug("unknown Ca operation");
- }
- }
- else if (v1.type == T_LCLIST)
- {
- /* Large community list */
- int arg_set = 0;
-
- /* v2.val is either LC or LC-set */
- if ((v2.type == T_SET) && lclist_set_type(v2.val.t))
- arg_set = 1;
- else if (v2.type == T_LCLIST)
- arg_set = 2;
- else if (v2.type != T_LC)
- runtime("Can't add/delete non-lc");
-
- res.type = T_LCLIST;
- switch (what->aux)
- {
- case 'a':
- if (arg_set == 1)
- runtime("Can't add set");
- else if (!arg_set)
- res.val.ad = lc_set_add(f_pool, v1.val.ad, v2.val.lc);
- else
- res.val.ad = lc_set_union(f_pool, v1.val.ad, v2.val.ad);
- break;
+#if DEBUGGING
+ debug("Interpreting line.");
+ f_dump_line(line, 1);
+#endif
- case 'd':
- if (!arg_set)
- res.val.ad = lc_set_del(f_pool, v1.val.ad, v2.val.lc);
- else
- res.val.ad = lclist_filter(f_pool, v1.val.ad, v2, 0);
- break;
+ while (fstk->ecnt > 0) {
+ while (curline.pos < curline.line->len) {
+ const struct f_line_item *what = &(curline.line->items[curline.pos++]);
- case 'f':
- if (!arg_set)
- runtime("Can't filter lc");
- res.val.ad = lclist_filter(f_pool, v1.val.ad, v2, 1);
- break;
+ switch (what->fi_code) {
+#define res fstk->vstk[fstk->vcnt]
+#define v1 fstk->vstk[fstk->vcnt]
+#define v2 fstk->vstk[fstk->vcnt + 1]
+#define v3 fstk->vstk[fstk->vcnt + 2]
- default:
- bug("unknown Ca operation");
+#define runtime(fmt, ...) do { \
+ if (!(fs->flags & FF_SILENT)) \
+ log_rl(&rl_runtime_err, L_ERR "filters, line %d: " fmt, what->lineno, ##__VA_ARGS__); \
+ return F_ERROR; \
+} while(0)
+
+#define falloc(size) lp_alloc(fs->pool, size)
+#define fpool fs->pool
+
+#define ACCESS_RTE do { if (!fs->rte) runtime("No route to access"); } while (0)
+#define ACCESS_EATTRS do { if (!fs->eattrs) f_cache_eattrs(fs); } while (0)
+
+#include "filter/inst-interpret.c"
+#undef res
+#undef v1
+#undef v2
+#undef v3
+#undef runtime
+#undef falloc
+#undef fpool
+#undef ACCESS_RTE
+#undef ACCESS_EATTRS
}
}
- else
- runtime("Can't add/delete to non-[e|l]clist");
-
- break;
- case FI_ROA_CHECK: /* ROA Check */
- if (what->arg1)
- {
- ARG(1, T_NET);
- ARG(2, T_INT);
-
- as = v2.val.i;
- }
- else
- {
- ACCESS_RTE;
- ACCESS_EATTRS;
- v1.val.net = (*f_rte)->net->n.addr;
-
- /* We ignore temporary attributes, probably not a problem here */
- /* 0x02 is a value of BA_AS_PATH, we don't want to include BGP headers */
- eattr *e = ea_find(*f_eattrs, EA_CODE(PROTOCOL_BGP, 0x02));
-
- if (!e || ((e->type & EAF_TYPE_MASK) != EAF_TYPE_AS_PATH))
- runtime("Missing AS_PATH attribute");
+ /* End of current line. Drop local variables before exiting. */
+ fstk->vcnt -= curline.line->vars;
+ fstk->vcnt -= curline.line->args;
+ fstk->ecnt--;
+ }
- as_path_get_last(e->u.ptr, &as);
+ if (fstk->vcnt == 0) {
+ if (val) {
+ log_rl(&rl_runtime_err, L_ERR "filters: No value left on stack");
+ return F_ERROR;
}
+ return F_NOP;
+ }
- struct rtable *table = ((struct f_inst_roa_check *) what)->rtc->table;
- if (!table)
- runtime("Missing ROA table");
-
- if (table->addr_type != NET_ROA4 && table->addr_type != NET_ROA6)
- runtime("Table type must be either ROA4 or ROA6");
-
- res.type = T_ENUM_ROA;
-
- if (table->addr_type != (v1.val.net->type == NET_IP4 ? NET_ROA4 : NET_ROA6))
- res.val.i = ROA_UNKNOWN; /* Prefix and table type mismatch */
- else
- res.val.i = net_roa_check(table, v1.val.net, as);
-
- break;
-
- case FI_FORMAT: /* Format */
- ARG_ANY(1);
-
- res.type = T_STRING;
- res.val.s = val_format_str(v1);
- break;
-
- case FI_ASSERT: /* Birdtest Assert */
- ARG(1, T_BOOL);
-
- res.type = v1.type;
- res.val = v1.val;
-
- CALL(bt_assert_hook, res.val.i, what);
- break;
+ if (val && (fstk->vcnt == 1)) {
+ *val = fstk->vstk[0];
+ return F_NOP;
+ }
- default:
- bug( "Unknown instruction %d (%c)", what->fi_code, what->fi_code & 0xff);
- }}
- return res;
+ log_rl(&rl_runtime_err, L_ERR "Too many items left on stack: %u", fstk->vcnt);
+ return F_ERROR;
}
-#undef ARG
-#undef ARG_ANY
-
-#define ARG(n) \
- if (!i_same(f1->a##n.p, f2->a##n.p)) \
- return 0;
-
-#define ONEARG ARG(1);
-#define TWOARGS ONEARG; ARG(2);
-#define THREEARGS TWOARGS; ARG(3);
-
-#define A2_SAME if (f1->a2.i != f2->a2.i) return 0;
-
-/*
- * i_same - function that does real comparing of instruction trees, you should call filter_same from outside
- */
-int
-i_same(struct f_inst *f1, struct f_inst *f2)
-{
- if ((!!f1) != (!!f2))
- return 0;
- if (!f1)
- return 1;
- if (f1->aux != f2->aux)
- return 0;
- if (f1->fi_code != f2->fi_code)
- return 0;
- if (f1 == f2) /* It looks strange, but it is possible with call rewriting trickery */
- return 1;
-
- switch(f1->fi_code) {
- case FI_ADD: /* fall through */
- case FI_SUBTRACT:
- case FI_MULTIPLY:
- case FI_DIVIDE:
- case FI_OR:
- case FI_AND:
- case FI_PAIR_CONSTRUCT:
- case FI_EC_CONSTRUCT:
- case FI_NEQ:
- case FI_EQ:
- case FI_LT:
- case FI_LTE: TWOARGS; break;
-
- case FI_PATHMASK_CONSTRUCT: if (!pm_same(f1->a1.p, f2->a1.p)) return 0; break;
-
- case FI_NOT: ONEARG; break;
- case FI_NOT_MATCH:
- case FI_MATCH: TWOARGS; break;
- case FI_DEFINED: ONEARG; break;
- case FI_TYPE: ONEARG; break;
-
- case FI_LC_CONSTRUCT:
- THREEARGS;
- break;
-
- case FI_SET:
- ARG(2);
- {
- struct symbol *s1, *s2;
- s1 = f1->a1.p;
- s2 = f2->a1.p;
- if (strcmp(s1->name, s2->name))
- return 0;
- if (s1->class != s2->class)
- return 0;
- }
- break;
-
- case FI_CONSTANT:
- switch (f1->aux) {
-
- case T_PREFIX_SET:
- if (!trie_same(f1->a2.p, f2->a2.p))
- return 0;
- break;
-
- case T_SET:
- if (!same_tree(f1->a2.p, f2->a2.p))
- return 0;
- break;
-
- case T_STRING:
- if (strcmp(f1->a2.p, f2->a2.p))
- return 0;
- break;
-
- default:
- A2_SAME;
- }
- break;
-
- case FI_CONSTANT_INDIRECT:
- if (!val_same(* (struct f_val *) f1->a1.p, * (struct f_val *) f2->a1.p))
- return 0;
- break;
-
- case FI_VARIABLE:
- if (strcmp((char *) f1->a2.p, (char *) f2->a2.p))
- return 0;
- break;
- case FI_PRINT: case FI_LENGTH: ONEARG; break;
- case FI_CONDITION: TWOARGS; break;
- case FI_NOP: case FI_EMPTY: break;
- case FI_PRINT_AND_DIE: ONEARG; A2_SAME; break;
- case FI_PREF_GET:
- case FI_RTA_GET: A2_SAME; break;
- case FI_EA_GET: A2_SAME; break;
- case FI_PREF_SET:
- case FI_RTA_SET:
- case FI_EA_SET: ONEARG; A2_SAME; break;
-
- case FI_RETURN: ONEARG; break;
- case FI_ROA_MAXLEN: ONEARG; break;
- case FI_ROA_ASN: ONEARG; break;
- case FI_SADR_SRC: ONEARG; break;
- case FI_IP: ONEARG; break;
- case FI_IS_V4: ONEARG; break;
- case FI_ROUTE_DISTINGUISHER: ONEARG; break;
- case FI_CALL: /* Call rewriting trickery to avoid exponential behaviour */
- ONEARG;
- if (!i_same(f1->a2.p, f2->a2.p))
- return 0;
- f2->a2.p = f1->a2.p;
- break;
- case FI_CLEAR_LOCAL_VARS: break; /* internal instruction */
- case FI_SWITCH: ONEARG; if (!same_tree(f1->a2.p, f2->a2.p)) return 0; break;
- case FI_IP_MASK: TWOARGS; break;
- case FI_PATH_PREPEND: TWOARGS; break;
- case FI_CLIST_ADD_DEL: TWOARGS; break;
- case FI_AS_PATH_FIRST:
- case FI_AS_PATH_LAST:
- case FI_AS_PATH_LAST_NAG: ONEARG; break;
- case FI_ROA_CHECK:
- TWOARGS;
- /* Does not really make sense - ROA check results may change anyway */
- if (strcmp(((struct f_inst_roa_check *) f1)->rtc->name,
- ((struct f_inst_roa_check *) f2)->rtc->name))
- return 0;
- break;
- case FI_FORMAT: ONEARG; break;
- case FI_ASSERT: ONEARG; break;
- default:
- bug( "Unknown instruction %d in same (%c)", f1->fi_code, f1->fi_code & 0xff);
- }
- return i_same(f1->next, f2->next);
-}
/**
* f_run - run a filter for a route
* copied).
*
* The returned rte may reuse the (possibly cached, cloned) rta, or
- * (if rta was modificied) contains a modified uncached rta, which
+ * (if rta was modified) contains a modified uncached rta, which
* uses parts allocated from @tmp_pool and parts shared from original
* rta. There is one exception - if @rte is rw but contains a cached
* rta and that is modified, rta in returned rte is also cached.
* (and cached rta of read-only source rte is intact), if rte is
* modified in place, old cached rta is possibly freed.
*/
-int
-f_run(struct filter *filter, struct rte **rte, struct linpool *tmp_pool, int flags)
+enum filter_return
+f_run(const struct filter *filter, struct rte **rte, struct linpool *tmp_pool, int flags)
{
if (filter == FILTER_ACCEPT)
return F_ACCEPT;
int rte_cow = ((*rte)->flags & REF_COW);
DBG( "Running filter `%s'...", filter->name );
- f_rte = rte;
- f_eattrs = NULL;
- f_old_rta = NULL;
- f_pool = tmp_pool;
- f_flags = flags;
+ /* Initialize the filter state */
+ FS_INIT(
+ .rte = rte,
+ .pool = tmp_pool,
+ .flags = flags,
+ );
- LOG_BUFFER_INIT(f_buf);
+ LOG_BUFFER_INIT(filter_state.buf);
- struct f_val res = interpret(filter->root);
+ /* Run the interpreter itself */
+ enum filter_return fret = interpret(&filter_state, filter->root, NULL);
- if (f_old_rta) {
+ if (filter_state.old_rta) {
/*
- * Cached rta was modified and f_rte contains now an uncached one,
+ * Cached rta was modified and filter_state->rte contains now an uncached one,
* sharing some part with the cached one. The cached rta should
- * be freed (if rte was originally COW, f_old_rta is a clone
+ * be freed (if rte was originally COW, filter_state->old_rta is a clone
* obtained during rte_cow()).
*
* This also implements the exception mentioned in f_run()
* description. The reason for this is that rta reuses parts of
- * f_old_rta, and these may be freed during rta_free(f_old_rta).
+ * filter_state->old_rta, and these may be freed during rta_free(filter_state->old_rta).
* This is not the problem if rte was COW, because original rte
* also holds the same rta.
*/
- if (!rte_cow)
- (*f_rte)->attrs = rta_lookup((*f_rte)->attrs);
+ if (!rte_cow) {
+ /* Cache the new attrs */
+ (*filter_state.rte)->attrs = rta_lookup((*filter_state.rte)->attrs);
- rta_free(f_old_rta);
- }
+ /* Drop cached ea_list pointer */
+ filter_state.eattrs = NULL;
+ }
+ /* Uncache the old attrs and drop the pointer as it is invalid now. */
+ rta_free(filter_state.old_rta);
+ filter_state.old_rta = NULL;
+ }
- if (res.type != T_RETURN) {
- if (!(f_flags & FF_SILENT))
- log_rl(&rl_runtime_err, L_ERR "Filter %s did not return accept nor reject. Make up your mind", filter->name);
+ /* Process the filter output, log it and return */
+ if (fret < F_ACCEPT) {
+ if (!(filter_state.flags & FF_SILENT))
+ log_rl(&rl_runtime_err, L_ERR "Filter %s did not return accept nor reject. Make up your mind", filter_name(filter));
return F_ERROR;
}
DBG( "done (%u)\n", res.val.i );
- return res.val.i;
+ return fret;
}
-/* TODO: perhaps we could integrate f_eval(), f_eval_rte() and f_run() */
+/**
+ * f_eval_rte - run a filter line for an uncached route
+ * @expr: filter line to run
+ * @rte: route being filtered, may be modified
+ * @tmp_pool: all filter allocations go from this pool
+ *
+ * This specific filter entry point runs the given filter line
+ * (which must not have any arguments) on the given route.
+ *
+ * The route MUST NOT have REF_COW set and its attributes MUST NOT
+ * be cached by rta_lookup().
+ */
-struct f_val
-f_eval_rte(struct f_inst *expr, struct rte **rte, struct linpool *tmp_pool)
+enum filter_return
+f_eval_rte(const struct f_line *expr, struct rte **rte, struct linpool *tmp_pool)
{
+ FS_INIT(
+ .rte = rte,
+ .pool = tmp_pool,
+ );
- f_rte = rte;
- f_eattrs = NULL;
- f_old_rta = NULL;
- f_pool = tmp_pool;
- f_flags = 0;
+ LOG_BUFFER_INIT(filter_state.buf);
- LOG_BUFFER_INIT(f_buf);
+ ASSERT(!((*rte)->flags & REF_COW));
+ ASSERT(!rta_is_cached((*rte)->attrs));
- /* Note that in this function we assume that rte->attrs is private / uncached */
- struct f_val res = interpret(expr);
-
- return res;
+ return interpret(&filter_state, expr, NULL);
}
-struct f_val
-f_eval(struct f_inst *expr, struct linpool *tmp_pool)
+/*
+ * f_eval - get a value of a term
+ * @expr: filter line containing the term
+ * @tmp_pool: long data may get allocated from this pool
+ * @pres: here the output will be stored
+ */
+enum filter_return
+f_eval(const struct f_line *expr, struct linpool *tmp_pool, struct f_val *pres)
{
- f_flags = 0;
- f_eattrs = NULL;
- f_rte = NULL;
- f_pool = tmp_pool;
+ FS_INIT(
+ .pool = tmp_pool,
+ );
- LOG_BUFFER_INIT(f_buf);
+ LOG_BUFFER_INIT(filter_state.buf);
- return interpret(expr);
+ enum filter_return fret = interpret(&filter_state, expr, pres);
+ return fret;
}
+/*
+ * f_eval_int - get an integer value of a term
+ * Called internally from the config parser, uses its internal memory pool
+ * for allocations. Do not call in other cases.
+ */
uint
-f_eval_int(struct f_inst *expr)
+f_eval_int(const struct f_line *expr)
{
/* Called independently in parse-time to eval expressions */
- struct f_val res = f_eval(expr, cfg_mem);
+ FS_INIT(
+ .pool = cfg_mem,
+ );
+
+ struct f_val val;
- if (res.type != T_INT)
+ LOG_BUFFER_INIT(filter_state.buf);
+
+ if (interpret(&filter_state, expr, &val) > F_RETURN)
+ cf_error("Runtime error while evaluating expression");
+
+ if (val.type != T_INT)
cf_error("Integer expression expected");
- return res.val.i;
+ return val.val.i;
+}
+
+/*
+ * f_eval_buf - get a value of a term and print it to the supplied buffer
+ */
+enum filter_return
+f_eval_buf(const struct f_line *expr, struct linpool *tmp_pool, buffer *buf)
+{
+ struct f_val val;
+ enum filter_return fret = f_eval(expr, tmp_pool, &val);
+ if (fret > F_RETURN)
+ val_format(&val, buf);
+ return fret;
}
/**
* filter_same - compare two filters
* @new: first filter to be compared
- * @old: second filter to be compared, notice that this filter is
- * damaged while comparing.
+ * @old: second filter to be compared
*
* Returns 1 in case filters are same, otherwise 0. If there are
* underlying bugs, it will rather say 0 on same filters than say
* 1 on different.
*/
int
-filter_same(struct filter *new, struct filter *old)
+filter_same(const struct filter *new, const struct filter *old)
{
if (old == new) /* Handle FILTER_ACCEPT and FILTER_REJECT */
return 1;
if (old == FILTER_ACCEPT || old == FILTER_REJECT ||
new == FILTER_ACCEPT || new == FILTER_REJECT)
return 0;
- return i_same(new->root, old->root);
+
+ if ((!old->sym) && (!new->sym))
+ return f_same(new->root, old->root);
+
+ if ((!old->sym) || (!new->sym))
+ return 0;
+
+ if (strcmp(old->sym->name, new->sym->name))
+ return 0;
+
+ return new->sym->flags & SYM_FLAG_SAME;
+}
+
+/**
+ * filter_commit - do filter comparisons on all the named functions and filters
+ */
+void
+filter_commit(struct config *new, struct config *old)
+{
+ if (!old)
+ return;
+
+ struct symbol *sym, *osym;
+ WALK_LIST(sym, new->symbols)
+ switch (sym->class) {
+ case SYM_FUNCTION:
+ if ((osym = cf_find_symbol(old, sym->name)) &&
+ (osym->class == SYM_FUNCTION) &&
+ f_same(sym->function, osym->function))
+ sym->flags |= SYM_FLAG_SAME;
+ else
+ sym->flags &= ~SYM_FLAG_SAME;
+ break;
+
+ case SYM_FILTER:
+ if ((osym = cf_find_symbol(old, sym->name)) &&
+ (osym->class == SYM_FILTER) &&
+ f_same(sym->filter->root, osym->filter->root))
+ sym->flags |= SYM_FLAG_SAME;
+ else
+ sym->flags &= ~SYM_FLAG_SAME;
+ break;
+ }
+}
+
+void filters_dump_all(void)
+{
+ struct symbol *sym;
+ WALK_LIST(sym, config->symbols) {
+ switch (sym->class) {
+ case SYM_FILTER:
+ debug("Named filter %s:\n", sym->name);
+ f_dump_line(sym->filter->root, 1);
+ break;
+ case SYM_FUNCTION:
+ debug("Function %s:\n", sym->name);
+ f_dump_line(sym->function, 1);
+ break;
+ case SYM_PROTO:
+ {
+ debug("Protocol %s:\n", sym->name);
+ struct channel *c;
+ WALK_LIST(c, sym->proto->proto->channels) {
+ debug(" Channel %s (%s) IMPORT", c->name, net_label[c->net_type]);
+ if (c->in_filter == FILTER_ACCEPT)
+ debug(" ALL\n");
+ else if (c->in_filter == FILTER_REJECT)
+ debug(" NONE\n");
+ else if (c->in_filter == FILTER_UNDEF)
+ debug(" UNDEF\n");
+ else if (c->in_filter->sym) {
+ ASSERT(c->in_filter->sym->filter == c->in_filter);
+ debug(" named filter %s\n", c->in_filter->sym->name);
+ } else {
+ debug("\n");
+ f_dump_line(c->in_filter->root, 2);
+ }
+ }
+ }
+ }
+ }
}
projects / thirdparty / bird.git / blobdiff