* the source from user into a tree of &f_inst structures. These trees are
* later interpreted using code in |filter/filter.c|.
*
- * 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 (@a[0], @a[1]). Some instructions contain pointer(s) to other
- * instructions in their (@a[0], @a[1]) fields.
+ * A filter is represented by a tree of &f_inst structures, later translated
+ * into lists called &f_line. All the instructions are defined and documented
+ * in |filter/f-inst.c| definition file.
*
* Filters use a &f_val structure for their data. Each &f_val
- * contains type and value (types are constants prefixed with %T_). Few
- * of the types are special; %T_RETURN can be or-ed with a type to indicate
- * that return from a function or from the whole filter should be
- * forced. Important thing about &f_val's is that they may be copied
- * with a simple |=|. That's fine for all currently defined types: strings
- * are read-only (and therefore okay), paths are copied for each
- * operation (okay too).
+ * contains type and value (types are constants prefixed with %T_).
+ * Look into |filter/data.h| for more information and appropriate calls.
*/
#undef LOCAL_DEBUG
#include "lib/socket.h"
#include "lib/string.h"
#include "lib/unaligned.h"
-#include "lib/net.h"
#include "lib/ip.h"
+#include "lib/net.h"
+#include "lib/flowspec.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "nest/iface.h"
#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
-#define FILTER_STACK_DEPTH 16384
+/* Exception bits */
+enum f_exception {
+ FE_RETURN = 0x1,
+};
+
-/* Filter interpreter stack. Make this thread local after going parallel. */
struct filter_stack {
- struct f_val val;
+ /* 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 */
+
+ struct f_val vstk[F_VAL_STACK_MAX]; /* The stack itself */
+
+ /* 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];
};
-static struct filter_stack filter_stack[FILTER_STACK_DEPTH];
-
/* Internal filter state, to be allocated on stack when executing filters */
struct filter_state {
- struct rte **rte;
- struct rta *old_rta;
- struct ea_list **eattrs;
- struct linpool *pool;
- struct buffer buf;
+ /* Stacks needed for execution */
struct filter_stack *stack;
- int stack_ptr;
- int flags;
-};
-
-void (*bt_assert_hook)(int result, struct f_inst *assert);
-
-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);
-
- if ((v1.type == T_INT) && (v2.type == T_PATH))
- return as_path_contains(v2.val.ad, v1.val.i, 1);
-
- 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));
-
- if ((v1.type == T_EC) && (v2.type == T_ECLIST))
- return ec_set_contains(v2.val.ad, v1.val.ec);
-
- if ((v1.type == T_LC) && (v2.type == T_LCLIST))
- return lc_set_contains(v2.val.ad, v1.val.lc);
-
- if ((v1.type == T_STRING) && (v2.type == T_STRING))
- return patmatch(v2.val.s, v1.val.s);
-
- if ((v1.type == T_IP) && (v2.type == T_NET))
- return ipa_in_netX(v1.val.ip, v2.val.net);
-
- if ((v1.type == T_NET) && (v2.type == T_NET))
- return net_in_netX(v1.val.net, v2.val.net);
-
- if ((v1.type == T_NET) && (v2.type == T_PREFIX_SET))
- return trie_match_net(v2.val.ti, v1.val.net);
-
- if (v2.type != T_SET)
- return CMP_ERROR;
- /* 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);
+ /* The route we are processing. This may be NULL to indicate no route available. */
+ struct rte **rte;
- if (v1.type == T_CLIST)
- return clist_match_set(v1.val.ad, v2.val.t);
+ /* The old rta to be freed after filters are done. */
+ struct rta *old_rta;
- if (v1.type == T_ECLIST)
- return eclist_match_set(v1.val.ad, v2.val.t);
+ /* Cached pointer to ea_list */
+ struct ea_list **eattrs;
- if (v1.type == T_LCLIST)
- return lclist_match_set(v1.val.ad, v2.val.t);
+ /* Linpool for adata allocation */
+ struct linpool *pool;
- if (v1.type == T_PATH)
- return as_path_match_set(v1.val.ad, v2.val.t);
+ /* Buffer for log output */
+ struct buffer buf;
- return CMP_ERROR;
-}
+ /* Filter execution flags */
+ int flags;
+};
-/*
- * 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;
- }
-}
+_Thread_local static struct filter_state filter_state;
+_Thread_local static struct filter_stack filter_stack;
+void (*bt_assert_hook)(int result, const struct f_line_item *assert);
static inline void f_cache_eattrs(struct filter_state *fs)
{
f_cache_eattrs(fs);
}
-static char *
-val_format_str(struct filter_state *fs, struct f_val v) {
- buffer b;
- LOG_BUFFER_INIT(b);
- val_format(v, &b);
- return lp_strdup(fs->pool, b.start);
-}
-
static struct tbf rl_runtime_err = TBF_DEFAULT_LOG_LIMITS;
/**
* TWOARGS macro to get both of them evaluated.
*/
static enum filter_return
-interpret(struct filter_state *fs, struct f_inst *what)
+interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
{
- struct symbol *sym;
- struct f_val *vp;
- unsigned u1, u2;
- enum filter_return fret;
- int i;
- u32 as;
+ /* No arguments allowed */
+ ASSERT(line->args == 0);
+
+ /* Initialize the filter stack */
+ struct filter_stack *fstk = fs->stack;
+
+ fstk->vcnt = line->vars;
+ memset(fstk->vstk, 0, sizeof(struct f_val) * line->vars);
-#define res fs->stack[fs->stack_ptr].val
-#define v0 res
-#define v1 fs->stack[fs->stack_ptr + 1].val
-#define v2 fs->stack[fs->stack_ptr + 2].val
-#define v3 fs->stack[fs->stack_ptr + 3].val
+ /* 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;
- res = (struct f_val) { .type = T_VOID };
+#define curline fstk->estk[fstk->ecnt-1]
- for ( ; what; what = what->next) {
- res = (struct f_val) { .type = T_VOID };
- switch (what->fi_code) {
+#ifdef LOCAL_DEBUG
+ debug("Interpreting line.");
+ f_dump_line(line, 1);
+#endif
+
+ while (fstk->ecnt > 0) {
+ while (curline.pos < curline.line->len) {
+ const struct f_line_item *what = &(curline.line->items[curline.pos++]);
+
+ switch (what->fi_code) {
+#define res fstk->vstk[fstk->vcnt]
+#define vv(i) fstk->vstk[fstk->vcnt + (i)]
+#define v1 vv(0)
+#define v2 vv(1)
+#define v3 vv(2)
#define runtime(fmt, ...) do { \
if (!(fs->flags & FF_SILENT)) \
return F_ERROR; \
} while(0)
-#define ARG_ANY_T(n, tt) INTERPRET(what->a[n-1].p, tt)
-#define ARG_ANY(n) ARG_ANY_T(n, n)
-
-#define ARG_T(n,tt,t) do { \
- ARG_ANY_T(n,tt); \
- if (v##tt.type != t) \
- runtime("Argument %d of instruction %s must be of type %02x, got %02x", \
- n, f_instruction_name(what->fi_code), t, v##tt.type); \
-} while (0)
-
-#define ARG(n,t) ARG_T(n,n,t)
-
-#define INTERPRET(what_, n) do { \
- fs->stack_ptr += n; \
- fret = interpret(fs, what_); \
- fs->stack_ptr -= n; \
- if (fret == F_RETURN) \
- bug("This shall not happen"); \
- if (fret > F_RETURN) \
- return fret; \
-} while (0)
-
-#define ACCESS_RTE do { if (!fs->rte) runtime("No route to access"); } while (0)
+#define falloc(size) lp_alloc(fs->pool, size)
+#define fpool fs->pool
#define ACCESS_EATTRS do { if (!fs->eattrs) f_cache_eattrs(fs); } while (0)
-#define BITFIELD_MASK(what_) (1u << EA_BIT_GET(what_->a[1].i))
-
- case FI_NOP:
- bug("This shall not happen");
-
-#include "filter/f-inst-interpret.c"
-
- break;
- default:
- bug( "Unknown instruction %d (%c)", what->fi_code, what->fi_code & 0xff);
-
+#include "filter/inst-interpret.c"
#undef res
+#undef v1
+#undef v2
+#undef v3
#undef runtime
-#undef ARG_ANY
-#undef ARG
-#undef INTERPRET
-#undef ACCESS_RTE
+#undef falloc
+#undef fpool
#undef ACCESS_EATTRS
+ }
}
- }
- return F_NOP;
-}
-
-
-#define ARG(n) \
- if (!i_same(f1->a[n-1].p, f2->a[n-1].p)) \
- return 0;
-#define ONEARG ARG(1);
-#define TWOARGS ONEARG; ARG(2);
-#define THREEARGS TWOARGS; ARG(3);
-
-#define A2_SAME if (f1->a[1].i != f2->a[1].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;
+ /* End of current line. Drop local variables before exiting. */
+ fstk->vcnt = curline.ventry + curline.line->results;
+ fstk->ecnt--;
+ }
- 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->a[0].p, f2->a[0].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->a[0].p;
- s2 = f2->a[0].p;
- if (strcmp(s1->name, s2->name))
- return 0;
- if (s1->class != s2->class)
- return 0;
+ if (fstk->vcnt == 0) {
+ if (val) {
+ log_rl(&rl_runtime_err, L_ERR "filters: No value left on stack");
+ return F_ERROR;
}
- break;
-
- case FI_CONSTANT:
- switch (f1->aux) {
-
- case T_PREFIX_SET:
- if (!trie_same(f1->a[1].p, f2->a[1].p))
- return 0;
- break;
-
- case T_SET:
- if (!same_tree(f1->a[1].p, f2->a[1].p))
- return 0;
- break;
-
- case T_STRING:
- if (strcmp(f1->a[1].p, f2->a[1].p))
- return 0;
- break;
+ return F_NOP;
+ }
- default:
- A2_SAME;
- }
- break;
-
- case FI_CONSTANT_INDIRECT:
- if (!val_same(* (struct f_val *) f1->a[0].p, * (struct f_val *) f2->a[0].p))
- return 0;
- break;
-
- case FI_VARIABLE:
- if (strcmp((char *) f1->a[1].p, (char *) f2->a[1].p))
- return 0;
- break;
- case FI_PRINT: case FI_LENGTH: ONEARG; break;
- case FI_CONDITION: THREEARGS; 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->a[1].p, f2->a[1].p))
- return 0;
- f2->a[1].p = f1->a[1].p;
- break;
- case FI_CLEAR_LOCAL_VARS: break; /* internal instruction */
- case FI_SWITCH: ONEARG; if (!same_tree(f1->a[1].p, f2->a[1].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;
- /* FIXME: ROA check results may change anyway */
- if (strcmp(f1->a[2].rtc->name,
- f2->a[2].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);
+ if (val && (fstk->vcnt == 1)) {
+ *val = fstk->vstk[0];
+ return F_NOP;
}
- return i_same(f1->next, f2->next);
+
+ log_rl(&rl_runtime_err, L_ERR "Too many items left on stack: %u", fstk->vcnt);
+ return F_ERROR;
}
+
/**
* f_run - run a filter for a route
* @filter: filter to run
* 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.
* modified in place, old cached rta is possibly freed.
*/
enum filter_return
-f_run(struct filter *filter, struct rte **rte, struct linpool *tmp_pool, int flags)
+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 );
- struct filter_state fs = {
+ /* Initialize the filter state */
+ filter_state = (struct filter_state) {
+ .stack = &filter_stack,
.rte = rte,
.pool = tmp_pool,
.flags = flags,
- .stack = filter_stack,
};
- LOG_BUFFER_INIT(fs.buf);
+ LOG_BUFFER_INIT(filter_state.buf);
- enum filter_return fret = interpret(&fs, filter->root);
+ /* Run the interpreter itself */
+ enum filter_return fret = interpret(&filter_state, filter->root, NULL);
- if (fs.old_rta) {
+ if (filter_state.old_rta) {
/*
- * Cached rta was modified and fs->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, fs->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
- * fs->old_rta, and these may be freed during rta_free(fs->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)
- (*fs.rte)->attrs = rta_lookup((*fs.rte)->attrs);
+ if (!rte_cow) {
+ /* Cache the new attrs */
+ (*filter_state.rte)->attrs = rta_lookup((*filter_state.rte)->attrs);
- rta_free(fs.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;
+ }
+ /* Process the filter output, log it and return */
if (fret < F_ACCEPT) {
- if (!(fs.flags & FF_SILENT))
- log_rl(&rl_runtime_err, L_ERR "Filter %s did not return accept nor reject. Make up your mind", filter->name);
+ 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 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().
+ */
enum filter_return
-f_eval_rte(struct f_inst *expr, struct rte **rte, struct linpool *tmp_pool)
+f_eval_rte(const struct f_line *expr, struct rte **rte, struct linpool *tmp_pool)
{
-
- struct filter_state fs = {
+ filter_state = (struct filter_state) {
+ .stack = &filter_stack,
.rte = rte,
.pool = tmp_pool,
- .stack = filter_stack,
};
- LOG_BUFFER_INIT(fs.buf);
+ LOG_BUFFER_INIT(filter_state.buf);
- /* Note that in this function we assume that rte->attrs is private / uncached */
- return interpret(&fs, expr);
+ ASSERT(!((*rte)->flags & REF_COW));
+ ASSERT(!rta_is_cached((*rte)->attrs));
+
+ return interpret(&filter_state, expr, NULL);
}
+/*
+ * 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(struct f_inst *expr, struct linpool *tmp_pool, struct f_val *pres)
+f_eval(const struct f_line *expr, struct linpool *tmp_pool, struct f_val *pres)
{
- struct filter_state fs = {
+ filter_state = (struct filter_state) {
+ .stack = &filter_stack,
.pool = tmp_pool,
- .stack = filter_stack,
};
- LOG_BUFFER_INIT(fs.buf);
+ LOG_BUFFER_INIT(filter_state.buf);
- enum filter_return fret = interpret(&fs, expr);
- *pres = filter_stack[0].val;
+ 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 filter_state fs = {
+ filter_state = (struct filter_state) {
+ .stack = &filter_stack,
.pool = cfg_mem,
- .stack = filter_stack,
};
- LOG_BUFFER_INIT(fs.buf);
+ struct f_val val;
+
+ LOG_BUFFER_INIT(filter_state.buf);
- if (interpret(&fs, expr) > F_RETURN)
- cf_error("Runtime error while evaluating expression");
+ if (interpret(&filter_state, expr, &val) > F_RETURN)
+ cf_error("Runtime error while evaluating expression; see log for details");
- if (filter_stack[0].val.type != T_INT)
+ if (val.type != T_INT)
cf_error("Integer expression expected");
- return filter_stack[0].val.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