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-rw-r--r--filter/config.Y59
-rw-r--r--filter/data.c1
-rw-r--r--filter/data.h8
-rw-r--r--filter/decl.m469
-rw-r--r--filter/f-inst.c232
-rw-r--r--filter/f-inst.h1
-rw-r--r--filter/filter.c254
7 files changed, 260 insertions, 364 deletions
diff --git a/filter/config.Y b/filter/config.Y
index f57575fc..3898748c 100644
--- a/filter/config.Y
+++ b/filter/config.Y
@@ -21,13 +21,9 @@ static inline u32 pair(u32 a, u32 b) { return (a << 16) | b; }
static inline u32 pair_a(u32 p) { return p >> 16; }
static inline u32 pair_b(u32 p) { return p & 0xFFFF; }
-#define f_generate_complex(fi_code, _da, arg) ({ \
- struct f_inst *fi = f_new_inst(fi_code, f_new_inst(FI_EA_GET, _da), arg); \
- fi->result.type = F_LVAL_EA; \
- fi->result.da = _da; \
- fi; \
-})
-
+#define f_generate_complex(fi_code, da, arg) \
+ f_new_inst(FI_EA_SET, f_new_inst(fi_code, f_new_inst(FI_EA_GET, da), arg), da)
+
/*
* Sets and their items are during parsing handled as lists, linked
* through left ptr. The first item in a list also contains a pointer
@@ -188,10 +184,7 @@ f_generate_empty(struct f_dynamic_attr dyn)
cf_error("Can't empty that attribute");
}
- struct f_inst *fi = f_new_inst(FI_CONSTANT, empty);
- fi->result.type = F_LVAL_EA;
- fi->result.da = dyn;
- return fi;
+ return f_new_inst(FI_EA_SET, f_new_inst(FI_CONSTANT, empty), dyn);
}
#if 0
@@ -404,34 +397,31 @@ assert_done(struct f_inst *expr, const char *start, const char *end)
static struct f_inst *
assert_assign(struct f_lval *lval, struct f_inst *expr, const char *start, const char *end)
{
- struct f_inst *getter;
+ struct f_inst *setter, *getter, *checker;
switch (lval->type) {
- case F_LVAL_STACK:
- bug("This shall never happen");
- case F_LVAL_EXCEPTION:
- bug("This shall never happen");
case F_LVAL_VARIABLE:
+ setter = f_new_inst(FI_VAR_SET, expr, lval->sym);
getter = f_new_inst(FI_VAR_GET, lval->sym);
break;
case F_LVAL_PREFERENCE:
+ setter = f_new_inst(FI_PREF_SET, expr);
getter = f_new_inst(FI_PREF_GET);
break;
case F_LVAL_SA:
+ setter = f_new_inst(FI_RTA_SET, expr, lval->sa);
getter = f_new_inst(FI_RTA_GET, lval->sa);
break;
case F_LVAL_EA:
+ setter = f_new_inst(FI_EA_SET, expr, lval->da);
getter = f_new_inst(FI_EA_GET, lval->da);
break;
+ default:
+ bug("Unknown lval type");
}
- struct f_inst *checker = f_new_inst(FI_EQ, expr, getter);
-
- struct f_inst *setter = cfg_alloc(sizeof(struct f_inst));
- *setter = *expr;
-
+ checker = f_new_inst(FI_EQ, expr, getter);
setter->next = checker;
- setter->result = *lval;
-
+
return assert_done(setter, start, end);
}
@@ -995,40 +985,29 @@ cmd:
| CF_SYM_KNOWN '=' term ';' {
switch ($1->class) {
case SYM_VARIABLE_RANGE:
- $3->result.type = F_LVAL_VARIABLE;
- $3->result.sym = $1;
+ $$ = f_new_inst(FI_VAR_SET, $3, $1);
break;
case SYM_ATTRIBUTE:
- $3->result.type = F_LVAL_EA;
- $3->result.da = *$1->attribute;
+ $$ = f_new_inst(FI_EA_SET, $3, *$1->attribute);
break;
default:
cf_error("Can't assign to symbol %s", $1->name);
}
- $$ = $3;
}
| RETURN term ';' {
DBG( "Ook, we'll return the value\n" );
- $2->result.type = F_LVAL_EXCEPTION;
- $2->result.exception = FE_RETURN;
- $$ = $2;
+ $$ = f_new_inst(FI_RETURN, $2);
}
| dynamic_attr '=' term ';' {
- $3->result.type = F_LVAL_EA;
- $3->result.da = $1;
- $$ = $3;
+ $$ = f_new_inst(FI_EA_SET, $3, $1);
}
| static_attr '=' term ';' {
if ($1.readonly)
cf_error( "This static attribute is read-only.");
-
- $3->result.type = F_LVAL_SA;
- $3->result.sa = $1;
- $$ = $3;
+ $$ = f_new_inst(FI_RTA_SET, $3, $1);
}
| PREFERENCE '=' term ';' {
- $3->result.type = F_LVAL_PREFERENCE;
- $$ = $3;
+ $$ = f_new_inst(FI_PREF_SET, $3);
}
| UNSET '(' dynamic_attr ')' ';' {
$$ = f_new_inst(FI_EA_UNSET, $3);
diff --git a/filter/data.c b/filter/data.c
index cb759a59..912e2b00 100644
--- a/filter/data.c
+++ b/filter/data.c
@@ -525,3 +525,4 @@ val_dump(const struct f_val *v) {
val_format(v, &b);
return val_dump_buffer;
}
+
diff --git a/filter/data.h b/filter/data.h
index 3718cea4..6973008f 100644
--- a/filter/data.h
+++ b/filter/data.h
@@ -107,15 +107,8 @@ struct f_static_attr {
int readonly:1; /* Don't allow writing */
};
-/* Exception bits */
-enum f_exception {
- FE_RETURN = 0x1,
-};
-
/* Filter l-value type */
enum f_lval_type {
- F_LVAL_STACK = 0,
- F_LVAL_EXCEPTION,
F_LVAL_VARIABLE,
F_LVAL_PREFERENCE,
F_LVAL_SA,
@@ -126,7 +119,6 @@ enum f_lval_type {
struct f_lval {
enum f_lval_type type;
union {
- enum f_exception exception;
const struct symbol *sym;
struct f_dynamic_attr da;
struct f_static_attr sa;
diff --git a/filter/decl.m4 b/filter/decl.m4
index a1d625f3..9934d0ba 100644
--- a/filter/decl.m4
+++ b/filter/decl.m4
@@ -119,6 +119,8 @@ case INST_NAME(): {
m4_undivert(105)
#undef what
#undef item
+ dest->items[pos].fi_code = what_->fi_code;
+ dest->items[pos].lineno = what_->lineno;
break;
}
m4_undefine([[FID_LINEARIZE_BODY_EXISTS]])
@@ -234,29 +236,9 @@ do { if (whati->fl$1) {
} } while(0)m4_dnl
FID_ALL()')
-m4_define(RESULT_PTR, `
-FID_INTERPRET_BODY
- do {
- enum filter_return fret = f_lval_set(fs, &(what->result), $1);
- if (fret != F_NOP) return fret;
- } while (0)m4_dnl
-FID_ALL()')
-
-m4_define(RESULT, `
-FID_INTERPRET_BODY
- do {
- struct f_val res_ = { .type = $1, .val.$2 = $3 };
- RESULT_PTR(&res_);
- } while (0)m4_dnl
-FID_ALL()')
-
-m4_define(RESULT_VOID, `
-FID_INTERPRET_BODY
- do {
- struct f_val res_ = { .type = T_VOID };
- RESULT_PTR(&res_);
- } while (0)m4_dnl
-FID_ALL()')
+m4_define(RESULT_OK, `FID_INTERPRET_BODY()fstk->vcnt++FID_ALL()')
+m4_define(RESULT, `RESULT_VAL([[ (struct f_val) { .type = $1, .val.$2 = $3 } ]])')
+m4_define(RESULT_VAL, `FID_INTERPRET_BODY()do { res = $1; RESULT_OK; } while (0)FID_ALL()')
m4_define(SYMBOL, `FID_MEMBER(const struct symbol *, sym, sym,
[[strcmp(f1->sym->name, f2->sym->name) || (f1->sym->class != f2->sym->class)]], symbol %s, item->sym->name, const struct symbol *sym = whati->sym)')
@@ -320,16 +302,6 @@ void f_dump_line(const struct f_line *dest, uint indent)
for (uint i=0; i<dest->len; i++) {
const struct f_line_item *item = &dest->items[i];
debug("%sInstruction %s at line %u\n", INDENT, f_instruction_name(item->fi_code), item->lineno);
-
- switch (item->result.type) {
- case F_LVAL_STACK: debug("%son stack\n", INDENT); break;
- case F_LVAL_EXCEPTION: debug("%s=>exception 0x%x\n", INDENT, item->result.exception); break;
- case F_LVAL_VARIABLE: debug("%s=>%s\n", INDENT, item->result.sym->name); break;
- case F_LVAL_PREFERENCE: debug("%s=>preference\n", INDENT); break;
- case F_LVAL_SA: debug("%s=>sa\n", INDENT); break;
- case F_LVAL_EA: debug("%s=>ea\n", INDENT); break;
- }
-
switch (item->fi_code) {
FID_WR_PUT(7)
default: bug("Unknown instruction %x in f_dump_line", item->fi_code);
@@ -346,9 +318,6 @@ linearize(struct f_line *dest, const struct f_inst *what_, uint pos)
switch (what_->fi_code) {
FID_WR_PUT(8)
}
- dest->items[pos].fi_code = what_->fi_code;
- dest->items[pos].lineno = what_->lineno;
- dest->items[pos].result = what_->result;
pos++;
}
return pos;
@@ -391,32 +360,6 @@ f_same(const struct f_line *fl1, const struct f_line *fl2)
if (f1_->flags != f2_->flags)
return 0;
- if (f1_->result.type != f2_->result.type) return 0;
- switch (f1_->result.type) {
- case F_LVAL_STACK:
- break;
- case F_LVAL_EXCEPTION:
- if (f1_->result.exception != f2_->result.exception)
- return 0;
- break;
- case F_LVAL_VARIABLE:
- if (strcmp(f1_->result.sym->name, f2_->result.sym->name))
- return 0;
- if (f1_->result.sym->class != f2_->result.sym->class)
- return 0;
- break;
- case F_LVAL_PREFERENCE:
- break;
- case F_LVAL_SA:
- if (f1_->result.sa.sa_code != f2_->result.sa.sa_code)
- return 0;
- break;
- case F_LVAL_EA:
- if (f1_->result.da.ea_code != f2_->result.da.ea_code)
- return 0;
- break;
- }
-
switch(f1_->fi_code) {
FID_WR_PUT(9)
}
@@ -439,7 +382,6 @@ struct f_inst {
enum f_instruction_code fi_code; /* Instruction code */
int size; /* How many instructions are underneath */
int lineno; /* Line number */
- struct f_lval result; /* Destination */
union {
FID_WR_PUT(1)
};
@@ -450,7 +392,6 @@ struct f_line_item {
enum f_instruction_code fi_code; /* What to do */
enum f_instruction_flags flags; /* Flags, instruction-specific */
uint lineno; /* Where */
- struct f_lval result; /* Destination */
union {
FID_WR_PUT(2)
};
diff --git a/filter/f-inst.c b/filter/f-inst.c
index 3be76d11..749e072c 100644
--- a/filter/f-inst.c
+++ b/filter/f-inst.c
@@ -36,7 +36,7 @@
* m4_dnl ACCESS_RTE; this instruction needs route
* m4_dnl ACCESS_EATTRS; this instruction needs extended attributes
* m4_dnl RESULT(type, union-field, value); putting this on value stack
- * m4_dnl RESULT_PTR(vptr); put what is pointed-to on the value stack
+ * m4_dnl RESULT_OK; legalize what already is on the value stack
* m4_dnl }
*
* Other code is just copied into the interpreter part.
@@ -50,37 +50,41 @@
INST(FI_ADD, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
- RESULT(T_INT, i, v1.val.i + v2.val.i);
+ res.val.i += v2.val.i;
+ RESULT_OK;
}
INST(FI_SUBTRACT, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
- RESULT(T_INT, i, v1.val.i - v2.val.i);
+ res.val.i -= v2.val.i;
+ RESULT_OK;
}
INST(FI_MULTIPLY, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
- RESULT(T_INT, i, v1.val.i * v2.val.i);
+ res.val.i *= v2.val.i;
+ RESULT_OK;
}
INST(FI_DIVIDE, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
if (v2.val.i == 0) runtime( "Mother told me not to divide by 0" );
- RESULT(T_INT, i, v1.val.i / v2.val.i);
+ res.val.i /= v2.val.i;
+ RESULT_OK;
}
INST(FI_AND, 1, 1) {
ARG(1,T_BOOL);
- if (v1.val.i)
+ if (res.val.i)
LINE(2,0);
else
- RESULT_PTR(&(v1));
+ RESULT_OK;
}
INST(FI_OR, 1, 1) {
ARG(1,T_BOOL);
- if (!v1.val.i)
+ if (!res.val.i)
LINE(2,0);
else
- RESULT_PTR(&(v1));
+ RESULT_OK;
}
INST(FI_PAIR_CONSTRUCT, 2, 1) {
ARG(1,T_INT);
@@ -277,7 +281,8 @@
INST(FI_VAR_GET, 0, 1) {
SYMBOL(1);
- RESULT_PTR(&(fstk->vstk[curline.vbase + sym->offset]));
+ res = fstk->vstk[curline.vbase + sym->offset];
+ RESULT_OK;
}
/* some constants have value in a[1], some in *a[0].p, strange. */
@@ -298,7 +303,8 @@
debug("%svalue %s\n", INDENT, val_dump(&item->val));
FID_ALL
- RESULT_PTR(&(whati->val));
+ res = whati->val;
+ RESULT_OK;
}
INST(FI_CONSTANT_DEFINED, 0, 1) {
FID_STRUCT_IN
@@ -318,7 +324,8 @@
debug("%sconstant %s with value %s\n", INDENT, item->sym->name, val_dump(item->valp));
FID_ALL
- RESULT_PTR(whati->valp);
+ res = *whati->valp;
+ RESULT_OK;
}
INST(FI_PRINT, 1, 0) {
ARG_ANY(1);
@@ -391,6 +398,76 @@
}
}
+ INST(FI_RTA_SET, 1, 0) {
+ ACCESS_RTE;
+ ARG_ANY(1);
+ STATIC_ATTR;
+ if (sa.f_type != v1.type)
+ runtime( "Attempt to set static attribute to incompatible type" );
+
+ f_rta_cow(fs);
+ {
+ struct rta *rta = (*fs->rte)->attrs;
+
+ switch (sa.sa_code)
+ {
+ 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;
+
+ case SA_DEST:
+ {
+ int 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" );
+
+ 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 (%u/%u)", sa.f_type, sa.sa_code);
+ }
+ }
+ }
+
INST(FI_EA_GET, 0, 1) { /* Access to extended attributes */
DYNAMIC_ATTR;
ACCESS_RTE;
@@ -424,7 +501,8 @@
}
/* Undefined value */
- RESULT_VOID;
+ res.type = T_VOID;
+ RESULT_OK;
break;
}
@@ -457,7 +535,8 @@
RESULT(T_LCLIST, ad, e->u.ptr);
break;
case EAF_TYPE_UNDEF:
- RESULT_VOID;
+ res.type = T_VOID;
+ RESULT_OK;
break;
default:
bug("Unknown dynamic attribute type");
@@ -465,6 +544,95 @@
}
}
+ INST(FI_EA_SET, 1, 0) {
+ ACCESS_RTE;
+ ACCESS_EATTRS;
+ ARG_ANY(1);
+ DYNAMIC_ATTR;
+ {
+ struct ea_list *l = lp_alloc(fs->pool, sizeof(struct ea_list) + sizeof(eattr));
+
+ l->next = NULL;
+ l->flags = EALF_SORTED;
+ l->count = 1;
+ l->attrs[0].id = da.ea_code;
+ l->attrs[0].flags = 0;
+ l->attrs[0].type = da.type | EAF_ORIGINATED | EAF_FRESH;
+
+ switch (da.type) {
+ case EAF_TYPE_INT:
+ if (v1.type != da.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(fs->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(*fs->eattrs, da.ea_code);
+ u32 data = e ? e->u.data : 0;
+
+ if (v1.val.i)
+ l->attrs[0].u.data = data | (1u << da.bit);
+ else
+ l->attrs[0].u.data = data & ~(1u << da.bit);
+ }
+ 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;
+ default: bug("Unknown type in e,S");
+ }
+
+ f_rta_cow(fs);
+ l->next = *fs->eattrs;
+ *fs->eattrs = l;
+ }
+ }
+
INST(FI_EA_UNSET, 0, 0) {
DYNAMIC_ATTR;
ACCESS_RTE;
@@ -492,6 +660,15 @@
RESULT(T_INT, i, (*fs->rte)->pref);
}
+ INST(FI_PREF_SET, 1, 0) {
+ ACCESS_RTE;
+ ARG(1,T_INT);
+ if (v1.val.i > 0xFFFF)
+ runtime( "Setting preference value out of bounds" );
+ f_rte_cow(fs);
+ (*fs->rte)->pref = v1.val.i;
+ }
+
INST(FI_LENGTH, 1, 1) { /* Get length of */
ARG_ANY(1);
switch(v1.type) {
@@ -567,6 +744,33 @@
RESULT(T_INT, i, as_path_get_last_nonaggregated(v1.val.ad));
}
+ INST(FI_RETURN, 1, 1) {
+ /* Acquire the return value */
+ ARG_ANY(1);
+ uint retpos = fstk->vcnt;
+
+ /* Drop every sub-block including ourselves */
+ while ((fstk->ecnt-- > 0) && !(fstk->estk[fstk->ecnt].emask & FE_RETURN))
+ ;
+
+ /* Now we are at the caller frame; if no such, try to convert to accept/reject. */
+ if (!fstk->ecnt)
+ if (fstk->vstk[retpos].type == T_BOOL)
+ if (fstk->vstk[retpos].val.i)
+
+ return F_ACCEPT;
+ else
+ return F_REJECT;
+ else
+ runtime("Can't return non-bool from non-function");
+
+ /* Set the value stack position, overwriting the former implicit void */
+ fstk->vcnt = fstk->estk[fstk->ecnt].ventry - 1;
+
+ /* Copy the return value */
+ RESULT_VAL(fstk->vstk[retpos]);
+ }
+
INST(FI_CALL, 0, 1) {
SYMBOL;
diff --git a/filter/f-inst.h b/filter/f-inst.h
index ca685ded..f0dcec64 100644
--- a/filter/f-inst.h
+++ b/filter/f-inst.h
@@ -84,6 +84,7 @@ static inline struct f_dynamic_attr f_new_dynamic_attr(u8 type, u8 bit, enum f_t
{ return (struct f_dynamic_attr) { .type = type, .bit = bit, .f_type = f_type, .ea_code = code }; } /* f_type currently unused; will be handy for static type checking */
static inline struct f_static_attr f_new_static_attr(int f_type, int code, int readonly)
{ return (struct f_static_attr) { .f_type = f_type, .sa_code = code, .readonly = readonly }; }
+struct f_inst *f_generate_complex(enum f_instruction_code fi_code, struct f_dynamic_attr da, struct f_inst *argument);
struct f_inst *f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn);
/* Hook for call bt_assert() function in configuration */
diff --git a/filter/filter.c b/filter/filter.c
index 77378178..ee29522e 100644
--- a/filter/filter.c
+++ b/filter/filter.c
@@ -51,6 +51,12 @@
#include "filter/data.h"
+/* Exception bits */
+enum f_exception {
+ FE_RETURN = 0x1,
+};
+
+
struct filter_stack {
/* Value stack for execution */
#define F_VAL_STACK_MAX 4096
@@ -145,7 +151,7 @@ f_rta_cow(struct filter_state *fs)
}
static char *
-val_format_str(struct filter_state *fs, const struct f_val *v) {
+val_format_str(struct filter_state *fs, struct f_val *v) {
buffer b;
LOG_BUFFER_INIT(b);
val_format(v, &b);
@@ -154,233 +160,6 @@ val_format_str(struct filter_state *fs, const struct f_val *v) {
static struct tbf rl_runtime_err = TBF_DEFAULT_LOG_LIMITS;
-#define runtime(fmt, ...) do { \
- if (!(fs->flags & FF_SILENT)) \
- log_rl(&rl_runtime_err, L_ERR "filters, line %d: " fmt, \
- (fs->stack->estk[fs->stack->ecnt-1].line->items[fs->stack->estk[fs->stack->ecnt-1].pos-1]).lineno, \
- ##__VA_ARGS__); \
- return F_ERROR; \
-} while(0)
-
-#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)
-
-static inline enum filter_return
-f_rta_set(struct filter_state *fs, struct f_static_attr sa, const struct f_val *val)
-{
- ACCESS_RTE;
- if (sa.f_type != val->type)
- runtime( "Attempt to set static attribute to incompatible type" );
-
- f_rta_cow(fs);
- {
- struct rta *rta = (*fs->rte)->attrs;
-
- switch (sa.sa_code)
- {
- case SA_FROM:
- rta->from = val->val.ip;
- return F_NOP;
-
- case SA_GW:
- {
- ip_addr ip = val->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;
- }
- return F_NOP;
-
- case SA_SCOPE:
- rta->scope = val->val.i;
- return F_NOP;
-
- case SA_DEST:
- {
- int i = val->val.i;
- if ((i != RTD_BLACKHOLE) && (i != RTD_UNREACHABLE) && (i != RTD_PROHIBIT))
- runtime( "Destination can be changed only to blackhole, unreachable or prohibit" );
-
- rta->dest = i;
- rta->nh.gw = IPA_NONE;
- rta->nh.iface = NULL;
- rta->nh.next = NULL;
- rta->hostentry = NULL;
- }
- return F_NOP;
-
- case SA_IFNAME:
- {
- struct iface *ifa = if_find_by_name(val->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;
- }
- return F_NOP;
-
- default:
- bug("Invalid static attribute access (%u/%u)", sa.f_type, sa.sa_code);
- }
- }
-}
-
-static inline enum filter_return
-f_ea_set(struct filter_state *fs, struct f_dynamic_attr da, const struct f_val *val)
-{
- ACCESS_RTE;
- ACCESS_EATTRS;
- {
- struct ea_list *l = lp_alloc(fs->pool, sizeof(struct ea_list) + sizeof(eattr));
-
- l->next = NULL;
- l->flags = EALF_SORTED;
- l->count = 1;
- l->attrs[0].id = da.ea_code;
- l->attrs[0].flags = 0;
- l->attrs[0].type = da.type | EAF_ORIGINATED | EAF_FRESH;
-
- switch (da.type) {
- case EAF_TYPE_INT:
- if (val->type != da.f_type)
- runtime( "Setting int attribute to non-int value" );
- l->attrs[0].u.data = val->val.i;
- break;
-
- case EAF_TYPE_ROUTER_ID:
- /* IP->Quad implicit conversion */
- if (val_is_ip4(val)) {
- l->attrs[0].u.data = ipa_to_u32(val->val.ip);
- break;
- }
- /* T_INT for backward compatibility */
- if ((val->type != T_QUAD) && (val->type != T_INT))
- runtime( "Setting quad attribute to non-quad value" );
- l->attrs[0].u.data = val->val.i;
- break;
-
- case EAF_TYPE_OPAQUE:
- runtime( "Setting opaque attribute is not allowed" );
- break;
- case EAF_TYPE_IP_ADDRESS:
- if (val->type != T_IP)
- runtime( "Setting ip attribute to non-ip value" );
- int len = sizeof(ip_addr);
- struct adata *ad = lp_alloc(fs->pool, sizeof(struct adata) + len);
- ad->length = len;
- (* (ip_addr *) ad->data) = val->val.ip;
- l->attrs[0].u.ptr = ad;
- break;
- case EAF_TYPE_AS_PATH:
- if (val->type != T_PATH)
- runtime( "Setting path attribute to non-path value" );
- l->attrs[0].u.ptr = val->val.ad;
- break;
- case EAF_TYPE_BITFIELD:
- if (val->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(*fs->eattrs, da.ea_code);
- u32 data = e ? e->u.data : 0;
-
- if (val->val.i)
- l->attrs[0].u.data = data | (1u << da.bit);
- else
- l->attrs[0].u.data = data & ~(1u << da.bit);
- }
- break;
- case EAF_TYPE_INT_SET:
- if (val->type != T_CLIST)
- runtime( "Setting clist attribute to non-clist value" );
- l->attrs[0].u.ptr = val->val.ad;
- break;
- case EAF_TYPE_EC_SET:
- if (val->type != T_ECLIST)
- runtime( "Setting eclist attribute to non-eclist value" );
- l->attrs[0].u.ptr = val->val.ad;
- break;
- case EAF_TYPE_LC_SET:
- if (val->type != T_LCLIST)
- runtime( "Setting lclist attribute to non-lclist value" );
- l->attrs[0].u.ptr = val->val.ad;
- break;
- default: bug("Unknown type in e,S");
- }
-
- f_rta_cow(fs);
- l->next = *fs->eattrs;
- *fs->eattrs = l;
-
- return F_NOP;
- }
-}
-
-static inline enum filter_return
-f_lval_set(struct filter_state *fs, const struct f_lval *lv, const struct f_val *val)
-{
- switch (lv->type) {
- case F_LVAL_STACK:
- fs->stack->vstk[fs->stack->vcnt] = *val;
- fs->stack->vcnt++;
- return F_NOP;
- case F_LVAL_EXCEPTION:
- {
- /* Drop every sub-block including ourselves */
- while ((fs->stack->ecnt-- > 0) && !(fs->stack->estk[fs->stack->ecnt].emask & lv->exception))
- ;
-
- /* Now we are at the catch frame; if no such, try to convert to accept/reject. */
- if (!fs->stack->ecnt)
- if (lv->exception == FE_RETURN)
- if (val->type == T_BOOL)
- if (val->val.i)
- return F_ACCEPT;
- else
- return F_REJECT;
- else
- runtime("Can't return non-bool from non-function");
- else
- runtime("Unhandled exception 0x%x: %s", lv->exception, val_format_str(fs, val));
-
- /* Set the value stack position, overwriting the former implicit void */
- fs->stack->vcnt = fs->stack->estk[fs->stack->ecnt].ventry;
-
- /* Copy the return value */
- fs->stack->vstk[fs->stack->vcnt - 1] = *val;
- return F_NOP;
- }
- case F_LVAL_VARIABLE:
- fs->stack->vstk[fs->stack->estk[fs->stack->ecnt-1].vbase + lv->sym->offset] = *val;
- return F_NOP;
- case F_LVAL_PREFERENCE:
- ACCESS_RTE;
- if (val->type != T_INT)
- runtime("Preference must be integer, got 0x%02x", val->type);
- if (val->val.i > 0xFFFF)
- runtime("Preference is at most 65536");
- f_rte_cow(fs);
- (*fs->rte)->pref = val->val.i;
- return F_NOP;
- case F_LVAL_SA:
- return f_rta_set(fs, lv->sa, val);
- case F_LVAL_EA:
- return f_ea_set(fs, lv->da, val);
- default:
- bug("This shall never happen");
- }
-}
-
/**
* interpret
* @fs: filter state
@@ -430,6 +209,15 @@ interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
#define v2 fstk->vstk[fstk->vcnt + 1]
#define v3 fstk->vstk[fstk->vcnt + 2]
+#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 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
@@ -445,16 +233,6 @@ interpret(struct filter_state *fs, const struct f_line *line, struct f_val *val)
fstk->vcnt -= curline.line->vars;
fstk->vcnt -= curline.line->args;
fstk->ecnt--;
-
- /* If the caller wants to store the result somewhere, do it. */
- if (fstk->ecnt) {
- const struct f_line_item *caller = &(curline.line->items[curline.pos-1]);
- if (caller->result.type != F_LVAL_STACK) {
- enum filter_return fret = f_lval_set(fs, &(caller->result), &fstk->vstk[--fstk->vcnt]);
- if (fret != F_NOP)
- return fret;
- }
- }
}
if (fstk->vcnt == 0) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 13:29:24 +0000