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bird/filter/f-inst.c
Trisha Biswas e5468d1685 Filter: Add MPLS label route attribute 
Add support to set or read outgoing MPLS labels using filters. Currently
this supports the addition of one label per route for the first next hop.

Minor changes by committer.
2021-05-17 17:50:04 +02:00

1288 lines
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/*
* Filters: Instructions themselves
*
* Copyright 1998 Pavel Machek <pavel@ucw.cz>
* Copyright 2018 Maria Matejka <mq@jmq.cz>
* Copyright 2018 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
* The filter code goes through several phases:
*
* 1 Parsing
* Flex- and Bison-generated parser decodes the human-readable data into
* a struct f_inst tree. This is an infix tree that was interpreted by
* depth-first search execution in previous versions of the interpreter.
* All instructions have their constructor: f_new_inst(FI_EXAMPLE, ...)
* translates into f_new_inst_FI_EXAMPLE(...) and the types are checked in
* compile time. If the result of the instruction is always the same,
* it's reduced to FI_CONSTANT directly in constructor. This phase also
* counts how many instructions are underlying in means of f_line_item
* fields to know how much we have to allocate in the next phase.
*
* 2 Linearize before interpreting
* The infix tree is always interpreted in the same order. Therefore we
* sort the instructions one after another into struct f_line. Results
* and arguments of these instructions are implicitly put on a value
* stack; e.g. the + operation just takes two arguments from the value
* stack and puts the result on there.
*
* 3 Interpret
* The given line is put on a custom execution stack. If needed (FI_CALL,
* FI_SWITCH, FI_AND, FI_OR, FI_CONDITION, ...), another line is put on top
* of the stack; when that line finishes, the execution continues on the
* older lines on the stack where it stopped before.
*
* 4 Same
* On config reload, the filters have to be compared whether channel
* reload is needed or not. The comparison is done by comparing the
* struct f_line's recursively.
*
* The main purpose of this rework was to improve filter performance
* by making the interpreter non-recursive.
*
* The other outcome is concentration of instruction definitions to
* one place -- right here. You shall define your instruction only here
* and nowhere else.
*
* Beware. This file is interpreted by M4 macros. These macros
* may be more stupid than you could imagine. If something strange
* happens after changing this file, compare the results before and
* after your change (see the Makefile to find out where the results are)
* and see what really happened.
*
* This file is not directly a C source code -> it is a generator input
* for several C sources; every instruction block gets expanded into many
* different places.
*
* All the arguments are processed literally; if you need an argument including comma,
* you have to quote it by [[ ... ]]
*
* What is the syntax here?
* m4_dnl INST(FI_NOP, in, out) { enum value, input args, output args
* m4_dnl ARG(num, type); argument, its id (in data fields) and type accessible by v1, v2, v3
* m4_dnl ARG_ANY(num); argument with no type check accessible by v1, v2, v3
* m4_dnl VARARG; variable-length argument list; accessible by vv(i) and whati->varcount
* m4_dnl LINE(num, unused); this argument has to be converted to its own f_line
* m4_dnl SYMBOL; symbol handed from config
* m4_dnl STATIC_ATTR; static attribute definition
* m4_dnl DYNAMIC_ATTR; dynamic attribute definition
* m4_dnl RTC; route table config
* m4_dnl ACCESS_RTE; this instruction needs route
* m4_dnl ACCESS_EATTRS; this instruction needs extended attributes
*
* m4_dnl FID_MEMBER( custom instruction member
* m4_dnl C type, for storage in structs
* m4_dnl name, how the member is named
* m4_dnl comparator for same(), if different, this should be TRUE (CAVEAT)
* m4_dnl dump format string debug -> format string for bvsnprintf
* m4_dnl dump format args appropriate args
* m4_dnl )
*
* m4_dnl RESULT(type, union-field, value); putting this on value stack
* m4_dnl RESULT_VAL(value-struct); pass the struct f_val directly
* m4_dnl RESULT_VOID; return undef
* m4_dnl }
*
* Also note that the { ... } blocks are not respected by M4 at all.
* If you get weird unmatched-brace-pair errors, check what it generated and why.
* What is really considered as one instruction is not the { ... } block
* after m4_dnl INST() but all the code between them.
*
* Other code is just copied into the interpreter part.
*
* If you are satisfied with this, you don't need to read the following
* detailed description of what is really done with the instruction definitions.
*
* m4_dnl Now let's look under the cover. The code between each INST()
* m4_dnl is copied to several places, namely these (numbered by the M4 diversions
* m4_dnl used in filter/decl.m4):
*
* m4_dnl (102) struct f_inst *f_new_inst(FI_EXAMPLE [[ put it here ]])
* m4_dnl {
* m4_dnl ... (common code)
* m4_dnl (103) [[ put it here ]]
* m4_dnl ...
* m4_dnl if (all arguments are constant)
* m4_dnl (108) [[ put it here ]]
* m4_dnl }
* m4_dnl For writing directly to constructor argument list, use FID_NEW_ARGS.
* m4_dnl For computing something in constructor (103), use FID_NEW_BODY.
* m4_dnl For constant pre-interpretation (108), see below at FID_INTERPRET_BODY.
*
* m4_dnl struct f_inst {
* m4_dnl ... (common fields)
* m4_dnl union {
* m4_dnl struct {
* m4_dnl (101) [[ put it here ]]
* m4_dnl } i_FI_EXAMPLE;
* m4_dnl ...
* m4_dnl };
* m4_dnl };
* m4_dnl This structure is returned from constructor.
* m4_dnl For writing directly to this structure, use FID_STRUCT_IN.
*
* m4_dnl linearize(struct f_line *dest, const struct f_inst *what, uint pos) {
* m4_dnl ...
* m4_dnl switch (what->fi_code) {
* m4_dnl case FI_EXAMPLE:
* m4_dnl (105) [[ put it here ]]
* m4_dnl break;
* m4_dnl }
* m4_dnl }
* m4_dnl This is called when translating from struct f_inst to struct f_line_item.
* m4_dnl For accessing your custom instruction data, use following macros:
* m4_dnl whati -> for accessing (struct f_inst).i_FI_EXAMPLE
* m4_dnl item -> for accessing (struct f_line)[pos].i_FI_EXAMPLE
* m4_dnl For writing directly here, use FID_LINEARIZE_BODY.
*
* m4_dnl (107) struct f_line_item {
* m4_dnl ... (common fields)
* m4_dnl union {
* m4_dnl struct {
* m4_dnl (101) [[ put it here ]]
* m4_dnl } i_FI_EXAMPLE;
* m4_dnl ...
* m4_dnl };
* m4_dnl };
* m4_dnl The same as FID_STRUCT_IN (101) but for the other structure.
* m4_dnl This structure is returned from the linearizer (105).
* m4_dnl For writing directly to this structure, use FID_LINE_IN.
*
* m4_dnl f_dump_line_item_FI_EXAMPLE(const struct f_line_item *item, const int indent)
* m4_dnl {
* m4_dnl (104) [[ put it here ]]
* m4_dnl }
* m4_dnl This code dumps the instruction on debug. Note that the argument
* m4_dnl is the linearized instruction; if the instruction has arguments,
* m4_dnl their code has already been linearized and their value is taken
* m4_dnl from the value stack.
* m4_dnl For writing directly here, use FID_DUMP_BODY.
*
* m4_dnl f_same(...)
* m4_dnl {
* m4_dnl switch (f1_->fi_code) {
* m4_dnl case FI_EXAMPLE:
* m4_dnl (106) [[ put it here ]]
* m4_dnl break;
* m4_dnl }
* m4_dnl }
* m4_dnl This code compares the two given instrucions (f1_ and f2_)
* m4_dnl on reconfigure. For accessing your custom instruction data,
* m4_dnl use macros f1 and f2.
* m4_dnl For writing directly here, use FID_SAME_BODY.
*
* m4_dnl f_add_lines(...)
* m4_dnl {
* m4_dnl switch (what_->fi_code) {
* m4_dnl case FI_EXAMPLE:
* m4_dnl (109) [[ put it here ]]
* m4_dnl break;
* m4_dnl }
* m4_dnl }
* m4_dnl This code adds new filter lines reachable from the instruction
* m4_dnl to the filter iterator line buffer. This is for instructions
* m4_dnl that changes conrol flow, like FI_CONDITION or FI_CALL, most
* m4_dnl instructions do not need to update it. It is used in generic
* m4_dnl filter iteration code (FILTER_ITERATE*). For accessing your
* m4_dnl custom instruction data, use macros f1 and f2. For writing
* m4_dnl directly here, use FID_ITERATE_BODY.
*
* m4_dnl interpret(...)
* m4_dnl {
* m4_dnl switch (what->fi_code) {
* m4_dnl case FI_EXAMPLE:
* m4_dnl (108) [[ put it here ]]
* m4_dnl break;
* m4_dnl }
* m4_dnl }
* m4_dnl This code executes the instruction. Every pre-defined macro
* m4_dnl resets the output here. For setting it explicitly,
* m4_dnl use FID_INTERPRET_BODY.
* m4_dnl This code is put on two places; one is the interpreter, the other
* m4_dnl is instruction constructor. If you need to distinguish between
* m4_dnl these two, use FID_INTERPRET_EXEC or FID_INTERPRET_NEW respectively.
* m4_dnl To address the difference between interpreter and constructor
* m4_dnl environments, there are several convenience macros defined:
* m4_dnl runtime() -> for spitting out runtime error like division by zero
* m4_dnl RESULT(...) -> declare result; may overwrite arguments
* m4_dnl v1, v2, v3 -> positional arguments, may be overwritten by RESULT()
* m4_dnl falloc(size) -> allocate memory from the appropriate linpool
* m4_dnl fpool -> the current linpool
* m4_dnl NEVER_CONSTANT-> don't generate pre-interpretation code at all
* m4_dnl ACCESS_RTE -> check that route is available, also NEVER_CONSTANT
* m4_dnl ACCESS_EATTRS -> pre-cache the eattrs; use only with ACCESS_RTE
* m4_dnl f_rta_cow(fs) -> function to call before any change to route should be done
*
* m4_dnl If you are stymied, see FI_CALL or FI_CONSTANT or just search for
* m4_dnl the mentioned macros in this file to see what is happening there in wild.
*/
/* Binary operators */
INST(FI_ADD, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
RESULT(T_INT, i, v1.val.i + v2.val.i);
}
INST(FI_SUBTRACT, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
RESULT(T_INT, i, v1.val.i - v2.val.i);
}
INST(FI_MULTIPLY, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
RESULT(T_INT, i, v1.val.i * v2.val.i);
}
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);
}
INST(FI_AND, 1, 1) {
ARG(1,T_BOOL);
ARG_TYPE_STATIC(2,T_BOOL);
RESULT_TYPE(T_BOOL);
if (v1.val.i)
LINE(2,0);
else
RESULT_VAL(v1);
}
INST(FI_OR, 1, 1) {
ARG(1,T_BOOL);
ARG_TYPE_STATIC(2,T_BOOL);
RESULT_TYPE(T_BOOL);
if (!v1.val.i)
LINE(2,0);
else
RESULT_VAL(v1);
}
INST(FI_PAIR_CONSTRUCT, 2, 1) {
ARG(1,T_INT);
ARG(2,T_INT);
uint u1 = v1.val.i;
uint u2 = v2.val.i;
if ((u1 > 0xFFFF) || (u2 > 0xFFFF))
runtime( "Can't operate with value out of bounds in pair constructor" );
RESULT(T_PAIR, i, (u1 << 16) | u2);
}
INST(FI_EC_CONSTRUCT, 2, 1) {
ARG_ANY(1);
ARG(2, T_INT);
FID_MEMBER(enum ec_subtype, ecs, f1->ecs != f2->ecs, "ec subtype %s", ec_subtype_str(item->ecs));
int 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("Argument 1 of EC constructor must be integer or IPv4 address, got 0x%02x", v1.type);
val = v2.val.i;
if (ecs == EC_GENERIC)
RESULT(T_EC, ec, ec_generic(key, val));
else if (ipv4_used)
if (val <= 0xFFFF)
RESULT(T_EC, ec, ec_ip4(ecs, key, val));
else
runtime("4-byte value %u can't be used with IP-address key in extended community", val);
else if (key < 0x10000)
RESULT(T_EC, ec, ec_as2(ecs, key, val));
else
if (val <= 0xFFFF)
RESULT(T_EC, ec, ec_as4(ecs, key, val));
else
runtime("4-byte value %u can't be used with 4-byte ASN in extended community", val);
}
INST(FI_LC_CONSTRUCT, 3, 1) {
ARG(1, T_INT);
ARG(2, T_INT);
ARG(3, T_INT);
RESULT(T_LC, lc, [[(lcomm) { v1.val.i, v2.val.i, v3.val.i }]]);
}
INST(FI_PATHMASK_CONSTRUCT, 0, 1) {
VARARG;
struct f_path_mask *pm = falloc(sizeof(struct f_path_mask) + whati->varcount * sizeof(struct f_path_mask_item));
pm->len = whati->varcount;
for (uint i=0; i<whati->varcount; i++) {
switch (vv(i).type) {
case T_PATH_MASK_ITEM:
if (vv(i).val.pmi.kind == PM_LOOP)
{
if (i == 0)
runtime("Path mask iterator '+' cannot be first");
/* We want PM_LOOP as prefix operator */
pm->item[i] = pm->item[i - 1];
pm->item[i - 1] = vv(i).val.pmi;
break;
}
pm->item[i] = vv(i).val.pmi;
break;
case T_INT:
pm->item[i] = (struct f_path_mask_item) {
.asn = vv(i).val.i,
.kind = PM_ASN,
};
break;
case T_SET:
if (vv(i).val.t->from.type != T_INT)
runtime("Only integer sets allowed in path mask");
pm->item[i] = (struct f_path_mask_item) {
.set = vv(i).val.t,
.kind = PM_ASN_SET,
};
break;
default:
runtime( "Error resolving path mask template: value not an integer" );
}
}
RESULT(T_PATH_MASK, path_mask, pm);
}
/* Relational operators */
INST(FI_NEQ, 2, 1) {
ARG_ANY(1);
ARG_ANY(2);
RESULT(T_BOOL, i, !val_same(&v1, &v2));
}
INST(FI_EQ, 2, 1) {
ARG_ANY(1);
ARG_ANY(2);
RESULT(T_BOOL, i, val_same(&v1, &v2));
}
INST(FI_LT, 2, 1) {
ARG_ANY(1);
ARG_ANY(2);
ARG_SAME_TYPE(1, 2);
int i = val_compare(&v1, &v2);
if (i == F_CMP_ERROR)
runtime( "Can't compare values of incompatible types" );
RESULT(T_BOOL, i, (i == -1));
}
INST(FI_LTE, 2, 1) {
ARG_ANY(1);
ARG_ANY(2);
ARG_SAME_TYPE(1, 2);
int i = val_compare(&v1, &v2);
if (i == F_CMP_ERROR)
runtime( "Can't compare values of incompatible types" );
RESULT(T_BOOL, i, (i != 1));
}
INST(FI_NOT, 1, 1) {
ARG(1,T_BOOL);
RESULT(T_BOOL, i, !v1.val.i);
}
INST(FI_MATCH, 2, 1) {
ARG_ANY(1);
ARG_ANY(2);
int i = val_in_range(&v1, &v2);
if (i == F_CMP_ERROR)
runtime( "~ applied on unknown type pair" );
RESULT(T_BOOL, i, !!i);
}
INST(FI_NOT_MATCH, 2, 1) {
ARG_ANY(1);
ARG_ANY(2);
int i = val_in_range(&v1, &v2);
if (i == F_CMP_ERROR)
runtime( "!~ applied on unknown type pair" );
RESULT(T_BOOL, i, !i);
}
INST(FI_DEFINED, 1, 1) {
ARG_ANY(1);
RESULT(T_BOOL, i, (v1.type != T_VOID) && !undef_value(v1));
}
INST(FI_TYPE, 1, 1) {
ARG_ANY(1); /* There may be more types supporting this operation */
switch (v1.type)
{
case T_NET:
RESULT(T_ENUM_NETTYPE, i, v1.val.net->type);
break;
default:
runtime( "Can't determine type of this item" );
}
}
INST(FI_IS_V4, 1, 1) {
ARG(1, T_IP);
RESULT(T_BOOL, i, ipa_is_ip4(v1.val.ip));
}
/* Set to indirect value prepared in v1 */
INST(FI_VAR_SET, 1, 0) {
NEVER_CONSTANT;
ARG_ANY(1);
SYMBOL;
ARG_TYPE(1, sym->class & 0xff);
fstk->vstk[curline.vbase + sym->offset] = v1;
}
INST(FI_VAR_GET, 0, 1) {
SYMBOL;
NEVER_CONSTANT;
RESULT_TYPE(sym->class & 0xff);
RESULT_VAL(fstk->vstk[curline.vbase + sym->offset]);
}
INST(FI_CONSTANT, 0, 1) {
FID_MEMBER(
struct f_val,
val,
[[ !val_same(&(f1->val), &(f2->val)) ]],
"value %s",
val_dump(&(item->val))
);
RESULT_TYPE(val.type);
RESULT_VAL(val);
}
INST(FI_CONDITION, 1, 0) {
ARG(1, T_BOOL);
if (v1.val.i)
LINE(2,0);
else
LINE(3,1);
}
INST(FI_PRINT, 0, 0) {
NEVER_CONSTANT;
VARARG;
if (whati->varcount && !(fs->flags & FF_SILENT))
for (uint i=0; i<whati->varcount; i++)
val_format(&(vv(i)), &fs->buf);
}
INST(FI_FLUSH, 0, 0) {
NEVER_CONSTANT;
if (!(fs->flags & FF_SILENT))
/* After log_commit, the buffer is reset */
log_commit(*L_INFO, &fs->buf);
}
INST(FI_DIE, 0, 0) {
NEVER_CONSTANT;
FID_MEMBER(enum filter_return, fret, f1->fret != f2->fret, "%s", filter_return_str(item->fret));
switch (whati->fret) {
case F_ACCEPT: /* Should take care about turning ACCEPT into MODIFY */
case F_ERROR:
case F_REJECT: /* Maybe print complete route along with reason to reject route? */
return fret; /* We have to return now, no more processing. */
default:
bug( "unknown return type: Can't happen");
}
}
INST(FI_RTA_GET, 0, 1) {
{
STATIC_ATTR;
ACCESS_RTE;
struct rta *rta = (*fs->rte)->attrs;
switch (sa.sa_code)
{
case SA_FROM: RESULT(sa.f_type, ip, rta->from); break;
case SA_GW: RESULT(sa.f_type, ip, rta->nh.gw); break;
case SA_NET: RESULT(sa.f_type, net, (*fs->rte)->net->n.addr); break;
case SA_PROTO: RESULT(sa.f_type, s, rta->src->proto->name); break;
case SA_SOURCE: RESULT(sa.f_type, i, rta->source); break;
case SA_SCOPE: RESULT(sa.f_type, i, rta->scope); break;
case SA_DEST: RESULT(sa.f_type, i, rta->dest); break;
case SA_IFNAME: RESULT(sa.f_type, s, rta->nh.iface ? rta->nh.iface->name : ""); break;
case SA_IFINDEX: RESULT(sa.f_type, i, rta->nh.iface ? rta->nh.iface->index : 0); break;
case SA_WEIGHT: RESULT(sa.f_type, i, rta->nh.weight + 1); break;
case SA_GW_MPLS: RESULT(sa.f_type, i, rta->nh.labels ? rta->nh.label[0] : MPLS_NULL); break;
default:
bug("Invalid static attribute access (%u/%u)", sa.f_type, sa.sa_code);
}
}
}
INST(FI_RTA_SET, 1, 0) {
ACCESS_RTE;
ARG_ANY(1);
STATIC_ATTR;
ARG_TYPE(1, sa.f_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;
struct iface *ifa = ipa_is_link_local(ip) ? rta->nh.iface : NULL;
neighbor *n = neigh_find(rta->src->proto, ip, ifa, 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;
rta->nh.labels = 0;
}
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;
rta->nh.labels = 0;
}
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;
rta->nh.labels = 0;
}
break;
case SA_GW_MPLS:
{
if (v1.val.i >= 0x100000)
runtime( "Invalid MPLS label" );
if (v1.val.i != MPLS_NULL)
{
rta->nh.label[0] = v1.val.i;
rta->nh.labels = 1;
}
else
rta->nh.labels = 0;
}
break;
case SA_WEIGHT:
{
int i = v1.val.i;
if (i < 1 || i > 256)
runtime( "Setting weight value out of bounds" );
if (rta->dest != RTD_UNICAST)
runtime( "Setting weight needs regular nexthop " );
/* Set weight on all next hops */
for (struct nexthop *nh = &rta->nh; nh; nh = nh->next)
nh->weight = i - 1;
}
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;
ACCESS_EATTRS;
RESULT_TYPE(da.f_type);
{
eattr *e = ea_find(*fs->eattrs, da.ea_code);
if (!e) {
/* A special case: undefined as_path looks like empty as_path */
if (da.type == EAF_TYPE_AS_PATH) {
RESULT_(T_PATH, ad, &null_adata);
break;
}
/* The same special case for int_set */
if (da.type == EAF_TYPE_INT_SET) {
RESULT_(T_CLIST, ad, &null_adata);
break;
}
/* The same special case for ec_set */
if (da.type == EAF_TYPE_EC_SET) {
RESULT_(T_ECLIST, ad, &null_adata);
break;
}
/* The same special case for lc_set */
if (da.type == EAF_TYPE_LC_SET) {
RESULT_(T_LCLIST, ad, &null_adata);
break;
}
/* Undefined value */
RESULT_VOID;
break;
}
switch (e->type & EAF_TYPE_MASK) {
case EAF_TYPE_INT:
RESULT_(da.f_type, i, e->u.data);
break;
case EAF_TYPE_ROUTER_ID:
RESULT_(T_QUAD, i, e->u.data);
break;
case EAF_TYPE_OPAQUE:
RESULT_(T_ENUM_EMPTY, i, 0);
break;
case EAF_TYPE_IP_ADDRESS:
RESULT_(T_IP, ip, *((ip_addr *) e->u.ptr->data));
break;
case EAF_TYPE_AS_PATH:
RESULT_(T_PATH, ad, e->u.ptr);
break;
case EAF_TYPE_BITFIELD:
RESULT_(T_BOOL, i, !!(e->u.data & (1u << da.bit)));
break;
case EAF_TYPE_INT_SET:
RESULT_(T_CLIST, ad, e->u.ptr);
break;
case EAF_TYPE_EC_SET:
RESULT_(T_ECLIST, ad, e->u.ptr);
break;
case EAF_TYPE_LC_SET:
RESULT_(T_LCLIST, ad, e->u.ptr);
break;
case EAF_TYPE_UNDEF:
RESULT_VOID;
break;
default:
bug("Unknown dynamic attribute type");
}
}
}
INST(FI_EA_SET, 1, 0) {
ACCESS_RTE;
ACCESS_EATTRS;
ARG_ANY(1);
DYNAMIC_ATTR;
ARG_TYPE(1, da.f_type);
{
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:
case EAF_TYPE_ROUTER_ID:
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:;
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:
case EAF_TYPE_INT_SET:
case EAF_TYPE_EC_SET:
case EAF_TYPE_LC_SET:
l->attrs[0].u.ptr = v1.val.ad;
break;
case EAF_TYPE_BITFIELD:
{
/* 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;
default:
bug("Unknown dynamic attribute type");
}
f_rta_cow(fs);
l->next = *fs->eattrs;
*fs->eattrs = l;
}
}
INST(FI_EA_UNSET, 0, 0) {
DYNAMIC_ATTR;
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 = EAF_TYPE_UNDEF | EAF_ORIGINATED | EAF_FRESH;
l->attrs[0].u.data = 0;
f_rta_cow(fs);
l->next = *fs->eattrs;
*fs->eattrs = l;
}
}
INST(FI_PREF_GET, 0, 1) {
ACCESS_RTE;
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) {
case T_NET: RESULT(T_INT, i, net_pxlen(v1.val.net)); break;
case T_PATH: RESULT(T_INT, i, as_path_getlen(v1.val.ad)); break;
case T_CLIST: RESULT(T_INT, i, int_set_get_size(v1.val.ad)); break;
case T_ECLIST: RESULT(T_INT, i, ec_set_get_size(v1.val.ad)); break;
case T_LCLIST: RESULT(T_INT, i, lc_set_get_size(v1.val.ad)); break;
default: runtime( "Prefix, path, clist or eclist expected" );
}
}
INST(FI_NET_SRC, 1, 1) { /* Get src prefix */
ARG(1, T_NET);
net_addr_union *net = (void *) v1.val.net;
net_addr *src = falloc(sizeof(net_addr_ip6));
const byte *part;
switch(v1.val.net->type) {
case NET_FLOW4:
part = flow4_get_part(&net->flow4, FLOW_TYPE_SRC_PREFIX);
if (part)
net_fill_ip4(src, flow_read_ip4_part(part), flow_read_pxlen(part));
else
net_fill_ip4(src, IP4_NONE, 0);
break;
case NET_FLOW6:
part = flow6_get_part(&net->flow6, FLOW_TYPE_SRC_PREFIX);
if (part)
net_fill_ip6(src, flow_read_ip6_part(part), flow_read_pxlen(part));
else
net_fill_ip6(src, IP6_NONE, 0);
break;
case NET_IP6_SADR:
net_fill_ip6(src, net->ip6_sadr.src_prefix, net->ip6_sadr.src_pxlen);
break;
default:
runtime( "Flow or SADR expected" );
}
RESULT(T_NET, net, src);
}
INST(FI_NET_DST, 1, 1) { /* Get dst prefix */
ARG(1, T_NET);
net_addr_union *net = (void *) v1.val.net;
net_addr *dst = falloc(sizeof(net_addr_ip6));
const byte *part;
switch(v1.val.net->type) {
case NET_FLOW4:
part = flow4_get_part(&net->flow4, FLOW_TYPE_DST_PREFIX);
if (part)
net_fill_ip4(dst, flow_read_ip4_part(part), flow_read_pxlen(part));
else
net_fill_ip4(dst, IP4_NONE, 0);
break;
case NET_FLOW6:
part = flow6_get_part(&net->flow6, FLOW_TYPE_DST_PREFIX);
if (part)
net_fill_ip6(dst, flow_read_ip6_part(part), flow_read_pxlen(part));
else
net_fill_ip6(dst, IP6_NONE, 0);
break;
case NET_IP6_SADR:
net_fill_ip6(dst, net->ip6_sadr.dst_prefix, net->ip6_sadr.dst_pxlen);
break;
default:
runtime( "Flow or SADR expected" );
}
RESULT(T_NET, net, dst);
}
INST(FI_ROA_MAXLEN, 1, 1) { /* Get ROA max prefix length */
ARG(1, T_NET);
if (!net_is_roa(v1.val.net))
runtime( "ROA expected" );
RESULT(T_INT, i, (v1.val.net->type == NET_ROA4) ?
((net_addr_roa4 *) v1.val.net)->max_pxlen :
((net_addr_roa6 *) v1.val.net)->max_pxlen);
}
INST(FI_ROA_ASN, 1, 1) { /* Get ROA ASN */
ARG(1, T_NET);
if (!net_is_roa(v1.val.net))
runtime( "ROA expected" );
RESULT(T_INT, i, (v1.val.net->type == NET_ROA4) ?
((net_addr_roa4 *) v1.val.net)->asn :
((net_addr_roa6 *) v1.val.net)->asn);
}
INST(FI_IP, 1, 1) { /* Convert prefix to ... */
ARG(1, T_NET);
RESULT(T_IP, ip, net_prefix(v1.val.net));
}
INST(FI_ROUTE_DISTINGUISHER, 1, 1) {
ARG(1, T_NET);
if (!net_is_vpn(v1.val.net))
runtime( "VPN address expected" );
RESULT(T_RD, ec, net_rd(v1.val.net));
}
INST(FI_AS_PATH_FIRST, 1, 1) { /* Get first ASN from AS PATH */
ARG(1, T_PATH);
u32 as = 0;
as_path_get_first(v1.val.ad, &as);
RESULT(T_INT, i, as);
}
INST(FI_AS_PATH_LAST, 1, 1) { /* Get last ASN from AS PATH */
ARG(1, T_PATH);
u32 as = 0;
as_path_get_last(v1.val.ad, &as);
RESULT(T_INT, i, as);
}
INST(FI_AS_PATH_LAST_NAG, 1, 1) { /* Get last ASN from non-aggregated part of AS PATH */
ARG(1, T_PATH);
RESULT(T_INT, i, as_path_get_last_nonaggregated(v1.val.ad));
}
INST(FI_RETURN, 1, 1) {
NEVER_CONSTANT;
/* Acquire the return value */
ARG_ANY(1);
uint retpos = fstk->vcnt;
/* Drop every sub-block including ourselves */
do fstk->ecnt--;
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)
return (fstk->vstk[retpos].val.i) ? F_ACCEPT : 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) {
NEVER_CONSTANT;
SYMBOL;
FID_SAME_BODY()
if (!(f1->sym->flags & SYM_FLAG_SAME))
return 0;
FID_ITERATE_BODY()
BUFFER_PUSH(fit->lines) = whati->sym->function;
FID_INTERPRET_BODY()
/* Push the body on stack */
LINEX(sym->function);
curline.emask |= FE_RETURN;
/* Before this instruction was called, there was the T_VOID
* automatic return value pushed on value stack and also
* sym->function->args function arguments. Setting the
* vbase to point to first argument. */
ASSERT(curline.ventry >= sym->function->args);
curline.ventry -= sym->function->args;
curline.vbase = curline.ventry;
/* Storage for local variables */
memset(&(fstk->vstk[fstk->vcnt]), 0, sizeof(struct f_val) * sym->function->vars);
fstk->vcnt += sym->function->vars;
}
INST(FI_DROP_RESULT, 1, 0) {
NEVER_CONSTANT;
ARG_ANY(1);
}
INST(FI_SWITCH, 1, 0) {
ARG_ANY(1);
FID_MEMBER(struct f_tree *, tree, [[!same_tree(f1->tree, f2->tree)]], "tree %p", item->tree);
FID_ITERATE_BODY()
tree_walk(whati->tree, f_add_tree_lines, fit);
FID_INTERPRET_BODY()
const struct f_tree *t = find_tree(tree, &v1);
if (!t) {
v1.type = T_VOID;
t = find_tree(tree, &v1);
if (!t) {
debug( "No else statement?\n");
FID_HIC(,break,return NULL);
}
}
/* It is actually possible to have t->data NULL */
LINEX(t->data);
}
INST(FI_IP_MASK, 2, 1) { /* IP.MASK(val) */
ARG(1, T_IP);
ARG(2, T_INT);
RESULT(T_IP, 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))) ]]);
}
INST(FI_PATH_PREPEND, 2, 1) { /* Path prepend */
ARG(1, T_PATH);
ARG(2, T_INT);
RESULT(T_PATH, ad, [[ as_path_prepend(fpool, v1.val.ad, v2.val.i) ]]);
}
INST(FI_CLIST_ADD, 2, 1) { /* (Extended) Community list add */
ARG_ANY(1);
ARG_ANY(2);
RESULT_TYPE(f1->type);
if (v1.type == T_PATH)
runtime("Can't add to path");
else if (v1.type == T_CLIST)
{
/* Community (or cluster) list */
struct f_val dummy;
if ((v2.type == T_PAIR) || (v2.type == T_QUAD))
RESULT_(T_CLIST, ad, [[ int_set_add(fpool, v1.val.ad, v2.val.i) ]]);
/* IP->Quad implicit conversion */
else if (val_is_ip4(&v2))
RESULT_(T_CLIST, ad, [[ int_set_add(fpool, v1.val.ad, ipa_to_u32(v2.val.ip)) ]]);
else if ((v2.type == T_SET) && clist_set_type(v2.val.t, &dummy))
runtime("Can't add set");
else if (v2.type == T_CLIST)
RESULT_(T_CLIST, ad, [[ int_set_union(fpool, v1.val.ad, v2.val.ad) ]]);
else
runtime("Can't add non-pair");
}
else if (v1.type == T_ECLIST)
{
/* v2.val is either EC or EC-set */
if ((v2.type == T_SET) && eclist_set_type(v2.val.t))
runtime("Can't add set");
else if (v2.type == T_ECLIST)
RESULT_(T_ECLIST, ad, [[ ec_set_union(fpool, v1.val.ad, v2.val.ad) ]]);
else if (v2.type != T_EC)
runtime("Can't add non-ec");
else
RESULT_(T_ECLIST, ad, [[ ec_set_add(fpool, v1.val.ad, v2.val.ec) ]]);
}
else if (v1.type == T_LCLIST)
{
/* v2.val is either LC or LC-set */
if ((v2.type == T_SET) && lclist_set_type(v2.val.t))
runtime("Can't add set");
else if (v2.type == T_LCLIST)
RESULT_(T_LCLIST, ad, [[ lc_set_union(fpool, v1.val.ad, v2.val.ad) ]]);
else if (v2.type != T_LC)
runtime("Can't add non-lc");
else
RESULT_(T_LCLIST, ad, [[ lc_set_add(fpool, v1.val.ad, v2.val.lc) ]]);
}
else
runtime("Can't add to non-[e|l]clist");
}
INST(FI_CLIST_DEL, 2, 1) { /* (Extended) Community list add or delete */
ARG_ANY(1);
ARG_ANY(2);
RESULT_TYPE(f1->type);
if (v1.type == T_PATH)
{
const struct f_tree *set = NULL;
u32 key = 0;
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)");
RESULT_(T_PATH, ad, [[ as_path_filter(fpool, v1.val.ad, set, key, 0) ]]);
}
else if (v1.type == T_CLIST)
{
/* Community (or cluster) list */
struct f_val dummy;
if ((v2.type == T_PAIR) || (v2.type == T_QUAD))
RESULT_(T_CLIST, ad, [[ int_set_del(fpool, v1.val.ad, v2.val.i) ]]);
/* IP->Quad implicit conversion */
else if (val_is_ip4(&v2))
RESULT_(T_CLIST, ad, [[ int_set_del(fpool, v1.val.ad, ipa_to_u32(v2.val.ip)) ]]);
else if ((v2.type == T_SET) && clist_set_type(v2.val.t, &dummy) || (v2.type == T_CLIST))
RESULT_(T_CLIST, ad, [[ clist_filter(fpool, v1.val.ad, &v2, 0) ]]);
else
runtime("Can't delete non-pair");
}
else if (v1.type == T_ECLIST)
{
/* v2.val is either EC or EC-set */
if ((v2.type == T_SET) && eclist_set_type(v2.val.t) || (v2.type == T_ECLIST))
RESULT_(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
else if (v2.type != T_EC)
runtime("Can't delete non-ec");
else
RESULT_(T_ECLIST, ad, [[ ec_set_del(fpool, v1.val.ad, v2.val.ec) ]]);
}
else if (v1.type == T_LCLIST)
{
/* v2.val is either LC or LC-set */
if ((v2.type == T_SET) && lclist_set_type(v2.val.t) || (v2.type == T_LCLIST))
RESULT_(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 0) ]]);
else if (v2.type != T_LC)
runtime("Can't delete non-lc");
else
RESULT_(T_LCLIST, ad, [[ lc_set_del(fpool, v1.val.ad, v2.val.lc) ]]);
}
else
runtime("Can't delete in non-[e|l]clist");
}
INST(FI_CLIST_FILTER, 2, 1) { /* (Extended) Community list add or delete */
ARG_ANY(1);
ARG_ANY(2);
RESULT_TYPE(f1->type);
if (v1.type == T_PATH)
{
u32 key = 0;
if ((v2.type == T_SET) && (v2.val.t->from.type == T_INT))
RESULT_(T_PATH, ad, [[ as_path_filter(fpool, v1.val.ad, v2.val.t, key, 1) ]]);
else
runtime("Can't filter integer");
}
else if (v1.type == T_CLIST)
{
/* Community (or cluster) list */
struct f_val dummy;
if ((v2.type == T_SET) && clist_set_type(v2.val.t, &dummy) || (v2.type == T_CLIST))
RESULT_(T_CLIST, ad, [[ clist_filter(fpool, v1.val.ad, &v2, 1) ]]);
else
runtime("Can't filter pair");
}
else if (v1.type == T_ECLIST)
{
/* v2.val is either EC or EC-set */
if ((v2.type == T_SET) && eclist_set_type(v2.val.t) || (v2.type == T_ECLIST))
RESULT_(T_ECLIST, ad, [[ eclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
else
runtime("Can't filter ec");
}
else if (v1.type == T_LCLIST)
{
/* v2.val is either LC or LC-set */
if ((v2.type == T_SET) && lclist_set_type(v2.val.t) || (v2.type == T_LCLIST))
RESULT_(T_LCLIST, ad, [[ lclist_filter(fpool, v1.val.ad, &v2, 1) ]]);
else
runtime("Can't filter lc");
}
else
runtime("Can't filter non-[e|l]clist");
}
INST(FI_ROA_CHECK_IMPLICIT, 0, 1) { /* ROA Check */
NEVER_CONSTANT;
RTC(1);
struct rtable *table = rtc->table;
ACCESS_RTE;
ACCESS_EATTRS;
const net_addr *net = (*fs->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(*fs->eattrs, EA_CODE(PROTOCOL_BGP, 0x02));
if (!e || ((e->type & EAF_TYPE_MASK) != EAF_TYPE_AS_PATH))
runtime("Missing AS_PATH attribute");
u32 as = 0;
as_path_get_last(e->u.ptr, &as);
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");
if (table->addr_type != (net->type == NET_IP4 ? NET_ROA4 : NET_ROA6))
RESULT(T_ENUM_ROA, i, ROA_UNKNOWN); /* Prefix and table type mismatch */
else
RESULT(T_ENUM_ROA, i, [[ net_roa_check(table, net, as) ]]);
}
INST(FI_ROA_CHECK_EXPLICIT, 2, 1) { /* ROA Check */
NEVER_CONSTANT;
ARG(1, T_NET);
ARG(2, T_INT);
RTC(3);
struct rtable *table = rtc->table;
u32 as = v2.val.i;
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");
if (table->addr_type != (v1.val.net->type == NET_IP4 ? NET_ROA4 : NET_ROA6))
RESULT(T_ENUM_ROA, i, ROA_UNKNOWN); /* Prefix and table type mismatch */
else
RESULT(T_ENUM_ROA, i, [[ net_roa_check(table, v1.val.net, as) ]]);
}
INST(FI_FORMAT, 1, 0) { /* Format */
ARG_ANY(1);
RESULT(T_STRING, s, val_format_str(fpool, &v1));
}
INST(FI_ASSERT, 1, 0) { /* Birdtest Assert */
NEVER_CONSTANT;
ARG(1, T_BOOL);
FID_MEMBER(char *, s, [[strcmp(f1->s, f2->s)]], "string %s", item->s);
ASSERT(s);
if (!bt_assert_hook)
runtime("No bt_assert hook registered, can't assert");
bt_assert_hook(v1.val.i, what);
}
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