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Filters: Also sender protocol and channel name available
Introducing the object member dereference framework.
This commit is contained in:
Maria Matejka
parent
064b59d1c7
commit
598cebd19f
@ -1,4 +1,4 @@
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src := filter.c data.c f-util.c tree.c trie.c inst-gen.c
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src := filter.c data.c deref.c f-util.c tree.c trie.c inst-gen.c
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obj := $(src-o-files)
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$(all-daemon)
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$(cf-local)
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@ -431,7 +431,7 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
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SET, STRING, BGPMASK, BGPPATH, CLIST, ECLIST, LCLIST,
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IF, THEN, ELSE, CASE,
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TRUE, FALSE, RT, RO, UNKNOWN, GENERIC,
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FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, DEST, IFNAME, IFINDEX,
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FROM, GW, NET, MASK, PROTO, AUTHOR, SENDER, SOURCE, SCOPE, DEST, IFNAME, IFINDEX,
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PREFERENCE,
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ROA_CHECK, ASN, SRC, DST,
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IS_V4, IS_V6,
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@ -902,6 +902,8 @@ static_attr:
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| GW { $$ = f_new_static_attr(T_IP, SA_GW, 0); }
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| NET { $$ = f_new_static_attr(T_NET, SA_NET, 1); }
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| PROTO { $$ = f_new_static_attr(T_STRING, SA_PROTO, 1); }
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| SENDER { $$ = f_new_static_attr(T_CHANNEL, SA_SENDER, 1); }
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| AUTHOR { $$ = f_new_static_attr(T_PROTO, SA_AUTHOR, 1); }
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| SOURCE { $$ = f_new_static_attr(T_ENUM_RTS, SA_SOURCE, 1); }
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| SCOPE { $$ = f_new_static_attr(T_ENUM_SCOPE, SA_SCOPE, 0); }
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| DEST { $$ = f_new_static_attr(T_ENUM_RTD, SA_DEST, 0); }
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@ -938,19 +940,24 @@ term:
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| dynamic_attr { $$ = f_new_inst(FI_EA_GET, $1); }
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| term '.' IS_V4 { $$ = f_new_inst(FI_IS_V4, $1); }
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| term '.' TYPE { $$ = f_new_inst(FI_TYPE, $1); }
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| term '.' IP { $$ = f_new_inst(FI_IP, $1); }
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| term '.' RD { $$ = f_new_inst(FI_ROUTE_DISTINGUISHER, $1); }
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| term '.' LEN { $$ = f_new_inst(FI_LENGTH, $1); }
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| term '.' MAXLEN { $$ = f_new_inst(FI_ROA_MAXLEN, $1); }
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| term '.' ASN { $$ = f_new_inst(FI_ROA_ASN, $1); }
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| term '.' SRC { $$ = f_new_inst(FI_NET_SRC, $1); }
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| term '.' DST { $$ = f_new_inst(FI_NET_DST, $1); }
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| term '.' MASK '(' term ')' { $$ = f_new_inst(FI_IP_MASK, $1, $5); }
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| term '.' FIRST { $$ = f_new_inst(FI_AS_PATH_FIRST, $1); }
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| term '.' LAST { $$ = f_new_inst(FI_AS_PATH_LAST, $1); }
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| term '.' LAST_NONAGGREGATED { $$ = f_new_inst(FI_AS_PATH_LAST_NAG, $1); }
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| term '.' token {
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switch ($3.value) {
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case IS_V4: $$ = f_new_inst(FI_IS_V4, $1); break;
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case TYPE: $$ = f_new_inst(FI_TYPE, $1); break;
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case IP: $$ = f_new_inst(FI_IP, $1); break;
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case RD: $$ = f_new_inst(FI_ROUTE_DISTINGUISHER, $1); break;
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case LEN: $$ = f_new_inst(FI_LENGTH, $1); break;
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case MAXLEN: $$ = f_new_inst(FI_ROA_MAXLEN, $1); break;
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case ASN: $$ = f_new_inst(FI_ROA_ASN, $1); break;
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case SRC: $$ = f_new_inst(FI_NET_SRC, $1); break;
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case DST: $$ = f_new_inst(FI_NET_DST, $1); break;
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case FIRST: $$ = f_new_inst(FI_AS_PATH_FIRST, $1); break;
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case LAST: $$ = f_new_inst(FI_AS_PATH_LAST, $1); break;
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case LAST_NONAGGREGATED: $$ = f_new_inst(FI_AS_PATH_LAST_NAG, $1); break;
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default: $$ = f_new_inst(FI_DEREF, $1, f_get_deref($1->type, &$3)); break;
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}
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}
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/* Communities */
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/* This causes one shift/reduce conflict
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@ -61,6 +61,9 @@ enum f_type {
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T_SET = 0x80,
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T_PREFIX_SET = 0x81,
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T_PROTO = 0xa0, /* Protocol instance */
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T_CHANNEL = 0xa1, /* Channel */
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} PACKED;
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/* Filter value; size of this affects filter memory consumption */
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@ -78,6 +81,8 @@ struct f_val {
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const struct adata *ad;
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const struct f_path_mask *path_mask;
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struct f_path_mask_item pmi;
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struct proto *proto;
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struct channel *channel;
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} val;
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};
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@ -94,6 +99,8 @@ enum f_sa_code {
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SA_GW,
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SA_NET,
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SA_PROTO,
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SA_SENDER,
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SA_AUTHOR,
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SA_SOURCE,
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SA_SCOPE,
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SA_DEST,
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@ -126,6 +133,16 @@ struct f_lval {
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};
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};
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/* Member dereference (in filter/deref.c) */
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struct f_deref {
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struct f_val (*deref)(struct f_val *);
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const char *name;
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enum f_type source_type, result_type;
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};
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struct keyword;
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const struct f_deref *f_get_deref(enum f_type, const struct keyword *);
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/* IP prefix range structure */
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struct f_prefix {
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net_addr net; /* The matching prefix must match this net */
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@ -90,7 +90,7 @@ FID_DUMP_BODY()m4_dnl
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debug("%s" $4 "\n", INDENT, $5);
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]])
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FID_INTERPRET_EXEC()m4_dnl
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const $1 $2 = whati->$2
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$1 const $2 = whati->$2
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FID_INTERPRET_BODY')
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# Instruction arguments are needed only until linearization is done.
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68
filter/deref.c
Normal file
68
filter/deref.c
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@ -0,0 +1,68 @@
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/*
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* Filters: dereferencing metaobjects
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*
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* (c) 2020 Maria Matejka <mq@jmq.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*
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*/
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#define PARSER 1
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#include "nest/bird.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "filter/filter.h"
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#include "filter/f-inst.h"
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#include "filter/data.h"
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#include "conf/conf.h"
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#include "conf/cf-parse.tab.h"
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static struct f_val deref_proto__name__deref(struct f_val *val)
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{ return (struct f_val) { .type = T_STRING, .val.s = val->val.proto->name }; }
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static const struct f_deref deref_proto__name = {
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.deref = deref_proto__name__deref,
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.name = "name",
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.source_type = T_PROTO,
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.result_type = T_STRING,
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};
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static struct f_val deref_channel__name__deref(struct f_val *val)
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{ return (struct f_val) { .type = T_STRING, .val.s = val->val.channel->name }; }
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static const struct f_deref deref_channel__name = {
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.deref = deref_channel__name__deref,
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.name = "name",
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.source_type = T_CHANNEL,
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.result_type = T_STRING,
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};
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static struct f_val deref_channel__proto__deref(struct f_val *val)
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{ return (struct f_val) { .type = T_PROTO, .val.proto = val->val.channel->proto }; }
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static const struct f_deref deref_channel__proto = {
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.deref = deref_channel__proto__deref,
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.name = "proto",
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.source_type = T_CHANNEL,
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.result_type = T_PROTO,
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};
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const struct f_deref *f_get_deref(enum f_type type, const struct keyword *kw)
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{
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if (!type)
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cf_error("Can't dereference an object with unsure type");
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#define CX(t, v) ((u64) (t) | ((v) << (8 * sizeof (enum f_type))))
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switch (CX(type, kw->value))
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{
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case CX(T_PROTO, NAME):
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return &deref_proto__name;
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case CX(T_CHANNEL, NAME):
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return &deref_channel__name;
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case CX(T_CHANNEL, PROTO):
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return &deref_channel__proto;
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}
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cf_error("Can't call (%s).%s: Undefined operation", f_type_name(type), kw->name);
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}
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@ -404,6 +404,21 @@
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RESULT(T_BOOL, i, (v1.type != T_VOID) && !undef_value(v1));
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}
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INST(FI_DEREF, 1, 1) {
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NEVER_CONSTANT;
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ARG_ANY(1);
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FID_MEMBER(
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const struct f_deref *,
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deref,
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[[ f1->deref != f2->deref ]],
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"dereference %s from %s",
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[[ item->deref->name, f_type_name(item->deref->source_type) ]]
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);
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RESULT_TYPE(deref->result_type);
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RESULT_VAL(deref->deref(&v1));
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}
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INST(FI_TYPE, 1, 1) {
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ARG_ANY(1); /* There may be more types supporting this operation */
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switch (v1.type)
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@ -503,6 +518,8 @@
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case SA_GW: RESULT(sa.f_type, ip, rta->nh.gw); break;
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case SA_NET: RESULT(sa.f_type, net, (*fs->rte)->net->n.addr); break;
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case SA_PROTO: RESULT(sa.f_type, s, rta->src->proto->name); break;
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case SA_SENDER: RESULT(sa.f_type, channel, (*fs->rte)->sender); break;
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case SA_AUTHOR: RESULT(sa.f_type, proto, rta->src->proto); break;
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case SA_SOURCE: RESULT(sa.f_type, i, rta->source); break;
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case SA_SCOPE: RESULT(sa.f_type, i, rta->scope); break;
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case SA_DEST: RESULT(sa.f_type, i, rta->dest); break;
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