Rewrites static attribute filter code and adds ifname/ifindex attributes.
Thanks to Sergey Popovich for the original ifname/ifindex patch.
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4 changed files with 75 additions and 44 deletions
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@ -928,10 +928,16 @@ incompatible with each other (that is to prevent you from shooting in the foot).
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from 0 to 255. Literals of this type are written like IPv4
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addresses.
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<tag/string/ This is a string of characters. There are no ways to modify strings in
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filters. You can pass them between functions, assign them to variables of type <cf/string/, print
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such variables, but you can't concatenate two strings. String literals
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are written as <cf/"This is a string constant"/.
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<tag/string/ This is a string of characters. There are no ways
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to modify strings in filters. You can pass them between
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functions, assign them to variables of type <cf/string/,
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print such variables, use standard string comparison
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operations (e.g. <cf/=, !=, <, >, <=, >=/), but
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you can't concatenate two strings. String literals are
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written as <cf/"This is a string constant"/. Additionaly
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matching <cf/˜/ operator could be used to match a
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string value against a shell pattern (represented also as a
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string).
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<tag/ip/ This type can hold a single IP address. Depending on the compile-time configuration of BIRD you are using, it
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is either an IPv4 or IPv6 address. IP addresses are written in the standard notation (<cf/10.20.30.40/ or <cf/fec0:3:4::1/). You can apply special operator <cf>.mask(<M>num</M>)</cf>
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@ -1194,7 +1200,6 @@ undefined value is regarded as empty clist for most purposes.
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what protocol has told me about this route. Possible values: <cf/RTS_DUMMY/, <cf/RTS_STATIC/, <cf/RTS_INHERIT/, <cf/RTS_DEVICE/, <cf/RTS_STATIC_DEVICE/, <cf/RTS_REDIRECT/, <cf/RTS_RIP/, <cf/RTS_OSPF/, <cf/RTS_OSPF_IA/, <cf/RTS_OSPF_EXT1/, <cf/RTS_OSPF_EXT2/, <cf/RTS_BGP/, <cf/RTS_PIPE/.
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<tag><m/enum/ cast</tag>
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Route type (Currently <cf/RTC_UNICAST/ for normal routes,
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<cf/RTC_BROADCAST/, <cf/RTC_MULTICAST/, <cf/RTC_ANYCAST/ will
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be used in the future for broadcast, multicast and anycast
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@ -1212,6 +1217,19 @@ undefined value is regarded as empty clist for most purposes.
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only to <cf/RTD_BLACKHOLE/, <cf/RTD_UNREACHABLE/ or
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<cf/RTD_PROHIBIT/.
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<tag><m/string/ ifname</tag>
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Name of the outgoing interface. Sink routes (like blackhole,
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unreachable or prohibit) and multipath routes have no interface
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associated with them, so <cf/ifname/ returns an empty string for
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such routes. Read-only.
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<tag><m/int/ ifindex</tag>
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Index of the outgoing interface. System wide index of the
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interface. May be used for interface matching, however
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indexes might change on interface creation/removal. Zero is
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returned for routes with undefined outgoing
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interfaces. Read-only.
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<tag><m/int/ igp_metric</tag>
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The optional attribute that can be used to specify a distance
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to the network for routes that do not have a native protocol
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@ -261,7 +261,8 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
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SET, STRING, BGPMASK, BGPPATH, CLIST, ECLIST,
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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, CAST, DEST, PREFERENCE,
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FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, CAST, DEST, IFNAME, IFINDEX,
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PREFERENCE,
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LEN,
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DEFINED,
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ADD, DELETE, CONTAINS, RESET,
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@ -680,14 +681,16 @@ symbol:
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}
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static_attr:
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FROM { $$ = f_new_inst(); $$->aux = T_IP; $$->a2.i = OFFSETOF(struct rta, from); $$->a1.i = 1; }
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| GW { $$ = f_new_inst(); $$->aux = T_IP; $$->a2.i = OFFSETOF(struct rta, gw); $$->a1.i = 1; }
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| NET { $$ = f_new_inst(); $$->aux = T_PREFIX; $$->a2.i = 0x12345678; /* This is actually ok - T_PREFIX is special-cased. */ }
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| PROTO { $$ = f_new_inst(); $$->aux = T_STRING; $$->a2.i = 0x12345678; /* T_STRING is also special-cased. */ }
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| SOURCE { $$ = f_new_inst(); $$->aux = T_ENUM_RTS; $$->a2.i = OFFSETOF(struct rta, source); }
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| SCOPE { $$ = f_new_inst(); $$->aux = T_ENUM_SCOPE; $$->a2.i = OFFSETOF(struct rta, scope); $$->a1.i = 1; }
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| CAST { $$ = f_new_inst(); $$->aux = T_ENUM_RTC; $$->a2.i = OFFSETOF(struct rta, cast); }
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| DEST { $$ = f_new_inst(); $$->aux = T_ENUM_RTD; $$->a2.i = OFFSETOF(struct rta, dest); $$->a1.i = 1; }
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FROM { $$ = f_new_inst(); $$->aux = T_IP; $$->a2.i = SA_FROM; $$->a1.i = 1; }
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| GW { $$ = f_new_inst(); $$->aux = T_IP; $$->a2.i = SA_GW; $$->a1.i = 1; }
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| NET { $$ = f_new_inst(); $$->aux = T_PREFIX; $$->a2.i = SA_NET; }
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| PROTO { $$ = f_new_inst(); $$->aux = T_STRING; $$->a2.i = SA_PROTO; }
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| SOURCE { $$ = f_new_inst(); $$->aux = T_ENUM_RTS; $$->a2.i = SA_SOURCE; }
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| SCOPE { $$ = f_new_inst(); $$->aux = T_ENUM_SCOPE; $$->a2.i = SA_SCOPE; $$->a1.i = 1; }
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| CAST { $$ = f_new_inst(); $$->aux = T_ENUM_RTC; $$->a2.i = SA_CAST; }
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| DEST { $$ = f_new_inst(); $$->aux = T_ENUM_RTD; $$->a2.i = SA_DEST; $$->a1.i = 1; }
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| IFNAME { $$ = f_new_inst(); $$->aux = T_STRING; $$->a2.i = SA_IFNAME; }
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| IFINDEX { $$ = f_new_inst(); $$->aux = T_INT; $$->a2.i = SA_IFINDEX; }
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;
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term:
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@ -824,24 +824,23 @@ interpret(struct f_inst *what)
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ACCESS_RTE;
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struct rta *rta = (*f_rte)->attrs;
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res.type = what->aux;
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switch(res.type) {
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case T_IP:
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res.val.px.ip = * (ip_addr *) ((char *) rta + what->a2.i);
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break;
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case T_ENUM:
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res.val.i = * ((char *) rta + what->a2.i);
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break;
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case T_STRING: /* Warning: this is a special case for proto attribute */
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res.val.s = rta->proto->name;
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break;
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case T_PREFIX: /* Warning: this works only for prefix of network */
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{
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res.val.px.ip = (*f_rte)->net->n.prefix;
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res.val.px.len = (*f_rte)->net->n.pxlen;
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break;
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}
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switch (what->a2.i)
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{
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case SA_FROM: res.val.px.ip = rta->from; break;
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case SA_GW: res.val.px.ip = rta->gw; break;
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case SA_NET: res.val.px.ip = (*f_rte)->net->n.prefix;
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res.val.px.len = (*f_rte)->net->n.pxlen; break;
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case SA_PROTO: res.val.s = rta->proto->name; break;
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case SA_SOURCE: res.val.i = rta->source; break;
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case SA_SCOPE: res.val.i = rta->scope; break;
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case SA_CAST: res.val.i = rta->cast; break;
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case SA_DEST: res.val.i = rta->dest; break;
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case SA_IFNAME: res.val.s = rta->iface ? rta->iface->name : ""; break;
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case SA_IFINDEX: res.val.i = rta->iface ? rta->iface->index : 0; break;
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default:
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bug( "Invalid type for rta access (%x)", res.type );
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bug("Invalid static attribute access (%x)", res.type);
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}
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}
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break;
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@ -850,19 +849,20 @@ interpret(struct f_inst *what)
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ONEARG;
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if (what->aux != v1.type)
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runtime( "Attempt to set static attribute to incompatible type" );
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f_rta_cow();
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{
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struct rta *rta = (*f_rte)->attrs;
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ip_addr ip;
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switch (what->aux) {
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switch (what->a2.i)
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{
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case SA_FROM:
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rta->from = v1.val.px.ip;
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break;
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case T_IP:
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ip = v1.val.px.ip;
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/* "gw" attribute? */
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if (what->a2.i == OFFSETOF(struct rta, gw))
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case SA_GW:
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{
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ip_addr ip = v1.val.px.ip;
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neighbor *n = neigh_find(rta->proto, &ip, 0);
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if (!n || (n->scope == SCOPE_HOST))
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runtime( "Invalid gw address" );
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rta->nexthops = NULL;
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rta->hostentry = NULL;
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}
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else /* or "from" attribute? */
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rta->from = ip;
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break;
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case T_ENUM_SCOPE:
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case SA_SCOPE:
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rta->scope = v1.val.i;
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break;
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case T_ENUM_RTD:
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case SA_DEST:
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i = v1.val.i;
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if ((i != RTD_BLACKHOLE) && (i != RTD_UNREACHABLE) && (i != RTD_PROHIBIT))
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runtime( "Destination can be changed only to blackhole, unreachable or prohibit" );
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@ -895,7 +892,7 @@ interpret(struct f_inst *what)
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break;
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default:
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bug( "Unknown type in set of static attribute" );
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bug("Invalid static attribute access (%x)", res.type);
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}
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}
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break;
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@ -172,6 +172,19 @@ void val_print(struct f_val v);
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#define T_SET 0x80
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#define T_PREFIX_SET 0x81
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#define SA_FROM 1
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#define SA_GW 2
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#define SA_NET 3
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#define SA_PROTO 4
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#define SA_SOURCE 5
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#define SA_SCOPE 6
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#define SA_CAST 7
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#define SA_DEST 8
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#define SA_IFNAME 9
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#define SA_IFINDEX 10
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struct f_tree {
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struct f_tree *left, *right;
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struct f_val from, to;
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