mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-17 16:48:43 +00:00
Implements RDNSS and DNSSL support for RAdv.
This commit is contained in:
Ondrej Zajicek
parent
95127cbbb7
commit
fc06fb6244
@ -2450,6 +2450,20 @@ protocol radv {
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prefix 2001:0DB8:2000::/48 {
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autonomous off; # Do not autoconfigure
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};
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rdnss 2001:0DB8:1234::10; # Short form of RDNSS
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rdnss {
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lifetime mult 10;
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ns 2001:0DB8:1234::11;
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ns 2001:0DB8:1234::12;
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};
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dnssl {
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lifetime 3600;
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domain "abc.com";
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domain "xyz.com";
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};
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}
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</code>
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@ -34,7 +34,8 @@ typedef struct list { /* In fact two overlayed nodes */
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#define HEAD(list) ((void *)((list).head))
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#define TAIL(list) ((void *)((list).tail))
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#define NODE_NEXT(n) ((void *)((NODE (n))->next))
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#define WALK_LIST(n,list) for(n=HEAD(list);(NODE (n))->next; n=NODE_NEXT(n))
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#define NODE_VALID(n) ((NODE (n))->next)
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#define WALK_LIST(n,list) for(n=HEAD(list); NODE_VALID(n); n=NODE_NEXT(n))
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#define WALK_LIST_DELSAFE(n,nxt,list) \
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for(n=HEAD(list); nxt=NODE_NEXT(n); n=(void *) nxt)
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/* WALK_LIST_FIRST supposes that called code removes each processed node */
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@ -14,32 +14,45 @@ CF_DEFINES
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#define RADV_CFG ((struct radv_config *) this_proto)
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#define RADV_IFACE ((struct radv_iface_config *) this_ipatt)
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#define RADV_PREFIX this_radv_prefix
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#define RADV_RDNSS (&this_radv_rdnss)
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#define RADV_DNSSL (&this_radv_dnssl)
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static struct radv_prefix_config *this_radv_prefix;
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static struct radv_rdnss_config this_radv_rdnss;
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static struct radv_dnssl_config this_radv_dnssl;
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static list radv_dns_list; /* Used by radv_rdnss and radv_dnssl */
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static u8 radv_mult_val; /* Used by radv_mult for second return value */
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CF_DECLS
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CF_KEYWORDS(RADV, PREFIX, INTERFACE, MIN, MAX, RA, DELAY, INTERVAL,
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MANAGED, OTHER, CONFIG, LINK, MTU, REACHABLE, TIME, RETRANS,
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TIMER, CURRENT, HOP, LIMIT, DEFAULT, VALID, PREFERRED,
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LIFETIME, SKIP, ONLINK, AUTONOMOUS)
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TIMER, CURRENT, HOP, LIMIT, DEFAULT, VALID, PREFERRED, MULT,
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LIFETIME, SKIP, ONLINK, AUTONOMOUS, RDNSS, DNSSL, NS, DOMAIN,
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LOCAL)
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%type<i> radv_mult
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CF_GRAMMAR
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CF_ADDTO(proto, radv_proto '}')
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CF_ADDTO(proto, radv_proto)
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radv_proto_start: proto_start RADV
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{
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this_proto = proto_config_new(&proto_radv, sizeof(struct radv_config), $1);
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init_list(&RADV_CFG->patt_list);
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init_list(&RADV_CFG->pref_list);
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init_list(&RADV_CFG->rdnss_list);
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init_list(&RADV_CFG->dnssl_list);
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};
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radv_proto_item:
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proto_item
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| PREFIX radv_prefix { add_tail(&RADV_CFG->pref_list, NODE this_radv_prefix); }
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| INTERFACE radv_iface
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| PREFIX radv_prefix { add_tail(&RADV_CFG->pref_list, NODE this_radv_prefix); }
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| RDNSS { init_list(&radv_dns_list); } radv_rdnss { add_tail_list(&RADV_CFG->rdnss_list, &radv_dns_list); }
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| DNSSL { init_list(&radv_dns_list); } radv_dnssl { add_tail_list(&RADV_CFG->dnssl_list, &radv_dns_list); }
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;
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radv_proto_opts:
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@ -48,7 +61,7 @@ radv_proto_opts:
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;
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radv_proto:
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radv_proto_start proto_name '{' radv_proto_opts;
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radv_proto_start proto_name '{' radv_proto_opts '}';
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radv_iface_start:
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@ -57,6 +70,8 @@ radv_iface_start:
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add_tail(&RADV_CFG->patt_list, NODE this_ipatt);
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init_list(&this_ipatt->ipn_list);
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init_list(&RADV_IFACE->pref_list);
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init_list(&RADV_IFACE->rdnss_list);
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init_list(&RADV_IFACE->dnssl_list);
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RADV_IFACE->min_ra_int = -1; /* undefined */
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RADV_IFACE->max_ra_int = DEFAULT_MAX_RA_INT;
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@ -77,6 +92,10 @@ radv_iface_item:
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| CURRENT HOP LIMIT expr { RADV_IFACE->current_hop_limit = $4; if (($4 < 0) || ($4 > 255)) cf_error("Current hop limit must be in range 0-255"); }
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| DEFAULT LIFETIME expr { RADV_IFACE->default_lifetime = $3; if (($3 < 0) || ($3 > 9000)) cf_error("Default lifetime must be in range 0-9000"); }
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| PREFIX radv_prefix { add_tail(&RADV_IFACE->pref_list, NODE this_radv_prefix); }
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| RDNSS { init_list(&radv_dns_list); } radv_rdnss { add_tail_list(&RADV_IFACE->rdnss_list, &radv_dns_list); }
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| DNSSL { init_list(&radv_dns_list); } radv_dnssl { add_tail_list(&RADV_IFACE->dnssl_list, &radv_dns_list); }
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| RDNSS LOCAL bool { RADV_IFACE->rdnss_local = $3; }
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| DNSSL LOCAL bool { RADV_IFACE->dnssl_local = $3; }
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;
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radv_iface_finish:
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@ -152,6 +171,103 @@ radv_prefix:
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radv_prefix_start radv_prefix_opt_list radv_prefix_finish;
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radv_rdnss_node: ipa
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{
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struct radv_rdnss_config *cf = cfg_allocz(sizeof(struct radv_rdnss_config));
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add_tail(&radv_dns_list, NODE cf);
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cf->server = $1;
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cf->lifetime_mult = DEFAULT_DNS_LIFETIME_MULT;
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};
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radv_rdnss_start:
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{
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RADV_RDNSS->lifetime = 0;
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RADV_RDNSS->lifetime_mult = DEFAULT_DNS_LIFETIME_MULT;
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};
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radv_rdnss_item:
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| NS radv_rdnss_node
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| LIFETIME radv_mult { RADV_RDNSS->lifetime = $2; RADV_RDNSS->lifetime_mult = radv_mult_val; }
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;
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radv_rdnss_finish:
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{
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if (EMPTY_LIST(radv_dns_list))
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cf_error("No nameserver in RDNSS section");
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struct radv_rdnss_config *cf;
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WALK_LIST(cf, radv_dns_list)
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{
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cf->lifetime = RADV_RDNSS->lifetime;
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cf->lifetime_mult = RADV_RDNSS->lifetime_mult;
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}
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};
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radv_rdnss_opts:
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/* empty */
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| radv_rdnss_opts radv_rdnss_item ';'
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;
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radv_rdnss:
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radv_rdnss_node
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| '{' radv_rdnss_start radv_rdnss_opts '}' radv_rdnss_finish
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;
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radv_dnssl_node: TEXT
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{
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struct radv_dnssl_config *cf = cfg_allocz(sizeof(struct radv_dnssl_config));
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add_tail(&radv_dns_list, NODE cf);
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cf->domain = $1;
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cf->lifetime_mult = DEFAULT_DNS_LIFETIME_MULT;
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if (radv_process_domain(cf) < 0)
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cf_error("Invalid domain dame");
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};
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radv_dnssl_start:
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{
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RADV_DNSSL->lifetime = 0;
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RADV_DNSSL->lifetime_mult = DEFAULT_DNS_LIFETIME_MULT;
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};
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radv_dnssl_item:
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| DOMAIN radv_dnssl_node
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| LIFETIME radv_mult { RADV_DNSSL->lifetime = $2; RADV_DNSSL->lifetime_mult = radv_mult_val; }
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;
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radv_dnssl_finish:
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{
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if (EMPTY_LIST(radv_dns_list))
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cf_error("No domain in DNSSL section");
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struct radv_dnssl_config *cf;
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WALK_LIST(cf, radv_dns_list)
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{
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cf->lifetime = RADV_DNSSL->lifetime;
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cf->lifetime_mult = RADV_DNSSL->lifetime_mult;
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}
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};
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radv_dnssl_opts:
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/* empty */
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| radv_dnssl_opts radv_dnssl_item ';'
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;
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radv_dnssl:
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radv_dnssl_node
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| '{' radv_dnssl_start radv_dnssl_opts '}' radv_dnssl_finish
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;
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radv_mult:
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expr { $$ = $1; radv_mult_val = 0; }
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| MULT expr { $$ = 0; radv_mult_val = $2; if (($2 < 1) || ($2 > 254)) cf_error("Multiplier must be in range 1-254"); }
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;
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CF_CODE
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CF_END
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@ -24,8 +24,10 @@ struct radv_ra_packet
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#define OPT_RA_MANAGED 0x80
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#define OPT_RA_OTHER_CFG 0x40
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#define OPT_PREFIX 3
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#define OPT_MTU 5
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#define OPT_PREFIX 3
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#define OPT_MTU 5
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#define OPT_RDNSS 25
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#define OPT_DNSSL 31
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struct radv_opt_prefix
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{
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@ -50,6 +52,25 @@ struct radv_opt_mtu
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u32 mtu;
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};
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struct radv_opt_rdnss
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{
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u8 type;
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u8 length;
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u16 reserved;
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u32 lifetime;
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ip_addr servers[];
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};
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struct radv_opt_dnssl
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{
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u8 type;
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u8 length;
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u16 reserved;
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u32 lifetime;
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char domain[];
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};
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static struct radv_prefix_config default_prefix = {
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.onlink = 1,
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.autonomous = 1,
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@ -57,6 +78,7 @@ static struct radv_prefix_config default_prefix = {
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.preferred_lifetime = DEFAULT_PREFERRED_LIFETIME
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};
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static struct radv_prefix_config *
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radv_prefix_match(struct radv_iface *ifa, struct ifa *a)
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{
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@ -78,10 +100,146 @@ radv_prefix_match(struct radv_iface *ifa, struct ifa *a)
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return &default_prefix;
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}
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static int
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radv_prepare_rdnss(struct radv_iface *ifa, list *rdnss_list, char **buf, char *bufend)
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{
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struct radv_rdnss_config *rcf = HEAD(*rdnss_list);
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while(NODE_VALID(rcf))
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{
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struct radv_rdnss_config *rcf_base = rcf;
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struct radv_opt_rdnss *op = (void *) *buf;
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int max_i = (bufend - *buf - sizeof(struct radv_opt_rdnss)) / sizeof(ip_addr);
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int i = 0;
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if (max_i < 1)
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goto too_much;
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op->type = OPT_RDNSS;
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op->reserved = 0;
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if (rcf->lifetime_mult)
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op->lifetime = htonl(rcf->lifetime_mult * ifa->cf->max_ra_int);
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else
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op->lifetime = htonl(rcf->lifetime);
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while(NODE_VALID(rcf) &&
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(rcf->lifetime == rcf_base->lifetime) &&
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(rcf->lifetime_mult == rcf_base->lifetime_mult))
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{
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if (i >= max_i)
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goto too_much;
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op->servers[i] = rcf->server;
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ipa_hton(op->servers[i]);
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i++;
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rcf = NODE_NEXT(rcf);
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}
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op->length = 1+2*i;
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*buf += 8 * op->length;
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}
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return 0;
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too_much:
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log(L_WARN "%s: Too many RA options on interface %s",
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ifa->ra->p.name, ifa->iface->name);
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return -1;
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}
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int
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radv_process_domain(struct radv_dnssl_config *cf)
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{
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/* Format of domain in search list is <size> <label> <size> <label> ... 0 */
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char *dom = cf->domain;
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char *dom_end = dom; /* Just to */
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u8 *dlen_save = &cf->dlen_first;
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int len;
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while (dom_end)
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{
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dom_end = strchr(dom, '.');
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len = dom_end ? (dom_end - dom) : strlen(dom);
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if (len < 1 || len > 63)
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return -1;
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*dlen_save = len;
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dlen_save = (u8 *) dom_end;
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dom += len + 1;
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}
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len = dom - cf->domain;
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if (len > 254)
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return -1;
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cf->dlen_all = len;
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return 0;
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}
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static int
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radv_prepare_dnssl(struct radv_iface *ifa, list *dnssl_list, char **buf, char *bufend)
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{
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struct radv_dnssl_config *dcf = HEAD(*dnssl_list);
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while(NODE_VALID(dcf))
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{
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struct radv_dnssl_config *dcf_base = dcf;
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struct radv_opt_dnssl *op = (void *) *buf;
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int bsize = bufend - *buf - sizeof(struct radv_opt_dnssl);
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int bpos = 0;
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if (bsize < 0)
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goto too_much;
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bsize = bsize & ~7; /* Round down to multiples of 8 */
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op->type = OPT_DNSSL;
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op->reserved = 0;
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if (dcf->lifetime_mult)
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op->lifetime = htonl(dcf->lifetime_mult * ifa->cf->max_ra_int);
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else
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op->lifetime = htonl(dcf->lifetime);
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while(NODE_VALID(dcf) &&
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(dcf->lifetime == dcf_base->lifetime) &&
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(dcf->lifetime_mult == dcf_base->lifetime_mult))
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{
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if (bpos + dcf->dlen_all + 1 > bsize)
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goto too_much;
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op->domain[bpos++] = dcf->dlen_first;
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memcpy(op->domain + bpos, dcf->domain, dcf->dlen_all);
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bpos += dcf->dlen_all;
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dcf = NODE_NEXT(dcf);
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}
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int blen = (bpos + 7) / 8;
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bzero(op->domain + bpos, 8 * blen - bpos);
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op->length = 1 + blen;
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*buf += 8 * op->length;
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}
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return 0;
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too_much:
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log(L_WARN "%s: Too many RA options on interface %s",
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ifa->ra->p.name, ifa->iface->name);
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return -1;
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}
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static void
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radv_prepare_ra(struct radv_iface *ifa)
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{
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struct proto_radv *ra = ifa->ra;
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struct radv_config *cf = (struct radv_config *) (ra->p.cf);
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char *buf = ifa->sk->tbuf;
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char *bufstart = buf;
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@ -121,7 +279,7 @@ radv_prepare_ra(struct radv_iface *ifa)
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if (buf + sizeof(struct radv_opt_prefix) > bufend)
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{
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log(L_WARN "%s: Too many prefixes on interface %s", ra->p.name, ifa->iface->name);
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break;
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goto done;
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}
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struct radv_opt_prefix *op = (void *) buf;
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@ -137,7 +295,22 @@ radv_prepare_ra(struct radv_iface *ifa)
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ipa_hton(op->prefix);
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buf += sizeof(*op);
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}
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if (! ifa->cf->rdnss_local)
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if (radv_prepare_rdnss(ifa, &cf->rdnss_list, &buf, bufend) < 0)
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goto done;
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if (radv_prepare_rdnss(ifa, &ifa->cf->rdnss_list, &buf, bufend) < 0)
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goto done;
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if (! ifa->cf->dnssl_local)
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if (radv_prepare_dnssl(ifa, &cf->dnssl_list, &buf, bufend) < 0)
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goto done;
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if (radv_prepare_dnssl(ifa, &ifa->cf->dnssl_list, &buf, bufend) < 0)
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goto done;
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done:
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ifa->plen = buf - bufstart;
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}
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@ -29,6 +29,10 @@
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* radv_iface_notify(), which processes asynchronous events (specified
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* by RA_EV_* codes), and radv_timer(), which triggers sending RAs and
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* computes the next timeout.
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*
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* Supported standards:
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* - RFC 4861 - main RA standard
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* - RFC 6106 - DNS extensions (RDDNS, DNSSL)
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*/
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||||
|
||||
static void
|
||||
|
||||
@ -42,24 +42,33 @@
|
||||
#define DEFAULT_VALID_LIFETIME 86400
|
||||
#define DEFAULT_PREFERRED_LIFETIME 14400
|
||||
|
||||
#define DEFAULT_DNS_LIFETIME_MULT 3
|
||||
|
||||
|
||||
struct radv_config
|
||||
{
|
||||
struct proto_config c;
|
||||
list patt_list; /* List of iface configs (struct radv_iface_config) */
|
||||
list pref_list; /* Global list of prefix configs (struct radv_prefix_config) */
|
||||
list rdnss_list; /* Global list of RDNSS configs (struct radv_rdnss_config) */
|
||||
list dnssl_list; /* Global list of DNSSL configs (struct radv_dnssl_config) */
|
||||
};
|
||||
|
||||
struct radv_iface_config
|
||||
{
|
||||
struct iface_patt i;
|
||||
list pref_list; /* Local list of prefix configs (struct radv_prefix_config) */
|
||||
list rdnss_list; /* Local list of RDNSS configs (struct radv_rdnss_config) */
|
||||
list dnssl_list; /* Local list of DNSSL configs (struct radv_dnssl_config) */
|
||||
|
||||
u32 min_ra_int; /* Standard options from RFC 4261 */
|
||||
u32 max_ra_int;
|
||||
u32 min_delay;
|
||||
|
||||
u8 managed;
|
||||
u8 rdnss_local; /* Global list is not used for RDNSS */
|
||||
u8 dnssl_local; /* Global list is not used for DNSSL */
|
||||
|
||||
u8 managed; /* Standard options from RFC 4261 */
|
||||
u8 other_config;
|
||||
u32 link_mtu;
|
||||
u32 reachable_time;
|
||||
@ -81,6 +90,25 @@ struct radv_prefix_config
|
||||
u32 preferred_lifetime;
|
||||
};
|
||||
|
||||
struct radv_rdnss_config
|
||||
{
|
||||
node n;
|
||||
u32 lifetime; /* Valid if lifetime_mult is 0 */
|
||||
u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
|
||||
ip_addr server; /* IP address of recursive DNS server */
|
||||
};
|
||||
|
||||
struct radv_dnssl_config
|
||||
{
|
||||
node n;
|
||||
u32 lifetime; /* Valid if lifetime_mult is 0 */
|
||||
u16 lifetime_mult; /* Lifetime specified as multiple of max_ra_int */
|
||||
u8 dlen_first; /* Length of first label in domain */
|
||||
u8 dlen_all; /* Both dlen_ filled in radv_process_domain() */
|
||||
char *domain; /* Domain for DNS search list, in processed form */
|
||||
};
|
||||
|
||||
|
||||
struct proto_radv
|
||||
{
|
||||
struct proto p;
|
||||
@ -123,6 +151,7 @@ struct radv_iface
|
||||
void radv_iface_notify(struct radv_iface *ifa, int event);
|
||||
|
||||
/* packets.c */
|
||||
int radv_process_domain(struct radv_dnssl_config *cf);
|
||||
void radv_send_ra(struct radv_iface *ifa, int shutdown);
|
||||
int radv_sk_open(struct radv_iface *ifa);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user