Commit fc06fb62 authored by Ondřej Zajíček's avatar Ondřej Zajíček

Implements RDNSS and DNSSL support for RAdv.

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