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Cope with DHCPv6 REQUESTs without address options.

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This commit is contained in:
Simon Kelley
2013-09-13 11:22:55 +01:00
parent ceae52df15
commit c8f2dd8b53
2 changed files with 38 additions and 22 deletions
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3
CHANGELOG
View File

@@ -111,6 +111,9 @@ version 2.67
revealing size changes during development. Thanks to
Vladislav Grishenko for the patch.
Cope with DHCPv6 clients which send REQUESTs without
address options - treat them as SOLICIT with rapid commit.
version 2.66
Add the ability to act as an authoritative DNS

57
src/rfc3315.c
View File

@@ -21,7 +21,7 @@
struct state {
unsigned char *clid;
int clid_len, iaid, ia_type, interface, hostname_auth;
int clid_len, iaid, ia_type, interface, hostname_auth, lease_allocate;
char *client_hostname, *hostname, *domain, *send_domain;
struct dhcp_context *context;
struct in6_addr *link_address;
@@ -55,7 +55,7 @@ static void mark_context_used(struct state *state, struct dhcp_context *context,
static void mark_config_used(struct dhcp_context *context, struct in6_addr *addr);
static int check_address(struct state *state, struct in6_addr *addr);
static void add_address(struct state *state, struct dhcp_context *context, unsigned int lease_time, void *ia_option,
unsigned int *min_time, struct in6_addr *addr, int update_lease, time_t now);
unsigned int *min_time, struct in6_addr *addr, time_t now);
static void update_leases(struct state *state, struct dhcp_context *context, struct in6_addr *addr, unsigned int lease_time, time_t now);
static int add_local_addrs(struct dhcp_context *context);
static struct dhcp_netid *add_options(struct state *state, struct in6_addr *fallback, struct dhcp_context *context, int do_refresh);
@@ -226,6 +226,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
state.end = inbuff + sz;
state.clid = NULL;
state.clid_len = 0;
state.lease_allocate = 0;
state.context_tags = NULL;
state.tags = tags;
state.link_address = link_address;
@@ -536,27 +537,29 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
{
default:
return 0;
case DHCP6SOLICIT:
{
void *rapid_commit = opt6_find(state.packet_options, state.end, OPTION6_RAPID_COMMIT, 0);
int address_assigned = 0;
/* tags without all prefix-class tags */
struct dhcp_netid *solicit_tags = tagif;
struct dhcp_context *c;
if (rapid_commit)
*outmsgtypep = DHCP6ADVERTISE;
if (opt6_find(state.packet_options, state.end, OPTION6_RAPID_COMMIT, 0))
{
*outmsgtypep = DHCP6REPLY;
state.lease_allocate = 1;
o = new_opt6(OPTION6_RAPID_COMMIT);
end_opt6(o);
}
/* set reply message type */
*outmsgtypep = rapid_commit ? DHCP6REPLY : DHCP6ADVERTISE;
log6_packet(&state, "DHCPSOLICIT", NULL, ignore ? _("ignored") : NULL);
log6_packet(&state, "DHCPSOLICIT", NULL, ignore ? _("ignored") : NULL);
request_no_address:
if (ignore)
return 0;
@@ -671,7 +674,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
if (dump_all_prefix_classes && state.ia_type == OPTION6_IA_NA)
state.send_prefix_class = prefix_class_from_context(c);
#endif
add_address(&state, c, lease_time, ia_option, &min_time, req_addr, rapid_commit != NULL, now);
add_address(&state, c, lease_time, ia_option, &min_time, req_addr, now);
mark_context_used(&state, context, req_addr);
get_context_tag(&state, c);
address_assigned = 1;
@@ -695,7 +698,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
if (dump_all_prefix_classes && state.ia_type == OPTION6_IA_NA)
state.send_prefix_class = prefix_class_from_context(c);
#endif
add_address(&state, c, lease_time, NULL, &min_time, &addr, rapid_commit != NULL, now);
add_address(&state, c, lease_time, NULL, &min_time, &addr, now);
mark_context_used(&state, context, &addr);
get_context_tag(&state, c);
address_assigned = 1;
@@ -712,7 +715,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
if (dump_all_prefix_classes && state.ia_type == OPTION6_IA_NA)
state.send_prefix_class = prefix_class_from_context(c);
#endif
add_address(&state, c, c->lease_time, NULL, &min_time, req_addr, rapid_commit != NULL, now);
add_address(&state, c, c->lease_time, NULL, &min_time, req_addr, now);
mark_context_used(&state, context, req_addr);
get_context_tag(&state, c);
address_assigned = 1;
@@ -726,7 +729,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
if (dump_all_prefix_classes && state.ia_type == OPTION6_IA_NA)
state.send_prefix_class = prefix_class_from_context(c);
#endif
add_address(&state, c, c->lease_time, NULL, &min_time, &addr, rapid_commit != NULL, now);
add_address(&state, c, c->lease_time, NULL, &min_time, &addr, now);
mark_context_used(&state, context, &addr);
get_context_tag(&state, c);
address_assigned = 1;
@@ -766,9 +769,11 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
case DHCP6REQUEST:
{
int address_assigned = 0;
int start = save_counter(-1);
/* set reply message type */
*outmsgtypep = DHCP6REPLY;
state.lease_allocate = 1;
log6_packet(&state, "DHCPREQUEST", NULL, ignore ? _("ignored") : NULL);
@@ -783,7 +788,15 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
if (!check_ia(&state, opt, &ia_end, &ia_option))
continue;
if (!ia_option)
{
/* If we get a request with a IA_*A without addresses, treat it exactly like
a SOLICT with rapid commit set. */
save_counter(start);
goto request_no_address;
}
o = build_ia(&state, &t1cntr);
for (; ia_option; ia_option = opt6_find(opt6_next(ia_option, ia_end), ia_end, OPTION6_IAADDR, 24))
@@ -829,7 +842,7 @@ static int dhcp6_no_relay(int msg_type, struct in6_addr *link_address, struct dh
if (dump_all_prefix_classes && state.ia_type == OPTION6_IA_NA)
state.send_prefix_class = prefix_class_from_context(c);
#endif
add_address(&state, dynamic, lease_time, ia_option, &min_time, req_addr, 1, now);
add_address(&state, dynamic, lease_time, ia_option, &min_time, req_addr, now);
get_context_tag(&state, dynamic);
address_assigned = 1;
}
@@ -1505,7 +1518,7 @@ static void end_ia(int t1cntr, unsigned int min_time, int do_fuzz)
}
static void add_address(struct state *state, struct dhcp_context *context, unsigned int lease_time, void *ia_option,
unsigned int *min_time, struct in6_addr *addr, int do_update, time_t now)
unsigned int *min_time, struct in6_addr *addr, time_t now)
{
unsigned int valid_time = 0, preferred_time = 0;
int o = new_opt6(OPTION6_IAADDR);
@@ -1535,7 +1548,7 @@ static void add_address(struct state *state, struct dhcp_context *context, unsig
end_opt6(o);
if (do_update)
if (state->lease_allocate)
update_leases(state, context, addr, valid_time, now);
if ((lease = lease6_find_by_addr(addr, 128, 0)))
@@ -1559,7 +1572,7 @@ static void add_address(struct state *state, struct dhcp_context *context, unsig
}
}
log6_packet(state, do_update ? "DHCPREPLY" : "DHCPADVERTISE", addr, state->hostname);
log6_packet(state, state->lease_allocate ? "DHCPREPLY" : "DHCPADVERTISE", addr, state->hostname);
}