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rpl: options validity check

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This commit is contained in:
Cenk Gündoğan 2015-08-19 20:57:28 +02:00
parent ec3274994f
commit eff4653d44
1 changed files with 109 additions and 39 deletions
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148
sys/net/gnrc/routing/rpl/gnrc_rpl_control_messages.c
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@ -36,6 +36,8 @@ static char addr_str[IPV6_ADDR_MAX_STR_LEN];
#define GNRC_RPL_MOP_SHIFT (3)
#define GNRC_RPL_OPT_DODAG_CONF_LEN (14)
#define GNRC_RPL_OPT_PREFIX_INFO_LEN (30)
#define GNRC_RPL_OPT_TARGET_LEN (18)
#define GNRC_RPL_OPT_TRANSIT_INFO_LEN (4)
#define GNRC_RPL_SHIFTED_MOP_MASK (0x7)
#define GNRC_RPL_PRF_MASK (0x7)
#define GNRC_RPL_PREFIX_AUTO_ADDRESS_BIT (1 << 6)
@ -234,6 +236,92 @@ void gnrc_rpl_recv_DIS(gnrc_rpl_dis_t *dis, ipv6_addr_t *src, ipv6_addr_t *dst,
}
}
static bool _gnrc_rpl_check_options_validity(int msg_type, gnrc_rpl_dodag_t *dodag,
gnrc_rpl_opt_t *opt, uint16_t len)
{
uint16_t expected_len = 0;
while(expected_len < len) {
switch(opt->type) {
case (GNRC_RPL_OPT_PAD1):
expected_len += 1;
opt = (gnrc_rpl_opt_t *) (((uint8_t *) opt) + 1);
continue;
case (GNRC_RPL_OPT_DODAG_CONF):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DIO) {
DEBUG("RPL: DODAG CONF DIO option not expected\n");
return false;
}
if (opt->length != GNRC_RPL_OPT_DODAG_CONF_LEN) {
DEBUG("RPL: wrong DIO option (DODAG CONF) len: %d, expected: %d\n",
opt->length, GNRC_RPL_OPT_DODAG_CONF_LEN);
return false;
}
break;
case (GNRC_RPL_OPT_PREFIX_INFO):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DIO) {
DEBUG("RPL: PREFIX INFO DIO option not expected\n");
return false;
}
if (opt->length != GNRC_RPL_OPT_PREFIX_INFO_LEN) {
DEBUG("RPL: wrong DIO option (PREFIX INFO) len: %d, expected: %d\n",
opt->length, GNRC_RPL_OPT_PREFIX_INFO_LEN);
return false;
}
break;
case (GNRC_RPL_OPT_TARGET):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DAO) {
DEBUG("RPL: RPL TARGET DAO option not expected\n");
return false;
}
if (opt->length > GNRC_RPL_OPT_TARGET_LEN) {
DEBUG("RPL: wrong DAO option (RPL TARGET) len: %d, expected (max): %d\n",
opt->length, GNRC_RPL_OPT_TARGET_LEN);
return false;
}
break;
case (GNRC_RPL_OPT_TRANSIT):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DAO) {
DEBUG("RPL: RPL TRANSIT INFO DAO option not expected\n");
return false;
}
uint8_t parent_addr = 0;
if (dodag->instance->mop == GNRC_RPL_MOP_NON_STORING_MODE) {
parent_addr = sizeof(ipv6_addr_t);
}
if (opt->length != (GNRC_RPL_OPT_TRANSIT_INFO_LEN + parent_addr)) {
DEBUG("RPL: wrong DAO option (TRANSIT INFO) len: %d, expected: %d\n",
opt->length, (GNRC_RPL_OPT_TRANSIT_INFO_LEN + parent_addr));
return false;
}
break;
default:
break;
}
expected_len += opt->length + sizeof(gnrc_rpl_opt_t);
opt = (gnrc_rpl_opt_t *) (((uint8_t *) (opt + 1)) + opt->length);
}
if (expected_len == len) {
return true;
}
DEBUG("RPL: wrong options len: %d, expected: %d\n", len, expected_len);
return false;
}
/** @todo allow target prefixes in target options to be of variable length */
bool _parse_options(int msg_type, gnrc_rpl_dodag_t *dodag, gnrc_rpl_opt_t *opt, uint16_t len,
ipv6_addr_t *src)
@ -241,30 +329,25 @@ bool _parse_options(int msg_type, gnrc_rpl_dodag_t *dodag, gnrc_rpl_opt_t *opt,
uint16_t l = 0;
gnrc_rpl_opt_target_t *first_target = NULL;
eui64_t iid;
while(l < len) {
if ((opt->type != GNRC_RPL_OPT_PAD1) && (len < opt->length + sizeof(gnrc_rpl_opt_t) + l)) {
/* return false to delete the dodag,
* because former options may also contain errors */
DEBUG("RPL: Wrong option length encountered\n");
return false;
}
kernel_pid_t if_id = KERNEL_PID_UNDEF;
if (!_gnrc_rpl_check_options_validity(msg_type, dodag, opt, len)) {
return false;
}
while(l < len) {
switch(opt->type) {
case (GNRC_RPL_OPT_PAD1): {
case (GNRC_RPL_OPT_PAD1):
DEBUG("RPL: PAD1 option parsed\n");
l += 1;
opt = (gnrc_rpl_opt_t *) (((uint8_t *) opt) + 1);
continue;
}
case (GNRC_RPL_OPT_PADN): {
case (GNRC_RPL_OPT_PADN):
DEBUG("RPL: PADN option parsed\n");
break;
}
case (GNRC_RPL_OPT_DODAG_CONF): {
if (msg_type != GNRC_RPL_ICMPV6_CODE_DIO) {
DEBUG("RPL: Ignore DODAG CONF DIO option\n");
return true;
}
case (GNRC_RPL_OPT_DODAG_CONF):
DEBUG("RPL: DODAG CONF DIO option parsed\n");
gnrc_rpl_opt_dodag_conf_t *dc = (gnrc_rpl_opt_dodag_conf_t *) opt;
gnrc_rpl_of_t *of = gnrc_rpl_get_of_for_ocp(byteorder_ntohs(dc->ocp));
@ -286,16 +369,12 @@ bool _parse_options(int msg_type, gnrc_rpl_dodag_t *dodag, gnrc_rpl_opt_t *opt,
dodag->trickle.Imax = dodag->dio_interval_doubl;
dodag->trickle.k = dodag->dio_redun;
break;
}
case (GNRC_RPL_OPT_PREFIX_INFO): {
if (msg_type != GNRC_RPL_ICMPV6_CODE_DIO) {
DEBUG("RPL: Ignore Prefix Information DIO option\n");
return true;
}
case (GNRC_RPL_OPT_PREFIX_INFO):
DEBUG("RPL: Prefix Information DIO option parsed\n");
gnrc_rpl_opt_prefix_info_t *pi = (gnrc_rpl_opt_prefix_info_t *) opt;
ipv6_addr_t all_RPL_nodes = GNRC_RPL_ALL_NODES_ADDR;
kernel_pid_t if_id = gnrc_ipv6_netif_find_by_addr(NULL, &all_RPL_nodes);
if_id = gnrc_ipv6_netif_find_by_addr(NULL, &all_RPL_nodes);
/* check for the auto address-configuration flag */
if ((gnrc_netapi_get(if_id, NETOPT_IPV6_IID, 0, &iid, sizeof(eui64_t)) < 0) &&
!(pi->LAR_flags & GNRC_RPL_PREFIX_AUTO_ADDRESS_BIT)) {
@ -305,14 +384,10 @@ bool _parse_options(int msg_type, gnrc_rpl_dodag_t *dodag, gnrc_rpl_opt_t *opt,
gnrc_ipv6_netif_add_addr(if_id, &pi->prefix, pi->prefix_len, 0);
break;
}
case (GNRC_RPL_OPT_TARGET): {
if (msg_type != GNRC_RPL_ICMPV6_CODE_DAO) {
DEBUG("RPL: Ignore RPL TARGET DAO option\n");
return true;
}
case (GNRC_RPL_OPT_TARGET):
DEBUG("RPL: RPL TARGET DAO option parsed\n");
kernel_pid_t if_id = gnrc_ipv6_netif_find_by_prefix(NULL, &dodag->dodag_id);
if_id = gnrc_ipv6_netif_find_by_prefix(NULL, &dodag->dodag_id);
if (if_id == KERNEL_PID_UNDEF) {
DEBUG("RPL: no interface found for the configured DODAG id\n");
return false;
@ -329,12 +404,8 @@ bool _parse_options(int msg_type, gnrc_rpl_dodag_t *dodag, gnrc_rpl_opt_t *opt,
(dodag->default_lifetime * dodag->lifetime_unit) *
SEC_IN_MS);
break;
}
case (GNRC_RPL_OPT_TRANSIT): {
if (msg_type != GNRC_RPL_ICMPV6_CODE_DAO) {
DEBUG("RPL: Ignore RPL TRANSIT INFO DAO option\n");
return true;
}
case (GNRC_RPL_OPT_TRANSIT):
DEBUG("RPL: RPL TRANSIT INFO DAO option parsed\n");
gnrc_rpl_opt_transit_t *transit = (gnrc_rpl_opt_transit_t *) opt;
if (first_target == NULL) {
@ -355,7 +426,7 @@ a preceding RPL TARGET DAO option\n");
first_target = NULL;
break;
}
}
l += opt->length + sizeof(gnrc_rpl_opt_t);
opt = (gnrc_rpl_opt_t *) (((uint8_t *) (opt + 1)) + opt->length);
@ -728,8 +799,7 @@ void gnrc_rpl_recv_DAO(gnrc_rpl_dao_t *dao, ipv6_addr_t *src, uint16_t len)
}
if(!_parse_options(GNRC_RPL_ICMPV6_CODE_DAO, dodag, opts, len, src)) {
DEBUG("RPL: Error encountered during DAO option parsing - remove DODAG\n");
gnrc_rpl_dodag_remove(dodag);
DEBUG("RPL: Error encountered during DAO option parsing - ignore DAO\n");
return;
}