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gnrc_uhcp: use actually advertised prefix length

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This makes the UHCP client to use the actually advertised prefix length
instead of assuming /64.
This commit is contained in:
Martine S. Lenders 2020-03-25 14:33:10 +01:00
parent 1c7903287a
commit 01d94f268a
No known key found for this signature in database
GPG Key ID: CCD317364F63286F
1 changed files with 14 additions and 9 deletions
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23
sys/net/gnrc/application_layer/uhcpc/gnrc_uhcpc.c
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@ -57,6 +57,7 @@ static void set_interface_roles(void)
}
static ipv6_addr_t _prefix;
static uint8_t _prefix_len;
#ifdef MODULE_GNRC_SIXLOWPAN_CTX
#define SIXLO_CTX_LTIME_MIN (60U) /**< context lifetime in minutes */
@ -102,7 +103,6 @@ static void _update_6ctx(const ipv6_addr_t *prefix, uint8_t prefix_len)
void uhcp_handle_prefix(uint8_t *prefix, uint8_t prefix_len, uint16_t lifetime, uint8_t *src, uhcp_iface_t iface)
{
(void)prefix_len;
(void)lifetime;
(void)src;
@ -126,13 +126,15 @@ void uhcp_handle_prefix(uint8_t *prefix, uint8_t prefix_len, uint16_t lifetime,
return;
}
if (ipv6_addr_equal(&_prefix, (ipv6_addr_t*)prefix)) {
if ((_prefix_len == prefix_len) &&
(ipv6_addr_match_prefix(&_prefix,
(ipv6_addr_t *)prefix) >= prefix_len)) {
LOG_WARNING("gnrc_uhcpc: uhcp_handle_prefix(): got same prefix again\n");
#ifdef MODULE_GNRC_SIXLOWPAN_CTX
if (gnrc_netif_is_6ln(gnrc_netif_get_by_pid(gnrc_wireless_interface))) {
/* always update 6LoWPAN compression context so it does not time
* out, we can't just remove it anyway according to the RFC */
_update_6ctx((ipv6_addr_t *)prefix, 64);
_update_6ctx((ipv6_addr_t *)prefix, prefix_len);
}
#endif
return;
@ -144,11 +146,13 @@ void uhcp_handle_prefix(uint8_t *prefix, uint8_t prefix_len, uint16_t lifetime,
GNRC_IPV6_NIB_CONF_MULTIHOP_P6C
gnrc_ipv6_nib_abr_del(&_prefix);
#endif
LOG_INFO("gnrc_uhcpc: uhcp_handle_prefix(): removed old prefix %s/64\n",
ipv6_addr_to_str(addr_str, &_prefix, sizeof(addr_str)));
LOG_INFO("gnrc_uhcpc: uhcp_handle_prefix(): removed old prefix %s/%u\n",
ipv6_addr_to_str(addr_str, &_prefix, sizeof(addr_str)),
prefix_len);
}
memcpy(&_prefix, prefix, sizeof(_prefix));
gnrc_netapi_set(gnrc_wireless_interface, NETOPT_IPV6_ADDR, (64 << 8),
_prefix_len = prefix_len;
gnrc_netapi_set(gnrc_wireless_interface, NETOPT_IPV6_ADDR, (prefix_len << 8),
prefix, sizeof(ipv6_addr_t));
/* only configure 6Lo-ND features when wireless interface uses
* 6Lo-ND */
@ -156,7 +160,7 @@ void uhcp_handle_prefix(uint8_t *prefix, uint8_t prefix_len, uint16_t lifetime,
#ifdef MODULE_GNRC_SIXLOWPAN_CTX
/* add compression before ABR to add it automatically to its context
* list */
_update_6ctx((ipv6_addr_t *)prefix, 64);
_update_6ctx((ipv6_addr_t *)prefix, prefix_len);
#endif
#if defined(MODULE_GNRC_IPV6_NIB) && GNRC_IPV6_NIB_CONF_6LBR && \
GNRC_IPV6_NIB_CONF_MULTIHOP_P6C
@ -171,8 +175,9 @@ void uhcp_handle_prefix(uint8_t *prefix, uint8_t prefix_len, uint16_t lifetime,
}
gnrc_rpl_root_init(GNRC_RPL_DEFAULT_INSTANCE, (ipv6_addr_t*)prefix, false, false);
#endif
LOG_INFO("gnrc_uhcpc: uhcp_handle_prefix(): configured new prefix %s/64\n",
ipv6_addr_to_str(addr_str, (ipv6_addr_t *)prefix, sizeof(addr_str)));
LOG_INFO("gnrc_uhcpc: uhcp_handle_prefix(): configured new prefix %s/%u\n",
ipv6_addr_to_str(addr_str, (ipv6_addr_t *)prefix, sizeof(addr_str)),
prefix_len);
}
extern void uhcp_client(uhcp_iface_t iface);