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gnrc/ipv6: notify L3_ROUTING of discovered/ unreachable nodes

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This commit is contained in:
Elena Frank 2025-12-09 14:44:52 +01:00
parent 8746281d9d
commit 352f63de75
4 changed files with 44 additions and 0 deletions
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2
sys/include/net/gnrc/netapi/notify.h
View File

@ -48,6 +48,8 @@ extern "C" {
typedef enum {
NETAPI_NOTIFY_L2_NEIGH_CONNECTED, /**< Connection established on layer 2. */
NETAPI_NOTIFY_L2_NEIGH_DISCONNECTED, /**< Connection closed on layer 2. */
NETAPI_NOTIFY_L3_DISCOVERED, /**< Discovered node on the network layer. */
NETAPI_NOTIFY_L3_UNREACHABLE, /**< Node became unreachable on the network layer. */
} netapi_notify_t;
/**

9
sys/include/net/gnrc/nettype.h
View File

@ -139,6 +139,15 @@ typedef enum {
* and their l2 address.
*/
GNRC_NETTYPE_L2_DISCOVERY,
/**
* @brief Reports routing-relevant information, e.g., discovered or
* unreachable nodes, from the IPv6-layer to routing protocol like
* RPL.
*
* @note Compared to @ref GNRC_NETTYPE_L2_DISCOVERY, events published to
* this type include the IPv6 address of the node.
*/
GNRC_NETTYPE_L3_ROUTING,
/** @} */
/**

16
sys/net/gnrc/netapi/notify/gnrc_netapi_notify.c
View File

@ -36,6 +36,14 @@ int _copy_l2_connection_data(gnrc_netapi_notify_t *notify, netapi_notify_l2_conn
return sizeof(netapi_notify_l2_connection_t);
}
int _copy_l3_address(gnrc_netapi_notify_t *notify, ipv6_addr_t *addr)
{
assert(notify->_data_len == sizeof(ipv6_addr_t));
memcpy(addr, notify->_data, sizeof(ipv6_addr_t));
return sizeof(ipv6_addr_t);
}
int gnrc_netapi_notify_copy_event_data(gnrc_netapi_notify_t *notify, uint8_t data_len, void *data)
{
int res;
@ -49,6 +57,14 @@ int gnrc_netapi_notify_copy_event_data(gnrc_netapi_notify_t *notify, uint8_t dat
}
res = _copy_l2_connection_data(notify, data);
break;
case NETAPI_NOTIFY_L3_DISCOVERED:
case NETAPI_NOTIFY_L3_UNREACHABLE:
if (data_len != sizeof(ipv6_addr_t)) {
res = -EINVAL;
break;
}
res = _copy_l3_address(notify, data);
break;
default:
res = -EINVAL;
break;

17
sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c
View File

@ -207,10 +207,18 @@ static inline void _on_l2_connected(kernel_pid_t if_pid, uint8_t *l2addr, uint8_
{
(void)if_pid;
ipv6_addr_t ipv6;
#if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_6LN)
/* Add neighbor to neighbor cache if interface represents a 6LN. */
gnrc_ipv6_nib_nc_set_6ln(if_pid, l2addr, l2addr_len);
#endif /* CONFIG_GNRC_IPV6_NIB_6LN */
/* Inform routing layer of new reachable neighbor. */
if (_find_entry_in_nc(l2addr, l2addr_len, &ipv6)) {
gnrc_netapi_notify(GNRC_NETTYPE_L3_ROUTING, GNRC_NETREG_DEMUX_CTX_ALL,
NETAPI_NOTIFY_L3_DISCOVERED, &ipv6, sizeof(ipv6_addr_t));
}
}
/**
@ -224,6 +232,15 @@ static inline void _on_l2_disconnected(kernel_pid_t if_pid, uint8_t *l2addr, uin
{
(void)if_pid;
ipv6_addr_t ipv6;
/* Inform routing layer of unreachable neighbor. This must be done *before* removing
the neighbor from the neighbor cache. */
if (_find_entry_in_nc(l2addr, l2addr_len, &ipv6)) {
gnrc_netapi_notify(GNRC_NETTYPE_L3_ROUTING, GNRC_NETREG_DEMUX_CTX_ALL,
NETAPI_NOTIFY_L3_UNREACHABLE, &ipv6, sizeof(ipv6_addr_t));
}
#if IS_ACTIVE(CONFIG_GNRC_IPV6_NIB_ARSM)
/* Remove from neighbor cache. */
gnrc_ipv6_nib_nc_del_l2(if_pid, l2addr, l2addr_len);