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SNMP MIB2: Implement tcpListenerTable

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This commit is contained in:
Dirk Ziegelmeier 2016-01-02 20:06:53 +01:00
parent 19dd6c391f
commit e1e7a704e1
1 changed files with 144 additions and 8 deletions
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152
src/apps/snmp/snmp_mib2.c
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@ -212,10 +212,8 @@ static const struct snmp_tree_node udp_root = SNMP_CREATE_TREE_NODE(7, udp_nodes
/* --- tcp .1.3.6.1.2.1.6 ----------------------------------------------------- */
/* implement this group only, if the TCP protocol is available */
#if LWIP_TCP && LWIP_IPV4
#if LWIP_TCP
static u16_t tcp_get_value(struct snmp_node_instance* instance, void* value);
static snmp_err_t tcp_ConnTable_get_cell_value(const u32_t* column, const u32_t* row_oid, u8_t row_oid_len, union snmp_variant_value* value, u32_t* value_len);
static snmp_err_t tcp_ConnTable_get_next_cell_instance_and_value(const u32_t* column, struct snmp_obj_id* row_oid, union snmp_variant_value* value, u32_t* value_len);
static const struct snmp_scalar_node tcp_RtoAlgorithm = SNMP_SCALAR_CREATE_NODE_READONLY(1, SNMP_ASN1_TYPE_INTEGER, tcp_get_value);
static const struct snmp_scalar_node tcp_RtoMin = SNMP_SCALAR_CREATE_NODE_READONLY(2, SNMP_ASN1_TYPE_INTEGER, tcp_get_value);
@ -231,6 +229,12 @@ static const struct snmp_scalar_node tcp_OutSegs = SNMP_SCALAR_CREATE_NODE
static const struct snmp_scalar_node tcp_RetransSegs = SNMP_SCALAR_CREATE_NODE_READONLY(12, SNMP_ASN1_TYPE_COUNTER, tcp_get_value);
static const struct snmp_scalar_node tcp_InErrs = SNMP_SCALAR_CREATE_NODE_READONLY(14, SNMP_ASN1_TYPE_COUNTER, tcp_get_value);
static const struct snmp_scalar_node tcp_OutRsts = SNMP_SCALAR_CREATE_NODE_READONLY(15, SNMP_ASN1_TYPE_COUNTER, tcp_get_value);
static const struct snmp_scalar_node tcp_HCInSegs = SNMP_SCALAR_CREATE_NODE_READONLY(17, SNMP_ASN1_TYPE_COUNTER64, tcp_get_value);
static const struct snmp_scalar_node tcp_HCOutSegs = SNMP_SCALAR_CREATE_NODE_READONLY(18, SNMP_ASN1_TYPE_COUNTER64, tcp_get_value);
#if LWIP_IPV4
static snmp_err_t tcp_ConnTable_get_cell_value(const u32_t* column, const u32_t* row_oid, u8_t row_oid_len, union snmp_variant_value* value, u32_t* value_len);
static snmp_err_t tcp_ConnTable_get_next_cell_instance_and_value(const u32_t* column, struct snmp_obj_id* row_oid, union snmp_variant_value* value, u32_t* value_len);
static const struct snmp_table_simple_col_def tcp_ConnTable_columns[] = {
{ 1, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 }, /* tcpConnState */
@ -241,6 +245,17 @@ static const struct snmp_table_simple_col_def tcp_ConnTable_columns[] = {
};
static const struct snmp_table_simple_node tcp_ConnTable = SNMP_TABLE_CREATE_SIMPLE(13, tcp_ConnTable_columns, tcp_ConnTable_get_cell_value, tcp_ConnTable_get_next_cell_instance_and_value);
#endif /* LWIP_IPV4 */
static snmp_err_t tcp_ListenerTable_get_cell_value(const u32_t* column, const u32_t* row_oid, u8_t row_oid_len, union snmp_variant_value* value, u32_t* value_len);
static snmp_err_t tcp_ListenerTable_get_next_cell_instance_and_value(const u32_t* column, struct snmp_obj_id* row_oid, union snmp_variant_value* value, u32_t* value_len);
static const struct snmp_table_simple_col_def tcp_ListenerTable_columns[] = {
/* all items except tcpListenerProcess are declared as not-accessible */
{ 4, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 } /* tcpListenerProcess */
};
static const struct snmp_table_simple_node tcp_ListenerTable = SNMP_TABLE_CREATE_SIMPLE(20, tcp_ListenerTable_columns, tcp_ListenerTable_get_cell_value, tcp_ListenerTable_get_next_cell_instance_and_value);
/* the following nodes access variables in LWIP stack from SNMP worker thread and must therefore be synced to LWIP (TCPIP) thread */
CREATE_LWIP_SYNC_NODE( 1, tcp_RtoAlgorithm)
@ -255,9 +270,14 @@ CREATE_LWIP_SYNC_NODE( 9, tcp_CurrEstab)
CREATE_LWIP_SYNC_NODE(10, tcp_InSegs)
CREATE_LWIP_SYNC_NODE(11, tcp_OutSegs)
CREATE_LWIP_SYNC_NODE(12, tcp_RetransSegs)
#if LWIP_IPV4
CREATE_LWIP_SYNC_NODE(13, tcp_ConnTable)
#endif /* LWIP_IPV4 */
CREATE_LWIP_SYNC_NODE(14, tcp_InErrs)
CREATE_LWIP_SYNC_NODE(15, tcp_OutRsts)
CREATE_LWIP_SYNC_NODE(17, tcp_HCInSegs)
CREATE_LWIP_SYNC_NODE(18, tcp_HCOutSegs)
CREATE_LWIP_SYNC_NODE(20, tcp_ListenerTable)
static const struct snmp_node* tcp_nodes[] = {
&SYNC_NODE_NAME(tcp_RtoAlgorithm).node.node,
@ -272,13 +292,18 @@ static const struct snmp_node* tcp_nodes[] = {
&SYNC_NODE_NAME(tcp_InSegs).node.node,
&SYNC_NODE_NAME(tcp_OutSegs).node.node,
&SYNC_NODE_NAME(tcp_RetransSegs).node.node,
#if LWIP_IPV4
&SYNC_NODE_NAME(tcp_ConnTable).node.node,
#endif /* LWIP_IPV4 */
&SYNC_NODE_NAME(tcp_InErrs).node.node,
&SYNC_NODE_NAME(tcp_OutRsts).node.node
&SYNC_NODE_NAME(tcp_OutRsts).node.node,
&SYNC_NODE_NAME(tcp_HCInSegs).node.node,
&SYNC_NODE_NAME(tcp_HCOutSegs).node.node,
&SYNC_NODE_NAME(tcp_ListenerTable).node.node
};
static const struct snmp_tree_node tcp_root = SNMP_CREATE_TREE_NODE(6, tcp_nodes);
#endif /* LWIP_TCP && LWIP_IPV4 */
#endif /* LWIP_TCP */
/* --- icmp .1.3.6.1.2.1.5 ----------------------------------------------------- */
#if LWIP_ICMP
@ -1765,7 +1790,8 @@ icmp_get_value(const struct snmp_scalar_array_node_def *node, void *value)
/* --- tcp .1.3.6.1.2.1.6 ----------------------------------------------------- */
#if LWIP_TCP && LWIP_IPV4
#if LWIP_TCP
static u16_t
tcp_get_value(struct snmp_node_instance* instance, void* value)
{
@ -1830,6 +1856,12 @@ tcp_get_value(struct snmp_node_instance* instance, void* value)
case 15: /* tcpOutRsts */
*uint_ptr = STATS_GET(mib2.tcpoutrsts);
return sizeof(*uint_ptr);
case 17: /* tcpHCInSegs */
memset(value, 0, 2*sizeof(u32_t)); /* not supported */
return 2*sizeof(u32_t);
case 18: /* tcpHCOutSegs */
memset(value, 0, 2*sizeof(u32_t)); /* not supported */
return 2*sizeof(u32_t);
default:
LWIP_DEBUGF(SNMP_MIB_DEBUG,("tcp_get_value(): unknown id: %"S32_F"\n", instance->node->oid));
break;
@ -1840,6 +1872,8 @@ tcp_get_value(struct snmp_node_instance* instance, void* value)
/* --- tcpConnTable --- */
#if LWIP_IPV4
/* list of allowed value ranges for incoming OID */
static const struct snmp_oid_range tcp_ConnTable_oid_ranges[] = {
{ 0, 0xff }, /* IP A */
@ -1997,7 +2031,109 @@ tcp_ConnTable_get_next_cell_instance_and_value(const u32_t* column, struct snmp_
return SNMP_ERR_NOSUCHINSTANCE;
}
#endif /* LWIP_TCP && LWIP_IPV4 */
#endif /* LWIP_IPV4 */
/* --- tcpListenerTable --- */
static snmp_err_t
tcp_ListenerTable_get_cell_value_core(const u32_t* column, union snmp_variant_value* value)
{
/* all items except tcpListenerProcess are declared as not-accessible */
switch (*column) {
case 4: /* tcpListenerProcess */
value->u32 = 0; /* not supported */
break;
default:
return SNMP_ERR_NOSUCHINSTANCE;
}
return SNMP_ERR_NOERROR;
}
static snmp_err_t
tcp_ListenerTable_get_cell_value(const u32_t* column, const u32_t* row_oid, u8_t row_oid_len, union snmp_variant_value* value, u32_t* value_len)
{
ip_addr_t local_ip;
u16_t local_port;
struct tcp_pcb_listen *pcb;
int index = 0;
LWIP_UNUSED_ARG(value_len);
/* tcpListenerLocalAddressType + tcpListenerLocalAddress */
index += snmp_oid_to_ip(&row_oid[index], row_oid_len-index, &local_ip);
if(index == 0) {
return SNMP_ERR_NOSUCHINSTANCE;
}
/* tcpListenerLocalPort */
if(row_oid_len < (index+1)) {
return SNMP_ERR_NOSUCHINSTANCE;
}
if(row_oid[index] > 0xffff) {
return SNMP_ERR_NOSUCHINSTANCE;
}
local_port = (u16_t)row_oid[index];
index++;
/* find tcp_pcb with requested ip and port*/
pcb = tcp_listen_pcbs.listen_pcbs;
while (pcb != NULL) {
if(ip_addr_cmp(&local_ip, &pcb->local_ip) &&
(local_port == pcb->local_port)) {
/* fill in object properties */
return tcp_ListenerTable_get_cell_value_core(column, value);
}
pcb = pcb->next;
}
/* not found */
return SNMP_ERR_NOSUCHINSTANCE;
}
static snmp_err_t
tcp_ListenerTable_get_next_cell_instance_and_value(const u32_t* column, struct snmp_obj_id* row_oid, union snmp_variant_value* value, u32_t* value_len)
{
struct tcp_pcb_listen *pcb;
struct snmp_next_oid_state state;
/* 1x tcpListenerLocalAddressType + 16x tcpListenerLocalAddress + 1x tcpListenerLocalPort */
u32_t result_temp[18];
LWIP_UNUSED_ARG(value_len);
/* init struct to search next oid */
snmp_next_oid_init(&state, row_oid->id, row_oid->len, result_temp, LWIP_ARRAYSIZE(result_temp));
/* iterate over all possible OIDs to find the next one */
pcb = tcp_listen_pcbs.listen_pcbs;
while (pcb != NULL) {
u8_t index = 0;
u32_t test_oid[LWIP_ARRAYSIZE(result_temp)];
/* tcpListenerLocalAddressType + tcpListenerLocalAddress */
index += snmp_ip_to_oid(&pcb->local_ip, &test_oid[index]);
test_oid[index] = pcb->local_port; /* tcpListenerLocalPort */
index++;
/* check generated OID: is it a candidate for the next one? */
snmp_next_oid_check(&state, test_oid, index, NULL);
pcb = pcb->next;
}
/* did we find a next one? */
if(state.status == SNMP_NEXT_OID_STATUS_SUCCESS) {
snmp_oid_assign(row_oid, state.next_oid, state.next_oid_len);
/* fill in object properties */
return tcp_ListenerTable_get_cell_value_core(column, value);
} else {
/* not found */
return SNMP_ERR_NOSUCHINSTANCE;
}
}
#endif /* LWIP_TCP */
/* --- udp .1.3.6.1.2.1.7 ----------------------------------------------------- */
@ -2157,7 +2293,7 @@ udp_endpointTable_get_next_cell_instance_and_value(const u32_t* column, struct s
index++;
/* check generated OID: is it a candidate for the next one? */
snmp_next_oid_check(&state, test_oid, index, pcb);
snmp_next_oid_check(&state, test_oid, index, NULL);
pcb = pcb->next;
}