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SNMP MIB2: Implement tcpConnectionTable

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This commit is contained in:
Dirk Ziegelmeier 2016-01-02 20:55:14 +01:00
parent e1e7a704e1
commit 19d17adcfb
1 changed files with 150 additions and 1 deletions
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151
src/apps/snmp/snmp_mib2.c
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@ -247,6 +247,18 @@ 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_ConnectionTable_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_ConnectionTable_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_ConnectionTable_columns[] = {
/* all items except tcpConnectionState and tcpConnectionProcess are declared as not-accessible */
{ 7, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 }, /* tcpConnectionState */
{ 8, SNMP_ASN1_TYPE_INTEGER, SNMP_VARIANT_VALUE_TYPE_U32 } /* tcpConnectionProcess */
};
static const struct snmp_table_simple_node tcp_ConnectionTable = SNMP_TABLE_CREATE_SIMPLE(19, tcp_ConnectionTable_columns, tcp_ConnectionTable_get_cell_value, tcp_ConnectionTable_get_next_cell_instance_and_value);
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);
@ -277,6 +289,7 @@ 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(19, tcp_ConnectionTable)
CREATE_LWIP_SYNC_NODE(20, tcp_ListenerTable)
static const struct snmp_node* tcp_nodes[] = {
@ -299,6 +312,7 @@ static const struct snmp_node* tcp_nodes[] = {
&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_ConnectionTable).node.node,
&SYNC_NODE_NAME(tcp_ListenerTable).node.node
};
@ -2033,6 +2047,141 @@ tcp_ConnTable_get_next_cell_instance_and_value(const u32_t* column, struct snmp_
#endif /* LWIP_IPV4 */
/* --- tcpConnectionTable --- */
static snmp_err_t
tcp_ConnectionTable_get_cell_value_core(const u32_t* column, struct tcp_pcb *pcb, union snmp_variant_value* value)
{
/* all items except tcpConnectionStatea and tcpListenerProcess are declared as not-accessible */
switch (*column) {
case 7: /* tcpConnectionState */
value->u32 = pcb->state + 1;
break;
case 8: /* tcpListenerProcess */
value->u32 = 0; /* not supported */
break;
default:
return SNMP_ERR_NOSUCHINSTANCE;
}
return SNMP_ERR_NOERROR;
}
static snmp_err_t
tcp_ConnectionTable_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, remote_ip;
u16_t local_port, remote_port;
struct tcp_pcb *pcb;
u8_t index = 0;
u8_t i;
struct tcp_pcb ** const tcp_pcb_nonlisten_lists[] = {&tcp_bound_pcbs, &tcp_active_pcbs, &tcp_tw_pcbs};
LWIP_UNUSED_ARG(value_len);
/* tcpConnectionLocalAddressType + tcpConnectionLocalAddress */
index += snmp_oid_to_ip(&row_oid[index], row_oid_len-index, &local_ip);
if(index == 0) {
return SNMP_ERR_NOSUCHINSTANCE;
}
/* tcpConnectionLocalPort */
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++;
/* tcpConnectionRemAddressType + tcpConnectionRemAddress */
index += snmp_oid_to_ip(&row_oid[index], row_oid_len-index, &remote_ip);
if(index == 0) {
return SNMP_ERR_NOSUCHINSTANCE;
}
/* tcpConnectionRemPort */
if(row_oid_len < (index+1)) {
return SNMP_ERR_NOSUCHINSTANCE;
}
if(row_oid[index] > 0xffff) {
return SNMP_ERR_NOSUCHINSTANCE;
}
remote_port = (u16_t)row_oid[index];
/* find tcp_pcb with requested ip and port*/
for(i=0; i<LWIP_ARRAYSIZE(tcp_pcb_nonlisten_lists); i++) {
pcb = *tcp_pcb_nonlisten_lists[i];
while (pcb != NULL) {
if(ip_addr_cmp(&local_ip, &pcb->local_ip) &&
(local_port == pcb->local_port) &&
ip_addr_cmp(&remote_ip, &pcb->remote_ip) &&
(remote_port == pcb->remote_port)) {
/* fill in object properties */
return tcp_ConnectionTable_get_cell_value_core(column, pcb, value);
}
pcb = pcb->next;
}
}
/* not found */
return SNMP_ERR_NOSUCHINSTANCE;
}
static snmp_err_t
tcp_ConnectionTable_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 *pcb;
struct snmp_next_oid_state state;
/* 1x tcpConnectionLocalAddressType + 16x tcpConnectionLocalAddress + 1x tcpConnectionLocalPort
* 1x tcpConnectionRemAddressType + 16x tcpConnectionRemAddress + 1x tcpConnectionRemPort */
u32_t result_temp[36];
u8_t i;
struct tcp_pcb ** const tcp_pcb_nonlisten_lists[] = {&tcp_bound_pcbs, &tcp_active_pcbs, &tcp_tw_pcbs};
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 */
for(i=0; i<LWIP_ARRAYSIZE(tcp_pcb_nonlisten_lists); i++) {
pcb = *tcp_pcb_nonlisten_lists[i];
while (pcb != NULL) {
u8_t index = 0;
u32_t test_oid[LWIP_ARRAYSIZE(result_temp)];
/* tcpConnectionLocalAddressType + tcpConnectionLocalAddress */
index += snmp_ip_to_oid(&pcb->local_ip, &test_oid[index]);
test_oid[index] = pcb->local_port; /* tcpConnectionLocalPort */
index++;
/* tcpConnectionRemAddressType + tcpConnectionRemAddress */
index += snmp_ip_to_oid(&pcb->remote_ip, &test_oid[index]);
test_oid[index] = pcb->remote_port; /* tcpConnectionRemPort */
index++;
/* check generated OID: is it a candidate for the next one? */
snmp_next_oid_check(&state, test_oid, index, pcb);
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_ConnectionTable_get_cell_value_core(column, (struct tcp_pcb*)state.reference, value);
} else {
/* not found */
return SNMP_ERR_NOSUCHINSTANCE;
}
}
/* --- tcpListenerTable --- */
static snmp_err_t
@ -2056,7 +2205,7 @@ tcp_ListenerTable_get_cell_value(const u32_t* column, const u32_t* row_oid, u8_t
ip_addr_t local_ip;
u16_t local_port;
struct tcp_pcb_listen *pcb;
int index = 0;
u8_t index = 0;
LWIP_UNUSED_ARG(value_len);