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isisd: fix circuit state machine

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isisd has a so-called circuit state machine that takes care about
the interface state changes, such as initializing, down, up. When
an interface was brought down by a link failure, the interface
information was deleted and set to NULL. When the link was restored
later, the interface was looked up by the old pointer, but since it
was cleared, it was never found again, resulting in an interface
never entering the up state again.

Also, the program regularly crashed because of a deleted pointer in
the same context which was later accessed without any further
checking.

Signed-off-by: Fritz Reichmann <fritz@reichmann.nl>
This commit is contained in:
Peter Szilagyi 2011-10-01 17:11:45 +04:00 committed by Denis Ovsienko
parent 4c0cf00afc
commit 7fd6cd819f
5 changed files with 81 additions and 66 deletions
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2
isisd/isis_adjacency.c
View file

@ -172,7 +172,7 @@ isis_adj_state_change (struct isis_adjacency *adj, enum isis_adj_state state,
circuit->upadjcount[level - 1]++;
if (state == ISIS_ADJ_DOWN)
{
isis_delete_adj (adj, adj->circuit->u.bc.adjdb[level - 1]);
listnode_delete (adj->circuit->u.bc.adjdb[level - 1], adj);
circuit->upadjcount[level - 1]--;
}

1
isisd/isis_circuit.h
View file

@ -65,6 +65,7 @@ struct isis_p2p_info
struct isis_circuit
{
int state;
int connected;
u_char circuit_id; /* l1/l2 p2p/bcast CircuitID */
struct isis_area *area; /* back pointer to the area */
struct interface *interface; /* interface info from z */

9
isisd/isis_csm.c
View file

@ -112,6 +112,7 @@ isis_csm_state_change (int event, struct isis_circuit *circuit, void *arg)
isis_circuit_configure (circuit, (struct isis_area *) arg);
isis_circuit_up (circuit);
circuit->state = C_STATE_UP;
circuit->connected = 1;
isis_event_circuit_state_change (circuit, 1);
listnode_delete (isis->init_circ_list, circuit);
break;
@ -136,9 +137,12 @@ isis_csm_state_change (int event, struct isis_circuit *circuit, void *arg)
zlog_warn ("circuit already enabled");
break;
case IF_UP_FROM_Z:
isis_circuit_if_add (circuit, (struct interface *) arg);
isis_circuit_up (circuit);
if (!circuit->connected) {
isis_circuit_if_add (circuit, (struct interface *) arg);
isis_circuit_up (circuit);
}
circuit->state = C_STATE_UP;
circuit->connected = 1;
isis_event_circuit_state_change (circuit, 1);
break;
case ISIS_DISABLE:
@ -167,7 +171,6 @@ isis_csm_state_change (int event, struct isis_circuit *circuit, void *arg)
isis_event_circuit_state_change (circuit, 0);
break;
case IF_DOWN_FROM_Z:
isis_circuit_if_del (circuit);
circuit->state = C_STATE_CONF;
isis_event_circuit_state_change (circuit, 0);
break;

2
isisd/isis_lsp.c
View file

@ -2037,6 +2037,8 @@ lsp_tick (struct thread *thread)
{
for (ALL_LIST_ELEMENTS_RO (area->circuit_list, cnode, circuit))
{
if (circuit->state != C_STATE_UP)
continue;
for (ALL_LIST_ELEMENTS_RO (lsp_list, lspnode, lsp))
{
if (ISIS_CHECK_FLAG (lsp->SRMflags, circuit))

133
isisd/isis_pdu.c
View file

@ -1916,6 +1916,9 @@ send_hello (struct isis_circuit *circuit, int level)
unsigned long len_pointer, length;
int retval;
if (circuit->state != C_STATE_UP || circuit->interface == NULL)
return ISIS_WARNING;
if (circuit->interface->mtu == 0)
{
zlog_warn ("circuit has zero MTU");
@ -2222,6 +2225,9 @@ send_csnp (struct isis_circuit *circuit, int level)
struct listnode *node;
struct isis_lsp *lsp;
if (circuit->state != C_STATE_UP || circuit->interface == NULL)
return ISIS_WARNING;
memset (start, 0x00, ISIS_SYS_ID_LEN + 2);
memset (stop, 0xff, ISIS_SYS_ID_LEN + 2);
@ -2387,6 +2393,9 @@ send_psnp (int level, struct isis_circuit *circuit)
struct list *list = NULL;
struct listnode *node;
if (circuit->state != C_STATE_UP || circuit->interface == NULL)
return ISIS_WARNING;
if ((circuit->circ_type == CIRCUIT_T_BROADCAST &&
!circuit->u.bc.is_dr[level - 1]) ||
circuit->circ_type != CIRCUIT_T_BROADCAST)
@ -2493,85 +2502,85 @@ send_lsp (struct thread *thread)
circuit = THREAD_ARG (thread);
assert (circuit);
if (circuit->state == C_STATE_UP)
if (circuit->state != C_STATE_UP || circuit->interface == NULL)
return ISIS_WARNING;
lsp = listgetdata ((node = listhead (circuit->lsp_queue)));
/*
* Do not send if levels do not match
*/
if (!(lsp->level & circuit->circuit_is_type))
goto dontsend;
/*
* Do not send if we do not have adjacencies in state up on the circuit
*/
if (circuit->upadjcount[lsp->level - 1] == 0)
goto dontsend;
/* only send if it needs sending */
if ((time (NULL) - lsp->last_sent) >=
circuit->area->lsp_gen_interval[lsp->level - 1])
{
lsp = listgetdata ((node = listhead (circuit->lsp_queue)));
/*
* Do not send if levels do not match
*/
if (!(lsp->level & circuit->circuit_is_type))
goto dontsend;
/*
* Do not send if we do not have adjacencies in state up on the circuit
*/
if (circuit->upadjcount[lsp->level - 1] == 0)
goto dontsend;
/* only send if it needs sending */
if ((time (NULL) - lsp->last_sent) >=
circuit->area->lsp_gen_interval[lsp->level - 1])
if (isis->debugs & DEBUG_UPDATE_PACKETS)
{
zlog_debug
("ISIS-Upd (%s): Sent L%d LSP %s, seq 0x%08x, cksum 0x%04x,"
" lifetime %us on %s", circuit->area->area_tag, lsp->level,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime),
circuit->interface->name);
}
/* copy our lsp to the send buffer */
stream_copy (circuit->snd_stream, lsp->pdu);
if (isis->debugs & DEBUG_UPDATE_PACKETS)
{
zlog_debug
("ISIS-Upd (%s): Sent L%d LSP %s, seq 0x%08x, cksum 0x%04x,"
" lifetime %us on %s", circuit->area->area_tag, lsp->level,
rawlspid_print (lsp->lsp_header->lsp_id),
ntohl (lsp->lsp_header->seq_num),
ntohs (lsp->lsp_header->checksum),
ntohs (lsp->lsp_header->rem_lifetime),
circuit->interface->name);
}
/* copy our lsp to the send buffer */
stream_copy (circuit->snd_stream, lsp->pdu);
retval = circuit->tx (circuit, lsp->level);
retval = circuit->tx (circuit, lsp->level);
/*
* If the sending succeeded, we can del the lsp from circuits
* lsp_queue
*/
if (retval == ISIS_OK)
{
list_delete_node (circuit->lsp_queue, node);
/*
* If the sending succeeded, we can del the lsp from circuits
* lsp_queue
* On broadcast circuits also the SRMflag can be cleared
*/
if (retval == ISIS_OK)
{
list_delete_node (circuit->lsp_queue, node);
if (circuit->circ_type == CIRCUIT_T_BROADCAST)
ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
if (flags_any_set (lsp->SRMflags) == 0)
{
/*
* On broadcast circuits also the SRMflag can be cleared
* need to remember when we were last sent
*/
if (circuit->circ_type == CIRCUIT_T_BROADCAST)
ISIS_CLEAR_FLAG (lsp->SRMflags, circuit);
if (flags_any_set (lsp->SRMflags) == 0)
{
/*
* need to remember when we were last sent
*/
lsp->last_sent = time (NULL);
}
}
else
{
zlog_debug ("sending of level %d link state failed", lsp->level);
lsp->last_sent = time (NULL);
}
}
else
{
/* my belief is that if it wasn't his time, the lsp can be removed
* from the queue
*/
dontsend:
list_delete_node (circuit->lsp_queue, node);
zlog_debug ("sending of level %d link state failed", lsp->level);
}
#if 0
/*
* If there are still LSPs send next one after lsp-interval (33 msecs)
*/
if (listcount (circuit->lsp_queue) > 0)
thread_add_timer (master, send_lsp, circuit, 1);
#endif
}
else
{
/* my belief is that if it wasn't his time, the lsp can be removed
* from the queue
*/
dontsend:
list_delete_node (circuit->lsp_queue, node);
}
#if 0
/*
* If there are still LSPs send next one after lsp-interval (33 msecs)
*/
if (listcount (circuit->lsp_queue) > 0)
thread_add_timer (master, send_lsp, circuit, 1);
#endif
return retval;
}