#define IP4_REASS_TIMEOUT_DEFAULT_MS 100
#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
#define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
+#define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
#define IP4_REASS_HT_LOAD_FACTOR (0.75)
#define IP4_REASS_DEBUG_BUFFERS 0
typedef enum
{
IP4_REASS_RC_OK,
+ IP4_REASS_RC_TOO_MANY_FRAGMENTS,
IP4_REASS_RC_INTERNAL_ERROR,
IP4_REASS_RC_NO_BUF,
} ip4_reass_rc_t;
u8 next_index;
// minimum fragment length for this reassembly - used to estimate MTU
u16 min_fragment_length;
-
+ // number of fragments in this reassembly
+ u32 fragments_n;
} ip4_reass_t;
typedef struct
u32 timeout_ms;
f64 timeout;
u32 expire_walk_interval_ms;
+ // maximum number of fragments in one reassembly
+ u32 max_reass_len;
+ // maximum number of reassemblies
u32 max_reass_n;
// IPv4 runtime
}
*bi0 = ~0;
reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
+ reass->fragments_n = 1;
return IP4_REASS_RC_OK;
}
reass->min_fragment_length = clib_min (clib_net_to_host_u16 (fip->length),
}
break;
}
+ ++reass->fragments_n;
if (consumed)
{
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
if (consumed)
{
*bi0 = ~0;
+ if (reass->fragments_n > rm->max_reass_len)
+ {
+ rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
+ }
}
else
{
case IP4_REASS_RC_OK:
/* nothing to do here */
break;
+ case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
+ vlib_node_increment_counter (vm, node->node_index,
+ IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
+ 1);
+ ip4_reass_on_timeout (vm, rm, reass);
+ ip4_reass_free (rm, rt, reass);
+ goto next_packet;
+ break;
case IP4_REASS_RC_NO_BUF:
- /* fallthrough */
+ vlib_node_increment_counter (vm, node->node_index,
+ IP4_ERROR_REASS_NO_BUF,
+ 1);
+ ip4_reass_on_timeout (vm, rm, reass);
+ ip4_reass_free (rm, rt, reass);
+ goto next_packet;
+ break;
case IP4_REASS_RC_INTERNAL_ERROR:
- /* drop everything and start with a clean slate */
+ vlib_node_increment_counter (vm, node->node_index,
+ IP4_ERROR_REASS_INTERNAL_ERROR,
+ 1);
ip4_reass_on_timeout (vm, rm, reass);
ip4_reass_free (rm, rt, reass);
goto next_packet;
static void
ip4_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
- u32 expire_walk_interval_ms)
+ u32 max_reassembly_length, u32 expire_walk_interval_ms)
{
ip4_reass_main.timeout_ms = timeout_ms;
ip4_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
ip4_reass_main.max_reass_n = max_reassemblies;
+ ip4_reass_main.max_reass_len = max_reassembly_length;
ip4_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
}
vnet_api_error_t
ip4_reass_set (u32 timeout_ms, u32 max_reassemblies,
- u32 expire_walk_interval_ms)
+ u32 max_reassembly_length, u32 expire_walk_interval_ms)
{
u32 old_nbuckets = ip4_reass_get_nbuckets ();
- ip4_reass_set_params (timeout_ms, max_reassemblies,
+ ip4_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length,
expire_walk_interval_ms);
vlib_process_signal_event (ip4_reass_main.vlib_main,
ip4_reass_main.ip4_reass_expire_node_idx,
vnet_api_error_t
ip4_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
- u32 * expire_walk_interval_ms)
+ u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
{
*timeout_ms = ip4_reass_main.timeout_ms;
*max_reassemblies = ip4_reass_main.max_reass_n;
+ *max_reassembly_length = ip4_reass_main.max_reass_len;
*expire_walk_interval_ms = ip4_reass_main.expire_walk_interval_ms;
return 0;
}
ip4_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
+ IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
nbuckets = ip4_reass_get_nbuckets ();