#include <vppinfra/vec.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
+#include <vnet/ip/ip.api_enum.h>
#include <vppinfra/fifo.h>
#include <vppinfra/bihash_16_8.h>
#include <vnet/ip/reass/ip4_full_reass.h>
#include <stddef.h>
#define MSEC_PER_SEC 1000
-#define IP4_REASS_TIMEOUT_DEFAULT_MS 100
-#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
+#define IP4_REASS_TIMEOUT_DEFAULT_MS 200
+
+/* As there are only 1024 reass context per thread, either the DDOS attacks
+ * or fractions of real timeouts, would consume these contexts quickly and
+ * running out context space and unable to perform reassembly */
+#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 50 // 50 ms default
#define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
#define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
#define IP4_REASS_HT_LOAD_FACTOR (0.75)
ip4_full_reass_t *pool;
u32 reass_n;
u32 id_counter;
+ // for pacing the main thread timeouts
+ u32 last_id;
clib_spinlock_t lock;
} ip4_full_reass_per_thread_t;
if (~0 != bi)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
- if ((b->flags & VLIB_BUFFER_IS_TRACED))
+ if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, reass, bi,
RANGE_DISCARD, 0, ~0);
return frame->n_vectors;
}
-static char *ip4_full_reass_error_strings[] = {
-#define _(sym, string) string,
- foreach_ip4_error
-#undef _
-};
-
VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
.name = "ip4-full-reassembly",
.vector_size = sizeof (u32),
.format_trace = format_ip4_full_reass_trace,
- .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
- .error_strings = ip4_full_reass_error_strings,
+ .n_errors = IP4_N_ERROR,
+ .error_counters = ip4_error_counters,
.n_next_nodes = IP4_FULL_REASS_N_NEXT,
.next_nodes =
{
.name = "ip4-local-full-reassembly",
.vector_size = sizeof (u32),
.format_trace = format_ip4_full_reass_trace,
- .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
- .error_strings = ip4_full_reass_error_strings,
+ .n_errors = IP4_N_ERROR,
+ .error_counters = ip4_error_counters,
.n_next_nodes = IP4_FULL_REASS_N_NEXT,
.next_nodes =
{
.name = "ip4-full-reassembly-feature",
.vector_size = sizeof (u32),
.format_trace = format_ip4_full_reass_trace,
- .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
- .error_strings = ip4_full_reass_error_strings,
+ .n_errors = IP4_N_ERROR,
+ .error_counters = ip4_error_counters,
.n_next_nodes = IP4_FULL_REASS_N_NEXT,
.next_nodes =
{
.name = "ip4-full-reassembly-custom",
.vector_size = sizeof (u32),
.format_trace = format_ip4_full_reass_trace,
- .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
- .error_strings = ip4_full_reass_error_strings,
+ .n_errors = IP4_N_ERROR,
+ .error_counters = ip4_error_counters,
.n_next_nodes = IP4_FULL_REASS_N_NEXT,
.next_nodes =
{
vec_reset_length (pool_indexes_to_free);
- pool_foreach_index (index, rt->pool)
+ /* Pace the number of timeouts handled per thread,to avoid barrier
+ * sync issues in real world scenarios */
+
+ u32 beg = rt->last_id;
+ /* to ensure we walk at least once per sec per context */
+ u32 end =
+ beg + (IP4_REASS_MAX_REASSEMBLIES_DEFAULT *
+ IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS / MSEC_PER_SEC +
+ 1);
+ if (end > vec_len (rt->pool))
{
- reass = pool_elt_at_index (rt->pool, index);
- if (now > reass->last_heard + rm->timeout)
- {
- vec_add1 (pool_indexes_to_free, index);
- }
+ end = vec_len (rt->pool);
+ rt->last_id = 0;
+ }
+ else
+ {
+ rt->last_id = end;
}
+ pool_foreach_stepping_index (index, beg, end, rt->pool)
+ {
+ reass = pool_elt_at_index (rt->pool, index);
+ if (now > reass->last_heard + rm->timeout)
+ {
+ vec_add1 (pool_indexes_to_free, index);
+ }
+ }
+
if (vec_len (pool_indexes_to_free))
vlib_node_increment_counter (vm, node->node_index,
IP4_ERROR_REASS_TIMEOUT,
}
VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = {
- .function = ip4_full_reass_walk_expired,
- .type = VLIB_NODE_TYPE_PROCESS,
- .name = "ip4-full-reassembly-expire-walk",
- .format_trace = format_ip4_full_reass_trace,
- .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
- .error_strings = ip4_full_reass_error_strings,
-
+ .function = ip4_full_reass_walk_expired,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "ip4-full-reassembly-expire-walk",
+ .format_trace = format_ip4_full_reass_trace,
+ .n_errors = IP4_N_ERROR,
+ .error_counters = ip4_error_counters,
};
static u8 *