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-rw-r--r--src/plugins/acl/acl.c96
-rw-r--r--src/plugins/acl/acl.h9
-rw-r--r--src/plugins/acl/fa_node.c25
-rw-r--r--src/plugins/acl/fa_node.h8
4 files changed, 128 insertions, 10 deletions
diff --git a/src/plugins/acl/acl.c b/src/plugins/acl/acl.c
index 7c2572d869d..90b369e3296 100644
--- a/src/plugins/acl/acl.c
+++ b/src/plugins/acl/acl.c
@@ -305,6 +305,45 @@ warning_acl_print_acl (vlib_main_t * vm, acl_main_t * am, int acl_index)
acl_print_acl_x (print_clib_warning_and_reset, vm, am, acl_index);
}
+static void
+increment_policy_epoch (acl_main_t * am, u32 sw_if_index, int is_input)
+{
+
+ u32 **ppolicy_epoch_by_swi =
+ is_input ? &am->input_policy_epoch_by_sw_if_index :
+ &am->output_policy_epoch_by_sw_if_index;
+ vec_validate (*ppolicy_epoch_by_swi, sw_if_index);
+
+ u32 *p_epoch = vec_elt_at_index ((*ppolicy_epoch_by_swi), sw_if_index);
+ *p_epoch =
+ ((1 + *p_epoch) & FA_POLICY_EPOCH_MASK) +
+ (is_input * FA_POLICY_EPOCH_IS_INPUT);
+}
+
+static void
+try_increment_acl_policy_epoch (acl_main_t * am, u32 acl_num, int is_input)
+{
+ u32 ***p_swi_vec_by_acl = is_input ? &am->input_sw_if_index_vec_by_acl
+ : &am->output_sw_if_index_vec_by_acl;
+ if (acl_num < vec_len (*p_swi_vec_by_acl))
+ {
+ u32 *p_swi;
+ vec_foreach (p_swi, (*p_swi_vec_by_acl)[acl_num])
+ {
+ increment_policy_epoch (am, *p_swi, is_input);
+ }
+
+ }
+}
+
+static void
+policy_notify_acl_change (acl_main_t * am, u32 acl_num)
+{
+ try_increment_acl_policy_epoch (am, acl_num, 0);
+ try_increment_acl_policy_epoch (am, acl_num, 1);
+}
+
+
static int
acl_add_list (u32 count, vl_api_acl_rule_t rules[],
@@ -392,6 +431,12 @@ acl_add_list (u32 count, vl_api_acl_rule_t rules[],
memcpy (a->tag, tag, sizeof (a->tag));
if (am->trace_acl > 255)
warning_acl_print_acl (am->vlib_main, am, *acl_list_index);
+ if (am->reclassify_sessions)
+ {
+ /* a change in an ACLs if they are applied may mean a new policy epoch */
+ policy_notify_acl_change (am, *acl_list_index);
+ }
+
/* notify the lookup contexts about the ACL changes */
acl_plugin_lookup_context_notify_acl_change (*acl_list_index);
clib_mem_set_heap (oldheap);
@@ -1268,12 +1313,20 @@ acl_interface_set_inout_acl_list (acl_main_t * am, u32 sw_if_index,
(*pinout_acl_vec_by_sw_if_index)[sw_if_index] =
vec_dup (vec_acl_list_index);
- /* if no commonalities between the ACL# - then we should definitely clear the sessions */
- if (may_clear_sessions && *may_clear_sessions
- && !clib_bitmap_is_zero (change_acl_bitmap))
+ if (am->reclassify_sessions)
+ {
+ /* re-applying ACLs means a new policy epoch */
+ increment_policy_epoch (am, sw_if_index, is_input);
+ }
+ else
{
- acl_clear_sessions (am, sw_if_index);
- *may_clear_sessions = 0;
+ /* if no commonalities between the ACL# - then we should definitely clear the sessions */
+ if (may_clear_sessions && *may_clear_sessions
+ && !clib_bitmap_is_zero (change_acl_bitmap))
+ {
+ acl_clear_sessions (am, sw_if_index);
+ *may_clear_sessions = 0;
+ }
}
/*
@@ -3202,6 +3255,11 @@ acl_set_aclplugin_fn (vlib_main_t * vm,
am->l4_match_nonfirst_fragment = (val != 0);
goto done;
}
+ if (unformat (input, "reclassify-sessions %u", &val))
+ {
+ am->reclassify_sessions = (val != 0);
+ goto done;
+ }
if (unformat (input, "event-trace"))
{
if (!unformat (input, "%u", &val))
@@ -3571,6 +3629,15 @@ acl_plugin_show_interface (acl_main_t * am, u32 sw_if_index, int show_acl,
continue;
vlib_cli_output (vm, "sw_if_index %d:\n", swi);
+ if (swi < vec_len (am->input_policy_epoch_by_sw_if_index))
+ vlib_cli_output (vm, " input policy epoch: %x\n",
+ vec_elt (am->input_policy_epoch_by_sw_if_index,
+ swi));
+ if (swi < vec_len (am->output_policy_epoch_by_sw_if_index))
+ vlib_cli_output (vm, " output policy epoch: %x\n",
+ vec_elt (am->output_policy_epoch_by_sw_if_index,
+ swi));
+
if (intf_has_etype_whitelist (am, swi, 1))
{
@@ -3761,13 +3828,21 @@ acl_plugin_show_sessions (acl_main_t * am,
?
pw->fa_session_dels_by_sw_if_index
[sw_if_index] : 0;
+ u64 n_epoch_changes =
+ sw_if_index <
+ vec_len
+ (pw->fa_session_epoch_change_by_sw_if_index)
+ ?
+ pw->fa_session_epoch_change_by_sw_if_index
+ [sw_if_index] : 0;
vlib_cli_output (vm,
- " sw_if_index %d: add %lu - del %lu = %lu",
+ " sw_if_index %d: add %lu - del %lu = %lu; epoch chg: %lu",
sw_if_index,
n_adds,
n_dels,
n_adds -
- n_dels);
+ n_dels,
+ n_epoch_changes);
}
));
@@ -3829,6 +3904,7 @@ acl_plugin_show_sessions (acl_main_t * am,
am->fa_cleaner_wait_time_increment * 1000.0,
((f64) am->fa_current_cleaner_timer_wait_interval) *
1000.0 / (f64) vm->clib_time.clocks_per_second);
+ vlib_cli_output (vm, "Reclassify sessions: %d", am->reclassify_sessions);
}
static clib_error_t *
@@ -4007,6 +4083,7 @@ acl_plugin_config (vlib_main_t * vm, unformat_input_t * input)
uword hash_heap_size;
u32 hash_lookup_hash_buckets;
u32 hash_lookup_hash_memory;
+ u32 reclassify_sessions;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
@@ -4035,6 +4112,10 @@ acl_plugin_config (vlib_main_t * vm, unformat_input_t * input)
else if (unformat (input, "hash lookup hash memory %d",
&hash_lookup_hash_memory))
am->hash_lookup_hash_memory = hash_lookup_hash_memory;
+ else if (unformat (input, "reclassify sessions %d",
+ &reclassify_sessions))
+ am->reclassify_sessions = reclassify_sessions;
+
else
return clib_error_return (0, "unknown input '%U'",
format_unformat_error, input);
@@ -4086,6 +4167,7 @@ acl_init (vlib_main_t * vm)
am->fa_conn_table_hash_memory_size =
ACL_FA_CONN_TABLE_DEFAULT_HASH_MEMORY_SIZE;
am->fa_conn_table_max_entries = ACL_FA_CONN_TABLE_DEFAULT_MAX_ENTRIES;
+ am->reclassify_sessions = 0;
vlib_thread_main_t *tm = vlib_get_thread_main ();
vec_validate (am->per_worker_data, tm->n_vlib_mains - 1);
{
diff --git a/src/plugins/acl/acl.h b/src/plugins/acl/acl.h
index 2d4dc551470..7af5b201551 100644
--- a/src/plugins/acl/acl.h
+++ b/src/plugins/acl/acl.h
@@ -186,6 +186,15 @@ typedef struct {
/* lookup contexts where a given ACL is used */
u32 **lc_index_vec_by_acl;
+ /* input and output policy epochs by interface */
+ u32 *input_policy_epoch_by_sw_if_index;
+ u32 *output_policy_epoch_by_sw_if_index;
+
+ /* whether we need to take the epoch of the session into account */
+ int reclassify_sessions;
+
+
+
/* Total count of interface+direction pairs enabled */
u32 fa_total_enabled_count;
diff --git a/src/plugins/acl/fa_node.c b/src/plugins/acl/fa_node.c
index d29576a4bce..833b0fa1523 100644
--- a/src/plugins/acl/fa_node.c
+++ b/src/plugins/acl/fa_node.c
@@ -589,7 +589,7 @@ acl_fa_try_recycle_session (acl_main_t * am, int is_input, u16 thread_index, u32
static fa_session_t *
acl_fa_add_session (acl_main_t * am, int is_input, u32 sw_if_index, u64 now,
- fa_5tuple_t * p5tuple)
+ fa_5tuple_t * p5tuple, u16 current_policy_epoch)
{
clib_bihash_kv_40_8_t *pkv = &p5tuple->kv;
clib_bihash_kv_40_8_t kv;
@@ -603,6 +603,7 @@ acl_fa_add_session (acl_main_t * am, int is_input, u32 sw_if_index, u64 now,
pool_get_aligned (pw->fa_sessions_pool, sess, CLIB_CACHE_LINE_BYTES);
f_sess_id.session_index = sess - pw->fa_sessions_pool;
+ f_sess_id.intf_policy_epoch = current_policy_epoch;
kv.key[0] = pkv->key[0];
kv.key[1] = pkv->key[1];
@@ -662,6 +663,7 @@ acl_fa_node_fn (vlib_main_t * vm,
vlib_node_runtime_t *error_node;
u64 now = clib_cpu_time_now ();
uword thread_index = os_get_thread_index ();
+ acl_fa_per_worker_data_t *pw = &am->per_worker_data[thread_index];
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
@@ -709,6 +711,10 @@ acl_fa_node_fn (vlib_main_t * vm,
lc_index0 = am->input_lc_index_by_sw_if_index[sw_if_index0];
else
lc_index0 = am->output_lc_index_by_sw_if_index[sw_if_index0];
+
+ u32 **p_epoch_vec = is_input ? &am->input_policy_epoch_by_sw_if_index
+ : &am->output_policy_epoch_by_sw_if_index;
+ u16 current_policy_epoch = sw_if_index0 < vec_len(*p_epoch_vec) ? vec_elt(*p_epoch_vec, sw_if_index0) : (is_input * FA_POLICY_EPOCH_IS_INPUT);
/*
* Extract the L3/L4 matching info into a 5-tuple structure,
* then create a session key whose layout is independent on forward or reverse
@@ -782,6 +788,21 @@ acl_fa_node_fn (vlib_main_t * vm,
acl_check_needed = 0;
action = 0;
}
+ if (PREDICT_FALSE(am->reclassify_sessions)) {
+ /* if the MSB of policy epoch matches but not the LSB means it is a stale session */
+ if ( (0 == ((current_policy_epoch ^ f_sess_id.intf_policy_epoch) & FA_POLICY_EPOCH_IS_INPUT))
+ && (current_policy_epoch != f_sess_id.intf_policy_epoch) ) {
+ /* delete session and increment the counter */
+ vec_validate (pw->fa_session_epoch_change_by_sw_if_index, sw_if_index0);
+ vec_elt (pw->fa_session_epoch_change_by_sw_if_index, sw_if_index0)++;
+ if(acl_fa_conn_list_delete_session(am, f_sess_id)) {
+ /* delete the session only if we were able to unlink it */
+ acl_fa_delete_session (am, sw_if_index0, f_sess_id);
+ }
+ acl_check_needed = 1;
+ trace_bitmap |= 0x40000000;
+ }
+ }
}
}
@@ -804,7 +825,7 @@ acl_fa_node_fn (vlib_main_t * vm,
if (PREDICT_TRUE (valid_new_sess)) {
fa_session_t *sess = acl_fa_add_session (am, is_input,
sw_if_index0,
- now, &kv_sess);
+ now, &kv_sess, current_policy_epoch);
acl_fa_track_session (am, is_input, sw_if_index0, now,
sess, &fa_5tuple);
pkts_new_session += 1;
diff --git a/src/plugins/acl/fa_node.h b/src/plugins/acl/fa_node.h
index dc4f87f0eb1..263cf1431e6 100644
--- a/src/plugins/acl/fa_node.h
+++ b/src/plugins/acl/fa_node.h
@@ -76,6 +76,10 @@ typedef struct {
u64 reserved2[5]; /* +5*8 bytes = 64 */
} fa_session_t;
+#define FA_POLICY_EPOCH_MASK 0x7fff
+/* input policy epochs have the MSB set */
+#define FA_POLICY_EPOCH_IS_INPUT 0x8000
+
/* This structure is used to fill in the u64 value
in the per-sw-if-index hash table */
@@ -85,7 +89,7 @@ typedef struct {
struct {
u32 session_index;
u16 thread_index;
- u16 reserved0;
+ u16 intf_policy_epoch;
};
};
} fa_full_session_id_t;
@@ -117,6 +121,8 @@ typedef struct {
/* adds and deletes per-worker-per-interface */
u64 *fa_session_dels_by_sw_if_index;
u64 *fa_session_adds_by_sw_if_index;
+ /* sessions deleted due to epoch change */
+ u64 *fa_session_epoch_change_by_sw_if_index;
/* Vector of expired connections retrieved from lists */
u32 *expired;
/* the earliest next expiry time */