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-rw-r--r--src/plugins/acl/hash_lookup.c742
1 files changed, 742 insertions, 0 deletions
diff --git a/src/plugins/acl/hash_lookup.c b/src/plugins/acl/hash_lookup.c
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+++ b/src/plugins/acl/hash_lookup.c
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+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <stddef.h>
+#include <netinet/in.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vlibsocket/api.h>
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vppinfra/error.h>
+#include <vnet/plugin/plugin.h>
+#include <acl/acl.h>
+#include <vppinfra/bihash_48_8.h>
+
+#include "hash_lookup.h"
+#include "hash_lookup_private.h"
+
+/*
+ * This returns true if there is indeed a match on the portranges.
+ * With all these levels of indirections, this is not going to be very fast,
+ * so, best use the individual ports or wildcard ports for performance.
+ */
+static int
+match_portranges(acl_main_t *am, fa_5tuple_t *match, u32 index)
+{
+ applied_hash_ace_entry_t **applied_hash_aces = match->pkt.is_input ? &am->input_hash_entry_vec_by_sw_if_index[match->pkt.sw_if_index] :
+ &am->output_hash_entry_vec_by_sw_if_index[match->pkt.sw_if_index];
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[index]);
+
+ // hash_acl_info_t *ha = &am->hash_acl_infos[pae->acl_index];
+ acl_rule_t *r = &(am->acls[pae->acl_index].rules[pae->ace_index]);
+ DBG("PORTMATCH: %d <= %d <= %d && %d <= %d <= %d ?",
+ r->src_port_or_type_first, match->l4.port[0], r->src_port_or_type_last,
+ r->dst_port_or_code_first, match->l4.port[1], r->dst_port_or_code_last);
+
+ return ( ((r->src_port_or_type_first <= match->l4.port[0]) && r->src_port_or_type_last >= match->l4.port[0]) &&
+ ((r->dst_port_or_code_first <= match->l4.port[1]) && r->dst_port_or_code_last >= match->l4.port[1]) );
+}
+
+static u32
+multi_acl_match_get_applied_ace_index(acl_main_t *am, fa_5tuple_t *match)
+{
+ clib_bihash_kv_48_8_t kv;
+ clib_bihash_kv_48_8_t result;
+ fa_5tuple_t *kv_key = (fa_5tuple_t *)kv.key;
+ hash_acl_lookup_value_t *result_val = (hash_acl_lookup_value_t *)&result.value;
+ u64 *pmatch = (u64 *)match;
+ u64 *pmask;
+ u64 *pkey;
+ int mask_type_index;
+ u32 curr_match_index = ~0;
+
+ u32 sw_if_index = match->pkt.sw_if_index;
+ u8 is_input = match->pkt.is_input;
+ applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] :
+ &am->output_hash_entry_vec_by_sw_if_index[sw_if_index];
+ applied_hash_acl_info_t **applied_hash_acls = is_input ? &am->input_applied_hash_acl_info_by_sw_if_index :
+ &am->output_applied_hash_acl_info_by_sw_if_index;
+
+ DBG("TRYING TO MATCH: %016llx %016llx %016llx %016llx %016llx %016llx",
+ pmatch[0], pmatch[1], pmatch[2], pmatch[3], pmatch[4], pmatch[5]);
+
+ for(mask_type_index=0; mask_type_index < pool_len(am->ace_mask_type_pool); mask_type_index++) {
+ if (!clib_bitmap_get((*applied_hash_acls)[sw_if_index].mask_type_index_bitmap, mask_type_index)) {
+ /* This bit is not set. Avoid trying to match */
+ continue;
+ }
+ ace_mask_type_entry_t *mte = &am->ace_mask_type_pool[mask_type_index];
+ pmatch = (u64 *)match;
+ pmask = (u64 *)&mte->mask;
+ pkey = (u64 *)kv.key;
+ /*
+ * unrolling the below loop results in a noticeable performance increase.
+ int i;
+ for(i=0; i<6; i++) {
+ kv.key[i] = pmatch[i] & pmask[i];
+ }
+ */
+
+ *pkey++ = *pmatch++ & *pmask++;
+ *pkey++ = *pmatch++ & *pmask++;
+ *pkey++ = *pmatch++ & *pmask++;
+ *pkey++ = *pmatch++ & *pmask++;
+ *pkey++ = *pmatch++ & *pmask++;
+ *pkey++ = *pmatch++ & *pmask++;
+
+ kv_key->pkt.mask_type_index_lsb = mask_type_index;
+ DBG(" KEY %3d: %016llx %016llx %016llx %016llx %016llx %016llx", mask_type_index,
+ kv.key[0], kv.key[1], kv.key[2], kv.key[3], kv.key[4], kv.key[5]);
+ int res = BV (clib_bihash_search) (&am->acl_lookup_hash, &kv, &result);
+ if (res == 0) {
+ DBG("ACL-MATCH! result_val: %016llx", result_val->as_u64);
+ if (result_val->applied_entry_index < curr_match_index) {
+ if (PREDICT_FALSE(result_val->need_portrange_check)) {
+ /*
+ * This is going to be slow, since we can have multiple superset
+ * entries for narrow-ish portranges, e.g.:
+ * 0..42 100..400, 230..60000,
+ * so we need to walk linearly and check if they match.
+ */
+
+ u32 curr_index = result_val->applied_entry_index;
+ while ((curr_index != ~0) && !match_portranges(am, match, curr_index)) {
+ /* while no match and there are more entries, walk... */
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[curr_index]);
+ DBG("entry %d did not portmatch, advancing to %d", curr_index, pae->next_applied_entry_index);
+ curr_index = pae->next_applied_entry_index;
+ }
+ if (curr_index < curr_match_index) {
+ DBG("The index %d is the new candidate in portrange matches.", curr_index);
+ curr_match_index = result_val->applied_entry_index;
+ if (!result_val->shadowed) {
+ /* new result is known to not be shadowed, so no point to look up further */
+ break;
+ }
+ } else {
+ DBG("Curr portmatch index %d is too big vs. current matched one %d", curr_index, curr_match_index);
+ }
+ } else {
+ /* The usual path is here. Found an entry in front of the current candiate - so it's a new one */
+ DBG("This match is the new candidate");
+ curr_match_index = result_val->applied_entry_index;
+ if (!result_val->shadowed) {
+ /* new result is known to not be shadowed, so no point to look up further */
+ break;
+ }
+ }
+ }
+ }
+ }
+ DBG("MATCH-RESULT: %d", curr_match_index);
+ return curr_match_index;
+}
+
+static void
+hashtable_add_del(acl_main_t *am, clib_bihash_kv_48_8_t *kv, int is_add)
+{
+ DBG("HASH ADD/DEL: %016llx %016llx %016llx %016llx %016llx %016llx add %d",
+ kv->key[0], kv->key[1], kv->key[2],
+ kv->key[3], kv->key[4], kv->key[5], is_add);
+ BV (clib_bihash_add_del) (&am->acl_lookup_hash, kv, is_add);
+}
+
+static void
+fill_applied_hash_ace_kv(acl_main_t *am,
+ applied_hash_ace_entry_t **applied_hash_aces,
+ u32 sw_if_index, u8 is_input,
+ u32 new_index, clib_bihash_kv_48_8_t *kv)
+{
+ fa_5tuple_t *kv_key = (fa_5tuple_t *)kv->key;
+ hash_acl_lookup_value_t *kv_val = (hash_acl_lookup_value_t *)&kv->value;
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[new_index]);
+ hash_acl_info_t *ha = &am->hash_acl_infos[pae->acl_index];
+
+ memcpy(kv_key, &ha->rules[pae->hash_ace_info_index].match, sizeof(*kv_key));
+ /* initialize the sw_if_index and direction */
+ kv_key->pkt.sw_if_index = sw_if_index;
+ kv_key->pkt.is_input = is_input;
+ kv_val->as_u64 = 0;
+ kv_val->applied_entry_index = new_index;
+ kv_val->need_portrange_check = ha->rules[pae->hash_ace_info_index].src_portrange_not_powerof2 ||
+ ha->rules[pae->hash_ace_info_index].dst_portrange_not_powerof2;
+ /* by default assume all values are shadowed -> check all mask types */
+ kv_val->shadowed = 1;
+}
+
+static void
+add_del_hashtable_entry(acl_main_t *am,
+ u32 sw_if_index, u8 is_input,
+ applied_hash_ace_entry_t **applied_hash_aces,
+ u32 index, int is_add)
+{
+ clib_bihash_kv_48_8_t kv;
+
+ fill_applied_hash_ace_kv(am, applied_hash_aces, sw_if_index, is_input, index, &kv);
+ hashtable_add_del(am, &kv, is_add);
+}
+
+
+
+static void
+activate_applied_ace_hash_entry(acl_main_t *am,
+ u32 sw_if_index, u8 is_input,
+ applied_hash_ace_entry_t **applied_hash_aces,
+ u32 new_index)
+{
+ clib_bihash_kv_48_8_t kv;
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[new_index]);
+
+ fill_applied_hash_ace_kv(am, applied_hash_aces, sw_if_index, is_input, new_index, &kv);
+
+ DBG("APPLY ADD KY: %016llx %016llx %016llx %016llx %016llx %016llx",
+ kv.key[0], kv.key[1], kv.key[2],
+ kv.key[3], kv.key[4], kv.key[5]);
+
+ clib_bihash_kv_48_8_t result;
+ hash_acl_lookup_value_t *result_val = (hash_acl_lookup_value_t *)&result.value;
+ int res = BV (clib_bihash_search) (&am->acl_lookup_hash, &kv, &result);
+ if (res == 0) {
+ /* There already exists an entry or more. Append at the end. */
+ u32 existing_index = result_val->applied_entry_index;
+ DBG("A key already exists, with applied entry index: %d", existing_index);
+ ASSERT(existing_index != ~0);
+ applied_hash_ace_entry_t *existing_pae = &((*applied_hash_aces)[existing_index]);
+ /* walk the list to the last element */
+ while (existing_pae->next_applied_entry_index != ~0) {
+ if (existing_index == existing_pae->next_applied_entry_index) {
+ DBG("existing and next index of entry %d are the same, abort", existing_index);
+ ASSERT(existing_index != existing_pae->next_applied_entry_index);
+ }
+ existing_index = existing_pae->next_applied_entry_index;
+ existing_pae = &((*applied_hash_aces)[existing_index]);
+ DBG("...advance to chained entry index: %d", existing_index);
+ }
+ /* link ourseves in */
+ existing_pae->next_applied_entry_index = new_index;
+ pae->prev_applied_entry_index = existing_index;
+ } else {
+ /* It's the very first entry */
+ hashtable_add_del(am, &kv, 1);
+ }
+}
+
+static void
+applied_hash_entries_analyze(acl_main_t *am, applied_hash_ace_entry_t **applied_hash_aces)
+{
+ /*
+ * Go over the rules and check which ones are shadowed and which aren't.
+ * Naive approach: try to match the match value from every ACE as if it
+ * was a live packet, and see if the resulting match happens earlier in the list.
+ * if it does not match or it is later in the ACL - then the entry is not shadowed.
+ *
+ * This approach fails, an example:
+ * deny tcp 2001:db8::/32 2001:db8::/32
+ * permit ip 2001:db8::1/128 2001:db8::2/128
+ */
+}
+
+void
+hash_acl_apply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index)
+{
+ int i;
+
+ DBG("HASH ACL apply: sw_if_index %d is_input %d acl %d", sw_if_index, is_input, acl_index);
+ u32 *acl_vec = is_input ? am->input_acl_vec_by_sw_if_index[sw_if_index] :
+ am->output_acl_vec_by_sw_if_index[sw_if_index];
+ if (is_input) {
+ vec_validate(am->input_hash_entry_vec_by_sw_if_index, sw_if_index);
+ } else {
+ vec_validate(am->output_hash_entry_vec_by_sw_if_index, sw_if_index);
+ }
+ vec_validate(am->hash_acl_infos, acl_index);
+ applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] :
+ &am->output_hash_entry_vec_by_sw_if_index[sw_if_index];
+ u32 order_index = vec_search(acl_vec, acl_index);
+ hash_acl_info_t *ha = &am->hash_acl_infos[acl_index];
+ ASSERT(order_index != ~0);
+
+ if (!am->acl_lookup_hash_initialized) {
+ BV (clib_bihash_init) (&am->acl_lookup_hash, "ACL plugin rule lookup bihash",
+ 65536, 2 << 25);
+ am->acl_lookup_hash_initialized = 1;
+ }
+ int base_offset = vec_len(*applied_hash_aces);
+
+ /* Update the bitmap of the mask types with which the lookup
+ needs to happen for the ACLs applied to this sw_if_index */
+ applied_hash_acl_info_t **applied_hash_acls = is_input ? &am->input_applied_hash_acl_info_by_sw_if_index :
+ &am->output_applied_hash_acl_info_by_sw_if_index;
+ vec_validate((*applied_hash_acls), sw_if_index);
+ applied_hash_acl_info_t *pal = &(*applied_hash_acls)[sw_if_index];
+ pal->mask_type_index_bitmap = clib_bitmap_or(pal->mask_type_index_bitmap,
+ ha->mask_type_index_bitmap);
+ /*
+ * if the applied ACL is empty, the current code will cause a
+ * different behavior compared to current linear search: an empty ACL will
+ * simply fallthrough to the next ACL, or the default deny in the end.
+ *
+ * This is not a problem, because after vpp-dev discussion,
+ * the consensus was it should not be possible to apply the non-existent
+ * ACL, so the change adding this code also takes care of that.
+ */
+
+ /* expand the applied aces vector by the necessary amount */
+ vec_resize((*applied_hash_aces), vec_len(ha->rules));
+
+ /* add the rules from the ACL to the hash table for lookup and append to the vector*/
+ for(i=0; i < vec_len(ha->rules); i++) {
+ u32 new_index = base_offset + i;
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[new_index]);
+ pae->acl_index = acl_index;
+ pae->ace_index = ha->rules[i].ace_index;
+ pae->action = ha->rules[i].action;
+ pae->hash_ace_info_index = i;
+ /* we might link it in later */
+ pae->next_applied_entry_index = ~0;
+ pae->prev_applied_entry_index = ~0;
+ activate_applied_ace_hash_entry(am, sw_if_index, is_input, applied_hash_aces, new_index);
+ }
+ applied_hash_entries_analyze(am, applied_hash_aces);
+}
+
+static void
+move_applied_ace_hash_entry(acl_main_t *am,
+ u32 sw_if_index, u8 is_input,
+ applied_hash_ace_entry_t **applied_hash_aces,
+ u32 old_index, u32 new_index)
+{
+
+ /* move the entry */
+ (*applied_hash_aces)[new_index] = (*applied_hash_aces)[old_index];
+
+ /* update the linkage and hash table if necessary */
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[old_index]);
+
+ if (pae->prev_applied_entry_index != ~0) {
+ applied_hash_ace_entry_t *prev_pae = &((*applied_hash_aces)[pae->prev_applied_entry_index]);
+ ASSERT(prev_pae->next_applied_entry_index == old_index);
+ prev_pae->next_applied_entry_index = new_index;
+ } else {
+ /* first entry - so the hash points to it, update */
+ add_del_hashtable_entry(am, sw_if_index, is_input,
+ applied_hash_aces, new_index, 1);
+ }
+ if (pae->next_applied_entry_index != ~0) {
+ applied_hash_ace_entry_t *next_pae = &((*applied_hash_aces)[pae->next_applied_entry_index]);
+ ASSERT(next_pae->prev_applied_entry_index == old_index);
+ next_pae->prev_applied_entry_index = new_index;
+ }
+ /* invalidate the old entry */
+ pae->prev_applied_entry_index = ~0;
+ pae->next_applied_entry_index = ~0;
+}
+
+static void
+deactivate_applied_ace_hash_entry(acl_main_t *am,
+ u32 sw_if_index, u8 is_input,
+ applied_hash_ace_entry_t **applied_hash_aces,
+ u32 old_index)
+{
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[old_index]);
+
+ if (pae->next_applied_entry_index != ~0) {
+ applied_hash_ace_entry_t *next_pae = &((*applied_hash_aces)[pae->next_applied_entry_index]);
+ ASSERT(next_pae->prev_applied_entry_index == old_index);
+ next_pae->prev_applied_entry_index = pae->prev_applied_entry_index;
+ }
+
+ if (pae->prev_applied_entry_index != ~0) {
+ applied_hash_ace_entry_t *prev_pae = &((*applied_hash_aces)[pae->prev_applied_entry_index]);
+ ASSERT(prev_pae->next_applied_entry_index == old_index);
+ prev_pae->next_applied_entry_index = pae->next_applied_entry_index;
+ } else {
+ /* It was the first entry. We need either to reset the hash entry or delete it */
+ if (pae->next_applied_entry_index != ~0) {
+ add_del_hashtable_entry(am, sw_if_index, is_input,
+ applied_hash_aces, pae->next_applied_entry_index, 1);
+ } else {
+ /* no next entry, so just delete the entry in the hash table */
+ add_del_hashtable_entry(am, sw_if_index, is_input,
+ applied_hash_aces, old_index, 0);
+ }
+ }
+}
+
+
+static void
+hash_acl_build_applied_lookup_bitmap(acl_main_t *am, u32 sw_if_index, u8 is_input)
+{
+ int i;
+ uword *new_lookup_bitmap = 0;
+ u32 **applied_acls = is_input ? &am->input_acl_vec_by_sw_if_index[sw_if_index] :
+ &am->output_acl_vec_by_sw_if_index[sw_if_index];
+ applied_hash_acl_info_t **applied_hash_acls = is_input ? &am->input_applied_hash_acl_info_by_sw_if_index :
+ &am->output_applied_hash_acl_info_by_sw_if_index;
+ applied_hash_acl_info_t *pal = &(*applied_hash_acls)[sw_if_index];
+ for(i=0; i < vec_len(*applied_acls); i++) {
+ u32 a_acl_index = (*applied_acls)[i];
+ hash_acl_info_t *ha = &am->hash_acl_infos[a_acl_index];
+ new_lookup_bitmap = clib_bitmap_or(new_lookup_bitmap,
+ ha->mask_type_index_bitmap);
+ }
+ uword *old_lookup_bitmap = pal->mask_type_index_bitmap;
+ pal->mask_type_index_bitmap = new_lookup_bitmap;
+ clib_bitmap_free(old_lookup_bitmap);
+}
+
+void
+hash_acl_unapply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index)
+{
+ int i;
+
+ DBG("HASH ACL unapply: sw_if_index %d is_input %d acl %d", sw_if_index, is_input, acl_index);
+ hash_acl_info_t *ha = &am->hash_acl_infos[acl_index];
+ applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] :
+ &am->output_hash_entry_vec_by_sw_if_index[sw_if_index];
+
+ for(i=0; i < vec_len((*applied_hash_aces)); i++) {
+ if ((*applied_hash_aces)[i].acl_index == acl_index) {
+ DBG("Found applied ACL#%d at applied index %d", acl_index, i);
+ break;
+ }
+ }
+ if (vec_len((*applied_hash_aces)) <= i) {
+ DBG("Did not find applied ACL#%d at sw_if_index %d", acl_index, sw_if_index);
+ /* we went all the way without finding any entries. Probably a list was empty. */
+ return;
+ }
+ int base_offset = i;
+ int tail_offset = base_offset + vec_len(ha->rules);
+ int tail_len = vec_len((*applied_hash_aces)) - tail_offset;
+ DBG("base_offset: %d, tail_offset: %d, tail_len: %d", base_offset, tail_offset, tail_len);
+
+ for(i=0; i < vec_len(ha->rules); i ++) {
+ DBG("UNAPPLY DEACTIVATE: sw_if_index %d is_input %d, applied index %d", sw_if_index, is_input, base_offset + i);
+ deactivate_applied_ace_hash_entry(am, sw_if_index, is_input,
+ applied_hash_aces, base_offset + i);
+ }
+ for(i=0; i < tail_len; i ++) {
+ /* move the entry at tail offset to base offset */
+ /* that is, from (tail_offset+i) -> (base_offset+i) */
+ DBG("UNAPPLY MOVE: sw_if_index %d is_input %d, applied index %d ->", sw_if_index, is_input, tail_offset+i, base_offset + i);
+ move_applied_ace_hash_entry(am, sw_if_index, is_input, applied_hash_aces, tail_offset + i, base_offset + i);
+ }
+ /* trim the end of the vector */
+ _vec_len((*applied_hash_aces)) -= vec_len(ha->rules);
+
+ applied_hash_entries_analyze(am, applied_hash_aces);
+
+ /* After deletion we might not need some of the mask-types anymore... */
+ hash_acl_build_applied_lookup_bitmap(am, sw_if_index, is_input);
+}
+
+/*
+ * Create the applied ACEs and update the hash table,
+ * taking into account that the ACL may not be the last
+ * in the vector of applied ACLs.
+ *
+ * For now, walk from the end of the vector and unapply the ACLs,
+ * then apply the one in question and reapply the rest.
+ */
+
+void
+hash_acl_reapply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index)
+{
+ u32 **applied_acls = is_input ? &am->input_acl_vec_by_sw_if_index[sw_if_index] :
+ &am->output_acl_vec_by_sw_if_index[sw_if_index];
+ int i;
+ int start_index = vec_search((*applied_acls), acl_index);
+ /*
+ * This function is called after we find out the sw_if_index where ACL is applied.
+ * If the by-sw_if_index vector does not have the ACL#, then it's a bug.
+ */
+ ASSERT(start_index < vec_len(*applied_acls));
+
+ /* unapply all the ACLs till the current one */
+ for(i = vec_len(*applied_acls) - 1; i >= start_index; i--) {
+ hash_acl_unapply(am, sw_if_index, is_input, (*applied_acls)[i]);
+ }
+ for(i = start_index; i < vec_len(*applied_acls); i++) {
+ hash_acl_apply(am, sw_if_index, is_input, (*applied_acls)[i]);
+ }
+}
+
+static void
+make_address_mask(ip46_address_t *addr, u8 is_ipv6, u8 prefix_len)
+{
+ if (is_ipv6) {
+ ip6_address_mask_from_width(&addr->ip6, prefix_len);
+ } else {
+ /* FIXME: this may not be correct way */
+ ip6_address_mask_from_width(&addr->ip6, prefix_len + 3*32);
+ ip46_address_mask_ip4(addr);
+ }
+}
+
+static u8
+make_port_mask(u16 *portmask, u16 port_first, u16 port_last)
+{
+ if (port_first == port_last) {
+ *portmask = 0xffff;
+ /* single port is representable by masked value */
+ return 0;
+ }
+ if ((port_first == 0) && (port_last == 65535)) {
+ *portmask = 0;
+ /* wildcard port is representable by a masked value */
+ return 0;
+ }
+
+ /*
+ * For now match all the ports, later
+ * here might be a better optimization which would
+ * pick out bitmaskable portranges.
+ *
+ * However, adding a new mask type potentially
+ * adds a per-packet extra lookup, so the benefit is not clear.
+ */
+ *portmask = 0;
+ /* This port range can't be represented via bitmask exactly. */
+ return 1;
+}
+
+static void
+make_mask_and_match_from_rule(fa_5tuple_t *mask, acl_rule_t *r, hash_ace_info_t *hi, int match_nonfirst_fragment)
+{
+ memset(mask, 0, sizeof(*mask));
+ memset(&hi->match, 0, sizeof(hi->match));
+ hi->action = r->is_permit;
+
+ /* we will need to be matching based on sw_if_index, direction, and mask_type_index when applied */
+ mask->pkt.sw_if_index = ~0;
+ mask->pkt.is_input = 1;
+ /* we will assign the match of mask_type_index later when we find it*/
+ mask->pkt.mask_type_index_lsb = ~0;
+
+ mask->pkt.is_ip6 = 1;
+ hi->match.pkt.is_ip6 = r->is_ipv6;
+
+ make_address_mask(&mask->addr[0], r->is_ipv6, r->src_prefixlen);
+ hi->match.addr[0] = r->src;
+ make_address_mask(&mask->addr[1], r->is_ipv6, r->dst_prefixlen);
+ hi->match.addr[1] = r->dst;
+
+ if (r->proto != 0) {
+ mask->l4.proto = ~0; /* L4 proto needs to be matched */
+ hi->match.l4.proto = r->proto;
+ if (match_nonfirst_fragment) {
+ /* match the non-first fragments only */
+ mask->pkt.is_nonfirst_fragment = 1;
+ hi->match.pkt.is_nonfirst_fragment = 1;
+ } else {
+ /* Calculate the src/dst port masks and make the src/dst port matches accordingly */
+ hi->src_portrange_not_powerof2 = make_port_mask(&mask->l4.port[0], r->src_port_or_type_first, r->src_port_or_type_last);
+ hi->match.l4.port[0] = r->src_port_or_type_first & mask->l4.port[0];
+ hi->dst_portrange_not_powerof2 = make_port_mask(&mask->l4.port[1], r->dst_port_or_code_first, r->dst_port_or_code_last);
+ hi->match.l4.port[1] = r->dst_port_or_code_first & mask->l4.port[1];
+ /* L4 info must be valid in order to match */
+ mask->pkt.l4_valid = 1;
+ hi->match.pkt.l4_valid = 1;
+ /* And we must set the mask to check that it is an initial fragment */
+ mask->pkt.is_nonfirst_fragment = 1;
+ hi->match.pkt.is_nonfirst_fragment = 0;
+ if ((r->proto == IPPROTO_TCP) && (r->tcp_flags_mask != 0)) {
+ /* if we want to match on TCP flags, they must be masked off as well */
+ mask->pkt.tcp_flags = r->tcp_flags_mask;
+ hi->match.pkt.tcp_flags = r->tcp_flags_value;
+ /* and the flags need to be present within the packet being matched */
+ mask->pkt.tcp_flags_valid = 1;
+ hi->match.pkt.tcp_flags_valid = 1;
+ }
+ }
+ }
+ /* Sanitize the mask and the match */
+ u64 *pmask = (u64 *)mask;
+ u64 *pmatch = (u64 *)&hi->match;
+ int j;
+ for(j=0; j<6; j++) {
+ pmatch[j] = pmatch[j] & pmask[j];
+ }
+}
+
+static u32
+find_mask_type_index(acl_main_t *am, fa_5tuple_t *mask)
+{
+ ace_mask_type_entry_t *mte;
+ /* *INDENT-OFF* */
+ pool_foreach(mte, am->ace_mask_type_pool,
+ ({
+ if(memcmp(&mte->mask, mask, sizeof(*mask)) == 0)
+ return (mte - am->ace_mask_type_pool);
+ }));
+ /* *INDENT-ON* */
+ return ~0;
+}
+
+static u32
+assign_mask_type_index(acl_main_t *am, fa_5tuple_t *mask)
+{
+ u32 mask_type_index = find_mask_type_index(am, mask);
+ ace_mask_type_entry_t *mte;
+ if(~0 == mask_type_index) {
+ pool_get_aligned (am->ace_mask_type_pool, mte, CLIB_CACHE_LINE_BYTES);
+ mask_type_index = mte - am->ace_mask_type_pool;
+ clib_memcpy(&mte->mask, mask, sizeof(mte->mask));
+ mte->refcount = 0;
+ /*
+ * We can use only 16 bits, since in the match there is only u16 field.
+ * Realistically, once you go to 64K of mask types, it is a huge
+ * problem anyway, so we might as well stop half way.
+ */
+ ASSERT(mask_type_index < 32768);
+ }
+ mte = am->ace_mask_type_pool + mask_type_index;
+ mte->refcount++;
+ return mask_type_index;
+}
+
+static void
+release_mask_type_index(acl_main_t *am, u32 mask_type_index)
+{
+ ace_mask_type_entry_t *mte = &am->ace_mask_type_pool[mask_type_index];
+ mte->refcount--;
+ if (mte->refcount == 0) {
+ /* we are not using this entry anymore */
+ pool_put(am->ace_mask_type_pool, mte);
+ }
+}
+
+void hash_acl_add(acl_main_t *am, int acl_index)
+{
+ DBG("HASH ACL add : %d", acl_index);
+ int i;
+ acl_list_t *a = &am->acls[acl_index];
+ vec_validate(am->hash_acl_infos, acl_index);
+ hash_acl_info_t *ha = &am->hash_acl_infos[acl_index];
+ memset(ha, 0, sizeof(*ha));
+
+ /* walk the newly added ACL entries and ensure that for each of them there
+ is a mask type, increment a reference count for that mask type */
+ for(i=0; i < a->count; i++) {
+ hash_ace_info_t ace_info;
+ fa_5tuple_t mask;
+ memset(&ace_info, 0, sizeof(ace_info));
+ ace_info.acl_index = acl_index;
+ ace_info.ace_index = i;
+
+ make_mask_and_match_from_rule(&mask, &a->rules[i], &ace_info, 0);
+ ace_info.mask_type_index = assign_mask_type_index(am, &mask);
+ /* assign the mask type index for matching itself */
+ ace_info.match.pkt.mask_type_index_lsb = ace_info.mask_type_index;
+ DBG("ACE: %d mask_type_index: %d", i, ace_info.mask_type_index);
+ /* Ensure a given index is set in the mask type index bitmap for this ACL */
+ ha->mask_type_index_bitmap = clib_bitmap_set(ha->mask_type_index_bitmap, ace_info.mask_type_index, 1);
+ vec_add1(ha->rules, ace_info);
+ if (am->l4_match_nonfirst_fragment) {
+ /* add the second rule which matches the noninitial fragments with the respective mask */
+ make_mask_and_match_from_rule(&mask, &a->rules[i], &ace_info, 1);
+ ace_info.mask_type_index = assign_mask_type_index(am, &mask);
+ ace_info.match.pkt.mask_type_index_lsb = ace_info.mask_type_index;
+ DBG("ACE: %d (non-initial frags) mask_type_index: %d", i, ace_info.mask_type_index);
+ /* Ensure a given index is set in the mask type index bitmap for this ACL */
+ ha->mask_type_index_bitmap = clib_bitmap_set(ha->mask_type_index_bitmap, ace_info.mask_type_index, 1);
+ vec_add1(ha->rules, ace_info);
+ }
+ }
+ /*
+ * if an ACL is applied somewhere, fill the corresponding lookup data structures.
+ * We need to take care if the ACL is not the last one in the vector of ACLs applied to the interface.
+ */
+ if (acl_index < vec_len(am->input_sw_if_index_vec_by_acl)) {
+ u32 *sw_if_index;
+ vec_foreach(sw_if_index, am->input_sw_if_index_vec_by_acl[acl_index]) {
+ hash_acl_reapply(am, *sw_if_index, 1, acl_index);
+ }
+ }
+ if (acl_index < vec_len(am->output_sw_if_index_vec_by_acl)) {
+ u32 *sw_if_index;
+ vec_foreach(sw_if_index, am->output_sw_if_index_vec_by_acl[acl_index]) {
+ hash_acl_reapply(am, *sw_if_index, 0, acl_index);
+ }
+ }
+}
+
+void hash_acl_delete(acl_main_t *am, int acl_index)
+{
+ DBG("HASH ACL delete : %d", acl_index);
+ /*
+ * If the ACL is applied somewhere, remove the references of it (call hash_acl_unapply)
+ * this is a different behavior from the linear lookup where an empty ACL is "deny all",
+ *
+ * However, following vpp-dev discussion the ACL that is referenced elsewhere
+ * should not be possible to delete, and the change adding this also adds
+ * the safeguards to that respect, so this is not a problem.
+ */
+ if (acl_index < vec_len(am->input_sw_if_index_vec_by_acl)) {
+ u32 *sw_if_index;
+ vec_foreach(sw_if_index, am->input_sw_if_index_vec_by_acl[acl_index]) {
+ hash_acl_unapply(am, *sw_if_index, 1, acl_index);
+ }
+ }
+ if (acl_index < vec_len(am->output_sw_if_index_vec_by_acl)) {
+ u32 *sw_if_index;
+ vec_foreach(sw_if_index, am->output_sw_if_index_vec_by_acl[acl_index]) {
+ hash_acl_unapply(am, *sw_if_index, 0, acl_index);
+ }
+ }
+
+ /* walk the mask types for the ACL about-to-be-deleted, and decrease
+ * the reference count, possibly freeing up some of them */
+ int i;
+ hash_acl_info_t *ha = &am->hash_acl_infos[acl_index];
+ for(i=0; i < vec_len(ha->rules); i++) {
+ release_mask_type_index(am, ha->rules[i].mask_type_index);
+ }
+ clib_bitmap_free(ha->mask_type_index_bitmap);
+ vec_free(ha->rules);
+}
+
+u8
+hash_multi_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2,
+ int is_ip6, int is_input, u32 * acl_match_p,
+ u32 * rule_match_p, u32 * trace_bitmap)
+{
+ acl_main_t *am = &acl_main;
+ applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] :
+ &am->output_hash_entry_vec_by_sw_if_index[sw_if_index];
+ u32 match_index = multi_acl_match_get_applied_ace_index(am, pkt_5tuple);
+ if (match_index < vec_len((*applied_hash_aces))) {
+ applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[match_index]);
+ *acl_match_p = pae->acl_index;
+ *rule_match_p = pae->ace_index;
+ return pae->action;
+ }
+ return 0;
+}
+
+
+void
+show_hash_acl_hash (vlib_main_t * vm, acl_main_t *am, u32 verbose)
+{
+ vlib_cli_output(vm, "\nACL lookup hash table:\n%U\n",
+ BV (format_bihash), &am->acl_lookup_hash, verbose);
+}