| /* Minimized/hacked up from openvswitch lib/conntrack.c, which had this license |
| header: */ |
| /* |
| * Copyright (c) 2015-2019 Nicira, Inc. |
| * |
| * 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. |
| */ |
| |
| typedef __SIZE_TYPE__ size_t; |
| #define NULL ((void *)0) |
| #define false 0 |
| |
| #define OBJECT_OFFSETOF(OBJECT, MEMBER)\ |
| __builtin_offsetof(typeof(*(OBJECT)), MEMBER) |
| |
| #define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \ |
| ((typeof(OBJECT)) (void *) \ |
| ((char *) (POINTER) - OBJECT_OFFSETOF(OBJECT, MEMBER))) |
| |
| #define ASSIGN_CONTAINER(OBJECT, POINTER, MEMBER) \ |
| ((OBJECT) = OBJECT_CONTAINING(POINTER, OBJECT, MEMBER), (void) 0) |
| |
| #define INIT_CONTAINER(OBJECT, POINTER, MEMBER) \ |
| ((OBJECT) = NULL, ASSIGN_CONTAINER(OBJECT, POINTER, MEMBER)) |
| |
| #define HMAP_FOR_EACH_POP(NODE, MEMBER, HMAP) \ |
| for (size_t bucket__ = 0; \ |
| INIT_CONTAINER(NODE, hmap_pop_helper__(HMAP, &bucket__), MEMBER), \ |
| (NODE != OBJECT_CONTAINING(NULL, NODE, MEMBER)) \ |
| || ((NODE = NULL), false);) |
| |
| struct hmap { |
| struct hmap_node **buckets; |
| struct hmap_node *one; |
| size_t mask; |
| size_t n; |
| }; |
| |
| struct hmap_node { |
| size_t hash; |
| struct hmap_node *next; |
| }; |
| |
| static inline void hmap_remove(struct hmap *, struct hmap_node *); |
| |
| struct hmap_node * |
| hmap_pop_helper__(struct hmap *hmap, size_t *bucket) { |
| |
| for (; *bucket <= hmap->mask; (*bucket)++) { |
| struct hmap_node *node = hmap->buckets[*bucket]; |
| |
| if (node) { |
| hmap_remove(hmap, node); |
| return node; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static inline void |
| hmap_remove(struct hmap *hmap, struct hmap_node *node) |
| { |
| struct hmap_node **bucket = &hmap->buckets[node->hash & hmap->mask]; |
| while (*bucket != node) { |
| bucket = &(*bucket)->next; |
| } |
| *bucket = node->next; |
| hmap->n--; |
| } |
| |
| struct conntrack { |
| struct hmap zone_limits; |
| }; |
| |
| struct zone_limit { |
| struct hmap_node node; |
| }; |
| |
| void |
| conntrack_destroy(struct conntrack *ct) |
| { |
| struct zone_limit *zl; |
| HMAP_FOR_EACH_POP (zl, node, &ct->zone_limits) { |
| __builtin_free(zl); |
| } |
| } |