98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/* Minimized/hacked up from openvswitch lib/conntrack.c, which had this license
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header: */
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/*
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* Copyright (c) 2015-2019 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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typedef __SIZE_TYPE__ size_t;
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#define NULL ((void *)0)
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#define false 0
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#define OBJECT_OFFSETOF(OBJECT, MEMBER)\
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__builtin_offsetof(typeof(*(OBJECT)), MEMBER)
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#define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \
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((typeof(OBJECT)) (void *) \
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((char *) (POINTER) - OBJECT_OFFSETOF(OBJECT, MEMBER)))
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#define ASSIGN_CONTAINER(OBJECT, POINTER, MEMBER) \
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((OBJECT) = OBJECT_CONTAINING(POINTER, OBJECT, MEMBER), (void) 0)
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#define INIT_CONTAINER(OBJECT, POINTER, MEMBER) \
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((OBJECT) = NULL, ASSIGN_CONTAINER(OBJECT, POINTER, MEMBER))
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#define HMAP_FOR_EACH_POP(NODE, MEMBER, HMAP) \
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for (size_t bucket__ = 0; \
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INIT_CONTAINER(NODE, hmap_pop_helper__(HMAP, &bucket__), MEMBER), \
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(NODE != OBJECT_CONTAINING(NULL, NODE, MEMBER)) \
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|| ((NODE = NULL), false);)
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struct hmap {
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struct hmap_node **buckets;
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struct hmap_node *one;
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size_t mask;
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size_t n;
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};
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struct hmap_node {
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size_t hash;
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struct hmap_node *next;
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};
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static inline void hmap_remove(struct hmap *, struct hmap_node *);
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struct hmap_node *
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hmap_pop_helper__(struct hmap *hmap, size_t *bucket) {
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for (; *bucket <= hmap->mask; (*bucket)++) {
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struct hmap_node *node = hmap->buckets[*bucket];
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if (node) {
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hmap_remove(hmap, node);
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return node;
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}
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}
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return NULL;
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}
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static inline void
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hmap_remove(struct hmap *hmap, struct hmap_node *node)
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{
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struct hmap_node **bucket = &hmap->buckets[node->hash & hmap->mask];
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while (*bucket != node) {
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bucket = &(*bucket)->next;
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}
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*bucket = node->next;
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hmap->n--;
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}
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struct conntrack {
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struct hmap zone_limits;
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};
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struct zone_limit {
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struct hmap_node node;
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};
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void
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conntrack_destroy(struct conntrack *ct)
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{
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struct zone_limit *zl;
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HMAP_FOR_EACH_POP (zl, node, &ct->zone_limits) {
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__builtin_free(zl);
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}
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}
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