mirror of
https://github.com/openvswitch/ovs
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a26ef51703
The ability to match the IP addresses in ARP packets allows for fine-grained control of ARP processing. Some forthcoming changes to allow in-band control to operate over L3 requires this support if we don't want to allow overly broad rules regarding ARPs to always be white-listed. Unfortunately, OpenFlow does not support this sort of processing yet, so we must treat OpenFlow ARP rules as having wildcarded those L3 fields.
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
/*
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* Copyright (c) 2008, 2009 Nicira Networks.
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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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#ifndef FLOW_H
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#define FLOW_H 1
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#include <netinet/in.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include "openflow/openflow.h"
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#include "hash.h"
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#include "openflow/openflow.h"
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#include "openvswitch/datapath-protocol.h"
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#include "util.h"
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struct ds;
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struct ofp_match;
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struct ofpbuf;
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typedef struct odp_flow_key flow_t;
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int flow_extract(struct ofpbuf *, uint16_t in_port, flow_t *);
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void flow_extract_stats(const flow_t *flow, struct ofpbuf *packet,
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struct odp_flow_stats *stats);
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void flow_to_match(const flow_t *, uint32_t wildcards, struct ofp_match *);
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void flow_to_ovs_match(const flow_t *, uint32_t wildcards, struct ofp_match *);
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void flow_from_match(flow_t *, uint32_t *wildcards, const struct ofp_match *);
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char *flow_to_string(const flow_t *);
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void flow_format(struct ds *, const flow_t *);
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void flow_print(FILE *, const flow_t *);
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static inline int flow_compare(const flow_t *, const flow_t *);
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static inline bool flow_equal(const flow_t *, const flow_t *);
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static inline size_t flow_hash(const flow_t *, uint32_t basis);
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static inline int
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flow_compare(const flow_t *a, const flow_t *b)
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{
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return memcmp(a, b, sizeof *a);
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}
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static inline bool
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flow_equal(const flow_t *a, const flow_t *b)
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{
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return !flow_compare(a, b);
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}
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static inline size_t
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flow_hash(const flow_t *flow, uint32_t basis)
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{
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BUILD_ASSERT_DECL(!(sizeof *flow % sizeof(uint32_t)));
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return hash_words((const uint32_t *) flow,
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sizeof *flow / sizeof(uint32_t), basis);
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}
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/* Information on wildcards for a flow, as a supplement to flow_t. */
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struct flow_wildcards {
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uint32_t wildcards; /* enum ofp_flow_wildcards (in host order). */
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uint32_t nw_src_mask; /* 1-bit in each significant nw_src bit. */
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uint32_t nw_dst_mask; /* 1-bit in each significant nw_dst bit. */
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};
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/* Given the wildcard bit count in bits 'shift' through 'shift + 5' (inclusive)
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* of 'wildcards', returns a 32-bit bit mask with a 1 in each bit that must
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* match and a 0 in each bit that is wildcarded.
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*
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* The bits in 'wildcards' are in the format used in enum ofp_flow_wildcards: 0
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* is exact match, 1 ignores the LSB, 2 ignores the 2 least-significant bits,
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* ..., 32 and higher wildcard the entire field. This is the *opposite* of the
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* usual convention where e.g. /24 indicates that 8 bits (not 24 bits) are
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* wildcarded.
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*
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* 'wildcards' is in host byte order. The return value is in network byte
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* order. */
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static inline uint32_t
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flow_nw_bits_to_mask(uint32_t wildcards, int shift)
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{
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wildcards = (wildcards >> shift) & 0x3f;
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return wildcards < 32 ? htonl(~((1u << wildcards) - 1)) : 0;
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}
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static inline void
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flow_wildcards_init(struct flow_wildcards *wc, uint32_t wildcards)
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{
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wc->wildcards = wildcards & OFPFW_ALL;
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wc->nw_src_mask = flow_nw_bits_to_mask(wc->wildcards, OFPFW_NW_SRC_SHIFT);
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wc->nw_dst_mask = flow_nw_bits_to_mask(wc->wildcards, OFPFW_NW_DST_SHIFT);
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}
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#endif /* flow.h */
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