Martin Casado
34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
#ifndef FLOW_H
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#define FLOW_H 1
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#include <stdint.h>
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#include "util.h"
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struct buffer;
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/* Identification data for a flow.
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All fields are in network byte order.
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In decreasing order by size, so that flow structures can be hashed or
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compared bytewise. */
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struct flow {
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uint32_t nw_src; /* IP source address. */
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uint32_t nw_dst; /* IP destination address. */
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uint16_t in_port; /* Input switch port. */
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uint16_t dl_vlan; /* Input VLAN. */
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uint16_t dl_type; /* Ethernet frame type. */
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uint16_t tp_src; /* TCP/UDP source port. */
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uint16_t tp_dst; /* TCP/UDP destination port. */
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uint8_t dl_src[6]; /* Ethernet source address. */
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uint8_t dl_dst[6]; /* Ethernet destination address. */
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uint8_t nw_proto; /* IP protocol. */
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uint8_t reserved; /* One byte of padding. */
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};
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BUILD_ASSERT_DECL(sizeof (struct flow) == 32);
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void flow_extract(const struct buffer *, uint16_t in_port, struct flow *);
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void flow_print(FILE *, const struct flow *);
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int flow_compare(const struct flow *, const struct flow *);
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unsigned long int flow_hash(const struct flow *, uint32_t basis);
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#endif /* flow.h */
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