forked from Minki/linux
fbff949e3b
Introduce dissector infrastructure which allows user to specify which parts of skb he wants to dissect. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
#ifndef _NET_FLOW_DISSECTOR_H
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#define _NET_FLOW_DISSECTOR_H
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/**
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* struct flow_dissector_key_basic:
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* @thoff: Transport header offset
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* @n_proto: Network header protocol (eg. IPv4/IPv6)
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* @ip_proto: Transport header protocol (eg. TCP/UDP)
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*/
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struct flow_dissector_key_basic {
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u16 thoff;
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__be16 n_proto;
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u8 ip_proto;
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};
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/**
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* struct flow_dissector_key_addrs:
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* @src: source ip address in case of IPv4
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* For IPv6 it contains 32bit hash of src address
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* @dst: destination ip address in case of IPv4
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* For IPv6 it contains 32bit hash of dst address
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*/
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struct flow_dissector_key_addrs {
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/* (src,dst) must be grouped, in the same way than in IP header */
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__be32 src;
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__be32 dst;
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};
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/**
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* flow_dissector_key_tp_ports:
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* @ports: port numbers of Transport header
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* port16[0]: src port number
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* port16[1]: dst port number
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*/
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struct flow_dissector_key_ports {
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union {
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__be32 ports;
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__be16 port16[2];
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};
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};
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enum flow_dissector_key_id {
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FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
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FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_addrs */
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FLOW_DISSECTOR_KEY_IPV6_HASH_ADDRS, /* struct flow_dissector_key_addrs */
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FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
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FLOW_DISSECTOR_KEY_MAX,
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};
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struct flow_dissector_key {
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enum flow_dissector_key_id key_id;
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size_t offset; /* offset of struct flow_dissector_key_*
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in target the struct */
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};
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struct flow_dissector {
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unsigned int used_keys; /* each bit repesents presence of one key id */
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unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];
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};
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/* struct flow_keys:
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* @src: source ip address in case of IPv4
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* For IPv6 it contains 32bit hash of src address
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* @dst: destination ip address in case of IPv4
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* For IPv6 it contains 32bit hash of dst address
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* @ports: port numbers of Transport header
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* port16[0]: src port number
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* port16[1]: dst port number
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* @thoff: Transport header offset
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* @n_proto: Network header protocol (eg. IPv4/IPv6)
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* @ip_proto: Transport header protocol (eg. TCP/UDP)
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* All the members, except thoff, are in network byte order.
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*/
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struct flow_keys {
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/* (src,dst) must be grouped, in the same way than in IP header */
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__be32 src;
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__be32 dst;
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union {
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__be32 ports;
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__be16 port16[2];
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};
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u16 thoff;
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__be16 n_proto;
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u8 ip_proto;
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};
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void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
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const struct flow_dissector_key *key,
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unsigned int key_count);
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bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow,
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void *data, __be16 proto, int nhoff, int hlen);
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static inline bool skb_flow_dissect(const struct sk_buff *skb,
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struct flow_keys *flow)
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{
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return __skb_flow_dissect(skb, flow, NULL, 0, 0, 0);
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}
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__be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto,
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void *data, int hlen_proto);
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static inline __be32 skb_flow_get_ports(const struct sk_buff *skb,
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int thoff, u8 ip_proto)
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{
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return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0);
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}
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u32 flow_hash_from_keys(struct flow_keys *keys);
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void __skb_get_hash(struct sk_buff *skb);
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u32 skb_get_poff(const struct sk_buff *skb);
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u32 __skb_get_poff(const struct sk_buff *skb, void *data,
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const struct flow_keys *keys, int hlen);
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/* struct flow_keys_digest:
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*
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* This structure is used to hold a digest of the full flow keys. This is a
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* larger "hash" of a flow to allow definitively matching specific flows where
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* the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so
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* that it can by used in CB of skb (see sch_choke for an example).
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*/
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#define FLOW_KEYS_DIGEST_LEN 16
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struct flow_keys_digest {
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u8 data[FLOW_KEYS_DIGEST_LEN];
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};
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void make_flow_keys_digest(struct flow_keys_digest *digest,
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const struct flow_keys *flow);
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#endif
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