56193d1bce
This patch updates some of the flow_dissector api so that it can be used to parse the length of ethernet buffers stored in fragments. Most of the changes needed were to __skb_get_poff as it needed to be updated to support sending a linear buffer instead of a skb. I have split __skb_get_poff into two functions, the first is skb_get_poff and it retains the functionality of the original __skb_get_poff. The other function is __skb_get_poff which now works much like __skb_flow_dissect in relation to skb_flow_dissect in that it provides the same functionality but works with just a data buffer and hlen instead of needing an skb. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
#ifndef _NET_FLOW_KEYS_H
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#define _NET_FLOW_KEYS_H
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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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u16 n_proto;
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u8 ip_proto;
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};
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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, 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, 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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unsigned int flow_get_hlen(const unsigned char *data, unsigned int max_len,
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__be16 protocol);
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#endif
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