mirror of
https://github.com/torvalds/linux
synced 2024-09-19 10:39:01 +00:00
a4daad6b09
TCP is going to record metrics for the connection, so pre-COW the route metrics at route cache entry creation time. This avoids several atomic operations that have to occur if we COW the metrics after the entry reaches global visibility. Signed-off-by: David S. Miller <davem@davemloft.net>
122 lines
2.4 KiB
C
122 lines
2.4 KiB
C
/*
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*
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* Generic internet FLOW.
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*
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*/
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#ifndef _NET_FLOW_H
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#define _NET_FLOW_H
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#include <linux/in6.h>
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#include <asm/atomic.h>
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struct flowi {
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int oif;
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int iif;
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__u32 mark;
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union {
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struct {
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__be32 daddr;
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__be32 saddr;
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__u8 tos;
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__u8 scope;
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} ip4_u;
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struct {
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struct in6_addr daddr;
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struct in6_addr saddr;
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__be32 flowlabel;
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} ip6_u;
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struct {
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__le16 daddr;
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__le16 saddr;
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__u8 scope;
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} dn_u;
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} nl_u;
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#define fld_dst nl_u.dn_u.daddr
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#define fld_src nl_u.dn_u.saddr
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#define fld_scope nl_u.dn_u.scope
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#define fl6_dst nl_u.ip6_u.daddr
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#define fl6_src nl_u.ip6_u.saddr
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#define fl6_flowlabel nl_u.ip6_u.flowlabel
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#define fl4_dst nl_u.ip4_u.daddr
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#define fl4_src nl_u.ip4_u.saddr
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#define fl4_tos nl_u.ip4_u.tos
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#define fl4_scope nl_u.ip4_u.scope
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__u8 proto;
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__u8 flags;
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#define FLOWI_FLAG_ANYSRC 0x01
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#define FLOWI_FLAG_PRECOW_METRICS 0x02
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union {
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struct {
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__be16 sport;
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__be16 dport;
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} ports;
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struct {
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__u8 type;
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__u8 code;
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} icmpt;
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struct {
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__le16 sport;
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__le16 dport;
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} dnports;
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__be32 spi;
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__be32 gre_key;
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struct {
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__u8 type;
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} mht;
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} uli_u;
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#define fl_ip_sport uli_u.ports.sport
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#define fl_ip_dport uli_u.ports.dport
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#define fl_icmp_type uli_u.icmpt.type
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#define fl_icmp_code uli_u.icmpt.code
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#define fl_ipsec_spi uli_u.spi
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#define fl_mh_type uli_u.mht.type
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#define fl_gre_key uli_u.gre_key
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__u32 secid; /* used by xfrm; see secid.txt */
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} __attribute__((__aligned__(BITS_PER_LONG/8)));
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#define FLOW_DIR_IN 0
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#define FLOW_DIR_OUT 1
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#define FLOW_DIR_FWD 2
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struct net;
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struct sock;
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struct flow_cache_ops;
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struct flow_cache_object {
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const struct flow_cache_ops *ops;
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};
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struct flow_cache_ops {
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struct flow_cache_object *(*get)(struct flow_cache_object *);
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int (*check)(struct flow_cache_object *);
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void (*delete)(struct flow_cache_object *);
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};
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typedef struct flow_cache_object *(*flow_resolve_t)(
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struct net *net, struct flowi *key, u16 family,
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u8 dir, struct flow_cache_object *oldobj, void *ctx);
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extern struct flow_cache_object *flow_cache_lookup(
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struct net *net, struct flowi *key, u16 family,
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u8 dir, flow_resolve_t resolver, void *ctx);
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extern void flow_cache_flush(void);
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extern atomic_t flow_cache_genid;
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static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
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{
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return (fl1->proto == fl2->proto &&
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!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));
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}
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#endif
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