diff options
Diffstat (limited to 'kernel/include/net/flow.h')
| -rw-r--r-- | kernel/include/net/flow.h | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/kernel/include/net/flow.h b/kernel/include/net/flow.h new file mode 100644 index 000000000..8109a159d --- /dev/null +++ b/kernel/include/net/flow.h @@ -0,0 +1,236 @@ +/* + * + * Generic internet FLOW. + * + */ + +#ifndef _NET_FLOW_H +#define _NET_FLOW_H + +#include <linux/socket.h> +#include <linux/in6.h> +#include <linux/atomic.h> + +/* + * ifindex generation is per-net namespace, and loopback is + * always the 1st device in ns (see net_dev_init), thus any + * loopback device should get ifindex 1 + */ + +#define LOOPBACK_IFINDEX 1 + +struct flowi_common { + int flowic_oif; + int flowic_iif; + __u32 flowic_mark; + __u8 flowic_tos; + __u8 flowic_scope; + __u8 flowic_proto; + __u8 flowic_flags; +#define FLOWI_FLAG_ANYSRC 0x01 +#define FLOWI_FLAG_KNOWN_NH 0x02 + __u32 flowic_secid; +}; + +union flowi_uli { + struct { + __be16 dport; + __be16 sport; + } ports; + + struct { + __u8 type; + __u8 code; + } icmpt; + + struct { + __le16 dport; + __le16 sport; + } dnports; + + __be32 spi; + __be32 gre_key; + + struct { + __u8 type; + } mht; +}; + +struct flowi4 { + struct flowi_common __fl_common; +#define flowi4_oif __fl_common.flowic_oif +#define flowi4_iif __fl_common.flowic_iif +#define flowi4_mark __fl_common.flowic_mark +#define flowi4_tos __fl_common.flowic_tos +#define flowi4_scope __fl_common.flowic_scope +#define flowi4_proto __fl_common.flowic_proto +#define flowi4_flags __fl_common.flowic_flags +#define flowi4_secid __fl_common.flowic_secid + + /* (saddr,daddr) must be grouped, same order as in IP header */ + __be32 saddr; + __be32 daddr; + + union flowi_uli uli; +#define fl4_sport uli.ports.sport +#define fl4_dport uli.ports.dport +#define fl4_icmp_type uli.icmpt.type +#define fl4_icmp_code uli.icmpt.code +#define fl4_ipsec_spi uli.spi +#define fl4_mh_type uli.mht.type +#define fl4_gre_key uli.gre_key +} __attribute__((__aligned__(BITS_PER_LONG/8))); + +static inline void flowi4_init_output(struct flowi4 *fl4, int oif, + __u32 mark, __u8 tos, __u8 scope, + __u8 proto, __u8 flags, + __be32 daddr, __be32 saddr, + __be16 dport, __be16 sport) +{ + fl4->flowi4_oif = oif; + fl4->flowi4_iif = LOOPBACK_IFINDEX; + fl4->flowi4_mark = mark; + fl4->flowi4_tos = tos; + fl4->flowi4_scope = scope; + fl4->flowi4_proto = proto; + fl4->flowi4_flags = flags; + fl4->flowi4_secid = 0; + fl4->daddr = daddr; + fl4->saddr = saddr; + fl4->fl4_dport = dport; + fl4->fl4_sport = sport; +} + +/* Reset some input parameters after previous lookup */ +static inline void flowi4_update_output(struct flowi4 *fl4, int oif, __u8 tos, + __be32 daddr, __be32 saddr) +{ + fl4->flowi4_oif = oif; + fl4->flowi4_tos = tos; + fl4->daddr = daddr; + fl4->saddr = saddr; +} + + +struct flowi6 { + struct flowi_common __fl_common; +#define flowi6_oif __fl_common.flowic_oif +#define flowi6_iif __fl_common.flowic_iif +#define flowi6_mark __fl_common.flowic_mark +#define flowi6_tos __fl_common.flowic_tos +#define flowi6_scope __fl_common.flowic_scope +#define flowi6_proto __fl_common.flowic_proto +#define flowi6_flags __fl_common.flowic_flags +#define flowi6_secid __fl_common.flowic_secid + struct in6_addr daddr; + struct in6_addr saddr; + __be32 flowlabel; + union flowi_uli uli; +#define fl6_sport uli.ports.sport +#define fl6_dport uli.ports.dport +#define fl6_icmp_type uli.icmpt.type +#define fl6_icmp_code uli.icmpt.code +#define fl6_ipsec_spi uli.spi +#define fl6_mh_type uli.mht.type +#define fl6_gre_key uli.gre_key +} __attribute__((__aligned__(BITS_PER_LONG/8))); + +struct flowidn { + struct flowi_common __fl_common; +#define flowidn_oif __fl_common.flowic_oif +#define flowidn_iif __fl_common.flowic_iif +#define flowidn_mark __fl_common.flowic_mark +#define flowidn_scope __fl_common.flowic_scope +#define flowidn_proto __fl_common.flowic_proto +#define flowidn_flags __fl_common.flowic_flags + __le16 daddr; + __le16 saddr; + union flowi_uli uli; +#define fld_sport uli.ports.sport +#define fld_dport uli.ports.dport +} __attribute__((__aligned__(BITS_PER_LONG/8))); + +struct flowi { + union { + struct flowi_common __fl_common; + struct flowi4 ip4; + struct flowi6 ip6; + struct flowidn dn; + } u; +#define flowi_oif u.__fl_common.flowic_oif +#define flowi_iif u.__fl_common.flowic_iif +#define flowi_mark u.__fl_common.flowic_mark +#define flowi_tos u.__fl_common.flowic_tos +#define flowi_scope u.__fl_common.flowic_scope +#define flowi_proto u.__fl_common.flowic_proto +#define flowi_flags u.__fl_common.flowic_flags +#define flowi_secid u.__fl_common.flowic_secid +} __attribute__((__aligned__(BITS_PER_LONG/8))); + +static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4) +{ + return container_of(fl4, struct flowi, u.ip4); +} + +static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) +{ + return container_of(fl6, struct flowi, u.ip6); +} + +static inline struct flowi *flowidn_to_flowi(struct flowidn *fldn) +{ + return container_of(fldn, struct flowi, u.dn); +} + +typedef unsigned long flow_compare_t; + +static inline size_t flow_key_size(u16 family) +{ + switch (family) { + case AF_INET: + BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t)); + return sizeof(struct flowi4) / sizeof(flow_compare_t); + case AF_INET6: + BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t)); + return sizeof(struct flowi6) / sizeof(flow_compare_t); + case AF_DECnet: + BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t)); + return sizeof(struct flowidn) / sizeof(flow_compare_t); + } + return 0; +} + +#define FLOW_DIR_IN 0 +#define FLOW_DIR_OUT 1 +#define FLOW_DIR_FWD 2 + +struct net; +struct sock; +struct flow_cache_ops; + +struct flow_cache_object { + const struct flow_cache_ops *ops; +}; + +struct flow_cache_ops { + struct flow_cache_object *(*get)(struct flow_cache_object *); + int (*check)(struct flow_cache_object *); + void (*delete)(struct flow_cache_object *); +}; + +typedef struct flow_cache_object *(*flow_resolve_t)( + struct net *net, const struct flowi *key, u16 family, + u8 dir, struct flow_cache_object *oldobj, void *ctx); + +struct flow_cache_object *flow_cache_lookup(struct net *net, + const struct flowi *key, u16 family, + u8 dir, flow_resolve_t resolver, + void *ctx); +int flow_cache_init(struct net *net); +void flow_cache_fini(struct net *net); + +void flow_cache_flush(struct net *net); +void flow_cache_flush_deferred(struct net *net); +extern atomic_t flow_cache_genid; + +#endif |