diff options
Diffstat (limited to 'include/net/flow.h')
| -rw-r--r-- | include/net/flow.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/include/net/flow.h b/include/net/flow.h new file mode 100644 index 0000000000..335bbc5217 --- /dev/null +++ b/include/net/flow.h @@ -0,0 +1,195 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * + * Generic internet FLOW. + * + */ + +#ifndef _NET_FLOW_H +#define _NET_FLOW_H + +#include <linux/in6.h> +#include <linux/atomic.h> +#include <linux/container_of.h> +#include <linux/uidgid.h> + +struct flow_keys; + +/* + * 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_tunnel { + __be64 tun_id; +}; + +struct flowi_common { + int flowic_oif; + int flowic_iif; + int flowic_l3mdev; + __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; + kuid_t flowic_uid; + __u32 flowic_multipath_hash; + struct flowi_tunnel flowic_tun_key; +}; + +union flowi_uli { + struct { + __be16 dport; + __be16 sport; + } ports; + + struct { + __u8 type; + __u8 code; + } icmpt; + + __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_l3mdev __fl_common.flowic_l3mdev +#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 +#define flowi4_tun_key __fl_common.flowic_tun_key +#define flowi4_uid __fl_common.flowic_uid +#define flowi4_multipath_hash __fl_common.flowic_multipath_hash + + /* (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_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, + kuid_t uid) +{ + fl4->flowi4_oif = oif; + fl4->flowi4_iif = LOOPBACK_IFINDEX; + fl4->flowi4_l3mdev = 0; + 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->flowi4_tun_key.tun_id = 0; + fl4->flowi4_uid = uid; + fl4->daddr = daddr; + fl4->saddr = saddr; + fl4->fl4_dport = dport; + fl4->fl4_sport = sport; + fl4->flowi4_multipath_hash = 0; +} + +/* Reset some input parameters after previous lookup */ +static inline void flowi4_update_output(struct flowi4 *fl4, int oif, + __be32 daddr, __be32 saddr) +{ + fl4->flowi4_oif = oif; + 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_l3mdev __fl_common.flowic_l3mdev +#define flowi6_mark __fl_common.flowic_mark +#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 +#define flowi6_tun_key __fl_common.flowic_tun_key +#define flowi6_uid __fl_common.flowic_uid + struct in6_addr daddr; + struct in6_addr saddr; + /* Note: flowi6_tos is encoded in flowlabel, too. */ + __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_mh_type uli.mht.type +#define fl6_gre_key uli.gre_key + __u32 mp_hash; +} __attribute__((__aligned__(BITS_PER_LONG/8))); + +struct flowi { + union { + struct flowi_common __fl_common; + struct flowi4 ip4; + struct flowi6 ip6; + } u; +#define flowi_oif u.__fl_common.flowic_oif +#define flowi_iif u.__fl_common.flowic_iif +#define flowi_l3mdev u.__fl_common.flowic_l3mdev +#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 +#define flowi_tun_key u.__fl_common.flowic_tun_key +#define flowi_uid u.__fl_common.flowic_uid +} __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_common *flowi4_to_flowi_common(struct flowi4 *fl4) +{ + return &(fl4->__fl_common); +} + +static inline struct flowi *flowi6_to_flowi(struct flowi6 *fl6) +{ + return container_of(fl6, struct flowi, u.ip6); +} + +static inline struct flowi_common *flowi6_to_flowi_common(struct flowi6 *fl6) +{ + return &(fl6->__fl_common); +} + +__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); + +#endif |