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/* SPDX-License-Identifier: GPL-2.0 */ /* * * Generic internet FLOW. * */ #ifndef _NET_FLOW_H #define _NET_FLOW_H #include <linux/socket.h> #include <linux/in6.h> #include <linux/atomic.h> #include <net/flow_dissector.h> #include <linux/uidgid.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_tunnel { __be64 tun_id; }; 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 #define FLOWI_FLAG_SKIP_NH_OIF 0x04 __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; 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 #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_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, kuid_t uid) { 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->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, __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_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_ipsec_spi uli.spi #define fl6_mh_type uli.mht.type #define fl6_gre_key uli.gre_key __u32 mp_hash; } __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 #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 *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 unsigned int 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; } __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); #endif
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