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Diffstat (limited to 'include/net/xfrm.h')
| -rw-r--r-- | include/net/xfrm.h | 2191 |
1 files changed, 2191 insertions, 0 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h new file mode 100644 index 000000000..363c7d510 --- /dev/null +++ b/include/net/xfrm.h @@ -0,0 +1,2191 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NET_XFRM_H +#define _NET_XFRM_H + +#include <linux/compiler.h> +#include <linux/xfrm.h> +#include <linux/spinlock.h> +#include <linux/list.h> +#include <linux/skbuff.h> +#include <linux/socket.h> +#include <linux/pfkeyv2.h> +#include <linux/ipsec.h> +#include <linux/in6.h> +#include <linux/mutex.h> +#include <linux/audit.h> +#include <linux/slab.h> +#include <linux/refcount.h> +#include <linux/sockptr.h> + +#include <net/sock.h> +#include <net/dst.h> +#include <net/ip.h> +#include <net/route.h> +#include <net/ipv6.h> +#include <net/ip6_fib.h> +#include <net/flow.h> +#include <net/gro_cells.h> + +#include <linux/interrupt.h> + +#ifdef CONFIG_XFRM_STATISTICS +#include <net/snmp.h> +#endif + +#define XFRM_PROTO_ESP 50 +#define XFRM_PROTO_AH 51 +#define XFRM_PROTO_COMP 108 +#define XFRM_PROTO_IPIP 4 +#define XFRM_PROTO_IPV6 41 +#define XFRM_PROTO_ROUTING IPPROTO_ROUTING +#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS + +#define XFRM_ALIGN4(len) (((len) + 3) & ~3) +#define XFRM_ALIGN8(len) (((len) + 7) & ~7) +#define MODULE_ALIAS_XFRM_MODE(family, encap) \ + MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap)) +#define MODULE_ALIAS_XFRM_TYPE(family, proto) \ + MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto)) +#define MODULE_ALIAS_XFRM_OFFLOAD_TYPE(family, proto) \ + MODULE_ALIAS("xfrm-offload-" __stringify(family) "-" __stringify(proto)) + +#ifdef CONFIG_XFRM_STATISTICS +#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field) +#else +#define XFRM_INC_STATS(net, field) ((void)(net)) +#endif + + +/* Organization of SPD aka "XFRM rules" + ------------------------------------ + + Basic objects: + - policy rule, struct xfrm_policy (=SPD entry) + - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle) + - instance of a transformer, struct xfrm_state (=SA) + - template to clone xfrm_state, struct xfrm_tmpl + + SPD is plain linear list of xfrm_policy rules, ordered by priority. + (To be compatible with existing pfkeyv2 implementations, + many rules with priority of 0x7fffffff are allowed to exist and + such rules are ordered in an unpredictable way, thanks to bsd folks.) + + Lookup is plain linear search until the first match with selector. + + If "action" is "block", then we prohibit the flow, otherwise: + if "xfrms_nr" is zero, the flow passes untransformed. Otherwise, + policy entry has list of up to XFRM_MAX_DEPTH transformations, + described by templates xfrm_tmpl. Each template is resolved + to a complete xfrm_state (see below) and we pack bundle of transformations + to a dst_entry returned to requestor. + + dst -. xfrm .-> xfrm_state #1 + |---. child .-> dst -. xfrm .-> xfrm_state #2 + |---. child .-> dst -. xfrm .-> xfrm_state #3 + |---. child .-> NULL + + Bundles are cached at xrfm_policy struct (field ->bundles). + + + Resolution of xrfm_tmpl + ----------------------- + Template contains: + 1. ->mode Mode: transport or tunnel + 2. ->id.proto Protocol: AH/ESP/IPCOMP + 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode. + Q: allow to resolve security gateway? + 4. ->id.spi If not zero, static SPI. + 5. ->saddr Local tunnel endpoint, ignored for transport mode. + 6. ->algos List of allowed algos. Plain bitmask now. + Q: ealgos, aalgos, calgos. What a mess... + 7. ->share Sharing mode. + Q: how to implement private sharing mode? To add struct sock* to + flow id? + + Having this template we search through SAD searching for entries + with appropriate mode/proto/algo, permitted by selector. + If no appropriate entry found, it is requested from key manager. + + PROBLEMS: + Q: How to find all the bundles referring to a physical path for + PMTU discovery? Seems, dst should contain list of all parents... + and enter to infinite locking hierarchy disaster. + No! It is easier, we will not search for them, let them find us. + We add genid to each dst plus pointer to genid of raw IP route, + pmtu disc will update pmtu on raw IP route and increase its genid. + dst_check() will see this for top level and trigger resyncing + metrics. Plus, it will be made via sk->sk_dst_cache. Solved. + */ + +struct xfrm_state_walk { + struct list_head all; + u8 state; + u8 dying; + u8 proto; + u32 seq; + struct xfrm_address_filter *filter; +}; + +enum { + XFRM_DEV_OFFLOAD_IN = 1, + XFRM_DEV_OFFLOAD_OUT, + XFRM_DEV_OFFLOAD_FWD, +}; + +enum { + XFRM_DEV_OFFLOAD_UNSPECIFIED, + XFRM_DEV_OFFLOAD_CRYPTO, + XFRM_DEV_OFFLOAD_PACKET, +}; + +enum { + XFRM_DEV_OFFLOAD_FLAG_ACQ = 1, +}; + +struct xfrm_dev_offload { + struct net_device *dev; + netdevice_tracker dev_tracker; + struct net_device *real_dev; + unsigned long offload_handle; + u8 dir : 2; + u8 type : 2; + u8 flags : 2; +}; + +struct xfrm_mode { + u8 encap; + u8 family; + u8 flags; +}; + +/* Flags for xfrm_mode. */ +enum { + XFRM_MODE_FLAG_TUNNEL = 1, +}; + +enum xfrm_replay_mode { + XFRM_REPLAY_MODE_LEGACY, + XFRM_REPLAY_MODE_BMP, + XFRM_REPLAY_MODE_ESN, +}; + +/* Full description of state of transformer. */ +struct xfrm_state { + possible_net_t xs_net; + union { + struct hlist_node gclist; + struct hlist_node bydst; + }; + struct hlist_node bysrc; + struct hlist_node byspi; + struct hlist_node byseq; + + refcount_t refcnt; + spinlock_t lock; + + struct xfrm_id id; + struct xfrm_selector sel; + struct xfrm_mark mark; + u32 if_id; + u32 tfcpad; + + u32 genid; + + /* Key manager bits */ + struct xfrm_state_walk km; + + /* Parameters of this state. */ + struct { + u32 reqid; + u8 mode; + u8 replay_window; + u8 aalgo, ealgo, calgo; + u8 flags; + u16 family; + xfrm_address_t saddr; + int header_len; + int trailer_len; + u32 extra_flags; + struct xfrm_mark smark; + } props; + + struct xfrm_lifetime_cfg lft; + + /* Data for transformer */ + struct xfrm_algo_auth *aalg; + struct xfrm_algo *ealg; + struct xfrm_algo *calg; + struct xfrm_algo_aead *aead; + const char *geniv; + + /* mapping change rate limiting */ + __be16 new_mapping_sport; + u32 new_mapping; /* seconds */ + u32 mapping_maxage; /* seconds for input SA */ + + /* Data for encapsulator */ + struct xfrm_encap_tmpl *encap; + struct sock __rcu *encap_sk; + + /* Data for care-of address */ + xfrm_address_t *coaddr; + + /* IPComp needs an IPIP tunnel for handling uncompressed packets */ + struct xfrm_state *tunnel; + + /* If a tunnel, number of users + 1 */ + atomic_t tunnel_users; + + /* State for replay detection */ + struct xfrm_replay_state replay; + struct xfrm_replay_state_esn *replay_esn; + + /* Replay detection state at the time we sent the last notification */ + struct xfrm_replay_state preplay; + struct xfrm_replay_state_esn *preplay_esn; + + /* replay detection mode */ + enum xfrm_replay_mode repl_mode; + /* internal flag that only holds state for delayed aevent at the + * moment + */ + u32 xflags; + + /* Replay detection notification settings */ + u32 replay_maxage; + u32 replay_maxdiff; + + /* Replay detection notification timer */ + struct timer_list rtimer; + + /* Statistics */ + struct xfrm_stats stats; + + struct xfrm_lifetime_cur curlft; + struct hrtimer mtimer; + + struct xfrm_dev_offload xso; + + /* used to fix curlft->add_time when changing date */ + long saved_tmo; + + /* Last used time */ + time64_t lastused; + + struct page_frag xfrag; + + /* Reference to data common to all the instances of this + * transformer. */ + const struct xfrm_type *type; + struct xfrm_mode inner_mode; + struct xfrm_mode inner_mode_iaf; + struct xfrm_mode outer_mode; + + const struct xfrm_type_offload *type_offload; + + /* Security context */ + struct xfrm_sec_ctx *security; + + /* Private data of this transformer, format is opaque, + * interpreted by xfrm_type methods. */ + void *data; +}; + +static inline struct net *xs_net(struct xfrm_state *x) +{ + return read_pnet(&x->xs_net); +} + +/* xflags - make enum if more show up */ +#define XFRM_TIME_DEFER 1 +#define XFRM_SOFT_EXPIRE 2 + +enum { + XFRM_STATE_VOID, + XFRM_STATE_ACQ, + XFRM_STATE_VALID, + XFRM_STATE_ERROR, + XFRM_STATE_EXPIRED, + XFRM_STATE_DEAD +}; + +/* callback structure passed from either netlink or pfkey */ +struct km_event { + union { + u32 hard; + u32 proto; + u32 byid; + u32 aevent; + u32 type; + } data; + + u32 seq; + u32 portid; + u32 event; + struct net *net; +}; + +struct xfrm_if_decode_session_result { + struct net *net; + u32 if_id; +}; + +struct xfrm_if_cb { + bool (*decode_session)(struct sk_buff *skb, + unsigned short family, + struct xfrm_if_decode_session_result *res); +}; + +void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb); +void xfrm_if_unregister_cb(void); + +struct net_device; +struct xfrm_type; +struct xfrm_dst; +struct xfrm_policy_afinfo { + struct dst_ops *dst_ops; + struct dst_entry *(*dst_lookup)(struct net *net, + int tos, int oif, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr, + u32 mark); + int (*get_saddr)(struct net *net, int oif, + xfrm_address_t *saddr, + xfrm_address_t *daddr, + u32 mark); + int (*fill_dst)(struct xfrm_dst *xdst, + struct net_device *dev, + const struct flowi *fl); + struct dst_entry *(*blackhole_route)(struct net *net, struct dst_entry *orig); +}; + +int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family); +void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo); +void km_policy_notify(struct xfrm_policy *xp, int dir, + const struct km_event *c); +void km_state_notify(struct xfrm_state *x, const struct km_event *c); + +struct xfrm_tmpl; +int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, + struct xfrm_policy *pol); +void km_state_expired(struct xfrm_state *x, int hard, u32 portid); +int __xfrm_state_delete(struct xfrm_state *x); + +struct xfrm_state_afinfo { + u8 family; + u8 proto; + + const struct xfrm_type_offload *type_offload_esp; + + const struct xfrm_type *type_esp; + const struct xfrm_type *type_ipip; + const struct xfrm_type *type_ipip6; + const struct xfrm_type *type_comp; + const struct xfrm_type *type_ah; + const struct xfrm_type *type_routing; + const struct xfrm_type *type_dstopts; + + int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb); + int (*transport_finish)(struct sk_buff *skb, + int async); + void (*local_error)(struct sk_buff *skb, u32 mtu); +}; + +int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); +int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo); +struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); +struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family); + +struct xfrm_input_afinfo { + u8 family; + bool is_ipip; + int (*callback)(struct sk_buff *skb, u8 protocol, + int err); +}; + +int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo); +int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo); + +void xfrm_flush_gc(void); +void xfrm_state_delete_tunnel(struct xfrm_state *x); + +struct xfrm_type { + struct module *owner; + u8 proto; + u8 flags; +#define XFRM_TYPE_NON_FRAGMENT 1 +#define XFRM_TYPE_REPLAY_PROT 2 +#define XFRM_TYPE_LOCAL_COADDR 4 +#define XFRM_TYPE_REMOTE_COADDR 8 + + int (*init_state)(struct xfrm_state *x, + struct netlink_ext_ack *extack); + void (*destructor)(struct xfrm_state *); + int (*input)(struct xfrm_state *, struct sk_buff *skb); + int (*output)(struct xfrm_state *, struct sk_buff *pskb); + int (*reject)(struct xfrm_state *, struct sk_buff *, + const struct flowi *); +}; + +int xfrm_register_type(const struct xfrm_type *type, unsigned short family); +void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family); + +struct xfrm_type_offload { + struct module *owner; + u8 proto; + void (*encap)(struct xfrm_state *, struct sk_buff *pskb); + int (*input_tail)(struct xfrm_state *x, struct sk_buff *skb); + int (*xmit)(struct xfrm_state *, struct sk_buff *pskb, netdev_features_t features); +}; + +int xfrm_register_type_offload(const struct xfrm_type_offload *type, unsigned short family); +void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, unsigned short family); + +static inline int xfrm_af2proto(unsigned int family) +{ + switch(family) { + case AF_INET: + return IPPROTO_IPIP; + case AF_INET6: + return IPPROTO_IPV6; + default: + return 0; + } +} + +static inline const struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto) +{ + if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) || + (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6)) + return &x->inner_mode; + else + return &x->inner_mode_iaf; +} + +struct xfrm_tmpl { +/* id in template is interpreted as: + * daddr - destination of tunnel, may be zero for transport mode. + * spi - zero to acquire spi. Not zero if spi is static, then + * daddr must be fixed too. + * proto - AH/ESP/IPCOMP + */ + struct xfrm_id id; + +/* Source address of tunnel. Ignored, if it is not a tunnel. */ + xfrm_address_t saddr; + + unsigned short encap_family; + + u32 reqid; + +/* Mode: transport, tunnel etc. */ + u8 mode; + +/* Sharing mode: unique, this session only, this user only etc. */ + u8 share; + +/* May skip this transfomration if no SA is found */ + u8 optional; + +/* Skip aalgos/ealgos/calgos checks. */ + u8 allalgs; + +/* Bit mask of algos allowed for acquisition */ + u32 aalgos; + u32 ealgos; + u32 calgos; +}; + +#define XFRM_MAX_DEPTH 6 +#define XFRM_MAX_OFFLOAD_DEPTH 1 + +struct xfrm_policy_walk_entry { + struct list_head all; + u8 dead; +}; + +struct xfrm_policy_walk { + struct xfrm_policy_walk_entry walk; + u8 type; + u32 seq; +}; + +struct xfrm_policy_queue { + struct sk_buff_head hold_queue; + struct timer_list hold_timer; + unsigned long timeout; +}; + +struct xfrm_policy { + possible_net_t xp_net; + struct hlist_node bydst; + struct hlist_node byidx; + + /* This lock only affects elements except for entry. */ + rwlock_t lock; + refcount_t refcnt; + u32 pos; + struct timer_list timer; + + atomic_t genid; + u32 priority; + u32 index; + u32 if_id; + struct xfrm_mark mark; + struct xfrm_selector selector; + struct xfrm_lifetime_cfg lft; + struct xfrm_lifetime_cur curlft; + struct xfrm_policy_walk_entry walk; + struct xfrm_policy_queue polq; + bool bydst_reinsert; + u8 type; + u8 action; + u8 flags; + u8 xfrm_nr; + u16 family; + struct xfrm_sec_ctx *security; + struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; + struct hlist_node bydst_inexact_list; + struct rcu_head rcu; + + struct xfrm_dev_offload xdo; +}; + +static inline struct net *xp_net(const struct xfrm_policy *xp) +{ + return read_pnet(&xp->xp_net); +} + +struct xfrm_kmaddress { + xfrm_address_t local; + xfrm_address_t remote; + u32 reserved; + u16 family; +}; + +struct xfrm_migrate { + xfrm_address_t old_daddr; + xfrm_address_t old_saddr; + xfrm_address_t new_daddr; + xfrm_address_t new_saddr; + u8 proto; + u8 mode; + u16 reserved; + u32 reqid; + u16 old_family; + u16 new_family; +}; + +#define XFRM_KM_TIMEOUT 30 +/* what happened */ +#define XFRM_REPLAY_UPDATE XFRM_AE_CR +#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE + +/* default aevent timeout in units of 100ms */ +#define XFRM_AE_ETIME 10 +/* Async Event timer multiplier */ +#define XFRM_AE_ETH_M 10 +/* default seq threshold size */ +#define XFRM_AE_SEQT_SIZE 2 + +struct xfrm_mgr { + struct list_head list; + int (*notify)(struct xfrm_state *x, const struct km_event *c); + int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp); + struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir); + int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); + int (*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c); + int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr); + int (*migrate)(const struct xfrm_selector *sel, + u8 dir, u8 type, + const struct xfrm_migrate *m, + int num_bundles, + const struct xfrm_kmaddress *k, + const struct xfrm_encap_tmpl *encap); + bool (*is_alive)(const struct km_event *c); +}; + +void xfrm_register_km(struct xfrm_mgr *km); +void xfrm_unregister_km(struct xfrm_mgr *km); + +struct xfrm_tunnel_skb_cb { + union { + struct inet_skb_parm h4; + struct inet6_skb_parm h6; + } header; + + union { + struct ip_tunnel *ip4; + struct ip6_tnl *ip6; + } tunnel; +}; + +#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0])) + +/* + * This structure is used for the duration where packets are being + * transformed by IPsec. As soon as the packet leaves IPsec the + * area beyond the generic IP part may be overwritten. + */ +struct xfrm_skb_cb { + struct xfrm_tunnel_skb_cb header; + + /* Sequence number for replay protection. */ + union { + struct { + __u32 low; + __u32 hi; + } output; + struct { + __be32 low; + __be32 hi; + } input; + } seq; +}; + +#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0])) + +/* + * This structure is used by the afinfo prepare_input/prepare_output functions + * to transmit header information to the mode input/output functions. + */ +struct xfrm_mode_skb_cb { + struct xfrm_tunnel_skb_cb header; + + /* Copied from header for IPv4, always set to zero and DF for IPv6. */ + __be16 id; + __be16 frag_off; + + /* IP header length (excluding options or extension headers). */ + u8 ihl; + + /* TOS for IPv4, class for IPv6. */ + u8 tos; + + /* TTL for IPv4, hop limitfor IPv6. */ + u8 ttl; + + /* Protocol for IPv4, NH for IPv6. */ + u8 protocol; + + /* Option length for IPv4, zero for IPv6. */ + u8 optlen; + + /* Used by IPv6 only, zero for IPv4. */ + u8 flow_lbl[3]; +}; + +#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0])) + +/* + * This structure is used by the input processing to locate the SPI and + * related information. + */ +struct xfrm_spi_skb_cb { + struct xfrm_tunnel_skb_cb header; + + unsigned int daddroff; + unsigned int family; + __be32 seq; +}; + +#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0])) + +#ifdef CONFIG_AUDITSYSCALL +static inline struct audit_buffer *xfrm_audit_start(const char *op) +{ + struct audit_buffer *audit_buf = NULL; + + if (audit_enabled == AUDIT_OFF) + return NULL; + audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, + AUDIT_MAC_IPSEC_EVENT); + if (audit_buf == NULL) + return NULL; + audit_log_format(audit_buf, "op=%s", op); + return audit_buf; +} + +static inline void xfrm_audit_helper_usrinfo(bool task_valid, + struct audit_buffer *audit_buf) +{ + const unsigned int auid = from_kuid(&init_user_ns, task_valid ? + audit_get_loginuid(current) : + INVALID_UID); + const unsigned int ses = task_valid ? audit_get_sessionid(current) : + AUDIT_SID_UNSET; + + audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses); + audit_log_task_context(audit_buf); +} + +void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid); +void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, + bool task_valid); +void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid); +void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid); +void xfrm_audit_state_replay_overflow(struct xfrm_state *x, + struct sk_buff *skb); +void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb, + __be32 net_seq); +void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family); +void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi, + __be32 net_seq); +void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb, + u8 proto); +#else + +static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, + bool task_valid) +{ +} + +static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, + bool task_valid) +{ +} + +static inline void xfrm_audit_state_add(struct xfrm_state *x, int result, + bool task_valid) +{ +} + +static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result, + bool task_valid) +{ +} + +static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x, + struct sk_buff *skb) +{ +} + +static inline void xfrm_audit_state_replay(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ +} + +static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb, + u16 family) +{ +} + +static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, + __be32 net_spi, __be32 net_seq) +{ +} + +static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, + struct sk_buff *skb, u8 proto) +{ +} +#endif /* CONFIG_AUDITSYSCALL */ + +static inline void xfrm_pol_hold(struct xfrm_policy *policy) +{ + if (likely(policy != NULL)) + refcount_inc(&policy->refcnt); +} + +void xfrm_policy_destroy(struct xfrm_policy *policy); + +static inline void xfrm_pol_put(struct xfrm_policy *policy) +{ + if (refcount_dec_and_test(&policy->refcnt)) + xfrm_policy_destroy(policy); +} + +static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols) +{ + int i; + for (i = npols - 1; i >= 0; --i) + xfrm_pol_put(pols[i]); +} + +void __xfrm_state_destroy(struct xfrm_state *, bool); + +static inline void __xfrm_state_put(struct xfrm_state *x) +{ + refcount_dec(&x->refcnt); +} + +static inline void xfrm_state_put(struct xfrm_state *x) +{ + if (refcount_dec_and_test(&x->refcnt)) + __xfrm_state_destroy(x, false); +} + +static inline void xfrm_state_put_sync(struct xfrm_state *x) +{ + if (refcount_dec_and_test(&x->refcnt)) + __xfrm_state_destroy(x, true); +} + +static inline void xfrm_state_hold(struct xfrm_state *x) +{ + refcount_inc(&x->refcnt); +} + +static inline bool addr_match(const void *token1, const void *token2, + unsigned int prefixlen) +{ + const __be32 *a1 = token1; + const __be32 *a2 = token2; + unsigned int pdw; + unsigned int pbi; + + pdw = prefixlen >> 5; /* num of whole u32 in prefix */ + pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ + + if (pdw) + if (memcmp(a1, a2, pdw << 2)) + return false; + + if (pbi) { + __be32 mask; + + mask = htonl((0xffffffff) << (32 - pbi)); + + if ((a1[pdw] ^ a2[pdw]) & mask) + return false; + } + + return true; +} + +static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) +{ + /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ + if (sizeof(long) == 4 && prefixlen == 0) + return true; + return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); +} + +static __inline__ +__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli) +{ + __be16 port; + switch(fl->flowi_proto) { + case IPPROTO_TCP: + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + case IPPROTO_SCTP: + port = uli->ports.sport; + break; + case IPPROTO_ICMP: + case IPPROTO_ICMPV6: + port = htons(uli->icmpt.type); + break; + case IPPROTO_MH: + port = htons(uli->mht.type); + break; + case IPPROTO_GRE: + port = htons(ntohl(uli->gre_key) >> 16); + break; + default: + port = 0; /*XXX*/ + } + return port; +} + +static __inline__ +__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli) +{ + __be16 port; + switch(fl->flowi_proto) { + case IPPROTO_TCP: + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + case IPPROTO_SCTP: + port = uli->ports.dport; + break; + case IPPROTO_ICMP: + case IPPROTO_ICMPV6: + port = htons(uli->icmpt.code); + break; + case IPPROTO_GRE: + port = htons(ntohl(uli->gre_key) & 0xffff); + break; + default: + port = 0; /*XXX*/ + } + return port; +} + +bool xfrm_selector_match(const struct xfrm_selector *sel, + const struct flowi *fl, unsigned short family); + +#ifdef CONFIG_SECURITY_NETWORK_XFRM +/* If neither has a context --> match + * Otherwise, both must have a context and the sids, doi, alg must match + */ +static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) +{ + return ((!s1 && !s2) || + (s1 && s2 && + (s1->ctx_sid == s2->ctx_sid) && + (s1->ctx_doi == s2->ctx_doi) && + (s1->ctx_alg == s2->ctx_alg))); +} +#else +static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2) +{ + return true; +} +#endif + +/* A struct encoding bundle of transformations to apply to some set of flow. + * + * xdst->child points to the next element of bundle. + * dst->xfrm points to an instanse of transformer. + * + * Due to unfortunate limitations of current routing cache, which we + * have no time to fix, it mirrors struct rtable and bound to the same + * routing key, including saddr,daddr. However, we can have many of + * bundles differing by session id. All the bundles grow from a parent + * policy rule. + */ +struct xfrm_dst { + union { + struct dst_entry dst; + struct rtable rt; + struct rt6_info rt6; + } u; + struct dst_entry *route; + struct dst_entry *child; + struct dst_entry *path; + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + int num_pols, num_xfrms; + u32 xfrm_genid; + u32 policy_genid; + u32 route_mtu_cached; + u32 child_mtu_cached; + u32 route_cookie; + u32 path_cookie; +}; + +static inline struct dst_entry *xfrm_dst_path(const struct dst_entry *dst) +{ +#ifdef CONFIG_XFRM + if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { + const struct xfrm_dst *xdst = (const struct xfrm_dst *) dst; + + return xdst->path; + } +#endif + return (struct dst_entry *) dst; +} + +static inline struct dst_entry *xfrm_dst_child(const struct dst_entry *dst) +{ +#ifdef CONFIG_XFRM + if (dst->xfrm || (dst->flags & DST_XFRM_QUEUE)) { + struct xfrm_dst *xdst = (struct xfrm_dst *) dst; + return xdst->child; + } +#endif + return NULL; +} + +#ifdef CONFIG_XFRM +static inline void xfrm_dst_set_child(struct xfrm_dst *xdst, struct dst_entry *child) +{ + xdst->child = child; +} + +static inline void xfrm_dst_destroy(struct xfrm_dst *xdst) +{ + xfrm_pols_put(xdst->pols, xdst->num_pols); + dst_release(xdst->route); + if (likely(xdst->u.dst.xfrm)) + xfrm_state_put(xdst->u.dst.xfrm); +} +#endif + +void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev); + +struct xfrm_if_parms { + int link; /* ifindex of underlying L2 interface */ + u32 if_id; /* interface identifyer */ + bool collect_md; +}; + +struct xfrm_if { + struct xfrm_if __rcu *next; /* next interface in list */ + struct net_device *dev; /* virtual device associated with interface */ + struct net *net; /* netns for packet i/o */ + struct xfrm_if_parms p; /* interface parms */ + + struct gro_cells gro_cells; +}; + +struct xfrm_offload { + /* Output sequence number for replay protection on offloading. */ + struct { + __u32 low; + __u32 hi; + } seq; + + __u32 flags; +#define SA_DELETE_REQ 1 +#define CRYPTO_DONE 2 +#define CRYPTO_NEXT_DONE 4 +#define CRYPTO_FALLBACK 8 +#define XFRM_GSO_SEGMENT 16 +#define XFRM_GRO 32 +/* 64 is free */ +#define XFRM_DEV_RESUME 128 +#define XFRM_XMIT 256 + + __u32 status; +#define CRYPTO_SUCCESS 1 +#define CRYPTO_GENERIC_ERROR 2 +#define CRYPTO_TRANSPORT_AH_AUTH_FAILED 4 +#define CRYPTO_TRANSPORT_ESP_AUTH_FAILED 8 +#define CRYPTO_TUNNEL_AH_AUTH_FAILED 16 +#define CRYPTO_TUNNEL_ESP_AUTH_FAILED 32 +#define CRYPTO_INVALID_PACKET_SYNTAX 64 +#define CRYPTO_INVALID_PROTOCOL 128 + + __u8 proto; + __u8 inner_ipproto; +}; + +struct sec_path { + int len; + int olen; + int verified_cnt; + + struct xfrm_state *xvec[XFRM_MAX_DEPTH]; + struct xfrm_offload ovec[XFRM_MAX_OFFLOAD_DEPTH]; +}; + +struct sec_path *secpath_set(struct sk_buff *skb); + +static inline void +secpath_reset(struct sk_buff *skb) +{ +#ifdef CONFIG_XFRM + skb_ext_del(skb, SKB_EXT_SEC_PATH); +#endif +} + +static inline int +xfrm_addr_any(const xfrm_address_t *addr, unsigned short family) +{ + switch (family) { + case AF_INET: + return addr->a4 == 0; + case AF_INET6: + return ipv6_addr_any(&addr->in6); + } + return 0; +} + +static inline int +__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) +{ + return (tmpl->saddr.a4 && + tmpl->saddr.a4 != x->props.saddr.a4); +} + +static inline int +__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x) +{ + return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) && + !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr)); +} + +static inline int +xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family) +{ + switch (family) { + case AF_INET: + return __xfrm4_state_addr_cmp(tmpl, x); + case AF_INET6: + return __xfrm6_state_addr_cmp(tmpl, x); + } + return !0; +} + +#ifdef CONFIG_XFRM +static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb) +{ + struct sec_path *sp = skb_sec_path(skb); + + return sp->xvec[sp->len - 1]; +} +#endif + +static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) +{ +#ifdef CONFIG_XFRM + struct sec_path *sp = skb_sec_path(skb); + + if (!sp || !sp->olen || sp->len != sp->olen) + return NULL; + + return &sp->ovec[sp->olen - 1]; +#else + return NULL; +#endif +} + +#ifdef CONFIG_XFRM +int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, + unsigned short family); + +static inline bool __xfrm_check_nopolicy(struct net *net, struct sk_buff *skb, + int dir) +{ + if (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) + return net->xfrm.policy_default[dir] == XFRM_USERPOLICY_ACCEPT; + + return false; +} + +static inline bool __xfrm_check_dev_nopolicy(struct sk_buff *skb, + int dir, unsigned short family) +{ + if (dir != XFRM_POLICY_OUT && family == AF_INET) { + /* same dst may be used for traffic originating from + * devices with different policy settings. + */ + return IPCB(skb)->flags & IPSKB_NOPOLICY; + } + return skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY); +} + +static inline int __xfrm_policy_check2(struct sock *sk, int dir, + struct sk_buff *skb, + unsigned int family, int reverse) +{ + struct net *net = dev_net(skb->dev); + int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0); + struct xfrm_offload *xo = xfrm_offload(skb); + struct xfrm_state *x; + + if (sk && sk->sk_policy[XFRM_POLICY_IN]) + return __xfrm_policy_check(sk, ndir, skb, family); + + if (xo) { + x = xfrm_input_state(skb); + if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) + return (xo->flags & CRYPTO_DONE) && + (xo->status & CRYPTO_SUCCESS); + } + + return __xfrm_check_nopolicy(net, skb, dir) || + __xfrm_check_dev_nopolicy(skb, dir, family) || + __xfrm_policy_check(sk, ndir, skb, family); +} + +static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) +{ + return __xfrm_policy_check2(sk, dir, skb, family, 0); +} + +static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) +{ + return xfrm_policy_check(sk, dir, skb, AF_INET); +} + +static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) +{ + return xfrm_policy_check(sk, dir, skb, AF_INET6); +} + +static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1); +} + +static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1); +} + +int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, + unsigned int family, int reverse); + +static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, + unsigned int family) +{ + return __xfrm_decode_session(skb, fl, family, 0); +} + +static inline int xfrm_decode_session_reverse(struct sk_buff *skb, + struct flowi *fl, + unsigned int family) +{ + return __xfrm_decode_session(skb, fl, family, 1); +} + +int __xfrm_route_forward(struct sk_buff *skb, unsigned short family); + +static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family) +{ + struct net *net = dev_net(skb->dev); + + if (!net->xfrm.policy_count[XFRM_POLICY_OUT] && + net->xfrm.policy_default[XFRM_POLICY_OUT] == XFRM_USERPOLICY_ACCEPT) + return true; + + return (skb_dst(skb)->flags & DST_NOXFRM) || + __xfrm_route_forward(skb, family); +} + +static inline int xfrm4_route_forward(struct sk_buff *skb) +{ + return xfrm_route_forward(skb, AF_INET); +} + +static inline int xfrm6_route_forward(struct sk_buff *skb) +{ + return xfrm_route_forward(skb, AF_INET6); +} + +int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk); + +static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) +{ + if (!sk_fullsock(osk)) + return 0; + sk->sk_policy[0] = NULL; + sk->sk_policy[1] = NULL; + if (unlikely(osk->sk_policy[0] || osk->sk_policy[1])) + return __xfrm_sk_clone_policy(sk, osk); + return 0; +} + +int xfrm_policy_delete(struct xfrm_policy *pol, int dir); + +static inline void xfrm_sk_free_policy(struct sock *sk) +{ + struct xfrm_policy *pol; + + pol = rcu_dereference_protected(sk->sk_policy[0], 1); + if (unlikely(pol != NULL)) { + xfrm_policy_delete(pol, XFRM_POLICY_MAX); + sk->sk_policy[0] = NULL; + } + pol = rcu_dereference_protected(sk->sk_policy[1], 1); + if (unlikely(pol != NULL)) { + xfrm_policy_delete(pol, XFRM_POLICY_MAX+1); + sk->sk_policy[1] = NULL; + } +} + +#else + +static inline void xfrm_sk_free_policy(struct sock *sk) {} +static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; } +static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; } +static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } +static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb) +{ + return 1; +} +static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb) +{ + return 1; +} +static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family) +{ + return 1; +} +static inline int xfrm_decode_session_reverse(struct sk_buff *skb, + struct flowi *fl, + unsigned int family) +{ + return -ENOSYS; +} +static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return 1; +} +static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir, + struct sk_buff *skb) +{ + return 1; +} +#endif + +static __inline__ +xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family) +{ + switch (family){ + case AF_INET: + return (xfrm_address_t *)&fl->u.ip4.daddr; + case AF_INET6: + return (xfrm_address_t *)&fl->u.ip6.daddr; + } + return NULL; +} + +static __inline__ +xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family) +{ + switch (family){ + case AF_INET: + return (xfrm_address_t *)&fl->u.ip4.saddr; + case AF_INET6: + return (xfrm_address_t *)&fl->u.ip6.saddr; + } + return NULL; +} + +static __inline__ +void xfrm_flowi_addr_get(const struct flowi *fl, + xfrm_address_t *saddr, xfrm_address_t *daddr, + unsigned short family) +{ + switch(family) { + case AF_INET: + memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4)); + memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4)); + break; + case AF_INET6: + saddr->in6 = fl->u.ip6.saddr; + daddr->in6 = fl->u.ip6.daddr; + break; + } +} + +static __inline__ int +__xfrm4_state_addr_check(const struct xfrm_state *x, + const xfrm_address_t *daddr, const xfrm_address_t *saddr) +{ + if (daddr->a4 == x->id.daddr.a4 && + (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4)) + return 1; + return 0; +} + +static __inline__ int +__xfrm6_state_addr_check(const struct xfrm_state *x, + const xfrm_address_t *daddr, const xfrm_address_t *saddr) +{ + if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) && + (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) || + ipv6_addr_any((struct in6_addr *)saddr) || + ipv6_addr_any((struct in6_addr *)&x->props.saddr))) + return 1; + return 0; +} + +static __inline__ int +xfrm_state_addr_check(const struct xfrm_state *x, + const xfrm_address_t *daddr, const xfrm_address_t *saddr, + unsigned short family) +{ + switch (family) { + case AF_INET: + return __xfrm4_state_addr_check(x, daddr, saddr); + case AF_INET6: + return __xfrm6_state_addr_check(x, daddr, saddr); + } + return 0; +} + +static __inline__ int +xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl, + unsigned short family) +{ + switch (family) { + case AF_INET: + return __xfrm4_state_addr_check(x, + (const xfrm_address_t *)&fl->u.ip4.daddr, + (const xfrm_address_t *)&fl->u.ip4.saddr); + case AF_INET6: + return __xfrm6_state_addr_check(x, + (const xfrm_address_t *)&fl->u.ip6.daddr, + (const xfrm_address_t *)&fl->u.ip6.saddr); + } + return 0; +} + +static inline int xfrm_state_kern(const struct xfrm_state *x) +{ + return atomic_read(&x->tunnel_users); +} + +static inline bool xfrm_id_proto_valid(u8 proto) +{ + switch (proto) { + case IPPROTO_AH: + case IPPROTO_ESP: + case IPPROTO_COMP: +#if IS_ENABLED(CONFIG_IPV6) + case IPPROTO_ROUTING: + case IPPROTO_DSTOPTS: +#endif + return true; + default: + return false; + } +} + +/* IPSEC_PROTO_ANY only matches 3 IPsec protocols, 0 could match all. */ +static inline int xfrm_id_proto_match(u8 proto, u8 userproto) +{ + return (!userproto || proto == userproto || + (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH || + proto == IPPROTO_ESP || + proto == IPPROTO_COMP))); +} + +/* + * xfrm algorithm information + */ +struct xfrm_algo_aead_info { + char *geniv; + u16 icv_truncbits; +}; + +struct xfrm_algo_auth_info { + u16 icv_truncbits; + u16 icv_fullbits; +}; + +struct xfrm_algo_encr_info { + char *geniv; + u16 blockbits; + u16 defkeybits; +}; + +struct xfrm_algo_comp_info { + u16 threshold; +}; + +struct xfrm_algo_desc { + char *name; + char *compat; + u8 available:1; + u8 pfkey_supported:1; + union { + struct xfrm_algo_aead_info aead; + struct xfrm_algo_auth_info auth; + struct xfrm_algo_encr_info encr; + struct xfrm_algo_comp_info comp; + } uinfo; + struct sadb_alg desc; +}; + +/* XFRM protocol handlers. */ +struct xfrm4_protocol { + int (*handler)(struct sk_buff *skb); + int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type); + int (*cb_handler)(struct sk_buff *skb, int err); + int (*err_handler)(struct sk_buff *skb, u32 info); + + struct xfrm4_protocol __rcu *next; + int priority; +}; + +struct xfrm6_protocol { + int (*handler)(struct sk_buff *skb); + int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type); + int (*cb_handler)(struct sk_buff *skb, int err); + int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, + u8 type, u8 code, int offset, __be32 info); + + struct xfrm6_protocol __rcu *next; + int priority; +}; + +/* XFRM tunnel handlers. */ +struct xfrm_tunnel { + int (*handler)(struct sk_buff *skb); + int (*cb_handler)(struct sk_buff *skb, int err); + int (*err_handler)(struct sk_buff *skb, u32 info); + + struct xfrm_tunnel __rcu *next; + int priority; +}; + +struct xfrm6_tunnel { + int (*handler)(struct sk_buff *skb); + int (*cb_handler)(struct sk_buff *skb, int err); + int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, + u8 type, u8 code, int offset, __be32 info); + struct xfrm6_tunnel __rcu *next; + int priority; +}; + +void xfrm_init(void); +void xfrm4_init(void); +int xfrm_state_init(struct net *net); +void xfrm_state_fini(struct net *net); +void xfrm4_state_init(void); +void xfrm4_protocol_init(void); +#ifdef CONFIG_XFRM +int xfrm6_init(void); +void xfrm6_fini(void); +int xfrm6_state_init(void); +void xfrm6_state_fini(void); +int xfrm6_protocol_init(void); +void xfrm6_protocol_fini(void); +#else +static inline int xfrm6_init(void) +{ + return 0; +} +static inline void xfrm6_fini(void) +{ + ; +} +#endif + +#ifdef CONFIG_XFRM_STATISTICS +int xfrm_proc_init(struct net *net); +void xfrm_proc_fini(struct net *net); +#endif + +int xfrm_sysctl_init(struct net *net); +#ifdef CONFIG_SYSCTL +void xfrm_sysctl_fini(struct net *net); +#else +static inline void xfrm_sysctl_fini(struct net *net) +{ +} +#endif + +void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, + struct xfrm_address_filter *filter); +int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, + int (*func)(struct xfrm_state *, int, void*), void *); +void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net); +struct xfrm_state *xfrm_state_alloc(struct net *net); +void xfrm_state_free(struct xfrm_state *x); +struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + const struct flowi *fl, + struct xfrm_tmpl *tmpl, + struct xfrm_policy *pol, int *err, + unsigned short family, u32 if_id); +struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, + xfrm_address_t *daddr, + xfrm_address_t *saddr, + unsigned short family, + u8 mode, u8 proto, u32 reqid); +struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, + unsigned short family); +int xfrm_state_check_expire(struct xfrm_state *x); +#ifdef CONFIG_XFRM_OFFLOAD +static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) +{ + struct xfrm_dev_offload *xdo = &x->xso; + struct net_device *dev = xdo->dev; + + if (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) + return; + + if (dev && dev->xfrmdev_ops && + dev->xfrmdev_ops->xdo_dev_state_update_curlft) + dev->xfrmdev_ops->xdo_dev_state_update_curlft(x); + +} +#else +static inline void xfrm_dev_state_update_curlft(struct xfrm_state *x) {} +#endif +void xfrm_state_insert(struct xfrm_state *x); +int xfrm_state_add(struct xfrm_state *x); +int xfrm_state_update(struct xfrm_state *x); +struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark, + const xfrm_address_t *daddr, __be32 spi, + u8 proto, unsigned short family); +struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u8 proto, + unsigned short family); +#ifdef CONFIG_XFRM_SUB_POLICY +void xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, + unsigned short family); +void xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, + unsigned short family); +#else +static inline void xfrm_tmpl_sort(struct xfrm_tmpl **d, struct xfrm_tmpl **s, + int n, unsigned short family) +{ +} + +static inline void xfrm_state_sort(struct xfrm_state **d, struct xfrm_state **s, + int n, unsigned short family) +{ +} +#endif + +struct xfrmk_sadinfo { + u32 sadhcnt; /* current hash bkts */ + u32 sadhmcnt; /* max allowed hash bkts */ + u32 sadcnt; /* current running count */ +}; + +struct xfrmk_spdinfo { + u32 incnt; + u32 outcnt; + u32 fwdcnt; + u32 inscnt; + u32 outscnt; + u32 fwdscnt; + u32 spdhcnt; + u32 spdhmcnt; +}; + +struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); +int xfrm_state_delete(struct xfrm_state *x); +int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync); +int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); +int xfrm_dev_policy_flush(struct net *net, struct net_device *dev, + bool task_valid); +void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); +void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); +u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); +int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack); +u32 xfrm_state_mtu(struct xfrm_state *x, int mtu); +int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload, + struct netlink_ext_ack *extack); +int xfrm_init_state(struct xfrm_state *x); +int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type); +int xfrm_input_resume(struct sk_buff *skb, int nexthdr); +int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, + int (*finish)(struct net *, struct sock *, + struct sk_buff *)); +int xfrm_trans_queue(struct sk_buff *skb, + int (*finish)(struct net *, struct sock *, + struct sk_buff *)); +int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err); +int xfrm_output(struct sock *sk, struct sk_buff *skb); + +#if IS_ENABLED(CONFIG_NET_PKTGEN) +int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb); +#endif + +void xfrm_local_error(struct sk_buff *skb, int mtu); +int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb); +int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type); +int xfrm4_transport_finish(struct sk_buff *skb, int async); +int xfrm4_rcv(struct sk_buff *skb); + +static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) +{ + XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; + XFRM_SPI_SKB_CB(skb)->family = AF_INET; + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); + return xfrm_input(skb, nexthdr, spi, 0); +} + +int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb); +int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol); +int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol); +int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family); +int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); +void xfrm4_local_error(struct sk_buff *skb, u32 mtu); +int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb); +int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, + struct ip6_tnl *t); +int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type); +int xfrm6_transport_finish(struct sk_buff *skb, int async); +int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t); +int xfrm6_rcv(struct sk_buff *skb); +int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, + xfrm_address_t *saddr, u8 proto); +void xfrm6_local_error(struct sk_buff *skb, u32 mtu); +int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol); +int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol); +int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family); +int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family); +__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr); +__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr); +int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb); + +#ifdef CONFIG_XFRM +void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu); +int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); +int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb); +int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, + int optlen); +#else +static inline int xfrm_user_policy(struct sock *sk, int optname, + sockptr_t optval, int optlen) +{ + return -ENOPROTOOPT; +} +#endif + +struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr, + int family, u32 mark); + +struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); + +void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); +int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, + int (*func)(struct xfrm_policy *, int, int, void*), + void *); +void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net); +int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl); +struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, + const struct xfrm_mark *mark, + u32 if_id, u8 type, int dir, + struct xfrm_selector *sel, + struct xfrm_sec_ctx *ctx, int delete, + int *err); +struct xfrm_policy *xfrm_policy_byid(struct net *net, + const struct xfrm_mark *mark, u32 if_id, + u8 type, int dir, u32 id, int delete, + int *err); +int xfrm_policy_flush(struct net *net, u8 type, bool task_valid); +void xfrm_policy_hash_rebuild(struct net *net); +u32 xfrm_get_acqseq(void); +int verify_spi_info(u8 proto, u32 min, u32 max, struct netlink_ext_ack *extack); +int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi, + struct netlink_ext_ack *extack); +struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, + u8 mode, u32 reqid, u32 if_id, u8 proto, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, int create, + unsigned short family); +int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol); + +#ifdef CONFIG_XFRM_MIGRATE +int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_bundles, + const struct xfrm_kmaddress *k, + const struct xfrm_encap_tmpl *encap); +struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, + u32 if_id); +struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, + struct xfrm_migrate *m, + struct xfrm_encap_tmpl *encap); +int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + struct xfrm_migrate *m, int num_bundles, + struct xfrm_kmaddress *k, struct net *net, + struct xfrm_encap_tmpl *encap, u32 if_id, + struct netlink_ext_ack *extack); +#endif + +int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); +void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid); +int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, + xfrm_address_t *addr); + +void xfrm_input_init(void); +int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq); + +void xfrm_probe_algs(void); +int xfrm_count_pfkey_auth_supported(void); +int xfrm_count_pfkey_enc_supported(void); +struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx); +struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx); +struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id); +struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id); +struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id); +struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe); +struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe); +struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe); +struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, + int probe); + +static inline bool xfrm6_addr_equal(const xfrm_address_t *a, + const xfrm_address_t *b) +{ + return ipv6_addr_equal((const struct in6_addr *)a, + (const struct in6_addr *)b); +} + +static inline bool xfrm_addr_equal(const xfrm_address_t *a, + const xfrm_address_t *b, + sa_family_t family) +{ + switch (family) { + default: + case AF_INET: + return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0; + case AF_INET6: + return xfrm6_addr_equal(a, b); + } +} + +static inline int xfrm_policy_id2dir(u32 index) +{ + return index & 7; +} + +#ifdef CONFIG_XFRM +void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq); +int xfrm_replay_check(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); +void xfrm_replay_notify(struct xfrm_state *x, int event); +int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb); +int xfrm_replay_recheck(struct xfrm_state *x, struct sk_buff *skb, __be32 net_seq); + +static inline int xfrm_aevent_is_on(struct net *net) +{ + struct sock *nlsk; + int ret = 0; + + rcu_read_lock(); + nlsk = rcu_dereference(net->xfrm.nlsk); + if (nlsk) + ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS); + rcu_read_unlock(); + return ret; +} + +static inline int xfrm_acquire_is_on(struct net *net) +{ + struct sock *nlsk; + int ret = 0; + + rcu_read_lock(); + nlsk = rcu_dereference(net->xfrm.nlsk); + if (nlsk) + ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE); + rcu_read_unlock(); + + return ret; +} +#endif + +static inline unsigned int aead_len(struct xfrm_algo_aead *alg) +{ + return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); +} + +static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg) +{ + return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); +} + +static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg) +{ + return sizeof(*alg) + ((alg->alg_key_len + 7) / 8); +} + +static inline unsigned int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn) +{ + return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32); +} + +#ifdef CONFIG_XFRM_MIGRATE +static inline int xfrm_replay_clone(struct xfrm_state *x, + struct xfrm_state *orig) +{ + + x->replay_esn = kmemdup(orig->replay_esn, + xfrm_replay_state_esn_len(orig->replay_esn), + GFP_KERNEL); + if (!x->replay_esn) + return -ENOMEM; + x->preplay_esn = kmemdup(orig->preplay_esn, + xfrm_replay_state_esn_len(orig->preplay_esn), + GFP_KERNEL); + if (!x->preplay_esn) + return -ENOMEM; + + return 0; +} + +static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig) +{ + return kmemdup(orig, aead_len(orig), GFP_KERNEL); +} + + +static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig) +{ + return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL); +} + +static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig) +{ + return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL); +} + +static inline void xfrm_states_put(struct xfrm_state **states, int n) +{ + int i; + for (i = 0; i < n; i++) + xfrm_state_put(*(states + i)); +} + +static inline void xfrm_states_delete(struct xfrm_state **states, int n) +{ + int i; + for (i = 0; i < n; i++) + xfrm_state_delete(*(states + i)); +} +#endif + +void __init xfrm_dev_init(void); + +#ifdef CONFIG_XFRM_OFFLOAD +void xfrm_dev_resume(struct sk_buff *skb); +void xfrm_dev_backlog(struct softnet_data *sd); +struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again); +int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, + struct xfrm_user_offload *xuo, + struct netlink_ext_ack *extack); +int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, + struct xfrm_user_offload *xuo, u8 dir, + struct netlink_ext_ack *extack); +bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); + +static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) +{ + struct xfrm_dev_offload *xso = &x->xso; + + if (xso->dev && xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn) + xso->dev->xfrmdev_ops->xdo_dev_state_advance_esn(x); +} + +static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) +{ + struct xfrm_state *x = dst->xfrm; + struct xfrm_dst *xdst; + + if (!x || !x->type_offload) + return false; + + xdst = (struct xfrm_dst *) dst; + if (!x->xso.offload_handle && !xdst->child->xfrm) + return true; + if (x->xso.offload_handle && (x->xso.dev == xfrm_dst_path(dst)->dev) && + !xdst->child->xfrm) + return true; + + return false; +} + +static inline void xfrm_dev_state_delete(struct xfrm_state *x) +{ + struct xfrm_dev_offload *xso = &x->xso; + + if (xso->dev) + xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); +} + +static inline void xfrm_dev_state_free(struct xfrm_state *x) +{ + struct xfrm_dev_offload *xso = &x->xso; + struct net_device *dev = xso->dev; + + if (dev && dev->xfrmdev_ops) { + if (dev->xfrmdev_ops->xdo_dev_state_free) + dev->xfrmdev_ops->xdo_dev_state_free(x); + xso->dev = NULL; + xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED; + netdev_put(dev, &xso->dev_tracker); + } +} + +static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) +{ + struct xfrm_dev_offload *xdo = &x->xdo; + struct net_device *dev = xdo->dev; + + if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_policy_delete) + dev->xfrmdev_ops->xdo_dev_policy_delete(x); +} + +static inline void xfrm_dev_policy_free(struct xfrm_policy *x) +{ + struct xfrm_dev_offload *xdo = &x->xdo; + struct net_device *dev = xdo->dev; + + if (dev && dev->xfrmdev_ops) { + if (dev->xfrmdev_ops->xdo_dev_policy_free) + dev->xfrmdev_ops->xdo_dev_policy_free(x); + xdo->dev = NULL; + netdev_put(dev, &xdo->dev_tracker); + } +} +#else +static inline void xfrm_dev_resume(struct sk_buff *skb) +{ +} + +static inline void xfrm_dev_backlog(struct softnet_data *sd) +{ +} + +static inline struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) +{ + return skb; +} + +static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo, struct netlink_ext_ack *extack) +{ + return 0; +} + +static inline void xfrm_dev_state_delete(struct xfrm_state *x) +{ +} + +static inline void xfrm_dev_state_free(struct xfrm_state *x) +{ +} + +static inline int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp, + struct xfrm_user_offload *xuo, u8 dir, + struct netlink_ext_ack *extack) +{ + return 0; +} + +static inline void xfrm_dev_policy_delete(struct xfrm_policy *x) +{ +} + +static inline void xfrm_dev_policy_free(struct xfrm_policy *x) +{ +} + +static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) +{ + return false; +} + +static inline void xfrm_dev_state_advance_esn(struct xfrm_state *x) +{ +} + +static inline bool xfrm_dst_offload_ok(struct dst_entry *dst) +{ + return false; +} +#endif + +static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) +{ + if (attrs[XFRMA_MARK]) + memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark)); + else + m->v = m->m = 0; + + return m->v & m->m; +} + +static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m) +{ + int ret = 0; + + if (m->m | m->v) + ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m); + return ret; +} + +static inline __u32 xfrm_smark_get(__u32 mark, struct xfrm_state *x) +{ + struct xfrm_mark *m = &x->props.smark; + + return (m->v & m->m) | (mark & ~m->m); +} + +static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id) +{ + int ret = 0; + + if (if_id) + ret = nla_put_u32(skb, XFRMA_IF_ID, if_id); + return ret; +} + +static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x, + unsigned int family) +{ + bool tunnel = false; + + switch(family) { + case AF_INET: + if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) + tunnel = true; + break; + case AF_INET6: + if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) + tunnel = true; + break; + } + if (tunnel && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)) + return -EINVAL; + + return 0; +} + +extern const int xfrm_msg_min[XFRM_NR_MSGTYPES]; +extern const struct nla_policy xfrma_policy[XFRMA_MAX+1]; + +struct xfrm_translator { + /* Allocate frag_list and put compat translation there */ + int (*alloc_compat)(struct sk_buff *skb, const struct nlmsghdr *src); + + /* Allocate nlmsg with 64-bit translaton of received 32-bit message */ + struct nlmsghdr *(*rcv_msg_compat)(const struct nlmsghdr *nlh, + int maxtype, const struct nla_policy *policy, + struct netlink_ext_ack *extack); + + /* Translate 32-bit user_policy from sockptr */ + int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen); + + struct module *owner; +}; + +#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) +extern int xfrm_register_translator(struct xfrm_translator *xtr); +extern int xfrm_unregister_translator(struct xfrm_translator *xtr); +extern struct xfrm_translator *xfrm_get_translator(void); +extern void xfrm_put_translator(struct xfrm_translator *xtr); +#else +static inline struct xfrm_translator *xfrm_get_translator(void) +{ + return NULL; +} +static inline void xfrm_put_translator(struct xfrm_translator *xtr) +{ +} +#endif + +#if IS_ENABLED(CONFIG_IPV6) +static inline bool xfrm6_local_dontfrag(const struct sock *sk) +{ + int proto; + + if (!sk || sk->sk_family != AF_INET6) + return false; + + proto = sk->sk_protocol; + if (proto == IPPROTO_UDP || proto == IPPROTO_RAW) + return inet6_sk(sk)->dontfrag; + + return false; +} +#endif + +#if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ + (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) + +extern struct metadata_dst __percpu *xfrm_bpf_md_dst; + +int register_xfrm_interface_bpf(void); + +#else + +static inline int register_xfrm_interface_bpf(void) +{ + return 0; +} + +#endif + +#endif /* _NET_XFRM_H */ |