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-rw-r--r--include/net/xfrm.h905
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diff --git a/include/net/xfrm.h b/include/net/xfrm.h
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+++ b/include/net/xfrm.h
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+#ifndef _NET_XFRM_H
+#define _NET_XFRM_H
+
+#include <linux/xfrm.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/crypto.h>
+#include <linux/pfkeyv2.h>
+#include <linux/in6.h>
+
+#include <net/sock.h>
+#include <net/dst.h>
+#include <net/route.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+
+#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
+
+extern struct semaphore xfrm_cfg_sem;
+
+/* 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.
+ */
+
+/* Full description of state of transformer. */
+struct xfrm_state
+{
+ /* Note: bydst is re-used during gc */
+ struct list_head bydst;
+ struct list_head byspi;
+
+ atomic_t refcnt;
+ spinlock_t lock;
+
+ struct xfrm_id id;
+ struct xfrm_selector sel;
+
+ /* Key manger bits */
+ struct {
+ u8 state;
+ u8 dying;
+ u32 seq;
+ } 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;
+ } props;
+
+ struct xfrm_lifetime_cfg lft;
+
+ /* Data for transformer */
+ struct xfrm_algo *aalg;
+ struct xfrm_algo *ealg;
+ struct xfrm_algo *calg;
+
+ /* Data for encapsulator */
+ struct xfrm_encap_tmpl *encap;
+
+ /* 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;
+
+ /* Statistics */
+ struct xfrm_stats stats;
+
+ struct xfrm_lifetime_cur curlft;
+ struct timer_list timer;
+
+ /* Reference to data common to all the instances of this
+ * transformer. */
+ struct xfrm_type *type;
+
+ /* Private data of this transformer, format is opaque,
+ * interpreted by xfrm_type methods. */
+ void *data;
+};
+
+enum {
+ XFRM_STATE_VOID,
+ XFRM_STATE_ACQ,
+ XFRM_STATE_VALID,
+ XFRM_STATE_ERROR,
+ XFRM_STATE_EXPIRED,
+ XFRM_STATE_DEAD
+};
+
+struct xfrm_type;
+struct xfrm_dst;
+struct xfrm_policy_afinfo {
+ unsigned short family;
+ rwlock_t lock;
+ struct xfrm_type_map *type_map;
+ struct dst_ops *dst_ops;
+ void (*garbage_collect)(void);
+ int (*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
+ struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
+ int (*bundle_create)(struct xfrm_policy *policy,
+ struct xfrm_state **xfrm,
+ int nx,
+ struct flowi *fl,
+ struct dst_entry **dst_p);
+ void (*decode_session)(struct sk_buff *skb,
+ struct flowi *fl);
+};
+
+extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
+extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
+
+#define XFRM_ACQ_EXPIRES 30
+
+struct xfrm_tmpl;
+struct xfrm_state_afinfo {
+ unsigned short family;
+ rwlock_t lock;
+ struct list_head *state_bydst;
+ struct list_head *state_byspi;
+ void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
+ struct xfrm_tmpl *tmpl,
+ xfrm_address_t *daddr, xfrm_address_t *saddr);
+ struct xfrm_state *(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
+ struct xfrm_state *(*find_acq)(u8 mode, u32 reqid, u8 proto,
+ xfrm_address_t *daddr, xfrm_address_t *saddr,
+ int create);
+};
+
+extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
+extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
+
+extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
+
+struct xfrm_decap_state;
+struct xfrm_type
+{
+ char *description;
+ struct module *owner;
+ __u8 proto;
+
+ int (*init_state)(struct xfrm_state *x, void *args);
+ void (*destructor)(struct xfrm_state *);
+ int (*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
+ int (*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
+ int (*output)(struct xfrm_state *, struct sk_buff *pskb);
+ /* Estimate maximal size of result of transformation of a dgram */
+ u32 (*get_max_size)(struct xfrm_state *, int size);
+};
+
+struct xfrm_type_map {
+ rwlock_t lock;
+ struct xfrm_type *map[256];
+};
+
+extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
+extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
+extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
+extern void xfrm_put_type(struct xfrm_type *type);
+
+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;
+
+ __u32 reqid;
+
+/* Mode: transport/tunnel */
+ __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;
+
+/* Bit mask of algos allowed for acquisition */
+ __u32 aalgos;
+ __u32 ealgos;
+ __u32 calgos;
+};
+
+#define XFRM_MAX_DEPTH 4
+
+struct xfrm_policy
+{
+ struct xfrm_policy *next;
+ struct list_head list;
+
+ /* This lock only affects elements except for entry. */
+ rwlock_t lock;
+ atomic_t refcnt;
+ struct timer_list timer;
+
+ u32 priority;
+ u32 index;
+ struct xfrm_selector selector;
+ struct xfrm_lifetime_cfg lft;
+ struct xfrm_lifetime_cur curlft;
+ struct dst_entry *bundles;
+ __u16 family;
+ __u8 action;
+ __u8 flags;
+ __u8 dead;
+ __u8 xfrm_nr;
+ struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
+};
+
+#define XFRM_KM_TIMEOUT 30
+
+struct xfrm_mgr
+{
+ struct list_head list;
+ char *id;
+ int (*notify)(struct xfrm_state *x, int event);
+ int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
+ struct xfrm_policy *(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
+ int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
+ int (*notify_policy)(struct xfrm_policy *x, int dir, int event);
+};
+
+extern int xfrm_register_km(struct xfrm_mgr *km);
+extern int xfrm_unregister_km(struct xfrm_mgr *km);
+
+
+extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
+
+static inline void xfrm_pol_hold(struct xfrm_policy *policy)
+{
+ if (likely(policy != NULL))
+ atomic_inc(&policy->refcnt);
+}
+
+extern void __xfrm_policy_destroy(struct xfrm_policy *policy);
+
+static inline void xfrm_pol_put(struct xfrm_policy *policy)
+{
+ if (atomic_dec_and_test(&policy->refcnt))
+ __xfrm_policy_destroy(policy);
+}
+
+#define XFRM_DST_HSIZE 1024
+
+static __inline__
+unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
+{
+ unsigned h;
+ h = ntohl(addr->a4);
+ h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
+ return h;
+}
+
+static __inline__
+unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
+{
+ unsigned h;
+ h = ntohl(addr->a6[2]^addr->a6[3]);
+ h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
+ return h;
+}
+
+static __inline__
+unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
+{
+ switch (family) {
+ case AF_INET:
+ return __xfrm4_dst_hash(addr);
+ case AF_INET6:
+ return __xfrm6_dst_hash(addr);
+ }
+ return 0;
+}
+
+static __inline__
+unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
+{
+ unsigned h;
+ h = ntohl(addr->a4^spi^proto);
+ h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
+ return h;
+}
+
+static __inline__
+unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
+{
+ unsigned h;
+ h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
+ h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
+ return h;
+}
+
+static __inline__
+unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
+{
+ switch (family) {
+ case AF_INET:
+ return __xfrm4_spi_hash(addr, spi, proto);
+ case AF_INET6:
+ return __xfrm6_spi_hash(addr, spi, proto);
+ }
+ return 0; /*XXX*/
+}
+
+extern void __xfrm_state_destroy(struct xfrm_state *);
+
+static inline void xfrm_state_put(struct xfrm_state *x)
+{
+ if (atomic_dec_and_test(&x->refcnt))
+ __xfrm_state_destroy(x);
+}
+
+static inline void xfrm_state_hold(struct xfrm_state *x)
+{
+ atomic_inc(&x->refcnt);
+}
+
+static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
+{
+ __u32 *a1 = token1;
+ __u32 *a2 = token2;
+ int pdw;
+ 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 0;
+
+ if (pbi) {
+ __u32 mask;
+
+ mask = htonl((0xffffffff) << (32 - pbi));
+
+ if ((a1[pdw] ^ a2[pdw]) & mask)
+ return 0;
+ }
+
+ return 1;
+}
+
+static __inline__
+u16 xfrm_flowi_sport(struct flowi *fl)
+{
+ u16 port;
+ switch(fl->proto) {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ case IPPROTO_SCTP:
+ port = fl->fl_ip_sport;
+ break;
+ case IPPROTO_ICMP:
+ case IPPROTO_ICMPV6:
+ port = htons(fl->fl_icmp_type);
+ break;
+ default:
+ port = 0; /*XXX*/
+ }
+ return port;
+}
+
+static __inline__
+u16 xfrm_flowi_dport(struct flowi *fl)
+{
+ u16 port;
+ switch(fl->proto) {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ case IPPROTO_SCTP:
+ port = fl->fl_ip_dport;
+ break;
+ case IPPROTO_ICMP:
+ case IPPROTO_ICMPV6:
+ port = htons(fl->fl_icmp_code);
+ break;
+ default:
+ port = 0; /*XXX*/
+ }
+ return port;
+}
+
+static inline int
+__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
+{
+ return addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
+ addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
+ !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
+ !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
+ (fl->proto == sel->proto || !sel->proto) &&
+ (fl->oif == sel->ifindex || !sel->ifindex);
+}
+
+static inline int
+__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
+{
+ return addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
+ addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
+ !((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
+ !((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
+ (fl->proto == sel->proto || !sel->proto) &&
+ (fl->oif == sel->ifindex || !sel->ifindex);
+}
+
+static inline int
+xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
+ unsigned short family)
+{
+ switch (family) {
+ case AF_INET:
+ return __xfrm4_selector_match(sel, fl);
+ case AF_INET6:
+ return __xfrm6_selector_match(sel, fl);
+ }
+ return 0;
+}
+
+/* A struct encoding bundle of transformations to apply to some set of flow.
+ *
+ * dst->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 xfrm_dst *next;
+ struct dst_entry dst;
+ struct rtable rt;
+ struct rt6_info rt6;
+ } u;
+ struct dst_entry *route;
+ u32 route_mtu_cached;
+ u32 child_mtu_cached;
+};
+
+/* Decapsulation state, used by the input to store data during
+ * decapsulation procedure, to be used later (during the policy
+ * check
+ */
+struct xfrm_decap_state {
+ char decap_data[20];
+ __u16 decap_type;
+};
+
+struct sec_decap_state {
+ struct xfrm_state *xvec;
+ struct xfrm_decap_state decap;
+};
+
+struct sec_path
+{
+ atomic_t refcnt;
+ int len;
+ struct sec_decap_state x[XFRM_MAX_DEPTH];
+};
+
+static inline struct sec_path *
+secpath_get(struct sec_path *sp)
+{
+ if (sp)
+ atomic_inc(&sp->refcnt);
+ return sp;
+}
+
+extern void __secpath_destroy(struct sec_path *sp);
+
+static inline void
+secpath_put(struct sec_path *sp)
+{
+ if (sp && atomic_dec_and_test(&sp->refcnt))
+ __secpath_destroy(sp);
+}
+
+extern struct sec_path *secpath_dup(struct sec_path *src);
+
+static inline void
+secpath_reset(struct sk_buff *skb)
+{
+#ifdef CONFIG_XFRM
+ secpath_put(skb->sp);
+ skb->sp = NULL;
+#endif
+}
+
+static inline int
+__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
+{
+ return (tmpl->saddr.a4 &&
+ tmpl->saddr.a4 != x->props.saddr.a4);
+}
+
+static inline int
+__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
+{
+ return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
+ ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
+}
+
+static inline int
+xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, 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
+
+extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
+
+static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
+{
+ if (sk && sk->sk_policy[XFRM_POLICY_IN])
+ return __xfrm_policy_check(sk, dir, skb, family);
+
+ return (!xfrm_policy_list[dir] && !skb->sp) ||
+ (skb->dst->flags & DST_NOPOLICY) ||
+ __xfrm_policy_check(sk, dir, skb, family);
+}
+
+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);
+}
+
+
+extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
+
+static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
+{
+ return !xfrm_policy_list[XFRM_POLICY_OUT] ||
+ (skb->dst->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);
+}
+
+extern int __xfrm_sk_clone_policy(struct sock *sk);
+
+static inline int xfrm_sk_clone_policy(struct sock *sk)
+{
+ if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
+ return __xfrm_sk_clone_policy(sk);
+ return 0;
+}
+
+extern void xfrm_policy_delete(struct xfrm_policy *pol, int dir);
+
+static inline void xfrm_sk_free_policy(struct sock *sk)
+{
+ if (unlikely(sk->sk_policy[0] != NULL)) {
+ xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
+ sk->sk_policy[0] = NULL;
+ }
+ if (unlikely(sk->sk_policy[1] != NULL)) {
+ xfrm_policy_delete(sk->sk_policy[1], 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) { 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;
+}
+#endif
+
+static __inline__
+xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
+{
+ switch (family){
+ case AF_INET:
+ return (xfrm_address_t *)&fl->fl4_dst;
+ case AF_INET6:
+ return (xfrm_address_t *)&fl->fl6_dst;
+ }
+ return NULL;
+}
+
+static __inline__
+xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
+{
+ switch (family){
+ case AF_INET:
+ return (xfrm_address_t *)&fl->fl4_src;
+ case AF_INET6:
+ return (xfrm_address_t *)&fl->fl6_src;
+ }
+ return NULL;
+}
+
+static __inline__ int
+__xfrm4_state_addr_check(struct xfrm_state *x,
+ xfrm_address_t *daddr, 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(struct xfrm_state *x,
+ xfrm_address_t *daddr, xfrm_address_t *saddr)
+{
+ if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
+ (!ipv6_addr_cmp((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(struct xfrm_state *x,
+ xfrm_address_t *daddr, 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_kern(struct xfrm_state *x)
+{
+ return atomic_read(&x->tunnel_users);
+}
+
+/*
+ * xfrm algorithm information
+ */
+struct xfrm_algo_auth_info {
+ u16 icv_truncbits;
+ u16 icv_fullbits;
+};
+
+struct xfrm_algo_encr_info {
+ u16 blockbits;
+ u16 defkeybits;
+};
+
+struct xfrm_algo_comp_info {
+ u16 threshold;
+};
+
+struct xfrm_algo_desc {
+ char *name;
+ u8 available:1;
+ union {
+ struct xfrm_algo_auth_info auth;
+ struct xfrm_algo_encr_info encr;
+ struct xfrm_algo_comp_info comp;
+ } uinfo;
+ struct sadb_alg desc;
+};
+
+/* XFRM tunnel handlers. */
+struct xfrm_tunnel {
+ int (*handler)(struct sk_buff *skb);
+ void (*err_handler)(struct sk_buff *skb, void *info);
+};
+
+struct xfrm6_tunnel {
+ int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
+ void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ int type, int code, int offset, __u32 info);
+};
+
+extern void xfrm_init(void);
+extern void xfrm4_init(void);
+extern void xfrm6_init(void);
+extern void xfrm6_fini(void);
+extern void xfrm_state_init(void);
+extern void xfrm4_state_init(void);
+extern void xfrm4_state_fini(void);
+extern void xfrm6_state_init(void);
+extern void xfrm6_state_fini(void);
+
+extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
+extern struct xfrm_state *xfrm_state_alloc(void);
+extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
+ struct flowi *fl, struct xfrm_tmpl *tmpl,
+ struct xfrm_policy *pol, int *err,
+ unsigned short family);
+extern int xfrm_state_check_expire(struct xfrm_state *x);
+extern void xfrm_state_insert(struct xfrm_state *x);
+extern int xfrm_state_add(struct xfrm_state *x);
+extern int xfrm_state_update(struct xfrm_state *x);
+extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
+extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
+extern void xfrm_state_delete(struct xfrm_state *x);
+extern void xfrm_state_flush(u8 proto);
+extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
+extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
+extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
+extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
+extern int xfrm4_rcv(struct sk_buff *skb);
+extern int xfrm4_output(struct sk_buff *skb);
+extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
+extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
+extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
+extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
+extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
+extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
+extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
+extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
+extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
+extern int xfrm6_output(struct sk_buff *skb);
+
+#ifdef CONFIG_XFRM
+extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
+extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
+extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
+#else
+static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
+{
+ return -ENOPROTOOPT;
+}
+
+static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
+{
+ /* should not happen */
+ kfree_skb(skb);
+ return 0;
+}
+static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
+{
+ return -EINVAL;
+}
+#endif
+
+struct xfrm_policy *xfrm_policy_alloc(int gfp);
+extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
+int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
+struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
+ int delete);
+struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
+void xfrm_policy_flush(void);
+u32 xfrm_get_acqseq(void);
+void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
+struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
+ xfrm_address_t *daddr, xfrm_address_t *saddr,
+ int create, unsigned short family);
+extern void xfrm_policy_flush(void);
+extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
+extern int xfrm_flush_bundles(void);
+extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
+extern void xfrm_init_pmtu(struct dst_entry *dst);
+
+extern wait_queue_head_t km_waitq;
+extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
+extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
+
+extern void xfrm_input_init(void);
+extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
+
+extern void xfrm_probe_algs(void);
+extern int xfrm_count_auth_supported(void);
+extern int xfrm_count_enc_supported(void);
+extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
+extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
+extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
+extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
+extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
+extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
+extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
+extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
+
+struct crypto_tfm;
+typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
+
+extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
+ int offset, int len, icv_update_fn_t icv_update);
+
+static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
+ int family)
+{
+ switch (family) {
+ default:
+ case AF_INET:
+ return a->a4 - b->a4;
+ case AF_INET6:
+ return ipv6_addr_cmp((struct in6_addr *)a,
+ (struct in6_addr *)b);
+ }
+}
+
+#endif /* _NET_XFRM_H */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.