MFC r304572 (by bz):

  Remove the kernel optoion for IPSEC_FILTERTUNNEL, which was deprecated
  more than 7 years ago in favour of a sysctl in r192648.

MFC r305122:
  Remove redundant sanity checks from ipsec[46]_common_input_cb().

  This check already has been done in the each protocol callback.

MFC r309144,309174,309201 (by fabient):
  IPsec RFC6479 support for replay window sizes up to 2^32 - 32 packets.

  Since the previous algorithm, based on bit shifting, does not scale
  with large replay windows, the algorithm used here is based on
  RFC 6479: IPsec Anti-Replay Algorithm without Bit Shifting.
  The replay window will be fast to be updated, but will cost as many bits
  in RAM as its size.

  The previous implementation did not provide a lock on the replay window,
  which may lead to replay issues.

  Obtained from:	emeric.poupon@stormshield.eu
  Sponsored by:	Stormshield
  Differential Revision:	https://reviews.freebsd.org/D8468

MFC r309143,309146 (by fabient):
  In a dual processor system (2*6 cores) during IPSec throughput tests,
  we see a lot of contention on the arc4 lock, used to generate the IV
  of the ESP output packets.

  The idea of this patch is to split this mutex in order to reduce the
  contention on this lock.

  Update r309143 to prevent false sharing.

  Reviewed by:	delphij, markm, ache
  Approved by:	so
  Obtained from: emeric.poupon@stormshield.eu
  Sponsored by:	Stormshield
  Differential Revision:	https://reviews.freebsd.org/D8130

MFC r313330:
  Merge projects/ipsec into head/.

   Small summary
   -------------

  o Almost all IPsec releated code was moved into sys/netipsec.
  o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel
    option IPSEC_SUPPORT added. It enables support for loading
    and unloading of ipsec.ko and tcpmd5.ko kernel modules.
  o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by
    default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type
    support was removed. Added TCP/UDP checksum handling for
    inbound packets that were decapsulated by transport mode SAs.
    setkey(8) modified to show run-time NAT-T configuration of SA.
  o New network pseudo interface if_ipsec(4) added. For now it is
    build as part of ipsec.ko module (or with IPSEC kernel).
    It implements IPsec virtual tunnels to create route-based VPNs.
  o The network stack now invokes IPsec functions using special
    methods. The only one header file <netipsec/ipsec_support.h>
    should be included to declare all the needed things to work
    with IPsec.
  o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed.
    Now these protocols are handled directly via IPsec methods.
  o TCP_SIGNATURE support was reworked to be more close to RFC.
  o PF_KEY SADB was reworked:
    - now all security associations stored in the single SPI namespace,
      and all SAs MUST have unique SPI.
    - several hash tables added to speed up lookups in SADB.
    - SADB now uses rmlock to protect access, and concurrent threads
      can do SA lookups in the same time.
    - many PF_KEY message handlers were reworked to reflect changes
      in SADB.
    - SADB_UPDATE message was extended to support new PF_KEY headers:
      SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They
      can be used by IKE daemon to change SA addresses.
  o ipsecrequest and secpolicy structures were cardinally changed to
    avoid locking protection for ipsecrequest. Now we support
    only limited number (4) of bundled SAs, but they are supported
    for both INET and INET6.
  o INPCB security policy cache was introduced. Each PCB now caches
    used security policies to avoid SP lookup for each packet.
  o For inbound security policies added the mode, when the kernel does
    check for full history of applied IPsec transforms.
  o References counting rules for security policies and security
    associations were changed. The proper SA locking added into xform
    code.
  o xform code was also changed. Now it is possible to unregister xforms.
    tdb_xxx structures were changed and renamed to reflect changes in
    SADB/SPDB, and changed rules for locking and refcounting.

  Obtained from:	Yandex LLC
  Relnotes:	yes
  Sponsored by:	Yandex LLC
  Differential Revision:	https://reviews.freebsd.org/D9352

MFC r313331:
  Add removed headers into the ObsoleteFiles.inc.

MFC r313561 (by glebius):
  Move tcp_fields_to_net() static inline into tcp_var.h, just below its
  friend tcp_fields_to_host(). There is third party code that also uses
  this inline.

MFC r313697:
  Remove IPsec related PCB code from SCTP.

  The inpcb structure has inp_sp pointer that is initialized by
  ipsec_init_pcbpolicy() function. This pointer keeps strorage for IPsec
  security policies associated with a specific socket.
  An application can use IP_IPSEC_POLICY and IPV6_IPSEC_POLICY socket
  options to configure these security policies. Then ip[6]_output()
  uses inpcb pointer to specify that an outgoing packet is associated
  with some socket. And IPSEC_OUTPUT() method can use a security policy
  stored in the inp_sp. For inbound packet the protocol-specific input
  routine uses IPSEC_CHECK_POLICY() method to check that a packet conforms
  to inbound security policy configured in the inpcb.

  SCTP protocol doesn't specify inpcb for ip[6]_output() when it sends
  packets. Thus IPSEC_OUTPUT() method does not consider such packets as
  associated with some socket and can not apply security policies
  from inpcb, even if they are configured. Since IPSEC_CHECK_POLICY()
  method is called from protocol-specific input routine, it can specify
  inpcb pointer and associated with socket inbound policy will be
  checked. But there are two problems:
  1. Such check is asymmetric, becasue we can not apply security policy
  from inpcb for outgoing packet.
  2. IPSEC_CHECK_POLICY() expects that caller holds INPCB lock and
  access to inp_sp is protected. But for SCTP this is not correct,
  becasue SCTP uses own locks to protect inpcb.

  To fix these problems remove IPsec related PCB code from SCTP.
  This imply that IP_IPSEC_POLICY and IPV6_IPSEC_POLICY socket options
  will be not applicable to SCTP sockets. To be able correctly check
  inbound security policies for SCTP, mark its protocol header with
  the PR_LASTHDR flag.

  Differential Revision:	https://reviews.freebsd.org/D9538

MFC r313746:
  Add missing check to fix the build with IPSEC_SUPPORT and without MAC.

MFC r313805:
  Fix LINT build for powerpc.

  Build kernel modules support only when both IPSEC and TCP_SIGNATURE
  are not defined.

MFC r313922:
  For translated packets do not adjust UDP checksum if it is zero.

  In case when decrypted and decapsulated packet is an UDP datagram,
  check that its checksum is not zero before doing incremental checksum
  adjustment.

MFC r314339:
  Document that the size of AH ICV for HMAC-SHA2-NNN should be half of
  NNN bits as described in RFC4868.

  PR:		215978

MFC r314812:
  Introduce the concept of IPsec security policies scope.

  Currently are defined three scopes: global, ifnet, and pcb.
  Generic security policies that IKE daemon can add via PF_KEY interface
  or an administrator creates with setkey(8) utility have GLOBAL scope.
  Such policies can be applied by the kernel to outgoing packets and checked
  agains inbound packets after IPsec processing.
  Security policies created by if_ipsec(4) interfaces have IFNET scope.
  Such policies are applied to packets that are passed through if_ipsec(4)
  interface.
  And security policies created by application using setsockopt()
  IP_IPSEC_POLICY option have PCB scope. Such policies are applied to
  packets related to specific socket. Currently there is no way to list
  PCB policies via setkey(8) utility.

  Modify setkey(8) and libipsec(3) to be able distinguish the scope of
  security policies in the `setkey -DP` listing. Add two optional flags:
  '-t' to list only policies related to virtual *tunneling* interfaces,
  i.e. policies with IFNET scope, and '-g' to list only policies with GLOBAL
  scope. By default policies from all scopes are listed.

  To implement this PF_KEY's sadb_x_policy structure was modified.
  sadb_x_policy_reserved field is used to pass the policy scope from the
  kernel to userland. SADB_SPDDUMP message extended to support filtering
  by scope: sadb_msg_satype field is used to specify bit mask of requested
  scopes.

  For IFNET policies the sadb_x_policy_priority field of struct sadb_x_policy
  is used to pass if_ipsec's interface if_index to the userland. For GLOBAL
  policies sadb_x_policy_priority is used only to manage order of security
  policies in the SPDB. For IFNET policies it is not used, so it can be used
  to keep if_index.

  After this change the output of `setkey -DP` now looks like:
  # setkey -DPt
  0.0.0.0/0[any] 0.0.0.0/0[any] any
  	in ipsec
  	esp/tunnel/87.250.242.144-87.250.242.145/unique:145
  	spid=7 seq=3 pid=58025 scope=ifnet ifname=ipsec0
  	refcnt=1
  # setkey -DPg
  ::/0 ::/0 icmp6 135,0
  	out none
  	spid=5 seq=1 pid=872 scope=global
  	refcnt=1

  Obtained from:	Yandex LLC
  Sponsored by:	Yandex LLC
  Differential Revision:	https://reviews.freebsd.org/D9805

PR:		212018
Relnotes:	yes
Sponsored by:	Yandex LLC

1 files changed, 86 insertions, 98 deletions

diff --git a/sys/netipsec/ipsec.h b/sys/netipsec/ipsec.h
index 0e427e3..49413e2 100644
--- a/sys/netipsec/ipsec.h
+++ b/sys/netipsec/ipsec.h
@@ -53,11 +53,6 @@
 
 #define	IPSEC_ASSERT(_c,_m) KASSERT(_c, _m)
 
-#define	IPSEC_IS_PRIVILEGED_SO(_so) \
-	((_so)->so_cred != NULL && \
-	 priv_check_cred((_so)->so_cred, PRIV_NETINET_IPSEC, 0) \
-	 == 0)
-
 /*
  * Security Policy Index
  * Ensure that both address families in the "src" and "dst" are same.
@@ -65,35 +60,41 @@
  * specifies ICMPv6 type, and the port field in "dst" specifies ICMPv6 code.
  */
 struct secpolicyindex {
-	u_int8_t dir;			/* direction of packet flow, see below */
 	union sockaddr_union src;	/* IP src address for SP */
 	union sockaddr_union dst;	/* IP dst address for SP */
-	u_int8_t prefs;			/* prefix length in bits for src */
-	u_int8_t prefd;			/* prefix length in bits for dst */
-	u_int16_t ul_proto;		/* upper layer Protocol */
-#ifdef notyet
-	uid_t uids;
-	uid_t uidd;
-	gid_t gids;
-	gid_t gidd;
-#endif
+	uint8_t ul_proto;		/* upper layer Protocol */
+	uint8_t dir;			/* direction of packet flow */
+	uint8_t prefs;			/* prefix length in bits for src */
+	uint8_t prefd;			/* prefix length in bits for dst */
+};
+
+/* Request for IPsec */
+struct ipsecrequest {
+	struct secasindex saidx;/* hint for search proper SA */
+				/* if __ss_len == 0 then no address specified.*/
+	u_int level;		/* IPsec level defined below. */
 };
 
 /* Security Policy Data Base */
 struct secpolicy {
 	TAILQ_ENTRY(secpolicy) chain;
+	LIST_ENTRY(secpolicy) idhash;
+	LIST_ENTRY(secpolicy) drainq;
 
 	struct secpolicyindex spidx;	/* selector */
-	struct ipsecrequest *req;
-				/* pointer to the ipsec request tree, */
-				/* if policy == IPSEC else this value == NULL.*/
-	u_int refcnt;			/* reference count */
+#define	IPSEC_MAXREQ		4
+	struct ipsecrequest *req[IPSEC_MAXREQ];
+	u_int tcount;			/* IPsec transforms count */
+	volatile u_int refcnt;		/* reference count */
 	u_int policy;			/* policy_type per pfkeyv2.h */
 	u_int state;
 #define	IPSEC_SPSTATE_DEAD	0
-#define	IPSEC_SPSTATE_ALIVE	1
-	u_int32_t priority;		/* priority of this policy */
-	u_int32_t id;			/* It's unique number on the system. */
+#define	IPSEC_SPSTATE_LARVAL	1
+#define	IPSEC_SPSTATE_ALIVE	2
+#define	IPSEC_SPSTATE_PCB	3
+#define	IPSEC_SPSTATE_IFNET	4
+	uint32_t priority;		/* priority of this policy */
+	uint32_t id;			/* It's unique number on the system. */
 	/*
 	 * lifetime handler.
 	 * the policy can be used without limitiation if both lifetime and
@@ -107,41 +108,25 @@ struct secpolicy {
 	long validtime;		/* duration this policy is valid without use */
 };
 
-/* Request for IPsec */
-struct ipsecrequest {
-	struct ipsecrequest *next;
-				/* pointer to next structure */
-				/* If NULL, it means the end of chain. */
-	struct secasindex saidx;/* hint for search proper SA */
-				/* if __ss_len == 0 then no address specified.*/
-	u_int level;		/* IPsec level defined below. */
-
-	struct secasvar *sav;	/* place holder of SA for use */
-	struct secpolicy *sp;	/* back pointer to SP */
-	struct rwlock lock;	/* to interlock updates */
-};
-
 /*
- * Need recursion for when crypto callbacks happen directly,
- * as in the case of software crypto.  Need to look at how
- * hard it is to remove this...
+ * PCB security policies.
+ * Application can setup private security policies for socket.
+ * Such policies can have IPSEC, BYPASS and ENTRUST type.
+ * By default, policies are set to NULL. This means that they have ENTRUST type.
+ * When application sets BYPASS or IPSEC type policy, the flags field
+ * is also updated. When flags is not set, the system could store
+ * used security policy into the sp_in/sp_out pointer to speed up further
+ * lookups.
  */
-#define	IPSECREQUEST_LOCK_INIT(_isr) \
-	rw_init_flags(&(_isr)->lock, "ipsec request", RW_RECURSE)
-#define	IPSECREQUEST_LOCK(_isr)		rw_rlock(&(_isr)->lock)
-#define	IPSECREQUEST_UNLOCK(_isr)	rw_runlock(&(_isr)->lock)
-#define	IPSECREQUEST_WLOCK(_isr)	rw_wlock(&(_isr)->lock)
-#define	IPSECREQUEST_WUNLOCK(_isr)	rw_wunlock(&(_isr)->lock)
-#define	IPSECREQUEST_UPGRADE(_isr)	rw_try_upgrade(&(_isr)->lock)
-#define	IPSECREQUEST_DOWNGRADE(_isr)	rw_downgrade(&(_isr)->lock)
-#define	IPSECREQUEST_LOCK_DESTROY(_isr)	rw_destroy(&(_isr)->lock)
-#define	IPSECREQUEST_LOCK_ASSERT(_isr)	rw_assert(&(_isr)->lock, RA_LOCKED)
-
-/* security policy in PCB */
 struct inpcbpolicy {
-	struct secpolicy *sp_in;
-	struct secpolicy *sp_out;
-	int priv;			/* privileged socket ? */
+	struct secpolicy	*sp_in;
+	struct secpolicy	*sp_out;
+
+	uint32_t		genid;
+	uint16_t		flags;
+#define	INP_INBOUND_POLICY	0x0001
+#define	INP_OUTBOUND_POLICY	0x0002
+	uint16_t		hdrsz;
 };
 
 /* SP acquiring list table. */
@@ -156,6 +141,9 @@ struct secspacq {
 };
 #endif /* _KERNEL */
 
+/* buffer size for formatted output of ipsec address */
+#define	IPSEC_ADDRSTRLEN	(INET6_ADDRSTRLEN + 11)
+
 /* according to IANA assignment, port 0x0000 and proto 0xff are reserved. */
 #define IPSEC_PORT_ANY		0
 #define IPSEC_ULPROTO_ANY	255
@@ -191,6 +179,12 @@ struct secspacq {
 #define IPSEC_POLICY_ENTRUST	3	/* consulting SPD if present. */
 #define IPSEC_POLICY_BYPASS	4	/* only for privileged socket. */
 
+/* Policy scope */
+#define	IPSEC_POLICYSCOPE_ANY		0x00	/* unspecified */
+#define	IPSEC_POLICYSCOPE_GLOBAL	0x01	/* global scope */
+#define	IPSEC_POLICYSCOPE_IFNET		0x02	/* if_ipsec(4) scope */
+#define	IPSEC_POLICYSCOPE_PCB		0x04	/* PCB scope */
+
 /* Security protocol level */
 #define	IPSEC_LEVEL_DEFAULT	0	/* reference to system default */
 #define	IPSEC_LEVEL_USE		1	/* use SA if present. */
@@ -288,6 +282,7 @@ VNET_DECLARE(int, ip4_ipsec_dfbit);
 VNET_DECLARE(int, ip4_ipsec_ecn);
 VNET_DECLARE(int, ip4_esp_randpad);
 VNET_DECLARE(int, crypto_support);
+VNET_DECLARE(int, natt_cksum_policy);
 
 #define	IPSECSTAT_INC(name)	\
     VNET_PCPUSTAT_ADD(struct ipsecstat, ipsec4stat, name, 1)
@@ -300,59 +295,52 @@ VNET_DECLARE(int, crypto_support);
 #define	V_ip4_ipsec_ecn		VNET(ip4_ipsec_ecn)
 #define	V_ip4_esp_randpad	VNET(ip4_esp_randpad)
 #define	V_crypto_support	VNET(crypto_support)
+#define	V_natt_cksum_policy	VNET(natt_cksum_policy)
 
 #define ipseclog(x)	do { if (V_ipsec_debug) log x; } while (0)
 /* for openbsd compatibility */
 #define	DPRINTF(x)	do { if (V_ipsec_debug) printf x; } while (0)
 
-extern	struct ipsecrequest *ipsec_newisr(void);
-extern	void ipsec_delisr(struct ipsecrequest *);
-
-struct tdb_ident;
-extern struct secpolicy *ipsec_getpolicy(struct tdb_ident*, u_int);
 struct inpcb;
-extern struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, u_int,
-    int *, struct inpcb *);
-extern struct secpolicy * ipsec_getpolicybyaddr(const struct mbuf *, u_int,
-    int *);
-
-struct inpcb;
-extern int ipsec_init_policy(struct socket *so, struct inpcbpolicy **);
-extern int ipsec_copy_policy(struct inpcbpolicy *, struct inpcbpolicy *);
-extern u_int ipsec_get_reqlevel(struct ipsecrequest *);
-
-extern int ipsec_set_policy(struct inpcb *inp, int optname,
-	caddr_t request, size_t len, struct ucred *cred);
-extern int ipsec_get_policy(struct inpcb *inpcb, caddr_t request,
-    size_t len, struct mbuf **mp);
-extern int ipsec_delete_pcbpolicy(struct inpcb *);
-extern int ipsec4_in_reject(const struct mbuf *, struct inpcb *);
-
-struct secas;
-struct tcpcb;
-extern int ipsec_chkreplay(u_int32_t, struct secasvar *);
-extern int ipsec_updatereplay(u_int32_t, struct secasvar *);
-
-extern size_t ipsec_hdrsiz(const struct mbuf *, u_int, struct inpcb *);
-extern size_t ipsec_hdrsiz_tcp(struct tcpcb *);
-
+struct m_tag;
+struct secasvar;
+struct sockopt;
+struct tcphdr;
 union sockaddr_union;
-extern char *ipsec_address(union sockaddr_union *, char *, socklen_t);
-extern char *ipsec_logsastr(struct secasvar *, char *, size_t);
 
-extern void ipsec_dumpmbuf(const struct mbuf *);
+int ipsec_if_input(struct mbuf *, struct secasvar *, uint32_t);
 
-struct m_tag;
-extern int ah4_input(struct mbuf **mp, int *offp, int proto);
-extern void ah4_ctlinput(int cmd, struct sockaddr *sa, void *);
-extern int esp4_input(struct mbuf **mp, int *offp, int proto);
-extern void esp4_ctlinput(int cmd, struct sockaddr *sa, void *);
-extern int ipcomp4_input(struct mbuf **mp, int *offp, int proto);
-extern int ipsec_common_input(struct mbuf *m, int, int, int, int); 
-extern int ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
-			int skip, int protoff);
-extern int ipsec4_process_packet(struct mbuf *, struct ipsecrequest *);
-extern int ipsec_process_done(struct mbuf *, struct ipsecrequest *);
+struct ipsecrequest *ipsec_newisr(void);
+void ipsec_delisr(struct ipsecrequest *);
+struct secpolicy *ipsec4_checkpolicy(const struct mbuf *, struct inpcb *,
+    int *);
+
+u_int ipsec_get_reqlevel(struct secpolicy *, u_int);
+
+void udp_ipsec_adjust_cksum(struct mbuf *, struct secasvar *, int, int);
+int udp_ipsec_output(struct mbuf *, struct secasvar *);
+int udp_ipsec_input(struct mbuf *, int, int);
+int udp_ipsec_pcbctl(struct inpcb *, struct sockopt *);
+
+int ipsec_chkreplay(uint32_t, struct secasvar *);
+int ipsec_updatereplay(uint32_t, struct secasvar *);
+int ipsec_updateid(struct secasvar *, uint64_t *, uint64_t *);
+int ipsec_initialized(void);
+
+void ipsec_setspidx_inpcb(struct inpcb *, struct secpolicyindex *, u_int);
+
+void ipsec4_setsockaddrs(const struct mbuf *, union sockaddr_union *,
+    union sockaddr_union *);
+int ipsec4_in_reject(const struct mbuf *, struct inpcb *);
+int ipsec4_input(struct mbuf *, int, int);
+int ipsec4_forward(struct mbuf *);
+int ipsec4_pcbctl(struct inpcb *, struct sockopt *);
+int ipsec4_output(struct mbuf *, struct inpcb *);
+int ipsec4_capability(struct mbuf *, u_int);
+int ipsec4_common_input_cb(struct mbuf *, struct secasvar *, int, int);
+int ipsec4_process_packet(struct mbuf *, struct secpolicy *, struct inpcb *);
+int ipsec_process_done(struct mbuf *, struct secpolicy *, struct secasvar *,
+    u_int);
 
 extern	void m_checkalignment(const char* where, struct mbuf *m0,
 		int off, int len);