[XFRM]: Assorted IPsec fixups

This patch fixes a number of small but potentially troublesome things in the
XFRM/IPsec code:

 * Use the 'audit_enabled' variable already in include/linux/audit.h
   Removed the need for extern declarations local to each XFRM audit fuction

 * Convert 'sid' to 'secid' everywhere we can
   The 'sid' name is specific to SELinux, 'secid' is the common naming
   convention used by the kernel when refering to tokenized LSM labels,
   unfortunately we have to leave 'ctx_sid' in 'struct xfrm_sec_ctx' otherwise
   we risk breaking userspace

 * Convert address display to use standard NIP* macros
   Similar to what was recently done with the SPD audit code, this also also
   includes the removal of some unnecessary memcpy() calls

 * Move common code to xfrm_audit_common_stateinfo()
   Code consolidation from the "less is more" book on software development

 * Proper spacing around commas in function arguments
   Minor style tweak since I was already touching the code
Signed-off-by: Paul Moore <paul.moore@hp.com>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -565,7 +565,7 @@ struct xfrm_audit
 };
 
 #ifdef CONFIG_AUDITSYSCALL
-static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
+static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 secid)
 {
 	struct audit_buffer *audit_buf = NULL;
 	char *secctx;
@@ -578,8 +578,8 @@ static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
 
 	audit_log_format(audit_buf, "auid=%u", auid);
 
-	if (sid != 0 &&
-	    security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {
+	if (secid != 0 &&
+	    security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
 		audit_log_format(audit_buf, " subj=%s", secctx);
 		security_release_secctx(secctx, secctx_len);
 	} else
@@ -588,13 +588,13 @@ static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)
 }
 
 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
-				  u32 auid, u32 sid);
+				  u32 auid, u32 secid);
 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
-				  u32 auid, u32 sid);
+				  u32 auid, u32 secid);
 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
-				 u32 auid, u32 sid);
+				 u32 auid, u32 secid);
 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
-				    u32 auid, u32 sid);
+				    u32 auid, u32 secid);
 #else
 #define xfrm_audit_policy_add(x, r, a, s)	do { ; } while (0)
 #define xfrm_audit_policy_delete(x, r, a, s)	do { ; } while (0)

net/xfrm/xfrm_policy.c

@@ -24,6 +24,7 @@
 #include <linux/netfilter.h>
 #include <linux/module.h>
 #include <linux/cache.h>
+#include <linux/audit.h>
 #include <net/dst.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
@@ -2401,15 +2402,14 @@ static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
 	}
 }
 
-void
-xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
+void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
+			   u32 auid, u32 secid)
 {
 	struct audit_buffer *audit_buf;
-	extern int audit_enabled;
 
 	if (audit_enabled == 0)
 		return;
-	audit_buf = xfrm_audit_start(auid, sid);
+	audit_buf = xfrm_audit_start(auid, secid);
 	if (audit_buf == NULL)
 		return;
 	audit_log_format(audit_buf, " op=SPD-add res=%u", result);
@@ -2418,15 +2418,14 @@ xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
 }
 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
 
-void
-xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, u32 auid, u32 sid)
+void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
+			      u32 auid, u32 secid)
 {
 	struct audit_buffer *audit_buf;
-	extern int audit_enabled;
 
 	if (audit_enabled == 0)
 		return;
-	audit_buf = xfrm_audit_start(auid, sid);
+	audit_buf = xfrm_audit_start(auid, secid);
 	if (audit_buf == NULL)
 		return;
 	audit_log_format(audit_buf, " op=SPD-delete res=%u", result);

net/xfrm/xfrm_state.c

@@ -19,6 +19,7 @@
 #include <linux/ipsec.h>
 #include <linux/module.h>
 #include <linux/cache.h>
+#include <linux/audit.h>
 #include <asm/uaccess.h>
 
 #include "xfrm_hash.h"
@@ -1998,69 +1999,59 @@ void __init xfrm_state_init(void)
 static inline void xfrm_audit_common_stateinfo(struct xfrm_state *x,
 					       struct audit_buffer *audit_buf)
 {
-	if (x->security)
+	struct xfrm_sec_ctx *ctx = x->security;
+	u32 spi = ntohl(x->id.spi);
+
+	if (ctx)
 		audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
-				 x->security->ctx_alg, x->security->ctx_doi,
-				 x->security->ctx_str);
+				 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
 
 	switch(x->props.family) {
 	case AF_INET:
-		audit_log_format(audit_buf, " src=%u.%u.%u.%u dst=%u.%u.%u.%u",
+		audit_log_format(audit_buf,
+				 " src=" NIPQUAD_FMT " dst=" NIPQUAD_FMT,
 				 NIPQUAD(x->props.saddr.a4),
 				 NIPQUAD(x->id.daddr.a4));
 		break;
 	case AF_INET6:
-		{
-			struct in6_addr saddr6, daddr6;
-
-			memcpy(&saddr6, x->props.saddr.a6,
-				sizeof(struct in6_addr));
-			memcpy(&daddr6, x->id.daddr.a6,
-				sizeof(struct in6_addr));
 		audit_log_format(audit_buf,
 				 " src=" NIP6_FMT " dst=" NIP6_FMT,
-					 NIP6(saddr6), NIP6(daddr6));
-		}
+				 NIP6(*(struct in6_addr *)x->props.saddr.a6),
+				 NIP6(*(struct in6_addr *)x->id.daddr.a6));
 		break;
 	}
+
+	audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
 }
 
-void
-xfrm_audit_state_add(struct xfrm_state *x, int result, u32 auid, u32 sid)
+void xfrm_audit_state_add(struct xfrm_state *x, int result,
+			  u32 auid, u32 secid)
 {
 	struct audit_buffer *audit_buf;
-	u32 spi;
-	extern int audit_enabled;
 
 	if (audit_enabled == 0)
 		return;
-	audit_buf = xfrm_audit_start(auid, sid);
+	audit_buf = xfrm_audit_start(auid, secid);
 	if (audit_buf == NULL)
 		return;
-	audit_log_format(audit_buf, " op=SAD-add res=%u",result);
+	audit_log_format(audit_buf, " op=SAD-add res=%u", result);
 	xfrm_audit_common_stateinfo(x, audit_buf);
-	spi = ntohl(x->id.spi);
-	audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
 	audit_log_end(audit_buf);
 }
 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
 
-void
-xfrm_audit_state_delete(struct xfrm_state *x, int result, u32 auid, u32 sid)
+void xfrm_audit_state_delete(struct xfrm_state *x, int result,
+			     u32 auid, u32 secid)
 {
 	struct audit_buffer *audit_buf;
-	u32 spi;
-	extern int audit_enabled;
 
 	if (audit_enabled == 0)
 		return;
-	audit_buf = xfrm_audit_start(auid, sid);
+	audit_buf = xfrm_audit_start(auid, secid);
 	if (audit_buf == NULL)
 		return;
-	audit_log_format(audit_buf, " op=SAD-delete res=%u",result);
+	audit_log_format(audit_buf, " op=SAD-delete res=%u", result);
 	xfrm_audit_common_stateinfo(x, audit_buf);
-	spi = ntohl(x->id.spi);
-	audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
 	audit_log_end(audit_buf);
 }
 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);