aboutsummaryrefslogtreecommitdiff
path: root/sys/netinet/libalias/alias_pptp.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/netinet/libalias/alias_pptp.c')
-rw-r--r--sys/netinet/libalias/alias_pptp.c193
1 files changed, 167 insertions, 26 deletions
diff --git a/sys/netinet/libalias/alias_pptp.c b/sys/netinet/libalias/alias_pptp.c
index 0ce69a4718ce..b4fd9d0d438a 100644
--- a/sys/netinet/libalias/alias_pptp.c
+++ b/sys/netinet/libalias/alias_pptp.c
@@ -39,6 +39,169 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
+/* Includes */
+#ifdef _KERNEL
+#include <sys/param.h>
+#include <sys/limits.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#else
+#include <errno.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <stdio.h>
+#endif
+
+#include <netinet/tcp.h>
+
+#ifdef _KERNEL
+#include <netinet/libalias/alias.h>
+#include <netinet/libalias/alias_local.h>
+#include <netinet/libalias/alias_mod.h>
+#else
+#include "alias.h"
+#include "alias_local.h"
+#include "alias_mod.h"
+#endif
+
+#define PPTP_CONTROL_PORT_NUMBER 1723
+
+static void
+AliasHandlePptpOut(struct libalias *, struct ip *, struct alias_link *);
+
+static void
+AliasHandlePptpIn(struct libalias *, struct ip *, struct alias_link *);
+
+static int
+AliasHandlePptpGreOut(struct libalias *, struct ip *);
+
+static int
+AliasHandlePptpGreIn(struct libalias *, struct ip *);
+
+static int
+fingerprint(struct libalias *la, struct ip *pip, struct alias_data *ah)
+{
+
+ if (ah->dport == NULL || ah->sport == NULL || ah->lnk == NULL)
+ return (-1);
+ if (ntohs(*ah->dport) == PPTP_CONTROL_PORT_NUMBER
+ || ntohs(*ah->sport) == PPTP_CONTROL_PORT_NUMBER)
+ return (0);
+ return (-1);
+}
+
+static int
+fingerprintgre(struct libalias *la, struct ip *pip, struct alias_data *ah)
+{
+
+ return (0);
+}
+
+static int
+protohandlerin(struct libalias *la, struct ip *pip, struct alias_data *ah)
+{
+
+ AliasHandlePptpIn(la, pip, ah->lnk);
+ return (0);
+}
+
+static int
+protohandlerout(struct libalias *la, struct ip *pip, struct alias_data *ah)
+{
+
+ AliasHandlePptpOut(la, pip, ah->lnk);
+ return (0);
+}
+
+static int
+protohandlergrein(struct libalias *la, struct ip *pip, struct alias_data *ah)
+{
+
+ if (la->packetAliasMode & PKT_ALIAS_PROXY_ONLY ||
+ AliasHandlePptpGreIn(la, pip) == 0)
+ return (0);
+ return (-1);
+}
+
+static int
+protohandlergreout(struct libalias *la, struct ip *pip, struct alias_data *ah)
+{
+
+ if (AliasHandlePptpGreOut(la, pip) == 0)
+ return (0);
+ return (-1);
+}
+
+/* Kernel module definition. */
+struct proto_handler handlers[] = {
+ {
+ .pri = 200,
+ .dir = IN,
+ .proto = TCP,
+ .fingerprint = &fingerprint,
+ .protohandler = &protohandlerin
+ },
+ {
+ .pri = 210,
+ .dir = OUT,
+ .proto = TCP,
+ .fingerprint = &fingerprint,
+ .protohandler = &protohandlerout
+ },
+/*
+ * WATCH OUT!!! these 2 handlers NEED a priority of INT_MAX (highest possible)
+ * cause they will ALWAYS process packets, so they must be the last one
+ * in chain: look fingerprintgre() above.
+ */
+ {
+ .pri = INT_MAX,
+ .dir = IN,
+ .proto = IP,
+ .fingerprint = &fingerprintgre,
+ .protohandler = &protohandlergrein
+ },
+ {
+ .pri = INT_MAX,
+ .dir = OUT,
+ .proto = IP,
+ .fingerprint = &fingerprintgre,
+ .protohandler = &protohandlergreout
+ },
+ { EOH }
+};
+static int
+mod_handler(module_t mod, int type, void *data)
+{
+ int error;
+
+ switch (type) {
+ case MOD_LOAD:
+ error = 0;
+ LibAliasAttachHandlers(handlers);
+ break;
+ case MOD_UNLOAD:
+ error = 0;
+ LibAliasDetachHandlers(handlers);
+ break;
+ default:
+ error = EINVAL;
+ }
+ return (error);
+}
+
+#ifdef _KERNEL
+static
+#endif
+moduledata_t alias_mod = {
+ "alias_pptp", mod_handler, NULL
+};
+
+#ifdef _KERNEL
+DECLARE_MODULE(alias_pptp, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
+MODULE_VERSION(alias_pptp, 1);
+MODULE_DEPEND(alias_pptp, libalias, 1, 1, 1);
+#endif
+
/*
Alias_pptp.c performs special processing for PPTP sessions under TCP.
Specifically, watch PPTP control messages and alias the Call ID or the
@@ -65,26 +228,6 @@ __FBSDID("$FreeBSD$");
*/
-/* Includes */
-#ifdef _KERNEL
-#include <sys/param.h>
-#else
-#include <sys/types.h>
-#include <stdio.h>
-#endif
-
-#include <netinet/in_systm.h>
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <netinet/tcp.h>
-
-#ifdef _KERNEL
-#include <netinet/libalias/alias.h>
-#include <netinet/libalias/alias_local.h>
-#else
-#include "alias_local.h"
-#endif
-
/*
* PPTP definitions
*/
@@ -153,7 +296,7 @@ typedef struct pptpCallIds *PptpCallId;
static PptpCallId AliasVerifyPptp(struct ip *, u_int16_t *);
-void
+static void
AliasHandlePptpOut(struct libalias *la,
struct ip *pip, /* IP packet to examine/patch */
struct alias_link *lnk)
@@ -225,7 +368,7 @@ AliasHandlePptpOut(struct libalias *la,
}
}
-void
+static void
AliasHandlePptpIn(struct libalias *la,
struct ip *pip, /* IP packet to examine/patch */
struct alias_link *lnk)
@@ -328,8 +471,7 @@ AliasVerifyPptp(struct ip *pip, u_int16_t * ptype)
return (PptpCallId) (hptr + 1);
}
-
-int
+static int
AliasHandlePptpGreOut(struct libalias *la, struct ip *pip)
{
GreHdr *gr;
@@ -353,8 +495,7 @@ AliasHandlePptpGreOut(struct libalias *la, struct ip *pip)
return (0);
}
-
-int
+static int
AliasHandlePptpGreIn(struct libalias *la, struct ip *pip)
{
GreHdr *gr;