New option retrieve-vlan (experimental)

CHANGES

@@ -57,6 +57,15 @@ Features:
 	messages in LISTEN and CONNECT type sub processes.
 	Test: CHILDREN_SHUTUP
 
+	New option retrieve-vlan for supporting VLANs in INTERFACE addresses:
+	Linux normally keeps VLAN tags in outgoing raw packets, but appears to
+	strip them from incoming packets and makes them available in
+	PACKET_AUXDATA ancillary messages only.
+	Up do version 1.7.4.5 Socat did not handle this situation, so the VLAN
+	tags where effectively stripped off incoming packets.
+	With this option Socat restores the VLAN tag.
+	Feature inspired by Zhao Dong.
+
 Corrections:
 	When a sub process (EXEC, SYSTEM) terminated with exit code other than
 	0, its last sent data might have been lost depending on timing of read/

VERSION

@@ -1 +1 @@
-"1.7.4.5+vlans"
+"1.7.4.5+"

config.h.in

@@ -430,6 +430,12 @@
 /* define if you have struct in6_pktinfo */
 #undef HAVE_STRUCT_IN6_PKTINFO
 
+/* define if you have struct tpacket_auxdata */
+#undef HAVE_STRUCT_TPACKET_AUXDATA
+
+/* define if you have struct tpacket_auxdata and it has tp_vlan_tpid */
+#undef HAVE_STRUCT_TPACKET_AUXDATA_TP_VLAN_TPID
+
 /* define if your struct ip has ip_hl; otherwise assume ip_vhl */
 #undef HAVE_STRUCT_IP_IP_HL
 

configure.ac

@@ -1477,6 +1477,29 @@ if test $sc_cv_struct_in6_pktinfo = yes; then
 fi
 AC_MSG_RESULT($sc_cv_struct_in6_pktinfo)
 
+dnl check for struct tpacket_auxdata
+AC_MSG_CHECKING(for struct tpacket_auxdata)
+AC_CACHE_VAL(sc_cv_struct_tpacket_auxdata,
+[AC_TRY_COMPILE([#include "sysincludes.h"],
+[struct tpacket_auxdata s;],
+[sc_cv_struct_tpacket_auxdata=yes],
+[sc_cv_struct_tpacket_auxdata=no])])
+if test $sc_cv_struct_tpacket_auxdata = yes; then
+   AC_DEFINE(HAVE_STRUCT_TPACKET_AUXDATA)
+fi
+AC_MSG_RESULT($sc_cv_struct_tpacket_auxdata)
+
+AC_MSG_CHECKING(for tp_vlan_tpid in struct tpacket_auxdata)
+AC_CACHE_VAL(sc_cv_struct_tpacket_auxdata_tp_vlan_tpid,
+[AC_TRY_COMPILE([#include "sysincludes.h"],
+[struct tpacket_auxdata s; s.tp_vlan_tpid=0],
+[sc_cv_struct_tpacket_auxdata_tp_vlan_tpid=yes],
+[sc_cv_struct_tpacket_auxdata_tp_vlan_tpid=no])])
+if test $sc_cv_struct_tpacket_auxdata_tp_vlan_tpid = yes; then
+   AC_DEFINE(HAVE_STRUCT_TPACKET_AUXDATA_TP_VLAN_TPID)
+fi
+AC_MSG_RESULT($sc_cv_struct_tpacket_auxdata)
+
 dnl check for ip_hl in struct ip
 AC_MSG_CHECKING(for struct ip.ip_hl)
 AC_CACHE_VAL(sc_cv_struct_ip_ip_hl,

doc/socat.yo

@@ -3004,9 +3004,20 @@ startdit()enddit()nl()
 
 label(GROUP_INTERFACE)em(bf(INTERFACE option group))
 
-Options that control Linux INTERFACE addresses.
+These options may be applied to addresses link(INTERFACE)(ADDRESS_INTERFACE) and
+link(TUN)(ADDRESS_TUN). These address types and options are currently only
+implemented on Linux operating system.
+
+Note regarding VLANs: On incoming packets the Linux kernel strips off the VLAN
+tag before passing the data to the user space program on raw sockets. Special
+measures are required to get the VLAN information, see NOEXPAND(packet(7)) PACKET_AUXDATA,
+and to optionally insert the tag into the packet again, use option
+link(retrieve-vlan)(OPTION_RETRIEVE_VLAN) when you need this.
+
+label(OPTION_RETRIEVE_VLAN)dit(bf(tt(retrieve-vlan)))
+   On packets incoming on raw sockets, retrieve the VLAN information and insert
+   it into the packets for further processing (Linux)
 
-startdit()
 label(OPTION_IFF_UP)dit(bf(tt(iff-up)))
    Sets the TUN network interface status UP. Strongly recommended.
 label(OPTION_IFF_BROADCAST)dit(bf(tt(iff-broadcast)))

xio-interface.c

@@ -10,6 +10,7 @@
 
 #include "xioopen.h"
 #include "xio-socket.h"
+#include "xio-ascii.h"
 
 #include "xio-interface.h"
 
@@ -45,6 +46,9 @@ const struct optdesc opt_iff_portsel     = { "iff-portsel",     "portsel",     O
 const struct optdesc opt_iff_automedia   = { "iff-automedia",   "automedia",   OPT_IFF_AUTOMEDIA,   GROUP_INTERFACE, PH_FD,   TYPE_BOOL,     OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(para.interface.iff_opts), IFF_AUTOMEDIA };
 #endif
 /*const struct optdesc opt_iff_dynamic   = { "iff-dynamic",     "dynamic",     OPT_IFF_DYNAMIC,     GROUP_INTERFACE, PH_FD,   TYPE_BOOL,     OFUNC_OFFSET_MASKS, XIO_OFFSETOF(para.interface.iff_opts), XIO_SIZEOF(short), IFF_DYNAMIC };*/
+#ifdef PACKET_AUXDATA
+const struct optdesc opt_retrieve_vlan   = { "retrieve-vlan",   NULL,          OPT_RETRIEVE_VLAN,   GROUP_INTERFACE, PH_LATE, TYPE_INT,      OFUNC_SPEC };
+#endif
 #if LATER
 const struct optdesc opt_route           = { "route",           NULL,          OPT_ROUTE,           GROUP_INTERFACE, PH_INIT, TYPE_STRING,   OFUNC_SPEC };
 #endif
@@ -122,6 +126,23 @@ int _xioopen_interface(const char *ifname,
    return 0;
 }
 
+int _interface_setsockopt_auxdata(int fd, int auxdata) {
+#ifdef PACKET_AUXDATA
+   /* Linux strips VLAN tag off incoming packets and makes it available per
+      ancillary data as auxdata. Apply option packet-auxdata if you want the
+      VLAN tag to be restored by Socat in the received packet */
+   if (auxdata) {
+      int rc;
+      rc = Setsockopt(fd, SOL_PACKET, PACKET_AUXDATA, &auxdata, sizeof(auxdata));
+      if (rc < 0) {
+	 Error3("setsockopt(%d, SOL_PACKET, PACKET_AUXDATA, , {%d}): %s",
+		fd, auxdata, strerror(errno));
+      }
+   }
+#endif /* defined(PACKET_AUXDATA) */
+   return 0;
+}
+
 static
 int xioopen_interface(int argc, const char *argv[], struct opt *opts,
 		      int xioflags, xiofile_t *xxfd, groups_t groups,
@@ -228,4 +249,69 @@ int _xiointerface_apply_iff(
    return 0;
 }
 
+
+#if HAVE_STRUCT_CMSGHDR && HAVE_STRUCT_TPACKET_AUXDATA
+/* Converts the ancillary message in *cmsg into a form useable for further
+   processing. Knows the specifics of common message types.
+   On PACKET_AUXDATA it stored the ancillary data in the XFD.
+   For other types:
+   returns the number of resulting syntax elements in *num,
+   returns a sequence of \0 terminated type strings in *typbuff,
+   returns a sequence of \0 terminated name strings in *nambuff,
+   returns a sequence of \0 terminated value strings in *valbuff,
+   the respective len parameters specify the available space in the buffers
+   returns STAT_OK or other STAT_*
+ */
+int
+xiolog_ancillary_packet(struct single *sfd,
+			struct cmsghdr *cmsg, int *num,
+			char *typbuff, int typlen,
+			char *nambuff, int namlen,
+			char *envbuff, int envlen,
+			char *valbuff, int vallen) {
+#if LATER
+   const char *cmsgtype, *cmsgname, *cmsgenvn;
+   size_t msglen;
+#endif
+   struct tpacket_auxdata *auxp;
+   int rc = STAT_OK;
+
+   *num = 0;
+
+#if defined(CMSG_DATA)
+
+#if LATER
+   msglen = cmsg->cmsg_len-((char *)CMSG_DATA(cmsg)-(char *)cmsg);
+#endif
+   switch (cmsg->cmsg_type) {
+#if HAVE_STRUCT_TPACKET_AUXDATA_TP_VLAN_TPID
+   case PACKET_AUXDATA:
+#if LATER
+      cmsgname = "packet_auxdata";
+      cmsgtype = "auxdata";
+      cmsgenvn = "AUXDATA";
+#endif
+      auxp = (struct tpacket_auxdata *)CMSG_DATA(cmsg);
+      Info8("%s(): Ancillary message: PACKET_AUXDATA: status="F_uint32_t", len="F_uint32_t", snaplen="F_uint32_t", mac="F_uint16_t", net="F_uint16_t", vlan_tci="F_uint16_t", vlan_tpid="F_uint16_t"", __func__, auxp->tp_status, auxp->tp_len, auxp->tp_snaplen, auxp->tp_mac, auxp->tp_net, auxp->tp_vlan_tci, auxp->tp_vlan_tpid);
+      sfd->para.socket.ancill_data_packet_auxdata = *auxp;
+      sfd->para.socket.ancill_flag.packet_auxdata = 1;
+      snprintf(typbuff, typlen, "PACKET.%u", cmsg->cmsg_type);
+      nambuff[0] = '\0'; strncat(nambuff, "vlan", namlen-1);
+      snprintf(strchr(valbuff, '\0')-1/*def \n*/, vallen-strlen(valbuff)+1, ", %d", auxp->tp_vlan_tci);
+      break;
+#endif /* HAVE_STRUCT_TPACKET_AUXDATA_TP_VLAN_TPID */
+   default:	/* binary data */
+      Warn1("xiolog_ancillary_packet(): INTERNAL: cmsg_type=%d not handled", cmsg->cmsg_type);
+      return rc;
+   }
+   return rc;
+
+#else /* !defined(CMSG_DATA) */
+
+   return STAT_NORETRY;
+
+#endif /* !defined(CMSG_DATA) */
+}
+#endif /* HAVE_STRUCT_CMSGHDR && HAVE_STRUCT_TPACKET_AUXDATA */
+
 #endif /* _WITH_INTERFACE */

xio-interface.h

@@ -25,11 +25,13 @@ extern const struct optdesc opt_iff_multicast;
 extern const struct optdesc opt_iff_portsel;
 extern const struct optdesc opt_iff_automedia;
 /*extern const struct optdesc opt_iff_dynamic;*/
+extern const struct optdesc opt_retrieve_vlan;
 
 extern int xiolog_ancillary_packet(struct single *sfd, struct cmsghdr *cmsg, int *num, char *typbuff, int typlen, char *nambuff, int namlen, char *envbuff, int envlen, char *valbuff, int vallen);
 
 extern int _xiointerface_get_iff(int sockfd, const char *name, short *save_iff);
 extern int _xiointerface_set_iff(int sockfd, const char *name, 	short new_iff);
 extern int _xiointerface_apply_iff(int sockfd, const char *name, short iff_opts[2]);
+extern int _interface_setsockopt_auxdata(int fd, int auxdata);
 
 #endif /* !defined(__xio_interface_h_included) */

xio-ip.c

@@ -475,11 +475,15 @@ int xiogetaddrinfo(const char *node, const char *service,
    Returns STAT_OK on success
    Returns STAT_WARNING if a buffer was too short and data truncated.
  */
-int xiolog_ancillary_ip(struct cmsghdr *cmsg, int *num,
+int xiolog_ancillary_ip(
-			char *typbuff, int typlen,
+	struct single *sfd,
-			char *nambuff, int namlen,
+	struct cmsghdr *cmsg,
-			char *envbuff, int envlen,
+	int *num,
-			char *valbuff, int vallen) {
+	char *typbuff, int typlen,
+	char *nambuff, int namlen,
+	char *envbuff, int envlen,
+	char *valbuff, int vallen)
+{
    int cmsgctr = 0;
    const char *cmsgtype, *cmsgname = NULL, *cmsgenvn = NULL;
    size_t msglen;

xio-ip.h

@@ -43,12 +43,7 @@ extern int xiogetaddrinfo(const char *node, const char *service,
 			  int family, int socktype, int protocol,
 			  union sockaddr_union *sa, socklen_t *socklen,
 			  unsigned long res_opts0, unsigned long res_opts1);
-extern
+extern int xiolog_ancillary_ip(struct single *sfd, struct cmsghdr *cmsg, int *num, char *typbuff, int typlen, char *nambuff, int namlen, char *envbuff, int envlen, char *valbuff, int vallen);
-int xiolog_ancillary_ip(struct cmsghdr *cmsg, int *num,
-			char *typbuff, int typlen,
-			char *nambuff, int namlen,
-			char *envbuff, int envlen,
-			char *valbuff, int vallen);
 extern int xiotype_ip_add_membership(char *token, const struct optname *ent, struct opt *opt);
 extern int xioapply_ip_add_membership(xiosingle_t *xfd, struct opt *opt);
 extern int xiotype_ip_add_source_membership(char* token, const struct optname *ent, struct opt *opt);

xio-ip6.c

@@ -252,11 +252,15 @@ int xiocheckrange_ip6(struct sockaddr_in6 *pa, struct xiorange *range) {
    the respective len parameters specify the available space in the buffers
    returns STAT_OK on success
  */
-int xiolog_ancillary_ip6(struct cmsghdr *cmsg, int *num,
+int xiolog_ancillary_ip6(
-			 char *typbuff, int typlen,
+	struct single *xfd,
-			 char *nambuff, int namlen,
+	struct cmsghdr *cmsg,
-			 char *envbuff, int envlen,
+	int *num,
-			 char *valbuff, int vallen) {
+	char *typbuff, int typlen,
+	char *nambuff, int namlen,
+	char *envbuff, int envlen,
+	char *valbuff, int vallen)
+{
    char scratch1[42];	/* can hold an IPv6 address in ASCII */
    char scratch2[32];
    size_t msglen;

xio-ip6.h

@@ -40,11 +40,7 @@ extern int xiorange_ip6andmask(struct xiorange *range);
 extern
 int xiocheckrange_ip6(struct sockaddr_in6 *pa, struct xiorange *range);
 extern
-int xiolog_ancillary_ip6(struct cmsghdr *cmsg, int *num,
+int xiolog_ancillary_ip6(struct single *sfd, struct cmsghdr *cmsg, int *num, char *typbuff, int typlen, char *nambuff, int namlen, char *envbuff, int envlen, char *valbuff, int vallen);
-			 char *typbuff, int typlen,
-			 char *nambuff, int namlen,
-			 char *envbuff, int envlen,
-			 char *valbuff, int vallen);
 extern int
 xiosetsockaddrenv_ip6(int idx, char *namebuff, size_t namelen,
 		      char *valuebuff, size_t valuelen,

xio-ipapp.c

@@ -110,7 +110,7 @@ int xioopen_ipapp_connect(int argc, const char *argv[], struct opt *opts,
 	    level = E_WARN;	/* most users won't expect a problem here,
 				   so Notice is too weak */
 	 }
-	 while ((pid = xio_fork(false, level, xfd->para.socket.shutup)) < 0) {
+	 while ((pid = xio_fork(false, level, xfd->shutup)) < 0) {
 	    if (xfd->forever || --xfd->retry) {
 	       Nanosleep(&xfd->intervall, NULL); continue;
 	    }

xio-listen.c

@@ -20,7 +20,7 @@
 const struct optdesc opt_backlog = { "backlog",   NULL, OPT_BACKLOG,     GROUP_LISTEN, PH_LISTEN, TYPE_INT,    OFUNC_SPEC };
 const struct optdesc opt_fork    = { "fork",      NULL, OPT_FORK,        GROUP_CHILD,   PH_PASTACCEPT, TYPE_BOOL,  OFUNC_SPEC };
 const struct optdesc opt_max_children = { "max-children", NULL, OPT_MAX_CHILDREN, GROUP_CHILD,   PH_PASTACCEPT, TYPE_INT,  OFUNC_SPEC };
-const struct optdesc opt_children_shutup = { "children-shutup", "child-shutup", OPT_CHILDREN_SHUTUP, GROUP_CHILD, PH_PASTACCEPT, TYPE_INT, OFUNC_OFFSET, XIO_OFFSETOF(para.socket.shutup) };
+const struct optdesc opt_children_shutup = { "children-shutup", "child-shutup", OPT_CHILDREN_SHUTUP, GROUP_CHILD, PH_PASTACCEPT, TYPE_INT, OFUNC_OFFSET, XIO_OFFSETOF(shutup) };
 /**/
 #if (WITH_UDP || WITH_TCP)
 const struct optdesc opt_range   = { "range",     NULL, OPT_RANGE,       GROUP_RANGE,  PH_ACCEPT, TYPE_STRING, OFUNC_SPEC };
@@ -346,7 +346,7 @@ int _xioopen_listen(struct single *xfd, int xioflags, struct sockaddr *us, sockl
 
 	 if ((pid =
 	      xio_fork(false, level==E_ERROR?level:E_WARN,
-		       xfd->para.socket.shutup))
+		       xfd->shutup))
 	     < 0) {
 	    Close(xfd->fd);
 	    Sigprocmask(SIG_UNBLOCK, &mask_sigchld, NULL);

xio-openssl.c

@@ -409,7 +409,7 @@ static int
 	 if (xfd->forever || xfd->retry) {
 	    level = E_WARN;
 	 }
-	 while ((pid = xio_fork(false, level, xfd->para.socket.shutup)) < 0) {
+	 while ((pid = xio_fork(false, level, xfd->shutup)) < 0) {
 	    if (xfd->forever || --xfd->retry) {
 	       Nanosleep(&xfd->intervall, NULL); continue;
 	    }

xio-proxy.c

@@ -199,7 +199,7 @@ static int xioopen_proxy_connect(int argc, const char *argv[], struct opt *opts,
 	 if (xfd->forever || xfd->retry) {
 	    level = E_WARN;
 	 }
-	 while ((pid = xio_fork(false, level, xfd->para.socket.shutup)) < 0) {
+	 while ((pid = xio_fork(false, level, xfd->shutup)) < 0) {
 	    if (xfd->forever || --xfd->retry) {
 	       Nanosleep(&xfd->intervall, NULL); continue;
 	    }

xio-socket.c

@@ -62,7 +62,7 @@ int _xioopen_socket_sendto(const char *pfname, const char *type,
 			   groups_t groups);
 
 static int
-xiolog_ancillary_socket(struct cmsghdr *cmsg, int *num,
+xiolog_ancillary_socket(struct single *sfd, struct cmsghdr *cmsg, int *num,
 			char *typbuff, int typlen,
 			char *nambuff, int namlen,
 			char *envbuff, int envlen,
@@ -713,7 +713,7 @@ int xioopen_socket_datagram(int argc, const char *argv[], struct opt *opts,
 #endif /* WITH_GENERICSOCKET */
 
 /* EINTR not handled specially */
-int xiogetpacketinfo(int fd)
+int xiogetpacketinfo(struct single *sfd, int fd)
 {
 #if defined(MSG_ERRQUEUE)
    int _errno = errno;
@@ -748,7 +748,7 @@ int xiogetpacketinfo(int fd)
 	      sockaddr_info(&pa->soa, palen, peername, sizeof(peername))/*,
 									  sockaddr_info(&la->soa, sockname, sizeof(sockname))*/);
 
-      xiodopacketinfo(&msgh, true, true);
+      xiodopacketinfo(sfd, &msgh, true, true);
    }
    errno = _errno;
 #endif /* defined(MSG_ERRQUEUE) */
@@ -898,7 +898,7 @@ int _xioopen_connect(struct single *xfd, union sockaddr_union *us, size_t uslen,
 	 return STAT_RETRYLATER;
       } else {
 	 /* try to find details about error, especially from ICMP */
-	 xiogetpacketinfo(xfd->fd);
+	 xiogetpacketinfo(xfd, xfd->fd);
 
 	 /* continue mainstream */
 	 Msg4(level, "connect(%d, %s, "F_Zd"): %s",
@@ -994,7 +994,7 @@ int xioopen_connect(struct single *xfd, union sockaddr_union *us, size_t uslen,
 				   so Notice is too weak */
 	 }
 
-	 while ((pid = xio_fork(false, level, xfd->para.socket.shutup)) < 0) {
+	 while ((pid = xio_fork(false, level, xfd->shutup)) < 0) {
 	    --xfd->retry;
 	    if (xfd->forever || xfd->retry) {
 	       dropopts(opts, PH_ALL); opts = copyopts(opts0, GROUP_ALL);
@@ -1079,7 +1079,7 @@ int _xioopen_dgram_sendto(/* them is already in xfd->peersa */
       applyopts_named(us->un.sun_path, opts, PH_LATE);
    }
 #endif
-   /*applyopts(xfd->fd, opts, PH_LATE);*/
+   /*0 applyopts(xfd->fd, opts, PH_LATE); */
 
    /* xfd->dtype = DATA_RECVFROM; *//* no, the caller must set this (ev _SKIPIP) */
    Notice1("successfully prepared local socket %s",
@@ -1260,7 +1260,7 @@ int _xioopen_dgram_recvfrom(struct single *xfd, int xioflags,
 	      sockaddr_info(&pa->soa, palen, peername, sizeof(peername))/*,
 							     sockaddr_info(&la->soa, sockname, sizeof(sockname))*/);
 
-      xiodopacketinfo(&msgh, true, true);
+      xiodopacketinfo(xfd, &msgh, true, true);
 
       if (xiocheckpeer(xfd, pa, la) < 0) {
 	 /* drop packet */
@@ -1289,7 +1289,7 @@ int _xioopen_dgram_recvfrom(struct single *xfd, int xioflags,
 	    Error1("socketpair(PF_UNIX, SOCK_STREAM, 0, ...): %s", strerror(errno));
 	 }
 
-	 if ((pid = xio_fork(false, level, xfd->para.socket.shutup)) < 0) {
+	 if ((pid = xio_fork(false, level, xfd->shutup)) < 0) {
 	    Close(trigger[0]);
 	    Close(trigger[1]);
 	    Close(xfd->fd);
@@ -1461,7 +1461,12 @@ int xiogetancillary(int fd, struct msghdr *msgh, int flags) {
    and logs the relevant information (E_DEBUG, E_INFO).
    calls protocol/layer specific functions for handling the messages
    creates appropriate environment vars if withenv is set */
-int xiodopacketinfo(struct msghdr *msgh, bool withlog, bool withenv) {
+int xiodopacketinfo(
+	struct single *sfd,
+	struct msghdr *msgh,
+	bool withlog,
+	bool withenv)
+{
 #if defined(HAVE_STRUCT_CMSGHDR) && defined(CMSG_DATA)
    struct cmsghdr *cmsg;
 
@@ -1490,14 +1495,14 @@ int xiodopacketinfo(struct msghdr *msgh, bool withlog, bool withenv) {
 	 dependent */
       switch (cmsg->cmsg_level) {
       case SOL_SOCKET:
-	 xiolog_ancillary_socket(cmsg, &num, typbuff, sizeof(typbuff)-1,
+	 xiolog_ancillary_socket(sfd, cmsg, &num, typbuff, sizeof(typbuff)-1,
 				 nambuff, sizeof(nambuff)-1,
 				 envbuff, sizeof(envbuff)-1,
 				 valbuff, sizeof(valbuff)-1);
 	 break;
 #if WITH_IP4 || WITH_IP6
       case SOL_IP:
-	 xiolog_ancillary_ip(cmsg, &num, typbuff, sizeof(typbuff)-1,
+	 xiolog_ancillary_ip(sfd, cmsg, &num, typbuff, sizeof(typbuff)-1,
 			     nambuff, sizeof(nambuff)-1,
 			     envbuff, sizeof(envbuff)-1,
 			     valbuff, sizeof(valbuff)-1);
@@ -1505,12 +1510,20 @@ int xiodopacketinfo(struct msghdr *msgh, bool withlog, bool withenv) {
 #endif /* WITH_IP4 || WITH_IP6 */
 #if WITH_IP6
       case SOL_IPV6:
-	 xiolog_ancillary_ip6(cmsg, &num, typbuff, sizeof(typbuff)-1,
+	 xiolog_ancillary_ip6(sfd, cmsg, &num, typbuff, sizeof(typbuff)-1,
 			      nambuff, sizeof(nambuff)-1,
 			      envbuff, sizeof(envbuff)-1,
 			      valbuff, sizeof(valbuff)-1);
 	 break;
 #endif /* WITH_IP6 */
+#if HAVE_STRUCT_CMSGHDR && HAVE_STRUCT_TPACKET_AUXDATA
+      case SOL_PACKET:
+	 xiolog_ancillary_packet(sfd, cmsg, &num, typbuff, sizeof(typbuff)-1,
+			      nambuff, sizeof(nambuff)-1,
+			      envbuff, sizeof(envbuff)-1,
+			      valbuff, sizeof(valbuff)-1);
+	 break;
+#endif /* HAVE_STRUCT_CMSGHDR && HAVE_STRUCT_TPACKET_AUXDATA */
       default:
 	 num = 1;
 	 snprintf(typbuff, sizeof(typbuff)-1, "LEVEL%u", cmsg->cmsg_level);
@@ -1680,11 +1693,15 @@ int xiocheckpeer(xiosingle_t *xfd,
    returns STAT_OK or other STAT_*
  */
 static int
-xiolog_ancillary_socket(struct cmsghdr *cmsg, int *num,
+xiolog_ancillary_socket(
-			char *typbuff, int typlen,
+	struct single *sfd,
-			char *nambuff, int namlen,
+	struct cmsghdr *cmsg,
-			char *envbuff, int envlen,
+	int *num,
-			char *valbuff, int vallen) {
+	char *typbuff, int typlen,
+	char *nambuff, int namlen,
+	char *envbuff, int envlen,
+	char *valbuff, int vallen)
+{
    const char *cmsgtype, *cmsgname, *cmsgenvn;
    size_t msglen;
    struct timeval *tv;

xio-socket.h

@@ -116,8 +116,7 @@ int _xioopen_dgram_recv(struct single *xfd, int xioflags,
 			struct sockaddr *us, socklen_t uslen,
 			struct opt *opts, int pf, int socktype, int proto,
 			int level);
-extern
+extern int xiodopacketinfo(struct single *sfd, struct msghdr *msgh, bool withlog, bool withenv);
-int xiodopacketinfo(struct msghdr *msgh, bool withlog, bool withenv);
 extern
 int xiogetpacketsrc(int fd, struct msghdr *msgh, int flags);
 extern

xio-socks.c

@@ -175,7 +175,7 @@ static int xioopen_socks4_connect(int argc, const char *argv[], struct opt *opts
 	    level = E_WARN;	/* most users won't expect a problem here,
 				   so Notice is too weak */
 	 }
-	 while ((pid = xio_fork(false, level, xfd->para.socket.shutup)) < 0) {
+	 while ((pid = xio_fork(false, level, xfd->shutup)) < 0) {
 	    if (xfd->forever || --xfd->retry) {
 	       Nanosleep(&xfd->intervall, NULL);
 	       continue;

xio-udp.c

@@ -214,7 +214,7 @@ int _xioopen_ipdgram_listen(struct single *sfd,
 	    sockaddr_info(&them->soa, themlen, infobuff, sizeof(infobuff)));
 
       if (dofork) {
-	 pid = xio_fork(false, E_ERROR, sfd->para.socket.shutup);
+	 pid = xio_fork(false, E_ERROR, sfd->shutup);
 	 if (pid < 0) {
 	    return STAT_RETRYLATER;
 	 }

xio-unix.c

@@ -315,7 +315,7 @@ static int xioopen_unix_connect(int argc, const char *argv[], struct opt *opts,
 				   so Notice is too weak */
 	 }
 
-	 while ((pid = xio_fork(false, level, xfd->para.socket.shutup)) < 0) {
+	 while ((pid = xio_fork(false, level, xfd->shutup)) < 0) {
 	    --xfd->retry;
 	    if (xfd->forever || xfd->retry) {
 	       dropopts(opts, PH_ALL); opts = copyopts(opts0, GROUP_ALL);

xio.h

@@ -206,6 +206,7 @@ typedef struct single {
    int (*sigchild)(struct single *);	/* callback after sigchild */
    int escape;			/* escape character; -1 for no escape */
    bool actescape;		/* escape character found in input data */
+   int 	shutup; 		/* children-shutup option */
    union {
       struct {
 	 int fdout;		/* use fd for output */
@@ -224,8 +225,14 @@ typedef struct single {
 #if _WITH_IP4 || _WITH_IP6
 	 struct para_ip ip;
 #endif /* _WITH_IP4 || _WITH_IP6 */
-	 int 		 shutup;
+#if HAVE_STRUCT_TPACKET_AUXDATA
-	 /* up to here, keep consistent copy in openssl part !!! */
+	 struct {
+	    int     packet_auxdata;
+	 } ancill_flag;
+#endif
+#if HAVE_STRUCT_TPACKET_AUXDATA
+	 struct tpacket_auxdata ancill_data_packet_auxdata;
+#endif
 #if WITH_UNIX
 	 struct {
 	    bool     tight;
@@ -265,7 +272,6 @@ typedef struct single {
 #if _WITH_IP4 || _WITH_IP6
 	 struct para_ip ip;
 #endif /* _WITH_IP4 || _WITH_IP6 */
-	 int 		 shutup;
 	 /* end of the para.socket structure copy */
 	 SSL_CTX* ctx; 	/* for freeing on close */
 	 SSL *ssl;

xioopts.c

@@ -1397,6 +1397,9 @@ const struct optname optionnames[] = {
 	IF_PROXY  ("resolve",	&opt_proxy_resolve)
 #ifdef IP_RETOPTS
 	IF_IP     ("retopts",	&opt_ip_retopts)
+#endif
+#if WITH_INTERFACE && defined(PACKET_AUXDATA)
+	IF_SOCKET ("retrieve-vlan", 		&opt_retrieve_vlan)
 #endif
 	IF_RETRY  ("retry",	&opt_retry)
 	IF_SOCKET ("reuseaddr",	&opt_so_reuseaddr)
@@ -3710,6 +3713,17 @@ int applyopts(int fd, struct opt *opts, enum e_phase phase) {
 	    }
 	    break;
 
+#if _WITH_INTERFACE
+	 case OPT_RETRIEVE_VLAN:
+	    if (!xioparms.experimental) {
+	       Warn("option retrieve-vlan is experimental");
+	    }
+	    if (_interface_setsockopt_auxdata(fd, 1) < 0) {
+	       return -1;
+	    }
+	    break;
+#endif /* _WITH_INTERFACE */
+
 	 default: Error1("applyopts(): option \"%s\" not implemented",
 			 opt->desc->defname);
 	    opt->desc = ODESC_ERROR; ++opt; continue;

xioopts.h

@@ -614,6 +614,7 @@ enum e_optcode {
    OPT_RES_RECURSE,	/* resolver(3) */
    OPT_RES_STAYOPEN,	/* resolver(3) */
    OPT_RES_USEVC,	/* resolver(3) */
+   OPT_RETRIEVE_VLAN, 	/* Linux: get VLAN info on raw sockets per auxdata */
    OPT_RETRY,
    OPT_SANE,		/* termios */
    OPT_SCTP_MAXSEG,

xioread.c

@@ -198,6 +198,28 @@ ssize_t xioread(xiofile_t *file, void *buff, size_t bufsiz) {
       }
 #endif /* defined(PF_PACKET) && !defined(PACKET_IGNORE_OUTGOING) && defined(PACKET_OUTGOING) */
 
+#if defined(PF_PACKET) && HAVE_STRUCT_TPACKET_AUXDATA
+      if (from.soa.sa_family == PF_PACKET) {
+	 Debug3("xioread(FD=%d, ...): auxdata: flag=%d, vlan-id=%d",
+		pipe->fd, pipe->para.socket.ancill_flag.packet_auxdata,
+		pipe->para.socket.ancill_data_packet_auxdata.tp_vlan_tci);
+	 if (pipe->para.socket.ancill_flag.packet_auxdata &&
+	     pipe->para.socket.ancill_data_packet_auxdata.tp_vlan_tci != 0) {
+	    int offs = 12; 	/* packet type id in Ethernet header */
+	    Debug1("xioread(%d, ...): restoring VLAN id from auxdata->tp_vlan_tci",
+		   pipe->fd);
+	    if (bytes+4 > bufsiz) {
+	       Error("buffer too small to restore VLAN id");
+	    }
+	    memmove((char *)buff+offs+4, (char *)buff+offs, bytes-offs);
+	    ((unsigned short *)((char *)buff+offs))[0] = htons(ETH_P_8021Q);
+	    ((unsigned short *)((char *)buff+offs))[1] =
+	       htons(pipe->para.socket.ancill_data_packet_auxdata.tp_vlan_tci);
+	    bytes += 4;
+	 }
+      }
+#endif /* defined(PF_PACKET && HAVE_STRUCT_TPACKET_AUXDATA */
+
       Notice2("received packet with "F_Zu" bytes from %s",
 	      bytes,
 	      sockaddr_info(&from.soa, fromlen, infobuff, sizeof(infobuff)));
@@ -384,7 +406,7 @@ ssize_t xioread(xiofile_t *file, void *buff, size_t bufsiz) {
 	     errno == EINTR) ;
       if (rc < 0)  return -1;
 
-      xiodopacketinfo(&msgh, true, false);
+      xiodopacketinfo(pipe, &msgh, true, false);
       if (xiocheckpeer(pipe, &from, &pipe->para.socket.la) < 0) {
 	 Recvfrom(pipe->fd, buff, bufsiz, 0, &from.soa, &fromlen);  /* drop */
 	 errno = EAGAIN;  return -1;
@@ -420,6 +442,29 @@ ssize_t xioread(xiofile_t *file, void *buff, size_t bufsiz) {
       }
 #endif /* defined(PF_PACKET) && !defined(PACKET_IGNORE_OUTGOING) && defined(PACKET_OUTGOING) */
 
+#if defined(PF_PACKET) && HAVE_STRUCT_TPACKET_AUXDATA
+      if (from.soa.sa_family == PF_PACKET) {
+	 Debug3("xioread(%d, ...): auxdata: flag=%d, vlan-id=%d",
+		pipe->fd, pipe->para.socket.ancill_flag.packet_auxdata,
+		pipe->para.socket.ancill_data_packet_auxdata.tp_vlan_tci);
+	 if (pipe->para.socket.ancill_flag.packet_auxdata &&
+	     pipe->para.socket.ancill_data_packet_auxdata.tp_vlan_tci &&
+	     pipe->para.socket.ancill_data_packet_auxdata.tp_net >= 2) {
+	    Debug2("xioread(%d, ...): restoring VLAN id %d", pipe->fd, pipe->para.socket.ancill_data_packet_auxdata.tp_vlan_tci);
+	    int offs = pipe->para.socket.ancill_data_packet_auxdata.tp_net - 2;
+	    if (bytes+4 > bufsiz) {
+	       Error("buffer too small to restore VLAN id");
+	    }
+	    Debug3("xioread(): memmove(%p, %p, "F_Zu")", (char *)buff+offs+4, (char *)buff+offs, bytes-offs);
+	    memmove((char *)buff+offs+4, (char *)buff+offs, bytes-offs);
+	    ((unsigned short *)((char *)buff+offs))[0] = htons(ETH_P_8021Q);
+	    ((unsigned short *)((char *)buff+offs))[1] =
+	       htons(pipe->para.socket.ancill_data_packet_auxdata.tp_vlan_tci);
+	    bytes += 4;
+	 }
+      }
+#endif /* defined(PF_PACKET) &&& HAVE_STRUCT_TPACKET_AUXDATA */
+
       Notice2("received packet with "F_Zu" bytes from %s",
 	      bytes,
 	      sockaddr_info(&from.soa, fromlen, infobuff, sizeof(infobuff)));