diff --git a/netfilterqueue.c b/netfilterqueue.c
index b52ab2f..a274485 100644
--- a/netfilterqueue.c
+++ b/netfilterqueue.c
@@ -261,10 +261,12 @@ static CYTHON_INLINE float __PYX_NAN() {
 #define __PYX_HAVE__netfilterqueue
 #define __PYX_HAVE_API__netfilterqueue
 #include "sys/types.h"
+#include <errno.h>
 #include "netinet/ip.h"
 #include "sys/time.h"
 #include "netinet/in.h"
 #include "libnfnetlink/linux_nfnetlink.h"
+#include "libnfnetlink/libnfnetlink.h"
 #include "libnetfilter_queue/linux_nfnetlink_queue.h"
 #include "libnetfilter_queue/libnetfilter_queue.h"
 #include "sys/socket.h"
@@ -491,7 +493,18 @@ static const char *__pyx_f[] = {
 struct __pyx_obj_14netfilterqueue_Packet;
 struct __pyx_obj_14netfilterqueue_NetfilterQueue;
 
-/* "netfilterqueue.pxd":19
+/* "netfilterqueue.pxd":10
+ * 
+ * # dummy defines from asm-generic/errno.h:
+ * cdef enum:             # <<<<<<<<<<<<<<
+ *     ENOBUFS = 105         # No buffer space available
+ * 
+ */
+enum  {
+  __pyx_e_14netfilterqueue_ENOBUFS = 0x69
+};
+
+/* "netfilterqueue.pxd":26
  * 
  * # Dummy defines from netinet/in.h:
  * cdef enum:             # <<<<<<<<<<<<<<
@@ -529,7 +542,7 @@ enum  {
   __pyx_e_14netfilterqueue_IPPROTO_MAX
 };
 
-/* "netfilterqueue.pxd":136
+/* "netfilterqueue.pxd":149
  * 
  * # Dummy defines from linux/socket.h:
  * cdef enum: #  Protocol families, same as address families.             # <<<<<<<<<<<<<<
@@ -541,7 +554,7 @@ enum  {
   __pyx_e_14netfilterqueue_PF_INET6 = 10
 };
 
-/* "netfilterqueue.pxd":144
+/* "netfilterqueue.pxd":157
  * 
  * # Dummy defines from linux/netfilter.h
  * cdef enum:             # <<<<<<<<<<<<<<
@@ -550,7 +563,7 @@ enum  {
  */
 enum  {
 
-  /* "netfilterqueue.pxd":151
+  /* "netfilterqueue.pxd":164
  *     NF_REPEAT
  *     NF_STOP
  *     NF_MAX_VERDICT = NF_STOP             # <<<<<<<<<<<<<<
@@ -566,7 +579,7 @@ enum  {
   __pyx_e_14netfilterqueue_NF_MAX_VERDICT = __pyx_e_14netfilterqueue_NF_STOP
 };
 
-/* "netfilterqueue.pxd":153
+/* "netfilterqueue.pxd":166
  *     NF_MAX_VERDICT = NF_STOP
  * 
  * cdef class Packet:             # <<<<<<<<<<<<<<
@@ -593,7 +606,7 @@ struct __pyx_obj_14netfilterqueue_Packet {
 };
 
 
-/* "netfilterqueue.pxd":192
+/* "netfilterqueue.pxd":205
  *     cpdef repeat(self)
  * 
  * cdef class NetfilterQueue:             # <<<<<<<<<<<<<<
@@ -611,7 +624,7 @@ struct __pyx_obj_14netfilterqueue_NetfilterQueue {
 
 
 
-/* "netfilterqueue.pyx":36
+/* "netfilterqueue.pyx":40
  *     return 1
  * 
  * cdef class Packet:             # <<<<<<<<<<<<<<
@@ -834,6 +847,9 @@ static CYTHON_INLINE PyObject* __Pyx_PyInt_From_u_int16_t(u_int16_t value);
 /* CIntToPy.proto */
 static CYTHON_INLINE PyObject* __Pyx_PyInt_From_int(int value);
 
+/* CIntToPy.proto */
+static CYTHON_INLINE PyObject* __Pyx_PyInt_From_unsigned_int(unsigned int value);
+
 /* CIntFromPy.proto */
 static CYTHON_INLINE u_int32_t __Pyx_PyInt_As_u_int32_t(PyObject *);
 
@@ -1016,6 +1032,7 @@ static const char __pyx_k_SSCOPMCE[] = "SSCOPMCE";
 static const char __pyx_k_WB_EXPAK[] = "WB-EXPAK";
 static const char __pyx_k_get_mark[] = "get_mark";
 static const char __pyx_k_set_mark[] = "set_mark";
+static const char __pyx_k_sock_len[] = "sock_len";
 static const char __pyx_k_COPY_META[] = "COPY_META";
 static const char __pyx_k_COPY_NONE[] = "COPY_NONE";
 static const char __pyx_k_IDPR_CMTP[] = "IDPR-CMTP";
@@ -1049,7 +1066,6 @@ static const char __pyx_k_Unknown_protocol[] = "Unknown protocol";
 static const char __pyx_k_s_packet_s_bytes[] = "%s packet, %s bytes";
 static const char __pyx_k_any_local_network[] = "any local network";
 static const char __pyx_k_any_0_hop_protocol[] = "any 0-hop protocol";
-static const char __pyx_k_DEFAULT_MAX_QUEUELEN[] = "DEFAULT_MAX_QUEUELEN";
 static const char __pyx_k_Failed_to_open_NFQueue[] = "Failed to open NFQueue.";
 static const char __pyx_k_Failed_to_create_queue_s[] = "Failed to create queue %s.";
 static const char __pyx_k_any_host_internal_protocol[] = "any host internal protocol";
@@ -1059,6 +1075,7 @@ static const char __pyx_k_Failed_to_set_packet_copy_mode[] = "Failed to set pack
 static const char __pyx_k_Bind_to_a_Linux_netfilter_queue[] = "\nBind to a Linux netfilter queue. Send packets to a user-specified callback\nfunction.\n\nCopyright: (c) 2011, Kerkhoff Technologies Inc.\nLicense: MIT; see LICENSE.txt\n";
 static const char __pyx_k_Failed_to_bind_family_s_Are_you[] = "Failed to bind family %s. Are you root?";
 static const char __pyx_k_Failed_to_get_payload_of_packet[] = "Failed to get payload of packet.";
+static const char __pyx_k_Socket_rcvbuf_limit_is_now_d_req[] = "Socket rcvbuf limit is now %d, requested %d.";
 static const char __pyx_k_Verdict_already_given_for_this_p[] = "Verdict already given for this packet.";
 static PyObject *__pyx_kp_s_3PC;
 static PyObject *__pyx_n_s_AH;
@@ -1084,7 +1101,6 @@ static PyObject *__pyx_n_s_DCCP;
 static PyObject *__pyx_kp_s_DCN_MEAS;
 static PyObject *__pyx_n_s_DDP;
 static PyObject *__pyx_n_s_DDX;
-static PyObject *__pyx_n_s_DEFAULT_MAX_QUEUELEN;
 static PyObject *__pyx_n_s_DGP;
 static PyObject *__pyx_n_s_DSR;
 static PyObject *__pyx_n_s_EGP;
@@ -1187,6 +1203,7 @@ static PyObject *__pyx_n_s_STP;
 static PyObject *__pyx_kp_s_SUN_ND;
 static PyObject *__pyx_n_s_SWIPE;
 static PyObject *__pyx_n_s_Shim6;
+static PyObject *__pyx_kp_s_Socket_rcvbuf_limit_is_now_d_req;
 static PyObject *__pyx_kp_s_Sprite_RPC;
 static PyObject *__pyx_n_s_TCF;
 static PyObject *__pyx_n_s_TCP;
@@ -1234,6 +1251,7 @@ static PyObject *__pyx_n_s_repeat;
 static PyObject *__pyx_kp_s_s_packet_s_bytes;
 static PyObject *__pyx_n_s_set_mark;
 static PyObject *__pyx_n_s_set_payload;
+static PyObject *__pyx_n_s_sock_len;
 static PyObject *__pyx_n_s_test;
 static PyObject *__pyx_n_s_user_callback;
 static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfilterqueue_Packet *__pyx_v_self); /* proto */
@@ -1254,7 +1272,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4mark___get__(struct __pyx_ob
 static PyObject *__pyx_pf_14netfilterqueue_6Packet_7payload___get__(struct __pyx_obj_14netfilterqueue_Packet *__pyx_v_self); /* proto */
 static int __pyx_pf_14netfilterqueue_14NetfilterQueue___cinit__(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self, CYTHON_UNUSED PyObject *__pyx_v_args, PyObject *__pyx_v_kwargs); /* proto */
 static void __pyx_pf_14netfilterqueue_14NetfilterQueue_2__dealloc__(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self, int __pyx_v_queue_num, PyObject *__pyx_v_user_callback, u_int32_t __pyx_v_max_len, u_int8_t __pyx_v_mode, u_int32_t __pyx_v_range); /* proto */
+static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self, int __pyx_v_queue_num, PyObject *__pyx_v_user_callback, u_int32_t __pyx_v_max_len, u_int8_t __pyx_v_mode, u_int32_t __pyx_v_range, u_int32_t __pyx_v_sock_len); /* proto */
 static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self); /* proto */
 static PyObject *__pyx_tp_new_14netfilterqueue_Packet(PyTypeObject *t, PyObject *a, PyObject *k); /*proto*/
@@ -1401,16 +1419,14 @@ static PyObject *__pyx_int_138;
 static PyObject *__pyx_int_139;
 static PyObject *__pyx_int_140;
 static PyObject *__pyx_int_255;
-static PyObject *__pyx_int_1024;
-static u_int32_t __pyx_k__4;
-static u_int8_t __pyx_k__5;
+static u_int8_t __pyx_k__4;
 static PyObject *__pyx_tuple_;
 static PyObject *__pyx_tuple__2;
 static PyObject *__pyx_tuple__3;
+static PyObject *__pyx_tuple__5;
 static PyObject *__pyx_tuple__6;
-static PyObject *__pyx_tuple__7;
 
-/* "netfilterqueue.pyx":25
+/* "netfilterqueue.pyx":29
  * cimport cpython.version
  * 
  * cdef int global_callback(nfq_q_handle *qh, nfgenmsg *nfmsg,             # <<<<<<<<<<<<<<
@@ -1433,7 +1449,7 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   #endif
   __Pyx_RefNannySetupContext("global_callback", 0);
 
-  /* "netfilterqueue.pyx":28
+  /* "netfilterqueue.pyx":32
  *                          nfq_data *nfa, void *data) with gil:
  *     """Create a Packet and pass it to appropriate callback."""
  *     cdef NetfilterQueue nfqueue = <NetfilterQueue>data             # <<<<<<<<<<<<<<
@@ -1445,7 +1461,7 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   __pyx_v_nfqueue = ((struct __pyx_obj_14netfilterqueue_NetfilterQueue *)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":29
+  /* "netfilterqueue.pyx":33
  *     """Create a Packet and pass it to appropriate callback."""
  *     cdef NetfilterQueue nfqueue = <NetfilterQueue>data
  *     cdef object user_callback = <object>nfqueue.user_callback             # <<<<<<<<<<<<<<
@@ -1457,30 +1473,30 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   __pyx_v_user_callback = __pyx_t_1;
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":31
+  /* "netfilterqueue.pyx":35
  *     cdef object user_callback = <object>nfqueue.user_callback
  * 
  *     packet = Packet()             # <<<<<<<<<<<<<<
  *     packet.set_nfq_data(qh, nfa)
  *     user_callback(packet)
  */
-  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)__pyx_ptype_14netfilterqueue_Packet), __pyx_empty_tuple, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 31, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)__pyx_ptype_14netfilterqueue_Packet), __pyx_empty_tuple, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 35, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_packet = ((struct __pyx_obj_14netfilterqueue_Packet *)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":32
+  /* "netfilterqueue.pyx":36
  * 
  *     packet = Packet()
  *     packet.set_nfq_data(qh, nfa)             # <<<<<<<<<<<<<<
  *     user_callback(packet)
  *     return 1
  */
-  __pyx_t_1 = ((struct __pyx_vtabstruct_14netfilterqueue_Packet *)__pyx_v_packet->__pyx_vtab)->set_nfq_data(__pyx_v_packet, __pyx_v_qh, __pyx_v_nfa); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 32, __pyx_L1_error)
+  __pyx_t_1 = ((struct __pyx_vtabstruct_14netfilterqueue_Packet *)__pyx_v_packet->__pyx_vtab)->set_nfq_data(__pyx_v_packet, __pyx_v_qh, __pyx_v_nfa); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 36, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":33
+  /* "netfilterqueue.pyx":37
  *     packet = Packet()
  *     packet.set_nfq_data(qh, nfa)
  *     user_callback(packet)             # <<<<<<<<<<<<<<
@@ -1499,23 +1515,23 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
     }
   }
   if (!__pyx_t_3) {
-    __pyx_t_1 = __Pyx_PyObject_CallOneArg(__pyx_t_2, ((PyObject *)__pyx_v_packet)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 33, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_CallOneArg(__pyx_t_2, ((PyObject *)__pyx_v_packet)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 37, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
   } else {
-    __pyx_t_4 = PyTuple_New(1+1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 33, __pyx_L1_error)
+    __pyx_t_4 = PyTuple_New(1+1); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 37, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
     __Pyx_GIVEREF(__pyx_t_3); PyTuple_SET_ITEM(__pyx_t_4, 0, __pyx_t_3); __pyx_t_3 = NULL;
     __Pyx_INCREF(((PyObject *)__pyx_v_packet));
     __Pyx_GIVEREF(((PyObject *)__pyx_v_packet));
     PyTuple_SET_ITEM(__pyx_t_4, 0+1, ((PyObject *)__pyx_v_packet));
-    __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_2, __pyx_t_4, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 33, __pyx_L1_error)
+    __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_2, __pyx_t_4, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 37, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
     __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
   }
   __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":34
+  /* "netfilterqueue.pyx":38
  *     packet.set_nfq_data(qh, nfa)
  *     user_callback(packet)
  *     return 1             # <<<<<<<<<<<<<<
@@ -1525,7 +1541,7 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   __pyx_r = 1;
   goto __pyx_L0;
 
-  /* "netfilterqueue.pyx":25
+  /* "netfilterqueue.pyx":29
  * cimport cpython.version
  * 
  * cdef int global_callback(nfq_q_handle *qh, nfgenmsg *nfmsg,             # <<<<<<<<<<<<<<
@@ -1552,7 +1568,7 @@ static int __pyx_f_14netfilterqueue_global_callback(struct nfq_q_handle *__pyx_v
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":38
+/* "netfilterqueue.pyx":42
  * cdef class Packet:
  *     """A packet received from NetfilterQueue."""
  *     def __cinit__(self):             # <<<<<<<<<<<<<<
@@ -1581,7 +1597,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
   __Pyx_RefNannyDeclarations
   __Pyx_RefNannySetupContext("__cinit__", 0);
 
-  /* "netfilterqueue.pyx":39
+  /* "netfilterqueue.pyx":43
  *     """A packet received from NetfilterQueue."""
  *     def __cinit__(self):
  *         self._verdict_is_set = False             # <<<<<<<<<<<<<<
@@ -1590,7 +1606,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
  */
   __pyx_v_self->_verdict_is_set = 0;
 
-  /* "netfilterqueue.pyx":40
+  /* "netfilterqueue.pyx":44
  *     def __cinit__(self):
  *         self._verdict_is_set = False
  *         self._mark_is_set = False             # <<<<<<<<<<<<<<
@@ -1599,7 +1615,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
  */
   __pyx_v_self->_mark_is_set = 0;
 
-  /* "netfilterqueue.pyx":41
+  /* "netfilterqueue.pyx":45
  *         self._verdict_is_set = False
  *         self._mark_is_set = False
  *         self._given_payload = None             # <<<<<<<<<<<<<<
@@ -1612,7 +1628,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
   __Pyx_DECREF(__pyx_v_self->_given_payload);
   __pyx_v_self->_given_payload = ((PyObject*)Py_None);
 
-  /* "netfilterqueue.pyx":38
+  /* "netfilterqueue.pyx":42
  * cdef class Packet:
  *     """A packet received from NetfilterQueue."""
  *     def __cinit__(self):             # <<<<<<<<<<<<<<
@@ -1626,7 +1642,7 @@ static int __pyx_pf_14netfilterqueue_6Packet___cinit__(struct __pyx_obj_14netfil
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":43
+/* "netfilterqueue.pyx":47
  *         self._given_payload = None
  * 
  *     def __str__(self):             # <<<<<<<<<<<<<<
@@ -1660,7 +1676,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   PyObject *__pyx_t_6 = NULL;
   __Pyx_RefNannySetupContext("__str__", 0);
 
-  /* "netfilterqueue.pyx":44
+  /* "netfilterqueue.pyx":48
  * 
  *     def __str__(self):
  *         cdef iphdr *hdr = <iphdr*>self.payload             # <<<<<<<<<<<<<<
@@ -1669,19 +1685,19 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
  */
   __pyx_v_hdr = ((struct iphdr *)__pyx_v_self->payload);
 
-  /* "netfilterqueue.pyx":45
+  /* "netfilterqueue.pyx":49
  *     def __str__(self):
  *         cdef iphdr *hdr = <iphdr*>self.payload
  *         protocol = PROTOCOLS.get(hdr.protocol, "Unknown protocol")             # <<<<<<<<<<<<<<
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)
  * 
  */
-  __pyx_t_2 = __Pyx_GetModuleGlobalName(__pyx_n_s_PROTOCOLS); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 45, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_GetModuleGlobalName(__pyx_n_s_PROTOCOLS); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 49, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_2);
-  __pyx_t_3 = __Pyx_PyObject_GetAttrStr(__pyx_t_2, __pyx_n_s_get); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 45, __pyx_L1_error)
+  __pyx_t_3 = __Pyx_PyObject_GetAttrStr(__pyx_t_2, __pyx_n_s_get); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 49, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_3);
   __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-  __pyx_t_2 = __Pyx_PyInt_From_u_int8_t(__pyx_v_hdr->protocol); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 45, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyInt_From_u_int8_t(__pyx_v_hdr->protocol); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 49, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_2);
   __pyx_t_4 = NULL;
   __pyx_t_5 = 0;
@@ -1695,7 +1711,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
       __pyx_t_5 = 1;
     }
   }
-  __pyx_t_6 = PyTuple_New(2+__pyx_t_5); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 45, __pyx_L1_error)
+  __pyx_t_6 = PyTuple_New(2+__pyx_t_5); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 49, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_6);
   if (__pyx_t_4) {
     __Pyx_GIVEREF(__pyx_t_4); PyTuple_SET_ITEM(__pyx_t_6, 0, __pyx_t_4); __pyx_t_4 = NULL;
@@ -1706,14 +1722,14 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   __Pyx_GIVEREF(__pyx_kp_s_Unknown_protocol);
   PyTuple_SET_ITEM(__pyx_t_6, 1+__pyx_t_5, __pyx_kp_s_Unknown_protocol);
   __pyx_t_2 = 0;
-  __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_3, __pyx_t_6, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 45, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_Call(__pyx_t_3, __pyx_t_6, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 49, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __Pyx_DECREF(__pyx_t_6); __pyx_t_6 = 0;
   __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
   __pyx_v_protocol = __pyx_t_1;
   __pyx_t_1 = 0;
 
-  /* "netfilterqueue.pyx":46
+  /* "netfilterqueue.pyx":50
  *         cdef iphdr *hdr = <iphdr*>self.payload
  *         protocol = PROTOCOLS.get(hdr.protocol, "Unknown protocol")
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)             # <<<<<<<<<<<<<<
@@ -1721,9 +1737,9 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
  *     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa):
  */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = PyInt_FromSsize_t(__pyx_v_self->payload_len); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 46, __pyx_L1_error)
+  __pyx_t_1 = PyInt_FromSsize_t(__pyx_v_self->payload_len); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 50, __pyx_L1_error)
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-  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 46, __pyx_L1_error)
+  __pyx_t_3 = PyTuple_New(2); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 50, __pyx_L1_error)
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   __Pyx_GIVEREF(__pyx_v_protocol);
@@ -1731,14 +1747,14 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   __Pyx_GIVEREF(__pyx_t_1);
   PyTuple_SET_ITEM(__pyx_t_3, 1, __pyx_t_1);
   __pyx_t_1 = 0;
-  __pyx_t_1 = __Pyx_PyString_Format(__pyx_kp_s_s_packet_s_bytes, __pyx_t_3); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 46, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyString_Format(__pyx_kp_s_s_packet_s_bytes, __pyx_t_3); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 50, __pyx_L1_error)
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   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "netfilterqueue.pyx":43
+  /* "netfilterqueue.pyx":47
  *         self._given_payload = None
  * 
  *     def __str__(self):             # <<<<<<<<<<<<<<
@@ -1762,7 +1778,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2__str__(struct __pyx_obj_14n
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":48
+/* "netfilterqueue.pyx":52
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)
  * 
  *     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa):             # <<<<<<<<<<<<<<
@@ -1778,7 +1794,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   PyObject *__pyx_t_3 = NULL;
   __Pyx_RefNannySetupContext("set_nfq_data", 0);
 
-  /* "netfilterqueue.pyx":53
+  /* "netfilterqueue.pyx":57
  *         local values.
  *         """
  *         self._qh = qh             # <<<<<<<<<<<<<<
@@ -1787,7 +1803,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->_qh = __pyx_v_qh;
 
-  /* "netfilterqueue.pyx":54
+  /* "netfilterqueue.pyx":58
  *         """
  *         self._qh = qh
  *         self._nfa = nfa             # <<<<<<<<<<<<<<
@@ -1796,7 +1812,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->_nfa = __pyx_v_nfa;
 
-  /* "netfilterqueue.pyx":55
+  /* "netfilterqueue.pyx":59
  *         self._qh = qh
  *         self._nfa = nfa
  *         self._hdr = nfq_get_msg_packet_hdr(nfa)             # <<<<<<<<<<<<<<
@@ -1805,7 +1821,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->_hdr = nfq_get_msg_packet_hdr(__pyx_v_nfa);
 
-  /* "netfilterqueue.pyx":57
+  /* "netfilterqueue.pyx":61
  *         self._hdr = nfq_get_msg_packet_hdr(nfa)
  * 
  *         self.id = ntohl(self._hdr.packet_id)             # <<<<<<<<<<<<<<
@@ -1814,7 +1830,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->id = ntohl(__pyx_v_self->_hdr->packet_id);
 
-  /* "netfilterqueue.pyx":58
+  /* "netfilterqueue.pyx":62
  * 
  *         self.id = ntohl(self._hdr.packet_id)
  *         self.hw_protocol = ntohs(self._hdr.hw_protocol)             # <<<<<<<<<<<<<<
@@ -1823,7 +1839,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->hw_protocol = ntohs(__pyx_v_self->_hdr->hw_protocol);
 
-  /* "netfilterqueue.pyx":59
+  /* "netfilterqueue.pyx":63
  *         self.id = ntohl(self._hdr.packet_id)
  *         self.hw_protocol = ntohs(self._hdr.hw_protocol)
  *         self.hook = self._hdr.hook             # <<<<<<<<<<<<<<
@@ -1833,7 +1849,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   __pyx_t_1 = __pyx_v_self->_hdr->hook;
   __pyx_v_self->hook = __pyx_t_1;
 
-  /* "netfilterqueue.pyx":61
+  /* "netfilterqueue.pyx":65
  *         self.hook = self._hdr.hook
  * 
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)             # <<<<<<<<<<<<<<
@@ -1842,7 +1858,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->payload_len = nfq_get_payload(__pyx_v_self->_nfa, (&__pyx_v_self->payload));
 
-  /* "netfilterqueue.pyx":62
+  /* "netfilterqueue.pyx":66
  * 
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)
  *         if self.payload_len < 0:             # <<<<<<<<<<<<<<
@@ -1852,20 +1868,20 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   __pyx_t_2 = ((__pyx_v_self->payload_len < 0) != 0);
   if (__pyx_t_2) {
 
-    /* "netfilterqueue.pyx":63
+    /* "netfilterqueue.pyx":67
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)
  *         if self.payload_len < 0:
  *             raise OSError("Failed to get payload of packet.")             # <<<<<<<<<<<<<<
  * 
  *         nfq_get_timestamp(self._nfa, &self.timestamp)
  */
-    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_OSError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 63, __pyx_L1_error)
+    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_OSError, __pyx_tuple_, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 67, __pyx_L1_error)
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     __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-    __PYX_ERR(0, 63, __pyx_L1_error)
+    __PYX_ERR(0, 67, __pyx_L1_error)
 
-    /* "netfilterqueue.pyx":62
+    /* "netfilterqueue.pyx":66
  * 
  *         self.payload_len = nfq_get_payload(self._nfa, &self.payload)
  *         if self.payload_len < 0:             # <<<<<<<<<<<<<<
@@ -1874,7 +1890,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   }
 
-  /* "netfilterqueue.pyx":65
+  /* "netfilterqueue.pyx":69
  *             raise OSError("Failed to get payload of packet.")
  * 
  *         nfq_get_timestamp(self._nfa, &self.timestamp)             # <<<<<<<<<<<<<<
@@ -1883,7 +1899,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   nfq_get_timestamp(__pyx_v_self->_nfa, (&__pyx_v_self->timestamp));
 
-  /* "netfilterqueue.pyx":66
+  /* "netfilterqueue.pyx":70
  * 
  *         nfq_get_timestamp(self._nfa, &self.timestamp)
  *         self.mark = nfq_get_nfmark(nfa)             # <<<<<<<<<<<<<<
@@ -1892,7 +1908,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
  */
   __pyx_v_self->mark = nfq_get_nfmark(__pyx_v_nfa);
 
-  /* "netfilterqueue.pyx":48
+  /* "netfilterqueue.pyx":52
  *         return "%s packet, %s bytes" % (protocol, self.payload_len)
  * 
  *     cdef set_nfq_data(self, nfq_q_handle *qh, nfq_data *nfa):             # <<<<<<<<<<<<<<
@@ -1913,7 +1929,7 @@ static PyObject *__pyx_f_14netfilterqueue_6Packet_set_nfq_data(struct __pyx_obj_
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":68
+/* "netfilterqueue.pyx":72
  *         self.mark = nfq_get_nfmark(nfa)
  * 
  *     cdef void verdict(self, u_int8_t verdict):             # <<<<<<<<<<<<<<
@@ -1931,7 +1947,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   unsigned char *__pyx_t_4;
   __Pyx_RefNannySetupContext("verdict", 0);
 
-  /* "netfilterqueue.pyx":70
+  /* "netfilterqueue.pyx":74
  *     cdef void verdict(self, u_int8_t verdict):
  *         """Call appropriate set_verdict... function on packet."""
  *         if self._verdict_is_set:             # <<<<<<<<<<<<<<
@@ -1941,20 +1957,20 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   __pyx_t_1 = (__pyx_v_self->_verdict_is_set != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":71
+    /* "netfilterqueue.pyx":75
  *         """Call appropriate set_verdict... function on packet."""
  *         if self._verdict_is_set:
  *             raise RuntimeWarning("Verdict already given for this packet.")             # <<<<<<<<<<<<<<
  * 
  *         cdef u_int32_t modified_payload_len = 0
  */
-    __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_RuntimeWarning, __pyx_tuple__2, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 71, __pyx_L1_error)
+    __pyx_t_2 = __Pyx_PyObject_Call(__pyx_builtin_RuntimeWarning, __pyx_tuple__2, NULL); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 75, __pyx_L1_error)
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     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-    __PYX_ERR(0, 71, __pyx_L1_error)
+    __PYX_ERR(0, 75, __pyx_L1_error)
 
-    /* "netfilterqueue.pyx":70
+    /* "netfilterqueue.pyx":74
  *     cdef void verdict(self, u_int8_t verdict):
  *         """Call appropriate set_verdict... function on packet."""
  *         if self._verdict_is_set:             # <<<<<<<<<<<<<<
@@ -1963,7 +1979,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   }
 
-  /* "netfilterqueue.pyx":73
+  /* "netfilterqueue.pyx":77
  *             raise RuntimeWarning("Verdict already given for this packet.")
  * 
  *         cdef u_int32_t modified_payload_len = 0             # <<<<<<<<<<<<<<
@@ -1972,7 +1988,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   __pyx_v_modified_payload_len = 0;
 
-  /* "netfilterqueue.pyx":74
+  /* "netfilterqueue.pyx":78
  * 
  *         cdef u_int32_t modified_payload_len = 0
  *         cdef unsigned char *modified_payload = NULL             # <<<<<<<<<<<<<<
@@ -1981,7 +1997,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   __pyx_v_modified_payload = NULL;
 
-  /* "netfilterqueue.pyx":75
+  /* "netfilterqueue.pyx":79
  *         cdef u_int32_t modified_payload_len = 0
  *         cdef unsigned char *modified_payload = NULL
  *         if self._given_payload:             # <<<<<<<<<<<<<<
@@ -1991,7 +2007,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   __pyx_t_1 = (__pyx_v_self->_given_payload != Py_None) && (PyBytes_GET_SIZE(__pyx_v_self->_given_payload) != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":76
+    /* "netfilterqueue.pyx":80
  *         cdef unsigned char *modified_payload = NULL
  *         if self._given_payload:
  *             modified_payload_len = len(self._given_payload)             # <<<<<<<<<<<<<<
@@ -2002,23 +2018,23 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
     __Pyx_INCREF(__pyx_t_2);
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       PyErr_SetString(PyExc_TypeError, "object of type 'NoneType' has no len()");
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+      __PYX_ERR(0, 80, __pyx_L1_error)
     }
-    __pyx_t_3 = PyBytes_GET_SIZE(__pyx_t_2); if (unlikely(__pyx_t_3 == -1)) __PYX_ERR(0, 76, __pyx_L1_error)
+    __pyx_t_3 = PyBytes_GET_SIZE(__pyx_t_2); if (unlikely(__pyx_t_3 == -1)) __PYX_ERR(0, 80, __pyx_L1_error)
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
     __pyx_v_modified_payload_len = __pyx_t_3;
 
-    /* "netfilterqueue.pyx":77
+    /* "netfilterqueue.pyx":81
  *         if self._given_payload:
  *             modified_payload_len = len(self._given_payload)
  *             modified_payload = self._given_payload             # <<<<<<<<<<<<<<
  *         if self._mark_is_set:
  *             nfq_set_verdict_mark(
  */
-    __pyx_t_4 = __Pyx_PyObject_AsUString(__pyx_v_self->_given_payload); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 77, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_AsUString(__pyx_v_self->_given_payload); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 81, __pyx_L1_error)
     __pyx_v_modified_payload = __pyx_t_4;
 
-    /* "netfilterqueue.pyx":75
+    /* "netfilterqueue.pyx":79
  *         cdef u_int32_t modified_payload_len = 0
  *         cdef unsigned char *modified_payload = NULL
  *         if self._given_payload:             # <<<<<<<<<<<<<<
@@ -2027,7 +2043,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   }
 
-  /* "netfilterqueue.pyx":78
+  /* "netfilterqueue.pyx":82
  *             modified_payload_len = len(self._given_payload)
  *             modified_payload = self._given_payload
  *         if self._mark_is_set:             # <<<<<<<<<<<<<<
@@ -2037,7 +2053,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   __pyx_t_1 = (__pyx_v_self->_mark_is_set != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":79
+    /* "netfilterqueue.pyx":83
  *             modified_payload = self._given_payload
  *         if self._mark_is_set:
  *             nfq_set_verdict_mark(             # <<<<<<<<<<<<<<
@@ -2046,7 +2062,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
     nfq_set_verdict_mark(__pyx_v_self->_qh, __pyx_v_self->id, __pyx_v_verdict, htonl(__pyx_v_self->_given_mark), __pyx_v_modified_payload_len, __pyx_v_modified_payload);
 
-    /* "netfilterqueue.pyx":78
+    /* "netfilterqueue.pyx":82
  *             modified_payload_len = len(self._given_payload)
  *             modified_payload = self._given_payload
  *         if self._mark_is_set:             # <<<<<<<<<<<<<<
@@ -2056,7 +2072,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
     goto __pyx_L5;
   }
 
-  /* "netfilterqueue.pyx":87
+  /* "netfilterqueue.pyx":91
  *                 modified_payload)
  *         else:
  *             nfq_set_verdict(             # <<<<<<<<<<<<<<
@@ -2065,7 +2081,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   /*else*/ {
 
-    /* "netfilterqueue.pyx":92
+    /* "netfilterqueue.pyx":96
  *                 verdict,
  *                 modified_payload_len,
  *                 modified_payload)             # <<<<<<<<<<<<<<
@@ -2076,7 +2092,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   }
   __pyx_L5:;
 
-  /* "netfilterqueue.pyx":94
+  /* "netfilterqueue.pyx":98
  *                 modified_payload)
  * 
  *         self._verdict_is_set = True             # <<<<<<<<<<<<<<
@@ -2085,7 +2101,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
  */
   __pyx_v_self->_verdict_is_set = 1;
 
-  /* "netfilterqueue.pyx":68
+  /* "netfilterqueue.pyx":72
  *         self.mark = nfq_get_nfmark(nfa)
  * 
  *     cdef void verdict(self, u_int8_t verdict):             # <<<<<<<<<<<<<<
@@ -2102,7 +2118,7 @@ static void __pyx_f_14netfilterqueue_6Packet_verdict(struct __pyx_obj_14netfilte
   __Pyx_RefNannyFinishContext();
 }
 
-/* "netfilterqueue.pyx":96
+/* "netfilterqueue.pyx":100
  *         self._verdict_is_set = True
  * 
  *     def get_payload(self):             # <<<<<<<<<<<<<<
@@ -2132,7 +2148,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4get_payload(struct __pyx_obj
   PyObject *__pyx_t_2 = NULL;
   __Pyx_RefNannySetupContext("get_payload", 0);
 
-  /* "netfilterqueue.pyx":99
+  /* "netfilterqueue.pyx":103
  *         """Return payload as Python string."""
  *         cdef object py_string
  *         if cpython.version.PY_MAJOR_VERSION >= 3:             # <<<<<<<<<<<<<<
@@ -2142,19 +2158,19 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4get_payload(struct __pyx_obj
   __pyx_t_1 = ((PY_MAJOR_VERSION >= 3) != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":100
+    /* "netfilterqueue.pyx":104
  *         cdef object py_string
  *         if cpython.version.PY_MAJOR_VERSION >= 3:
  *             py_string = PyBytes_FromStringAndSize(             # <<<<<<<<<<<<<<
  *                 self.payload, self.payload_len)
  *         else:
  */
-    __pyx_t_2 = PyBytes_FromStringAndSize(__pyx_v_self->payload, __pyx_v_self->payload_len); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 100, __pyx_L1_error)
+    __pyx_t_2 = PyBytes_FromStringAndSize(__pyx_v_self->payload, __pyx_v_self->payload_len); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 104, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __pyx_v_py_string = __pyx_t_2;
     __pyx_t_2 = 0;
 
-    /* "netfilterqueue.pyx":99
+    /* "netfilterqueue.pyx":103
  *         """Return payload as Python string."""
  *         cdef object py_string
  *         if cpython.version.PY_MAJOR_VERSION >= 3:             # <<<<<<<<<<<<<<
@@ -2164,7 +2180,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4get_payload(struct __pyx_obj
     goto __pyx_L3;
   }
 
-  /* "netfilterqueue.pyx":103
+  /* "netfilterqueue.pyx":107
  *                 self.payload, self.payload_len)
  *         else:
  *             py_string = PyString_FromStringAndSize(             # <<<<<<<<<<<<<<
@@ -2173,21 +2189,21 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4get_payload(struct __pyx_obj
  */
   /*else*/ {
 
-    /* "netfilterqueue.pyx":104
+    /* "netfilterqueue.pyx":108
  *         else:
  *             py_string = PyString_FromStringAndSize(
  *                 self.payload, self.payload_len)             # <<<<<<<<<<<<<<
  *         return py_string
  * 
  */
-    __pyx_t_2 = PyString_FromStringAndSize(__pyx_v_self->payload, __pyx_v_self->payload_len); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 103, __pyx_L1_error)
+    __pyx_t_2 = PyString_FromStringAndSize(__pyx_v_self->payload, __pyx_v_self->payload_len); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 107, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __pyx_v_py_string = __pyx_t_2;
     __pyx_t_2 = 0;
   }
   __pyx_L3:;
 
-  /* "netfilterqueue.pyx":105
+  /* "netfilterqueue.pyx":109
  *             py_string = PyString_FromStringAndSize(
  *                 self.payload, self.payload_len)
  *         return py_string             # <<<<<<<<<<<<<<
@@ -2199,7 +2215,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4get_payload(struct __pyx_obj
   __pyx_r = __pyx_v_py_string;
   goto __pyx_L0;
 
-  /* "netfilterqueue.pyx":96
+  /* "netfilterqueue.pyx":100
  *         self._verdict_is_set = True
  * 
  *     def get_payload(self):             # <<<<<<<<<<<<<<
@@ -2219,7 +2235,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4get_payload(struct __pyx_obj
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":107
+/* "netfilterqueue.pyx":111
  *         return py_string
  * 
  *     cpdef Py_ssize_t get_payload_len(self):             # <<<<<<<<<<<<<<
@@ -2241,7 +2257,7 @@ static Py_ssize_t __pyx_f_14netfilterqueue_6Packet_get_payload_len(struct __pyx_
   if (unlikely(__pyx_skip_dispatch)) ;
   /* Check if overridden in Python */
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@@ -3887,31 +3918,31 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
   __pyx_t_1 = ((__pyx_v_self->qh == NULL) != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":167
+    /* "netfilterqueue.pyx":173
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  * 
  *         if range > MaxCopySize:
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+    __pyx_t_2 = __Pyx_PyInt_From_int(__pyx_v_queue_num); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 173, __pyx_L1_error)
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-    __pyx_t_2 = PyTuple_New(1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 167, __pyx_L1_error)
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+    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_OSError, __pyx_t_2, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 173, __pyx_L1_error)
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-    /* "netfilterqueue.pyx":166
+    /* "netfilterqueue.pyx":172
  *         self.qh = nfq_create_queue(self.h, queue_num,
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@@ -3920,7 +3951,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
  */
   }
 
-  /* "netfilterqueue.pyx":169
+  /* "netfilterqueue.pyx":175
  *             raise OSError("Failed to create queue %s." % queue_num)
  * 
  *         if range > MaxCopySize:             # <<<<<<<<<<<<<<
@@ -3930,7 +3961,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
   __pyx_t_1 = ((__pyx_v_range > 0xFB0) != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":170
+    /* "netfilterqueue.pyx":176
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  *         if range > MaxCopySize:
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@@ -3939,7 +3970,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
  */
     __pyx_v_range = 0xFB0;
 
-    /* "netfilterqueue.pyx":169
+    /* "netfilterqueue.pyx":175
  *             raise OSError("Failed to create queue %s." % queue_num)
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  *         if range > MaxCopySize:             # <<<<<<<<<<<<<<
@@ -3948,7 +3979,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
  */
   }
 
-  /* "netfilterqueue.pyx":171
+  /* "netfilterqueue.pyx":177
  *         if range > MaxCopySize:
  *             range = MaxCopySize
  *         if nfq_set_mode(self.qh, mode, range) < 0:             # <<<<<<<<<<<<<<
@@ -3958,20 +3989,20 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
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   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":172
+    /* "netfilterqueue.pyx":178
  *             range = MaxCopySize
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  *             raise OSError("Failed to set packet copy mode.")             # <<<<<<<<<<<<<<
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  *         nfq_set_queue_maxlen(self.qh, max_len)
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+    __pyx_t_3 = __Pyx_PyObject_Call(__pyx_builtin_OSError, __pyx_tuple__5, NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 178, __pyx_L1_error)
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-    /* "netfilterqueue.pyx":171
+    /* "netfilterqueue.pyx":177
  *         if range > MaxCopySize:
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  */
   }
 
-  /* "netfilterqueue.pyx":174
+  /* "netfilterqueue.pyx":180
  *             raise OSError("Failed to set packet copy mode.")
  * 
  *         nfq_set_queue_maxlen(self.qh, max_len)             # <<<<<<<<<<<<<<
  * 
- *     def unbind(self):
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  */
   nfq_set_queue_maxlen(__pyx_v_self->qh, __pyx_v_max_len);
 
-  /* "netfilterqueue.pyx":158
+  /* "netfilterqueue.pyx":182
+ *         nfq_set_queue_maxlen(self.qh, max_len)
+ * 
+ *         newsiz = nfnl_rcvbufsiz(nfq_nfnlh(self.h),sock_len)             # <<<<<<<<<<<<<<
+ *         if newsiz != sock_len*2:
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+ */
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+
+  /* "netfilterqueue.pyx":183
+ * 
+ *         newsiz = nfnl_rcvbufsiz(nfq_nfnlh(self.h),sock_len)
+ *         if newsiz != sock_len*2:             # <<<<<<<<<<<<<<
+ *             raise RuntimeWarning("Socket rcvbuf limit is now %d, requested %d." % (newsiz,sock_len))
+ * 
+ */
+  __pyx_t_1 = ((__pyx_v_newsiz != (__pyx_v_sock_len * 2)) != 0);
+  if (__pyx_t_1) {
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+    /* "netfilterqueue.pyx":184
+ *         newsiz = nfnl_rcvbufsiz(nfq_nfnlh(self.h),sock_len)
+ *         if newsiz != sock_len*2:
+ *             raise RuntimeWarning("Socket rcvbuf limit is now %d, requested %d." % (newsiz,sock_len))             # <<<<<<<<<<<<<<
+ * 
+ *     def unbind(self):
+ */
+    __pyx_t_3 = __Pyx_PyInt_From_unsigned_int(__pyx_v_newsiz); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 184, __pyx_L1_error)
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+    __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
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+    /* "netfilterqueue.pyx":183
+ * 
+ *         newsiz = nfnl_rcvbufsiz(nfq_nfnlh(self.h),sock_len)
+ *         if newsiz != sock_len*2:             # <<<<<<<<<<<<<<
+ *             raise RuntimeWarning("Socket rcvbuf limit is now %d, requested %d." % (newsiz,sock_len))
+ * 
+ */
+  }
+
+  /* "netfilterqueue.pyx":162
  *         nfq_close(self.h)
  * 
  *     def bind(self, int queue_num, object user_callback,             # <<<<<<<<<<<<<<
@@ -4003,6 +4096,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
   __pyx_L1_error:;
   __Pyx_XDECREF(__pyx_t_2);
   __Pyx_XDECREF(__pyx_t_3);
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@@ -4011,8 +4105,8 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_o
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":176
- *         nfq_set_queue_maxlen(self.qh, max_len)
+/* "netfilterqueue.pyx":186
+ *             raise RuntimeWarning("Socket rcvbuf limit is now %d, requested %d." % (newsiz,sock_len))
  * 
  *     def unbind(self):             # <<<<<<<<<<<<<<
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@@ -4039,7 +4133,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
   int __pyx_t_1;
   __Pyx_RefNannySetupContext("unbind", 0);
 
-  /* "netfilterqueue.pyx":178
+  /* "netfilterqueue.pyx":188
  *     def unbind(self):
  *         """Destroy the queue."""
  *         if self.qh != NULL:             # <<<<<<<<<<<<<<
@@ -4049,7 +4143,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
   __pyx_t_1 = ((__pyx_v_self->qh != NULL) != 0);
   if (__pyx_t_1) {
 
-    /* "netfilterqueue.pyx":179
+    /* "netfilterqueue.pyx":189
  *         """Destroy the queue."""
  *         if self.qh != NULL:
  *             nfq_destroy_queue(self.qh)             # <<<<<<<<<<<<<<
@@ -4058,7 +4152,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
  */
     nfq_destroy_queue(__pyx_v_self->qh);
 
-    /* "netfilterqueue.pyx":178
+    /* "netfilterqueue.pyx":188
  *     def unbind(self):
  *         """Destroy the queue."""
  *         if self.qh != NULL:             # <<<<<<<<<<<<<<
@@ -4067,7 +4161,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
  */
   }
 
-  /* "netfilterqueue.pyx":180
+  /* "netfilterqueue.pyx":190
  *         if self.qh != NULL:
  *             nfq_destroy_queue(self.qh)
  *         self.qh = NULL             # <<<<<<<<<<<<<<
@@ -4076,8 +4170,8 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
  */
   __pyx_v_self->qh = NULL;
 
-  /* "netfilterqueue.pyx":176
- *         nfq_set_queue_maxlen(self.qh, max_len)
+  /* "netfilterqueue.pyx":186
+ *             raise RuntimeWarning("Socket rcvbuf limit is now %d, requested %d." % (newsiz,sock_len))
  * 
  *     def unbind(self):             # <<<<<<<<<<<<<<
  *         """Destroy the queue."""
@@ -4091,7 +4185,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
   return __pyx_r;
 }
 
-/* "netfilterqueue.pyx":183
+/* "netfilterqueue.pyx":193
  *         # See warning about nfq_unbind_pf in __dealloc__ above.
  * 
  *     def run(self):             # <<<<<<<<<<<<<<
@@ -4122,7 +4216,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
   int __pyx_t_1;
   __Pyx_RefNannySetupContext("run", 0);
 
-  /* "netfilterqueue.pyx":185
+  /* "netfilterqueue.pyx":195
  *     def run(self):
  *         """Begin accepting packets."""
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@@ -4131,74 +4225,21 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
  */
   __pyx_v_fd = nfq_fd(__pyx_v_self->h);
 
-  /* "netfilterqueue.pyx":188
+  /* "netfilterqueue.pyx":198
  *         cdef char buf[BufferSize]
  *         cdef int rv
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- *             rv = recv(fd, buf, sizeof(buf), 0)
- *         while rv >= 0:
- */
-  {
-      #ifdef WITH_THREAD
-      PyThreadState *_save;
-      Py_UNBLOCK_THREADS
-      #endif
-      /*try:*/ {
-
-        /* "netfilterqueue.pyx":189
- *         cdef int rv
- *         with nogil:
- *             rv = recv(fd, buf, sizeof(buf), 0)             # <<<<<<<<<<<<<<
- *         while rv >= 0:
- *             nfq_handle_packet(self.h, buf, rv)
- */
-        __pyx_v_rv = recv(__pyx_v_fd, __pyx_v_buf, (sizeof(__pyx_v_buf)), 0);
-      }
-
-      /* "netfilterqueue.pyx":188
- *         cdef char buf[BufferSize]
- *         cdef int rv
- *         with nogil:             # <<<<<<<<<<<<<<
- *             rv = recv(fd, buf, sizeof(buf), 0)
- *         while rv >= 0:
- */
-      /*finally:*/ {
-        /*normal exit:*/{
-          #ifdef WITH_THREAD
-          Py_BLOCK_THREADS
-          #endif
-          goto __pyx_L5;
-        }
-        __pyx_L5:;
-      }
-  }
-
-  /* "netfilterqueue.pyx":190
- *         with nogil:
- *             rv = recv(fd, buf, sizeof(buf), 0)
- *         while rv >= 0:             # <<<<<<<<<<<<<<
- *             nfq_handle_packet(self.h, buf, rv)
+ *         while True:             # <<<<<<<<<<<<<<
  *             with nogil:
+ *                 rv = recv(fd, buf, sizeof(buf), 0)
  */
   while (1) {
-    __pyx_t_1 = ((__pyx_v_rv >= 0) != 0);
-    if (!__pyx_t_1) break;
 
-    /* "netfilterqueue.pyx":191
- *             rv = recv(fd, buf, sizeof(buf), 0)
- *         while rv >= 0:
- *             nfq_handle_packet(self.h, buf, rv)             # <<<<<<<<<<<<<<
- *             with nogil:
- *                 rv = recv(fd, buf, sizeof(buf), 0)
- */
-    nfq_handle_packet(__pyx_v_self->h, __pyx_v_buf, __pyx_v_rv);
-
-    /* "netfilterqueue.pyx":192
- *         while rv >= 0:
- *             nfq_handle_packet(self.h, buf, rv)
+    /* "netfilterqueue.pyx":199
+ *         cdef int rv
+ *         while True:
  *             with nogil:             # <<<<<<<<<<<<<<
  *                 rv = recv(fd, buf, sizeof(buf), 0)
- * 
+ *             if (rv >= 0):
  */
     {
         #ifdef WITH_THREAD
@@ -4207,36 +4248,97 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
         #endif
         /*try:*/ {
 
-          /* "netfilterqueue.pyx":193
- *             nfq_handle_packet(self.h, buf, rv)
+          /* "netfilterqueue.pyx":200
+ *         while True:
  *             with nogil:
  *                 rv = recv(fd, buf, sizeof(buf), 0)             # <<<<<<<<<<<<<<
- * 
- * PROTOCOLS = {
+ *             if (rv >= 0):
+ *                 nfq_handle_packet(self.h, buf, rv)
  */
           __pyx_v_rv = recv(__pyx_v_fd, __pyx_v_buf, (sizeof(__pyx_v_buf)), 0);
         }
 
-        /* "netfilterqueue.pyx":192
- *         while rv >= 0:
- *             nfq_handle_packet(self.h, buf, rv)
+        /* "netfilterqueue.pyx":199
+ *         cdef int rv
+ *         while True:
  *             with nogil:             # <<<<<<<<<<<<<<
  *                 rv = recv(fd, buf, sizeof(buf), 0)
- * 
+ *             if (rv >= 0):
  */
         /*finally:*/ {
           /*normal exit:*/{
             #ifdef WITH_THREAD
             Py_BLOCK_THREADS
             #endif
-            goto __pyx_L12;
+            goto __pyx_L9;
           }
-          __pyx_L12:;
+          __pyx_L9:;
         }
     }
-  }
 
-  /* "netfilterqueue.pyx":183
+    /* "netfilterqueue.pyx":201
+ *             with nogil:
+ *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *             if (rv >= 0):             # <<<<<<<<<<<<<<
+ *                 nfq_handle_packet(self.h, buf, rv)
+ *             else:
+ */
+    __pyx_t_1 = ((__pyx_v_rv >= 0) != 0);
+    if (__pyx_t_1) {
+
+      /* "netfilterqueue.pyx":202
+ *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *             if (rv >= 0):
+ *                 nfq_handle_packet(self.h, buf, rv)             # <<<<<<<<<<<<<<
+ *             else:
+ *                 if errno != ENOBUFS:
+ */
+      nfq_handle_packet(__pyx_v_self->h, __pyx_v_buf, __pyx_v_rv);
+
+      /* "netfilterqueue.pyx":201
+ *             with nogil:
+ *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *             if (rv >= 0):             # <<<<<<<<<<<<<<
+ *                 nfq_handle_packet(self.h, buf, rv)
+ *             else:
+ */
+      goto __pyx_L10;
+    }
+
+    /* "netfilterqueue.pyx":204
+ *                 nfq_handle_packet(self.h, buf, rv)
+ *             else:
+ *                 if errno != ENOBUFS:             # <<<<<<<<<<<<<<
+ *                     break
+ * 
+ */
+    /*else*/ {
+      __pyx_t_1 = ((errno != __pyx_e_14netfilterqueue_ENOBUFS) != 0);
+      if (__pyx_t_1) {
+
+        /* "netfilterqueue.pyx":205
+ *             else:
+ *                 if errno != ENOBUFS:
+ *                     break             # <<<<<<<<<<<<<<
+ * 
+ * PROTOCOLS = {
+ */
+        goto __pyx_L4_break;
+
+        /* "netfilterqueue.pyx":204
+ *                 nfq_handle_packet(self.h, buf, rv)
+ *             else:
+ *                 if errno != ENOBUFS:             # <<<<<<<<<<<<<<
+ *                     break
+ * 
+ */
+      }
+    }
+    __pyx_L10:;
+  }
+  __pyx_L4_break:;
+
+  /* "netfilterqueue.pyx":193
  *         # See warning about nfq_unbind_pf in __dealloc__ above.
  * 
  *     def run(self):             # <<<<<<<<<<<<<<
@@ -4556,7 +4658,6 @@ static __Pyx_StringTabEntry __pyx_string_tab[] = {
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   {&__pyx_n_s_DDX, __pyx_k_DDX, sizeof(__pyx_k_DDX), 0, 0, 1, 1},
-  {&__pyx_n_s_DEFAULT_MAX_QUEUELEN, __pyx_k_DEFAULT_MAX_QUEUELEN, sizeof(__pyx_k_DEFAULT_MAX_QUEUELEN), 0, 0, 1, 1},
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   {&__pyx_n_s_Shim6, __pyx_k_Shim6, sizeof(__pyx_k_Shim6), 0, 0, 1, 1},
+  {&__pyx_kp_s_Socket_rcvbuf_limit_is_now_d_req, __pyx_k_Socket_rcvbuf_limit_is_now_d_req, sizeof(__pyx_k_Socket_rcvbuf_limit_is_now_d_req), 0, 0, 1, 0},
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   {&__pyx_n_s_TCF, __pyx_k_TCF, sizeof(__pyx_k_TCF), 0, 0, 1, 1},
   {&__pyx_n_s_TCP, __pyx_k_TCP, sizeof(__pyx_k_TCP), 0, 0, 1, 1},
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   {&__pyx_n_s_set_mark, __pyx_k_set_mark, sizeof(__pyx_k_set_mark), 0, 0, 1, 1},
   {&__pyx_n_s_set_payload, __pyx_k_set_payload, sizeof(__pyx_k_set_payload), 0, 0, 1, 1},
+  {&__pyx_n_s_sock_len, __pyx_k_sock_len, sizeof(__pyx_k_sock_len), 0, 0, 1, 1},
   {&__pyx_n_s_test, __pyx_k_test, sizeof(__pyx_k_test), 0, 0, 1, 1},
   {&__pyx_n_s_user_callback, __pyx_k_user_callback, sizeof(__pyx_k_user_callback), 0, 0, 1, 1},
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 static int __Pyx_InitCachedBuiltins(void) {
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-  /* "netfilterqueue.pyx":63
+  /* "netfilterqueue.pyx":67
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  *         if self.payload_len < 0:
  *             raise OSError("Failed to get payload of packet.")             # <<<<<<<<<<<<<<
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  *         nfq_get_timestamp(self._nfa, &self.timestamp)
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-  /* "netfilterqueue.pyx":71
+  /* "netfilterqueue.pyx":75
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  *         if self._verdict_is_set:
  *             raise RuntimeWarning("Verdict already given for this packet.")             # <<<<<<<<<<<<<<
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-  /* "netfilterqueue.pyx":145
+  /* "netfilterqueue.pyx":149
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  *         if self.h == NULL:
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-  /* "netfilterqueue.pyx":172
+  /* "netfilterqueue.pyx":178
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  *             raise OSError("Failed to set packet copy mode.")             # <<<<<<<<<<<<<<
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-  __Pyx_GIVEREF(__pyx_tuple__6);
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@@ -4942,7 +5044,6 @@ PyMODINIT_FUNC PyInit_netfilterqueue(void)
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@@ -5053,7 +5154,7 @@ PyMODINIT_FUNC PyInit_netfilterqueue(void)
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-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_VERSION, __pyx_tuple__7) < 0) __PYX_ERR(0, 8, __pyx_L1_error)
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@@ -5078,193 +5179,171 @@ PyMODINIT_FUNC PyInit_netfilterqueue(void)
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  * COPY_PACKET = 3             # <<<<<<<<<<<<<<
  * 
- * DEFAULT_MAX_QUEUELEN = 1024
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-  /* "netfilterqueue.pyx":159
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  *                 u_int8_t mode=NFQNL_COPY_PACKET,             # <<<<<<<<<<<<<<
- *                 u_int32_t range=MaxPacketSize):
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+ *                 u_int32_t range=MaxPacketSize,
+ *                 u_int32_t sock_len=SockRcvSize):
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   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
   /* "netfilterqueue.pyx":1
@@ -6215,6 +6294,33 @@ bad:
     }
 }
 
+/* CIntToPy */
+        static CYTHON_INLINE PyObject* __Pyx_PyInt_From_unsigned_int(unsigned int value) {
+    const unsigned int neg_one = (unsigned int) -1, const_zero = (unsigned int) 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (is_unsigned) {
+        if (sizeof(unsigned int) < sizeof(long)) {
+            return PyInt_FromLong((long) value);
+        } else if (sizeof(unsigned int) <= sizeof(unsigned long)) {
+            return PyLong_FromUnsignedLong((unsigned long) value);
+        } else if (sizeof(unsigned int) <= sizeof(unsigned PY_LONG_LONG)) {
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG) value);
+        }
+    } else {
+        if (sizeof(unsigned int) <= sizeof(long)) {
+            return PyInt_FromLong((long) value);
+        } else if (sizeof(unsigned int) <= sizeof(PY_LONG_LONG)) {
+            return PyLong_FromLongLong((PY_LONG_LONG) value);
+        }
+    }
+    {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&value;
+        return _PyLong_FromByteArray(bytes, sizeof(unsigned int),
+                                     little, !is_unsigned);
+    }
+}
+
 /* CIntFromPy */
         static CYTHON_INLINE u_int32_t __Pyx_PyInt_As_u_int32_t(PyObject *x) {
     const u_int32_t neg_one = (u_int32_t) -1, const_zero = (u_int32_t) 0;
diff --git a/netfilterqueue.pxd b/netfilterqueue.pxd
index cacd38b..4cd3a47 100644
--- a/netfilterqueue.pxd
+++ b/netfilterqueue.pxd
@@ -3,6 +3,13 @@ cdef extern from "sys/types.h":
     ctypedef unsigned short int u_int16_t
     ctypedef unsigned int u_int32_t
 
+cdef extern from "<errno.h>":
+    int errno
+
+# dummy defines from asm-generic/errno.h:
+cdef enum:
+    ENOBUFS = 105         # No buffer space available
+
 cdef extern from "netinet/ip.h":
     struct iphdr:
         u_int8_t tos
@@ -70,6 +77,11 @@ cdef extern from "libnfnetlink/linux_nfnetlink.h":
         u_int8_t version
         u_int16_t res_id
 
+cdef extern from "libnfnetlink/libnfnetlink.h":
+    struct nfnl_handle:
+        pass
+    unsigned int nfnl_rcvbufsiz(nfnl_handle *h, unsigned int size)
+
 cdef extern from "libnetfilter_queue/linux_nfnetlink_queue.h":
     enum nfqnl_config_mode:
         NFQNL_COPY_NONE
@@ -131,7 +143,8 @@ cdef extern from "libnetfilter_queue/libnetfilter_queue.h":
     int nfq_get_timestamp(nfq_data *nfad, timeval *tv)
     nfqnl_msg_packet_hw *nfq_get_packet_hw(nfq_data *nfad)
     int nfq_get_nfmark (nfq_data *nfad)
-
+    nfnl_handle *nfq_nfnlh(nfq_handle *h)
+    
 # Dummy defines from linux/socket.h:
 cdef enum: #  Protocol families, same as address families.
     PF_INET = 2
diff --git a/netfilterqueue.pyx b/netfilterqueue.pyx
index abc2c80..485c507 100644
--- a/netfilterqueue.pyx
+++ b/netfilterqueue.pyx
@@ -12,13 +12,17 @@ COPY_NONE = 1
 COPY_META = 2
 COPY_PACKET = 3
 
-DEFAULT_MAX_QUEUELEN = 1024
-
 # Packet copying defaults
+DEF DEFAULT_MAX_QUEUELEN = 1024
 DEF MaxPacketSize = 0xFFFF
 DEF BufferSize = 4096
 DEF MetadataSize = 80
 DEF MaxCopySize = BufferSize - MetadataSize
+# Experimentally determined overhead
+DEF SockOverhead = 760+20
+DEF SockCopySize = MaxCopySize + SockOverhead
+# Socket queue should hold max number of packets of copysize bytes
+DEF SockRcvSize = DEFAULT_MAX_QUEUELEN * SockCopySize / 2
 
 cimport cpython.version
 
@@ -158,8 +162,10 @@ cdef class NetfilterQueue:
     def bind(self, int queue_num, object user_callback,
                 u_int32_t max_len=DEFAULT_MAX_QUEUELEN,
                 u_int8_t mode=NFQNL_COPY_PACKET,
-                u_int32_t range=MaxPacketSize):
+                u_int32_t range=MaxPacketSize,
+                u_int32_t sock_len=SockRcvSize):
         """Create and bind to a new queue."""
+        cdef unsigned int newsiz
         self.user_callback = user_callback
         self.qh = nfq_create_queue(self.h, queue_num,
                                    <nfq_callback*>global_callback, <void*>self)
@@ -173,6 +179,10 @@ cdef class NetfilterQueue:
 
         nfq_set_queue_maxlen(self.qh, max_len)
 
+        newsiz = nfnl_rcvbufsiz(nfq_nfnlh(self.h),sock_len)
+        if newsiz != sock_len*2:
+            raise RuntimeWarning("Socket rcvbuf limit is now %d, requested %d." % (newsiz,sock_len))
+    
     def unbind(self):
         """Destroy the queue."""
         if self.qh != NULL:
@@ -185,12 +195,14 @@ cdef class NetfilterQueue:
         cdef int fd = nfq_fd(self.h)
         cdef char buf[BufferSize]
         cdef int rv
-        with nogil:
-            rv = recv(fd, buf, sizeof(buf), 0)
-        while rv >= 0:
-            nfq_handle_packet(self.h, buf, rv)
+        while True:
             with nogil:
                 rv = recv(fd, buf, sizeof(buf), 0)
+            if (rv >= 0):
+                nfq_handle_packet(self.h, buf, rv)
+            else:
+                if errno != ENOBUFS:
+                    break
 
 PROTOCOLS = {
     0: "HOPOPT",