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Go-NFQueue
==========
Go Wrapper For Creating IPTables' NFQueue clients in Go
Usage
------
Check the `examples/main.go` file
```bash
cd $GOPATH/github.com/OneOfOne/go-nfqueue/examples
go build -race && sudo ./examples
```
* Open another terminal :
```bash
sudo iptables -I INPUT 1 -m conntrack --ctstate NEW -j NFQUEUE --queue-num 0
#or
sudo iptables -I INPUT -i eth0 -m conntrack --ctstate NEW -j NFQUEUE --queue-num 0
curl --head localhost
ping localhost
sudo iptables -D INPUT -m conntrack --ctstate NEW -j NFQUEUE --queue-num 0
```
Then you can `ctrl+c` the program to exit.
* If you have recent enough iptables/nfqueue you could also use a balanced (multithreaded queue).
* check the example in `examples/mq/multiqueue.go`
```bash
iptables -I INPUT 1 -m conntrack --ctstate NEW -j NFQUEUE --queue-balance 0:5 --queue-cpu-fanout
```
Notes
-----
You must run the executable as root.
This is *WIP*, but all patches are welcome.
License
-------
go-nfqueue is under the Apache v2 license, check the included license file.
Copyright © [Ahmed W.](http://www.limitlessfx.com/)
See the included `LICENSE` file.
> Copyright (c) 2014 Ahmed W.

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firewall/interception/nfqueue/multiqueue.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package nfqueue
import (
"github.com/Safing/safing-core/network/packet"
"sync"
)
type multiQueue struct {
qs []*nfQueue
}
func NewMultiQueue(min, max uint16) (mq *multiQueue) {
mq = &multiQueue{make([]*nfQueue, 0, max-min)}
for i := min; i < max; i++ {
mq.qs = append(mq.qs, NewNFQueue(i))
}
return mq
}
func (mq *multiQueue) Process() <-chan packet.Packet {
var (
wg sync.WaitGroup
out = make(chan packet.Packet, len(mq.qs))
)
for _, q := range mq.qs {
wg.Add(1)
go func(ch <-chan packet.Packet) {
for pkt := range ch {
out <- pkt
}
wg.Done()
}(q.Process())
}
go func() {
wg.Wait()
close(out)
}()
return out
}
func (mq *multiQueue) Destroy() {
for _, q := range mq.qs {
q.Destroy()
}
}

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#include "nfqueue.h"
#include "_cgo_export.h"
int nfqueue_cb_new(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_data *nfa, void *data) {
struct nfqnl_msg_packet_hdr *ph = nfq_get_msg_packet_hdr(nfa);
if(ph == NULL) {
return 1;
}
int id = ntohl(ph->packet_id);
unsigned char * payload;
unsigned char * saddr, * daddr;
uint16_t sport = 0, dport = 0, checksum = 0;
uint32_t mark = nfq_get_nfmark(nfa);
int len = nfq_get_payload(nfa, &payload);
unsigned char * origpayload = payload;
int origlen = len;
if(len < sizeof(struct iphdr)) {
return 0;
}
struct iphdr * ip = (struct iphdr *) payload;
if(ip->version == 4) {
uint32_t ipsz = (ip->ihl << 2);
if(len < ipsz) {
return 0;
}
len -= ipsz;
payload += ipsz;
saddr = (unsigned char *)&ip->saddr;
daddr = (unsigned char *)&ip->daddr;
if(ip->protocol == IPPROTO_TCP) {
if(len < sizeof(struct tcphdr)) {
return 0;
}
struct tcphdr *tcp = (struct tcphdr *) payload;
uint32_t tcpsz = (tcp->doff << 2);
if(len < tcpsz) {
return 0;
}
len -= tcpsz;
payload += tcpsz;
sport = ntohs(tcp->source);
dport = ntohs(tcp->dest);
checksum = ntohs(tcp->check);
} else if(ip->protocol == IPPROTO_UDP) {
if(len < sizeof(struct udphdr)) {
return 0;
}
struct udphdr *u = (struct udphdr *) payload;
len -= sizeof(struct udphdr);
payload += sizeof(struct udphdr);
sport = ntohs(u->source);
dport = ntohs(u->dest);
checksum = ntohs(u->check);
}
} else {
struct ipv6hdr *ip6 = (struct ipv6hdr*) payload;
saddr = (unsigned char *)&ip6->saddr;
daddr = (unsigned char *)&ip6->daddr;
//ipv6
}
//pass everything we can and let Go handle it, I'm not a big fan of C
uint32_t verdict = go_nfq_callback(id, ntohs(ph->hw_protocol), ph->hook, &mark, ip->version, ip->protocol,
ip->tos, ip->ttl, saddr, daddr, sport, dport, checksum, origlen, origpayload, data);
return nfq_set_verdict2(qh, id, verdict, mark, 0, NULL);
}
void loop_for_packets(struct nfq_handle *h) {
int fd = nfq_fd(h);
char buf[65535] __attribute__ ((aligned));
int rv;
while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) {
nfq_handle_packet(h, buf, rv);
}
}

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firewall/interception/nfqueue/nfqueue.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package nfqueue
/*
#cgo LDFLAGS: -lnetfilter_queue
#cgo CFLAGS: -Wall
#include "nfqueue.h"
*/
import "C"
import (
"net"
"os"
"runtime"
"sync"
"syscall"
"time"
"unsafe"
"github.com/Safing/safing-core/network/packet"
)
var queues map[uint16]*nfQueue
func init() {
queues = make(map[uint16]*nfQueue)
}
type nfQueue struct {
DefaultVerdict uint32
Timeout time.Duration
qid uint16
qidptr *uint16
h *C.struct_nfq_handle
//qh *C.struct_q_handle
qh *C.struct_nfq_q_handle
fd int
lk sync.Mutex
pktch chan packet.Packet
}
func NewNFQueue(qid uint16) (nfq *nfQueue) {
if os.Geteuid() != 0 {
panic("Must be ran by root.")
}
nfq = &nfQueue{DefaultVerdict: NFQ_ACCEPT, Timeout: 100 * time.Millisecond, qid: qid, qidptr: &qid}
queues[nfq.qid] = nfq
return nfq
}
/*
This returns a channel that will recieve packets,
the user then must call pkt.Accept() or pkt.Drop()
*/
func (this *nfQueue) Process() <-chan packet.Packet {
if this.h != nil {
return this.pktch
}
this.init()
go func() {
runtime.LockOSThread()
C.loop_for_packets(this.h)
}()
return this.pktch
}
func (this *nfQueue) init() {
var err error
if this.h, err = C.nfq_open(); err != nil || this.h == nil {
panic(err)
}
//if this.qh, err = C.nfq_create_queue(this.h, qid, C.get_cb(), unsafe.Pointer(nfq)); err != nil || this.qh == nil {
this.pktch = make(chan packet.Packet, 1)
if C.nfq_unbind_pf(this.h, C.AF_INET) < 0 {
this.Destroy()
panic("nfq_unbind_pf(AF_INET) failed, are you running root?.")
}
if C.nfq_unbind_pf(this.h, C.AF_INET6) < 0 {
this.Destroy()
panic("nfq_unbind_pf(AF_INET6) failed.")
}
if C.nfq_bind_pf(this.h, C.AF_INET) < 0 {
this.Destroy()
panic("nfq_bind_pf(AF_INET) failed.")
}
if C.nfq_bind_pf(this.h, C.AF_INET6) < 0 {
this.Destroy()
panic("nfq_bind_pf(AF_INET6) failed.")
}
if this.qh, err = C.create_queue(this.h, C.uint16_t(this.qid)); err != nil || this.qh == nil {
C.nfq_close(this.h)
panic(err)
}
this.fd = int(C.nfq_fd(this.h))
if C.nfq_set_mode(this.qh, C.NFQNL_COPY_PACKET, 0xffff) < 0 {
this.Destroy()
panic("nfq_set_mode(NFQNL_COPY_PACKET) failed.")
}
if C.nfq_set_queue_maxlen(this.qh, 1024*8) < 0 {
this.Destroy()
panic("nfq_set_queue_maxlen(1024 * 8) failed.")
}
}
func (this *nfQueue) Destroy() {
this.lk.Lock()
defer this.lk.Unlock()
if this.fd != 0 && this.Valid() {
syscall.Close(this.fd)
}
if this.qh != nil {
C.nfq_destroy_queue(this.qh)
this.qh = nil
}
if this.h != nil {
C.nfq_close(this.h)
this.h = nil
}
// TODO: don't close, we're exiting anyway
// if this.pktch != nil {
// close(this.pktch)
// }
}
func (this *nfQueue) Valid() bool {
return this.h != nil && this.qh != nil
}
//export go_nfq_callback
func go_nfq_callback(id uint32, hwproto uint16, hook uint8, mark *uint32,
version, protocol, tos, ttl uint8, saddr, daddr unsafe.Pointer,
sport, dport, checksum uint16, payload_len uint32, payload, data unsafe.Pointer) (v uint32) {
qidptr := (*uint16)(data)
qid := uint16(*qidptr)
// nfq := (*nfQueue)(nfqptr)
new_version := version
ipver := packet.IPVersion(new_version)
ipsz := C.int(ipver.ByteSize())
bs := C.GoBytes(payload, (C.int)(payload_len))
verdict := make(chan uint32, 1)
pkt := Packet{
QueueId: qid,
Id: id,
HWProtocol: hwproto,
Hook: hook,
Mark: *mark,
verdict: verdict,
// StartedHandling: time.Now(),
}
// Payload
pkt.Payload = bs
// IPHeader
pkt.IPHeader = &packet.IPHeader{
Version: 4,
Protocol: packet.IPProtocol(protocol),
Tos: tos,
TTL: ttl,
Src: net.IP(C.GoBytes(saddr, ipsz)),
Dst: net.IP(C.GoBytes(daddr, ipsz)),
}
// TCPUDPHeader
pkt.TCPUDPHeader = &packet.TCPUDPHeader{
SrcPort: sport,
DstPort: dport,
Checksum: checksum,
}
// fmt.Printf("%s queuing packet\n", time.Now().Format("060102 15:04:05.000"))
// BUG: "panic: send on closed channel" when shutting down
queues[qid].pktch <- &pkt
select {
case v = <-pkt.verdict:
*mark = pkt.Mark
// *mark = 1710
case <-time.After(queues[qid].Timeout):
v = queues[qid].DefaultVerdict
}
// log.Tracef("nfqueue: took %s to handle packet", time.Now().Sub(pkt.StartedHandling).String())
return v
}

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#pragma once
// #define _BSD_SOURCE
// #define __BSD_SOURCE
// #define __FAVOR_BSD // Just Using _BSD_SOURCE didn't work on my system for some reason
// #define __USE_BSD
#include <stdlib.h>
// #include <sys/socket.h>
// #include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/ipv6.h>
// #include <linux/netfilter.h>
#include <libnetfilter_queue/libnetfilter_queue.h>
// extern int nfq_callback(uint8_t version, uint8_t protocol, unsigned char *saddr, unsigned char *daddr,
// uint16_t sport, uint16_t dport, unsigned char * extra, void* data);
int nfqueue_cb_new(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_data *nfa, void *data);
void loop_for_packets(struct nfq_handle *h);
static inline struct nfq_q_handle * create_queue(struct nfq_handle *h, uint16_t qid) {
//we use this because it's more convient to pass the callback in C
// FIXME: check malloc success
uint16_t *data = malloc(sizeof(uint16_t));
*data = qid;
return nfq_create_queue(h, qid, &nfqueue_cb_new, (void*)data);
}

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firewall/interception/nfqueue/packet.go Normal file
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// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
package nfqueue
import (
"fmt"
"github.com/Safing/safing-core/network/packet"
)
var (
ErrVerdictSentOrTimedOut error = fmt.Errorf("The verdict was already sent or timed out.")
)
const (
NFQ_DROP uint32 = 0 // discarded the packet
NFQ_ACCEPT uint32 = 1 // the packet passes, continue iterations
NFQ_STOLEN uint32 = 2 // gone away
NFQ_QUEUE uint32 = 3 // inject the packet into a different queue (the target queue number is in the high 16 bits of the verdict)
NFQ_REPEAT uint32 = 4 // iterate the same cycle once more
NFQ_STOP uint32 = 5 // accept, but don't continue iterations
)
type Packet struct {
packet.PacketBase
QueueId uint16
Id uint32
HWProtocol uint16
Hook uint8
Mark uint32
// StartedHandling time.Time
verdict chan uint32
}
// func (pkt *Packet) String() string {
// return fmt.Sprintf("<Packet QId: %d, Id: %d, Type: %s, Src: %s:%d, Dst: %s:%d, Mark: 0x%X, Checksum: 0x%X, TOS: 0x%X, TTL: %d>",
// pkt.QueueId, pkt.Id, pkt.Protocol, pkt.Src, pkt.SrcPort, pkt.Dst, pkt.DstPort, pkt.Mark, pkt.Checksum, pkt.Tos, pkt.TTL)
// }
func (pkt *Packet) setVerdict(v uint32) (err error) {
defer func() {
if x := recover(); x != nil {
err = ErrVerdictSentOrTimedOut
}
}()
pkt.verdict <- v
close(pkt.verdict)
// log.Tracef("firewall: packet %s verdict %d", pkt, v)
return err
}
// Marks:
// 17: Identifier
// 0/1: Just this packet/this Link
// 0/1/2: Accept, Block, Drop
// func (pkt *Packet) Accept() error {
// return pkt.setVerdict(NFQ_STOP)
// }
//
// func (pkt *Packet) Block() error {
// pkt.Mark = 1701
// return pkt.setVerdict(NFQ_ACCEPT)
// }
//
// func (pkt *Packet) Drop() error {
// return pkt.setVerdict(NFQ_DROP)
// }
func (pkt *Packet) Accept() error {
pkt.Mark = 1700
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) Block() error {
pkt.Mark = 1701
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) Drop() error {
pkt.Mark = 1702
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) PermanentAccept() error {
pkt.Mark = 1710
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) PermanentBlock() error {
pkt.Mark = 1711
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) PermanentDrop() error {
pkt.Mark = 1712
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) RerouteToNameserver() error {
pkt.Mark = 1799
return pkt.setVerdict(NFQ_ACCEPT)
}
func (pkt *Packet) RerouteToTunnel() error {
pkt.Mark = 1717
return pkt.setVerdict(NFQ_ACCEPT)
}
//HUGE warning, if the iptables rules aren't set correctly this can cause some problems.
// func (pkt *Packet) Repeat() error {
// return this.SetVerdict(REPEAT)
// }