mirror of https://github.com/subgraph/fw-daemon
Very dirty/experimental replacement of nfqueue with native github.com/subgraph/go-nfnetlink package.
shw
8 years ago
parent
4955c6a66b
commit
8fe02202de
@ -1,201 +0,0 @@
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@ -1,41 +0,0 @@
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package nfqueue
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import "sync"
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type multiQueue struct {
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qs []*nfQueue
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}
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func NewMultiQueue(min, max uint16) (mq *multiQueue) {
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mq = &multiQueue{make([]*nfQueue, 0, max-min)}
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for i := min; i < max; i++ {
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mq.qs = append(mq.qs, NewNFQueue(i))
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}
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return mq
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}
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func (mq *multiQueue) Process() <-chan *Packet {
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var (
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wg sync.WaitGroup
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out = make(chan *Packet, len(mq.qs))
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)
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for _, q := range mq.qs {
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wg.Add(1)
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go func(ch <-chan *Packet) {
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for pkt := range ch {
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out <- pkt
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}
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wg.Done()
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}(q.Process())
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}
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go func() {
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wg.Wait()
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close(out)
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}()
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return out
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}
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func (mq *multiQueue) Destroy() {
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for _, q := range mq.qs {
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q.Destroy()
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}
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}
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@ -1,87 +0,0 @@
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#include "nfqueue.h"
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#include "_cgo_export.h"
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int nfqueue_cb_new(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg, struct nfq_data *nfa, void *data) {
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struct nfqnl_msg_packet_hdr *ph = nfq_get_msg_packet_hdr(nfa);
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// struct nfqnl_msg_packet_hw *hwph = nfq_get_packet_hw(nfa);
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if(ph == NULL) {
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return 1;
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}
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int id = ntohl(ph->packet_id);
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unsigned char * payload;
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unsigned char * saddr, * daddr;
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uint16_t sport = 0, dport = 0, checksum = 0;
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uint32_t mark = nfq_get_nfmark(nfa);
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int len = nfq_get_payload(nfa, &payload);
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if(len < sizeof(struct iphdr)) {
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return 0;
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}
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struct iphdr * ip = (struct iphdr *) payload;
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if(ip->version == 4) {
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uint32_t ipsz = (ip->ihl << 2);
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if(len < ipsz) {
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return 0;
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}
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len -= ipsz;
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payload += ipsz;
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saddr = (unsigned char *)&ip->saddr;
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daddr = (unsigned char *)&ip->daddr;
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if(ip->protocol == IPPROTO_TCP) {
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if(len < sizeof(struct tcphdr)) {
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return 0;
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}
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struct tcphdr *tcp = (struct tcphdr *) payload;
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uint32_t tcpsz = (tcp->doff << 2);
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if(len < tcpsz) {
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return 0;
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}
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len -= tcpsz;
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payload += tcpsz;
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sport = ntohs(tcp->source);
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dport = ntohs(tcp->dest);
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checksum = ntohs(tcp->check);
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} else if(ip->protocol == IPPROTO_UDP) {
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if(len < sizeof(struct udphdr)) {
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return 0;
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}
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struct udphdr *u = (struct udphdr *) payload;
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len -= sizeof(struct udphdr);
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payload += sizeof(struct udphdr);
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sport = ntohs(u->source);
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dport = ntohs(u->dest);
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checksum = ntohs(u->check);
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}
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} else {
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struct ipv6hdr *ip6 = (struct ipv6hdr*) payload;
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saddr = (unsigned char *)&ip6->saddr;
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daddr = (unsigned char *)&ip6->daddr;
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//ipv6
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}
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//pass everything we can and let Go handle it, I'm not a big fan of C
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uint32_t verdict = go_nfq_callback(id, ntohs(ph->hw_protocol), ph->hook, &mark, ip->version, ip->protocol,
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ip->tos, ip->ttl, saddr, daddr, sport, dport, checksum, len, payload, data);
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return nfq_set_verdict2(qh, id, verdict, mark, 0, NULL);
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}
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void loop_for_packets(struct nfq_handle *h) {
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int fd = nfq_fd(h);
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char buf[4096] __attribute__ ((aligned));
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int rv;
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while ((rv = recv(fd, buf, sizeof(buf), 0)) && rv >= 0) {
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nfq_handle_packet(h, buf, rv);
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}
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}
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@ -1,180 +0,0 @@
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package nfqueue
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/*
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#cgo LDFLAGS: -lnetfilter_queue
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#cgo CFLAGS: -Wall
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#include "nfqueue.h"
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*/
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import "C"
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import (
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"net"
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"os"
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"runtime"
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"sync"
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"syscall"
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"time"
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"unsafe"
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)
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type nfQueue struct {
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DefaultVerdict Verdict
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Timeout time.Duration
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qid uint16
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h *C.struct_nfq_handle
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//qh *C.struct_q_handle
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qh *C.struct_nfq_q_handle
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fd int
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lk sync.Mutex
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pktch chan *Packet
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}
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func NewNFQueue(qid uint16) (nfq *nfQueue) {
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if os.Geteuid() != 0 {
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}
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if os.Geteuid() != 0 {
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panic("Must be ran by root.")
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}
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nfq = &nfQueue{DefaultVerdict: ACCEPT, Timeout: time.Microsecond * 5, qid: qid}
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return nfq
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}
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/*
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This returns a channel that will receive packets,
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the user then must call pkt.Accept() or pkt.Drop()
|
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*/
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func (this *nfQueue) Process() <-chan *Packet {
|
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if this.h != nil {
|
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return this.pktch
|
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}
|
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this.init()
|
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|
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go func() {
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runtime.LockOSThread()
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C.loop_for_packets(this.h)
|
||||
}()
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||||
|
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return this.pktch
|
||||
}
|
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|
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func (this *nfQueue) init() {
|
||||
var err error
|
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if this.h, err = C.nfq_open(); err != nil || this.h == nil {
|
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panic(err)
|
||||
}
|
||||
|
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//if this.qh, err = C.nfq_create_queue(this.h, qid, C.get_cb(), unsafe.Pointer(nfq)); err != nil || this.qh == nil {
|
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|
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this.pktch = make(chan *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), unsafe.Pointer(this)); 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
|
||||
}
|
||||
|
||||
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, nfqptr unsafe.Pointer) (v uint32) {
|
||||
|
||||
var (
|
||||
nfq = (*nfQueue)(nfqptr)
|
||||
ipver = IPVersion(version)
|
||||
ipsz = C.int(ipver.Size())
|
||||
)
|
||||
bs := C.GoBytes(payload, (C.int)(payload_len))
|
||||
|
||||
verdict := make(chan uint32, 1)
|
||||
pkt := Packet{
|
||||
QueueId: nfq.qid,
|
||||
Id: id,
|
||||
HWProtocol: hwproto,
|
||||
Hook: hook,
|
||||
Mark: *mark,
|
||||
Payload: bs,
|
||||
IPHeader: &IPHeader{
|
||||
Version: ipver,
|
||||
Protocol: IPProtocol(protocol),
|
||||
Tos: tos,
|
||||
TTL: ttl,
|
||||
Src: net.IP(C.GoBytes(saddr, ipsz)),
|
||||
Dst: net.IP(C.GoBytes(daddr, ipsz)),
|
||||
},
|
||||
|
||||
TCPUDPHeader: &TCPUDPHeader{
|
||||
SrcPort: sport,
|
||||
DstPort: dport,
|
||||
Checksum: checksum,
|
||||
},
|
||||
|
||||
verdict: verdict,
|
||||
}
|
||||
nfq.pktch <- &pkt
|
||||
|
||||
select {
|
||||
case v = <-pkt.verdict:
|
||||
*mark = pkt.Mark
|
||||
case <-time.After(nfq.Timeout):
|
||||
v = uint32(nfq.DefaultVerdict)
|
||||
}
|
||||
|
||||
return v
|
||||
}
|
||||
@ -1,27 +0,0 @@
|
||||
#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 num, void *data) {
|
||||
//we use this because it's more convient to pass the callback in C
|
||||
return nfq_create_queue(h, num, &nfqueue_cb_new, data);
|
||||
}
|
||||
@ -1,145 +0,0 @@
|
||||
package nfqueue
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
type (
|
||||
IPVersion uint8
|
||||
IPProtocol uint8
|
||||
Verdict uint8
|
||||
)
|
||||
|
||||
const (
|
||||
IPv4 = IPVersion(4)
|
||||
IPv6 = IPVersion(6)
|
||||
|
||||
//convience really
|
||||
IGMP = IPProtocol(syscall.IPPROTO_IGMP)
|
||||
RAW = IPProtocol(syscall.IPPROTO_RAW)
|
||||
TCP = IPProtocol(syscall.IPPROTO_TCP)
|
||||
UDP = IPProtocol(syscall.IPPROTO_UDP)
|
||||
ICMP = IPProtocol(syscall.IPPROTO_ICMP)
|
||||
ICMPv6 = IPProtocol(syscall.IPPROTO_ICMPV6)
|
||||
)
|
||||
|
||||
const (
|
||||
DROP Verdict = iota
|
||||
ACCEPT
|
||||
STOLEN
|
||||
QUEUE
|
||||
REPEAT
|
||||
STOP
|
||||
)
|
||||
|
||||
var (
|
||||
ErrVerdictSentOrTimedOut error = fmt.Errorf("The verdict was already sent or timed out.")
|
||||
)
|
||||
|
||||
func (v IPVersion) String() string {
|
||||
switch v {
|
||||
case IPv4:
|
||||
return "IPv4"
|
||||
case IPv6:
|
||||
return "IPv6"
|
||||
}
|
||||
return fmt.Sprintf("<unknown ip version, %d>", uint8(v))
|
||||
}
|
||||
|
||||
// Returns the byte size of the ip, IPv4 = 4 bytes, IPv6 = 16
|
||||
func (v IPVersion) Size() int {
|
||||
switch v {
|
||||
case IPv4:
|
||||
return 4
|
||||
case IPv6:
|
||||
return 16
|
||||
}
|
||||
return 0
|
||||
}
|
||||
|
||||
func (p IPProtocol) String() string {
|
||||
switch p {
|
||||
case RAW:
|
||||
return "RAW"
|
||||
case TCP:
|
||||
return "TCP"
|
||||
case UDP:
|
||||
return "UDP"
|
||||
case ICMP:
|
||||
return "ICMP"
|
||||
case ICMPv6:
|
||||
return "ICMPv6"
|
||||
case IGMP:
|
||||
return "IGMP"
|
||||
}
|
||||
return fmt.Sprintf("<unknown protocol, %d>", uint8(p))
|
||||
}
|
||||
|
||||
func (v Verdict) String() string {
|
||||
switch v {
|
||||
case DROP:
|
||||
return "DROP"
|
||||
case ACCEPT:
|
||||
return "ACCEPT"
|
||||
}
|
||||
return fmt.Sprintf("<unsupported verdict, %d>", uint8(v))
|
||||
}
|
||||
|
||||
type IPHeader struct {
|
||||
Version IPVersion
|
||||
|
||||
Tos, TTL uint8
|
||||
Protocol IPProtocol
|
||||
Src, Dst net.IP
|
||||
}
|
||||
|
||||
type TCPUDPHeader struct {
|
||||
SrcPort, DstPort uint16
|
||||
Checksum uint16 //not implemented
|
||||
}
|
||||
|
||||
// TODO handle other protocols
|
||||
|
||||
type Packet struct {
|
||||
QueueId uint16
|
||||
Id uint32
|
||||
HWProtocol uint16
|
||||
Hook uint8
|
||||
Mark uint32
|
||||
Payload []byte
|
||||
*IPHeader
|
||||
*TCPUDPHeader
|
||||
|
||||
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 Verdict) (err error) {
|
||||
defer func() {
|
||||
if x := recover(); x != nil {
|
||||
err = ErrVerdictSentOrTimedOut
|
||||
}
|
||||
}()
|
||||
pkt.verdict <- uint32(v)
|
||||
close(pkt.verdict)
|
||||
return err
|
||||
}
|
||||
|
||||
func (pkt *Packet) Accept() error {
|
||||
return pkt.setVerdict(ACCEPT)
|
||||
}
|
||||
|
||||
func (pkt *Packet) Drop() error {
|
||||
return pkt.setVerdict(DROP)
|
||||
}
|
||||
|
||||
//HUGE warning, if the iptables rules aren't set correctly this can cause some problems.
|
||||
// func (pkt *Packet) Repeat() error {
|
||||
// return this.SetVerdict(REPEAT)
|
||||
// }
|
||||
Loading…
Reference in new issue