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This commit is contained in:
Domingo Dirutigliano
2025-02-17 13:07:06 +01:00
parent 7f7e3353ec
commit 5a1e1bc225
6 changed files with 106 additions and 67 deletions
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2
backend/binsrc/classes/netfilter.cpp
View File

@@ -24,8 +24,8 @@ public:
void loop() {
static_cast<Derived*>(this)->before_loop();
PktRequest<Derived>* pkt;
for(;;) {
PktRequest<Derived>* pkt;
queue.take(pkt);
static_cast<Derived*>(this)->handle_next_packet(pkt);
delete pkt;

122
backend/binsrc/classes/nfqueue.cpp
View File

@@ -23,22 +23,21 @@ class PktRequest {
private:
FilterAction action = FilterAction::NOACTION;
mnl_socket* nl = nullptr;
nfgenmsg * nfg = nullptr;
nfqnl_msg_packet_hdr *ph;
shared_ptr<char[]> packet_buffer; // Will be deallocated here
size_t data_size = 0;
uint16_t res_id;
uint32_t packet_id;
public:
const bool is_ipv6;
bool is_ipv6;
Tins::IP* ipv4 = nullptr;
Tins::IPv6* ipv6 = nullptr;
Tins::TCP* tcp = nullptr;
Tins::UDP* udp = nullptr;
const L4Proto l4_proto;
const bool is_input;
const string packet;
const string data;
const stream_id sid;
L4Proto l4_proto;
bool is_input;
string packet;
char* data;
size_t data_size;
stream_id sid;
T* ctx;
@@ -89,14 +88,22 @@ class PktRequest {
public:
PktRequest(shared_ptr<char[]> buf, Tins::IP* ipv4, const char* payload, size_t plen, stream_id sid, T* ctx, mnl_socket* nl, nfgenmsg *nfg, nfqnl_msg_packet_hdr *ph, bool is_input):
is_ipv6(false), ipv4(ipv4), packet(string(payload, plen)), sid(sid), ctx(ctx), nl(nl), nfg(nfg), ph(ph),
is_input(is_input), packet_buffer(buf), l4_proto(fill_l4_info()), data(string(payload+(plen-data_size), data_size)) {}
PktRequest(shared_ptr<char[]> buf, Tins::IPv6* ipv6, const char* payload, size_t plen, stream_id sid, T* ctx, mnl_socket* nl, nfgenmsg *nfg, nfqnl_msg_packet_hdr *ph, bool is_input):
is_ipv6(true), ipv6(ipv6), packet(string(payload, plen)), sid(sid), ctx(ctx), nl(nl), nfg(nfg), ph(ph),
is_input(is_input), packet_buffer(buf), l4_proto(fill_l4_info()), data(string(payload+(plen-data_size), data_size)) {}
PktRequest(const char* payload, size_t plen, T* ctx, mnl_socket* nl, nfgenmsg *nfg, nfqnl_msg_packet_hdr *ph, bool is_input):
ctx(ctx), nl(nl), res_id(nfg->res_id),
packet_id(ph->packet_id), is_input(is_input),
packet(string(payload, plen)),
is_ipv6((payload[0] & 0xf0) == 0x60){
if (is_ipv6){
ipv6 = new Tins::IPv6((uint8_t*)packet.c_str(), plen);
sid = stream_id::make_identifier(*ipv6);
}else{
ipv4 = new Tins::IP((uint8_t*)packet.c_str(), plen);
sid = stream_id::make_identifier(*ipv4);
}
l4_proto = fill_l4_info();
data = packet.data()+(plen-data_size);
}
void drop(){
if (action == FilterAction::NOACTION){
action = FilterAction::DROP;
@@ -129,26 +136,21 @@ class PktRequest {
}
~PktRequest(){
if (ipv4 != nullptr){
delete ipv4;
}
if (ipv6 != nullptr){
delete ipv6;
}
delete ipv4;
delete ipv6;
}
private:
void perfrom_action(){
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh_verdict;
nlh_verdict = nfq_nlmsg_put(buf, NFQNL_MSG_VERDICT, ntohs(nfg->res_id));
struct nlmsghdr *nlh_verdict = nfq_nlmsg_put(buf, NFQNL_MSG_VERDICT, ntohs(res_id));
switch (action)
{
case FilterAction::ACCEPT:
nfq_nlmsg_verdict_put(nlh_verdict, ntohl(ph->packet_id), NF_ACCEPT );
nfq_nlmsg_verdict_put(nlh_verdict, ntohl(packet_id), NF_ACCEPT );
break;
case FilterAction::DROP:
nfq_nlmsg_verdict_put(nlh_verdict, ntohl(ph->packet_id), NF_DROP );
nfq_nlmsg_verdict_put(nlh_verdict, ntohl(packet_id), NF_DROP );
break;
case FilterAction::MANGLE:{
if (is_ipv6){
@@ -156,7 +158,7 @@ class PktRequest {
}else{
nfq_nlmsg_verdict_put_pkt(nlh_verdict, ipv4->serialize().data(), ipv4->size());
}
nfq_nlmsg_verdict_put(nlh_verdict, ntohl(ph->packet_id), NF_ACCEPT );
nfq_nlmsg_verdict_put(nlh_verdict, ntohl(packet_id), NF_ACCEPT );
break;
}
default:
@@ -172,7 +174,6 @@ class PktRequest {
struct internal_nfqueue_execution_data_tmp{
mnl_socket* nl = nullptr;
void *data = nullptr;
shared_ptr<char[]> packet_buffer;
};
const size_t NFQUEUE_BUFFER_SIZE = 0xffff + (MNL_SOCKET_BUFFER_SIZE/2);
@@ -185,10 +186,11 @@ class NfQueue {
mnl_socket* nl = nullptr;
unsigned int portid;
public:
char* queue_msg_buffer = nullptr;
const uint16_t queue_num;
NfQueue(u_int16_t queue_num): queue_num(queue_num) {
queue_msg_buffer = new char[NFQUEUE_BUFFER_SIZE];
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == nullptr) { throw runtime_error( "mnl_socket_open" );}
@@ -199,18 +201,16 @@ class NfQueue {
}
portid = mnl_socket_get_portid(nl);
char queue_msg_buffer[NFQUEUE_BUFFER_SIZE];
if (_send_config_cmd(NFQNL_CFG_CMD_BIND, queue_msg_buffer) < 0) {
if (_send_config_cmd(NFQNL_CFG_CMD_BIND) < 0) {
_clear();
throw runtime_error( "mnl_socket_send" );
}
//TEST if BIND was successful
if (_send_config_cmd(NFQNL_CFG_CMD_NONE, queue_msg_buffer) < 0) { // SEND A NONE command to generate an error meessage
if (_send_config_cmd(NFQNL_CFG_CMD_NONE) < 0) { // SEND A NONE command to generate an error meessage
_clear();
throw runtime_error( "mnl_socket_send" );
}
if (_recv_packet(queue_msg_buffer) == -1) { //RECV the error message
if (_recv_packet() == -1) { //RECV the error message
_clear();
throw runtime_error( "mnl_socket_recvfrom" );
}
@@ -237,9 +237,18 @@ class NfQueue {
nlh = nfq_nlmsg_put(queue_msg_buffer, NFQNL_MSG_CONFIG, queue_num);
nfq_nlmsg_cfg_put_params(nlh, NFQNL_COPY_PACKET, 0xffff);
#ifdef NFQUEUE_FAIL_OPEN
mnl_attr_put_u32(nlh, NFQA_CFG_FLAGS, htonl(NFQA_CFG_F_GSO|NFQA_CFG_F_FAIL_OPEN));
mnl_attr_put_u32(nlh, NFQA_CFG_MASK, htonl(NFQA_CFG_F_GSO|NFQA_CFG_F_FAIL_OPEN));
#else
mnl_attr_put_u32(nlh, NFQA_CFG_FLAGS, htonl(NFQA_CFG_F_GSO));
mnl_attr_put_u32(nlh, NFQA_CFG_MASK, htonl(NFQA_CFG_F_GSO));
#endif
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
_clear();
throw runtime_error( "mnl_socket_send" );
@@ -256,18 +265,16 @@ class NfQueue {
}
void handle_next_packet(D* data){
auto queue_msg_buffer = make_shared<char[]>(NFQUEUE_BUFFER_SIZE);
int ret = _recv_packet(queue_msg_buffer.get(), NFQUEUE_BUFFER_SIZE);
int ret = _recv_packet();
if (ret == -1) {
throw runtime_error( "mnl_socket_recvfrom" );
}
internal_nfqueue_execution_data_tmp raw_ptr = {
nl: nl,
data: data,
packet_buffer: queue_msg_buffer
data: data
};
ret = mnl_cb_run(queue_msg_buffer.get(), ret, 0, portid, _real_queue_cb, &raw_ptr);
ret = mnl_cb_run(queue_msg_buffer, ret, 0, portid, _real_queue_cb, &raw_ptr);
if (ret <= 0){
cerr << "[error] [NfQueue.handle_next_packet] mnl_cb_run error with: " << ret << endl;
throw runtime_error( "mnl_cb_run error!" );
@@ -275,22 +282,12 @@ class NfQueue {
}
~NfQueue() {
char queue_msg_buffer[NFQUEUE_BUFFER_SIZE];
_send_config_cmd(NFQNL_CFG_CMD_UNBIND, queue_msg_buffer);
_send_config_cmd(NFQNL_CFG_CMD_UNBIND);
_clear();
}
private:
template<typename T, typename = enable_if_t<is_base_of_v<Tins::PDU, T>>>
static void inline _send_verdict(shared_ptr<char[]> raw_buf, T* packet, char *payload, uint16_t plen, nfgenmsg *nfg, nfqnl_msg_packet_hdr *ph, internal_nfqueue_execution_data_tmp* ctx, bool is_input){
handle_func(new PktRequest<D>(
raw_buf, packet, payload, plen,
stream_id::make_identifier(*packet),
(D*)ctx->data, ctx->nl, nfg, ph, is_input
));
}
static int _real_queue_cb(const nlmsghdr *nlh, void *data_ptr) {
internal_nfqueue_execution_data_tmp* info = (internal_nfqueue_execution_data_tmp*) data_ptr;
@@ -320,12 +317,10 @@ class NfQueue {
struct nfgenmsg *nfg = (nfgenmsg *)mnl_nlmsg_get_payload(nlh);
bool is_input = ntohl(mnl_attr_get_u32(attr[NFQA_MARK])) & 0x1; // == 0x1337 that is odd
// Check IP protocol version
if ( (payload[0] & 0xf0) == 0x40 ){
_send_verdict(info->packet_buffer, new Tins::IP((uint8_t*)payload, plen), payload, plen, nfg, ph, info, is_input);
}else{
_send_verdict(info->packet_buffer, new Tins::IPv6((uint8_t*)payload, plen), payload, plen, nfg, ph, info, is_input);
}
handle_func(new PktRequest<D>(
payload, plen, (D*)info->data, info->nl, nfg, ph, is_input
));
return MNL_CB_OK;
}
@@ -334,16 +329,17 @@ class NfQueue {
mnl_socket_close(nl);
nl = nullptr;
}
delete[] queue_msg_buffer;
}
inline ssize_t _send_config_cmd(nfqnl_msg_config_cmds cmd, char* buf){
struct nlmsghdr *nlh = nfq_nlmsg_put(buf, NFQNL_MSG_CONFIG, queue_num);
inline ssize_t _send_config_cmd(nfqnl_msg_config_cmds cmd){
struct nlmsghdr *nlh = nfq_nlmsg_put(queue_msg_buffer, NFQNL_MSG_CONFIG, queue_num);
nfq_nlmsg_cfg_put_cmd(nlh, AF_INET, cmd);
return mnl_socket_sendto(nl, nlh, nlh->nlmsg_len);
}
inline ssize_t _recv_packet(char* buf, size_t buf_size = NFQUEUE_BUFFER_SIZE){
return mnl_socket_recvfrom(nl, buf, buf_size);
inline ssize_t _recv_packet(){
return mnl_socket_recvfrom(nl, queue_msg_buffer, NFQUEUE_BUFFER_SIZE);
}
};