--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <arpa/inet.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_queue.h>
+
+struct options {
+ bool count_packets;
+ int verbose;
+ unsigned int queue_num;
+ unsigned int timeout;
+};
+
+static unsigned int queue_stats[5];
+static struct options opts;
+
+static void help(const char *p)
+{
+ printf("Usage: %s [-c|-v [-vv] ] [-t timeout] [-q queue_num]\n", p);
+}
+
+static int parse_attr_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = data;
+ int type = mnl_attr_get_type(attr);
+
+ /* skip unsupported attribute in user-space */
+ if (mnl_attr_type_valid(attr, NFQA_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFQA_MARK:
+ case NFQA_IFINDEX_INDEV:
+ case NFQA_IFINDEX_OUTDEV:
+ case NFQA_IFINDEX_PHYSINDEV:
+ case NFQA_IFINDEX_PHYSOUTDEV:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+ perror("mnl_attr_validate");
+ return MNL_CB_ERROR;
+ }
+ break;
+ case NFQA_TIMESTAMP:
+ if (mnl_attr_validate2(attr, MNL_TYPE_UNSPEC,
+ sizeof(struct nfqnl_msg_packet_timestamp)) < 0) {
+ perror("mnl_attr_validate2");
+ return MNL_CB_ERROR;
+ }
+ break;
+ case NFQA_HWADDR:
+ if (mnl_attr_validate2(attr, MNL_TYPE_UNSPEC,
+ sizeof(struct nfqnl_msg_packet_hw)) < 0) {
+ perror("mnl_attr_validate2");
+ return MNL_CB_ERROR;
+ }
+ break;
+ case NFQA_PAYLOAD:
+ break;
+ }
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static int queue_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nlattr *tb[NFQA_MAX+1] = { 0 };
+ struct nfqnl_msg_packet_hdr *ph = NULL;
+ uint32_t id = 0;
+
+ (void)data;
+
+ mnl_attr_parse(nlh, sizeof(struct nfgenmsg), parse_attr_cb, tb);
+ if (tb[NFQA_PACKET_HDR]) {
+ ph = mnl_attr_get_payload(tb[NFQA_PACKET_HDR]);
+ id = ntohl(ph->packet_id);
+
+ if (opts.verbose > 0)
+ printf("packet hook=%u, hwproto 0x%x",
+ ntohs(ph->hw_protocol), ph->hook);
+
+ if (ph->hook >= 5) {
+ fprintf(stderr, "Unknown hook %d\n", ph->hook);
+ return MNL_CB_ERROR;
+ }
+
+ if (opts.verbose > 0) {
+ uint32_t skbinfo = 0;
+
+ if (tb[NFQA_SKB_INFO])
+ skbinfo = ntohl(mnl_attr_get_u32(tb[NFQA_SKB_INFO]));
+ if (skbinfo & NFQA_SKB_CSUMNOTREADY)
+ printf(" csumnotready");
+ if (skbinfo & NFQA_SKB_GSO)
+ printf(" gso");
+ if (skbinfo & NFQA_SKB_CSUM_NOTVERIFIED)
+ printf(" csumnotverified");
+ puts("");
+ }
+
+ if (opts.count_packets)
+ queue_stats[ph->hook]++;
+ }
+
+ return MNL_CB_OK + id;
+}
+
+static struct nlmsghdr *
+nfq_build_cfg_request(char *buf, uint8_t command, int queue_num)
+{
+ struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
+ struct nfqnl_msg_config_cmd cmd = {
+ .command = command,
+ .pf = htons(AF_INET),
+ };
+ struct nfgenmsg *nfg;
+
+ nlh->nlmsg_type = (NFNL_SUBSYS_QUEUE << 8) | NFQNL_MSG_CONFIG;
+ nlh->nlmsg_flags = NLM_F_REQUEST;
+
+ nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
+
+ nfg->nfgen_family = AF_UNSPEC;
+ nfg->version = NFNETLINK_V0;
+ nfg->res_id = htons(queue_num);
+
+ mnl_attr_put(nlh, NFQA_CFG_CMD, sizeof(cmd), &cmd);
+
+ return nlh;
+}
+
+static struct nlmsghdr *
+nfq_build_cfg_params(char *buf, uint8_t mode, int range, int queue_num)
+{
+ struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
+ struct nfqnl_msg_config_params params = {
+ .copy_range = htonl(range),
+ .copy_mode = mode,
+ };
+ struct nfgenmsg *nfg;
+
+ nlh->nlmsg_type = (NFNL_SUBSYS_QUEUE << 8) | NFQNL_MSG_CONFIG;
+ nlh->nlmsg_flags = NLM_F_REQUEST;
+
+ nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
+ nfg->nfgen_family = AF_UNSPEC;
+ nfg->version = NFNETLINK_V0;
+ nfg->res_id = htons(queue_num);
+
+ mnl_attr_put(nlh, NFQA_CFG_PARAMS, sizeof(params), ¶ms);
+
+ return nlh;
+}
+
+static struct nlmsghdr *
+nfq_build_verdict(char *buf, int id, int queue_num, int verd)
+{
+ struct nfqnl_msg_verdict_hdr vh = {
+ .verdict = htonl(verd),
+ .id = htonl(id),
+ };
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfg;
+
+ nlh = mnl_nlmsg_put_header(buf);
+ nlh->nlmsg_type = (NFNL_SUBSYS_QUEUE << 8) | NFQNL_MSG_VERDICT;
+ nlh->nlmsg_flags = NLM_F_REQUEST;
+ nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
+ nfg->nfgen_family = AF_UNSPEC;
+ nfg->version = NFNETLINK_V0;
+ nfg->res_id = htons(queue_num);
+
+ mnl_attr_put(nlh, NFQA_VERDICT_HDR, sizeof(vh), &vh);
+
+ return nlh;
+}
+
+static void print_stats(void)
+{
+ unsigned int last, total;
+ int i;
+
+ if (!opts.count_packets)
+ return;
+
+ total = 0;
+ last = queue_stats[0];
+
+ for (i = 0; i < 5; i++) {
+ printf("hook %d packets %08u\n", i, queue_stats[i]);
+ last = queue_stats[i];
+ total += last;
+ }
+
+ printf("%u packets total\n", total);
+}
+
+struct mnl_socket *open_queue(void)
+{
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ unsigned int queue_num;
+ struct mnl_socket *nl;
+ struct nlmsghdr *nlh;
+ struct timeval tv;
+ uint32_t flags;
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+
+ queue_num = opts.queue_num;
+ nlh = nfq_build_cfg_request(buf, NFQNL_CFG_CMD_BIND, queue_num);
+
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_sendto");
+ exit(EXIT_FAILURE);
+ }
+
+ nlh = nfq_build_cfg_params(buf, NFQNL_COPY_PACKET, 0xFFFF, queue_num);
+
+ flags = NFQA_CFG_F_GSO | NFQA_CFG_F_UID_GID;
+ mnl_attr_put_u32(nlh, NFQA_CFG_FLAGS, htonl(flags));
+ mnl_attr_put_u32(nlh, NFQA_CFG_MASK, htonl(flags));
+
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_sendto");
+ exit(EXIT_FAILURE);
+ }
+
+ memset(&tv, 0, sizeof(tv));
+ tv.tv_sec = opts.timeout;
+ if (opts.timeout && setsockopt(mnl_socket_get_fd(nl),
+ SOL_SOCKET, SO_RCVTIMEO,
+ &tv, sizeof(tv))) {
+ perror("setsockopt(SO_RCVTIMEO)");
+ exit(EXIT_FAILURE);
+ }
+
+ return nl;
+}
+
+static int mainloop(void)
+{
+ unsigned int buflen = 64 * 1024 + MNL_SOCKET_BUFFER_SIZE;
+ struct mnl_socket *nl;
+ struct nlmsghdr *nlh;
+ unsigned int portid;
+ char *buf;
+ int ret;
+
+ buf = malloc(buflen);
+ if (!buf) {
+ perror("malloc");
+ exit(EXIT_FAILURE);
+ }
+
+ nl = open_queue();
+ portid = mnl_socket_get_portid(nl);
+
+ for (;;) {
+ uint32_t id;
+
+ ret = mnl_socket_recvfrom(nl, buf, buflen);
+ if (ret == -1) {
+ if (errno == ENOBUFS)
+ continue;
+
+ if (errno == EAGAIN) {
+ errno = 0;
+ ret = 0;
+ break;
+ }
+
+ perror("mnl_socket_recvfrom");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_cb_run(buf, ret, 0, portid, queue_cb, NULL);
+ if (ret < 0) {
+ perror("mnl_cb_run");
+ exit(EXIT_FAILURE);
+ }
+
+ id = ret - MNL_CB_OK;
+ nlh = nfq_build_verdict(buf, id, opts.queue_num, NF_ACCEPT);
+ if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+ perror("mnl_socket_sendto");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ mnl_socket_close(nl);
+
+ return ret;
+}
+
+static void parse_opts(int argc, char **argv)
+{
+ int c;
+
+ while ((c = getopt(argc, argv, "chvt:q:")) != -1) {
+ switch (c) {
+ case 'c':
+ opts.count_packets = true;
+ break;
+ case 'h':
+ help(argv[0]);
+ exit(0);
+ break;
+ case 'q':
+ opts.queue_num = atoi(optarg);
+ if (opts.queue_num > 0xffff)
+ opts.queue_num = 0;
+ break;
+ case 't':
+ opts.timeout = atoi(optarg);
+ break;
+ case 'v':
+ opts.verbose++;
+ break;
+ }
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ int ret;
+
+ parse_opts(argc, argv);
+
+ ret = mainloop();
+ if (opts.count_packets)
+ print_stats();
+
+ return ret;
+}
--- /dev/null
+#!/bin/bash
+#
+# This tests nf_queue:
+# 1. can process packets from all hooks
+# 2. support running nfqueue from more than one base chain
+#
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+ret=0
+
+sfx=$(mktemp -u "XXXXXXXX")
+ns1="ns1-$sfx"
+ns2="ns2-$sfx"
+nsrouter="nsrouter-$sfx"
+
+cleanup()
+{
+ ip netns del ${ns1}
+ ip netns del ${ns2}
+ ip netns del ${nsrouter}
+ rm -f "$TMPFILE0"
+ rm -f "$TMPFILE1"
+}
+
+nft --version > /dev/null 2>&1
+if [ $? -ne 0 ];then
+ echo "SKIP: Could not run test without nft tool"
+ exit $ksft_skip
+fi
+
+ip -Version > /dev/null 2>&1
+if [ $? -ne 0 ];then
+ echo "SKIP: Could not run test without ip tool"
+ exit $ksft_skip
+fi
+
+ip netns add ${nsrouter}
+if [ $? -ne 0 ];then
+ echo "SKIP: Could not create net namespace"
+ exit $ksft_skip
+fi
+
+TMPFILE0=$(mktemp)
+TMPFILE1=$(mktemp)
+trap cleanup EXIT
+
+ip netns add ${ns1}
+ip netns add ${ns2}
+
+ip link add veth0 netns ${nsrouter} type veth peer name eth0 netns ${ns1} > /dev/null 2>&1
+if [ $? -ne 0 ];then
+ echo "SKIP: No virtual ethernet pair device support in kernel"
+ exit $ksft_skip
+fi
+ip link add veth1 netns ${nsrouter} type veth peer name eth0 netns ${ns2}
+
+ip -net ${nsrouter} link set lo up
+ip -net ${nsrouter} link set veth0 up
+ip -net ${nsrouter} addr add 10.0.1.1/24 dev veth0
+ip -net ${nsrouter} addr add dead:1::1/64 dev veth0
+
+ip -net ${nsrouter} link set veth1 up
+ip -net ${nsrouter} addr add 10.0.2.1/24 dev veth1
+ip -net ${nsrouter} addr add dead:2::1/64 dev veth1
+
+ip -net ${ns1} link set lo up
+ip -net ${ns1} link set eth0 up
+
+ip -net ${ns2} link set lo up
+ip -net ${ns2} link set eth0 up
+
+ip -net ${ns1} addr add 10.0.1.99/24 dev eth0
+ip -net ${ns1} addr add dead:1::99/64 dev eth0
+ip -net ${ns1} route add default via 10.0.1.1
+ip -net ${ns1} route add default via dead:1::1
+
+ip -net ${ns2} addr add 10.0.2.99/24 dev eth0
+ip -net ${ns2} addr add dead:2::99/64 dev eth0
+ip -net ${ns2} route add default via 10.0.2.1
+ip -net ${ns2} route add default via dead:2::1
+
+load_ruleset() {
+ local name=$1
+ local prio=$2
+
+ip netns exec ${nsrouter} nft -f - <<EOF
+table inet $name {
+ chain nfq {
+ ip protocol icmp queue bypass
+ icmpv6 type { "echo-request", "echo-reply" } queue num 1 bypass
+ }
+ chain pre {
+ type filter hook prerouting priority $prio; policy accept;
+ jump nfq
+ }
+ chain input {
+ type filter hook input priority $prio; policy accept;
+ jump nfq
+ }
+ chain forward {
+ type filter hook forward priority $prio; policy accept;
+ tcp dport 12345 queue num 2
+ jump nfq
+ }
+ chain output {
+ type filter hook output priority $prio; policy accept;
+ tcp dport 12345 queue num 3
+ jump nfq
+ }
+ chain post {
+ type filter hook postrouting priority $prio; policy accept;
+ jump nfq
+ }
+}
+EOF
+}
+
+load_counter_ruleset() {
+ local prio=$1
+
+ip netns exec ${nsrouter} nft -f - <<EOF
+table inet countrules {
+ chain pre {
+ type filter hook prerouting priority $prio; policy accept;
+ counter
+ }
+ chain input {
+ type filter hook input priority $prio; policy accept;
+ counter
+ }
+ chain forward {
+ type filter hook forward priority $prio; policy accept;
+ counter
+ }
+ chain output {
+ type filter hook output priority $prio; policy accept;
+ counter
+ }
+ chain post {
+ type filter hook postrouting priority $prio; policy accept;
+ counter
+ }
+}
+EOF
+}
+
+test_ping() {
+ ip netns exec ${ns1} ping -c 1 -q 10.0.2.99 > /dev/null
+ if [ $? -ne 0 ];then
+ return 1
+ fi
+
+ ip netns exec ${ns1} ping -c 1 -q dead:2::99 > /dev/null
+ if [ $? -ne 0 ];then
+ return 1
+ fi
+
+ return 0
+}
+
+test_ping_router() {
+ ip netns exec ${ns1} ping -c 1 -q 10.0.2.1 > /dev/null
+ if [ $? -ne 0 ];then
+ return 1
+ fi
+
+ ip netns exec ${ns1} ping -c 1 -q dead:2::1 > /dev/null
+ if [ $? -ne 0 ];then
+ return 1
+ fi
+
+ return 0
+}
+
+test_queue_blackhole() {
+ local proto=$1
+
+ip netns exec ${nsrouter} nft -f - <<EOF
+table $proto blackh {
+ chain forward {
+ type filter hook forward priority 0; policy accept;
+ queue num 600
+ }
+}
+EOF
+ if [ $proto = "ip" ] ;then
+ ip netns exec ${ns1} ping -c 1 -q 10.0.2.99 > /dev/null
+ lret=$?
+ elif [ $proto = "ip6" ]; then
+ ip netns exec ${ns1} ping -c 1 -q dead:2::99 > /dev/null
+ lret=$?
+ else
+ lret=111
+ fi
+
+ # queue without bypass keyword should drop traffic if no listener exists.
+ if [ $lret -eq 0 ];then
+ echo "FAIL: $proto expected failure, got $lret" 1>&2
+ exit 1
+ fi
+
+ ip netns exec ${nsrouter} nft delete table $proto blackh
+ if [ $? -ne 0 ] ;then
+ echo "FAIL: $proto: Could not delete blackh table"
+ exit 1
+ fi
+
+ echo "PASS: $proto: statement with no listener results in packet drop"
+}
+
+test_queue()
+{
+ local expected=$1
+ local last=""
+
+ # spawn nf-queue listeners
+ ip netns exec ${nsrouter} ./nf-queue -c -q 0 -t 3 > "$TMPFILE0" &
+ ip netns exec ${nsrouter} ./nf-queue -c -q 1 -t 3 > "$TMPFILE1" &
+ sleep 1
+ test_ping
+ ret=$?
+ if [ $ret -ne 0 ];then
+ echo "FAIL: netns routing/connectivity with active listener on queue $queue: $ret" 1>&2
+ exit $ret
+ fi
+
+ test_ping_router
+ ret=$?
+ if [ $ret -ne 0 ];then
+ echo "FAIL: netns router unreachable listener on queue $queue: $ret" 1>&2
+ exit $ret
+ fi
+
+ wait
+ ret=$?
+
+ for file in $TMPFILE0 $TMPFILE1; do
+ last=$(tail -n1 "$file")
+ if [ x"$last" != x"$expected packets total" ]; then
+ echo "FAIL: Expected $expected packets total, but got $last" 1>&2
+ cat "$file" 1>&2
+
+ ip netns exec ${nsrouter} nft list ruleset
+ exit 1
+ fi
+ done
+
+ echo "PASS: Expected and received $last"
+}
+
+test_tcp_forward()
+{
+ ip netns exec ${nsrouter} ./nf-queue -q 2 -t 10 &
+ local nfqpid=$!
+
+ tmpfile=$(mktemp) || exit 1
+ dd conv=sparse status=none if=/dev/zero bs=1M count=100 of=$tmpfile
+ ip netns exec ${ns2} nc -w 5 -l -p 12345 <"$tmpfile" >/dev/null &
+ local rpid=$!
+
+ sleep 1
+ ip netns exec ${ns1} nc -w 5 10.0.2.99 12345 <"$tmpfile" >/dev/null &
+
+ rm -f "$tmpfile"
+
+ wait $rpid
+ wait $lpid
+ [ $? -eq 0 ] && echo "PASS: tcp and nfqueue in forward chain"
+}
+
+test_tcp_localhost()
+{
+ tc -net "${nsrouter}" qdisc add dev lo root netem loss random 1%
+
+ tmpfile=$(mktemp) || exit 1
+
+ dd conv=sparse status=none if=/dev/zero bs=1M count=900 of=$tmpfile
+ ip netns exec ${nsrouter} nc -w 5 -l -p 12345 <"$tmpfile" >/dev/null &
+ local rpid=$!
+
+ ip netns exec ${nsrouter} ./nf-queue -q 3 -t 30 &
+ local nfqpid=$!
+
+ sleep 1
+ ip netns exec ${nsrouter} nc -w 5 127.0.0.1 12345 <"$tmpfile" > /dev/null
+ rm -f "$tmpfile"
+
+ wait $rpid
+ [ $? -eq 0 ] && echo "PASS: tcp via loopback"
+}
+
+ip netns exec ${nsrouter} sysctl net.ipv6.conf.all.forwarding=1 > /dev/null
+ip netns exec ${nsrouter} sysctl net.ipv4.conf.veth0.forwarding=1 > /dev/null
+ip netns exec ${nsrouter} sysctl net.ipv4.conf.veth1.forwarding=1 > /dev/null
+
+load_ruleset "filter" 0
+
+sleep 3
+
+test_ping
+ret=$?
+if [ $ret -eq 0 ];then
+ # queue bypass works (rules were skipped, no listener)
+ echo "PASS: ${ns1} can reach ${ns2}"
+else
+ echo "FAIL: ${ns1} cannot reach ${ns2}: $ret" 1>&2
+ exit $ret
+fi
+
+test_queue_blackhole ip
+test_queue_blackhole ip6
+
+# dummy ruleset to add base chains between the
+# queueing rules. We don't want the second reinject
+# to re-execute the old hooks.
+load_counter_ruleset 10
+
+# we are hooking all: prerouting/input/forward/output/postrouting.
+# we ping ${ns2} from ${ns1} via ${nsrouter} using ipv4 and ipv6, so:
+# 1x icmp prerouting,forward,postrouting -> 3 queue events (6 incl. reply).
+# 1x icmp prerouting,input,output postrouting -> 4 queue events incl. reply.
+# so we expect that userspace program receives 10 packets.
+test_queue 10
+
+# same. We queue to a second program as well.
+load_ruleset "filter2" 20
+test_queue 20
+
+test_tcp_forward
+test_tcp_localhost
+
+exit $ret
projects / openwrt / staging / blogic.git / commitdiff