1 files changed, 395 insertions, 0 deletions
diff --git a/tools/testing/selftests/netfilter/nf-queue.c b/tools/testing/selftests/netfilter/nf-queue.c
new file mode 100644
index 000000000000..9e56b9d47037
--- /dev/null
+++ b/tools/testing/selftests/netfilter/nf-queue.c
@@ -0,0 +1,395 @@
+// 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;
+	bool gso_enabled;
+	int verbose;
+	unsigned int queue_num;
+	unsigned int timeout;
+	uint32_t verdict;
+	uint32_t delay_ms;
+};
+
+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] [-Qdst_queue ] [ -d ms_delay ] [-G]\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), &params);
+
+	return nlh;
+}
+
+static struct nlmsghdr *
+nfq_build_verdict(char *buf, int id, int queue_num, uint32_t 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;
+
+	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 = opts.gso_enabled ? NFQA_CFG_F_GSO : 0;
+	flags |= 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 void sleep_ms(uint32_t delay)
+{
+	struct timespec ts = { .tv_sec = delay / 1000 };
+
+	delay %= 1000;
+
+	ts.tv_nsec = delay * 1000llu * 1000llu;
+
+	nanosleep(&ts, NULL);
+}
+
+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 || errno == EINTR)
+				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;
+		if (opts.delay_ms)
+			sleep_ms(opts.delay_ms);
+
+		nlh = nfq_build_verdict(buf, id, opts.queue_num, opts.verdict);
+		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:Q:d:G")) != -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 'Q':
+			opts.verdict = atoi(optarg);
+			if (opts.verdict > 0xffff) {
+				fprintf(stderr, "Expected destination queue number\n");
+				exit(1);
+			}
+
+			opts.verdict <<= 16;
+			opts.verdict |= NF_QUEUE;
+			break;
+		case 'd':
+			opts.delay_ms = atoi(optarg);
+			if (opts.delay_ms == 0) {
+				fprintf(stderr, "Expected nonzero delay (in milliseconds)\n");
+				exit(1);
+			}
+			break;
+		case 't':
+			opts.timeout = atoi(optarg);
+			break;
+		case 'G':
+			opts.gso_enabled = false;
+			break;
+		case 'v':
+			opts.verbose++;
+			break;
+		}
+	}
+
+	if (opts.verdict != NF_ACCEPT && (opts.verdict >> 16 == opts.queue_num)) {
+		fprintf(stderr, "Cannot use same destination and source queue\n");
+		exit(1);
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+
+	opts.verdict = NF_ACCEPT;
+	opts.gso_enabled = true;
+
+	parse_opts(argc, argv);
+
+	ret = mainloop();
+	if (opts.count_packets)
+		print_stats();
+
+	return ret;
+}