// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include <arpa/inet.h>
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#include <libmnl/libmnl.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nfnetlink_queue.h>
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struct options {
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bool count_packets;
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bool gso_enabled;
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int verbose;
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unsigned int queue_num;
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unsigned int timeout;
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uint32_t verdict;
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uint32_t delay_ms;
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};
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static unsigned int queue_stats[5];
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static struct options opts;
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static void help(const char *p)
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{
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printf("Usage: %s [-c|-v [-vv] ] [-t timeout] [-q queue_num] [-Qdst_queue ] [ -d ms_delay ] [-G]\n", p);
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}
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static int parse_attr_cb(const struct nlattr *attr, void *data)
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{
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const struct nlattr **tb = data;
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int type = mnl_attr_get_type(attr);
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/* skip unsupported attribute in user-space */
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if (mnl_attr_type_valid(attr, NFQA_MAX) < 0)
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return MNL_CB_OK;
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switch (type) {
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case NFQA_MARK:
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case NFQA_IFINDEX_INDEV:
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case NFQA_IFINDEX_OUTDEV:
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case NFQA_IFINDEX_PHYSINDEV:
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case NFQA_IFINDEX_PHYSOUTDEV:
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if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
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perror("mnl_attr_validate");
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return MNL_CB_ERROR;
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}
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break;
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case NFQA_TIMESTAMP:
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if (mnl_attr_validate2(attr, MNL_TYPE_UNSPEC,
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sizeof(struct nfqnl_msg_packet_timestamp)) < 0) {
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perror("mnl_attr_validate2");
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return MNL_CB_ERROR;
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}
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break;
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case NFQA_HWADDR:
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if (mnl_attr_validate2(attr, MNL_TYPE_UNSPEC,
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sizeof(struct nfqnl_msg_packet_hw)) < 0) {
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perror("mnl_attr_validate2");
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return MNL_CB_ERROR;
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}
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break;
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case NFQA_PAYLOAD:
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break;
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}
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tb[type] = attr;
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return MNL_CB_OK;
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}
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static int queue_cb(const struct nlmsghdr *nlh, void *data)
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{
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struct nlattr *tb[NFQA_MAX+1] = { 0 };
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struct nfqnl_msg_packet_hdr *ph = NULL;
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uint32_t id = 0;
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(void)data;
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mnl_attr_parse(nlh, sizeof(struct nfgenmsg), parse_attr_cb, tb);
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if (tb[NFQA_PACKET_HDR]) {
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ph = mnl_attr_get_payload(tb[NFQA_PACKET_HDR]);
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id = ntohl(ph->packet_id);
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if (opts.verbose > 0)
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printf("packet hook=%u, hwproto 0x%x",
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ntohs(ph->hw_protocol), ph->hook);
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if (ph->hook >= 5) {
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fprintf(stderr, "Unknown hook %d\n", ph->hook);
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return MNL_CB_ERROR;
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}
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if (opts.verbose > 0) {
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uint32_t skbinfo = 0;
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if (tb[NFQA_SKB_INFO])
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skbinfo = ntohl(mnl_attr_get_u32(tb[NFQA_SKB_INFO]));
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if (skbinfo & NFQA_SKB_CSUMNOTREADY)
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printf(" csumnotready");
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if (skbinfo & NFQA_SKB_GSO)
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printf(" gso");
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if (skbinfo & NFQA_SKB_CSUM_NOTVERIFIED)
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printf(" csumnotverified");
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puts("");
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}
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if (opts.count_packets)
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queue_stats[ph->hook]++;
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}
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return MNL_CB_OK + id;
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}
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static struct nlmsghdr *
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nfq_build_cfg_request(char *buf, uint8_t command, int queue_num)
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{
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struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
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struct nfqnl_msg_config_cmd cmd = {
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.command = command,
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.pf = htons(AF_INET),
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};
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struct nfgenmsg *nfg;
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nlh->nlmsg_type = (NFNL_SUBSYS_QUEUE << 8) | NFQNL_MSG_CONFIG;
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nlh->nlmsg_flags = NLM_F_REQUEST;
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nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
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nfg->nfgen_family = AF_UNSPEC;
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nfg->version = NFNETLINK_V0;
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nfg->res_id = htons(queue_num);
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mnl_attr_put(nlh, NFQA_CFG_CMD, sizeof(cmd), &cmd);
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return nlh;
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}
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static struct nlmsghdr *
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nfq_build_cfg_params(char *buf, uint8_t mode, int range, int queue_num)
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{
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struct nlmsghdr *nlh = mnl_nlmsg_put_header(buf);
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struct nfqnl_msg_config_params params = {
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.copy_range = htonl(range),
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.copy_mode = mode,
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};
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struct nfgenmsg *nfg;
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nlh->nlmsg_type = (NFNL_SUBSYS_QUEUE << 8) | NFQNL_MSG_CONFIG;
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nlh->nlmsg_flags = NLM_F_REQUEST;
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nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
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nfg->nfgen_family = AF_UNSPEC;
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nfg->version = NFNETLINK_V0;
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nfg->res_id = htons(queue_num);
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mnl_attr_put(nlh, NFQA_CFG_PARAMS, sizeof(params), ¶ms);
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return nlh;
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}
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static struct nlmsghdr *
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nfq_build_verdict(char *buf, int id, int queue_num, uint32_t verd)
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{
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struct nfqnl_msg_verdict_hdr vh = {
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.verdict = htonl(verd),
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.id = htonl(id),
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};
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struct nlmsghdr *nlh;
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struct nfgenmsg *nfg;
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nlh = mnl_nlmsg_put_header(buf);
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nlh->nlmsg_type = (NFNL_SUBSYS_QUEUE << 8) | NFQNL_MSG_VERDICT;
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nlh->nlmsg_flags = NLM_F_REQUEST;
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nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
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nfg->nfgen_family = AF_UNSPEC;
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nfg->version = NFNETLINK_V0;
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nfg->res_id = htons(queue_num);
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mnl_attr_put(nlh, NFQA_VERDICT_HDR, sizeof(vh), &vh);
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return nlh;
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}
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static void print_stats(void)
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{
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unsigned int last, total;
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int i;
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total = 0;
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last = queue_stats[0];
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for (i = 0; i < 5; i++) {
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printf("hook %d packets %08u\n", i, queue_stats[i]);
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last = queue_stats[i];
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total += last;
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}
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printf("%u packets total\n", total);
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}
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struct mnl_socket *open_queue(void)
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{
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char buf[MNL_SOCKET_BUFFER_SIZE];
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unsigned int queue_num;
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struct mnl_socket *nl;
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struct nlmsghdr *nlh;
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struct timeval tv;
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uint32_t flags;
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nl = mnl_socket_open(NETLINK_NETFILTER);
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if (nl == NULL) {
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perror("mnl_socket_open");
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exit(EXIT_FAILURE);
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}
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if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
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perror("mnl_socket_bind");
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exit(EXIT_FAILURE);
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}
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queue_num = opts.queue_num;
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nlh = nfq_build_cfg_request(buf, NFQNL_CFG_CMD_BIND, queue_num);
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if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
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perror("mnl_socket_sendto");
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exit(EXIT_FAILURE);
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}
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nlh = nfq_build_cfg_params(buf, NFQNL_COPY_PACKET, 0xFFFF, queue_num);
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flags = opts.gso_enabled ? NFQA_CFG_F_GSO : 0;
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flags |= NFQA_CFG_F_UID_GID;
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mnl_attr_put_u32(nlh, NFQA_CFG_FLAGS, htonl(flags));
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mnl_attr_put_u32(nlh, NFQA_CFG_MASK, htonl(flags));
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if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
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perror("mnl_socket_sendto");
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exit(EXIT_FAILURE);
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}
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memset(&tv, 0, sizeof(tv));
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tv.tv_sec = opts.timeout;
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if (opts.timeout && setsockopt(mnl_socket_get_fd(nl),
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SOL_SOCKET, SO_RCVTIMEO,
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&tv, sizeof(tv))) {
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perror("setsockopt(SO_RCVTIMEO)");
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exit(EXIT_FAILURE);
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}
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return nl;
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}
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static void sleep_ms(uint32_t delay)
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{
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struct timespec ts = { .tv_sec = delay / 1000 };
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delay %= 1000;
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ts.tv_nsec = delay * 1000llu * 1000llu;
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nanosleep(&ts, NULL);
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}
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static int mainloop(void)
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{
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unsigned int buflen = 64 * 1024 + MNL_SOCKET_BUFFER_SIZE;
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struct mnl_socket *nl;
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struct nlmsghdr *nlh;
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unsigned int portid;
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char *buf;
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int ret;
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buf = malloc(buflen);
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if (!buf) {
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perror("malloc");
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exit(EXIT_FAILURE);
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}
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nl = open_queue();
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portid = mnl_socket_get_portid(nl);
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for (;;) {
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uint32_t id;
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ret = mnl_socket_recvfrom(nl, buf, buflen);
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if (ret == -1) {
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if (errno == ENOBUFS || errno == EINTR)
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continue;
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if (errno == EAGAIN) {
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errno = 0;
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ret = 0;
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break;
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}
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perror("mnl_socket_recvfrom");
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exit(EXIT_FAILURE);
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}
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ret = mnl_cb_run(buf, ret, 0, portid, queue_cb, NULL);
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if (ret < 0) {
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perror("mnl_cb_run");
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exit(EXIT_FAILURE);
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}
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id = ret - MNL_CB_OK;
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if (opts.delay_ms)
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sleep_ms(opts.delay_ms);
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nlh = nfq_build_verdict(buf, id, opts.queue_num, opts.verdict);
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if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
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perror("mnl_socket_sendto");
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exit(EXIT_FAILURE);
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}
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}
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mnl_socket_close(nl);
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return ret;
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}
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static void parse_opts(int argc, char **argv)
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{
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int c;
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while ((c = getopt(argc, argv, "chvt:q:Q:d:G")) != -1) {
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switch (c) {
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case 'c':
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opts.count_packets = true;
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break;
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case 'h':
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help(argv[0]);
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exit(0);
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break;
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case 'q':
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opts.queue_num = atoi(optarg);
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if (opts.queue_num > 0xffff)
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opts.queue_num = 0;
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break;
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case 'Q':
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opts.verdict = atoi(optarg);
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if (opts.verdict > 0xffff) {
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fprintf(stderr, "Expected destination queue number\n");
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exit(1);
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}
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opts.verdict <<= 16;
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opts.verdict |= NF_QUEUE;
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break;
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case 'd':
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opts.delay_ms = atoi(optarg);
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if (opts.delay_ms == 0) {
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fprintf(stderr, "Expected nonzero delay (in milliseconds)\n");
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exit(1);
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}
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break;
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case 't':
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opts.timeout = atoi(optarg);
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break;
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case 'G':
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opts.gso_enabled = false;
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break;
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case 'v':
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opts.verbose++;
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break;
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}
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}
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if (opts.verdict != NF_ACCEPT && (opts.verdict >> 16 == opts.queue_num)) {
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fprintf(stderr, "Cannot use same destination and source queue\n");
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exit(1);
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}
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}
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int main(int argc, char *argv[])
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{
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int ret;
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opts.verdict = NF_ACCEPT;
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opts.gso_enabled = true;
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parse_opts(argc, argv);
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ret = mainloop();
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if (opts.count_packets)
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print_stats();
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return ret;
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}
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