diff options
-rw-r--r-- | examples/netfilter/Makefile.am | 4 | ||||
-rw-r--r-- | examples/netfilter/nfct-counter.c | 94 |
2 files changed, 98 insertions, 0 deletions
diff --git a/examples/netfilter/Makefile.am b/examples/netfilter/Makefile.am index 644f5cd..1671d1f 100644 --- a/examples/netfilter/Makefile.am +++ b/examples/netfilter/Makefile.am @@ -4,6 +4,7 @@ check_PROGRAMS = nf-queue \ nf-log \ nfct-event \ nfct-dump-stats-cpu \ + nfct-counter \ nfct-create-batch nf_queue_SOURCES = nf-queue.c @@ -18,5 +19,8 @@ nfct_event_LDADD = ../../src/libmnl.la nfct_dump_stats_cpu_SOURCES = nfct-dump-stats-cpu.c nfct_dump_stats_cpu_LDADD = ../../src/libmnl.la +nfct_counter_SOURCES = nfct-counter.c +nfct_counter_LDADD = ../../src/libmnl.la + nfct_create_batch_SOURCES = nfct-create-batch.c nfct_create_batch_LDADD = ../../src/libmnl.la diff --git a/examples/netfilter/nfct-counter.c b/examples/netfilter/nfct-counter.c new file mode 100644 index 0000000..29bb36a --- /dev/null +++ b/examples/netfilter/nfct-counter.c @@ -0,0 +1,94 @@ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <time.h> +#include <arpa/inet.h> + +#include <linux/netfilter/nfnetlink_conntrack.h> +#include <libmnl/libmnl.h> + +static int data_attr_cb(const struct nlattr *attr, void *data) +{ + const struct nlattr **tb = data; + int type = mnl_attr_get_type(attr); + + if (mnl_attr_type_valid(attr, CTA_STATS_GLOBAL_MAX) < 0) + return MNL_CB_OK; + + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) { + perror("mnl_attr_validate"); + return MNL_CB_ERROR; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static int data_cb(const struct nlmsghdr *nlh, void *data) +{ + struct nlattr *tb[CTA_STATS_GLOBAL_MAX+1] = {}; + struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh); + + mnl_attr_parse(nlh, sizeof(*nfg), data_attr_cb, tb); + + if (tb[CTA_STATS_GLOBAL_ENTRIES]) { + int ctr = ntohl(mnl_attr_get_u32(tb[CTA_STATS_GLOBAL_ENTRIES])); + printf("%d\n", ctr); + } + return MNL_CB_OK; +} + +int main(void) +{ + struct mnl_socket *nl; + struct nlmsghdr *nlh; + struct nfgenmsg *nfh; + char buf[MNL_SOCKET_BUFFER_SIZE]; + unsigned int seq, portid; + int ret; + + 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); + } + portid = mnl_socket_get_portid(nl); + + nlh = mnl_nlmsg_put_header(buf); + nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK << 8) | + IPCTNL_MSG_CT_GET_STATS; + nlh->nlmsg_flags = NLM_F_REQUEST; + nlh->nlmsg_seq = seq = time(NULL); + + nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg)); + nfh->nfgen_family = AF_INET; + nfh->version = NFNETLINK_V0; + nfh->res_id = 0; + + ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len); + if (ret == -1) { + perror("mnl_socket_recvfrom"); + exit(EXIT_FAILURE); + } + + ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); + if (ret == -1) { + perror("mnl_socket_recvfrom"); + exit(EXIT_FAILURE); + } + + ret = mnl_cb_run(buf, ret, seq, portid, data_cb, NULL); + if (ret == -1) { + perror("mnl_cb_run"); + exit(EXIT_FAILURE); + } + + mnl_socket_close(nl); + + return 0; +} |