Let's add batching support to this code example. The kernel API only
understand messages in batch format.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
---
examples/nft-set-elem-del.c | 107 ++++++++++++++++++++++++++++++-------------
1 file changed, 74 insertions(+), 33 deletions(-)
diff --git a/examples/nft-set-elem-del.c b/examples/nft-set-elem-del.c
index af70cde..9da6f08 100644
--- a/examples/nft-set-elem-del.c
+++ b/examples/nft-set-elem-del.c
@@ -16,18 +16,64 @@
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter/nfnetlink.h>
#include <libmnl/libmnl.h>
#include <libnftnl/set.h>
+static void setup_set(struct nft_set *s, const char *table, const char *name)
+{
+ uint32_t data;
+ struct nft_set_elem *e;
+
+ nft_set_attr_set(s, NFT_SET_ATTR_TABLE, table);
+ nft_set_attr_set(s, NFT_SET_ATTR_NAME, name);
+
+ /* Add to dummy elements to set */
+ e = nft_set_elem_alloc();
+ if (e == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+
+ data = 0x1;
+ nft_set_elem_attr_set(e, NFT_SET_ELEM_ATTR_KEY, &data, sizeof(data));
+ nft_set_elem_add(s, e);
+
+ e = nft_set_elem_alloc();
+ if (e == NULL) {
+ perror("OOM");
+ exit(EXIT_FAILURE);
+ }
+ data = 0x2;
+ nft_set_elem_attr_set(e, NFT_SET_ELEM_ATTR_KEY, &data, sizeof(data));
+ nft_set_elem_add(s, e);
+}
+
+static void nft_mnl_batch_put(char *buf, uint16_t type, uint32_t seq)
+{
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfg;
+
+ nlh = mnl_nlmsg_put_header(buf);
+ nlh->nlmsg_type = type;
+ nlh->nlmsg_flags = NLM_F_REQUEST;
+ nlh->nlmsg_seq = seq;
+
+ nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
+ nfg->nfgen_family = AF_INET;
+ nfg->version = NFNETLINK_V0;
+ nfg->res_id = NFNL_SUBSYS_NFTABLES;
+}
+
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
+ struct mnl_nlmsg_batch *batch;
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
- uint32_t portid, seq, family, data;
+ uint32_t portid, seq, family;
struct nft_set *s;
- struct nft_set_elem *e;
int ret;
if (argc != 4) {
@@ -55,33 +101,24 @@ int main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
- nft_set_attr_set(s, NFT_SET_ATTR_TABLE, argv[2]);
- nft_set_attr_set(s, NFT_SET_ATTR_NAME, argv[3]);
-
- /* Add to dummy elements to set */
- e = nft_set_elem_alloc();
- if (e == NULL) {
- perror("OOM");
- exit(EXIT_FAILURE);
- }
+ setup_set(s, argv[2], argv[3]);
- data = 0x1;
- nft_set_elem_attr_set(e, NFT_SET_ELEM_ATTR_KEY, &data, sizeof(data));
- nft_set_elem_add(s, e);
+ batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
- e = nft_set_elem_alloc();
- if (e == NULL) {
- perror("OOM");
- exit(EXIT_FAILURE);
- }
- data = 0x2;
- nft_set_elem_attr_set(e, NFT_SET_ELEM_ATTR_KEY, &data, sizeof(data));
- nft_set_elem_add(s, e);
+ nft_mnl_batch_put(mnl_nlmsg_batch_current(batch),
+ NFNL_MSG_BATCH_BEGIN, seq++);
+ mnl_nlmsg_batch_next(batch);
- nlh = nft_set_nlmsg_build_hdr(buf, NFT_MSG_DELSETELEM, family,
- NLM_F_ACK, seq);
+ nlh = nft_set_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+ NFT_MSG_DELSETELEM, family,
+ NLM_F_ACK, seq++);
nft_set_elems_nlmsg_build_payload(nlh, s);
nft_set_free(s);
+ mnl_nlmsg_batch_next(batch);
+
+ nft_mnl_batch_put(mnl_nlmsg_batch_current(batch),
+ NFNL_MSG_BATCH_END, seq++);
+ mnl_nlmsg_batch_next(batch);
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == NULL) {
@@ -95,20 +132,24 @@ int main(int argc, char *argv[])
}
portid = mnl_socket_get_portid(nl);
- if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
- perror("mnl_socket_send");
+ ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+ mnl_nlmsg_batch_size(batch));
+ if (ret == -1) {
+ perror("mnl_socket_sendto");
exit(EXIT_FAILURE);
}
+ mnl_nlmsg_batch_stop(batch);
+
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
- while (ret > 0) {
- ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
- if (ret <= 0)
- break;
- ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
- }
if (ret == -1) {
- perror("error");
+ perror("mnl_socket_recvfrom");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_cb_run(buf, ret, 0, portid, NULL, NULL);
+ if (ret < 0) {
+ perror("mnl_cb_run");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
--
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