examples: nft-table-del: add batching support

Add batching support so this code example works with current kernels.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/examples/nft-table-del.c b/examples/nft-table-del.c
index ae7db27c0360001b53747b35cf377e865c272918..334d20b55b38ec98bce72e7bc5881797ec6790cc 100644 (file)
--- a/examples/nft-table-del.c
+++ b/examples/nft-table-del.c
@@ -55,9 +55,10 @@ int main(int argc, char *argv[])
        struct mnl_socket *nl;
        char buf[MNL_SOCKET_BUFFER_SIZE];
        struct nlmsghdr *nlh;
-       uint32_t portid, seq, family;
+       uint32_t portid, seq, table_seq, family;
        struct nft_table *t;
-       int ret;
+       struct mnl_nlmsg_batch *batch;
+       int ret, batching;
 
        if (argc != 3) {
                fprintf(stderr, "%s <family> <name>\n", argv[0]);
@@ -68,14 +69,34 @@ int main(int argc, char *argv[])
        if (t == NULL)
                exit(EXIT_FAILURE);
 
+       batching = nft_batch_is_supported();
+       if (batching < 0) {
+               perror("cannot talk to nfnetlink");
+               exit(EXIT_FAILURE);
+       }
 
        seq = time(NULL);
+       batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+       if (batching) {
+               nft_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
+               mnl_nlmsg_batch_next(batch);
+       }
+
+       table_seq = seq;
        family = nft_table_attr_get_u32(t, NFT_TABLE_ATTR_FAMILY);
-       nlh = nft_table_nlmsg_build_hdr(buf, NFT_MSG_DELTABLE, family,
-                                       NLM_F_ACK, seq);
+       nlh = nft_table_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
+                                       NFT_MSG_DELTABLE, family,
+                                       NLM_F_ACK, seq++);
        nft_table_nlmsg_build_payload(nlh, t);
+       mnl_nlmsg_batch_next(batch);
        nft_table_free(t);
 
+       if (batching) {
+               nft_batch_end(mnl_nlmsg_batch_current(batch), seq++);
+               mnl_nlmsg_batch_next(batch);
+       }
+
        nl = mnl_socket_open(NETLINK_NETFILTER);
        if (nl == NULL) {
                perror("mnl_socket_open");
@@ -88,14 +109,17 @@ int main(int argc, char *argv[])
        }
        portid = mnl_socket_get_portid(nl);
 
-       if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
+       if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
+                             mnl_nlmsg_batch_size(batch)) < 0) {
                perror("mnl_socket_send");
                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);
+               ret = mnl_cb_run(buf, ret, table_seq, portid, NULL, NULL);
                if (ret <= 0)
                        break;
                ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));