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-rw-r--r--iptables/nft.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/iptables/nft.c b/iptables/nft.c
index 8b14daea..f1deb82f 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -88,11 +88,11 @@ int mnl_talk(struct nft_handle *h, struct nlmsghdr *nlh,
#define NFT_NLMSG_MAXSIZE (UINT16_MAX + getpagesize())
-/* selected batch page is 256 Kbytes long to load ruleset of
- * half a million rules without hitting -EMSGSIZE due to large
- * iovec.
+/* Selected batch page is 2 Mbytes long to support loading a ruleset of 3.5M
+ * rules matching on source and destination address as well as input and output
+ * interfaces. This is what legacy iptables supports.
*/
-#define BATCH_PAGE_SIZE getpagesize() * 32
+#define BATCH_PAGE_SIZE 2 * 1024 * 1024
static struct nftnl_batch *mnl_batch_init(void)
{
@@ -220,8 +220,10 @@ static int mnl_batch_talk(struct nft_handle *h, int numcmds)
int err = 0;
ret = mnl_nft_socket_sendmsg(h, numcmds);
- if (ret == -1)
+ if (ret == -1) {
+ fprintf(stderr, "sendmsg() failed: %s\n", strerror(errno));
return -1;
+ }
FD_ZERO(&readfds);
FD_SET(fd, &readfds);