Adding upstream version 1.2.6.upstream/1.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 164 insertions, 0 deletions

diff --git a/src/common.c b/src/common.c
new file mode 100644
index 0000000..ec84fa0
--- /dev/null
+++ b/src/common.c
@@ -0,0 +1,164 @@
+/*
+ * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <time.h>
+#include <arpa/inet.h>
+#include <linux/netlink.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/common.h>
+#include <libnftnl/set.h>
+
+#include <errno.h>
+#include "internal.h"
+
+static struct nlmsghdr *__nftnl_nlmsg_build_hdr(char *buf, uint16_t type,
+						uint16_t family,
+						uint16_t flags, uint32_t seq,
+						uint16_t res_id)
+{
+	struct nlmsghdr *nlh;
+	struct nfgenmsg *nfh;
+
+	nlh = mnl_nlmsg_put_header(buf);
+	nlh->nlmsg_type = type;
+	nlh->nlmsg_flags = NLM_F_REQUEST | flags;
+	nlh->nlmsg_seq = seq;
+
+	nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg));
+	nfh->nfgen_family = family;
+	nfh->version = NFNETLINK_V0;
+	nfh->res_id = htons(res_id);
+
+	return nlh;
+}
+
+EXPORT_SYMBOL(nftnl_nlmsg_build_hdr);
+struct nlmsghdr *nftnl_nlmsg_build_hdr(char *buf, uint16_t type, uint16_t family,
+				       uint16_t flags, uint32_t seq)
+{
+	return __nftnl_nlmsg_build_hdr(buf, (NFNL_SUBSYS_NFTABLES << 8) | type,
+				       family, flags, seq, 0);
+}
+
+EXPORT_SYMBOL(nftnl_parse_err_alloc);
+struct nftnl_parse_err *nftnl_parse_err_alloc(void)
+{
+	struct nftnl_parse_err *err;
+
+	err = calloc(1, sizeof(struct nftnl_parse_err));
+	if (err == NULL)
+		return NULL;
+
+	err->error = NFTNL_PARSE_EOPNOTSUPP;
+
+	return err;
+}
+
+EXPORT_SYMBOL(nftnl_parse_err_free);
+void nftnl_parse_err_free(struct nftnl_parse_err *err)
+{
+	xfree(err);
+}
+
+EXPORT_SYMBOL(nftnl_parse_perror);
+int nftnl_parse_perror(const char *msg, struct nftnl_parse_err *err)
+{
+	switch (err->error) {
+	case NFTNL_PARSE_EBADINPUT:
+		return fprintf(stderr, "%s: Bad input format in line %d column %d\n",
+			       msg, err->line, err->column);
+	case NFTNL_PARSE_EMISSINGNODE:
+		return fprintf(stderr, "%s: Node \"%s\" not found\n",
+			       msg, err->node_name);
+	case NFTNL_PARSE_EBADTYPE:
+		return fprintf(stderr, "%s: Invalid type in node \"%s\"\n",
+			       msg, err->node_name);
+	case NFTNL_PARSE_EOPNOTSUPP:
+		return fprintf(stderr, "%s: Operation not supported\n", msg);
+	default:
+		return fprintf(stderr, "%s: Undefined error\n", msg);
+	}
+}
+
+EXPORT_SYMBOL(nftnl_batch_begin);
+struct nlmsghdr *nftnl_batch_begin(char *buf, uint32_t seq)
+{
+	return __nftnl_nlmsg_build_hdr(buf, NFNL_MSG_BATCH_BEGIN, AF_UNSPEC,
+				       0, seq, NFNL_SUBSYS_NFTABLES);
+}
+
+EXPORT_SYMBOL(nftnl_batch_end);
+struct nlmsghdr *nftnl_batch_end(char *buf, uint32_t seq)
+{
+	return __nftnl_nlmsg_build_hdr(buf, NFNL_MSG_BATCH_END, AF_UNSPEC,
+				       0, seq, NFNL_SUBSYS_NFTABLES);
+}
+
+EXPORT_SYMBOL(nftnl_batch_is_supported);
+int nftnl_batch_is_supported(void)
+{
+	struct mnl_socket *nl;
+	struct mnl_nlmsg_batch *b;
+	char buf[MNL_SOCKET_BUFFER_SIZE];
+	uint32_t seq = time(NULL), req_seq;
+	int ret;
+
+	nl = mnl_socket_open(NETLINK_NETFILTER);
+	if (nl == NULL)
+		return -1;
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
+		return -1;
+
+	b = mnl_nlmsg_batch_start(buf, sizeof(buf));
+
+	nftnl_batch_begin(mnl_nlmsg_batch_current(b), seq++);
+	mnl_nlmsg_batch_next(b);
+
+	req_seq = seq;
+	nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(b), NFT_MSG_NEWSET,
+			      AF_INET, NLM_F_ACK, seq++);
+	mnl_nlmsg_batch_next(b);
+
+	nftnl_batch_end(mnl_nlmsg_batch_current(b), seq++);
+	mnl_nlmsg_batch_next(b);
+
+	ret = mnl_socket_sendto(nl, mnl_nlmsg_batch_head(b),
+				mnl_nlmsg_batch_size(b));
+	if (ret < 0)
+		goto err;
+
+	mnl_nlmsg_batch_stop(b);
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	while (ret > 0) {
+		ret = mnl_cb_run(buf, ret, req_seq, mnl_socket_get_portid(nl),
+				 NULL, NULL);
+		if (ret <= 0)
+			break;
+
+		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	}
+	mnl_socket_close(nl);
+
+	/* We're sending an incomplete message to see if the kernel supports
+	 * set messages in batches. EINVAL means that we sent an incomplete
+	 * message with missing attributes. The kernel just ignores messages
+	 * that we cannot include in the batch.
+	 */
+	return (ret == -1 && errno == EINVAL) ? 1 : 0;
+err:
+	mnl_nlmsg_batch_stop(b);
+	return -1;
+}