Adding upstream version 1.2.6.upstream/1.2.6upstream

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

1 files changed, 156 insertions, 0 deletions

diff --git a/src/expr/synproxy.c b/src/expr/synproxy.c
new file mode 100644
index 0000000..47fcaef
--- /dev/null
+++ b/src/expr/synproxy.c
@@ -0,0 +1,156 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_synproxy {
+	uint16_t	mss;
+	uint8_t		wscale;
+	uint32_t	flags;
+};
+
+static int nftnl_expr_synproxy_set(struct nftnl_expr *e, uint16_t type,
+				   const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_synproxy *synproxy = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_SYNPROXY_MSS:
+		memcpy(&synproxy->mss, data, sizeof(synproxy->mss));
+		break;
+	case NFTNL_EXPR_SYNPROXY_WSCALE:
+		memcpy(&synproxy->wscale, data, sizeof(synproxy->wscale));
+		break;
+	case NFTNL_EXPR_SYNPROXY_FLAGS:
+		memcpy(&synproxy->flags, data, sizeof(synproxy->flags));
+		break;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_synproxy_get(const struct nftnl_expr *e, uint16_t type,
+			uint32_t *data_len)
+{
+	struct nftnl_expr_synproxy *synproxy = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_SYNPROXY_MSS:
+		*data_len = sizeof(synproxy->mss);
+		return &synproxy->mss;
+	case NFTNL_EXPR_SYNPROXY_WSCALE:
+		*data_len = sizeof(synproxy->wscale);
+		return &synproxy->wscale;
+	case NFTNL_EXPR_SYNPROXY_FLAGS:
+		*data_len = sizeof(synproxy->flags);
+		return &synproxy->flags;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_synproxy_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, NFTA_SYNPROXY_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTNL_EXPR_SYNPROXY_MSS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+			abi_breakage();
+		break;
+
+	case NFTNL_EXPR_SYNPROXY_WSCALE:
+		if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+			abi_breakage();
+		break;
+
+	case NFTNL_EXPR_SYNPROXY_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_synproxy_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_synproxy *synproxy = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_SYNPROXY_MSS))
+		mnl_attr_put_u16(nlh, NFTNL_EXPR_SYNPROXY_MSS,
+				 htons(synproxy->mss));
+	if (e->flags & (1 << NFTNL_EXPR_SYNPROXY_WSCALE))
+		mnl_attr_put_u8(nlh, NFTNL_EXPR_SYNPROXY_WSCALE,
+				synproxy->wscale);
+	if (e->flags & (1 << NFTNL_EXPR_SYNPROXY_FLAGS))
+		mnl_attr_put_u32(nlh, NFTNL_EXPR_SYNPROXY_FLAGS,
+				 htonl(synproxy->flags));
+}
+
+static int
+nftnl_expr_synproxy_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_synproxy *synproxy = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_SYNPROXY_MAX + 1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_synproxy_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_SYNPROXY_MSS]) {
+		synproxy->mss = ntohs(mnl_attr_get_u16(tb[NFTA_SYNPROXY_MSS]));
+		e->flags |= (1 << NFTNL_EXPR_SYNPROXY_MSS);
+	}
+
+	if (tb[NFTA_SYNPROXY_WSCALE]) {
+		synproxy->wscale = mnl_attr_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
+		e->flags |= (1 << NFTNL_EXPR_SYNPROXY_WSCALE);
+	}
+
+	if (tb[NFTA_SYNPROXY_FLAGS]) {
+		synproxy->flags = ntohl(mnl_attr_get_u32(tb[NFTA_SYNPROXY_FLAGS]));
+		e->flags |= (1 << NFTNL_EXPR_SYNPROXY_FLAGS);
+	}
+
+	return 0;
+}
+
+static int
+nftnl_expr_synproxy_snprintf(char *buf, size_t len,
+			     uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_synproxy *synproxy = nftnl_expr_data(e);
+	int ret, offset = 0;
+
+	if (e->flags & (1 << NFTNL_EXPR_SYNPROXY_MSS) &&
+	    e->flags & (1 << NFTNL_EXPR_SYNPROXY_WSCALE)) {
+		ret = snprintf(buf, len, "mss %u wscale %u ", synproxy->mss,
+			       synproxy->wscale);
+		SNPRINTF_BUFFER_SIZE(ret, len, offset);
+	}
+
+	return offset;
+}
+
+struct expr_ops expr_ops_synproxy = {
+	.name		= "synproxy",
+	.alloc_len	= sizeof(struct nftnl_expr_synproxy),
+	.max_attr	= NFTA_SYNPROXY_MAX,
+	.set		= nftnl_expr_synproxy_set,
+	.get		= nftnl_expr_synproxy_get,
+	.parse		= nftnl_expr_synproxy_parse,
+	.build		= nftnl_expr_synproxy_build,
+	.output		= nftnl_expr_synproxy_snprintf,
+};