From 371c8a8bca2b6862226bc79c13d143e07c1d8fc3 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Tue, 9 Apr 2024 15:04:34 +0200
Subject: Adding upstream version 1.2.6.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/obj/synproxy.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 src/obj/synproxy.c

(limited to 'src/obj/synproxy.c')

diff --git a/src/obj/synproxy.c b/src/obj/synproxy.c
new file mode 100644
index 0000000..baef5c2
--- /dev/null
+++ b/src/obj/synproxy.c
@@ -0,0 +1,147 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+
+#include "obj.h"
+
+static int nftnl_obj_synproxy_set(struct nftnl_obj *e, uint16_t type,
+				  const void *data, uint32_t data_len)
+{
+	struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
+
+	switch (type) {
+	case NFTNL_OBJ_SYNPROXY_MSS:
+		synproxy->mss = *((uint16_t *)data);
+		break;
+	case NFTNL_OBJ_SYNPROXY_WSCALE:
+		synproxy->wscale = *((uint8_t *)data);
+		break;
+	case NFTNL_OBJ_SYNPROXY_FLAGS:
+		synproxy->flags = *((uint32_t *)data);
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *nftnl_obj_synproxy_get(const struct nftnl_obj *e,
+					  uint16_t type, uint32_t *data_len)
+{
+	struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
+
+	switch (type) {
+	case NFTNL_OBJ_SYNPROXY_MSS:
+		*data_len = sizeof(synproxy->mss);
+		return &synproxy->mss;
+	case NFTNL_OBJ_SYNPROXY_WSCALE:
+		*data_len = sizeof(synproxy->wscale);
+		return &synproxy->wscale;
+	case NFTNL_OBJ_SYNPROXY_FLAGS:
+		*data_len = sizeof(synproxy->flags);
+		return &synproxy->flags;
+	}
+	return NULL;
+}
+
+static int nftnl_obj_synproxy_cb(const struct nlattr *attr, void *data)
+{
+	int type = mnl_attr_get_type(attr);
+	const struct nlattr **tb = data;
+
+	if (mnl_attr_type_valid(attr, NFTA_SYNPROXY_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch (type) {
+	case NFTA_SYNPROXY_MSS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
+			abi_breakage();
+		break;
+	case NFTA_SYNPROXY_WSCALE:
+		if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+			abi_breakage();
+		break;
+	case NFTA_SYNPROXY_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void nftnl_obj_synproxy_build(struct nlmsghdr *nlh,
+				     const struct nftnl_obj *e)
+{
+	struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
+
+	if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS))
+		mnl_attr_put_u16(nlh, NFTA_SYNPROXY_MSS, htons(synproxy->mss));
+	if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE))
+		mnl_attr_put_u8(nlh, NFTA_SYNPROXY_WSCALE, synproxy->wscale);
+	if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_SYNPROXY_FLAGS,
+				 htonl(synproxy->flags));
+}
+
+static int nftnl_obj_synproxy_parse(struct nftnl_obj *e, struct nlattr *attr)
+{
+	struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
+	struct nlattr *tb[NFTA_SYNPROXY_MAX + 1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_obj_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_OBJ_SYNPROXY_MSS);
+	}
+	if (tb[NFTA_SYNPROXY_WSCALE]) {
+		synproxy->wscale = mnl_attr_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
+		e->flags |= (1 << NFTNL_OBJ_SYNPROXY_WSCALE);
+	}
+	if (tb[NFTA_SYNPROXY_FLAGS]) {
+		synproxy->flags = ntohl(mnl_attr_get_u32(tb[NFTA_SYNPROXY_FLAGS]));
+		e->flags |= (1 << NFTNL_OBJ_SYNPROXY_FLAGS);
+	}
+
+	return 0;
+}
+
+static int nftnl_obj_synproxy_snprintf(char *buf, size_t len,
+				    uint32_t flags,
+				    const struct nftnl_obj *e)
+{
+	struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
+        int ret, offset = 0;
+
+        if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS) &&
+            e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE)) {
+                ret = snprintf(buf, len, "mss %u wscale %u ", synproxy->mss,
+                               synproxy->wscale);
+                SNPRINTF_BUFFER_SIZE(ret, len, offset);
+        }
+
+        return offset;
+}
+
+struct obj_ops obj_ops_synproxy = {
+	.name		= "synproxy",
+	.type		= NFT_OBJECT_SYNPROXY,
+	.alloc_len	= sizeof(struct nftnl_obj_synproxy),
+	.max_attr	= NFTA_SYNPROXY_MAX,
+	.set		= nftnl_obj_synproxy_set,
+	.get		= nftnl_obj_synproxy_get,
+	.parse		= nftnl_obj_synproxy_parse,
+	.build		= nftnl_obj_synproxy_build,
+	.output		= nftnl_obj_synproxy_snprintf,
+};
-- 
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