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#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,
.snprintf = nftnl_obj_synproxy_snprintf,
};
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