22#include <libmnl/libmnl.h>
23#include <linux/netfilter/nf_tables.h>
24#include <libnftnl/expr.h>
25#include <libnftnl/rule.h>
28 enum nft_registers sreg_addr_min;
29 enum nft_registers sreg_addr_max;
30 enum nft_registers sreg_proto_min;
31 enum nft_registers sreg_proto_max;
33 enum nft_nat_types type;
38nftnl_expr_nat_set(
struct nftnl_expr *e, uint16_t type,
39 const void *data, uint32_t data_len)
44 case NFTNL_EXPR_NAT_TYPE:
45 memcpy(&nat->type, data, data_len);
47 case NFTNL_EXPR_NAT_FAMILY:
48 memcpy(&nat->family, data, data_len);
50 case NFTNL_EXPR_NAT_REG_ADDR_MIN:
51 memcpy(&nat->sreg_addr_min, data, data_len);
53 case NFTNL_EXPR_NAT_REG_ADDR_MAX:
54 memcpy(&nat->sreg_addr_max, data, data_len);
56 case NFTNL_EXPR_NAT_REG_PROTO_MIN:
57 memcpy(&nat->sreg_proto_min, data, data_len);
59 case NFTNL_EXPR_NAT_REG_PROTO_MAX:
60 memcpy(&nat->sreg_proto_max, data, data_len);
62 case NFTNL_EXPR_NAT_FLAGS:
63 memcpy(&nat->flags, data, data_len);
71nftnl_expr_nat_get(
const struct nftnl_expr *e, uint16_t type,
77 case NFTNL_EXPR_NAT_TYPE:
78 *data_len =
sizeof(nat->type);
80 case NFTNL_EXPR_NAT_FAMILY:
81 *data_len =
sizeof(nat->family);
83 case NFTNL_EXPR_NAT_REG_ADDR_MIN:
84 *data_len =
sizeof(nat->sreg_addr_min);
85 return &nat->sreg_addr_min;
86 case NFTNL_EXPR_NAT_REG_ADDR_MAX:
87 *data_len =
sizeof(nat->sreg_addr_max);
88 return &nat->sreg_addr_max;
89 case NFTNL_EXPR_NAT_REG_PROTO_MIN:
90 *data_len =
sizeof(nat->sreg_proto_min);
91 return &nat->sreg_proto_min;
92 case NFTNL_EXPR_NAT_REG_PROTO_MAX:
93 *data_len =
sizeof(nat->sreg_proto_max);
94 return &nat->sreg_proto_max;
95 case NFTNL_EXPR_NAT_FLAGS:
96 *data_len =
sizeof(nat->flags);
102static int nftnl_expr_nat_cb(
const struct nlattr *attr,
void *data)
104 const struct nlattr **tb = data;
105 int type = mnl_attr_get_type(attr);
107 if (mnl_attr_type_valid(attr, NFTA_NAT_MAX) < 0)
112 case NFTA_NAT_FAMILY:
113 case NFTA_NAT_REG_ADDR_MIN:
114 case NFTA_NAT_REG_ADDR_MAX:
115 case NFTA_NAT_REG_PROTO_MIN:
116 case NFTA_NAT_REG_PROTO_MAX:
118 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
128nftnl_expr_nat_parse(
struct nftnl_expr *e,
struct nlattr *attr)
131 struct nlattr *tb[NFTA_NAT_MAX+1] = {};
133 if (mnl_attr_parse_nested(attr, nftnl_expr_nat_cb, tb) < 0)
136 if (tb[NFTA_NAT_TYPE]) {
137 nat->type = ntohl(mnl_attr_get_u32(tb[NFTA_NAT_TYPE]));
138 e->flags |= (1 << NFTNL_EXPR_NAT_TYPE);
140 if (tb[NFTA_NAT_FAMILY]) {
141 nat->family = ntohl(mnl_attr_get_u32(tb[NFTA_NAT_FAMILY]));
142 e->flags |= (1 << NFTNL_EXPR_NAT_FAMILY);
144 if (tb[NFTA_NAT_REG_ADDR_MIN]) {
146 ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_ADDR_MIN]));
147 e->flags |= (1 << NFTNL_EXPR_NAT_REG_ADDR_MIN);
149 if (tb[NFTA_NAT_REG_ADDR_MAX]) {
151 ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_ADDR_MAX]));
152 e->flags |= (1 << NFTNL_EXPR_NAT_REG_ADDR_MAX);
154 if (tb[NFTA_NAT_REG_PROTO_MIN]) {
155 nat->sreg_proto_min =
156 ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_PROTO_MIN]));
157 e->flags |= (1 << NFTNL_EXPR_NAT_REG_PROTO_MIN);
159 if (tb[NFTA_NAT_REG_PROTO_MAX]) {
160 nat->sreg_proto_max =
161 ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_PROTO_MAX]));
162 e->flags |= (1 << NFTNL_EXPR_NAT_REG_PROTO_MAX);
164 if (tb[NFTA_NAT_FLAGS]) {
165 nat->flags = ntohl(mnl_attr_get_u32(tb[NFTA_NAT_FLAGS]));
166 e->flags |= (1 << NFTNL_EXPR_NAT_FLAGS);
173nftnl_expr_nat_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
177 if (e->flags & (1 << NFTNL_EXPR_NAT_TYPE))
178 mnl_attr_put_u32(nlh, NFTA_NAT_TYPE, htonl(nat->type));
179 if (e->flags & (1 << NFTNL_EXPR_NAT_FAMILY))
180 mnl_attr_put_u32(nlh, NFTA_NAT_FAMILY, htonl(nat->family));
181 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MIN))
182 mnl_attr_put_u32(nlh, NFTA_NAT_REG_ADDR_MIN,
183 htonl(nat->sreg_addr_min));
184 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MAX))
185 mnl_attr_put_u32(nlh, NFTA_NAT_REG_ADDR_MAX,
186 htonl(nat->sreg_addr_max));
187 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MIN))
188 mnl_attr_put_u32(nlh, NFTA_NAT_REG_PROTO_MIN,
189 htonl(nat->sreg_proto_min));
190 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MAX))
191 mnl_attr_put_u32(nlh, NFTA_NAT_REG_PROTO_MAX,
192 htonl(nat->sreg_proto_max));
193 if (e->flags & (1 << NFTNL_EXPR_NAT_FLAGS))
194 mnl_attr_put_u32(nlh, NFTA_NAT_FLAGS, htonl(nat->flags));
197static inline const char *nat2str(uint16_t nat)
209static inline int nftnl_str2nat(
const char *nat)
211 if (strcmp(nat,
"snat") == 0)
213 else if (strcmp(nat,
"dnat") == 0)
222nftnl_expr_nat_snprintf(
char *buf,
size_t remain,
223 uint32_t flags,
const struct nftnl_expr *e)
226 int offset = 0, ret = 0;
228 ret = snprintf(buf, remain,
"%s ", nat2str(nat->type));
229 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
231 ret = snprintf(buf + offset, remain,
"%s ",
232 nftnl_family2str(nat->family));
233 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
235 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MIN)) {
236 ret = snprintf(buf + offset, remain,
237 "addr_min reg %u ", nat->sreg_addr_min);
238 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
241 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MAX)) {
242 ret = snprintf(buf + offset, remain,
243 "addr_max reg %u ", nat->sreg_addr_max);
244 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
247 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MIN)) {
248 ret = snprintf(buf + offset, remain,
249 "proto_min reg %u ", nat->sreg_proto_min);
250 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
253 if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MAX)) {
254 ret = snprintf(buf + offset, remain,
255 "proto_max reg %u ", nat->sreg_proto_max);
256 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
259 if (e->flags & (1 << NFTNL_EXPR_NAT_FLAGS)) {
260 ret = snprintf(buf + offset, remain,
"flags 0x%x ", nat->flags);
261 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
267static struct attr_policy nat_attr_policy[__NFTNL_EXPR_NAT_MAX] = {
268 [NFTNL_EXPR_NAT_TYPE] = { .maxlen =
sizeof(uint32_t) },
269 [NFTNL_EXPR_NAT_FAMILY] = { .maxlen =
sizeof(uint32_t) },
270 [NFTNL_EXPR_NAT_REG_ADDR_MIN] = { .maxlen =
sizeof(uint32_t) },
271 [NFTNL_EXPR_NAT_REG_ADDR_MAX] = { .maxlen =
sizeof(uint32_t) },
272 [NFTNL_EXPR_NAT_REG_PROTO_MIN] = { .maxlen =
sizeof(uint32_t) },
273 [NFTNL_EXPR_NAT_REG_PROTO_MAX] = { .maxlen =
sizeof(uint32_t) },
274 [NFTNL_EXPR_NAT_FLAGS] = { .maxlen =
sizeof(uint32_t) },
277struct expr_ops expr_ops_nat = {
280 .nftnl_max_attr = __NFTNL_EXPR_NAT_MAX - 1,
281 .attr_policy = nat_attr_policy,
282 .set = nftnl_expr_nat_set,
283 .get = nftnl_expr_nat_get,
284 .parse = nftnl_expr_nat_parse,
285 .build = nftnl_expr_nat_build,
286 .output = nftnl_expr_nat_snprintf,