15 #include <arpa/inet.h>
17 #include <linux/netfilter/nf_tables.h>
20 #include <libmnl/libmnl.h>
21 #include <libnftnl/expr.h>
22 #include <libnftnl/rule.h>
26 enum nft_registers dreg;
27 enum nft_registers sreg;
31 #define IP_CT_DIR_ORIGINAL 0
32 #define IP_CT_DIR_REPLY 1
35 #define NFT_CT_MAX (NFT_CT_LABELS + 1)
39 nftnl_expr_ct_set(
struct nftnl_expr *e, uint16_t type,
40 const void *data, uint32_t data_len)
45 case NFTNL_EXPR_CT_KEY:
46 ct->key = *((uint32_t *)data);
48 case NFTNL_EXPR_CT_DIR:
49 ct->dir = *((uint8_t *)data);
51 case NFTNL_EXPR_CT_DREG:
52 ct->dreg = *((uint32_t *)data);
54 case NFTNL_EXPR_CT_SREG:
55 ct->sreg = *((uint32_t *)data);
64 nftnl_expr_ct_get(
const struct nftnl_expr *e, uint16_t type,
70 case NFTNL_EXPR_CT_KEY:
71 *data_len =
sizeof(ct->key);
73 case NFTNL_EXPR_CT_DIR:
74 *data_len =
sizeof(ct->dir);
76 case NFTNL_EXPR_CT_DREG:
77 *data_len =
sizeof(ct->dreg);
79 case NFTNL_EXPR_CT_SREG:
80 *data_len =
sizeof(ct->sreg);
86 static int nftnl_expr_ct_cb(
const struct nlattr *attr,
void *data)
88 const struct nlattr **tb = data;
89 int type = mnl_attr_get_type(attr);
91 if (mnl_attr_type_valid(attr, NFTA_CT_MAX) < 0)
98 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
101 case NFTA_CT_DIRECTION:
102 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
112 nftnl_expr_ct_build(
struct nlmsghdr *nlh,
struct nftnl_expr *e)
116 if (e->flags & (1 << NFTNL_EXPR_CT_KEY))
117 mnl_attr_put_u32(nlh, NFTA_CT_KEY, htonl(ct->key));
118 if (e->flags & (1 << NFTNL_EXPR_CT_DREG))
119 mnl_attr_put_u32(nlh, NFTA_CT_DREG, htonl(ct->dreg));
120 if (e->flags & (1 << NFTNL_EXPR_CT_DIR))
121 mnl_attr_put_u8(nlh, NFTA_CT_DIRECTION, ct->dir);
122 if (e->flags & (1 << NFTNL_EXPR_CT_SREG))
123 mnl_attr_put_u32(nlh, NFTA_CT_SREG, htonl(ct->sreg));
127 nftnl_expr_ct_parse(
struct nftnl_expr *e,
struct nlattr *attr)
130 struct nlattr *tb[NFTA_CT_MAX+1] = {};
132 if (mnl_attr_parse_nested(attr, nftnl_expr_ct_cb, tb) < 0)
135 if (tb[NFTA_CT_KEY]) {
136 ct->key = ntohl(mnl_attr_get_u32(tb[NFTA_CT_KEY]));
137 e->flags |= (1 << NFTNL_EXPR_CT_KEY);
139 if (tb[NFTA_CT_DREG]) {
140 ct->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_CT_DREG]));
141 e->flags |= (1 << NFTNL_EXPR_CT_DREG);
143 if (tb[NFTA_CT_SREG]) {
144 ct->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_CT_SREG]));
145 e->flags |= (1 << NFTNL_EXPR_CT_SREG);
147 if (tb[NFTA_CT_DIRECTION]) {
148 ct->dir = mnl_attr_get_u8(tb[NFTA_CT_DIRECTION]);
149 e->flags |= (1 << NFTNL_EXPR_CT_DIR);
155 const char *ctkey2str_array[NFT_CT_MAX] = {
156 [NFT_CT_STATE] =
"state",
157 [NFT_CT_DIRECTION] =
"direction",
158 [NFT_CT_STATUS] =
"status",
159 [NFT_CT_MARK] =
"mark",
160 [NFT_CT_SECMARK] =
"secmark",
161 [NFT_CT_EXPIRATION] =
"expiration",
162 [NFT_CT_HELPER] =
"helper",
163 [NFT_CT_L3PROTOCOL] =
"l3protocol",
164 [NFT_CT_PROTOCOL] =
"protocol",
165 [NFT_CT_SRC] =
"src",
166 [NFT_CT_DST] =
"dst",
167 [NFT_CT_PROTO_SRC] =
"proto_src",
168 [NFT_CT_PROTO_DST] =
"proto_dst",
169 [NFT_CT_LABELS] =
"label",
172 static const char *ctkey2str(uint32_t ctkey)
174 if (ctkey > NFT_CT_MAX)
177 return ctkey2str_array[ctkey];
180 static inline int str2ctkey(
const char *ctkey)
184 for (i = 0; i < NFT_CT_MAX; i++) {
185 if (strcmp(ctkey2str_array[i], ctkey) == 0)
192 static const char *ctdir2str(uint8_t ctdir)
195 case IP_CT_DIR_ORIGINAL:
197 case IP_CT_DIR_REPLY:
204 static inline int str2ctdir(
const char *str, uint8_t *ctdir)
206 if (strcmp(str,
"original") == 0) {
207 *ctdir = IP_CT_DIR_ORIGINAL;
211 if (strcmp(str,
"reply") == 0) {
212 *ctdir = IP_CT_DIR_REPLY;
219 static int nftnl_expr_ct_json_parse(
struct nftnl_expr *e, json_t *root,
220 struct nftnl_parse_err *err)
223 const char *key_str, *dir_str;
228 if (nftnl_jansson_parse_reg(root,
"dreg", NFTNL_TYPE_U32, ®, err) == 0)
229 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_DREG, reg);
231 if (nftnl_jansson_parse_reg(root,
"sreg", NFTNL_TYPE_U32, ®, err) == 0)
232 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_SREG, reg);
234 key_str = nftnl_jansson_parse_str(root,
"key", err);
235 if (key_str != NULL) {
236 key = str2ctkey(key_str);
240 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_KEY, key);
243 dir_str = nftnl_jansson_parse_str(root,
"dir", err);
244 if (dir_str != NULL) {
245 if (str2ctdir(dir_str, &dir) != 0) {
246 err->node_name =
"dir";
247 err->error = NFTNL_PARSE_EBADTYPE;
250 nftnl_expr_set_u8(e, NFTNL_EXPR_CT_DIR, dir);
264 static int nftnl_expr_ct_xml_parse(
struct nftnl_expr *e, mxml_node_t *tree,
265 struct nftnl_parse_err *err)
268 const char *key_str, *dir_str;
273 if (nftnl_mxml_reg_parse(tree,
"dreg", &dreg, MXML_DESCEND_FIRST,
274 NFTNL_XML_OPT, err) == 0)
275 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_DREG, dreg);
277 if (nftnl_mxml_reg_parse(tree,
"sreg", &sreg, MXML_DESCEND_FIRST,
278 NFTNL_XML_OPT, err) == 0)
279 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_SREG, sreg);
281 key_str = nftnl_mxml_str_parse(tree,
"key", MXML_DESCEND_FIRST,
282 NFTNL_XML_MAND, err);
283 if (key_str != NULL) {
284 key = str2ctkey(key_str);
288 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_KEY, key);
290 dir_str = nftnl_mxml_str_parse(tree,
"dir", MXML_DESCEND_FIRST,
292 if (dir_str != NULL) {
293 if (str2ctdir(dir_str, &dir) != 0) {
294 err->node_name =
"dir";
295 err->error = NFTNL_PARSE_EBADTYPE;
298 nftnl_expr_set_u8(e, NFTNL_EXPR_CT_DIR, dir);
312 nftnl_expr_ct_export(
char *buf,
size_t size,
struct nftnl_expr *e,
int type)
315 NFTNL_BUF_INIT(b, buf, size);
317 if (e->flags & (1 << NFTNL_EXPR_CT_SREG))
318 nftnl_buf_u32(&b, type, ct->sreg, SREG);
319 if (e->flags & (1 << NFTNL_EXPR_CT_DREG))
320 nftnl_buf_u32(&b, type, ct->dreg, DREG);
321 if (e->flags & (1 << NFTNL_EXPR_CT_KEY))
322 nftnl_buf_str(&b, type, ctkey2str(ct->key), KEY);
323 if (e->flags & (1 << NFTNL_EXPR_CT_DIR))
324 nftnl_buf_str(&b, type, ctdir2str(ct->dir), DIR);
326 return nftnl_buf_done(&b);
330 nftnl_expr_ct_snprintf_default(
char *buf,
size_t size,
struct nftnl_expr *e)
332 int ret, len = size, offset = 0;
335 if (e->flags & (1 << NFTNL_EXPR_CT_SREG)) {
336 ret = snprintf(buf, size,
"set %s with reg %u ",
337 ctkey2str(ct->key), ct->sreg);
338 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
341 if (e->flags & (1 << NFTNL_EXPR_CT_DREG)) {
342 ret = snprintf(buf, len,
"load %s => reg %u ",
343 ctkey2str(ct->key), ct->dreg);
344 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
347 if (nftnl_expr_is_set(e, NFTNL_EXPR_CT_DIR)) {
348 ret = snprintf(buf+offset, len,
", dir %s ",
350 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
357 nftnl_expr_ct_snprintf(
char *buf,
size_t len, uint32_t type,
358 uint32_t flags,
struct nftnl_expr *e)
361 case NFTNL_OUTPUT_DEFAULT:
362 return nftnl_expr_ct_snprintf_default(buf, len, e);
363 case NFTNL_OUTPUT_XML:
364 case NFTNL_OUTPUT_JSON:
365 return nftnl_expr_ct_export(buf, len, e, type);
372 struct expr_ops expr_ops_ct = {
375 .max_attr = NFTA_CT_MAX,
376 .set = nftnl_expr_ct_set,
377 .get = nftnl_expr_ct_get,
378 .parse = nftnl_expr_ct_parse,
379 .build = nftnl_expr_ct_build,
380 .snprintf = nftnl_expr_ct_snprintf,
381 .xml_parse = nftnl_expr_ct_xml_parse,
382 .json_parse = nftnl_expr_ct_json_parse,