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_EVENTMASK + 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,
const 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 static 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",
170 [NFT_CT_PKTS] =
"packets",
171 [NFT_CT_BYTES] =
"bytes",
172 [NFT_CT_AVGPKT] =
"avgpkt",
173 [NFT_CT_ZONE] =
"zone",
174 [NFT_CT_EVENTMASK] =
"event",
177 static const char *ctkey2str(uint32_t ctkey)
179 if (ctkey >= NFT_CT_MAX)
182 return ctkey2str_array[ctkey];
185 static inline int str2ctkey(
const char *ctkey)
189 for (i = 0; i < NFT_CT_MAX; i++) {
190 if (strcmp(ctkey2str_array[i], ctkey) == 0)
197 static const char *ctdir2str(uint8_t ctdir)
200 case IP_CT_DIR_ORIGINAL:
202 case IP_CT_DIR_REPLY:
209 static inline int str2ctdir(
const char *str, uint8_t *ctdir)
211 if (strcmp(str,
"original") == 0) {
212 *ctdir = IP_CT_DIR_ORIGINAL;
216 if (strcmp(str,
"reply") == 0) {
217 *ctdir = IP_CT_DIR_REPLY;
224 static int nftnl_expr_ct_json_parse(
struct nftnl_expr *e, json_t *root,
225 struct nftnl_parse_err *err)
228 const char *key_str, *dir_str;
233 if (nftnl_jansson_parse_reg(root,
"dreg", NFTNL_TYPE_U32, ®, err) == 0)
234 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_DREG, reg);
236 if (nftnl_jansson_parse_reg(root,
"sreg", NFTNL_TYPE_U32, ®, err) == 0)
237 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_SREG, reg);
239 key_str = nftnl_jansson_parse_str(root,
"key", err);
240 if (key_str != NULL) {
241 key = str2ctkey(key_str);
245 nftnl_expr_set_u32(e, NFTNL_EXPR_CT_KEY, key);
248 dir_str = nftnl_jansson_parse_str(root,
"dir", err);
249 if (dir_str != NULL) {
250 if (str2ctdir(dir_str, &dir) != 0) {
251 err->node_name =
"dir";
252 err->error = NFTNL_PARSE_EBADTYPE;
255 nftnl_expr_set_u8(e, NFTNL_EXPR_CT_DIR, dir);
270 nftnl_expr_ct_export(
char *buf,
size_t size,
const struct nftnl_expr *e,
274 NFTNL_BUF_INIT(b, buf, size);
276 if (e->flags & (1 << NFTNL_EXPR_CT_SREG))
277 nftnl_buf_u32(&b, type, ct->sreg, SREG);
278 if (e->flags & (1 << NFTNL_EXPR_CT_DREG))
279 nftnl_buf_u32(&b, type, ct->dreg, DREG);
280 if (e->flags & (1 << NFTNL_EXPR_CT_KEY))
281 nftnl_buf_str(&b, type, ctkey2str(ct->key), KEY);
282 if (e->flags & (1 << NFTNL_EXPR_CT_DIR))
283 nftnl_buf_str(&b, type, ctdir2str(ct->dir), DIR);
285 return nftnl_buf_done(&b);
289 nftnl_expr_ct_snprintf_default(
char *buf,
size_t size,
290 const struct nftnl_expr *e)
292 int ret, remain = size, offset = 0;
295 if (e->flags & (1 << NFTNL_EXPR_CT_SREG)) {
296 ret = snprintf(buf, size,
"set %s with reg %u ",
297 ctkey2str(ct->key), ct->sreg);
298 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
301 if (e->flags & (1 << NFTNL_EXPR_CT_DREG)) {
302 ret = snprintf(buf, remain,
"load %s => reg %u ",
303 ctkey2str(ct->key), ct->dreg);
304 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
307 if (nftnl_expr_is_set(e, NFTNL_EXPR_CT_DIR)) {
308 ret = snprintf(buf + offset, remain,
", dir %s ",
310 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
317 nftnl_expr_ct_snprintf(
char *buf,
size_t len, uint32_t type,
318 uint32_t flags,
const struct nftnl_expr *e)
321 case NFTNL_OUTPUT_DEFAULT:
322 return nftnl_expr_ct_snprintf_default(buf, len, e);
323 case NFTNL_OUTPUT_XML:
324 case NFTNL_OUTPUT_JSON:
325 return nftnl_expr_ct_export(buf, len, e, type);
332 static bool nftnl_expr_ct_cmp(
const struct nftnl_expr *e1,
333 const struct nftnl_expr *e2)
339 if (e1->flags & (1 << NFTNL_EXPR_CT_KEY))
340 eq &= (c1->key == c2->key);
341 if (e1->flags & (1 << NFTNL_EXPR_CT_DREG))
342 eq &= (c1->dreg == c2->dreg);
343 if (e1->flags & (1 << NFTNL_EXPR_CT_SREG))
344 eq &= (c1->sreg == c2->sreg);
345 if (e1->flags & (1 << NFTNL_EXPR_CT_DIR))
346 eq &= (c1->dir == c2->dir);
351 struct expr_ops expr_ops_ct = {
354 .max_attr = NFTA_CT_MAX,
355 .cmp = nftnl_expr_ct_cmp,
356 .set = nftnl_expr_ct_set,
357 .get = nftnl_expr_ct_get,
358 .parse = nftnl_expr_ct_parse,
359 .build = nftnl_expr_ct_build,
360 .snprintf = nftnl_expr_ct_snprintf,
361 .json_parse = nftnl_expr_ct_json_parse,