20#include <libmnl/libmnl.h>
22#include <linux/netfilter/nf_tables.h>
24#include <libnftnl/expr.h>
25#include <libnftnl/rule.h>
32 enum nft_registers dreg;
33 enum nft_registers sreg;
42nftnl_expr_exthdr_set(
struct nftnl_expr *e, uint16_t type,
43 const void *data, uint32_t data_len)
48 case NFTNL_EXPR_EXTHDR_DREG:
49 memcpy(&exthdr->dreg, data, data_len);
51 case NFTNL_EXPR_EXTHDR_TYPE:
52 memcpy(&exthdr->type, data, data_len);
54 case NFTNL_EXPR_EXTHDR_OFFSET:
55 memcpy(&exthdr->offset, data, data_len);
57 case NFTNL_EXPR_EXTHDR_LEN:
58 memcpy(&exthdr->len, data, data_len);
60 case NFTNL_EXPR_EXTHDR_OP:
61 memcpy(&exthdr->op, data, data_len);
63 case NFTNL_EXPR_EXTHDR_FLAGS:
64 memcpy(&exthdr->flags, data, data_len);
66 case NFTNL_EXPR_EXTHDR_SREG:
67 memcpy(&exthdr->sreg, data, data_len);
74nftnl_expr_exthdr_get(
const struct nftnl_expr *e, uint16_t type,
80 case NFTNL_EXPR_EXTHDR_DREG:
81 *data_len =
sizeof(exthdr->dreg);
83 case NFTNL_EXPR_EXTHDR_TYPE:
84 *data_len =
sizeof(exthdr->type);
86 case NFTNL_EXPR_EXTHDR_OFFSET:
87 *data_len =
sizeof(exthdr->offset);
88 return &exthdr->offset;
89 case NFTNL_EXPR_EXTHDR_LEN:
90 *data_len =
sizeof(exthdr->len);
92 case NFTNL_EXPR_EXTHDR_OP:
93 *data_len =
sizeof(exthdr->op);
95 case NFTNL_EXPR_EXTHDR_FLAGS:
96 *data_len =
sizeof(exthdr->flags);
97 return &exthdr->flags;
98 case NFTNL_EXPR_EXTHDR_SREG:
99 *data_len =
sizeof(exthdr->sreg);
100 return &exthdr->sreg;
105static int nftnl_expr_exthdr_cb(
const struct nlattr *attr,
void *data)
107 const struct nlattr **tb = data;
108 int type = mnl_attr_get_type(attr);
110 if (mnl_attr_type_valid(attr, NFTA_EXTHDR_MAX) < 0)
114 case NFTA_EXTHDR_TYPE:
115 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
118 case NFTA_EXTHDR_DREG:
119 case NFTA_EXTHDR_SREG:
120 case NFTA_EXTHDR_OFFSET:
121 case NFTA_EXTHDR_LEN:
123 case NFTA_EXTHDR_FLAGS:
124 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
134nftnl_expr_exthdr_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
138 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_DREG))
139 mnl_attr_put_u32(nlh, NFTA_EXTHDR_DREG, htonl(exthdr->dreg));
140 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_SREG))
141 mnl_attr_put_u32(nlh, NFTA_EXTHDR_SREG, htonl(exthdr->sreg));
142 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_TYPE))
143 mnl_attr_put_u8(nlh, NFTA_EXTHDR_TYPE, exthdr->type);
144 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_OFFSET))
145 mnl_attr_put_u32(nlh, NFTA_EXTHDR_OFFSET, htonl(exthdr->offset));
146 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_LEN))
147 mnl_attr_put_u32(nlh, NFTA_EXTHDR_LEN, htonl(exthdr->len));
148 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_OP))
149 mnl_attr_put_u32(nlh, NFTA_EXTHDR_OP, htonl(exthdr->op));
150 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_FLAGS))
151 mnl_attr_put_u32(nlh, NFTA_EXTHDR_FLAGS, htonl(exthdr->flags));
155nftnl_expr_exthdr_parse(
struct nftnl_expr *e,
struct nlattr *attr)
158 struct nlattr *tb[NFTA_EXTHDR_MAX+1] = {};
160 if (mnl_attr_parse_nested(attr, nftnl_expr_exthdr_cb, tb) < 0)
163 if (tb[NFTA_EXTHDR_DREG]) {
164 exthdr->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_DREG]));
165 e->flags |= (1 << NFTNL_EXPR_EXTHDR_DREG);
167 if (tb[NFTA_EXTHDR_SREG]) {
168 exthdr->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_SREG]));
169 e->flags |= (1 << NFTNL_EXPR_EXTHDR_SREG);
171 if (tb[NFTA_EXTHDR_TYPE]) {
172 exthdr->type = mnl_attr_get_u8(tb[NFTA_EXTHDR_TYPE]);
173 e->flags |= (1 << NFTNL_EXPR_EXTHDR_TYPE);
175 if (tb[NFTA_EXTHDR_OFFSET]) {
176 exthdr->offset = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_OFFSET]));
177 e->flags |= (1 << NFTNL_EXPR_EXTHDR_OFFSET);
179 if (tb[NFTA_EXTHDR_LEN]) {
180 exthdr->len = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_LEN]));
181 e->flags |= (1 << NFTNL_EXPR_EXTHDR_LEN);
183 if (tb[NFTA_EXTHDR_OP]) {
184 exthdr->op = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_OP]));
185 e->flags |= (1 << NFTNL_EXPR_EXTHDR_OP);
187 if (tb[NFTA_EXTHDR_FLAGS]) {
188 exthdr->flags = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_FLAGS]));
189 e->flags |= (1 << NFTNL_EXPR_EXTHDR_FLAGS);
195static const char *op2str(uint8_t op)
198 case NFT_EXTHDR_OP_TCPOPT:
200 case NFT_EXTHDR_OP_IPV6:
202 case NFT_EXTHDR_OP_IPV4:
209static inline int str2exthdr_op(
const char* str)
211 if (!strcmp(str,
"tcpopt"))
212 return NFT_EXTHDR_OP_TCPOPT;
213 if (!strcmp(str,
"ipv4"))
214 return NFT_EXTHDR_OP_IPV4;
217 return NFT_EXTHDR_OP_IPV6;
220static inline int str2exthdr_type(
const char *str)
222 if (strcmp(str,
"hopopts") == 0)
223 return IPPROTO_HOPOPTS;
224 else if (strcmp(str,
"routing") == 0)
225 return IPPROTO_ROUTING;
226 else if (strcmp(str,
"fragment") == 0)
227 return IPPROTO_FRAGMENT;
228 else if (strcmp(str,
"dstopts") == 0)
229 return IPPROTO_DSTOPTS;
230 else if (strcmp(str,
"mh") == 0)
237nftnl_expr_exthdr_snprintf(
char *buf,
size_t len,
238 uint32_t flags,
const struct nftnl_expr *e)
242 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_DREG))
243 return snprintf(buf, len,
"load%s %ub @ %u + %u%s => reg %u ",
244 op2str(exthdr->op), exthdr->len, exthdr->type,
246 exthdr->flags & NFT_EXTHDR_F_PRESENT ?
" present" :
"",
248 else if (e->flags & (1 << NFTNL_EXPR_EXTHDR_SREG))
249 return snprintf(buf, len,
"write%s reg %u => %ub @ %u + %u ",
250 op2str(exthdr->op), exthdr->sreg, exthdr->len, exthdr->type,
252 else if (exthdr->op == NFT_EXTHDR_OP_TCPOPT && exthdr->len == 0)
253 return snprintf(buf, len,
"reset tcpopt %u ", exthdr->type);
255 return snprintf(buf, len,
"op %u len %u type %u offset %u ",
256 exthdr->op, exthdr->len, exthdr->type, exthdr->offset);
260static struct attr_policy exthdr_attr_policy[__NFTNL_EXPR_EXTHDR_MAX] = {
261 [NFTNL_EXPR_EXTHDR_DREG] = { .maxlen =
sizeof(uint32_t) },
262 [NFTNL_EXPR_EXTHDR_TYPE] = { .maxlen =
sizeof(uint8_t) },
263 [NFTNL_EXPR_EXTHDR_OFFSET] = { .maxlen =
sizeof(uint32_t) },
264 [NFTNL_EXPR_EXTHDR_LEN] = { .maxlen =
sizeof(uint32_t) },
265 [NFTNL_EXPR_EXTHDR_FLAGS] = { .maxlen =
sizeof(uint32_t) },
266 [NFTNL_EXPR_EXTHDR_OP] = { .maxlen =
sizeof(uint32_t) },
267 [NFTNL_EXPR_EXTHDR_SREG] = { .maxlen =
sizeof(uint32_t) },
270struct expr_ops expr_ops_exthdr = {
273 .nftnl_max_attr = __NFTNL_EXPR_EXTHDR_MAX - 1,
274 .attr_policy = exthdr_attr_policy,
275 .set = nftnl_expr_exthdr_set,
276 .get = nftnl_expr_exthdr_get,
277 .parse = nftnl_expr_exthdr_parse,
278 .build = nftnl_expr_exthdr_build,
279 .output = nftnl_expr_exthdr_snprintf,