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,
sizeof(exthdr->dreg));
51 case NFTNL_EXPR_EXTHDR_TYPE:
52 memcpy(&exthdr->type, data,
sizeof(exthdr->type));
54 case NFTNL_EXPR_EXTHDR_OFFSET:
55 memcpy(&exthdr->offset, data,
sizeof(exthdr->offset));
57 case NFTNL_EXPR_EXTHDR_LEN:
58 memcpy(&exthdr->len, data,
sizeof(exthdr->len));
60 case NFTNL_EXPR_EXTHDR_OP:
61 memcpy(&exthdr->op, data,
sizeof(exthdr->op));
63 case NFTNL_EXPR_EXTHDR_FLAGS:
64 memcpy(&exthdr->flags, data,
sizeof(exthdr->flags));
66 case NFTNL_EXPR_EXTHDR_SREG:
67 memcpy(&exthdr->sreg, data,
sizeof(exthdr->sreg));
76nftnl_expr_exthdr_get(
const struct nftnl_expr *e, uint16_t type,
82 case NFTNL_EXPR_EXTHDR_DREG:
83 *data_len =
sizeof(exthdr->dreg);
85 case NFTNL_EXPR_EXTHDR_TYPE:
86 *data_len =
sizeof(exthdr->type);
88 case NFTNL_EXPR_EXTHDR_OFFSET:
89 *data_len =
sizeof(exthdr->offset);
90 return &exthdr->offset;
91 case NFTNL_EXPR_EXTHDR_LEN:
92 *data_len =
sizeof(exthdr->len);
94 case NFTNL_EXPR_EXTHDR_OP:
95 *data_len =
sizeof(exthdr->op);
97 case NFTNL_EXPR_EXTHDR_FLAGS:
98 *data_len =
sizeof(exthdr->flags);
99 return &exthdr->flags;
100 case NFTNL_EXPR_EXTHDR_SREG:
101 *data_len =
sizeof(exthdr->sreg);
102 return &exthdr->sreg;
107static int nftnl_expr_exthdr_cb(
const struct nlattr *attr,
void *data)
109 const struct nlattr **tb = data;
110 int type = mnl_attr_get_type(attr);
112 if (mnl_attr_type_valid(attr, NFTA_EXTHDR_MAX) < 0)
116 case NFTA_EXTHDR_TYPE:
117 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
120 case NFTA_EXTHDR_DREG:
121 case NFTA_EXTHDR_SREG:
122 case NFTA_EXTHDR_OFFSET:
123 case NFTA_EXTHDR_LEN:
125 case NFTA_EXTHDR_FLAGS:
126 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
136nftnl_expr_exthdr_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
140 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_DREG))
141 mnl_attr_put_u32(nlh, NFTA_EXTHDR_DREG, htonl(exthdr->dreg));
142 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_SREG))
143 mnl_attr_put_u32(nlh, NFTA_EXTHDR_SREG, htonl(exthdr->sreg));
144 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_TYPE))
145 mnl_attr_put_u8(nlh, NFTA_EXTHDR_TYPE, exthdr->type);
146 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_OFFSET))
147 mnl_attr_put_u32(nlh, NFTA_EXTHDR_OFFSET, htonl(exthdr->offset));
148 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_LEN))
149 mnl_attr_put_u32(nlh, NFTA_EXTHDR_LEN, htonl(exthdr->len));
150 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_OP))
151 mnl_attr_put_u32(nlh, NFTA_EXTHDR_OP, htonl(exthdr->op));
152 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_FLAGS))
153 mnl_attr_put_u32(nlh, NFTA_EXTHDR_FLAGS, htonl(exthdr->flags));
157nftnl_expr_exthdr_parse(
struct nftnl_expr *e,
struct nlattr *attr)
160 struct nlattr *tb[NFTA_EXTHDR_MAX+1] = {};
162 if (mnl_attr_parse_nested(attr, nftnl_expr_exthdr_cb, tb) < 0)
165 if (tb[NFTA_EXTHDR_DREG]) {
166 exthdr->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_DREG]));
167 e->flags |= (1 << NFTNL_EXPR_EXTHDR_DREG);
169 if (tb[NFTA_EXTHDR_SREG]) {
170 exthdr->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_SREG]));
171 e->flags |= (1 << NFTNL_EXPR_EXTHDR_SREG);
173 if (tb[NFTA_EXTHDR_TYPE]) {
174 exthdr->type = mnl_attr_get_u8(tb[NFTA_EXTHDR_TYPE]);
175 e->flags |= (1 << NFTNL_EXPR_EXTHDR_TYPE);
177 if (tb[NFTA_EXTHDR_OFFSET]) {
178 exthdr->offset = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_OFFSET]));
179 e->flags |= (1 << NFTNL_EXPR_EXTHDR_OFFSET);
181 if (tb[NFTA_EXTHDR_LEN]) {
182 exthdr->len = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_LEN]));
183 e->flags |= (1 << NFTNL_EXPR_EXTHDR_LEN);
185 if (tb[NFTA_EXTHDR_OP]) {
186 exthdr->op = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_OP]));
187 e->flags |= (1 << NFTNL_EXPR_EXTHDR_OP);
189 if (tb[NFTA_EXTHDR_FLAGS]) {
190 exthdr->flags = ntohl(mnl_attr_get_u32(tb[NFTA_EXTHDR_FLAGS]));
191 e->flags |= (1 << NFTNL_EXPR_EXTHDR_FLAGS);
197static const char *op2str(uint8_t op)
200 case NFT_EXTHDR_OP_TCPOPT:
202 case NFT_EXTHDR_OP_IPV6:
204 case NFT_EXTHDR_OP_IPV4:
211static inline int str2exthdr_op(
const char* str)
213 if (!strcmp(str,
"tcpopt"))
214 return NFT_EXTHDR_OP_TCPOPT;
215 if (!strcmp(str,
"ipv4"))
216 return NFT_EXTHDR_OP_IPV4;
219 return NFT_EXTHDR_OP_IPV6;
222static inline int str2exthdr_type(
const char *str)
224 if (strcmp(str,
"hopopts") == 0)
225 return IPPROTO_HOPOPTS;
226 else if (strcmp(str,
"routing") == 0)
227 return IPPROTO_ROUTING;
228 else if (strcmp(str,
"fragment") == 0)
229 return IPPROTO_FRAGMENT;
230 else if (strcmp(str,
"dstopts") == 0)
231 return IPPROTO_DSTOPTS;
232 else if (strcmp(str,
"mh") == 0)
239nftnl_expr_exthdr_snprintf(
char *buf,
size_t len,
240 uint32_t flags,
const struct nftnl_expr *e)
244 if (e->flags & (1 << NFTNL_EXPR_EXTHDR_DREG))
245 return snprintf(buf, len,
"load%s %ub @ %u + %u%s => reg %u ",
246 op2str(exthdr->op), exthdr->len, exthdr->type,
248 exthdr->flags & NFT_EXTHDR_F_PRESENT ?
" present" :
"",
250 else if (e->flags & (1 << NFTNL_EXPR_EXTHDR_SREG))
251 return snprintf(buf, len,
"write%s reg %u => %ub @ %u + %u ",
252 op2str(exthdr->op), exthdr->sreg, exthdr->len, exthdr->type,
254 else if (exthdr->op == NFT_EXTHDR_OP_TCPOPT && exthdr->len == 0)
255 return snprintf(buf, len,
"reset tcpopt %u ", exthdr->type);
257 return snprintf(buf, len,
"op %u len %u type %u offset %u ",
258 exthdr->op, exthdr->len, exthdr->type, exthdr->offset);
262struct expr_ops expr_ops_exthdr = {
265 .max_attr = NFTA_EXTHDR_MAX,
266 .set = nftnl_expr_exthdr_set,
267 .get = nftnl_expr_exthdr_get,
268 .parse = nftnl_expr_exthdr_parse,
269 .build = nftnl_expr_exthdr_build,
270 .output = nftnl_expr_exthdr_snprintf,