17 #include <arpa/inet.h>
19 #include <libmnl/libmnl.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <libnftnl/expr.h>
22 #include <libnftnl/rule.h>
25 enum nft_registers sreg;
26 enum nft_registers dreg;
27 enum nft_byteorder_ops op;
33 nftnl_expr_byteorder_set(
struct nftnl_expr *e, uint16_t type,
34 const void *data, uint32_t data_len)
39 case NFTNL_EXPR_BYTEORDER_SREG:
40 memcpy(&byteorder->sreg, data, data_len);
42 case NFTNL_EXPR_BYTEORDER_DREG:
43 memcpy(&byteorder->dreg, data, data_len);
45 case NFTNL_EXPR_BYTEORDER_OP:
46 memcpy(&byteorder->op, data, data_len);
48 case NFTNL_EXPR_BYTEORDER_LEN:
49 memcpy(&byteorder->len, data, data_len);
51 case NFTNL_EXPR_BYTEORDER_SIZE:
52 memcpy(&byteorder->size, data, data_len);
59 nftnl_expr_byteorder_get(
const struct nftnl_expr *e, uint16_t type,
65 case NFTNL_EXPR_BYTEORDER_SREG:
66 *data_len =
sizeof(byteorder->sreg);
67 return &byteorder->sreg;
68 case NFTNL_EXPR_BYTEORDER_DREG:
69 *data_len =
sizeof(byteorder->dreg);
70 return &byteorder->dreg;
71 case NFTNL_EXPR_BYTEORDER_OP:
72 *data_len =
sizeof(byteorder->op);
73 return &byteorder->op;
74 case NFTNL_EXPR_BYTEORDER_LEN:
75 *data_len =
sizeof(byteorder->len);
76 return &byteorder->len;
77 case NFTNL_EXPR_BYTEORDER_SIZE:
78 *data_len =
sizeof(byteorder->size);
79 return &byteorder->size;
84 static int nftnl_expr_byteorder_cb(
const struct nlattr *attr,
void *data)
86 const struct nlattr **tb = data;
87 int type = mnl_attr_get_type(attr);
89 if (mnl_attr_type_valid(attr, NFTA_BYTEORDER_MAX) < 0)
93 case NFTA_BYTEORDER_SREG:
94 case NFTA_BYTEORDER_DREG:
95 case NFTA_BYTEORDER_OP:
96 case NFTA_BYTEORDER_LEN:
97 case NFTA_BYTEORDER_SIZE:
98 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
108 nftnl_expr_byteorder_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
112 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_SREG)) {
113 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SREG,
114 htonl(byteorder->sreg));
116 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_DREG)) {
117 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_DREG,
118 htonl(byteorder->dreg));
120 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_OP)) {
121 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_OP,
122 htonl(byteorder->op));
124 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_LEN)) {
125 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_LEN,
126 htonl(byteorder->len));
128 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_SIZE)) {
129 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SIZE,
130 htonl(byteorder->size));
135 nftnl_expr_byteorder_parse(
struct nftnl_expr *e,
struct nlattr *attr)
138 struct nlattr *tb[NFTA_BYTEORDER_MAX+1] = {};
141 if (mnl_attr_parse_nested(attr, nftnl_expr_byteorder_cb, tb) < 0)
144 if (tb[NFTA_BYTEORDER_SREG]) {
146 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SREG]));
147 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_SREG);
149 if (tb[NFTA_BYTEORDER_DREG]) {
151 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_DREG]));
152 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_DREG);
154 if (tb[NFTA_BYTEORDER_OP]) {
156 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_OP]));
157 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_OP);
159 if (tb[NFTA_BYTEORDER_LEN]) {
161 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_LEN]));
162 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_LEN);
164 if (tb[NFTA_BYTEORDER_SIZE]) {
166 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SIZE]));
167 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_SIZE);
173 static const char *expr_byteorder_str[] = {
174 [NFT_BYTEORDER_HTON] =
"hton",
175 [NFT_BYTEORDER_NTOH] =
"ntoh",
178 static const char *bo2str(uint32_t type)
180 if (type > NFT_BYTEORDER_HTON)
183 return expr_byteorder_str[type];
186 static inline int nftnl_str2ntoh(
const char *op)
188 if (strcmp(op,
"ntoh") == 0)
189 return NFT_BYTEORDER_NTOH;
190 else if (strcmp(op,
"hton") == 0)
191 return NFT_BYTEORDER_HTON;
199 nftnl_expr_byteorder_snprintf(
char *buf,
size_t remain,
200 uint32_t flags,
const struct nftnl_expr *e)
205 ret = snprintf(buf, remain,
"reg %u = %s(reg %u, %u, %u) ",
206 byteorder->dreg, bo2str(byteorder->op),
207 byteorder->sreg, byteorder->size, byteorder->len);
208 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
213 static struct attr_policy byteorder_attr_policy[__NFTNL_EXPR_BYTEORDER_MAX] = {
214 [NFTNL_EXPR_BYTEORDER_DREG] = { .maxlen =
sizeof(uint32_t) },
215 [NFTNL_EXPR_BYTEORDER_SREG] = { .maxlen =
sizeof(uint32_t) },
216 [NFTNL_EXPR_BYTEORDER_OP] = { .maxlen =
sizeof(uint32_t) },
217 [NFTNL_EXPR_BYTEORDER_LEN] = { .maxlen =
sizeof(uint32_t) },
218 [NFTNL_EXPR_BYTEORDER_SIZE] = { .maxlen =
sizeof(uint32_t) },
221 struct expr_ops expr_ops_byteorder = {
224 .nftnl_max_attr = __NFTNL_EXPR_BYTEORDER_MAX - 1,
225 .attr_policy = byteorder_attr_policy,
226 .set = nftnl_expr_byteorder_set,
227 .get = nftnl_expr_byteorder_get,
228 .parse = nftnl_expr_byteorder_parse,
229 .build = nftnl_expr_byteorder_build,
230 .output = nftnl_expr_byteorder_snprintf,