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;
33nftnl_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,
sizeof(byteorder->sreg));
42 case NFTNL_EXPR_BYTEORDER_DREG:
43 memcpy(&byteorder->dreg, data,
sizeof(byteorder->dreg));
45 case NFTNL_EXPR_BYTEORDER_OP:
46 memcpy(&byteorder->op, data,
sizeof(byteorder->op));
48 case NFTNL_EXPR_BYTEORDER_LEN:
49 memcpy(&byteorder->len, data,
sizeof(byteorder->len));
51 case NFTNL_EXPR_BYTEORDER_SIZE:
52 memcpy(&byteorder->size, data,
sizeof(byteorder->size));
61nftnl_expr_byteorder_get(
const struct nftnl_expr *e, uint16_t type,
67 case NFTNL_EXPR_BYTEORDER_SREG:
68 *data_len =
sizeof(byteorder->sreg);
69 return &byteorder->sreg;
70 case NFTNL_EXPR_BYTEORDER_DREG:
71 *data_len =
sizeof(byteorder->dreg);
72 return &byteorder->dreg;
73 case NFTNL_EXPR_BYTEORDER_OP:
74 *data_len =
sizeof(byteorder->op);
75 return &byteorder->op;
76 case NFTNL_EXPR_BYTEORDER_LEN:
77 *data_len =
sizeof(byteorder->len);
78 return &byteorder->len;
79 case NFTNL_EXPR_BYTEORDER_SIZE:
80 *data_len =
sizeof(byteorder->size);
81 return &byteorder->size;
86static int nftnl_expr_byteorder_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_BYTEORDER_MAX) < 0)
95 case NFTA_BYTEORDER_SREG:
96 case NFTA_BYTEORDER_DREG:
97 case NFTA_BYTEORDER_OP:
98 case NFTA_BYTEORDER_LEN:
99 case NFTA_BYTEORDER_SIZE:
100 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
110nftnl_expr_byteorder_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
114 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_SREG)) {
115 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SREG,
116 htonl(byteorder->sreg));
118 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_DREG)) {
119 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_DREG,
120 htonl(byteorder->dreg));
122 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_OP)) {
123 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_OP,
124 htonl(byteorder->op));
126 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_LEN)) {
127 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_LEN,
128 htonl(byteorder->len));
130 if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_SIZE)) {
131 mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SIZE,
132 htonl(byteorder->size));
137nftnl_expr_byteorder_parse(
struct nftnl_expr *e,
struct nlattr *attr)
140 struct nlattr *tb[NFTA_BYTEORDER_MAX+1] = {};
143 if (mnl_attr_parse_nested(attr, nftnl_expr_byteorder_cb, tb) < 0)
146 if (tb[NFTA_BYTEORDER_SREG]) {
148 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SREG]));
149 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_SREG);
151 if (tb[NFTA_BYTEORDER_DREG]) {
153 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_DREG]));
154 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_DREG);
156 if (tb[NFTA_BYTEORDER_OP]) {
158 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_OP]));
159 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_OP);
161 if (tb[NFTA_BYTEORDER_LEN]) {
163 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_LEN]));
164 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_LEN);
166 if (tb[NFTA_BYTEORDER_SIZE]) {
168 ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SIZE]));
169 e->flags |= (1 << NFTNL_EXPR_BYTEORDER_SIZE);
175static const char *expr_byteorder_str[] = {
176 [NFT_BYTEORDER_HTON] =
"hton",
177 [NFT_BYTEORDER_NTOH] =
"ntoh",
180static const char *bo2str(uint32_t type)
182 if (type > NFT_BYTEORDER_HTON)
185 return expr_byteorder_str[type];
188static inline int nftnl_str2ntoh(
const char *op)
190 if (strcmp(op,
"ntoh") == 0)
191 return NFT_BYTEORDER_NTOH;
192 else if (strcmp(op,
"hton") == 0)
193 return NFT_BYTEORDER_HTON;
201nftnl_expr_byteorder_snprintf(
char *buf,
size_t remain,
202 uint32_t flags,
const struct nftnl_expr *e)
207 ret = snprintf(buf, remain,
"reg %u = %s(reg %u, %u, %u) ",
208 byteorder->dreg, bo2str(byteorder->op),
209 byteorder->sreg, byteorder->size, byteorder->len);
210 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
215struct expr_ops expr_ops_byteorder = {
218 .max_attr = NFTA_BYTEORDER_MAX,
219 .set = nftnl_expr_byteorder_set,
220 .get = nftnl_expr_byteorder_get,
221 .parse = nftnl_expr_byteorder_parse,
222 .build = nftnl_expr_byteorder_build,
223 .output = nftnl_expr_byteorder_snprintf,