12 #include <arpa/inet.h>
16 #include <linux/netfilter/nf_tables.h>
19 #include <libmnl/libmnl.h>
20 #include <libnftnl/expr.h>
21 #include <libnftnl/rule.h>
25 enum nft_registers sreg_proto_min;
26 enum nft_registers sreg_proto_max;
30 nftnl_expr_masq_set(
struct nftnl_expr *e, uint16_t type,
31 const void *data, uint32_t data_len)
36 case NFTNL_EXPR_MASQ_FLAGS:
37 memcpy(&masq->flags, data, data_len);
39 case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
40 memcpy(&masq->sreg_proto_min, data, data_len);
42 case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
43 memcpy(&masq->sreg_proto_max, data, data_len);
50 nftnl_expr_masq_get(
const struct nftnl_expr *e, uint16_t type,
56 case NFTNL_EXPR_MASQ_FLAGS:
57 *data_len =
sizeof(masq->flags);
59 case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
60 *data_len =
sizeof(masq->sreg_proto_min);
61 return &masq->sreg_proto_min;
62 case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
63 *data_len =
sizeof(masq->sreg_proto_max);
64 return &masq->sreg_proto_max;
69 static int nftnl_expr_masq_cb(
const struct nlattr *attr,
void *data)
71 const struct nlattr **tb = data;
72 int type = mnl_attr_get_type(attr);
74 if (mnl_attr_type_valid(attr, NFTA_MASQ_MAX) < 0)
78 case NFTA_MASQ_REG_PROTO_MIN:
79 case NFTA_MASQ_REG_PROTO_MAX:
81 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
91 nftnl_expr_masq_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
95 if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS))
96 mnl_attr_put_u32(nlh, NFTA_MASQ_FLAGS, htobe32(masq->flags));
97 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN))
98 mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MIN,
99 htobe32(masq->sreg_proto_min));
100 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX))
101 mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MAX,
102 htobe32(masq->sreg_proto_max));
106 nftnl_expr_masq_parse(
struct nftnl_expr *e,
struct nlattr *attr)
109 struct nlattr *tb[NFTA_MASQ_MAX+1] = {};
111 if (mnl_attr_parse_nested(attr, nftnl_expr_masq_cb, tb) < 0)
114 if (tb[NFTA_MASQ_FLAGS]) {
115 masq->flags = be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_FLAGS]));
116 e->flags |= (1 << NFTNL_EXPR_MASQ_FLAGS);
118 if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
119 masq->sreg_proto_min =
120 be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MIN]));
121 e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN);
123 if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
124 masq->sreg_proto_max =
125 be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MAX]));
126 e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX);
132 static int nftnl_expr_masq_snprintf(
char *buf,
size_t remain,
133 uint32_t flags,
const struct nftnl_expr *e)
136 int offset = 0, ret = 0;
138 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN)) {
139 ret = snprintf(buf + offset, remain,
"proto_min reg %u ",
140 masq->sreg_proto_min);
141 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
143 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX)) {
144 ret = snprintf(buf + offset, remain,
"proto_max reg %u ",
145 masq->sreg_proto_max);
146 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
148 if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS)) {
149 ret = snprintf(buf + offset, remain,
"flags 0x%x ", masq->flags);
150 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
156 static struct attr_policy masq_attr_policy[__NFTNL_EXPR_MASQ_MAX] = {
157 [NFTNL_EXPR_MASQ_FLAGS] = { .maxlen =
sizeof(uint32_t) },
158 [NFTNL_EXPR_MASQ_REG_PROTO_MIN] = { .maxlen =
sizeof(uint32_t) },
159 [NFTNL_EXPR_MASQ_REG_PROTO_MAX] = { .maxlen =
sizeof(uint32_t) },
162 struct expr_ops expr_ops_masq = {
165 .nftnl_max_attr = __NFTNL_EXPR_MASQ_MAX - 1,
166 .attr_policy = masq_attr_policy,
167 .set = nftnl_expr_masq_set,
168 .get = nftnl_expr_masq_get,
169 .parse = nftnl_expr_masq_parse,
170 .build = nftnl_expr_masq_build,
171 .output = nftnl_expr_masq_snprintf,