12 #include <linux/netfilter/nf_tables.h>
15 #include <libmnl/libmnl.h>
16 #include <libnftnl/expr.h>
17 #include <libnftnl/rule.h>
21 enum nft_registers sreg_proto_min;
22 enum nft_registers sreg_proto_max;
26 nftnl_expr_masq_set(
struct nftnl_expr *e, uint16_t type,
27 const void *data, uint32_t data_len)
32 case NFTNL_EXPR_MASQ_FLAGS:
33 memcpy(&masq->flags, data, data_len);
35 case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
36 memcpy(&masq->sreg_proto_min, data, data_len);
38 case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
39 memcpy(&masq->sreg_proto_max, data, data_len);
46 nftnl_expr_masq_get(
const struct nftnl_expr *e, uint16_t type,
52 case NFTNL_EXPR_MASQ_FLAGS:
53 *data_len =
sizeof(masq->flags);
55 case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
56 *data_len =
sizeof(masq->sreg_proto_min);
57 return &masq->sreg_proto_min;
58 case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
59 *data_len =
sizeof(masq->sreg_proto_max);
60 return &masq->sreg_proto_max;
65 static int nftnl_expr_masq_cb(
const struct nlattr *attr,
void *data)
67 const struct nlattr **tb = data;
68 int type = mnl_attr_get_type(attr);
70 if (mnl_attr_type_valid(attr, NFTA_MASQ_MAX) < 0)
74 case NFTA_MASQ_REG_PROTO_MIN:
75 case NFTA_MASQ_REG_PROTO_MAX:
77 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
87 nftnl_expr_masq_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
91 if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS))
92 mnl_attr_put_u32(nlh, NFTA_MASQ_FLAGS, htobe32(masq->flags));
93 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN))
94 mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MIN,
95 htobe32(masq->sreg_proto_min));
96 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX))
97 mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MAX,
98 htobe32(masq->sreg_proto_max));
102 nftnl_expr_masq_parse(
struct nftnl_expr *e,
struct nlattr *attr)
105 struct nlattr *tb[NFTA_MASQ_MAX+1] = {};
107 if (mnl_attr_parse_nested(attr, nftnl_expr_masq_cb, tb) < 0)
110 if (tb[NFTA_MASQ_FLAGS]) {
111 masq->flags = be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_FLAGS]));
112 e->flags |= (1 << NFTNL_EXPR_MASQ_FLAGS);
114 if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
115 masq->sreg_proto_min =
116 be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MIN]));
117 e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN);
119 if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
120 masq->sreg_proto_max =
121 be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MAX]));
122 e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX);
128 static int nftnl_expr_masq_snprintf(
char *buf,
size_t remain,
129 uint32_t flags,
const struct nftnl_expr *e)
132 int offset = 0, ret = 0;
134 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN)) {
135 ret = snprintf(buf + offset, remain,
"proto_min reg %u ",
136 masq->sreg_proto_min);
137 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
139 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX)) {
140 ret = snprintf(buf + offset, remain,
"proto_max reg %u ",
141 masq->sreg_proto_max);
142 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
144 if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS)) {
145 ret = snprintf(buf + offset, remain,
"flags 0x%x ", masq->flags);
146 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
152 static struct attr_policy masq_attr_policy[__NFTNL_EXPR_MASQ_MAX] = {
153 [NFTNL_EXPR_MASQ_FLAGS] = { .maxlen =
sizeof(uint32_t) },
154 [NFTNL_EXPR_MASQ_REG_PROTO_MIN] = { .maxlen =
sizeof(uint32_t) },
155 [NFTNL_EXPR_MASQ_REG_PROTO_MAX] = { .maxlen =
sizeof(uint32_t) },
158 struct expr_ops expr_ops_masq = {
161 .nftnl_max_attr = __NFTNL_EXPR_MASQ_MAX - 1,
162 .attr_policy = masq_attr_policy,
163 .set = nftnl_expr_masq_set,
164 .get = nftnl_expr_masq_get,
165 .parse = nftnl_expr_masq_parse,
166 .build = nftnl_expr_masq_build,
167 .output = nftnl_expr_masq_snprintf,