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,
sizeof(masq->flags));
39 case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
40 memcpy(&masq->sreg_proto_min, data,
sizeof(masq->sreg_proto_min));
42 case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
43 memcpy(&masq->sreg_proto_max, data,
sizeof(masq->sreg_proto_max));
52 nftnl_expr_masq_get(
const struct nftnl_expr *e, uint16_t type,
58 case NFTNL_EXPR_MASQ_FLAGS:
59 *data_len =
sizeof(masq->flags);
61 case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
62 *data_len =
sizeof(masq->sreg_proto_min);
63 return &masq->sreg_proto_min;
64 case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
65 *data_len =
sizeof(masq->sreg_proto_max);
66 return &masq->sreg_proto_max;
71 static int nftnl_expr_masq_cb(
const struct nlattr *attr,
void *data)
73 const struct nlattr **tb = data;
74 int type = mnl_attr_get_type(attr);
76 if (mnl_attr_type_valid(attr, NFTA_MASQ_MAX) < 0)
80 case NFTA_MASQ_REG_PROTO_MIN:
81 case NFTA_MASQ_REG_PROTO_MAX:
83 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
93 nftnl_expr_masq_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
97 if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS))
98 mnl_attr_put_u32(nlh, NFTA_MASQ_FLAGS, htobe32(masq->flags));
99 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN))
100 mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MIN,
101 htobe32(masq->sreg_proto_min));
102 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX))
103 mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MAX,
104 htobe32(masq->sreg_proto_max));
108 nftnl_expr_masq_parse(
struct nftnl_expr *e,
struct nlattr *attr)
111 struct nlattr *tb[NFTA_MASQ_MAX+1] = {};
113 if (mnl_attr_parse_nested(attr, nftnl_expr_masq_cb, tb) < 0)
116 if (tb[NFTA_MASQ_FLAGS]) {
117 masq->flags = be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_FLAGS]));
118 e->flags |= (1 << NFTNL_EXPR_MASQ_FLAGS);
120 if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
121 masq->sreg_proto_min =
122 be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MIN]));
123 e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN);
125 if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
126 masq->sreg_proto_max =
127 be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MAX]));
128 e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX);
134 static int nftnl_expr_masq_snprintf_default(
char *buf,
size_t len,
135 const struct nftnl_expr *e)
138 int remain = len, offset = 0, ret = 0;
140 if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN)) {
141 ret = snprintf(buf, remain,
142 "proto_min reg %u proto_max reg %u ",
143 masq->sreg_proto_min, masq->sreg_proto_max);
144 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
146 if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS)) {
147 ret = snprintf(buf + offset, remain,
"flags 0x%x ", masq->flags);
148 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
154 static int nftnl_expr_masq_snprintf(
char *buf,
size_t len, uint32_t type,
155 uint32_t flags,
const struct nftnl_expr *e)
158 case NFTNL_OUTPUT_DEFAULT:
159 return nftnl_expr_masq_snprintf_default(buf, len, e);
160 case NFTNL_OUTPUT_XML:
161 case NFTNL_OUTPUT_JSON:
168 struct expr_ops expr_ops_masq = {
171 .max_attr = NFTA_MASQ_MAX,
172 .set = nftnl_expr_masq_set,
173 .get = nftnl_expr_masq_get,
174 .parse = nftnl_expr_masq_parse,
175 .build = nftnl_expr_masq_build,
176 .snprintf = nftnl_expr_masq_snprintf,