13 #include <arpa/inet.h>
14 #include <libmnl/libmnl.h>
15 #include <linux/netfilter/nf_tables.h>
16 #include <libnftnl/expr.h>
17 #include <libnftnl/rule.h>
20 enum nft_registers sreg_addr;
21 enum nft_registers sreg_port;
26 nftnl_expr_tproxy_set(
struct nftnl_expr *e, uint16_t type,
27 const void *data, uint32_t data_len)
32 case NFTNL_EXPR_TPROXY_FAMILY:
33 memcpy(&tproxy->family, data, data_len);
35 case NFTNL_EXPR_TPROXY_REG_ADDR:
36 memcpy(&tproxy->sreg_addr, data, data_len);
38 case NFTNL_EXPR_TPROXY_REG_PORT:
39 memcpy(&tproxy->sreg_port, data, data_len);
47 nftnl_expr_tproxy_get(
const struct nftnl_expr *e, uint16_t type,
53 case NFTNL_EXPR_TPROXY_FAMILY:
54 *data_len =
sizeof(tproxy->family);
55 return &tproxy->family;
56 case NFTNL_EXPR_TPROXY_REG_ADDR:
57 *data_len =
sizeof(tproxy->sreg_addr);
58 return &tproxy->sreg_addr;
59 case NFTNL_EXPR_TPROXY_REG_PORT:
60 *data_len =
sizeof(tproxy->sreg_port);
61 return &tproxy->sreg_port;
66 static int nftnl_expr_tproxy_cb(
const struct nlattr *attr,
void *data)
68 const struct nlattr **tb = data;
69 int type = mnl_attr_get_type(attr);
71 if (mnl_attr_type_valid(attr, NFTA_TPROXY_MAX) < 0)
75 case NFTA_TPROXY_FAMILY:
76 case NFTA_TPROXY_REG_ADDR:
77 case NFTA_TPROXY_REG_PORT:
78 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
88 nftnl_expr_tproxy_parse(
struct nftnl_expr *e,
struct nlattr *attr)
91 struct nlattr *tb[NFTA_TPROXY_MAX + 1] = {};
93 if (mnl_attr_parse_nested(attr, nftnl_expr_tproxy_cb, tb) < 0)
96 if (tb[NFTA_TPROXY_FAMILY]) {
97 tproxy->family = ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_FAMILY]));
98 e->flags |= (1 << NFTNL_EXPR_TPROXY_FAMILY);
100 if (tb[NFTA_TPROXY_REG_ADDR]) {
102 ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_ADDR]));
103 e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_ADDR);
105 if (tb[NFTA_TPROXY_REG_PORT]) {
107 ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_PORT]));
108 e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_PORT);
115 nftnl_expr_tproxy_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
119 if (e->flags & (1 << NFTNL_EXPR_TPROXY_FAMILY))
120 mnl_attr_put_u32(nlh, NFTA_TPROXY_FAMILY, htonl(tproxy->family));
122 if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR))
123 mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_ADDR,
124 htonl(tproxy->sreg_addr));
126 if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT))
127 mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_PORT,
128 htonl(tproxy->sreg_port));
132 nftnl_expr_tproxy_snprintf(
char *buf,
size_t remain,
133 uint32_t flags,
const struct nftnl_expr *e)
136 int offset = 0, ret = 0;
138 if (tproxy->family != NFTA_TPROXY_UNSPEC) {
139 ret = snprintf(buf + offset, remain,
"%s ",
140 nftnl_family2str(tproxy->family));
141 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
144 if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR)) {
145 ret = snprintf(buf + offset, remain,
146 "addr reg %u ", tproxy->sreg_addr);
147 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
150 if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT)) {
151 ret = snprintf(buf + offset, remain,
152 "port reg %u ", tproxy->sreg_port);
153 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
159 static struct attr_policy tproxy_attr_policy[__NFTNL_EXPR_TPROXY_MAX] = {
160 [NFTNL_EXPR_TPROXY_FAMILY] = { .maxlen =
sizeof(uint32_t) },
161 [NFTNL_EXPR_TPROXY_REG_ADDR] = { .maxlen =
sizeof(uint32_t) },
162 [NFTNL_EXPR_TPROXY_REG_PORT] = { .maxlen =
sizeof(uint32_t) },
165 struct expr_ops expr_ops_tproxy = {
168 .nftnl_max_attr = __NFTNL_EXPR_TPROXY_MAX - 1,
169 .attr_policy = tproxy_attr_policy,
170 .set = nftnl_expr_tproxy_set,
171 .get = nftnl_expr_tproxy_get,
172 .parse = nftnl_expr_tproxy_parse,
173 .build = nftnl_expr_tproxy_build,
174 .output = nftnl_expr_tproxy_snprintf,