17 #include <arpa/inet.h>
19 #include <libmnl/libmnl.h>
21 #include <linux/netfilter/nf_tables.h>
22 #include <linux/netfilter/nf_tables_compat.h>
24 #include <libnftnl/expr.h>
25 #include <libnftnl/rule.h>
28 #define XT_EXTENSION_MAXNAMELEN 29
31 char name[XT_EXTENSION_MAXNAMELEN];
38 nftnl_expr_match_set(
struct nftnl_expr *e, uint16_t type,
39 const void *data, uint32_t data_len)
44 case NFTNL_EXPR_MT_NAME:
45 snprintf(mt->name,
sizeof(mt->name),
"%.*s", data_len,
48 case NFTNL_EXPR_MT_REV:
49 memcpy(&mt->rev, data, data_len);
51 case NFTNL_EXPR_MT_INFO:
52 if (e->flags & (1 << NFTNL_EXPR_MT_INFO))
56 mt->data_len = data_len;
63 nftnl_expr_match_get(
const struct nftnl_expr *e, uint16_t type,
69 case NFTNL_EXPR_MT_NAME:
70 *data_len =
sizeof(mt->name);
72 case NFTNL_EXPR_MT_REV:
73 *data_len =
sizeof(mt->rev);
75 case NFTNL_EXPR_MT_INFO:
76 *data_len = mt->data_len;
82 static int nftnl_expr_match_cb(
const struct nlattr *attr,
void *data)
84 const struct nlattr **tb = data;
85 int type = mnl_attr_get_type(attr);
87 if (mnl_attr_type_valid(attr, NFTA_MATCH_MAX) < 0)
92 if (mnl_attr_validate(attr, MNL_TYPE_NUL_STRING) < 0)
96 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
100 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
110 nftnl_expr_match_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
114 if (e->flags & (1 << NFTNL_EXPR_MT_NAME))
115 mnl_attr_put_strz(nlh, NFTA_MATCH_NAME, mt->name);
116 if (e->flags & (1 << NFTNL_EXPR_MT_REV))
117 mnl_attr_put_u32(nlh, NFTA_MATCH_REV, htonl(mt->rev));
118 if (e->flags & (1 << NFTNL_EXPR_MT_INFO))
119 mnl_attr_put(nlh, NFTA_MATCH_INFO, mt->data_len, mt->data);
122 static int nftnl_expr_match_parse(
struct nftnl_expr *e,
struct nlattr *attr)
125 struct nlattr *tb[NFTA_MATCH_MAX+1] = {};
127 if (mnl_attr_parse_nested(attr, nftnl_expr_match_cb, tb) < 0)
130 if (tb[NFTA_MATCH_NAME]) {
131 snprintf(match->name, XT_EXTENSION_MAXNAMELEN,
"%s",
132 mnl_attr_get_str(tb[NFTA_MATCH_NAME]));
134 match->name[XT_EXTENSION_MAXNAMELEN-1] =
'\0';
135 e->flags |= (1 << NFTNL_EXPR_MT_NAME);
138 if (tb[NFTA_MATCH_REV]) {
139 match->rev = ntohl(mnl_attr_get_u32(tb[NFTA_MATCH_REV]));
140 e->flags |= (1 << NFTNL_EXPR_MT_REV);
143 if (tb[NFTA_MATCH_INFO]) {
144 uint32_t len = mnl_attr_get_payload_len(tb[NFTA_MATCH_INFO]);
147 if (e->flags & (1 << NFTNL_EXPR_MT_INFO))
150 match_data = calloc(1, len);
151 if (match_data == NULL)
154 memcpy(match_data, mnl_attr_get_payload(tb[NFTA_MATCH_INFO]), len);
156 match->data = match_data;
157 match->data_len = len;
159 e->flags |= (1 << NFTNL_EXPR_MT_INFO);
166 nftnl_expr_match_snprintf(
char *buf,
size_t len,
167 uint32_t flags,
const struct nftnl_expr *e)
171 return snprintf(buf, len,
"name %s rev %u ", match->name, match->rev);
174 static void nftnl_expr_match_free(
const struct nftnl_expr *e)
181 static struct attr_policy match_attr_policy[__NFTNL_EXPR_MT_MAX] = {
182 [NFTNL_EXPR_MT_NAME] = { .maxlen = XT_EXTENSION_MAXNAMELEN },
183 [NFTNL_EXPR_MT_REV] = { .maxlen =
sizeof(uint32_t) },
184 [NFTNL_EXPR_MT_INFO] = { .maxlen = 0 },
187 struct expr_ops expr_ops_match = {
190 .nftnl_max_attr = __NFTNL_EXPR_MT_MAX - 1,
191 .attr_policy = match_attr_policy,
192 .free = nftnl_expr_match_free,
193 .set = nftnl_expr_match_set,
194 .get = nftnl_expr_match_get,
195 .parse = nftnl_expr_match_parse,
196 .build = nftnl_expr_match_build,
197 .output = nftnl_expr_match_snprintf,