15#include <libmnl/libmnl.h>
17#include <linux/netfilter/nf_tables.h>
18#include <linux/netfilter/nf_tables_compat.h>
20#include <libnftnl/expr.h>
21#include <libnftnl/rule.h>
24#define XT_EXTENSION_MAXNAMELEN 29
27 char name[XT_EXTENSION_MAXNAMELEN];
34nftnl_expr_match_set(
struct nftnl_expr *e, uint16_t type,
35 const void *data, uint32_t data_len)
40 case NFTNL_EXPR_MT_NAME:
41 snprintf(mt->name,
sizeof(mt->name),
"%.*s", data_len,
44 case NFTNL_EXPR_MT_REV:
45 memcpy(&mt->rev, data, data_len);
47 case NFTNL_EXPR_MT_INFO:
48 if (e->flags & (1 << NFTNL_EXPR_MT_INFO))
52 mt->data_len = data_len;
59nftnl_expr_match_get(
const struct nftnl_expr *e, uint16_t type,
65 case NFTNL_EXPR_MT_NAME:
66 *data_len =
sizeof(mt->name);
68 case NFTNL_EXPR_MT_REV:
69 *data_len =
sizeof(mt->rev);
71 case NFTNL_EXPR_MT_INFO:
72 *data_len = mt->data_len;
78static int nftnl_expr_match_cb(
const struct nlattr *attr,
void *data)
80 const struct nlattr **tb = data;
81 int type = mnl_attr_get_type(attr);
83 if (mnl_attr_type_valid(attr, NFTA_MATCH_MAX) < 0)
88 if (mnl_attr_validate(attr, MNL_TYPE_NUL_STRING) < 0)
92 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
96 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
106nftnl_expr_match_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
110 if (e->flags & (1 << NFTNL_EXPR_MT_NAME))
111 mnl_attr_put_strz(nlh, NFTA_MATCH_NAME, mt->name);
112 if (e->flags & (1 << NFTNL_EXPR_MT_REV))
113 mnl_attr_put_u32(nlh, NFTA_MATCH_REV, htonl(mt->rev));
114 if (e->flags & (1 << NFTNL_EXPR_MT_INFO))
115 mnl_attr_put(nlh, NFTA_MATCH_INFO, mt->data_len, mt->data);
118static int nftnl_expr_match_parse(
struct nftnl_expr *e,
struct nlattr *attr)
121 struct nlattr *tb[NFTA_MATCH_MAX+1] = {};
123 if (mnl_attr_parse_nested(attr, nftnl_expr_match_cb, tb) < 0)
126 if (tb[NFTA_MATCH_NAME]) {
127 snprintf(match->name, XT_EXTENSION_MAXNAMELEN,
"%s",
128 mnl_attr_get_str(tb[NFTA_MATCH_NAME]));
130 match->name[XT_EXTENSION_MAXNAMELEN-1] =
'\0';
131 e->flags |= (1 << NFTNL_EXPR_MT_NAME);
134 if (tb[NFTA_MATCH_REV]) {
135 match->rev = ntohl(mnl_attr_get_u32(tb[NFTA_MATCH_REV]));
136 e->flags |= (1 << NFTNL_EXPR_MT_REV);
139 if (tb[NFTA_MATCH_INFO]) {
140 uint32_t len = mnl_attr_get_payload_len(tb[NFTA_MATCH_INFO]);
143 if (e->flags & (1 << NFTNL_EXPR_MT_INFO))
146 match_data = calloc(1, len);
147 if (match_data == NULL)
150 memcpy(match_data, mnl_attr_get_payload(tb[NFTA_MATCH_INFO]), len);
152 match->data = match_data;
153 match->data_len = len;
155 e->flags |= (1 << NFTNL_EXPR_MT_INFO);
162nftnl_expr_match_snprintf(
char *buf,
size_t len,
163 uint32_t flags,
const struct nftnl_expr *e)
167 return snprintf(buf, len,
"name %s rev %u ", match->name, match->rev);
170static void nftnl_expr_match_free(
const struct nftnl_expr *e)
177static struct attr_policy match_attr_policy[__NFTNL_EXPR_MT_MAX] = {
178 [NFTNL_EXPR_MT_NAME] = { .maxlen = XT_EXTENSION_MAXNAMELEN },
179 [NFTNL_EXPR_MT_REV] = { .maxlen =
sizeof(uint32_t) },
180 [NFTNL_EXPR_MT_INFO] = { .maxlen = 0 },
183struct expr_ops expr_ops_match = {
186 .nftnl_max_attr = __NFTNL_EXPR_MT_MAX - 1,
187 .attr_policy = match_attr_policy,
188 .free = nftnl_expr_match_free,
189 .set = nftnl_expr_match_set,
190 .get = nftnl_expr_match_get,
191 .parse = nftnl_expr_match_parse,
192 .build = nftnl_expr_match_build,
193 .output = nftnl_expr_match_snprintf,