13#include <linux/netfilter/nf_tables.h>
14#include <linux/netfilter/nf_log.h>
17#include <libmnl/libmnl.h>
18#include <libnftnl/expr.h>
19#include <libnftnl/rule.h>
30static int nftnl_expr_log_set(
struct nftnl_expr *e, uint16_t type,
31 const void *data, uint32_t data_len)
36 case NFTNL_EXPR_LOG_PREFIX:
37 if (log->flags & (1 << NFTNL_EXPR_LOG_PREFIX))
40 log->prefix = strdup(data);
44 case NFTNL_EXPR_LOG_GROUP:
45 memcpy(&log->group, data, data_len);
47 case NFTNL_EXPR_LOG_SNAPLEN:
48 memcpy(&log->snaplen, data, data_len);
50 case NFTNL_EXPR_LOG_QTHRESHOLD:
51 memcpy(&log->qthreshold, data, data_len);
53 case NFTNL_EXPR_LOG_LEVEL:
54 memcpy(&log->level, data, data_len);
56 case NFTNL_EXPR_LOG_FLAGS:
57 memcpy(&log->flags, data, data_len);
64nftnl_expr_log_get(
const struct nftnl_expr *e, uint16_t type,
70 case NFTNL_EXPR_LOG_PREFIX:
71 *data_len = strlen(log->prefix)+1;
73 case NFTNL_EXPR_LOG_GROUP:
74 *data_len =
sizeof(log->group);
76 case NFTNL_EXPR_LOG_SNAPLEN:
77 *data_len =
sizeof(log->snaplen);
79 case NFTNL_EXPR_LOG_QTHRESHOLD:
80 *data_len =
sizeof(log->qthreshold);
81 return &log->qthreshold;
82 case NFTNL_EXPR_LOG_LEVEL:
83 *data_len =
sizeof(log->level);
85 case NFTNL_EXPR_LOG_FLAGS:
86 *data_len =
sizeof(log->flags);
92static int nftnl_expr_log_cb(
const struct nlattr *attr,
void *data)
94 const struct nlattr **tb = data;
95 int type = mnl_attr_get_type(attr);
97 if (mnl_attr_type_valid(attr, NFTA_LOG_MAX) < 0)
101 case NFTA_LOG_PREFIX:
102 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
106 case NFTA_LOG_QTHRESHOLD:
107 if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
110 case NFTA_LOG_SNAPLEN:
113 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
123nftnl_expr_log_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
127 if (e->flags & (1 << NFTNL_EXPR_LOG_PREFIX))
128 mnl_attr_put_strz(nlh, NFTA_LOG_PREFIX, log->prefix);
129 if (e->flags & (1 << NFTNL_EXPR_LOG_GROUP))
130 mnl_attr_put_u16(nlh, NFTA_LOG_GROUP, htons(log->group));
131 if (e->flags & (1 << NFTNL_EXPR_LOG_SNAPLEN))
132 mnl_attr_put_u32(nlh, NFTA_LOG_SNAPLEN, htonl(log->snaplen));
133 if (e->flags & (1 << NFTNL_EXPR_LOG_QTHRESHOLD))
134 mnl_attr_put_u16(nlh, NFTA_LOG_QTHRESHOLD, htons(log->qthreshold));
135 if (e->flags & (1 << NFTNL_EXPR_LOG_LEVEL))
136 mnl_attr_put_u32(nlh, NFTA_LOG_LEVEL, htonl(log->level));
137 if (e->flags & (1 << NFTNL_EXPR_LOG_FLAGS))
138 mnl_attr_put_u32(nlh, NFTA_LOG_FLAGS, htonl(log->flags));
142nftnl_expr_log_parse(
struct nftnl_expr *e,
struct nlattr *attr)
145 struct nlattr *tb[NFTA_LOG_MAX+1] = {};
147 if (mnl_attr_parse_nested(attr, nftnl_expr_log_cb, tb) < 0)
150 if (tb[NFTA_LOG_PREFIX]) {
154 log->prefix = strdup(mnl_attr_get_str(tb[NFTA_LOG_PREFIX]));
157 e->flags |= (1 << NFTNL_EXPR_LOG_PREFIX);
159 if (tb[NFTA_LOG_GROUP]) {
160 log->group = ntohs(mnl_attr_get_u16(tb[NFTA_LOG_GROUP]));
161 e->flags |= (1 << NFTNL_EXPR_LOG_GROUP);
163 if (tb[NFTA_LOG_SNAPLEN]) {
164 log->snaplen = ntohl(mnl_attr_get_u32(tb[NFTA_LOG_SNAPLEN]));
165 e->flags |= (1 << NFTNL_EXPR_LOG_SNAPLEN);
167 if (tb[NFTA_LOG_QTHRESHOLD]) {
168 log->qthreshold = ntohs(mnl_attr_get_u16(tb[NFTA_LOG_QTHRESHOLD]));
169 e->flags |= (1 << NFTNL_EXPR_LOG_QTHRESHOLD);
171 if (tb[NFTA_LOG_LEVEL]) {
172 log->level = ntohl(mnl_attr_get_u32(tb[NFTA_LOG_LEVEL]));
173 e->flags |= (1 << NFTNL_EXPR_LOG_LEVEL);
175 if (tb[NFTA_LOG_FLAGS]) {
176 log->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LOG_FLAGS]));
177 e->flags |= (1 << NFTNL_EXPR_LOG_FLAGS);
184nftnl_expr_log_snprintf(
char *buf,
size_t remain,
185 uint32_t flags,
const struct nftnl_expr *e)
190 if (e->flags & (1 << NFTNL_EXPR_LOG_PREFIX)) {
191 ret = snprintf(buf, remain,
"prefix %s ", log->prefix);
192 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
195 if (e->flags & (1 << NFTNL_EXPR_LOG_GROUP)) {
196 ret = snprintf(buf + offset, remain,
197 "group %u snaplen %u qthreshold %u ",
198 log->group, log->snaplen, log->qthreshold);
199 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
201 if (e->flags & (1 << NFTNL_EXPR_LOG_LEVEL)) {
202 ret = snprintf(buf + offset, remain,
"level %u ",
204 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
206 if (e->flags & (1 << NFTNL_EXPR_LOG_FLAGS)) {
207 if (log->flags & NF_LOG_TCPSEQ) {
208 ret = snprintf(buf + offset, remain,
"tcpseq ");
209 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
211 if (log->flags & NF_LOG_TCPOPT) {
212 ret = snprintf(buf + offset, remain,
"tcpopt ");
213 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
215 if (log->flags & NF_LOG_IPOPT) {
216 ret = snprintf(buf + offset, remain,
"ipopt ");
217 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
219 if (log->flags & NF_LOG_UID) {
220 ret = snprintf(buf + offset, remain,
"uid ");
221 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
223 if (log->flags & NF_LOG_MACDECODE) {
224 ret = snprintf(buf + offset, remain,
226 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
234static void nftnl_expr_log_free(
const struct nftnl_expr *e)
241static struct attr_policy log_attr_policy[__NFTNL_EXPR_LOG_MAX] = {
242 [NFTNL_EXPR_LOG_PREFIX] = { .maxlen = NF_LOG_PREFIXLEN },
243 [NFTNL_EXPR_LOG_GROUP] = { .maxlen =
sizeof(uint16_t) },
244 [NFTNL_EXPR_LOG_SNAPLEN] = { .maxlen =
sizeof(uint32_t) },
245 [NFTNL_EXPR_LOG_QTHRESHOLD] = { .maxlen =
sizeof(uint16_t) },
246 [NFTNL_EXPR_LOG_LEVEL] = { .maxlen =
sizeof(uint32_t) },
247 [NFTNL_EXPR_LOG_FLAGS] = { .maxlen =
sizeof(uint32_t) },
250struct expr_ops expr_ops_log = {
253 .nftnl_max_attr = __NFTNL_EXPR_LOG_MAX - 1,
254 .attr_policy = log_attr_policy,
255 .free = nftnl_expr_log_free,
256 .set = nftnl_expr_log_set,
257 .get = nftnl_expr_log_get,
258 .parse = nftnl_expr_log_parse,
259 .build = nftnl_expr_log_build,
260 .output = nftnl_expr_log_snprintf,