19 #include <netlink-local.h> 20 #include <netlink/netlink.h> 21 #include <netlink/utils.h> 22 #include <netlink/route/rtnl.h> 23 #include <netlink/route/rule.h> 27 #define RULE_ATTR_FAMILY 0x0001 28 #define RULE_ATTR_PRIO 0x0002 29 #define RULE_ATTR_MARK 0x0004 30 #define RULE_ATTR_IIF 0x0008 31 #define RULE_ATTR_REALMS 0x0010 32 #define RULE_ATTR_SRC 0x0020 33 #define RULE_ATTR_DST 0x0040 34 #define RULE_ATTR_DSFIELD 0x0080 35 #define RULE_ATTR_TABLE 0x0100 36 #define RULE_ATTR_TYPE 0x0200 37 #define RULE_ATTR_SRC_LEN 0x0400 38 #define RULE_ATTR_DST_LEN 0x0800 39 #define RULE_ATTR_SRCMAP 0x1000 45 static void rule_free_data(
struct nl_object *c)
47 struct rtnl_rule *rule = nl_object_priv(c);
52 nl_addr_put(rule->r_src);
53 nl_addr_put(rule->r_dst);
56 static int rule_clone(
struct nl_object *_dst,
struct nl_object *_src)
58 struct rtnl_rule *dst = nl_object_priv(_dst);
59 struct rtnl_rule *src = nl_object_priv(_src);
71 return nl_get_errno();
74 static struct nla_policy rule_policy[RTA_MAX+1] = {
76 [RTA_FLOW] = { .type =
NLA_U32 },
77 [RTA_PROTOINFO] = { .type =
NLA_U32 },
79 .maxlen = IFNAMSIZ, },
85 struct rtnl_rule *rule;
87 struct nlattr *tb[RTA_MAX+1];
90 rule = rtnl_rule_alloc();
92 err = nl_errno(ENOMEM);
99 err =
nlmsg_parse(n,
sizeof(*r), tb, RTA_MAX, rule_policy);
103 rule->r_family = r->rtm_family;
104 rule->r_type = r->rtm_type;
105 rule->r_dsfield = r->rtm_tos;
106 rule->r_src_len = r->rtm_src_len;
107 rule->r_dst_len = r->rtm_dst_len;
108 rule->r_table = r->rtm_table;
109 rule->ce_mask = (RULE_ATTR_FAMILY | RULE_ATTR_TYPE | RULE_ATTR_DSFIELD |
110 RULE_ATTR_SRC_LEN | RULE_ATTR_DST_LEN |RULE_ATTR_TYPE);
112 if (tb[RTA_PRIORITY]) {
114 rule->ce_mask |= RULE_ATTR_PRIO;
120 err = nl_errno(ENOMEM);
123 nl_addr_set_prefixlen(rule->r_src, r->rtm_src_len);
124 rule->ce_mask |= RULE_ATTR_SRC;
130 err = nl_errno(ENOMEM);
133 nl_addr_set_prefixlen(rule->r_dst, r->rtm_dst_len);
134 rule->ce_mask |= RULE_ATTR_DST;
137 if (tb[RTA_PROTOINFO]) {
139 rule->ce_mask |= RULE_ATTR_MARK;
144 rule->ce_mask |= RULE_ATTR_IIF;
149 rule->ce_mask |= RULE_ATTR_REALMS;
152 if (tb[RTA_GATEWAY]) {
153 rule->r_srcmap =
nla_get_addr(tb[RTA_GATEWAY], r->rtm_family);
154 if (!rule->r_srcmap) {
155 err = nl_errno(ENOMEM);
158 rule->ce_mask |= RULE_ATTR_SRCMAP;
161 err = pp->pp_cb((
struct nl_object *) rule, pp);
172 static int rule_request_update(
struct nl_cache *c,
struct nl_handle *h)
177 static int rule_dump_brief(
struct nl_object *o,
struct nl_dump_params *p)
179 struct rtnl_rule *r = (
struct rtnl_rule *) o;
182 if (r->ce_mask & RULE_ATTR_PRIO)
183 dp_dump(p,
"%d:\t", r->r_prio);
187 if (r->ce_mask & RULE_ATTR_SRC)
188 dp_dump(p,
"from %s ",
190 else if (r->ce_mask & RULE_ATTR_SRC_LEN && r->r_src_len)
191 dp_dump(p,
"from 0/%d ", r->r_src_len);
193 if (r->ce_mask & RULE_ATTR_DST)
196 else if (r->ce_mask & RULE_ATTR_DST_LEN && r->r_dst_len)
197 dp_dump(p,
"to 0/%d ", r->r_dst_len);
199 if (r->ce_mask & RULE_ATTR_DSFIELD && r->r_dsfield)
200 dp_dump(p,
"tos %d ", r->r_dsfield);
202 if (r->ce_mask & RULE_ATTR_MARK)
203 dp_dump(p,
"mark %" PRIx64 , r->r_mark);
205 if (r->ce_mask & RULE_ATTR_IIF)
206 dp_dump(p,
"iif %s ", r->r_iif);
208 if (r->ce_mask & RULE_ATTR_TABLE)
209 dp_dump(p,
"lookup %s ",
210 rtnl_route_table2str(r->r_table, buf,
sizeof(buf)));
212 if (r->ce_mask & RULE_ATTR_REALMS)
213 dp_dump(p,
"realms %s ",
214 rtnl_realms2str(r->r_realms, buf,
sizeof(buf)));
216 dp_dump(p,
"action %s\n",
217 nl_rtntype2str(r->r_type, buf,
sizeof(buf)));
222 static int rule_dump_full(
struct nl_object *obj,
struct nl_dump_params *p)
224 struct rtnl_rule *rule = (
struct rtnl_rule *) obj;
228 line = rule_dump_brief(obj, p);
230 dp_dump_line(p, line++,
" family %s",
231 nl_af2str(rule->r_family, buf,
sizeof(buf)));
233 if (rule->ce_mask & RULE_ATTR_SRCMAP)
234 dp_dump(p,
" srcmap %s",
242 static int rule_dump_stats(
struct nl_object *obj,
struct nl_dump_params *p)
244 return rule_dump_full(obj, p);
247 static int rule_dump_xml(
struct nl_object *obj,
struct nl_dump_params *p)
249 struct rtnl_rule *rule = (
struct rtnl_rule *) obj;
253 dp_dump_line(p, line++,
"<rule>\n");
255 dp_dump_line(p, line++,
" <priority>%u</priority>\n",
257 dp_dump_line(p, line++,
" <family>%s</family>\n",
258 nl_af2str(rule->r_family, buf,
sizeof(buf)));
260 if (rule->ce_mask & RULE_ATTR_DST)
261 dp_dump_line(p, line++,
" <dst>%s</dst>\n",
264 if (rule->ce_mask & RULE_ATTR_DST_LEN)
265 dp_dump_line(p, line++,
" <dstlen>%u</dstlen>\n",
268 if (rule->ce_mask & RULE_ATTR_SRC)
269 dp_dump_line(p, line++,
" <src>%s</src>\n",
272 if (rule->ce_mask & RULE_ATTR_SRC_LEN)
273 dp_dump_line(p, line++,
" <srclen>%u</srclen>\n",
276 if (rule->ce_mask & RULE_ATTR_IIF)
277 dp_dump_line(p, line++,
" <iif>%s</iif>\n", rule->r_iif);
279 if (rule->ce_mask & RULE_ATTR_TABLE)
280 dp_dump_line(p, line++,
" <table>%u</table>\n",
283 if (rule->ce_mask & RULE_ATTR_REALMS)
284 dp_dump_line(p, line++,
" <realms>%u</realms>\n",
287 if (rule->ce_mask & RULE_ATTR_MARK)
288 dp_dump_line(p, line++,
" <mark>%" PRIx64
"</mark>\n",
291 if (rule->ce_mask & RULE_ATTR_DSFIELD)
292 dp_dump_line(p, line++,
" <dsfield>%u</dsfield>\n",
295 if (rule->ce_mask & RULE_ATTR_TYPE)
296 dp_dump_line(p, line++,
"<type>%s</type>\n",
297 nl_rtntype2str(rule->r_type, buf,
sizeof(buf)));
299 if (rule->ce_mask & RULE_ATTR_SRCMAP)
300 dp_dump_line(p, line++,
"<srcmap>%s</srcmap>\n",
303 dp_dump_line(p, line++,
"</rule>\n");
308 static int rule_dump_env(
struct nl_object *obj,
struct nl_dump_params *p)
310 struct rtnl_rule *rule = (
struct rtnl_rule *) obj;
314 dp_dump_line(p, line++,
"RULE_PRIORITY=%u\n",
316 dp_dump_line(p, line++,
"RULE_FAMILY=%s\n",
317 nl_af2str(rule->r_family, buf,
sizeof(buf)));
319 if (rule->ce_mask & RULE_ATTR_DST)
320 dp_dump_line(p, line++,
"RULE_DST=%s\n",
323 if (rule->ce_mask & RULE_ATTR_DST_LEN)
324 dp_dump_line(p, line++,
"RULE_DSTLEN=%u\n",
327 if (rule->ce_mask & RULE_ATTR_SRC)
328 dp_dump_line(p, line++,
"RULE_SRC=%s\n",
331 if (rule->ce_mask & RULE_ATTR_SRC_LEN)
332 dp_dump_line(p, line++,
"RULE_SRCLEN=%u\n",
335 if (rule->ce_mask & RULE_ATTR_IIF)
336 dp_dump_line(p, line++,
"RULE_IIF=%s\n", rule->r_iif);
338 if (rule->ce_mask & RULE_ATTR_TABLE)
339 dp_dump_line(p, line++,
"RULE_TABLE=%u\n",
342 if (rule->ce_mask & RULE_ATTR_REALMS)
343 dp_dump_line(p, line++,
"RULE_REALM=%u\n",
346 if (rule->ce_mask & RULE_ATTR_MARK)
347 dp_dump_line(p, line++,
"RULE_MARK=0x%" PRIx64
"\n",
350 if (rule->ce_mask & RULE_ATTR_DSFIELD)
351 dp_dump_line(p, line++,
"RULE_DSFIELD=%u\n",
354 if (rule->ce_mask & RULE_ATTR_TYPE)
355 dp_dump_line(p, line++,
"RULE_TYPE=%s\n",
356 nl_rtntype2str(rule->r_type, buf,
sizeof(buf)));
358 if (rule->ce_mask & RULE_ATTR_SRCMAP)
359 dp_dump_line(p, line++,
"RULE_SRCMAP=%s\n",
365 static int rule_compare(
struct nl_object *_a,
struct nl_object *_b,
366 uint32_t attrs,
int flags)
368 struct rtnl_rule *a = (
struct rtnl_rule *) _a;
369 struct rtnl_rule *b = (
struct rtnl_rule *) _b;
372 #define RULE_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, RULE_ATTR_##ATTR, a, b, EXPR) 374 diff |= RULE_DIFF(FAMILY, a->r_family != b->r_family);
375 diff |= RULE_DIFF(TABLE, a->r_table != b->r_table);
376 diff |= RULE_DIFF(REALMS, a->r_realms != b->r_realms);
377 diff |= RULE_DIFF(DSFIELD, a->r_dsfield != b->r_dsfield);
378 diff |= RULE_DIFF(TYPE, a->r_type != b->r_type);
379 diff |= RULE_DIFF(PRIO, a->r_prio != b->r_prio);
380 diff |= RULE_DIFF(MARK, a->r_mark != b->r_mark);
381 diff |= RULE_DIFF(SRC_LEN, a->r_src_len != b->r_src_len);
382 diff |= RULE_DIFF(DST_LEN, a->r_dst_len != b->r_dst_len);
383 diff |= RULE_DIFF(SRC,
nl_addr_cmp(a->r_src, b->r_src));
384 diff |= RULE_DIFF(DST,
nl_addr_cmp(a->r_dst, b->r_dst));
385 diff |= RULE_DIFF(IIF, strcmp(a->r_iif, b->r_iif));
392 static struct trans_tbl rule_attrs[] = {
393 __ADD(RULE_ATTR_FAMILY, family)
394 __ADD(RULE_ATTR_PRIO, prio)
395 __ADD(RULE_ATTR_MARK, mark)
396 __ADD(RULE_ATTR_IIF, iif)
397 __ADD(RULE_ATTR_REALMS, realms)
398 __ADD(RULE_ATTR_SRC, src)
399 __ADD(RULE_ATTR_DST, dst)
400 __ADD(RULE_ATTR_DSFIELD, dsfield)
401 __ADD(RULE_ATTR_TABLE, table)
402 __ADD(RULE_ATTR_TYPE, type)
403 __ADD(RULE_ATTR_SRC_LEN, src_len)
404 __ADD(RULE_ATTR_DST_LEN, dst_len)
405 __ADD(RULE_ATTR_SRCMAP, srcmap)
408 static char *rule_attrs2str(
int attrs,
char *buf,
size_t len)
410 return __flags2str(attrs, buf, len, rule_attrs,
411 ARRAY_SIZE(rule_attrs));
419 struct rtnl_rule *rtnl_rule_alloc(
void)
424 void rtnl_rule_put(
struct rtnl_rule *rule)
452 struct nl_cache * cache;
491 static struct nl_msg *build_rule_msg(
struct rtnl_rule *tmpl,
int cmd,
int flags)
495 .rtm_type = RTN_UNSPEC
498 if (cmd == RTM_NEWRULE)
499 rtm.rtm_type = RTN_UNICAST;
501 if (tmpl->ce_mask & RULE_ATTR_FAMILY)
502 rtm.rtm_family = tmpl->r_family;
504 if (tmpl->ce_mask & RULE_ATTR_TABLE)
505 rtm.rtm_table = tmpl->r_table;
507 if (tmpl->ce_mask & RULE_ATTR_DSFIELD)
508 rtm.rtm_tos = tmpl->r_dsfield;
510 if (tmpl->ce_mask & RULE_ATTR_TYPE)
511 rtm.rtm_type = tmpl->r_type;
513 if (tmpl->ce_mask & RULE_ATTR_SRC_LEN)
514 rtm.rtm_src_len = tmpl->r_src_len;
516 if (tmpl->ce_mask & RULE_ATTR_DST_LEN)
517 rtm.rtm_dst_len = tmpl->r_dst_len;
521 goto nla_put_failure;
523 if (
nlmsg_append(msg, &rtm,
sizeof(rtm), NLMSG_ALIGNTO) < 0)
524 goto nla_put_failure;
526 if (tmpl->ce_mask & RULE_ATTR_SRC)
529 if (tmpl->ce_mask & RULE_ATTR_DST)
532 if (tmpl->ce_mask & RULE_ATTR_PRIO)
535 if (tmpl->ce_mask & RULE_ATTR_MARK)
538 if (tmpl->ce_mask & RULE_ATTR_REALMS)
541 if (tmpl->ce_mask & RULE_ATTR_IIF)
566 return build_rule_msg(tmpl, RTM_NEWRULE,
NLM_F_CREATE | flags);
581 int rtnl_rule_add(
struct nl_handle *handle,
struct rtnl_rule *tmpl,
int flags)
588 return nl_errno(ENOMEM);
620 return build_rule_msg(rule, RTM_DELRULE, flags);
643 return nl_errno(ENOMEM);
660 void rtnl_rule_set_family(
struct rtnl_rule *rule,
int family)
662 rule->r_family = family;
663 rule->ce_mask |= RULE_ATTR_FAMILY;
666 int rtnl_rule_get_family(
struct rtnl_rule *rule)
668 if (rule->ce_mask & RULE_ATTR_FAMILY)
669 return rule->r_family;
674 void rtnl_rule_set_prio(
struct rtnl_rule *rule,
int prio)
677 rule->ce_mask |= RULE_ATTR_PRIO;
680 int rtnl_rule_get_prio(
struct rtnl_rule *rule)
682 if (rule->ce_mask & RULE_ATTR_PRIO)
688 void rtnl_rule_set_mark(
struct rtnl_rule *rule, uint64_t mark)
691 rule->ce_mask |= RULE_ATTR_MARK;
694 uint64_t rtnl_rule_get_mark(
struct rtnl_rule *rule)
696 if (rule->ce_mask & RULE_ATTR_MARK)
699 return UINT_LEAST64_MAX;
702 void rtnl_rule_set_table(
struct rtnl_rule *rule,
int table)
704 rule->r_table = table;
705 rule->ce_mask |= RULE_ATTR_TABLE;
708 int rtnl_rule_get_table(
struct rtnl_rule *rule)
710 if (rule->ce_mask & RULE_ATTR_TABLE)
711 return rule->r_table;
716 void rtnl_rule_set_dsfield(
struct rtnl_rule *rule,
int dsfield)
718 rule->r_dsfield = dsfield;
719 rule->ce_mask |= RULE_ATTR_DSFIELD;
722 int rtnl_rule_get_dsfield(
struct rtnl_rule *rule)
724 if (rule->ce_mask & RULE_ATTR_DSFIELD)
725 return rule->r_dsfield;
730 void rtnl_rule_set_src_len(
struct rtnl_rule *rule,
int len)
732 rule->r_src_len = len;
733 if (rule->ce_mask & RULE_ATTR_SRC)
734 nl_addr_set_prefixlen(rule->r_src, len);
735 rule->ce_mask |= RULE_ATTR_SRC_LEN;
738 int rtnl_rule_get_src_len(
struct rtnl_rule *rule)
740 if (rule->ce_mask & RULE_ATTR_SRC_LEN)
741 return rule->r_src_len;
746 void rtnl_rule_set_dst_len(
struct rtnl_rule *rule,
int len)
748 rule->r_dst_len = len;
749 if (rule->ce_mask & RULE_ATTR_DST)
750 nl_addr_set_prefixlen(rule->r_dst, len);
751 rule->ce_mask |= RULE_ATTR_DST_LEN;
754 int rtnl_rule_get_dst_len(
struct rtnl_rule *rule)
756 if (rule->ce_mask & RULE_ATTR_DST_LEN)
757 return rule->r_dst_len;
762 static inline int __assign_addr(
struct rtnl_rule *rule,
struct nl_addr **pos,
763 struct nl_addr *
new, uint8_t *len,
int flag)
765 if (rule->ce_mask & RULE_ATTR_FAMILY) {
766 if (new->a_family != rule->r_family)
767 return nl_error(EINVAL,
"Address family mismatch");
769 rule->r_family =
new->a_family;
778 rule->ce_mask |= (flag | RULE_ATTR_FAMILY);
783 int rtnl_rule_set_src(
struct rtnl_rule *rule,
struct nl_addr *src)
785 return __assign_addr(rule, &rule->r_src, src, &rule->r_src_len,
786 RULE_ATTR_SRC | RULE_ATTR_SRC_LEN);
789 struct nl_addr *rtnl_rule_get_src(
struct rtnl_rule *rule)
791 if (rule->ce_mask & RULE_ATTR_SRC)
797 int rtnl_rule_set_dst(
struct rtnl_rule *rule,
struct nl_addr *dst)
799 return __assign_addr(rule, &rule->r_dst, dst, &rule->r_dst_len,
800 RULE_ATTR_DST | RULE_ATTR_DST_LEN);
803 struct nl_addr *rtnl_rule_get_dst(
struct rtnl_rule *rule)
805 if (rule->ce_mask & RULE_ATTR_DST)
811 int rtnl_rule_set_iif(
struct rtnl_rule *rule,
const char *dev)
813 if (strlen(dev) > IFNAMSIZ-1)
814 return nl_errno(ERANGE);
816 strcpy(rule->r_iif, dev);
817 rule->ce_mask |= RULE_ATTR_IIF;
821 char *rtnl_rule_get_iif(
struct rtnl_rule *rule)
823 if (rule->ce_mask & RULE_ATTR_IIF)
829 void rtnl_rule_set_action(
struct rtnl_rule *rule,
int type)
832 rule->ce_mask |= RULE_ATTR_TYPE;
835 int rtnl_rule_get_action(
struct rtnl_rule *rule)
837 if (rule->ce_mask & RULE_ATTR_TYPE)
840 return nl_errno(ENOENT);
843 void rtnl_rule_set_realms(
struct rtnl_rule *rule, realm_t realms)
845 rule->r_realms = realms;
846 rule->ce_mask |= RULE_ATTR_REALMS;
849 realm_t rtnl_rule_get_realms(
struct rtnl_rule *rule)
851 if (rule->ce_mask & RULE_ATTR_REALMS)
852 return rule->r_realms;
861 .oo_size =
sizeof(
struct rtnl_rule),
862 .oo_free_data = rule_free_data,
863 .oo_clone = rule_clone,
869 .oo_compare = rule_compare,
870 .oo_attrs2str = rule_attrs2str,
875 .co_name =
"route/rule",
876 .co_hdrsize =
sizeof(
struct rtmsg),
878 { RTM_NEWRULE, NL_ACT_NEW,
"new" },
879 { RTM_DELRULE, NL_ACT_DEL,
"del" },
880 { RTM_GETRULE, NL_ACT_GET,
"get" },
881 END_OF_MSGTYPES_LIST,
883 .co_protocol = NETLINK_ROUTE,
884 .co_request_update = rule_request_update,
885 .co_msg_parser = rule_msg_parser,
886 .co_obj_ops = &rule_obj_ops,
889 static void __init rule_init(
void)
894 static void __exit rule_exit(
void)
Dump object in a brief one-liner.
char * nl_addr2str(struct nl_addr *addr, char *buf, size_t size)
Convert abstract address object to character string.
void * nlmsg_data(const struct nlmsghdr *nlh)
head of message payload
uint16_t nlmsg_type
Message type (content type)
struct nl_object * nl_object_alloc(struct nl_object_ops *ops)
Allocate a new object of kind specified by the operations handle.
int nl_cache_mngt_unregister(struct nl_cache_ops *ops)
Unregister a set of cache operations.
attribute validation policy
struct nl_msg * rtnl_rule_build_add_request(struct rtnl_rule *tmpl, int flags)
Build netlink request message to add a new rule.
struct nl_addr * nl_addr_clone(struct nl_addr *addr)
Clone existing abstract address object.
int nl_wait_for_ack(struct nl_handle *handle)
Wait for ACK.
void nlmsg_free(struct nl_msg *n)
Free a netlink message.
int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, struct nlattr *tb[], int maxtype, struct nla_policy *policy)
parse attributes of a netlink message
int rtnl_rule_delete(struct nl_handle *handle, struct rtnl_rule *rule, int flags)
Delete a rule.
#define NLA_PUT_STRING(n, attrtype, value)
Add a character string netlink attribute to a netlink message.
struct nl_cache * rtnl_rule_alloc_cache_by_family(struct nl_handle *handle, int family)
Build a rule cache including all rules of the specified family currently configured in the kernel...
int nl_send_auto_complete(struct nl_handle *handle, struct nl_msg *msg)
Send netlink message and check & extend header values as needed.
int nl_cache_mngt_register(struct nl_cache_ops *ops)
Register a set of cache operations.
int nl_cache_refill(struct nl_handle *handle, struct nl_cache *cache)
(Re)fill a cache with the contents in the kernel.
Dump all attribtes in XML format.
#define NLM_F_CREATE
Create config object if it doesn't already exist.
#define NLM_F_DUMP
Dump all entries.
int nl_rtgen_request(struct nl_handle *handle, int type, int family, int flags)
Send routing netlink request message.
struct nl_addr * nla_get_addr(struct nlattr *nla, int family)
Return payload of address attribute.
#define NLA_PUT_ADDR(n, attrtype, addr)
Add a address attribute to a netlink message.
unsigned int nl_addr_get_prefixlen(struct nl_addr *addr)
Get prefix length of abstract address object.
int nl_addr_cmp(struct nl_addr *a, struct nl_addr *b)
Compares two abstract address objects.
int nlmsg_append(struct nl_msg *n, void *data, size_t len, int pad)
Append data to tail of a netlink message.
void nl_object_put(struct nl_object *obj)
Release a reference from an object.
uint16_t type
Type of attribute or NLA_UNSPEC.
struct nl_msg * nlmsg_alloc_simple(int nlmsgtype, int flags)
Allocate a new netlink message.
uint32_t nla_get_u32(struct nlattr *nla)
Return payload of u32 attribute.
int rtnl_rule_add(struct nl_handle *handle, struct rtnl_rule *tmpl, int flags)
Add a new rule.
struct nl_msg * rtnl_rule_build_delete_request(struct rtnl_rule *rule, int flags)
Build a netlink request message to delete a rule.
char * oo_name
Unique name of object type.
Dump all attributes but no statistics.
Dump all attributes including statistics.
struct nl_cache * rtnl_rule_alloc_cache(struct nl_handle *handle)
Build a rule cache including all rules currently configured in the kernel.
size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
Copy string attribute payload into a sized buffer.
#define NLA_PUT_U32(n, attrtype, value)
Add a u32 netlink attribute to a netlink message.
struct nl_cache * nl_cache_alloc(struct nl_cache_ops *ops)
Allocate an empty cache.
Dump all attribtues as env variables.