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libnetlink: Add helper to create nexthop dump request

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Add rtnl_nexthopdump_req to initiate a dump request of nexthop objects.

Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
David Ahern 2019-06-07 15:38:11 -07:00
parent 10631938f1
commit 74829ca7dd
2 changed files with 31 additions and 0 deletions
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4
include/libnetlink.h
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@ -93,6 +93,10 @@ int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n) int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
__attribute__((warn_unused_result)); __attribute__((warn_unused_result));
int rtnl_nexthopdump_req(struct rtnl_handle *rth, int family,
req_filter_fn_t filter_fn)
__attribute__((warn_unused_result));
struct rtnl_ctrl_data { struct rtnl_ctrl_data {
int nsid; int nsid;
}; };

27
lib/libnetlink.c
View File

@ -25,6 +25,7 @@
#include <linux/fib_rules.h> #include <linux/fib_rules.h>
#include <linux/if_addrlabel.h> #include <linux/if_addrlabel.h>
#include <linux/if_bridge.h> #include <linux/if_bridge.h>
#include <linux/nexthop.h>
#include "libnetlink.h" #include "libnetlink.h"
@ -252,6 +253,32 @@ int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE); return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
} }
int rtnl_nexthopdump_req(struct rtnl_handle *rth, int family,
req_filter_fn_t filter_fn)
{
struct {
struct nlmsghdr nlh;
struct nhmsg nhm;
char buf[128];
} req = {
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct nhmsg)),
.nlh.nlmsg_type = RTM_GETNEXTHOP,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
.nhm.nh_family = family,
};
if (filter_fn) {
int err;
err = filter_fn(&req.nlh, sizeof(req));
if (err)
return err;
}
return send(rth->fd, &req, sizeof(req), 0);
}
int rtnl_addrdump_req(struct rtnl_handle *rth, int family, int rtnl_addrdump_req(struct rtnl_handle *rth, int family,
req_filter_fn_t filter_fn) req_filter_fn_t filter_fn)
{ {