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libnetlink: Add variant of rtnl_talk that does not display RTNETLINK answers error

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iplink_vrf has 2 functions used to validate a user given device name is
a VRF device and to return the table id. If the user string is not a
device name ip commands with a vrf keyword show a confusing error
message: "RTNETLINK answers: No such device".

Add a variant of rtnl_talk that does not display the "RTNETLINK answers"
message and update iplink_vrf to use it.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
This commit is contained in:
David Ahern 2016-12-11 16:53:14 -08:00 committed by Stephen Hemminger
parent 2330490f0e
commit 463d9efaa2
3 changed files with 31 additions and 6 deletions
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3
include/libnetlink.h
View File

@ -81,6 +81,9 @@ int rtnl_dump_filter_nc(struct rtnl_handle *rth,
int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr *answer, size_t len)
__attribute__((warn_unused_result));
int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr *answer, size_t len)
__attribute__((warn_unused_result));
int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
__attribute__((warn_unused_result));
int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)

14
ip/iplink_vrf.c
View File

@ -13,6 +13,7 @@
#include <string.h>
#include <sys/socket.h>
#include <linux/if_link.h>
#include <errno.h>
#include "rt_names.h"
#include "utils.h"
@ -126,8 +127,14 @@ __u32 ipvrf_get_table(const char *name)
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
if (rtnl_talk(&rth, &req.n, &answer.n, sizeof(answer)) < 0)
return 0;
if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n,
&answer.n, sizeof(answer)) < 0) {
/* special case "default" vrf to be the main table */
if (errno == ENODEV && !strcmp(name, "default"))
rtnl_rttable_a2n(&tb_id, "main");
return tb_id;
}
ifi = NLMSG_DATA(&answer.n);
len = answer.n.nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
@ -186,7 +193,8 @@ int name_is_vrf(const char *name)
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1);
if (rtnl_talk(&rth, &req.n, &answer.n, sizeof(answer)) < 0)
if (rtnl_talk_suppress_rtnl_errmsg(&rth, &req.n,
&answer.n, sizeof(answer)) < 0)
return 0;
ifi = NLMSG_DATA(&answer.n);

20
lib/libnetlink.c
View File

@ -12,6 +12,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
@ -397,8 +398,9 @@ int rtnl_dump_filter_nc(struct rtnl_handle *rth,
return rtnl_dump_filter_l(rth, a);
}
int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr *answer, size_t maxlen)
static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr *answer, size_t maxlen,
bool show_rtnl_err)
{
int status;
unsigned int seq;
@ -485,7 +487,7 @@ int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
return 0;
}
if (rtnl->proto != NETLINK_SOCK_DIAG)
if (rtnl->proto != NETLINK_SOCK_DIAG && show_rtnl_err)
fprintf(stderr,
"RTNETLINK answers: %s\n",
strerror(-err->error));
@ -517,6 +519,18 @@ int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
}
}
int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr *answer, size_t maxlen)
{
return __rtnl_talk(rtnl, n, answer, maxlen, true);
}
int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
struct nlmsghdr *answer, size_t maxlen)
{
return __rtnl_talk(rtnl, n, answer, maxlen, false);
}
int rtnl_listen_all_nsid(struct rtnl_handle *rth)
{
unsigned int on = 1;