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core: loopback-setup - only up the loopback device

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The kernel will set up the IP addresses for us, so don't duplicate that
in userspace.
This commit is contained in:
Tom Gundersen
2014-08-08 13:09:51 +02:00
parent fa9d4be3f1
commit f3fc48150b
1 changed files with 16 additions and 113 deletions
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src/core/loopback-setup.c
+16 -113
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@@ -19,7 +19,6 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <sys/socket.h>
#include <net/if.h>
#include <asm/types.h>
@@ -35,84 +34,14 @@
#include "sd-rtnl.h"
#include "rtnl-util.h"
static int pipe_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
int *counter = userdata;
int r;
/* this is hardcoded in the kernel, so don't look it up */
#define LOOPBACK_IFINDEX 1
(*counter) --;
r = sd_rtnl_message_get_errno(m);
return r == -EEXIST ? 0 : r;
}
static int add_addresses(sd_rtnl *rtnl, int if_loopback, struct in_addr *ipv4_address, int *counter) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *ipv4 = NULL, *ipv6 = NULL;
int r;
r = sd_rtnl_message_new_addr(rtnl, &ipv4, RTM_NEWADDR, if_loopback, AF_INET);
if (r < 0)
return r;
r = sd_rtnl_message_addr_set_prefixlen(ipv4, 8);
if (r < 0)
return r;
r = sd_rtnl_message_addr_set_flags(ipv4, IFA_F_PERMANENT);
if (r < 0)
return r;
r = sd_rtnl_message_addr_set_scope(ipv4, RT_SCOPE_HOST);
if (r < 0)
return r;
r = sd_rtnl_message_append_in_addr(ipv4, IFA_LOCAL, ipv4_address);
if (r < 0)
return r;
r = sd_rtnl_call_async(rtnl, ipv4, &pipe_handler, counter, 0, NULL);
if (r < 0)
return r;
(*counter) ++;
if (!socket_ipv6_is_supported())
return 0;
r = sd_rtnl_message_new_addr(rtnl, &ipv6, RTM_NEWADDR, if_loopback, AF_INET6);
if (r < 0)
return r;
r = sd_rtnl_message_addr_set_prefixlen(ipv6, 128);
if (r < 0)
return r;
r = sd_rtnl_message_addr_set_flags(ipv6, IFA_F_PERMANENT);
if (r < 0)
return r;
r = sd_rtnl_message_addr_set_scope(ipv6, RT_SCOPE_HOST);
if (r < 0)
return r;
r = sd_rtnl_message_append_in6_addr(ipv6, IFA_LOCAL, &in6addr_loopback);
if (r < 0)
return r;
r = sd_rtnl_call_async(rtnl, ipv6, &pipe_handler, counter, 0, NULL);
if (r < 0)
return r;
(*counter) ++;
return 0;
}
static int start_interface(sd_rtnl *rtnl, int if_loopback, struct in_addr *ipv4_address, int *counter) {
static int start_loopback(sd_rtnl *rtnl) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
r = sd_rtnl_message_new_link(rtnl, &req, RTM_SETLINK, if_loopback);
r = sd_rtnl_message_new_link(rtnl, &req, RTM_SETLINK, LOOPBACK_IFINDEX);
if (r < 0)
return r;
@@ -120,12 +49,10 @@ static int start_interface(sd_rtnl *rtnl, int if_loopback, struct in_addr *ipv4_
if (r < 0)
return r;
r = sd_rtnl_call_async(rtnl, req, &pipe_handler, counter, 0, NULL);
r = sd_rtnl_call(rtnl, req, 0, NULL);
if (r < 0)
return r;
(*counter) ++;
return 0;
}
@@ -157,49 +84,25 @@ static int check_loopback(void) {
int loopback_setup(void) {
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
int r, if_loopback, counter = 0;
bool eperm = false;
struct in_addr ipv4_address;
errno = 0;
if_loopback = (int) if_nametoindex("lo");
if (if_loopback <= 0)
return errno ? -errno : -ENODEV;
ipv4_address.s_addr = htonl(INADDR_LOOPBACK);
int r;
r = sd_rtnl_open(&rtnl, 0);
if (r < 0)
return r;
r = add_addresses(rtnl, if_loopback, &ipv4_address, &counter);
if (r < 0)
return r;
r = start_interface(rtnl, if_loopback, &ipv4_address, &counter);
if (r < 0)
return r;
while (counter > 0) {
r = sd_rtnl_wait(rtnl, 0);
if (r < 0)
return r;
r = sd_rtnl_process(rtnl, 0);
if (r < 0) {
if (r == -EPERM)
eperm = true;
else {
log_warning("Failed to configure loopback device: %s", strerror(-r));
return r;
}
r = start_loopback(rtnl);
if (r == -EPERM) {
if (check_loopback() < 0) {
log_warning("Failed to configure loopback device: %s",
strerror(EPERM));
return -EPERM;
}
} else if (r < 0) {
log_warning("Failed to configure loopback device: %s",
strerror(-r));
return r;
}
if (eperm && check_loopback() < 0) {
log_warning("Failed to configure loopback device: %s", strerror(EPERM));
return -EPERM;
}
return 0;
}