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kerndat: check whether ipv6 is supported or not (v2)

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v2: use a cached value to dump ipv6 interface addesses
    call get_ipv6() from kerndat_init_rst too

Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrew Vagin 2015-11-18 14:03:15 +03:00 committed by Pavel Emelyanov
parent c0bc79d92e
commit 1648db970c
3 changed files with 23 additions and 3 deletions
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1
include/kerndat.h
View File

@ -24,6 +24,7 @@ struct kerndat_s {
bool has_memfd;
bool has_fdinfo_lock;
unsigned long task_size;
bool ipv6;
};
extern struct kerndat_s kdat;

19
kerndat.c
View File

@ -333,6 +333,21 @@ out:
return exit_code;
}
static int get_ipv6()
{
if (access("/proc/sys/net/ipv6", F_OK) < 0) {
if (errno == ENOENT) {
pr_debug("ipv6 is disabled\n");
kdat.ipv6 = false;
return 0;
}
pr_perror("Unable to access /proc/sys/net/ipv6");
return -1;
}
kdat.ipv6 = true;
return 0;
}
int kerndat_init(void)
{
int ret;
@ -348,6 +363,8 @@ int kerndat_init(void)
ret = kerndat_fdinfo_has_lock();
if (!ret)
ret = get_task_size();
if (!ret)
ret = get_ipv6();
kerndat_lsm();
@ -371,6 +388,8 @@ int kerndat_init_rst(void)
ret = kerndat_has_memfd_create();
if (!ret)
ret = get_task_size();
if (!ret)
ret = get_ipv6();
kerndat_lsm();

6
net.c
View File

@ -25,6 +25,8 @@
#include "pstree.h"
#include "string.h"
#include "sysctl.h"
#include "kerndat.h"
#include "protobuf.h"
#include "protobuf/netdev.pb-c.h"
@ -641,10 +643,8 @@ static inline int dump_route(struct cr_imgset *fds)
return -1;
/* If ipv6 is disabled, "ip -6 route dump" dumps all routes */
if (access("/proc/sys/net/ipv6/", F_OK)) {
pr_debug("ipv6 is disabled\n");
if (!kdat.ipv6)
return 0;
}
img = img_from_set(fds, CR_FD_ROUTE6);
if (run_ip_tool("-6", "route", "save", -1, img_raw_fd(img), 0))