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socket: fix IPv6 availability detection

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If IPv6 is loaded with disable=1, any IPv6 functionality is completely
disabled until the ipv6 module is reloaded. Do not assume IPv6 is available just
because the module is present. Fixes startup error:

Oct 27 20:58:02 cooker kernel: IPv6: Loaded, but administratively disabled, reboot required to enable
Oct 27 20:58:02 cooker kernel: systemd[1]: Set hostname to <cooker>.
Oct 27 20:58:02 cooker kernel: systemd[1]: Netlink failure for request 2: Operation not supported
Oct 27 20:58:02 cooker kernel: systemd[1]: Failed to configure loopback device: Operation not supported
This commit is contained in:
Andrey Borzenkov 2010-10-27 21:40:31 +04:00 committed by Lennart Poettering
parent 6c5d4a999c
commit f89f1e8f83
1 changed files with 15 additions and 1 deletions
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16
src/socket-util.c
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@ -506,7 +506,21 @@ bool socket_address_needs_mount(const SocketAddress *a, const char *prefix) {
}
bool socket_ipv6_is_supported(void) {
return access("/sys/module/ipv6", F_OK) == 0;
char *l = 0;
bool enabled;
if (access("/sys/module/ipv6", F_OK) != 0)
return 0;
/* If we can't check "disable" parameter, assume enabled */
if (read_one_line_file("/sys/module/ipv6/parameters/disable", &l) < 0)
return 1;
/* If module was loaded with disable=1 no IPv6 available */
enabled = l[0] == '0';
free(l);
return enabled;
}
static const char* const socket_address_bind_ipv6_only_table[_SOCKET_ADDRESS_BIND_IPV6_ONLY_MAX] = {