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kerndat: check if setsockopt IPV6_FREEBIND is supported

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Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
This commit is contained in:
Pavel Tikhomirov
2022-12-02 11:21:54 +03:00
committed by Andrei Vagin
parent 14e8836564
commit f1c8d386b4
3 changed files with 43 additions and 0 deletions
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10
criu/cr-check.c
View File

@@ -1375,6 +1375,14 @@ static int check_openat2(void)
return 0;
}
static int check_ipv6_freebind(void)
{
if (!kdat.has_ipv6_freebind)
return -1;
return 0;
}
static int (*chk_feature)(void);
/*
@@ -1494,6 +1502,7 @@ int cr_check(void)
ret |= check_move_mount_set_group();
ret |= check_openat2();
ret |= check_ptrace_get_rseq_conf();
ret |= check_ipv6_freebind();
if (kdat.lsm == LSMTYPE__APPARMOR)
ret |= check_apparmor_stacking();
@@ -1614,6 +1623,7 @@ static struct feature_list feature_list[] = {
{ "move_mount_set_group", check_move_mount_set_group },
{ "openat2", check_openat2 },
{ "get_rseq_conf", check_ptrace_get_rseq_conf },
{ "ipv6_freebind", check_ipv6_freebind },
{ NULL, NULL },
};

1
criu/include/kerndat.h
View File

@@ -84,6 +84,7 @@ struct kerndat_s {
bool has_rseq;
bool has_ptrace_get_rseq_conf;
struct __ptrace_rseq_configuration libc_rseq_conf;
bool has_ipv6_freebind;
};
extern struct kerndat_s kdat;

32
criu/kerndat.c
View File

@@ -1541,6 +1541,34 @@ static int kerndat_has_nftables_concat(void)
#endif
}
#ifndef IPV6_FREEBIND
#define IPV6_FREEBIND 78
#endif
static int kerndat_has_ipv6_freebind(void)
{
int sk, val;
sk = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (sk == -1) {
pr_perror("Unable to create a ipv6 dgram socket");
return -1;
}
val = 1;
if (setsockopt(sk, SOL_IPV6, IPV6_FREEBIND, &val, sizeof(int)) == -1) {
if (errno == ENOPROTOOPT) {
kdat.has_ipv6_freebind = false;
return 0;
}
pr_perror("Unable to setsockopt ipv6_freebind");
return -1;
}
kdat.has_ipv6_freebind = true;
return 0;
}
/*
* Some features depend on resource that can be dynamically changed
* at the OS runtime. There are cases that we cannot determine the
@@ -1780,6 +1808,10 @@ int kerndat_init(void)
pr_err("kerndat_has_ptrace_get_rseq_conf failed when initializing kerndat.\n");
ret = -1;
}
if (!ret && (kerndat_has_ipv6_freebind() < 0)) {
pr_err("kerndat_has_ipv6_freebind failed when initializing kerndat.\n");
ret = -1;
}
kerndat_lsm();
kerndat_mmap_min_addr();