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net: introduce SO_BINDTOIFINDEX sockopt 

This introduces a new generic SOL_SOCKET-level socket option called
SO_BINDTOIFINDEX. It behaves similar to SO_BINDTODEVICE, but takes a
network interface index as argument, rather than the network interface
name.

User-space often refers to network-interfaces via their index, but has
to temporarily resolve it to a name for a call into SO_BINDTODEVICE.
This might pose problems when the network-device is renamed
asynchronously by other parts of the system. When this happens, the
SO_BINDTODEVICE might either fail, or worse, it might bind to the wrong
device.

In most cases user-space only ever operates on devices which they
either manage themselves, or otherwise have a guarantee that the device
name will not change (e.g., devices that are UP cannot be renamed).
However, particularly in libraries this guarantee is non-obvious and it
would be nice if that race-condition would simply not exist. It would
make it easier for those libraries to operate even in situations where
the device-name might change under the hood.

A real use-case that we recently hit is trying to start the network
stack early in the initrd but make it survive into the real system.
Existing distributions rename network-interfaces during the transition
from initrd into the real system. This, obviously, cannot affect
devices that are up and running (unless you also consider moving them
between network-namespaces). However, the network manager now has to
make sure its management engine for dormant devices will not run in
parallel to these renames. Particularly, when you offload operations
like DHCP into separate processes, these might setup their sockets
early, and thus have to resolve the device-name possibly running into
this race-condition.

By avoiding a call to resolve the device-name, we no longer depend on
the name and can run network setup of dormant devices in parallel to
the transition off the initrd. The SO_BINDTOIFINDEX ioctl plugs this
race.

Reviewed-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Herrmann 2019-01-15 14:42:14 +01:00 committed by David S. Miller
parent 692d7b5d1f
commit f5dd3d0c96
9 changed files with 53 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/include/uapi/asm/socket.h
View File

@ -115,4 +115,6 @@
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 62
#endif /* _UAPI_ASM_SOCKET_H */

2
arch/ia64/include/uapi/asm/socket.h
View File

@ -117,4 +117,6 @@
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 62
#endif /* _ASM_IA64_SOCKET_H */

2
arch/mips/include/uapi/asm/socket.h
View File

@ -126,4 +126,6 @@
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 62
#endif /* _UAPI_ASM_SOCKET_H */

2
arch/parisc/include/uapi/asm/socket.h
View File

@ -107,4 +107,6 @@
#define SO_TXTIME 0x4036
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 0x4037
#endif /* _UAPI_ASM_SOCKET_H */

2
arch/s390/include/uapi/asm/socket.h
View File

@ -114,4 +114,6 @@
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 62
#endif /* _ASM_SOCKET_H */

2
arch/sparc/include/uapi/asm/socket.h
View File

@ -104,6 +104,8 @@
#define SO_TXTIME 0x003f
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 0x0041
/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION 0x5001
#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002

2
arch/xtensa/include/uapi/asm/socket.h
View File

@ -119,4 +119,6 @@
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 62
#endif /* _XTENSA_SOCKET_H */

2
include/uapi/asm-generic/socket.h
View File

@ -110,4 +110,6 @@
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#define SO_BINDTOIFINDEX 62
#endif /* __ASM_GENERIC_SOCKET_H */

48
net/core/sock.c
View File

@ -520,6 +520,34 @@ struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
}
EXPORT_SYMBOL(sk_dst_check);
static int sock_setbindtodevice_locked(struct sock *sk, int ifindex)
{
int ret = -ENOPROTOOPT;
#ifdef CONFIG_NETDEVICES
struct net *net = sock_net(sk);
/* Sorry... */
ret = -EPERM;
if (!ns_capable(net->user_ns, CAP_NET_RAW))
goto out;
ret = -EINVAL;
if (ifindex < 0)
goto out;
sk->sk_bound_dev_if = ifindex;
if (sk->sk_prot->rehash)
sk->sk_prot->rehash(sk);
sk_dst_reset(sk);
ret = 0;
out:
#endif
return ret;
}
static int sock_setbindtodevice(struct sock *sk, char __user *optval,
int optlen)
{
@ -529,11 +557,6 @@ static int sock_setbindtodevice(struct sock *sk, char __user *optval,
char devname[IFNAMSIZ];
int index;
/* Sorry... */
ret = -EPERM;
if (!ns_capable(net->user_ns, CAP_NET_RAW))
goto out;
ret = -EINVAL;
if (optlen < 0)
goto out;
@ -566,14 +589,9 @@ static int sock_setbindtodevice(struct sock *sk, char __user *optval,
}
lock_sock(sk);
sk->sk_bound_dev_if = index;
if (sk->sk_prot->rehash)
sk->sk_prot->rehash(sk);
sk_dst_reset(sk);
ret = sock_setbindtodevice_locked(sk, index);
release_sock(sk);
ret = 0;
out:
#endif
@ -1055,6 +1073,10 @@ set_rcvbuf:
}
break;
case SO_BINDTOIFINDEX:
ret = sock_setbindtodevice_locked(sk, val);
break;
default:
ret = -ENOPROTOOPT;
break;
@ -1399,6 +1421,10 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
SOF_TXTIME_REPORT_ERRORS : 0;
break;
case SO_BINDTOIFINDEX:
v.val = sk->sk_bound_dev_if;
break;
default:
/* We implement the SO_SNDLOWAT etc to not be settable
* (1003.1g 7).