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server: Use SO_BINDTODEVICE in bind_to_index() if possible. 

Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Paul Gofman 2021-10-12 21:48:42 +03:00 committed by Alexandre Julliard
parent 9f493b0ed8
commit 5f916f7f35
1 changed files with 39 additions and 35 deletions
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74
server/sock.c
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@ -1757,12 +1757,21 @@ static int accept_into_socket( struct sock *sock, struct sock *acceptsock )
#ifdef IP_BOUND_IF
static int bind_to_index( int fd, in_addr_t bind_addr, unsigned int index )
static int bind_to_iface_name( int fd, in_addr_t bind_addr, const char *name )
{
return setsockopt( fd, IPPROTO_IP, IP_BOUND_IF, &index, sizeof(index) );
static const int enable = 1;
unsigned int index;
if (!(index = if_nametoindex( name )))
return -1;
if (setsockopt( fd, IPPROTO_IP, IP_BOUND_IF, &index, sizeof(index) ))
return -1;
return setsockopt( fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable) );
}
#elif defined(IP_UNICAST_IF) && defined(SO_ATTACH_FILTER)
#elif defined(IP_UNICAST_IF) && defined(SO_ATTACH_FILTER) && defined(SO_BINDTODEVICE)
struct interface_filter
{
@ -1795,27 +1804,43 @@ static struct interface_filter generic_interface_filter =
BPF_STMT(BPF_RET+BPF_K, 0) /* dump packet */
};
static int bind_to_index( int fd, in_addr_t bind_addr, unsigned int index )
static int bind_to_iface_name( int fd, in_addr_t bind_addr, const char *name )
{
in_addr_t ifindex = htonl( index );
struct interface_filter specific_interface_filter;
struct sock_fprog filter_prog;
int ret;
static const int enable = 1;
unsigned int index;
in_addr_t ifindex;
if ((ret = setsockopt( fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex) )) < 0)
return ret;
if (!setsockopt( fd, SOL_SOCKET, SO_BINDTODEVICE, name, strlen( name ) + 1 ))
return 0;
/* SO_BINDTODEVICE requires NET_CAP_RAW until Linux 5.7. */
if (debug_level)
fprintf( stderr, "setsockopt SO_BINDTODEVICE fd %d, name %s failed: %s, falling back to SO_REUSE_ADDR\n",
fd, name, strerror( errno ));
if (!(index = if_nametoindex( name )))
return -1;
ifindex = htonl( index );
if (setsockopt( fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex) ) < 0)
return -1;
specific_interface_filter = generic_interface_filter;
specific_interface_filter.iface_rule.k = index;
specific_interface_filter.ip_rule.k = htonl( bind_addr );
filter_prog.len = sizeof(generic_interface_filter) / sizeof(struct sock_filter);
filter_prog.filter = (struct sock_filter *)&specific_interface_filter;
return setsockopt( fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog, sizeof(filter_prog) );
if (setsockopt( fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog, sizeof(filter_prog) ))
return -1;
return setsockopt( fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable) );
}
#else
static int bind_to_index( int fd, in_addr_t bind_addr, unsigned int index )
static int bind_to_iface_name( int fd, in_addr_t bind_addr, const char *name )
{
errno = EOPNOTSUPP;
return -1;
@ -1841,8 +1866,7 @@ static int bind_to_interface( struct sock *sock, const struct sockaddr_in *addr
in_addr_t bind_addr = addr->sin_addr.s_addr;
struct ifaddrs *ifaddrs, *ifaddr;
int fd = get_unix_fd( sock->fd );
static const int enable = 1;
unsigned int index;
int err = 0;
if (bind_addr == htonl( INADDR_ANY ) || bind_addr == htonl( INADDR_LOOPBACK ))
return 0;
@ -1856,36 +1880,16 @@ static int bind_to_interface( struct sock *sock, const struct sockaddr_in *addr
if (ifaddr->ifa_addr && ifaddr->ifa_addr->sa_family == AF_INET
&& ((struct sockaddr_in *)ifaddr->ifa_addr)->sin_addr.s_addr == bind_addr)
{
index = if_nametoindex( ifaddr->ifa_name );
if (!index)
{
if (debug_level)
fprintf( stderr, "Unable to look up interface index for %s: %s\n",
ifaddr->ifa_name, strerror( errno ) );
continue;
}
freeifaddrs( ifaddrs );
if (bind_to_index( fd, bind_addr, index ) < 0)
if ((err = bind_to_iface_name( fd, bind_addr, ifaddr->ifa_name )) < 0)
{
if (debug_level)
fprintf( stderr, "failed to bind to interface: %s\n", strerror( errno ) );
return 0;
}
if (setsockopt( fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable) ) < 0)
{
if (debug_level)
fprintf( stderr, "failed to reuse address: %s\n", strerror( errno ) );
return 0;
}
return 1;
break;
}
}
freeifaddrs( ifaddrs );
return 0;
return !err;
}
#ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID