diff options
Diffstat (limited to 'src/basic')
| -rw-r--r-- | src/basic/socket-util.c | 17 | ||||
| -rw-r--r-- | src/basic/socket-util.h | 2 |
2 files changed, 19 insertions, 0 deletions
diff --git a/src/basic/socket-util.c b/src/basic/socket-util.c index 5c829e0e7e..1662c04705 100644 --- a/src/basic/socket-util.c +++ b/src/basic/socket-util.c @@ -1060,3 +1060,20 @@ struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t leng return NULL; } + +int socket_ioctl_fd(void) { + int fd; + + /* Create a socket to invoke the various network interface ioctl()s on. Traditionally only AF_INET was good for + * that. Since kernel 4.6 AF_NETLINK works for this too. We first try to use AF_INET hence, but if that's not + * available (for example, because it is made unavailable via SECCOMP or such), we'll fall back to the more + * generic AF_NETLINK. */ + + fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0); + if (fd < 0) + fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC, NETLINK_GENERIC); + if (fd < 0) + return -errno; + + return fd; +} diff --git a/src/basic/socket-util.h b/src/basic/socket-util.h index 2536b085f9..2ef572badb 100644 --- a/src/basic/socket-util.h +++ b/src/basic/socket-util.h @@ -154,3 +154,5 @@ struct cmsghdr* cmsg_find(struct msghdr *mh, int level, int type, socklen_t leng 1 + strnlen(_sa->sun_path+1, sizeof(_sa->sun_path)-1) : \ strnlen(_sa->sun_path, sizeof(_sa->sun_path))); \ }) + +int socket_ioctl_fd(void); |