Add sendmmsg syscall

src/libos/src/net/mod.rs

@@ -7,7 +7,7 @@ pub use self::io_multiplexing::{
     PollEventFlags, PollFd, THREAD_NOTIFIERS,
 };
 pub use self::socket::{
-    msghdr, msghdr_mut, socketpair, unix_socket, AddressFamily, AsUnixSocket, FileFlags,
+    mmsghdr, msghdr, msghdr_mut, socketpair, unix_socket, AddressFamily, AsUnixSocket, FileFlags,
     HostSocket, HostSocketType, HowToShut, Iovs, IovsMut, MsgHdr, MsgHdrFlags, MsgHdrMut,
     RecvFlags, SendFlags, SliceAsLibcIovec, SockAddr, SocketType, UnixAddr,
 };

src/libos/src/net/socket/mod.rs

@@ -14,7 +14,7 @@ pub use self::address_family::AddressFamily;
 pub use self::flags::{FileFlags, MsgHdrFlags, RecvFlags, SendFlags};
 pub use self::host::{HostSocket, HostSocketType};
 pub use self::iovs::{Iovs, IovsMut, SliceAsLibcIovec};
-pub use self::msg::{msghdr, msghdr_mut, MsgHdr, MsgHdrMut};
+pub use self::msg::{mmsghdr, msghdr, msghdr_mut, MsgHdr, MsgHdrMut};
 pub use self::shutdown::HowToShut;
 pub use self::socket_address::SockAddr;
 pub use self::socket_type::SocketType;

src/libos/src/net/socket/msg.rs

@@ -14,6 +14,13 @@ pub struct msghdr {
     pub msg_flags: c_int,
 }
 
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct mmsghdr {
+    pub msg_hdr: msghdr,
+    pub msg_len: c_uint,
+}
+
 /// C struct for a socket message with mutable pointers
 #[repr(C)]
 #[derive(Debug, Copy, Clone)]

src/libos/src/net/syscalls.rs

@@ -48,7 +48,7 @@ pub fn do_bind(fd: c_int, addr: *const libc::sockaddr, addr_len: libc::socklen_t
         trace!("bind to addr: {:?}", unix_addr);
         unix_socket.bind(&unix_addr)?;
     } else {
-        return_errno!(EBADF, "not a socket");
+        return_errno!(ENOTSOCK, "not a socket");
     }
 
     Ok(0)
@@ -61,7 +61,7 @@ pub fn do_listen(fd: c_int, backlog: c_int) -> Result<isize> {
     } else if let Ok(unix_socket) = file_ref.as_unix_socket() {
         unix_socket.listen(backlog)?;
     } else {
-        return_errno!(EBADF, "not a socket");
+        return_errno!(ENOTSOCK, "not a socket");
     }
 
     Ok(0)
@@ -99,7 +99,7 @@ pub fn do_connect(
 
         unix_socket.connect(&addr)?;
     } else {
-        return_errno!(EBADF, "not a socket");
+        return_errno!(ENOTSOCK, "not a socket");
     }
 
     Ok(0)
@@ -170,7 +170,7 @@ pub fn do_accept4(
         }
         Ok(new_fd as isize)
     } else {
-        return_errno!(EBADF, "not a socket");
+        return_errno!(ENOTSOCK, "not a socket");
     }
 }
 
@@ -215,7 +215,7 @@ pub fn do_setsockopt(
         warn!("setsockopt for unix socket is unimplemented");
         Ok(0)
     } else {
-        return_errno!(EBADF, "not a socket")
+        return_errno!(ENOTSOCK, "not a socket")
     }
 }
 
@@ -275,7 +275,7 @@ pub fn do_getpeername(
         }
         Ok(0)
     } else {
-        return_errno!(EBADF, "not a socket")
+        return_errno!(ENOTSOCK, "not a socket")
     }
 }
 
@@ -322,7 +322,7 @@ pub fn do_getsockname(
         }
         Ok(0)
     } else {
-        return_errno!(EBADF, "not a socket");
+        return_errno!(ENOTSOCK, "not a socket");
     }
 }
 
@@ -440,7 +440,7 @@ pub fn do_recvfrom(
         }
         Ok(data_len as isize)
     } else {
-        return_errno!(EBADF, "not a socket");
+        return_errno!(ENOTSOCK, "not a socket");
     }
 }
 
@@ -497,9 +497,9 @@ pub fn do_sendmsg(fd: c_int, msg_ptr: *const msghdr, flags_c: c_int) -> Result<i
             .sendmsg(&msg, flags)
             .map(|bytes_sent| bytes_sent as isize)
     } else if let Ok(socket) = file_ref.as_unix_socket() {
-        return_errno!(EBADF, "does not support unix socket")
+        return_errno!(EOPNOTSUPP, "does not support unix socket")
     } else {
-        return_errno!(EBADF, "not a socket")
+        return_errno!(ENOTSOCK, "not a socket")
     }
 }
 
@@ -525,9 +525,63 @@ pub fn do_recvmsg(fd: c_int, msg_mut_ptr: *mut msghdr_mut, flags_c: c_int) -> Re
             .recvmsg(&mut msg_mut, flags)
             .map(|bytes_recvd| bytes_recvd as isize)
     } else if let Ok(socket) = file_ref.as_unix_socket() {
-        return_errno!(EBADF, "does not support unix socket")
+        return_errno!(EOPNOTSUPP, "does not support unix socket")
     } else {
-        return_errno!(EBADF, "not a socket")
+        return_errno!(ENOTSOCK, "not a socket")
+    }
+}
+
+pub fn do_sendmmsg(
+    fd: c_int,
+    msgvec_ptr: *mut mmsghdr,
+    vlen: c_uint,
+    flags_c: c_int,
+) -> Result<isize> {
+    debug!(
+        "sendmmsg: fd: {}, msg: {:?}, flags: 0x{:x}",
+        fd, msgvec_ptr, flags_c
+    );
+
+    from_user::check_ptr(msgvec_ptr)?;
+
+    let mut msgvec = unsafe { std::slice::from_raw_parts_mut(msgvec_ptr, vlen as usize) };
+    let flags = SendFlags::from_bits_truncate(flags_c);
+    let file_ref = current!().file(fd as FileDesc)?;
+
+    if let Ok(socket) = file_ref.as_host_socket() {
+        let mut send_count = 0;
+        for mmsg in (msgvec) {
+            if !mmsg.msg_hdr.check_member_ptrs().is_ok() {
+                break;
+            }
+
+            let msg = unsafe {
+                if let Ok(msg) = MsgHdr::from_c({ &mmsg.msg_hdr }) {
+                    msg
+                } else {
+                    break;
+                }
+            };
+
+            if socket
+                .sendmsg(&msg, flags)
+                .map(|bytes_sent| {
+                    mmsg.msg_len = bytes_sent as u32;
+                    mmsg.msg_len
+                })
+                .is_ok()
+            {
+                send_count += 1;
+            } else {
+                break;
+            }
+        }
+
+        Ok(send_count as isize)
+    } else if let Ok(socket) = file_ref.as_unix_socket() {
+        return_errno!(EOPNOTSUPP, "does not support unix socket")
+    } else {
+        return_errno!(ENOTSOCK, "not a socket")
     }
 }
 

src/libos/src/syscall/mod.rs

@@ -36,8 +36,8 @@ use crate::misc::{resource_t, rlimit_t, sysinfo_t, utsname_t};
 use crate::net::{
     do_accept, do_accept4, do_bind, do_connect, do_epoll_create, do_epoll_create1, do_epoll_ctl,
     do_epoll_pwait, do_epoll_wait, do_getpeername, do_getsockname, do_getsockopt, do_listen,
-    do_poll, do_recvfrom, do_recvmsg, do_select, do_sendmsg, do_sendto, do_setsockopt, do_shutdown,
-    do_socket, do_socketpair, msghdr, msghdr_mut,
+    do_poll, do_recvfrom, do_recvmsg, do_select, do_sendmmsg, do_sendmsg, do_sendto, do_setsockopt,
+    do_shutdown, do_socket, do_socketpair, mmsghdr, msghdr, msghdr_mut,
 };
 use crate::process::{
     do_arch_prctl, do_clone, do_exit, do_exit_group, do_futex, do_getegid, do_geteuid, do_getgid,
@@ -392,7 +392,7 @@ macro_rules! process_syscall_table_with_callback {
             (OpenByHandleAt = 304) => handle_unsupported(),
             (ClockAdjtime = 305) => handle_unsupported(),
             (Syncfs = 306) => handle_unsupported(),
-            (Sendmmsg = 307) => handle_unsupported(),
+            (Sendmmsg = 307) => do_sendmmsg(fd: c_int, msg_ptr: *mut mmsghdr, vlen: c_uint, flags_c: c_int),
             (Setns = 308) => handle_unsupported(),
             (Getcpu = 309) => do_getcpu(cpu_ptr: *mut u32, node_ptr: *mut u32),
             (ProcessVmReadv = 310) => handle_unsupported(),

test/client/main.c

@@ -92,6 +92,43 @@ int client_sendmsg(int server_fd, char *buf) {
     return ret;
 }
 
+#ifdef __GLIBC__
+
+struct mmsghdr {
+    struct msghdr msg;
+    unsigned int len;
+};
+
+int client_sendmmsg(int server_fd, char *buf) {
+    int ret = 0;
+    struct mmsghdr msg_v[2] = {};
+    struct iovec iov[1];
+    struct msghdr *msg_ptr = &msg_v[0].msg;
+
+    // Set msg0
+    msg_ptr->msg_name = NULL;
+    msg_ptr->msg_namelen = 0;
+    iov[0].iov_base = buf;
+    iov[0].iov_len = strlen(buf);
+    msg_ptr->msg_iov = iov;
+    msg_ptr->msg_iovlen = 1;
+    msg_ptr->msg_control = 0;
+    msg_ptr->msg_controllen = 0;
+    msg_ptr->msg_flags = 0;
+
+    // Set msg1
+    msg_v[1] = msg_v[0];
+    msg_ptr = &msg_v[1].msg;
+    msg_ptr->msg_iov = NULL;
+    msg_ptr->msg_iovlen = 0;
+
+    ret = sendmmsg(server_fd, msg_v,  2, 0);
+    if (ret != 2 || msg_v[0].len <= 0 || msg_v[1].len != 0) {
+        THROW_ERROR("sendmsg failed");
+    }
+}
+#endif
+
 int client_connectionless_sendmsg(char *buf) {
     int ret = 0;
     struct msghdr msg;
@@ -148,7 +185,12 @@ int main(int argc, const char *argv[]) {
             neogotiate_msg(server_fd, buf, buf_size);
             ret = client_sendmsg(server_fd, buf);
             break;
+#ifdef __GLIBC__
         case 8803:
+            neogotiate_msg(server_fd, buf, buf_size);
+            ret = client_sendmmsg(server_fd, buf);
+#endif
+        case 8804:
             ret = client_connectionless_sendmsg(DEFAULT_MSG);
             break;
         default:

test/server/main.c

@@ -268,13 +268,33 @@ int test_sendmsg_recvmsg() {
     return ret;
 }
 
+int test_sendmmsg_recvmsg() {
+    int ret = 0;
+    int child_pid = 0;
+    int client_fd = connect_with_child(8803, &child_pid);
+    if (client_fd < 0) {
+        THROW_ERROR("connect failed");
+    }
+
+    if (neogotiate_msg(client_fd) < 0) {
+        THROW_ERROR("neogotiate failed");
+    }
+
+    ret = server_recvmsg(client_fd);
+    if (ret < 0) { return -1; }
+
+    ret = wait_for_child_exit(child_pid);
+
+    return ret;
+}
+
 int test_sendmsg_recvmsg_connectionless() {
     int ret = 0;
     int child_pid = 0;
 
     signal(SIGCHLD, proc_exit);
 
-    char *client_argv[] = {"client", "NULL", "8803", NULL};
+    char *client_argv[] = {"client", "NULL", "8804", NULL};
     ret = posix_spawn(&child_pid, "/bin/client", NULL, NULL, client_argv, NULL);
     if (ret < 0) {
         THROW_ERROR("spawn client process error");
@@ -383,6 +403,9 @@ static test_case_t test_cases[] = {
     TEST_CASE(test_read_write),
     TEST_CASE(test_send_recv),
     TEST_CASE(test_sendmsg_recvmsg),
+#ifdef __GLIBC__
+    TEST_CASE(test_sendmmsg_recvmsg),
+#endif
     TEST_CASE(test_sendmsg_recvmsg_connectionless),
     TEST_CASE(test_fcntl_setfl_and_getfl),
     TEST_CASE(test_poll),