net: Allow MSG_EOR in each msghdr of sendmmsg

This patch allows setting MSG_EOR in each individual msghdr passed
in sendmmsg. This allows a sendmmsg to send multiple messages when
using SOCK_SEQPACKET.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/socket.c b/net/socket.c
index 38a78d4..0dd4dd8 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -1875,7 +1875,8 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
 
 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
                         struct msghdr *msg_sys, unsigned int flags,
-                        struct used_address *used_address)
+                        struct used_address *used_address,
+                        unsigned int allowed_msghdr_flags)
 {
        struct compat_msghdr __user *msg_compat =
            (struct compat_msghdr __user *)msg;
@@ -1901,6 +1902,7 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
 
        if (msg_sys->msg_controllen > INT_MAX)
                goto out_freeiov;
+       flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
        ctl_len = msg_sys->msg_controllen;
        if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
                err =
@@ -1979,7 +1981,7 @@ long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
        if (!sock)
                goto out;
 
-       err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
+       err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0);
 
        fput_light(sock->file, fput_needed);
 out:
@@ -2024,7 +2026,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
        while (datagrams < vlen) {
                if (MSG_CMSG_COMPAT & flags) {
                        err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
-                                            &msg_sys, flags, &used_address);
+                                            &msg_sys, flags, &used_address, MSG_EOR);
                        if (err < 0)
                                break;
                        err = __put_user(err, &compat_entry->msg_len);
@@ -2032,7 +2034,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
                } else {
                        err = ___sys_sendmsg(sock,
                                             (struct user_msghdr __user *)entry,
-                                            &msg_sys, flags, &used_address);
+                                            &msg_sys, flags, &used_address, MSG_EOR);
                        if (err < 0)
                                break;
                        err = put_user(err, &entry->msg_len);