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udp: add gso segment cmsg 

Allow specifying segment size in the send call.

The new control message performs the same function as socket option
UDP_SEGMENT while avoiding the extra system call.

[ Export udp_cmsg_send for ipv6. -DaveM ]

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2018-04-26 13:42:20 -04:00 committed by David S. Miller
parent 15e36f5b8e
commit 2e8de85763
3 changed files with 47 additions and 3 deletions
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1
include/net/udp.h
View File

@ -273,6 +273,7 @@ int udp_abort(struct sock *sk, int err);
int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
int udp_push_pending_frames(struct sock *sk);
void udp_flush_pending_frames(struct sock *sk);
int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size);
void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
int udp_rcv(struct sk_buff *skb);
int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);

44
net/ipv4/udp.c
View File

@ -853,6 +853,43 @@ out:
}
EXPORT_SYMBOL(udp_push_pending_frames);
static int __udp_cmsg_send(struct cmsghdr *cmsg, u16 *gso_size)
{
switch (cmsg->cmsg_type) {
case UDP_SEGMENT:
if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u16)))
return -EINVAL;
*gso_size = *(__u16 *)CMSG_DATA(cmsg);
return 0;
default:
return -EINVAL;
}
}
int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size)
{
struct cmsghdr *cmsg;
bool need_ip = false;
int err;
for_each_cmsghdr(cmsg, msg) {
if (!CMSG_OK(msg, cmsg))
return -EINVAL;
if (cmsg->cmsg_level != SOL_UDP) {
need_ip = true;
continue;
}
err = __udp_cmsg_send(cmsg, gso_size);
if (err)
return err;
}
return need_ip;
}
EXPORT_SYMBOL_GPL(udp_cmsg_send);
int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
{
struct inet_sock *inet = inet_sk(sk);
@ -941,8 +978,11 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
ipc.gso_size = up->gso_size;
if (msg->msg_controllen) {
err = ip_cmsg_send(sk, msg, &ipc, sk->sk_family == AF_INET6);
if (unlikely(err)) {
err = udp_cmsg_send(sk, msg, &ipc.gso_size);
if (err > 0)
err = ip_cmsg_send(sk, msg, &ipc,
sk->sk_family == AF_INET6);
if (unlikely(err < 0)) {
kfree(ipc.opt);
return err;
}

5
net/ipv6/udp.c
View File

@ -1276,7 +1276,10 @@ do_udp_sendmsg:
opt->tot_len = sizeof(*opt);
ipc6.opt = opt;
err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
err = udp_cmsg_send(sk, msg, &ipc6.gso_size);
if (err > 0)
err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6,
&ipc6, &sockc);
if (err < 0) {
fl6_sock_release(flowlabel);
return err;