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[TCP]: Allow choosing TCP congestion control via sockopt.

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Allow using setsockopt to set TCP congestion control to use on a per
socket basis.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2005-06-23 20:37:36 -07:00 • committed by David S. Miller
parent 51b0bdedb8
commit 5f8ef48d24
6 changed files with 79 additions and 6 deletions
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31
net/ipv4/tcp.c
View file

@ -1927,6 +1927,25 @@ int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
return tp->af_specific->setsockopt(sk, level, optname,
optval, optlen);
/* This is a string value all the others are int's */
if (optname == TCP_CONGESTION) {
char name[TCP_CA_NAME_MAX];
if (optlen < 1)
return -EINVAL;
val = strncpy_from_user(name, optval,
min(TCP_CA_NAME_MAX-1, optlen));
if (val < 0)
return -EFAULT;
name[val] = 0;
lock_sock(sk);
err = tcp_set_congestion_control(tp, name);
release_sock(sk);
return err;
}
if (optlen < sizeof(int))
return -EINVAL;
@ -2211,6 +2230,16 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
case TCP_QUICKACK:
val = !tp->ack.pingpong;
break;
case TCP_CONGESTION:
if (get_user(len, optlen))
return -EFAULT;
len = min_t(unsigned int, len, TCP_CA_NAME_MAX);
if (put_user(len, optlen))
return -EFAULT;
if (copy_to_user(optval, tp->ca_ops->name, len))
return -EFAULT;
return 0;
default:
return -ENOPROTOOPT;
};
@ -2224,7 +2253,7 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
extern void __skb_cb_too_small_for_tcp(int, int);
extern void tcpdiag_init(void);
extern struct tcp_congestion_ops tcp_reno;
static __initdata unsigned long thash_entries;
static int __init set_thash_entries(char *str)