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ipvs: add pmtu_disc option to disable IP DF for TUN packets 

Disabling PMTU discovery can increase the output packet
rate but some users have enough resources and prefer to fragment
than to drop traffic. By default, we copy the DF bit but if
pmtu_disc is disabled we do not send FRAG_NEEDED messages anymore.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Julian Anastasov 2012-07-20 11:59:53 +03:00 committed by Simon Horman
parent f2edb9f770
commit 3654e61137
3 changed files with 22 additions and 3 deletions
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11
include/net/ip_vs.h
View File

@ -888,6 +888,7 @@ struct netns_ipvs {
unsigned int sysctl_sync_refresh_period;
int sysctl_sync_retries;
int sysctl_nat_icmp_send;
int sysctl_pmtu_disc;
/* ip_vs_lblc */
int sysctl_lblc_expiration;
@ -974,6 +975,11 @@ static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
return ipvs->sysctl_sync_sock_size;
}
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_pmtu_disc;
}
#else
static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
@ -1016,6 +1022,11 @@ static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
return 0;
}
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
{
return 1;
}
#endif
/*

8
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -1801,6 +1801,12 @@ static struct ctl_table vs_vars[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "pmtu_disc",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_IP_VS_DEBUG
{
.procname = "debug_level",
@ -3726,6 +3732,8 @@ static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
tbl[idx++].data = &ipvs->sysctl_sync_retries;
tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
ipvs->sysctl_pmtu_disc = 1;
tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);

6
net/netfilter/ipvs/ip_vs_xmit.c
View File

@ -795,6 +795,7 @@ int
ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp)
{
struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
struct rtable *rt; /* Route to the other host */
__be32 saddr; /* Source for tunnel */
struct net_device *tdev; /* Device to other host */
@ -830,10 +831,9 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
/* Copy DF, reset fragment offset and MF */
df = old_iph->frag_off & htons(IP_DF);
df = sysctl_pmtu_disc(ipvs) ? old_iph->frag_off & htons(IP_DF) : 0;
if ((old_iph->frag_off & htons(IP_DF) &&
mtu < ntohs(old_iph->tot_len) && !skb_is_gso(skb))) {
if (df && mtu < ntohs(old_iph->tot_len) && !skb_is_gso(skb)) {
icmp_send(skb, ICMP_DEST_UNREACH,ICMP_FRAG_NEEDED, htonl(mtu));
IP_VS_DBG_RL("%s(): frag needed\n", __func__);
goto tx_error_put;