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ipv4: Namespaceify min_adv_mss sysctl knob

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Different netns has different requirement on the setting of min_adv_mss
sysctl which the advertised MSS will be never lower than.

Enable min_adv_mss to be configured per network namespace.

Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
xu xin 2022-01-26 07:10:58 +00:00 committed by David S. Miller
parent 349fdca687
commit 2e9589ff80
2 changed files with 12 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
include/net/netns/ipv4.h
View file

@ -83,6 +83,7 @@ struct netns_ipv4 {
u32 ip_rt_min_pmtu; u32 ip_rt_min_pmtu;
int ip_rt_mtu_expires; int ip_rt_mtu_expires;
int ip_rt_min_advmss;
struct local_ports ip_local_ports; struct local_ports ip_local_ports;

21
net/ipv4/route.c
View file

@ -112,14 +112,13 @@
#define DEFAULT_MIN_PMTU (512 + 20 + 20) #define DEFAULT_MIN_PMTU (512 + 20 + 20)
#define DEFAULT_MTU_EXPIRES (10 * 60 * HZ) #define DEFAULT_MTU_EXPIRES (10 * 60 * HZ)
#define DEFAULT_MIN_ADVMSS 256
static int ip_rt_max_size; static int ip_rt_max_size;
static int ip_rt_redirect_number __read_mostly = 9; static int ip_rt_redirect_number __read_mostly = 9;
static int ip_rt_redirect_load __read_mostly = HZ / 50; static int ip_rt_redirect_load __read_mostly = HZ / 50;
static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1));
static int ip_rt_error_cost __read_mostly = HZ; static int ip_rt_error_cost __read_mostly = HZ;
static int ip_rt_error_burst __read_mostly = 5 * HZ; static int ip_rt_error_burst __read_mostly = 5 * HZ;
static int ip_rt_min_advmss __read_mostly = 256;
static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT;
@ -1298,9 +1297,10 @@ static void set_class_tag(struct rtable *rt, u32 tag)
static unsigned int ipv4_default_advmss(const struct dst_entry *dst) static unsigned int ipv4_default_advmss(const struct dst_entry *dst)
{ {
struct net *net = dev_net(dst->dev);
unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr); unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr);
unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size, unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size,
ip_rt_min_advmss); net->ipv4.ip_rt_min_advmss);
return min(advmss, IPV4_MAX_PMTU - header_size); return min(advmss, IPV4_MAX_PMTU - header_size);
} }
@ -3535,13 +3535,6 @@ static struct ctl_table ipv4_route_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_dointvec, .proc_handler = proc_dointvec,
}, },
{
.procname = "min_adv_mss",
.data = &ip_rt_min_advmss,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{ } { }
}; };
@ -3569,6 +3562,13 @@ static struct ctl_table ipv4_route_netns_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_dointvec_jiffies, .proc_handler = proc_dointvec_jiffies,
}, },
{
.procname = "min_adv_mss",
.data = &init_net.ipv4.ip_rt_min_advmss,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{ }, { },
}; };
@ -3631,6 +3631,7 @@ static __net_init int netns_ip_rt_init(struct net *net)
/* Set default value for namespaceified sysctls */ /* Set default value for namespaceified sysctls */
net->ipv4.ip_rt_min_pmtu = DEFAULT_MIN_PMTU; net->ipv4.ip_rt_min_pmtu = DEFAULT_MIN_PMTU;
net->ipv4.ip_rt_mtu_expires = DEFAULT_MTU_EXPIRES; net->ipv4.ip_rt_mtu_expires = DEFAULT_MTU_EXPIRES;
net->ipv4.ip_rt_min_advmss = DEFAULT_MIN_ADVMSS;
return 0; return 0;
} }