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Commit 91572088 authored by Jarod Wilson's avatar Jarod Wilson Committed by David S. Miller
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net: use core MTU range checking in core net infra 

geneve:
- Merge __geneve_change_mtu back into geneve_change_mtu, set max_mtu
- This one isn't quite as straight-forward as others, could use some
  closer inspection and testing

macvlan:
- set min/max_mtu

tun:
- set min/max_mtu, remove tun_net_change_mtu

vxlan:
- Merge __vxlan_change_mtu back into vxlan_change_mtu
- Set max_mtu to IP_MAX_MTU and retain dynamic MTU range checks in
  change_mtu function
- This one is also not as straight-forward and could use closer inspection
  and testing from vxlan folks

bridge:
- set max_mtu of IP_MAX_MTU and retain dynamic MTU range checks in
  change_mtu function

openvswitch:
- set min/max_mtu, remove internal_dev_change_mtu
- note: max_mtu wasn't checked previously, it's been set to 65535, which
  is the largest possible size supported

sch_teql:
- set min/max_mtu (note: max_mtu previously unchecked, used max of 65535)

macsec:
- min_mtu = 0, max_mtu = 65535

macvlan:
- min_mtu = 0, max_mtu = 65535

ntb_netdev:
- min_mtu = 0, max_mtu = 65535

veth:
- min_mtu = 68, max_mtu = 65535

8021q:
- min_mtu = 0, max_mtu = 65535

CC: netdev@vger.kernel.org
CC: Nicolas Dichtel <nicolas.dichtel@6wind.com>
CC: Hannes Frederic Sowa <hannes@stressinduktion.org>
CC: Tom Herbert <tom@herbertland.com>
CC: Daniel Borkmann <daniel@iogearbox.net>
CC: Alexander Duyck <alexander.h.duyck@intel.com>
CC: Paolo Abeni <pabeni@redhat.com>
CC: Jiri Benc <jbenc@redhat.com>
CC: WANG Cong <xiyou.wangcong@gmail.com>
CC: Roopa Prabhu <roopa@cumulusnetworks.com>
CC: Pravin B Shelar <pshelar@ovn.org>
CC: Sabrina Dubroca <sd@queasysnail.net>
CC: Patrick McHardy <kaber@trash.net>
CC: Stephen Hemminger <stephen@networkplumber.org>
CC: Pravin Shelar <pshelar@nicira.com>
CC: Maxim Krasnyansky <maxk@qti.qualcomm.com>
Signed-off-by: default avatarJarod Wilson <jarod@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8b6b4135
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Showing with 81 additions and 102 deletions
drivers/net/geneve.c
View file @ 91572088
......@@ -1034,39 +1034,18 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
return geneve_xmit_skb(skb, dev, info);
}
static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
static int geneve_change_mtu(struct net_device *dev, int new_mtu)
{
struct geneve_dev *geneve = netdev_priv(dev);
/* The max_mtu calculation does not take account of GENEVE
* options, to avoid excluding potentially valid
* configurations.
/* Only possible if called internally, ndo_change_mtu path's new_mtu
* is guaranteed to be between dev->min_mtu and dev->max_mtu.
*/
int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
if (geneve->remote.sa.sa_family == AF_INET6)
max_mtu -= sizeof(struct ipv6hdr);
else
max_mtu -= sizeof(struct iphdr);
if (new_mtu < 68)
return -EINVAL;
if (new_mtu > max_mtu) {
if (strict)
return -EINVAL;
new_mtu = max_mtu;
}
if (new_mtu > dev->max_mtu)
new_mtu = dev->max_mtu;
dev->mtu = new_mtu;
return 0;
}
static int geneve_change_mtu(struct net_device *dev, int new_mtu)
{
return __geneve_change_mtu(dev, new_mtu, true);
}
static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
struct ip_tunnel_info *info = skb_tunnel_info(skb);
......@@ -1170,6 +1149,14 @@ static void geneve_setup(struct net_device *dev)
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
/* MTU range: 68 - (something less than 65535) */
dev->min_mtu = ETH_MIN_MTU;
/* The max_mtu calculation does not take account of GENEVE
* options, to avoid excluding potentially valid
* configurations. This will be further reduced by IPvX hdr size.
*/
dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
netif_keep_dst(dev);
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
......@@ -1285,10 +1272,13 @@ static int geneve_configure(struct net *net, struct net_device *dev,
/* make enough headroom for basic scenario */
encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
if (remote->sa.sa_family == AF_INET)
if (remote->sa.sa_family == AF_INET) {
encap_len += sizeof(struct iphdr);
else
dev->max_mtu -= sizeof(struct iphdr);
} else {
encap_len += sizeof(struct ipv6hdr);
dev->max_mtu -= sizeof(struct ipv6hdr);
}
dev->needed_headroom = encap_len + ETH_HLEN;
if (metadata) {
......@@ -1488,7 +1478,7 @@ struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
/* openvswitch users expect packet sizes to be unrestricted,
* so set the largest MTU we can.
*/
err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
err = geneve_change_mtu(dev, IP_MAX_MTU);
if (err)
goto err;
......
drivers/net/macsec.c
View file @ 91572088
......@@ -2970,6 +2970,8 @@ static void macsec_free_netdev(struct net_device *dev)
static void macsec_setup(struct net_device *dev)
{
ether_setup(dev);
dev->min_mtu = 0;
dev->max_mtu = ETH_MAX_MTU;
dev->priv_flags |= IFF_NO_QUEUE;
dev->netdev_ops = &macsec_netdev_ops;
dev->destructor = macsec_free_netdev;
......
drivers/net/macvlan.c
View file @ 91572088
......@@ -777,7 +777,7 @@ static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
{
struct macvlan_dev *vlan = netdev_priv(dev);
if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
if (vlan->lowerdev->mtu < new_mtu)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
......@@ -1085,6 +1085,8 @@ void macvlan_common_setup(struct net_device *dev)
{
ether_setup(dev);
dev->min_mtu = 0;
dev->max_mtu = ETH_MAX_MTU;
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
netif_keep_dst(dev);
dev->priv_flags |= IFF_UNICAST_FLT;
......@@ -1297,6 +1299,10 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
else if (dev->mtu > lowerdev->mtu)
return -EINVAL;
/* MTU range: 68 - lowerdev->max_mtu */
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = lowerdev->max_mtu;
if (!tb[IFLA_ADDRESS])
eth_hw_addr_random(dev);
......
drivers/net/ntb_netdev.c
View file @ 91572088
......@@ -433,6 +433,9 @@ static int ntb_netdev_probe(struct device *client_dev)
ndev->netdev_ops = &ntb_netdev_ops;
ndev->ethtool_ops = &ntb_ethtool_ops;
ndev->min_mtu = 0;
ndev->max_mtu = ETH_MAX_MTU;
dev->qp = ntb_transport_create_queue(ndev, client_dev,
&ntb_netdev_handlers);
if (!dev->qp) {
......
drivers/net/tun.c
View file @ 91572088
......@@ -925,18 +925,6 @@ static void tun_net_mclist(struct net_device *dev)
*/
}
#define MIN_MTU 68
#define MAX_MTU 65535
static int
tun_net_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static netdev_features_t tun_net_fix_features(struct net_device *dev,
netdev_features_t features)
{
......@@ -1014,7 +1002,6 @@ static const struct net_device_ops tun_netdev_ops = {
.ndo_open = tun_net_open,
.ndo_stop = tun_net_close,
.ndo_start_xmit = tun_net_xmit,
.ndo_change_mtu = tun_net_change_mtu,
.ndo_fix_features = tun_net_fix_features,
.ndo_select_queue = tun_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
......@@ -1029,7 +1016,6 @@ static const struct net_device_ops tap_netdev_ops = {
.ndo_open = tun_net_open,
.ndo_stop = tun_net_close,
.ndo_start_xmit = tun_net_xmit,
.ndo_change_mtu = tun_net_change_mtu,
.ndo_fix_features = tun_net_fix_features,
.ndo_set_rx_mode = tun_net_mclist,
.ndo_set_mac_address = eth_mac_addr,
......@@ -1062,6 +1048,9 @@ static void tun_flow_uninit(struct tun_struct *tun)
tun_flow_flush(tun);
}
#define MIN_MTU 68
#define MAX_MTU 65535
/* Initialize net device. */
static void tun_net_init(struct net_device *dev)
{
......@@ -1092,6 +1081,9 @@ static void tun_net_init(struct net_device *dev)
break;
}
dev->min_mtu = MIN_MTU;
dev->max_mtu = MAX_MTU - dev->hard_header_len;
}
/* Character device part */
......
drivers/net/veth.c
View file @ 91572088
......@@ -23,9 +23,6 @@
#define DRV_NAME "veth"
#define DRV_VERSION "1.0"
#define MIN_MTU 68 /* Min L3 MTU */
#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
struct pcpu_vstats {
u64 packets;
u64 bytes;
......@@ -216,17 +213,9 @@ static int veth_close(struct net_device *dev)
return 0;
}
static int is_valid_veth_mtu(int new_mtu)
static int is_valid_veth_mtu(int mtu)
{
return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
}
static int veth_change_mtu(struct net_device *dev, int new_mtu)
{
if (!is_valid_veth_mtu(new_mtu))
return -EINVAL;
dev->mtu = new_mtu;
return 0;
return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU;
}
static int veth_dev_init(struct net_device *dev)
......@@ -300,7 +289,6 @@ static const struct net_device_ops veth_netdev_ops = {
.ndo_open = veth_open,
.ndo_stop = veth_close,
.ndo_start_xmit = veth_xmit,
.ndo_change_mtu = veth_change_mtu,
.ndo_get_stats64 = veth_get_stats64,
.ndo_set_rx_mode = veth_set_multicast_list,
.ndo_set_mac_address = eth_mac_addr,
......@@ -337,6 +325,7 @@ static void veth_setup(struct net_device *dev)
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_STAG_RX);
dev->destructor = veth_dev_free;
dev->max_mtu = ETH_MAX_MTU;
dev->hw_features = VETH_FEATURES;
dev->hw_enc_features = VETH_FEATURES;
......
drivers/net/vxlan.c
View file @ 91572088
......@@ -2367,43 +2367,31 @@ static void vxlan_set_multicast_list(struct net_device *dev)
{
}
static int __vxlan_change_mtu(struct net_device *dev,
struct net_device *lowerdev,
struct vxlan_rdst *dst, int new_mtu, bool strict)
static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
{
int max_mtu = IP_MAX_MTU;
if (lowerdev)
max_mtu = lowerdev->mtu;
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
dst->remote_ifindex);
bool use_ipv6 = false;
if (dst->remote_ip.sa.sa_family == AF_INET6)
max_mtu -= VXLAN6_HEADROOM;
else
max_mtu -= VXLAN_HEADROOM;
if (new_mtu < 68)
return -EINVAL;
use_ipv6 = true;
if (new_mtu > max_mtu) {
if (strict)
/* This check is different than dev->max_mtu, because it looks at
* the lowerdev->mtu, rather than the static dev->max_mtu
*/
if (lowerdev) {
int max_mtu = lowerdev->mtu -
(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
if (new_mtu > max_mtu)
return -EINVAL;
new_mtu = max_mtu;
}
dev->mtu = new_mtu;
return 0;
}
static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
dst->remote_ifindex);
return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
}
static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
......@@ -2795,6 +2783,10 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
vxlan_ether_setup(dev);
}
/* MTU range: 68 - 65535 */
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU;
vxlan->net = src_net;
dst->remote_vni = conf->vni;
......@@ -2838,7 +2830,8 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
#endif
if (!conf->mtu)
dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
dev->mtu = lowerdev->mtu -
(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
needed_headroom = lowerdev->hard_header_len;
} else if (vxlan_addr_multicast(&dst->remote_ip)) {
......@@ -2847,9 +2840,20 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
}
if (conf->mtu) {
err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
if (err)
return err;
int max_mtu = ETH_MAX_MTU;
if (lowerdev)
max_mtu = lowerdev->mtu;
max_mtu -= (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
if (conf->mtu < dev->min_mtu || conf->mtu > dev->max_mtu)
return -EINVAL;
dev->mtu = conf->mtu;
if (conf->mtu > max_mtu)
dev->mtu = max_mtu;
}
if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
......
net/8021q/vlan_dev.c
View file @ 91572088
......@@ -826,5 +826,8 @@ void vlan_setup(struct net_device *dev)
dev->destructor = vlan_dev_free;
dev->ethtool_ops = &vlan_ethtool_ops;
dev->min_mtu = 0;
dev->max_mtu = ETH_MAX_MTU;
eth_zero_addr(dev->broadcast);
}
net/bridge/br_device.c
View file @ 91572088
......@@ -185,7 +185,7 @@ static struct rtnl_link_stats64 *br_get_stats64(struct net_device *dev,
static int br_change_mtu(struct net_device *dev, int new_mtu)
{
struct net_bridge *br = netdev_priv(dev);
if (new_mtu < 68 || new_mtu > br_min_mtu(br))
if (new_mtu > br_min_mtu(br))
return -EINVAL;
dev->mtu = new_mtu;
......@@ -410,6 +410,7 @@ void br_dev_setup(struct net_device *dev)
br->bridge_hello_time = br->hello_time = 2 * HZ;
br->bridge_forward_delay = br->forward_delay = 15 * HZ;
br->ageing_time = BR_DEFAULT_AGEING_TIME;
dev->max_mtu = ETH_MAX_MTU;
br_netfilter_rtable_init(br);
br_stp_timer_init(br);
......
net/openvswitch/vport-internal_dev.c
View file @ 91572088
......@@ -89,15 +89,6 @@ static const struct ethtool_ops internal_dev_ethtool_ops = {
.get_link = ethtool_op_get_link,
};
static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
{
if (new_mtu < 68)
return -EINVAL;
netdev->mtu = new_mtu;
return 0;
}
static void internal_dev_destructor(struct net_device *dev)
{
struct vport *vport = ovs_internal_dev_get_vport(dev);
......@@ -148,7 +139,6 @@ static const struct net_device_ops internal_dev_netdev_ops = {
.ndo_stop = internal_dev_stop,
.ndo_start_xmit = internal_dev_xmit,
.ndo_set_mac_address = eth_mac_addr,
.ndo_change_mtu = internal_dev_change_mtu,
.ndo_get_stats64 = internal_get_stats,
.ndo_set_rx_headroom = internal_set_rx_headroom,
};
......
net/sched/sch_teql.c
View file @ 91572088
......@@ -418,9 +418,6 @@ static int teql_master_mtu(struct net_device *dev, int new_mtu)
struct teql_master *m = netdev_priv(dev);
struct Qdisc *q;
if (new_mtu < 68)
return -EINVAL;
q = m->slaves;
if (q) {
do {
......@@ -460,6 +457,8 @@ static __init void teql_master_setup(struct net_device *dev)
dev->netdev_ops = &teql_netdev_ops;
dev->type = ARPHRD_VOID;
dev->mtu = 1500;
dev->min_mtu = 68;
dev->max_mtu = 65535;
dev->tx_queue_len = 100;
dev->flags = IFF_NOARP;
dev->hard_header_len = LL_MAX_HEADER;
......
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