diff options
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/geneve.c | 48 | ||||
| -rw-r--r-- | drivers/net/macsec.c | 2 | ||||
| -rw-r--r-- | drivers/net/macvlan.c | 8 | ||||
| -rw-r--r-- | drivers/net/ntb_netdev.c | 3 | ||||
| -rw-r--r-- | drivers/net/tun.c | 20 | ||||
| -rw-r--r-- | drivers/net/veth.c | 17 | ||||
| -rw-r--r-- | drivers/net/vxlan.c | 64 |
7 files changed, 74 insertions, 88 deletions
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index 3c20e87bb761..752bcaa852e4 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -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; diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c index 3ea47f28e143..1a134cb2d52c 100644 --- a/drivers/net/macsec.c +++ b/drivers/net/macsec.c @@ -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; diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 3234fcdea317..a0644158647a 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -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); diff --git a/drivers/net/ntb_netdev.c b/drivers/net/ntb_netdev.c index a9acf7156855..36877ba65516 100644 --- a/drivers/net/ntb_netdev.c +++ b/drivers/net/ntb_netdev.c @@ -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) { diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 8093e39ae263..93285687cf13 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -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 */ diff --git a/drivers/net/veth.c b/drivers/net/veth.c index fbc853e64531..0520952aa096 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -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; diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index e7d16687538b..c0170b6956bb 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -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) |