7663d52209
It's currently possible to create an altname conflicting
with an altname or real name of another device by creating
it in another netns and moving it over:
[ ~]$ ip link add dev eth0 type dummy
[ ~]$ ip netns add test
[ ~]$ ip -netns test link add dev ethX netns test type dummy
[ ~]$ ip -netns test link property add dev ethX altname eth0
[ ~]$ ip -netns test link set dev ethX netns 1
[ ~]$ ip link
...
3: eth0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether 02:40:88:62:ec:b8 brd ff:ff:ff:ff:ff:ff
...
5: ethX: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether 26:b7:28:78:38:0f brd ff:ff:ff:ff:ff:ff
altname eth0
Create a macro for walking the altnames, this hopefully makes
it clearer that the list we walk contains only altnames.
Which is otherwise not entirely intuitive.
Fixes: 36fbf1e52bd3 ("net: rtnetlink: add linkprop commands to add and delete alternative ifnames")
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _NET_CORE_DEV_H
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#define _NET_CORE_DEV_H
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#include <linux/types.h>
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struct net;
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struct net_device;
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struct netdev_bpf;
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struct netdev_phys_item_id;
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struct netlink_ext_ack;
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struct cpumask;
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/* Random bits of netdevice that don't need to be exposed */
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#define FLOW_LIMIT_HISTORY (1 << 7) /* must be ^2 and !overflow buckets */
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struct sd_flow_limit {
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u64 count;
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unsigned int num_buckets;
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unsigned int history_head;
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u16 history[FLOW_LIMIT_HISTORY];
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u8 buckets[];
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};
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extern int netdev_flow_limit_table_len;
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#ifdef CONFIG_PROC_FS
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int __init dev_proc_init(void);
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#else
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#define dev_proc_init() 0
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#endif
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void linkwatch_init_dev(struct net_device *dev);
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void linkwatch_forget_dev(struct net_device *dev);
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void linkwatch_run_queue(void);
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void dev_addr_flush(struct net_device *dev);
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int dev_addr_init(struct net_device *dev);
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void dev_addr_check(struct net_device *dev);
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/* sysctls not referred to from outside net/core/ */
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extern int netdev_budget;
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extern unsigned int netdev_budget_usecs;
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extern unsigned int sysctl_skb_defer_max;
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extern int netdev_tstamp_prequeue;
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extern int netdev_unregister_timeout_secs;
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extern int weight_p;
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extern int dev_weight_rx_bias;
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extern int dev_weight_tx_bias;
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/* rtnl helpers */
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extern struct list_head net_todo_list;
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void netdev_run_todo(void);
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/* netdev management, shared between various uAPI entry points */
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struct netdev_name_node {
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struct hlist_node hlist;
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struct list_head list;
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struct net_device *dev;
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const char *name;
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};
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int netdev_get_name(struct net *net, char *name, int ifindex);
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int dev_change_name(struct net_device *dev, const char *newname);
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#define netdev_for_each_altname(dev, namenode) \
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list_for_each_entry((namenode), &(dev)->name_node->list, list)
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int netdev_name_node_alt_create(struct net_device *dev, const char *name);
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int netdev_name_node_alt_destroy(struct net_device *dev, const char *name);
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int dev_validate_mtu(struct net_device *dev, int mtu,
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struct netlink_ext_ack *extack);
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int dev_set_mtu_ext(struct net_device *dev, int mtu,
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struct netlink_ext_ack *extack);
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int dev_get_phys_port_id(struct net_device *dev,
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struct netdev_phys_item_id *ppid);
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int dev_get_phys_port_name(struct net_device *dev,
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char *name, size_t len);
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int dev_change_proto_down(struct net_device *dev, bool proto_down);
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void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask,
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u32 value);
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typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
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int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
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int fd, int expected_fd, u32 flags);
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int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len);
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void dev_set_group(struct net_device *dev, int new_group);
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int dev_change_carrier(struct net_device *dev, bool new_carrier);
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void __dev_set_rx_mode(struct net_device *dev);
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void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
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unsigned int gchanges, u32 portid,
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const struct nlmsghdr *nlh);
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void unregister_netdevice_many_notify(struct list_head *head,
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u32 portid, const struct nlmsghdr *nlh);
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static inline void netif_set_gso_max_size(struct net_device *dev,
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unsigned int size)
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{
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/* dev->gso_max_size is read locklessly from sk_setup_caps() */
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WRITE_ONCE(dev->gso_max_size, size);
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if (size <= GSO_LEGACY_MAX_SIZE)
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WRITE_ONCE(dev->gso_ipv4_max_size, size);
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}
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static inline void netif_set_gso_max_segs(struct net_device *dev,
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unsigned int segs)
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{
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/* dev->gso_max_segs is read locklessly from sk_setup_caps() */
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WRITE_ONCE(dev->gso_max_segs, segs);
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}
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static inline void netif_set_gro_max_size(struct net_device *dev,
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unsigned int size)
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{
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/* This pairs with the READ_ONCE() in skb_gro_receive() */
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WRITE_ONCE(dev->gro_max_size, size);
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if (size <= GRO_LEGACY_MAX_SIZE)
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WRITE_ONCE(dev->gro_ipv4_max_size, size);
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}
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static inline void netif_set_gso_ipv4_max_size(struct net_device *dev,
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unsigned int size)
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{
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/* dev->gso_ipv4_max_size is read locklessly from sk_setup_caps() */
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WRITE_ONCE(dev->gso_ipv4_max_size, size);
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}
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static inline void netif_set_gro_ipv4_max_size(struct net_device *dev,
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unsigned int size)
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{
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/* This pairs with the READ_ONCE() in skb_gro_receive() */
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WRITE_ONCE(dev->gro_ipv4_max_size, size);
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}
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int rps_cpumask_housekeeping(struct cpumask *mask);
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#endif
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