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d5ec8d91f8
rtnl_link_unregister() holds RTNL and calls __rtnl_link_unregister(),
where we call synchronize_srcu() to wait inflight RTM_NEWLINK requests
for per-netns RTNL.
We put synchronize_srcu() in __rtnl_link_unregister() due to ifb.ko
and dummy.ko.
However, rtnl_newlink() will acquire SRCU before RTNL later in this
series. Then, lockdep will detect the deadlock:
rtnl_link_unregister() rtnl_newlink()
---- ----
lock(rtnl_mutex);
lock(&ops->srcu);
lock(rtnl_mutex);
sync(&ops->srcu);
To avoid the problem, we must call synchronize_srcu() before RTNL in
rtnl_link_unregister().
As a preparation, let's remove __rtnl_link_unregister().
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20241108004823.29419-2-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
230 lines
7.9 KiB
C
230 lines
7.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_RTNETLINK_H
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#define __NET_RTNETLINK_H
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#include <linux/rtnetlink.h>
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#include <linux/srcu.h>
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#include <net/netlink.h>
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typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *,
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struct netlink_ext_ack *);
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typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);
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enum rtnl_link_flags {
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RTNL_FLAG_DOIT_UNLOCKED = BIT(0),
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#define RTNL_FLAG_DOIT_PERNET RTNL_FLAG_DOIT_UNLOCKED
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RTNL_FLAG_BULK_DEL_SUPPORTED = BIT(1),
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RTNL_FLAG_DUMP_UNLOCKED = BIT(2),
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RTNL_FLAG_DUMP_SPLIT_NLM_DONE = BIT(3), /* legacy behavior */
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};
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enum rtnl_kinds {
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RTNL_KIND_NEW,
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RTNL_KIND_DEL,
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RTNL_KIND_GET,
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RTNL_KIND_SET
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};
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#define RTNL_KIND_MASK 0x3
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static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype)
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{
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return msgtype & RTNL_KIND_MASK;
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}
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/**
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* struct rtnl_msg_handler - rtnetlink message type and handlers
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*
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* @owner: NULL for built-in, THIS_MODULE for module
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* @protocol: Protocol family or PF_UNSPEC
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* @msgtype: rtnetlink message type
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* @doit: Function pointer called for each request message
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* @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
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* @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
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*/
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struct rtnl_msg_handler {
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struct module *owner;
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int protocol;
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int msgtype;
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rtnl_doit_func doit;
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rtnl_dumpit_func dumpit;
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int flags;
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};
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void rtnl_unregister_all(int protocol);
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int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n);
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void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n);
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#define rtnl_register_many(handlers) \
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__rtnl_register_many(handlers, ARRAY_SIZE(handlers))
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#define rtnl_unregister_many(handlers) \
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__rtnl_unregister_many(handlers, ARRAY_SIZE(handlers))
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static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
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{
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if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
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return ((struct rtgenmsg *) nlmsg_data(nlh))->rtgen_family;
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else
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return AF_UNSPEC;
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}
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/**
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* struct rtnl_link_ops - rtnetlink link operations
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*
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* @list: Used internally, protected by RTNL and SRCU
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* @srcu: Used internally
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* @kind: Identifier
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* @netns_refund: Physical device, move to init_net on netns exit
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* @maxtype: Highest device specific netlink attribute number
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* @policy: Netlink policy for device specific attribute validation
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* @validate: Optional validation function for netlink/changelink parameters
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* @alloc: netdev allocation function, can be %NULL and is then used
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* in place of alloc_netdev_mqs(), in this case @priv_size
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* and @setup are unused. Returns a netdev or ERR_PTR().
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* @priv_size: sizeof net_device private space
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* @setup: net_device setup function
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* @newlink: Function for configuring and registering a new device
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* @changelink: Function for changing parameters of an existing device
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* @dellink: Function to remove a device
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* @get_size: Function to calculate required room for dumping device
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* specific netlink attributes
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* @fill_info: Function to dump device specific netlink attributes
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* @get_xstats_size: Function to calculate required room for dumping device
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* specific statistics
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* @fill_xstats: Function to dump device specific statistics
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* @get_num_tx_queues: Function to determine number of transmit queues
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* to create when creating a new device.
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* @get_num_rx_queues: Function to determine number of receive queues
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* to create when creating a new device.
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* @get_link_net: Function to get the i/o netns of the device
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* @get_linkxstats_size: Function to calculate the required room for
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* dumping device-specific extended link stats
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* @fill_linkxstats: Function to dump device-specific extended link stats
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*/
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struct rtnl_link_ops {
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struct list_head list;
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struct srcu_struct srcu;
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const char *kind;
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size_t priv_size;
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struct net_device *(*alloc)(struct nlattr *tb[],
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const char *ifname,
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unsigned char name_assign_type,
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unsigned int num_tx_queues,
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unsigned int num_rx_queues);
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void (*setup)(struct net_device *dev);
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bool netns_refund;
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unsigned int maxtype;
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const struct nla_policy *policy;
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int (*validate)(struct nlattr *tb[],
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struct nlattr *data[],
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struct netlink_ext_ack *extack);
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int (*newlink)(struct net *src_net,
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struct net_device *dev,
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struct nlattr *tb[],
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struct nlattr *data[],
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struct netlink_ext_ack *extack);
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int (*changelink)(struct net_device *dev,
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struct nlattr *tb[],
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struct nlattr *data[],
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struct netlink_ext_ack *extack);
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void (*dellink)(struct net_device *dev,
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struct list_head *head);
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size_t (*get_size)(const struct net_device *dev);
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int (*fill_info)(struct sk_buff *skb,
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const struct net_device *dev);
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size_t (*get_xstats_size)(const struct net_device *dev);
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int (*fill_xstats)(struct sk_buff *skb,
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const struct net_device *dev);
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unsigned int (*get_num_tx_queues)(void);
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unsigned int (*get_num_rx_queues)(void);
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unsigned int slave_maxtype;
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const struct nla_policy *slave_policy;
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int (*slave_changelink)(struct net_device *dev,
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struct net_device *slave_dev,
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struct nlattr *tb[],
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struct nlattr *data[],
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struct netlink_ext_ack *extack);
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size_t (*get_slave_size)(const struct net_device *dev,
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const struct net_device *slave_dev);
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int (*fill_slave_info)(struct sk_buff *skb,
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const struct net_device *dev,
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const struct net_device *slave_dev);
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struct net *(*get_link_net)(const struct net_device *dev);
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size_t (*get_linkxstats_size)(const struct net_device *dev,
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int attr);
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int (*fill_linkxstats)(struct sk_buff *skb,
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const struct net_device *dev,
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int *prividx, int attr);
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};
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int __rtnl_link_register(struct rtnl_link_ops *ops);
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int rtnl_link_register(struct rtnl_link_ops *ops);
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void rtnl_link_unregister(struct rtnl_link_ops *ops);
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/**
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* struct rtnl_af_ops - rtnetlink address family operations
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*
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* @list: Used internally, protected by RTNL and SRCU
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* @srcu: Used internally
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* @family: Address family
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* @fill_link_af: Function to fill IFLA_AF_SPEC with address family
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* specific netlink attributes.
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* @get_link_af_size: Function to calculate size of address family specific
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* netlink attributes.
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* @validate_link_af: Validate a IFLA_AF_SPEC attribute, must check attr
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* for invalid configuration settings.
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* @set_link_af: Function to parse a IFLA_AF_SPEC attribute and modify
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* net_device accordingly.
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*/
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struct rtnl_af_ops {
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struct list_head list;
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struct srcu_struct srcu;
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int family;
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int (*fill_link_af)(struct sk_buff *skb,
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const struct net_device *dev,
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u32 ext_filter_mask);
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size_t (*get_link_af_size)(const struct net_device *dev,
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u32 ext_filter_mask);
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int (*validate_link_af)(const struct net_device *dev,
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const struct nlattr *attr,
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struct netlink_ext_ack *extack);
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int (*set_link_af)(struct net_device *dev,
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const struct nlattr *attr,
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struct netlink_ext_ack *extack);
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int (*fill_stats_af)(struct sk_buff *skb,
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const struct net_device *dev);
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size_t (*get_stats_af_size)(const struct net_device *dev);
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};
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int rtnl_af_register(struct rtnl_af_ops *ops);
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void rtnl_af_unregister(struct rtnl_af_ops *ops);
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struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
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struct net_device *rtnl_create_link(struct net *net, const char *ifname,
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unsigned char name_assign_type,
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const struct rtnl_link_ops *ops,
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struct nlattr *tb[],
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struct netlink_ext_ack *extack);
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int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh);
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int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
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u32 portid, const struct nlmsghdr *nlh);
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int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer,
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struct netlink_ext_ack *exterr);
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struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid);
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#define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
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#endif
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