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ccf8dbcd06
In the quest to remove all stack VLA usage from the kernel[1], this allocates the maximum size expected for all possible types and adds sanity-checks at both registration and usage to make sure nothing gets out of sync. This matches the proposed VLA solution for nfnetlink[2]. The values chosen here were based on finding assignments for .maxtype and .slave_maxtype and manually counting the enums: slave_maxtype (max 33): IFLA_BRPORT_MAX 33 IFLA_BOND_SLAVE_MAX 9 maxtype (max 45): IFLA_BOND_MAX 28 IFLA_BR_MAX 45 __IFLA_CAIF_HSI_MAX 8 IFLA_CAIF_MAX 4 IFLA_CAN_MAX 16 IFLA_GENEVE_MAX 12 IFLA_GRE_MAX 25 IFLA_GTP_MAX 5 IFLA_HSR_MAX 7 IFLA_IPOIB_MAX 4 IFLA_IPTUN_MAX 21 IFLA_IPVLAN_MAX 3 IFLA_MACSEC_MAX 15 IFLA_MACVLAN_MAX 7 IFLA_PPP_MAX 2 __IFLA_RMNET_MAX 4 IFLA_VLAN_MAX 6 IFLA_VRF_MAX 2 IFLA_VTI_MAX 7 IFLA_VXLAN_MAX 28 VETH_INFO_MAX 2 VXCAN_INFO_MAX 2 This additionally changes maxtype and slave_maxtype fields to unsigned, since they're only ever using positive values. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com [2] https://patchwork.kernel.org/patch/10439647/ Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net>
172 lines
6.1 KiB
C
172 lines
6.1 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 <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 = 1,
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};
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void rtnl_register(int protocol, int msgtype,
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rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
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int rtnl_register_module(struct module *owner, int protocol, int msgtype,
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rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
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int rtnl_unregister(int protocol, int msgtype);
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void rtnl_unregister_all(int protocol);
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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
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* @kind: Identifier
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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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* @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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const char *kind;
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size_t priv_size;
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void (*setup)(struct net_device *dev);
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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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void __rtnl_link_unregister(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
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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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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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int (*set_link_af)(struct net_device *dev,
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const struct nlattr *attr);
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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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void 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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int rtnl_delete_link(struct net_device *dev);
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int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
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int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
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struct netlink_ext_ack *exterr);
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#define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
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#endif
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