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Diffstat (limited to 'include/net/rtnetlink.h')
-rw-r--r--include/net/rtnetlink.h135
1 files changed, 112 insertions, 23 deletions
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index e2091bb2b3a8..ec65a8cebb99 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -3,6 +3,7 @@
#define __NET_RTNETLINK_H
#include <linux/rtnetlink.h>
+#include <linux/srcu.h>
#include <net/netlink.h>
typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *,
@@ -10,16 +11,56 @@ typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *,
typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);
enum rtnl_link_flags {
- RTNL_FLAG_DOIT_UNLOCKED = 1,
+ RTNL_FLAG_DOIT_UNLOCKED = BIT(0),
+#define RTNL_FLAG_DOIT_PERNET RTNL_FLAG_DOIT_UNLOCKED
+#define RTNL_FLAG_DOIT_PERNET_WIP RTNL_FLAG_DOIT_UNLOCKED
+ RTNL_FLAG_BULK_DEL_SUPPORTED = BIT(1),
+ RTNL_FLAG_DUMP_UNLOCKED = BIT(2),
+ RTNL_FLAG_DUMP_SPLIT_NLM_DONE = BIT(3), /* legacy behavior */
+};
+
+enum rtnl_kinds {
+ RTNL_KIND_NEW,
+ RTNL_KIND_DEL,
+ RTNL_KIND_GET,
+ RTNL_KIND_SET
+};
+#define RTNL_KIND_MASK 0x3
+
+static inline enum rtnl_kinds rtnl_msgtype_kind(int msgtype)
+{
+ return msgtype & RTNL_KIND_MASK;
+}
+
+/**
+ * struct rtnl_msg_handler - rtnetlink message type and handlers
+ *
+ * @owner: NULL for built-in, THIS_MODULE for module
+ * @protocol: Protocol family or PF_UNSPEC
+ * @msgtype: rtnetlink message type
+ * @doit: Function pointer called for each request message
+ * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
+ * @flags: rtnl_link_flags to modify behaviour of doit/dumpit functions
+ */
+struct rtnl_msg_handler {
+ struct module *owner;
+ int protocol;
+ int msgtype;
+ rtnl_doit_func doit;
+ rtnl_dumpit_func dumpit;
+ int flags;
};
-void rtnl_register(int protocol, int msgtype,
- rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
-int rtnl_register_module(struct module *owner, int protocol, int msgtype,
- rtnl_doit_func, rtnl_dumpit_func, unsigned int flags);
-int rtnl_unregister(int protocol, int msgtype);
void rtnl_unregister_all(int protocol);
+int __rtnl_register_many(const struct rtnl_msg_handler *handlers, int n);
+void __rtnl_unregister_many(const struct rtnl_msg_handler *handlers, int n);
+
+#define rtnl_register_many(handlers) \
+ __rtnl_register_many(handlers, ARRAY_SIZE(handlers))
+#define rtnl_unregister_many(handlers) \
+ __rtnl_unregister_many(handlers, ARRAY_SIZE(handlers))
+
static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
{
if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
@@ -29,13 +70,53 @@ static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
}
/**
+ * struct rtnl_newlink_params - parameters of rtnl_link_ops::newlink()
+ *
+ * @src_net: Source netns of rtnetlink socket
+ * @link_net: Link netns by IFLA_LINK_NETNSID, NULL if not specified
+ * @peer_net: Peer netns
+ * @tb: IFLA_* attributes
+ * @data: IFLA_INFO_DATA attributes
+ */
+struct rtnl_newlink_params {
+ struct net *src_net;
+ struct net *link_net;
+ struct net *peer_net;
+ struct nlattr **tb;
+ struct nlattr **data;
+};
+
+/* Get effective link netns from newlink params. Generally, this is link_net
+ * and falls back to src_net. But for compatibility, a driver may * choose to
+ * use dev_net(dev) instead.
+ */
+static inline struct net *rtnl_newlink_link_net(struct rtnl_newlink_params *p)
+{
+ return p->link_net ? : p->src_net;
+}
+
+/* Get peer netns from newlink params. Fallback to link netns if peer netns is
+ * not specified explicitly.
+ */
+static inline struct net *rtnl_newlink_peer_net(struct rtnl_newlink_params *p)
+{
+ return p->peer_net ? : rtnl_newlink_link_net(p);
+}
+
+/**
* struct rtnl_link_ops - rtnetlink link operations
*
- * @list: Used internally
+ * @list: Used internally, protected by link_ops_mutex and SRCU
+ * @srcu: Used internally
* @kind: Identifier
+ * @netns_refund: Physical device, move to init_net on netns exit
+ * @peer_type: Peer device specific netlink attribute number (e.g. VETH_INFO_PEER)
* @maxtype: Highest device specific netlink attribute number
* @policy: Netlink policy for device specific attribute validation
* @validate: Optional validation function for netlink/changelink parameters
+ * @alloc: netdev allocation function, can be %NULL and is then used
+ * in place of alloc_netdev_mqs(), in this case @priv_size
+ * and @setup are unused. Returns a netdev or ERR_PTR().
* @priv_size: sizeof net_device private space
* @setup: net_device setup function
* @newlink: Function for configuring and registering a new device
@@ -58,22 +139,28 @@ static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
*/
struct rtnl_link_ops {
struct list_head list;
+ struct srcu_struct srcu;
const char *kind;
size_t priv_size;
+ struct net_device *(*alloc)(struct nlattr *tb[],
+ const char *ifname,
+ unsigned char name_assign_type,
+ unsigned int num_tx_queues,
+ unsigned int num_rx_queues);
void (*setup)(struct net_device *dev);
+ bool netns_refund;
+ const u16 peer_type;
unsigned int maxtype;
const struct nla_policy *policy;
int (*validate)(struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack);
- int (*newlink)(struct net *src_net,
- struct net_device *dev,
- struct nlattr *tb[],
- struct nlattr *data[],
+ int (*newlink)(struct net_device *dev,
+ struct rtnl_newlink_params *params,
struct netlink_ext_ack *extack);
int (*changelink)(struct net_device *dev,
struct nlattr *tb[],
@@ -112,16 +199,14 @@ struct rtnl_link_ops {
int *prividx, int attr);
};
-int __rtnl_link_register(struct rtnl_link_ops *ops);
-void __rtnl_link_unregister(struct rtnl_link_ops *ops);
-
int rtnl_link_register(struct rtnl_link_ops *ops);
void rtnl_link_unregister(struct rtnl_link_ops *ops);
/**
* struct rtnl_af_ops - rtnetlink address family operations
*
- * @list: Used internally
+ * @list: Used internally, protected by RTNL and SRCU
+ * @srcu: Used internally
* @family: Address family
* @fill_link_af: Function to fill IFLA_AF_SPEC with address family
* specific netlink attributes.
@@ -134,6 +219,8 @@ void rtnl_link_unregister(struct rtnl_link_ops *ops);
*/
struct rtnl_af_ops {
struct list_head list;
+ struct srcu_struct srcu;
+
int family;
int (*fill_link_af)(struct sk_buff *skb,
@@ -143,16 +230,17 @@ struct rtnl_af_ops {
u32 ext_filter_mask);
int (*validate_link_af)(const struct net_device *dev,
- const struct nlattr *attr);
+ const struct nlattr *attr,
+ struct netlink_ext_ack *extack);
int (*set_link_af)(struct net_device *dev,
- const struct nlattr *attr);
-
+ const struct nlattr *attr,
+ struct netlink_ext_ack *extack);
int (*fill_stats_af)(struct sk_buff *skb,
const struct net_device *dev);
size_t (*get_stats_af_size)(const struct net_device *dev);
};
-void rtnl_af_register(struct rtnl_af_ops *ops);
+int rtnl_af_register(struct rtnl_af_ops *ops);
void rtnl_af_unregister(struct rtnl_af_ops *ops);
struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[]);
@@ -161,11 +249,12 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
const struct rtnl_link_ops *ops,
struct nlattr *tb[],
struct netlink_ext_ack *extack);
-int rtnl_delete_link(struct net_device *dev);
-int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm);
+int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh);
+int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
+ u32 portid, const struct nlmsghdr *nlh);
-int rtnl_nla_parse_ifla(struct nlattr **tb, const struct nlattr *head, int len,
- struct netlink_ext_ack *exterr);
+int rtnl_nla_parse_ifinfomsg(struct nlattr **tb, const struct nlattr *nla_peer,
+ struct netlink_ext_ack *exterr);
struct net *rtnl_get_net_ns_capable(struct sock *sk, int netnsid);
#define MODULE_ALIAS_RTNL_LINK(kind) MODULE_ALIAS("rtnl-link-" kind)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.