VIDEOS 》 Linux Kernel net_device data-structure
Refer:
Wiki:
Linux namespaces - https://en.wikipedia.org/wiki/Linux_namespaces
Linux containers - https://en.wikipedia.org/wiki/Linux_containers
Docker - https://en.wikipedia.org/wiki/Docker_(software)
-----
Images:
Linux Containers Architecture - https://image.slidesharecdn.com/evoluationofli ...
Virtualization vs Containers - http://images.techhive.com/images/article/2016 ...
Docker Architecture - http://sphere3d.com/wp-content/uploads/2015/05 ...
-----
Linux Kernel Source:
struct net_device :: nd_net - Network namespace this network device is inside - http://elixir.free-electrons.com/linux/latest/ ...
possible_net_t - http://elixir.free-electrons.com/linux/latest/ ...
write_pnet(), read_pnet() APIs - http://elixir.free-electrons.com/linux/latest/ ...
Net namespace inlines APIs - http://elixir.free-electrons.com/linux/latest/ ...
Download this episode my entire kernel module sample code, make file, clean script HERE.
And here is the same source code for a quick reference.
/*---------- The Linux Channel -----------------*/ /* Author: Kiran Kankipati * Contact: [email protected] * Website: www.the-toffee-project.org * Date: 16-sep-2016 ----------------------------------------------*/ #include <linux/kernel.h> #include <linux/types.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/netfilter.h> #include <linux/netfilter_ipv4.h> #include <linux/skbuff.h> #include <linux/udp.h> #include <linux/ip.h> #include <linux/in.h> #include <linux/string.h> #include <linux/init.h> #include <linux/net.h> #include <linux/netdevice.h> #include <linux/socket.h> #include <linux/sockios.h> #include <linux/inet.h> #include <linux/inetdevice.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/if_arp.h> #include <linux/icmp.h> #include <linux/netlink.h> #include <linux/mroute.h> #include <net/checksum.h> #include <net/inet_ecn.h> #include <net/xfrm.h> #include <net/route.h> #include <net/sock.h> #include <net/ip.h> #include <net/tcp.h> #include <net/arp.h> #include <net/udp.h> #include <net/icmp.h> #include <net/inetpeer.h> #include <net/protocol.h> #include <net/flow.h> #include <asm/types.h> //REFER: http://lxr.free-electrons.com/source/include/linux/netdevice.h?v=3.13 static int mymodule_init(void) { struct net_device *dev = first_net_device(&init_net); while(dev) { printk("Dev: name: %s - ifindex: %d\n", dev->name, dev->ifindex); if(netif_running(dev)) { printk("Device is up\n"); } else { printk("Device is down\n"); } if(test_bit(__LINK_STATE_NOCARRIER, &dev->state)) { printk("NOCARRIER set\n"); } else { printk("NOCARRIER NOT-set\n"); } dev = next_net_device(dev); } return 0; } static void mymodule_exit(void) { } module_init(mymodule_init); module_exit(mymodule_exit);
Refer:
first_net_device() - http://lxr.free-electrons.com/source/include/l ...
netif_running() - http://lxr.free-electrons.com/source/include/l ...
Download this episode my entire kernel module sample code, make file, clean script HERE.
And here is the same source code for a quick reference.
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/icmp.h>
#include <linux/netlink.h>
#include <linux/mroute.h>
#include <net/checksum.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/tcp.h>
#include <net/arp.h>
#include <net/udp.h>
#include <net/icmp.h>
#include <net/inetpeer.h>
#include <net/protocol.h>
#include <net/flow.h>
#include <asm/types.h>
static int mymodule_init(void)
{
struct net_device *dev = first_net_device(&init_net);
while(dev)
{ printk("Dev: name: %s - ifindex: %d\n", dev->name, dev->ifindex);
dev = next_net_device(dev);
}
return 0;
}
static void mymodule_exit(void)
{
}
module_init(mymodule_init);
module_exit(mymodule_exit);
Refer:
first_net_device() - http://lxr.free-electrons.com/source/include/l ...
next_net_device() - http://lxr.free-electrons.com/source/include/l ...
Download this episode my entire kernel module sample code, make file, clean script HERE.
And here is the same source code for a quick reference.
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/icmp.h>
#include <linux/netlink.h>
#include <linux/mroute.h>
#include <net/checksum.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/tcp.h>
#include <net/arp.h>
#include <net/udp.h>
#include <net/icmp.h>
#include <net/inetpeer.h>
#include <net/protocol.h>
#include <net/flow.h>
#include <asm/types.h>
static int mymodule_init(void)
{
struct net_device *dev=dev_get_by_index(&init_net, 1);
if(dev!=NULL)
{ printk("Dev: name: %s - ifindex: %d\n", dev->name, dev->ifindex); }
return 0;
}
static void mymodule_exit(void)
{
}
module_init(mymodule_init);
module_exit(mymodule_exit);
Refer:
dev_get_by_index() prototype - http://lxr.free-electrons.com/source/include/l ...
dev_get_by_index() implementation - http://lxr.free-electrons.com/source/net/core/ ...
Download this episode my entire kernel module sample code, make file, clean script HERE.
And here is the same source code for a quick reference.
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/icmp.h>
#include <linux/netlink.h>
#include <linux/mroute.h>
#include <net/checksum.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/tcp.h>
#include <net/arp.h>
#include <net/udp.h>
#include <net/icmp.h>
#include <net/inetpeer.h>
#include <net/protocol.h>
#include <net/flow.h>
#include <asm/types.h>
static int mymodule_init(void)
{
struct net_device *dev=dev_get_by_name(&init_net, "eno1");
if(dev!=NULL)
{ printk("Dev: name: %s - ifindex: %d\n", dev->name, dev->ifindex); }
return 0;
}
static void mymodule_exit(void)
{
}
module_init(mymodule_init);
module_exit(mymodule_exit);
Refer:
dev_get_by_name() prototype - http://lxr.free-electrons.com/source/net/core/ ...
dev_get_by_name() implementation - http://lxr.free-electrons.com/source/include/l ...
Refer:
struct net_device - http://lxr.free-electrons.com/source/include/l ...
And here is the copy paste of struct net_device (include/linux/netdevice.h) from the Kernel-source version 4.11 for quick reference:
/**
* struct net_device - The DEVICE structure.
* Actually, this whole structure is a big mistake. It mixes I/O
* data with strictly "high-level" data, and it has to know about
* almost every data structure used in the INET module.
*
* @name: This is the first field of the "visible" part of this structure
* (i.e. as seen by users in the "Space.c" file). It is the name
* of the interface.
*
* @name_hlist: Device name hash chain, please keep it close to name[]
* @ifalias: SNMP alias
* @mem_end: Shared memory end
* @mem_start: Shared memory start
* @base_addr: Device I/O address
* @irq: Device IRQ number
*
* @carrier_changes: Stats to monitor carrier on<->off transitions
*
* @state: Generic network queuing layer state, see netdev_state_t
* @dev_list: The global list of network devices
* @napi_list: List entry used for polling NAPI devices
* @unreg_list: List entry when we are unregistering the
* device; see the function unregister_netdev
* @close_list: List entry used when we are closing the device
* @ptype_all: Device-specific packet handlers for all protocols
* @ptype_specific: Device-specific, protocol-specific packet handlers
*
* @adj_list: Directly linked devices, like slaves for bonding
* @features: Currently active device features
* @hw_features: User-changeable features
*
* @wanted_features: User-requested features
* @vlan_features: Mask of features inheritable by VLAN devices
*
* @hw_enc_features: Mask of features inherited by encapsulating devices
* This field indicates what encapsulation
* offloads the hardware is capable of doing,
* and drivers will need to set them appropriately.
*
* @mpls_features: Mask of features inheritable by MPLS
*
* @ifindex: interface index
* @group: The group the device belongs to
*
* @stats: Statistics struct, which was left as a legacy, use
* rtnl_link_stats64 instead
*
* @rx_dropped: Dropped packets by core network,
* do not use this in drivers
* @tx_dropped: Dropped packets by core network,
* do not use this in drivers
* @rx_nohandler: nohandler dropped packets by core network on
* inactive devices, do not use this in drivers
*
* @wireless_handlers: List of functions to handle Wireless Extensions,
* instead of ioctl,
* see <net/iw_handler.h> for details.
* @wireless_data: Instance data managed by the core of wireless extensions
*
* @netdev_ops: Includes several pointers to callbacks,
* if one wants to override the ndo_*() functions
* @ethtool_ops: Management operations
* @ndisc_ops: Includes callbacks for different IPv6 neighbour
* discovery handling. Necessary for e.g. 6LoWPAN.
* @header_ops: Includes callbacks for creating,parsing,caching,etc
* of Layer 2 headers.
*
* @flags: Interface flags (a la BSD)
* @priv_flags: Like 'flags' but invisible to userspace,
* see if.h for the definitions
* @gflags: Global flags ( kept as legacy )
* @padded: How much padding added by alloc_netdev()
* @operstate: RFC2863 operstate
* @link_mode: Mapping policy to operstate
* @if_port: Selectable AUI, TP, ...
* @dma: DMA channel
* @mtu: Interface MTU value
* @min_mtu: Interface Minimum MTU value
* @max_mtu: Interface Maximum MTU value
* @type: Interface hardware type
* @hard_header_len: Maximum hardware header length.
* @min_header_len: Minimum hardware header length
*
* @needed_headroom: Extra headroom the hardware may need, but not in all
* cases can this be guaranteed
* @needed_tailroom: Extra tailroom the hardware may need, but not in all
* cases can this be guaranteed. Some cases also use
* LL_MAX_HEADER instead to allocate the skb
*
* interface address info:
*
* @perm_addr: Permanent hw address
* @addr_assign_type: Hw address assignment type
* @addr_len: Hardware address length
* @neigh_priv_len: Used in neigh_alloc()
* @dev_id: Used to differentiate devices that share
* the same link layer address
* @dev_port: Used to differentiate devices that share
* the same function
* @addr_list_lock: XXX: need comments on this one
* @uc_promisc: Counter that indicates promiscuous mode
* has been enabled due to the need to listen to
* additional unicast addresses in a device that
* does not implement ndo_set_rx_mode()
* @uc: unicast mac addresses
* @mc: multicast mac addresses
* @dev_addrs: list of device hw addresses
* @queues_kset: Group of all Kobjects in the Tx and RX queues
* @promiscuity: Number of times the NIC is told to work in
* promiscuous mode; if it becomes 0 the NIC will
* exit promiscuous mode
* @allmulti: Counter, enables or disables allmulticast mode
*
* @vlan_info: VLAN info
* @dsa_ptr: dsa specific data
* @tipc_ptr: TIPC specific data
* @atalk_ptr: AppleTalk link
* @ip_ptr: IPv4 specific data
* @dn_ptr: DECnet specific data
* @ip6_ptr: IPv6 specific data
* @ax25_ptr: AX.25 specific data
* @ieee80211_ptr: IEEE 802.11 specific data, assign before registering
*
* @dev_addr: Hw address (before bcast,
* because most packets are unicast)
*
* @_rx: Array of RX queues
* @num_rx_queues: Number of RX queues
* allocated at register_netdev() time
* @real_num_rx_queues: Number of RX queues currently active in device
*
* @rx_handler: handler for received packets
* @rx_handler_data: XXX: need comments on this one
* @ingress_queue: XXX: need comments on this one
* @broadcast: hw bcast address
*
* @rx_cpu_rmap: CPU reverse-mapping for RX completion interrupts,
* indexed by RX queue number. Assigned by driver.
* This must only be set if the ndo_rx_flow_steer
* operation is defined
* @index_hlist: Device index hash chain
*
* @_tx: Array of TX queues
* @num_tx_queues: Number of TX queues allocated at alloc_netdev_mq() time
* @real_num_tx_queues: Number of TX queues currently active in device
* @qdisc: Root qdisc from userspace point of view
* @tx_queue_len: Max frames per queue allowed
* @tx_global_lock: XXX: need comments on this one
*
* @xps_maps: XXX: need comments on this one
*
* @watchdog_timeo: Represents the timeout that is used by
* the watchdog (see dev_watchdog())
* @watchdog_timer: List of timers
*
* @pcpu_refcnt: Number of references to this device
* @todo_list: Delayed register/unregister
* @link_watch_list: XXX: need comments on this one
*
* @reg_state: Register/unregister state machine
* @dismantle: Device is going to be freed
* @rtnl_link_state: This enum represents the phases of creating
* a new link
*
* @destructor: Called from unregister,
* can be used to call free_netdev
* @npinfo: XXX: need comments on this one
* @nd_net: Network namespace this network device is inside
*
* @ml_priv: Mid-layer private
* @lstats: Loopback statistics
* @tstats: Tunnel statistics
* @dstats: Dummy statistics
* @vstats: Virtual ethernet statistics
*
* @garp_port: GARP
* @mrp_port: MRP
*
* @dev: Class/net/name entry
* @sysfs_groups: Space for optional device, statistics and wireless
* sysfs groups
*
* @sysfs_rx_queue_group: Space for optional per-rx queue attributes
* @rtnl_link_ops: Rtnl_link_ops
*
* @gso_max_size: Maximum size of generic segmentation offload
* @gso_max_segs: Maximum number of segments that can be passed to the
* NIC for GSO
*
* @dcbnl_ops: Data Center Bridging netlink ops
* @num_tc: Number of traffic classes in the net device
* @tc_to_txq: XXX: need comments on this one
* @prio_tc_map: XXX: need comments on this one
*
* @fcoe_ddp_xid: Max exchange id for FCoE LRO by ddp
*
* @priomap: XXX: need comments on this one
* @phydev: Physical device may attach itself
* for hardware timestamping
*
* @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
* @qdisc_running_key: lockdep class annotating Qdisc->running seqcount
*
* @proto_down: protocol port state information can be sent to the
* switch driver and used to set the phys state of the
* switch port.
*
* FIXME: cleanup struct net_device such that network protocol info
* moves out.
*/
struct net_device {
char name[IFNAMSIZ];
struct hlist_node name_hlist;
char *ifalias;
/*
* I/O specific fields
* FIXME: Merge these and struct ifmap into one
*/
unsigned long mem_end;
unsigned long mem_start;
unsigned long base_addr;
int irq;
atomic_t carrier_changes;
/*
* Some hardware also needs these fields (state,dev_list,
* napi_list,unreg_list,close_list) but they are not
* part of the usual set specified in Space.c.
*/
unsigned long state;
struct list_head dev_list;
struct list_head napi_list;
struct list_head unreg_list;
struct list_head close_list;
struct list_head ptype_all;
struct list_head ptype_specific;
struct {
struct list_head upper;
struct list_head lower;
} adj_list;
netdev_features_t features;
netdev_features_t hw_features;
netdev_features_t wanted_features;
netdev_features_t vlan_features;
netdev_features_t hw_enc_features;
netdev_features_t mpls_features;
netdev_features_t gso_partial_features;
int ifindex;
int group;
struct net_device_stats stats;
atomic_long_t rx_dropped;
atomic_long_t tx_dropped;
atomic_long_t rx_nohandler;
#ifdef CONFIG_WIRELESS_EXT
const struct iw_handler_def *wireless_handlers;
struct iw_public_data *wireless_data;
#endif
const struct net_device_ops *netdev_ops;
const struct ethtool_ops *ethtool_ops;
#ifdef CONFIG_NET_SWITCHDEV
const struct switchdev_ops *switchdev_ops;
#endif
#ifdef CONFIG_NET_L3_MASTER_DEV
const struct l3mdev_ops *l3mdev_ops;
#endif
#if IS_ENABLED(CONFIG_IPV6)
const struct ndisc_ops *ndisc_ops;
#endif
const struct header_ops *header_ops;
unsigned int flags;
unsigned int priv_flags;
unsigned short gflags;
unsigned short padded;
unsigned char operstate;
unsigned char link_mode;
unsigned char if_port;
unsigned char dma;
unsigned int mtu;
unsigned int min_mtu;
unsigned int max_mtu;
unsigned short type;
unsigned short hard_header_len;
unsigned short min_header_len;
unsigned short needed_headroom;
unsigned short needed_tailroom;
/* Interface address info. */
unsigned char perm_addr[MAX_ADDR_LEN];
unsigned char addr_assign_type;
unsigned char addr_len;
unsigned short neigh_priv_len;
unsigned short dev_id;
unsigned short dev_port;
spinlock_t addr_list_lock;
unsigned char name_assign_type;
bool uc_promisc;
struct netdev_hw_addr_list uc;
struct netdev_hw_addr_list mc;
struct netdev_hw_addr_list dev_addrs;
#ifdef CONFIG_SYSFS
struct kset *queues_kset;
#endif
unsigned int promiscuity;
unsigned int allmulti;
/* Protocol-specific pointers */
#if IS_ENABLED(CONFIG_VLAN_8021Q)
struct vlan_info __rcu *vlan_info;
#endif
#if IS_ENABLED(CONFIG_NET_DSA)
struct dsa_switch_tree *dsa_ptr;
#endif
#if IS_ENABLED(CONFIG_TIPC)
struct tipc_bearer __rcu *tipc_ptr;
#endif
void *atalk_ptr;
struct in_device __rcu *ip_ptr;
struct dn_dev __rcu *dn_ptr;
struct inet6_dev __rcu *ip6_ptr;
void *ax25_ptr;
struct wireless_dev *ieee80211_ptr;
struct wpan_dev *ieee802154_ptr;
#if IS_ENABLED(CONFIG_MPLS_ROUTING)
struct mpls_dev __rcu *mpls_ptr;
#endif
/*
* Cache lines mostly used on receive path (including eth_type_trans())
*/
/* Interface address info used in eth_type_trans() */
unsigned char *dev_addr;
#ifdef CONFIG_SYSFS
struct netdev_rx_queue *_rx;
unsigned int num_rx_queues;
unsigned int real_num_rx_queues;
#endif
unsigned long gro_flush_timeout;
rx_handler_func_t __rcu *rx_handler;
void __rcu *rx_handler_data;
#ifdef CONFIG_NET_CLS_ACT
struct tcf_proto __rcu *ingress_cl_list;
#endif
struct netdev_queue __rcu *ingress_queue;
#ifdef CONFIG_NETFILTER_INGRESS
struct nf_hook_entry __rcu *nf_hooks_ingress;
#endif
unsigned char broadcast[MAX_ADDR_LEN];
#ifdef CONFIG_RFS_ACCEL
struct cpu_rmap *rx_cpu_rmap;
#endif
struct hlist_node index_hlist;
/*
* Cache lines mostly used on transmit path
*/
struct netdev_queue *_tx ____cacheline_aligned_in_smp;
unsigned int num_tx_queues;
unsigned int real_num_tx_queues;
struct Qdisc *qdisc;
#ifdef CONFIG_NET_SCHED
DECLARE_HASHTABLE (qdisc_hash, 4);
#endif
unsigned long tx_queue_len;
spinlock_t tx_global_lock;
int watchdog_timeo;
#ifdef CONFIG_XPS
struct xps_dev_maps __rcu *xps_maps;
#endif
#ifdef CONFIG_NET_CLS_ACT
struct tcf_proto __rcu *egress_cl_list;
#endif
/* These may be needed for future network-power-down code. */
struct timer_list watchdog_timer;
int __percpu *pcpu_refcnt;
struct list_head todo_list;
struct list_head link_watch_list;
enum { NETREG_UNINITIALIZED=0,
NETREG_REGISTERED, /* completed register_netdevice */
NETREG_UNREGISTERING, /* called unregister_netdevice */
NETREG_UNREGISTERED, /* completed unregister todo */
NETREG_RELEASED, /* called free_netdev */
NETREG_DUMMY, /* dummy device for NAPI poll */
} reg_state:8;
bool dismantle;
enum {
RTNL_LINK_INITIALIZED,
RTNL_LINK_INITIALIZING,
} rtnl_link_state:16;
void (*destructor)(struct net_device *dev);
#ifdef CONFIG_NETPOLL
struct netpoll_info __rcu *npinfo;
#endif
possible_net_t nd_net;
/* mid-layer private */
union {
void *ml_priv;
struct pcpu_lstats __percpu *lstats;
struct pcpu_sw_netstats __percpu *tstats;
struct pcpu_dstats __percpu *dstats;
struct pcpu_vstats __percpu *vstats;
};
#if IS_ENABLED(CONFIG_GARP)
struct garp_port __rcu *garp_port;
#endif
#if IS_ENABLED(CONFIG_MRP)
struct mrp_port __rcu *mrp_port;
#endif
struct device dev;
const struct attribute_group *sysfs_groups[4];
const struct attribute_group *sysfs_rx_queue_group;
const struct rtnl_link_ops *rtnl_link_ops;
/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE 65536
unsigned int gso_max_size;
#define GSO_MAX_SEGS 65535
u16 gso_max_segs;
#ifdef CONFIG_DCB
const struct dcbnl_rtnl_ops *dcbnl_ops;
#endif
u8 num_tc;
struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
u8 prio_tc_map[TC_BITMASK + 1];
#if IS_ENABLED(CONFIG_FCOE)
unsigned int fcoe_ddp_xid;
#endif
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
struct netprio_map __rcu *priomap;
#endif
struct phy_device *phydev;
struct lock_class_key *qdisc_tx_busylock;
struct lock_class_key *qdisc_running_key;
bool proto_down;
};
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