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kernel/include/linux/inetdevice.h

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_INETDEVICE_H
#define _LINUX_INETDEVICE_H
#ifdef __KERNEL__
#include <linux/bitmap.h>
#include <linux/if.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/timer.h>
#include <linux/sysctl.h>
#include <linux/rtnetlink.h>
#include <linux/refcount.h>
struct ipv4_devconf {
void *sysctl;
int data[IPV4_DEVCONF_MAX];
DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
};
#define MC_HASH_SZ_LOG 9
struct in_device {
struct net_device *dev;
netdevice_tracker dev_tracker;
refcount_t refcnt;
int dead;
struct in_ifaddr __rcu *ifa_list;/* IP ifaddr chain */
struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */
struct ip_mc_list __rcu * __rcu *mc_hash;
int mc_count; /* Number of installed mcasts */
spinlock_t mc_tomb_lock;
struct ip_mc_list *mc_tomb;
unsigned long mr_v1_seen;
unsigned long mr_v2_seen;
unsigned long mr_maxdelay;
unsigned long mr_qi; /* Query Interval */
unsigned long mr_qri; /* Query Response Interval */
unsigned char mr_qrv; /* Query Robustness Variable */
unsigned char mr_gq_running;
u32 mr_ifc_count;
struct timer_list mr_gq_timer; /* general query timer */
struct timer_list mr_ifc_timer; /* interface change timer */
struct neigh_parms *arp_parms;
struct ipv4_devconf cnf;
struct rcu_head rcu_head;
};
#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
#define IPV4_DEVCONF_RO(cnf, attr) READ_ONCE(IPV4_DEVCONF(cnf, attr))
#define IPV4_DEVCONF_ALL(net, attr) \
IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
#define IPV4_DEVCONF_ALL_RO(net, attr) READ_ONCE(IPV4_DEVCONF_ALL(net, attr))
static inline int ipv4_devconf_get(const struct in_device *in_dev, int index)
{
index--;
return READ_ONCE(in_dev->cnf.data[index]);
}
static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
int val)
{
index--;
set_bit(index, in_dev->cnf.state);
WRITE_ONCE(in_dev->cnf.data[index], val);
}
static inline void ipv4_devconf_setall(struct in_device *in_dev)
{
bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
}
#define IN_DEV_CONF_GET(in_dev, attr) \
ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
#define IN_DEV_CONF_SET(in_dev, attr, val) \
ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
#define IN_DEV_ANDCONF(in_dev, attr) \
(IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), attr) && \
IN_DEV_CONF_GET((in_dev), attr))
#define IN_DEV_NET_ORCONF(in_dev, net, attr) \
(IPV4_DEVCONF_ALL_RO(net, attr) || \
IN_DEV_CONF_GET((in_dev), attr))
#define IN_DEV_ORCONF(in_dev, attr) \
IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
#define IN_DEV_MAXCONF(in_dev, attr) \
(max(IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), attr), \
IN_DEV_CONF_GET((in_dev), attr)))
#define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
#define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
#define IN_DEV_BFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), BC_FORWARDING)
#define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
#define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
#define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
ACCEPT_SOURCE_ROUTE)
#define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
#define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
#define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
#define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
#define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP_PVLAN)
#define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
#define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
#define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
SECURE_REDIRECTS)
#define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
#define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
IN_DEV_ORCONF((in_dev), \
PROMOTE_SECONDARIES)
#define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
#define IN_DEV_RX_REDIRECTS(in_dev) \
((IN_DEV_FORWARD(in_dev) && \
IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
|| (!IN_DEV_FORWARD(in_dev) && \
IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
#define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
IN_DEV_ORCONF((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
#define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
#define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ACCEPT)
#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
#define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
#define IN_DEV_ARP_EVICT_NOCARRIER(in_dev) IN_DEV_ANDCONF((in_dev), \
ARP_EVICT_NOCARRIER)
struct in_ifaddr {
struct hlist_node hash;
struct in_ifaddr __rcu *ifa_next;
struct in_device *ifa_dev;
struct rcu_head rcu_head;
__be32 ifa_local;
__be32 ifa_address;
__be32 ifa_mask;
__u32 ifa_rt_priority;
__be32 ifa_broadcast;
unsigned char ifa_scope;
unsigned char ifa_prefixlen;
unsigned char ifa_proto;
__u32 ifa_flags;
char ifa_label[IFNAMSIZ];
/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
__u32 ifa_valid_lft;
__u32 ifa_preferred_lft;
unsigned long ifa_cstamp; /* created timestamp */
unsigned long ifa_tstamp; /* updated timestamp */
};
struct in_validator_info {
__be32 ivi_addr;
struct in_device *ivi_dev;
struct netlink_ext_ack *extack;
};
int register_inetaddr_notifier(struct notifier_block *nb);
int unregister_inetaddr_notifier(struct notifier_block *nb);
int register_inetaddr_validator_notifier(struct notifier_block *nb);
int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
void inet_netconf_notify_devconf(struct net *net, int event, int type,
int ifindex, struct ipv4_devconf *devconf);
struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
{
return __ip_dev_find(net, addr, true);
}
int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
#ifdef CONFIG_INET
int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size);
#else
static inline int inet_gifconf(struct net_device *dev, char __user *buf,
int len, int size)
{
return 0;
}
#endif
void devinet_init(void);
struct in_device *inetdev_by_index(struct net *, int);
__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
__be32 local, int scope);
struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
__be32 mask);
struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
{
return !((addr^ifa->ifa_address)&ifa->ifa_mask);
}
/*
* Check if a mask is acceptable.
*/
static __inline__ bool bad_mask(__be32 mask, __be32 addr)
{
__u32 hmask;
if (addr & (mask = ~mask))
return true;
hmask = ntohl(mask);
if (hmask & (hmask+1))
return true;
return false;
}
#define in_dev_for_each_ifa_rtnl(ifa, in_dev) \
for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa; \
ifa = rtnl_dereference(ifa->ifa_next))
#define in_dev_for_each_ifa_rcu(ifa, in_dev) \
for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \
ifa = rcu_dereference(ifa->ifa_next))
static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
{
return rcu_dereference(dev->ip_ptr);
}
static inline struct in_device *in_dev_get(const struct net_device *dev)
{
struct in_device *in_dev;
rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (in_dev)
refcount_inc(&in_dev->refcnt);
rcu_read_unlock();
return in_dev;
}
static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
{
return rtnl_dereference(dev->ip_ptr);
}
/* called with rcu_read_lock or rtnl held */
static inline bool ip_ignore_linkdown(const struct net_device *dev)
{
struct in_device *in_dev;
bool rc = false;
in_dev = rcu_dereference_rtnl(dev->ip_ptr);
if (in_dev &&
IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
rc = true;
return rc;
}
static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
{
struct in_device *in_dev = __in_dev_get_rcu(dev);
return in_dev ? in_dev->arp_parms : NULL;
}
void in_dev_finish_destroy(struct in_device *idev);
static inline void in_dev_put(struct in_device *idev)
{
if (refcount_dec_and_test(&idev->refcnt))
in_dev_finish_destroy(idev);
}
#define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
#define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
#endif /* __KERNEL__ */
static __inline__ __be32 inet_make_mask(int logmask)
{
if (logmask)
return htonl(~((1U<<(32-logmask))-1));
return 0;
}
static __inline__ int inet_mask_len(__be32 mask)
{
__u32 hmask = ntohl(mask);
if (!hmask)
return 0;
return 32 - ffz(~hmask);
}
#endif /* _LINUX_INETDEVICE_H */
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