1#ifndef _LINUX_INETDEVICE_H
2#define _LINUX_INETDEVICE_H
3
4#ifdef __KERNEL__
5
6struct ipv4_devconf
7{
8	int	accept_redirects;
9	int	send_redirects;
10	int	secure_redirects;
11	int	shared_media;
12	int	accept_source_route;
13	int	rp_filter;
14	int	proxy_arp;
15	int	bootp_relay;
16	int	log_martians;
17	int	forwarding;
18	int	mc_forwarding;
19	int	tag;
20	int     arp_filter;
21	int	medium_id;
22	void	*sysctl;
23};
24
25extern struct ipv4_devconf ipv4_devconf;
26
27struct in_device
28{
29	struct net_device		*dev;
30	atomic_t		refcnt;
31	rwlock_t		lock;
32	int			dead;
33	struct in_ifaddr	*ifa_list;	/* IP ifaddr chain		*/
34	struct ip_mc_list	*mc_list;	/* IP multicast filter chain    */
35	unsigned long		mr_v1_seen;
36	struct neigh_parms	*arp_parms;
37	struct ipv4_devconf	cnf;
38};
39
40#define IN_DEV_FORWARD(in_dev)		((in_dev)->cnf.forwarding)
41#define IN_DEV_MFORWARD(in_dev)		(ipv4_devconf.mc_forwarding && (in_dev)->cnf.mc_forwarding)
42#define IN_DEV_RPFILTER(in_dev)		(ipv4_devconf.rp_filter && (in_dev)->cnf.rp_filter)
43#define IN_DEV_SOURCE_ROUTE(in_dev)	(ipv4_devconf.accept_source_route && (in_dev)->cnf.accept_source_route)
44#define IN_DEV_BOOTP_RELAY(in_dev)	(ipv4_devconf.bootp_relay && (in_dev)->cnf.bootp_relay)
45
46#define IN_DEV_LOG_MARTIANS(in_dev)	(ipv4_devconf.log_martians || (in_dev)->cnf.log_martians)
47#define IN_DEV_PROXY_ARP(in_dev)	(ipv4_devconf.proxy_arp || (in_dev)->cnf.proxy_arp)
48#define IN_DEV_SHARED_MEDIA(in_dev)	(ipv4_devconf.shared_media || (in_dev)->cnf.shared_media)
49#define IN_DEV_TX_REDIRECTS(in_dev)	(ipv4_devconf.send_redirects || (in_dev)->cnf.send_redirects)
50#define IN_DEV_SEC_REDIRECTS(in_dev)	(ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
51#define IN_DEV_IDTAG(in_dev)		((in_dev)->cnf.tag)
52#define IN_DEV_MEDIUM_ID(in_dev)	((in_dev)->cnf.medium_id)
53
54#define IN_DEV_RX_REDIRECTS(in_dev) \
55	((IN_DEV_FORWARD(in_dev) && \
56	  (ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
57	 || (!IN_DEV_FORWARD(in_dev) && \
58	  (ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))
59
60#define IN_DEV_ARPFILTER(in_dev)	(ipv4_devconf.arp_filter || (in_dev)->cnf.arp_filter)
61
62struct in_ifaddr
63{
64	struct in_ifaddr	*ifa_next;
65	struct in_device	*ifa_dev;
66	u32			ifa_local;
67	u32			ifa_address;
68	u32			ifa_mask;
69	u32			ifa_broadcast;
70	u32			ifa_anycast;
71	unsigned char		ifa_scope;
72	unsigned char		ifa_flags;
73	unsigned char		ifa_prefixlen;
74	char			ifa_label[IFNAMSIZ];
75};
76
77extern int register_inetaddr_notifier(struct notifier_block *nb);
78extern int unregister_inetaddr_notifier(struct notifier_block *nb);
79
80extern struct net_device 	*ip_dev_find(u32 addr);
81extern int		inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b);
82extern int		devinet_ioctl(unsigned int cmd, void *);
83extern void		devinet_init(void);
84extern struct in_device *inetdev_init(struct net_device *dev);
85extern struct in_device	*inetdev_by_index(int);
86extern u32		inet_select_addr(const struct net_device *dev, u32 dst, int scope);
87extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask);
88extern void		inet_forward_change(void);
89
90static __inline__ int inet_ifa_match(u32 addr, struct in_ifaddr *ifa)
91{
92	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
93}
94
95/*
96 *	Check if a mask is acceptable.
97 */
98
99static __inline__ int bad_mask(u32 mask, u32 addr)
100{
101	if (addr & (mask = ~mask))
102		return 1;
103	mask = ntohl(mask);
104	if (mask & (mask+1))
105		return 1;
106	return 0;
107}
108
109#define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \
110  for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
111
112#define for_ifa(in_dev)	{ struct in_ifaddr *ifa; \
113  for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
114
115
116#define endfor_ifa(in_dev) }
117
118extern rwlock_t inetdev_lock;
119
120
121static __inline__ struct in_device *
122in_dev_get(const struct net_device *dev)
123{
124	struct in_device *in_dev;
125
126	read_lock(&inetdev_lock);
127	in_dev = dev->ip_ptr;
128	if (in_dev)
129		atomic_inc(&in_dev->refcnt);
130	read_unlock(&inetdev_lock);
131	return in_dev;
132}
133
134static __inline__ struct in_device *
135__in_dev_get(const struct net_device *dev)
136{
137	return (struct in_device*)dev->ip_ptr;
138}
139
140extern void in_dev_finish_destroy(struct in_device *idev);
141
142static __inline__ void
143in_dev_put(struct in_device *idev)
144{
145	if (atomic_dec_and_test(&idev->refcnt))
146		in_dev_finish_destroy(idev);
147}
148
149#define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
150#define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
151
152#endif /* __KERNEL__ */
153
154static __inline__ __u32 inet_make_mask(int logmask)
155{
156	if (logmask)
157		return htonl(~((1<<(32-logmask))-1));
158	return 0;
159}
160
161static __inline__ int inet_mask_len(__u32 mask)
162{
163	if (!(mask = ntohl(mask)))
164		return 0;
165	return 32 - ffz(~mask);
166}
167
168
169#endif /* _LINUX_INETDEVICE_H */
170