31910575a9
As discussed before, this patch provides userland with a way to access relevant options in Router Advertisements, after they are processed and validated by the kernel. Extra options are processed in a generic way; this patch only exports RDNSS options described in RFC5006, but support to control which options are exported could be easily added. A new rtnetlink message type is defined, to transport Neighbor Discovery options, along with optional context information. At the moment only the address of the router sending an RDNSS option is included, but additional attributes may be later defined, if needed by new use cases. Signed-off-by: Pierre Ynard <linkfanel@yahoo.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
146 lines
3 KiB
C
146 lines
3 KiB
C
#ifndef _NDISC_H
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#define _NDISC_H
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/*
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* ICMP codes for neighbour discovery messages
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*/
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#define NDISC_ROUTER_SOLICITATION 133
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#define NDISC_ROUTER_ADVERTISEMENT 134
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#define NDISC_NEIGHBOUR_SOLICITATION 135
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#define NDISC_NEIGHBOUR_ADVERTISEMENT 136
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#define NDISC_REDIRECT 137
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/*
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* ndisc options
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*/
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enum {
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__ND_OPT_PREFIX_INFO_END = 0,
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ND_OPT_SOURCE_LL_ADDR = 1, /* RFC2461 */
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ND_OPT_TARGET_LL_ADDR = 2, /* RFC2461 */
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ND_OPT_PREFIX_INFO = 3, /* RFC2461 */
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ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */
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ND_OPT_MTU = 5, /* RFC2461 */
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__ND_OPT_ARRAY_MAX,
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ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
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ND_OPT_RDNSS = 25, /* RFC5006 */
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__ND_OPT_MAX
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};
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#define MAX_RTR_SOLICITATION_DELAY HZ
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#define ND_REACHABLE_TIME (30*HZ)
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#define ND_RETRANS_TIMER HZ
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#define ND_MIN_RANDOM_FACTOR (1/2)
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#define ND_MAX_RANDOM_FACTOR (3/2)
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#ifdef __KERNEL__
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#include <linux/compiler.h>
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#include <linux/icmpv6.h>
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#include <linux/in6.h>
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#include <linux/types.h>
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#include <net/neighbour.h>
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struct ctl_table;
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struct file;
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struct inet6_dev;
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struct net_device;
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struct net_proto_family;
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struct sk_buff;
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extern struct neigh_table nd_tbl;
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struct nd_msg {
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struct icmp6hdr icmph;
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struct in6_addr target;
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__u8 opt[0];
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};
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struct rs_msg {
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struct icmp6hdr icmph;
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__u8 opt[0];
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};
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struct ra_msg {
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struct icmp6hdr icmph;
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__be32 reachable_time;
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__be32 retrans_timer;
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};
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struct nd_opt_hdr {
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__u8 nd_opt_type;
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__u8 nd_opt_len;
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} __attribute__((__packed__));
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extern int ndisc_init(struct net_proto_family *ops);
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extern void ndisc_cleanup(void);
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extern int ndisc_rcv(struct sk_buff *skb);
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extern void ndisc_send_ns(struct net_device *dev,
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struct neighbour *neigh,
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struct in6_addr *solicit,
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struct in6_addr *daddr,
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struct in6_addr *saddr);
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extern void ndisc_send_rs(struct net_device *dev,
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struct in6_addr *saddr,
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struct in6_addr *daddr);
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extern void ndisc_forwarding_on(void);
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extern void ndisc_forwarding_off(void);
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extern void ndisc_send_redirect(struct sk_buff *skb,
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struct neighbour *neigh,
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struct in6_addr *target);
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extern int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);
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struct rt6_info * dflt_rt_lookup(void);
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/*
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* IGMP
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*/
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extern int igmp6_init(struct net_proto_family *ops);
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extern void igmp6_cleanup(void);
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extern int igmp6_event_query(struct sk_buff *skb);
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extern int igmp6_event_report(struct sk_buff *skb);
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extern void igmp6_cleanup(void);
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#ifdef CONFIG_SYSCTL
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extern int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl,
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int write,
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struct file * filp,
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void __user *buffer,
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size_t *lenp,
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loff_t *ppos);
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#endif
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extern void inet6_ifinfo_notify(int event,
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struct inet6_dev *idev);
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static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, struct in6_addr *addr)
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{
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if (dev)
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return __neigh_lookup(&nd_tbl, addr, dev, 1);
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return NULL;
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}
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#endif /* __KERNEL__ */
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#endif
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