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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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/* * ICMP codes for neighbour discovery messages */
#define NDISC_ROUTER_SOLICITATION 133#define NDISC_ROUTER_ADVERTISEMENT 134#define NDISC_NEIGHBOUR_SOLICITATION 135#define NDISC_NEIGHBOUR_ADVERTISEMENT 136#define NDISC_REDIRECT 137
/* * Router type: cross-layer information from link-layer to * IPv6 layer reported by certain link types (e.g., RFC4214). */#define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */#define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */#define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */#define NDISC_NODETYPE_DEFAULT 3 /* default router */
/* * ndisc options */
enum { __ND_OPT_PREFIX_INFO_END = 0, ND_OPT_SOURCE_LL_ADDR = 1, /* RFC2461 */ ND_OPT_TARGET_LL_ADDR = 2, /* RFC2461 */ ND_OPT_PREFIX_INFO = 3, /* RFC2461 */ ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */ ND_OPT_MTU = 5, /* RFC2461 */ ND_OPT_NONCE = 14, /* RFC7527 */ __ND_OPT_ARRAY_MAX, ND_OPT_ROUTE_INFO = 24, /* RFC4191 */ ND_OPT_RDNSS = 25, /* RFC5006 */ ND_OPT_DNSSL = 31, /* RFC6106 */ ND_OPT_6CO = 34, /* RFC6775 */ ND_OPT_CAPTIVE_PORTAL = 37, /* RFC7710 */ ND_OPT_PREF64 = 38, /* RFC8781 */ __ND_OPT_MAX};
#define MAX_RTR_SOLICITATION_DELAY HZ
#define ND_REACHABLE_TIME (30*HZ)#define ND_RETRANS_TIMER HZ
#include <linux/compiler.h>#include <linux/icmpv6.h>#include <linux/in6.h>#include <linux/types.h>#include <linux/if_arp.h>#include <linux/netdevice.h>#include <linux/hash.h>
#include <net/neighbour.h>
struct ctl_table;struct inet6_dev;struct net_device;struct net_proto_family;struct sk_buff;struct prefix_info;
extern struct neigh_table nd_tbl;
static inline struct neigh_table *nd_table(struct net *net){#if IS_ENABLED(CONFIG_IPV6) if (disable_ipv6_mod) return &nd_tbl;#endif return net->neigh_tables[NEIGH_ND_TABLE];}
struct nd_msg { struct icmp6hdr icmph; struct in6_addr target; __u8 opt[];};
struct rs_msg { struct icmp6hdr icmph; __u8 opt[];};
struct ra_msg { struct icmp6hdr icmph; __be32 reachable_time; __be32 retrans_timer;};
struct rd_msg { struct icmp6hdr icmph; struct in6_addr target; struct in6_addr dest; __u8 opt[];};
struct nd_opt_hdr { __u8 nd_opt_type; __u8 nd_opt_len;} __packed;
/* ND options */struct ndisc_options { struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];#ifdef CONFIG_IPV6_ROUTE_INFO struct nd_opt_hdr *nd_opts_ri; struct nd_opt_hdr *nd_opts_ri_end;#endif struct nd_opt_hdr *nd_useropts; struct nd_opt_hdr *nd_useropts_end;#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];#endif};
#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]#define nd_opts_nonce nd_opt_array[ND_OPT_NONCE]#define nd_802154_opts_src_lladdr nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]#define nd_802154_opts_tgt_lladdr nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]
#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
struct ndisc_options *ndisc_parse_options(const struct net_device *dev, u8 *opt, int opt_len, struct ndisc_options *ndopts);
void __ndisc_fill_addr_option(struct sk_buff *skb, int type, const void *data, int data_len, int pad);
#define NDISC_OPS_REDIRECT_DATA_SPACE 2
/* * This structure defines the hooks for IPv6 neighbour discovery. * The following hooks can be defined; unless noted otherwise, they are * optional and can be filled with a null pointer. * * int (*parse_options)(const struct net_device *dev, * struct nd_opt_hdr *nd_opt, * struct ndisc_options *ndopts): * This function is called while parsing ndisc ops and put each position * as pointer into ndopts. If this function return unequal 0, then this * function took care about the ndisc option, if 0 then the IPv6 ndisc * option parser will take care about that option. * * void (*update)(const struct net_device *dev, struct neighbour *n, * u32 flags, u8 icmp6_type, * const struct ndisc_options *ndopts): * This function is called when IPv6 ndisc updates the neighbour cache * entry. Additional options which can be updated may be previously * parsed by parse_opts callback and accessible over ndopts parameter. * * int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type, * struct neighbour *neigh, u8 *ha_buf, * u8 **ha): * This function is called when the necessary option space will be * calculated before allocating a skb. The parameters neigh, ha_buf * abd ha are available on NDISC_REDIRECT messages only. * * void (*fill_addr_option)(const struct net_device *dev, * struct sk_buff *skb, u8 icmp6_type, * const u8 *ha): * This function is called when the skb will finally fill the option * fields inside skb. NOTE: this callback should fill the option * fields to the skb which are previously indicated by opt_space * parameter. That means the decision to add such option should * not lost between these two callbacks, e.g. protected by interface * up state. * * void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev, * const struct prefix_info *pinfo, * struct inet6_dev *in6_dev, * struct in6_addr *addr, * int addr_type, u32 addr_flags, * bool sllao, bool tokenized, * __u32 valid_lft, u32 prefered_lft, * bool dev_addr_generated): * This function is called when a RA messages is received with valid * PIO option fields and an IPv6 address will be added to the interface * for autoconfiguration. The parameter dev_addr_generated reports about * if the address was based on dev->dev_addr or not. This can be used * to add a second address if link-layer operates with two link layer * addresses. E.g. 802.15.4 6LoWPAN. */struct ndisc_ops { int (*parse_options)(const struct net_device *dev, struct nd_opt_hdr *nd_opt, struct ndisc_options *ndopts); void (*update)(const struct net_device *dev, struct neighbour *n, u32 flags, u8 icmp6_type, const struct ndisc_options *ndopts); int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type, struct neighbour *neigh, u8 *ha_buf, u8 **ha); void (*fill_addr_option)(const struct net_device *dev, struct sk_buff *skb, u8 icmp6_type, const u8 *ha); void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev, const struct prefix_info *pinfo, struct inet6_dev *in6_dev, struct in6_addr *addr, int addr_type, u32 addr_flags, bool sllao, bool tokenized, __u32 valid_lft, u32 prefered_lft, bool dev_addr_generated);};
#if IS_ENABLED(CONFIG_IPV6)static inline int ndisc_ops_parse_options(const struct net_device *dev, struct nd_opt_hdr *nd_opt, struct ndisc_options *ndopts){ if (dev->ndisc_ops && dev->ndisc_ops->parse_options) return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts); else return 0;}
static inline void ndisc_ops_update(const struct net_device *dev, struct neighbour *n, u32 flags, u8 icmp6_type, const struct ndisc_options *ndopts){ if (dev->ndisc_ops && dev->ndisc_ops->update) dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);}
static inline int ndisc_ops_opt_addr_space(const struct net_device *dev, u8 icmp6_type){ if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space && icmp6_type != NDISC_REDIRECT) return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL, NULL, NULL); else return 0;}
static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev, struct neighbour *neigh, u8 *ha_buf, u8 **ha){ if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space) return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT, neigh, ha_buf, ha); else return 0;}
static inline void ndisc_ops_fill_addr_option(const struct net_device *dev, struct sk_buff *skb, u8 icmp6_type){ if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option && icmp6_type != NDISC_REDIRECT) dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);}
static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev, struct sk_buff *skb, const u8 *ha){ if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option) dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);}
static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net, struct net_device *dev, const struct prefix_info *pinfo, struct inet6_dev *in6_dev, struct in6_addr *addr, int addr_type, u32 addr_flags, bool sllao, bool tokenized, __u32 valid_lft, u32 prefered_lft, bool dev_addr_generated){ if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr) dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev, addr, addr_type, addr_flags, sllao, tokenized, valid_lft, prefered_lft, dev_addr_generated);}#endif
/* * Return the padding between the option length and the start of the * link addr. Currently only IP-over-InfiniBand needs this, although * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may * also need a pad of 2. */static inline int ndisc_addr_option_pad(unsigned short type){ switch (type) { case ARPHRD_INFINIBAND: return 2; default: return 0; }}
static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad){ return NDISC_OPT_SPACE(addr_len + pad);}
#if IS_ENABLED(CONFIG_IPV6)static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type){ return __ndisc_opt_addr_space(dev->addr_len, ndisc_addr_option_pad(dev->type)) + ndisc_ops_opt_addr_space(dev, icmp6_type);}
static inline int ndisc_redirect_opt_addr_space(struct net_device *dev, struct neighbour *neigh, u8 *ops_data_buf, u8 **ops_data){ return __ndisc_opt_addr_space(dev->addr_len, ndisc_addr_option_pad(dev->type)) + ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf, ops_data);}#endif
static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p, unsigned char addr_len, int prepad){ u8 *lladdr = (u8 *)(p + 1); int lladdrlen = p->nd_opt_len << 3; if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad)) return NULL; return lladdr + prepad;}
static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, struct net_device *dev){ return __ndisc_opt_addr_data(p, dev->addr_len, ndisc_addr_option_pad(dev->type));}
static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd){ const u32 *p32 = pkey;
return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) + (p32[1] * hash_rnd[1]) + (p32[2] * hash_rnd[2]) + (p32[3] * hash_rnd[3]));}
static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey){ struct neigh_table *tbl = nd_table(dev_net(dev));
return ___neigh_lookup_noref(tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);}
static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey){ struct neighbour *n;
rcu_read_lock(); n = __ipv6_neigh_lookup_noref(dev, pkey); if (n && !refcount_inc_not_zero(&n->refcnt)) n = NULL; rcu_read_unlock();
return n;}
static inline struct neighbour *ipv6_neigh_lookup(struct net_device *dev, const void *pkey){ struct neigh_table *tbl = nd_table(dev_net(dev));
return neigh_lookup(tbl, pkey, dev);}
static inline struct neighbour *ipv6_neigh_create(struct net_device *dev, const void *pkey){ struct neigh_table *tbl = nd_table(dev_net(dev));
return neigh_create(tbl, pkey, dev);}
static inline struct neighbour *ipv6_neigh_create_noref(struct net_device *dev, const void *pkey){ struct neigh_table *tbl = nd_table(dev_net(dev));
return __neigh_create(tbl, pkey, dev, false);}
static inline void __ipv6_confirm_neigh(struct net_device *dev, const void *pkey){ struct neighbour *n;
rcu_read_lock(); n = __ipv6_neigh_lookup_noref(dev, pkey); neigh_confirm(n); rcu_read_unlock();}
static inline struct neighbour *ip_neigh_gw6(struct net_device *dev, const void *addr){#if IS_ENABLED(CONFIG_IPV6) struct neighbour *neigh;
neigh = __ipv6_neigh_lookup_noref(dev, addr); if (unlikely(!neigh)) neigh = ipv6_neigh_create_noref(dev, addr);
return neigh;#else return ERR_PTR(-EAFNOSUPPORT);#endif}
int ndisc_init(void);int ndisc_late_init(void);
void ndisc_late_cleanup(void);void ndisc_cleanup(void);
enum skb_drop_reason ndisc_rcv(struct sk_buff *skb);
struct sk_buff *ndisc_ns_create(struct net_device *dev, const struct in6_addr *solicit, const struct in6_addr *saddr, u64 nonce);void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, const struct in6_addr *daddr, const struct in6_addr *saddr, u64 nonce);
void ndisc_send_skb(struct sk_buff *skb, const struct in6_addr *daddr, const struct in6_addr *saddr);
void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, const struct in6_addr *daddr);
void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, const struct in6_addr *solicited_addr, bool router, bool solicited, bool override, bool inc_opt);
void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir);
void ndisc_update(const struct net_device *dev, struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, struct ndisc_options *ndopts);
int ndisc_check_ns_na(struct sk_buff *skb);
/* * IGMP */int igmp6_init(void);int igmp6_late_init(void);
void igmp6_cleanup(void);void igmp6_late_cleanup(void);
void igmp6_event_query(struct sk_buff *skb);
void igmp6_event_report(struct sk_buff *skb);
#ifdef CONFIG_SYSCTLint ndisc_ifinfo_sysctl_change(const struct ctl_table *ctl, int write, void *buffer, size_t *lenp, loff_t *ppos);#endif
void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
#endif