506 lines
15 KiB
C
506 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NDISC_H
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#define _NDISC_H
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#include <net/ipv6_stubs.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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* Router type: cross-layer information from link-layer to
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* IPv6 layer reported by certain link types (e.g., RFC4214).
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*/
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#define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */
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#define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */
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#define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */
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#define NDISC_NODETYPE_DEFAULT 3 /* default router */
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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_NONCE = 14, /* RFC7527 */
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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_DNSSL = 31, /* RFC6106 */
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ND_OPT_6CO = 34, /* RFC6775 */
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ND_OPT_CAPTIVE_PORTAL = 37, /* RFC7710 */
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ND_OPT_PREF64 = 38, /* RFC8781 */
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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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#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 <linux/if_arp.h>
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#include <linux/netdevice.h>
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#include <linux/hash.h>
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#include <net/neighbour.h>
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/* Set to 3 to get tracing... */
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#define ND_DEBUG 1
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#define ND_PRINTK(val, level, fmt, ...) \
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do { \
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if (val <= ND_DEBUG) \
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net_##level##_ratelimited(fmt, ##__VA_ARGS__); \
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} while (0)
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struct ctl_table;
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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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struct prefix_info;
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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[];
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};
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struct rs_msg {
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struct icmp6hdr icmph;
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__u8 opt[];
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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 rd_msg {
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struct icmp6hdr icmph;
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struct in6_addr target;
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struct in6_addr dest;
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__u8 opt[];
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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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} __packed;
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/* ND options */
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struct ndisc_options {
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struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
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#ifdef CONFIG_IPV6_ROUTE_INFO
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struct nd_opt_hdr *nd_opts_ri;
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struct nd_opt_hdr *nd_opts_ri_end;
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#endif
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struct nd_opt_hdr *nd_useropts;
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struct nd_opt_hdr *nd_useropts_end;
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#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
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struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];
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#endif
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};
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#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
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#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
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#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
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#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
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#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
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#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
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#define nd_opts_nonce nd_opt_array[ND_OPT_NONCE]
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#define nd_802154_opts_src_lladdr nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]
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#define nd_802154_opts_tgt_lladdr nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]
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#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
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struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
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u8 *opt, int opt_len,
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struct ndisc_options *ndopts);
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void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
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int data_len, int pad);
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#define NDISC_OPS_REDIRECT_DATA_SPACE 2
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/*
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* This structure defines the hooks for IPv6 neighbour discovery.
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* The following hooks can be defined; unless noted otherwise, they are
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* optional and can be filled with a null pointer.
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*
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* int (*is_useropt)(u8 nd_opt_type):
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* This function is called when IPv6 decide RA userspace options. if
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* this function returns 1 then the option given by nd_opt_type will
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* be handled as userspace option additional to the IPv6 options.
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*
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* int (*parse_options)(const struct net_device *dev,
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* struct nd_opt_hdr *nd_opt,
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* struct ndisc_options *ndopts):
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* This function is called while parsing ndisc ops and put each position
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* as pointer into ndopts. If this function return unequal 0, then this
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* function took care about the ndisc option, if 0 then the IPv6 ndisc
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* option parser will take care about that option.
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*
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* void (*update)(const struct net_device *dev, struct neighbour *n,
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* u32 flags, u8 icmp6_type,
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* const struct ndisc_options *ndopts):
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* This function is called when IPv6 ndisc updates the neighbour cache
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* entry. Additional options which can be updated may be previously
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* parsed by parse_opts callback and accessible over ndopts parameter.
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*
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* int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
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* struct neighbour *neigh, u8 *ha_buf,
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* u8 **ha):
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* This function is called when the necessary option space will be
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* calculated before allocating a skb. The parameters neigh, ha_buf
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* abd ha are available on NDISC_REDIRECT messages only.
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*
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* void (*fill_addr_option)(const struct net_device *dev,
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* struct sk_buff *skb, u8 icmp6_type,
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* const u8 *ha):
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* This function is called when the skb will finally fill the option
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* fields inside skb. NOTE: this callback should fill the option
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* fields to the skb which are previously indicated by opt_space
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* parameter. That means the decision to add such option should
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* not lost between these two callbacks, e.g. protected by interface
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* up state.
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*
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* void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
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* const struct prefix_info *pinfo,
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* struct inet6_dev *in6_dev,
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* struct in6_addr *addr,
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* int addr_type, u32 addr_flags,
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* bool sllao, bool tokenized,
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* __u32 valid_lft, u32 prefered_lft,
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* bool dev_addr_generated):
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* This function is called when a RA messages is received with valid
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* PIO option fields and an IPv6 address will be added to the interface
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* for autoconfiguration. The parameter dev_addr_generated reports about
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* if the address was based on dev->dev_addr or not. This can be used
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* to add a second address if link-layer operates with two link layer
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* addresses. E.g. 802.15.4 6LoWPAN.
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*/
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struct ndisc_ops {
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int (*is_useropt)(u8 nd_opt_type);
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int (*parse_options)(const struct net_device *dev,
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struct nd_opt_hdr *nd_opt,
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struct ndisc_options *ndopts);
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void (*update)(const struct net_device *dev, struct neighbour *n,
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u32 flags, u8 icmp6_type,
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const struct ndisc_options *ndopts);
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int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
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struct neighbour *neigh, u8 *ha_buf,
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u8 **ha);
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void (*fill_addr_option)(const struct net_device *dev,
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struct sk_buff *skb, u8 icmp6_type,
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const u8 *ha);
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void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
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const struct prefix_info *pinfo,
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struct inet6_dev *in6_dev,
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struct in6_addr *addr,
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int addr_type, u32 addr_flags,
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bool sllao, bool tokenized,
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__u32 valid_lft, u32 prefered_lft,
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bool dev_addr_generated);
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};
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#if IS_ENABLED(CONFIG_IPV6)
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static inline int ndisc_ops_is_useropt(const struct net_device *dev,
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u8 nd_opt_type)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
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return dev->ndisc_ops->is_useropt(nd_opt_type);
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else
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return 0;
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}
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static inline int ndisc_ops_parse_options(const struct net_device *dev,
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struct nd_opt_hdr *nd_opt,
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struct ndisc_options *ndopts)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
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return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
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else
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return 0;
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}
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static inline void ndisc_ops_update(const struct net_device *dev,
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struct neighbour *n, u32 flags,
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u8 icmp6_type,
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const struct ndisc_options *ndopts)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->update)
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dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
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}
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static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
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u8 icmp6_type)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
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icmp6_type != NDISC_REDIRECT)
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return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
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NULL, NULL);
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else
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return 0;
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}
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static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
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struct neighbour *neigh,
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u8 *ha_buf, u8 **ha)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
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return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
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neigh, ha_buf, ha);
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else
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return 0;
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}
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static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
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struct sk_buff *skb,
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u8 icmp6_type)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
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icmp6_type != NDISC_REDIRECT)
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dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
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}
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static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
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struct sk_buff *skb,
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const u8 *ha)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
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dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
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}
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static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
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struct net_device *dev,
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const struct prefix_info *pinfo,
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struct inet6_dev *in6_dev,
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struct in6_addr *addr,
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int addr_type, u32 addr_flags,
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bool sllao, bool tokenized,
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__u32 valid_lft,
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u32 prefered_lft,
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bool dev_addr_generated)
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{
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if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
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dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
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addr, addr_type,
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addr_flags, sllao,
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tokenized, valid_lft,
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prefered_lft,
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dev_addr_generated);
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}
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#endif
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/*
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* Return the padding between the option length and the start of the
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* link addr. Currently only IP-over-InfiniBand needs this, although
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* if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
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* also need a pad of 2.
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*/
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static inline int ndisc_addr_option_pad(unsigned short type)
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{
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switch (type) {
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case ARPHRD_INFINIBAND: return 2;
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default: return 0;
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}
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}
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static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad)
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{
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return NDISC_OPT_SPACE(addr_len + pad);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type)
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{
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return __ndisc_opt_addr_space(dev->addr_len,
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ndisc_addr_option_pad(dev->type)) +
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ndisc_ops_opt_addr_space(dev, icmp6_type);
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}
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static inline int ndisc_redirect_opt_addr_space(struct net_device *dev,
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struct neighbour *neigh,
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u8 *ops_data_buf,
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u8 **ops_data)
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{
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return __ndisc_opt_addr_space(dev->addr_len,
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ndisc_addr_option_pad(dev->type)) +
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ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf,
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ops_data);
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}
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#endif
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static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p,
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unsigned char addr_len, int prepad)
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{
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u8 *lladdr = (u8 *)(p + 1);
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int lladdrlen = p->nd_opt_len << 3;
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if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad))
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return NULL;
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return lladdr + prepad;
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}
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static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
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struct net_device *dev)
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{
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return __ndisc_opt_addr_data(p, dev->addr_len,
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ndisc_addr_option_pad(dev->type));
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}
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static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
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{
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const u32 *p32 = pkey;
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return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
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(p32[1] * hash_rnd[1]) +
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(p32[2] * hash_rnd[2]) +
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(p32[3] * hash_rnd[3]));
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}
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static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
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{
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return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
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}
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static inline
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struct neighbour *__ipv6_neigh_lookup_noref_stub(struct net_device *dev,
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const void *pkey)
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{
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return ___neigh_lookup_noref(ipv6_stub->nd_tbl, neigh_key_eq128,
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ndisc_hashfn, pkey, dev);
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}
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static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
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{
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struct neighbour *n;
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rcu_read_lock_bh();
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n = __ipv6_neigh_lookup_noref(dev, pkey);
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if (n && !refcount_inc_not_zero(&n->refcnt))
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n = NULL;
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rcu_read_unlock_bh();
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return n;
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}
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static inline void __ipv6_confirm_neigh(struct net_device *dev,
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const void *pkey)
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{
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struct neighbour *n;
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rcu_read_lock_bh();
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n = __ipv6_neigh_lookup_noref(dev, pkey);
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if (n) {
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unsigned long now = jiffies;
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/* avoid dirtying neighbour */
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if (READ_ONCE(n->confirmed) != now)
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WRITE_ONCE(n->confirmed, now);
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}
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rcu_read_unlock_bh();
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}
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static inline void __ipv6_confirm_neigh_stub(struct net_device *dev,
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const void *pkey)
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{
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struct neighbour *n;
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rcu_read_lock_bh();
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n = __ipv6_neigh_lookup_noref_stub(dev, pkey);
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if (n) {
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unsigned long now = jiffies;
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/* avoid dirtying neighbour */
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if (READ_ONCE(n->confirmed) != now)
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WRITE_ONCE(n->confirmed, now);
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}
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rcu_read_unlock_bh();
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}
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/* uses ipv6_stub and is meant for use outside of IPv6 core */
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static inline struct neighbour *ip_neigh_gw6(struct net_device *dev,
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const void *addr)
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{
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struct neighbour *neigh;
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neigh = __ipv6_neigh_lookup_noref_stub(dev, addr);
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if (unlikely(!neigh))
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neigh = __neigh_create(ipv6_stub->nd_tbl, addr, dev, false);
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return neigh;
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}
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int ndisc_init(void);
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int ndisc_late_init(void);
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void ndisc_late_cleanup(void);
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void ndisc_cleanup(void);
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int ndisc_rcv(struct sk_buff *skb);
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void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
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const struct in6_addr *daddr, const struct in6_addr *saddr,
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u64 nonce);
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void ndisc_send_rs(struct net_device *dev,
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const struct in6_addr *saddr, const struct in6_addr *daddr);
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void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
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const struct in6_addr *solicited_addr,
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bool router, bool solicited, bool override, bool inc_opt);
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void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
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int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
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int dir);
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void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
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const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
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struct ndisc_options *ndopts);
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/*
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* IGMP
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*/
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int igmp6_init(void);
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int igmp6_late_init(void);
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void igmp6_cleanup(void);
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void igmp6_late_cleanup(void);
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int igmp6_event_query(struct sk_buff *skb);
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int igmp6_event_report(struct sk_buff *skb);
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#ifdef CONFIG_SYSCTL
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int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
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void *buffer, size_t *lenp, loff_t *ppos);
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int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen);
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#endif
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void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
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#endif
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