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When loading the ipv6 module, ndisc_init() is called before ip6_route_init(). As the former registers a handler calling fib6_run_gc(), this opens a window to run the garbage collector before necessary data structures are initialized. If a network device is initialized in this window, adding MAC address to it triggers a NETDEV_CHANGEADDR event, leading to a crash in fib6_clean_all(). Take the event handler registration out of ndisc_init() into a separate function ndisc_late_init() and move it after ip6_route_init(). Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
249 lines
6.2 KiB
C
249 lines
6.2 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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* 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_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_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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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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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 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[0];
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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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};
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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 NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
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extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
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struct ndisc_options *ndopts);
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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(struct net_device *dev)
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{
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return NDISC_OPT_SPACE(dev->addr_len +
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ndisc_addr_option_pad(dev->type));
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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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u8 *lladdr = (u8 *)(p + 1);
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int lladdrlen = p->nd_opt_len << 3;
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int prepad = ndisc_addr_option_pad(dev->type);
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if (lladdrlen != ndisc_opt_addr_space(dev))
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return NULL;
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return lladdr + prepad;
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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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struct neigh_hash_table *nht;
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const u32 *p32 = pkey;
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struct neighbour *n;
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u32 hash_val;
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nht = rcu_dereference_bh(nd_tbl.nht);
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hash_val = ndisc_hashfn(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
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for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
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n != NULL;
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n = rcu_dereference_bh(n->next)) {
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u32 *n32 = (u32 *) n->primary_key;
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if (n->dev == dev &&
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((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
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(n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0)
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return n;
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}
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return NULL;
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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 && !atomic_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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extern int ndisc_init(void);
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extern int ndisc_late_init(void);
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extern void ndisc_late_cleanup(void);
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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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const struct in6_addr *solicit,
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const struct in6_addr *daddr,
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const struct in6_addr *saddr);
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extern void ndisc_send_rs(struct net_device *dev,
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const struct in6_addr *saddr,
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const struct in6_addr *daddr);
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extern void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
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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,
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bool inc_opt);
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extern void ndisc_send_redirect(struct sk_buff *skb,
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const struct in6_addr *target);
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extern int ndisc_mc_map(const struct in6_addr *addr, char *buf,
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struct net_device *dev, int dir);
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/*
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* IGMP
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*/
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extern int igmp6_init(void);
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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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#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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void __user *buffer,
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size_t *lenp,
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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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extern void inet6_ifinfo_notify(int event,
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struct inet6_dev *idev);
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#endif
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