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655 lines
14 KiB
655 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/jhash.h> |
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#include <linux/netfilter.h> |
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#include <linux/rcupdate.h> |
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#include <linux/rhashtable.h> |
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#include <linux/vmalloc.h> |
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#include <net/genetlink.h> |
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#include <net/ila.h> |
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#include <net/netns/generic.h> |
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#include <uapi/linux/genetlink.h> |
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#include "ila.h" |
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|
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struct ila_xlat_params { |
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struct ila_params ip; |
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int ifindex; |
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}; |
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struct ila_map { |
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struct ila_xlat_params xp; |
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struct rhash_head node; |
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struct ila_map __rcu *next; |
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struct rcu_head rcu; |
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}; |
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|
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#define MAX_LOCKS 1024 |
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#define LOCKS_PER_CPU 10 |
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static int alloc_ila_locks(struct ila_net *ilan) |
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{ |
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return alloc_bucket_spinlocks(&ilan->xlat.locks, &ilan->xlat.locks_mask, |
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MAX_LOCKS, LOCKS_PER_CPU, |
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GFP_KERNEL); |
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} |
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static u32 hashrnd __read_mostly; |
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static __always_inline void __ila_hash_secret_init(void) |
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{ |
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net_get_random_once(&hashrnd, sizeof(hashrnd)); |
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} |
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static inline u32 ila_locator_hash(struct ila_locator loc) |
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{ |
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u32 *v = (u32 *)loc.v32; |
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__ila_hash_secret_init(); |
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return jhash_2words(v[0], v[1], hashrnd); |
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} |
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static inline spinlock_t *ila_get_lock(struct ila_net *ilan, |
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struct ila_locator loc) |
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{ |
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return &ilan->xlat.locks[ila_locator_hash(loc) & ilan->xlat.locks_mask]; |
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} |
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static inline int ila_cmp_wildcards(struct ila_map *ila, |
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struct ila_addr *iaddr, int ifindex) |
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{ |
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return (ila->xp.ifindex && ila->xp.ifindex != ifindex); |
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} |
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static inline int ila_cmp_params(struct ila_map *ila, |
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struct ila_xlat_params *xp) |
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{ |
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return (ila->xp.ifindex != xp->ifindex); |
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} |
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static int ila_cmpfn(struct rhashtable_compare_arg *arg, |
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const void *obj) |
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{ |
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const struct ila_map *ila = obj; |
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return (ila->xp.ip.locator_match.v64 != *(__be64 *)arg->key); |
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} |
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static inline int ila_order(struct ila_map *ila) |
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{ |
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int score = 0; |
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if (ila->xp.ifindex) |
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score += 1 << 1; |
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return score; |
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} |
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static const struct rhashtable_params rht_params = { |
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.nelem_hint = 1024, |
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.head_offset = offsetof(struct ila_map, node), |
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.key_offset = offsetof(struct ila_map, xp.ip.locator_match), |
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.key_len = sizeof(u64), /* identifier */ |
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.max_size = 1048576, |
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.min_size = 256, |
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.automatic_shrinking = true, |
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.obj_cmpfn = ila_cmpfn, |
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}; |
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static int parse_nl_config(struct genl_info *info, |
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struct ila_xlat_params *xp) |
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{ |
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memset(xp, 0, sizeof(*xp)); |
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if (info->attrs[ILA_ATTR_LOCATOR]) |
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xp->ip.locator.v64 = (__force __be64)nla_get_u64( |
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info->attrs[ILA_ATTR_LOCATOR]); |
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if (info->attrs[ILA_ATTR_LOCATOR_MATCH]) |
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xp->ip.locator_match.v64 = (__force __be64)nla_get_u64( |
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info->attrs[ILA_ATTR_LOCATOR_MATCH]); |
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if (info->attrs[ILA_ATTR_CSUM_MODE]) |
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xp->ip.csum_mode = nla_get_u8(info->attrs[ILA_ATTR_CSUM_MODE]); |
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else |
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xp->ip.csum_mode = ILA_CSUM_NO_ACTION; |
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if (info->attrs[ILA_ATTR_IDENT_TYPE]) |
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xp->ip.ident_type = nla_get_u8( |
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info->attrs[ILA_ATTR_IDENT_TYPE]); |
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else |
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xp->ip.ident_type = ILA_ATYPE_USE_FORMAT; |
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if (info->attrs[ILA_ATTR_IFINDEX]) |
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xp->ifindex = nla_get_s32(info->attrs[ILA_ATTR_IFINDEX]); |
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return 0; |
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} |
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/* Must be called with rcu readlock */ |
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static inline struct ila_map *ila_lookup_wildcards(struct ila_addr *iaddr, |
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int ifindex, |
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struct ila_net *ilan) |
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{ |
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struct ila_map *ila; |
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ila = rhashtable_lookup_fast(&ilan->xlat.rhash_table, &iaddr->loc, |
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rht_params); |
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while (ila) { |
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if (!ila_cmp_wildcards(ila, iaddr, ifindex)) |
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return ila; |
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ila = rcu_access_pointer(ila->next); |
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} |
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return NULL; |
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} |
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/* Must be called with rcu readlock */ |
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static inline struct ila_map *ila_lookup_by_params(struct ila_xlat_params *xp, |
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struct ila_net *ilan) |
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{ |
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struct ila_map *ila; |
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ila = rhashtable_lookup_fast(&ilan->xlat.rhash_table, |
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&xp->ip.locator_match, |
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rht_params); |
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while (ila) { |
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if (!ila_cmp_params(ila, xp)) |
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return ila; |
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ila = rcu_access_pointer(ila->next); |
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} |
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return NULL; |
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} |
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static inline void ila_release(struct ila_map *ila) |
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{ |
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kfree_rcu(ila, rcu); |
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} |
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static void ila_free_node(struct ila_map *ila) |
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{ |
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struct ila_map *next; |
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/* Assume rcu_readlock held */ |
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while (ila) { |
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next = rcu_access_pointer(ila->next); |
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ila_release(ila); |
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ila = next; |
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} |
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} |
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static void ila_free_cb(void *ptr, void *arg) |
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{ |
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ila_free_node((struct ila_map *)ptr); |
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} |
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static int ila_xlat_addr(struct sk_buff *skb, bool sir2ila); |
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static unsigned int |
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ila_nf_input(void *priv, |
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struct sk_buff *skb, |
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const struct nf_hook_state *state) |
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{ |
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ila_xlat_addr(skb, false); |
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return NF_ACCEPT; |
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} |
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static const struct nf_hook_ops ila_nf_hook_ops[] = { |
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{ |
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.hook = ila_nf_input, |
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.pf = NFPROTO_IPV6, |
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.hooknum = NF_INET_PRE_ROUTING, |
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.priority = -1, |
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}, |
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}; |
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static int ila_add_mapping(struct net *net, struct ila_xlat_params *xp) |
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{ |
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struct ila_net *ilan = net_generic(net, ila_net_id); |
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struct ila_map *ila, *head; |
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spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match); |
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int err = 0, order; |
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if (!ilan->xlat.hooks_registered) { |
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/* We defer registering net hooks in the namespace until the |
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* first mapping is added. |
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*/ |
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err = nf_register_net_hooks(net, ila_nf_hook_ops, |
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ARRAY_SIZE(ila_nf_hook_ops)); |
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if (err) |
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return err; |
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ilan->xlat.hooks_registered = true; |
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} |
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ila = kzalloc(sizeof(*ila), GFP_KERNEL); |
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if (!ila) |
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return -ENOMEM; |
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ila_init_saved_csum(&xp->ip); |
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ila->xp = *xp; |
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order = ila_order(ila); |
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spin_lock(lock); |
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head = rhashtable_lookup_fast(&ilan->xlat.rhash_table, |
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&xp->ip.locator_match, |
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rht_params); |
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if (!head) { |
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/* New entry for the rhash_table */ |
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err = rhashtable_lookup_insert_fast(&ilan->xlat.rhash_table, |
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&ila->node, rht_params); |
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} else { |
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struct ila_map *tila = head, *prev = NULL; |
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do { |
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if (!ila_cmp_params(tila, xp)) { |
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err = -EEXIST; |
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goto out; |
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} |
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if (order > ila_order(tila)) |
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break; |
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prev = tila; |
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tila = rcu_dereference_protected(tila->next, |
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lockdep_is_held(lock)); |
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} while (tila); |
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if (prev) { |
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/* Insert in sub list of head */ |
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RCU_INIT_POINTER(ila->next, tila); |
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rcu_assign_pointer(prev->next, ila); |
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} else { |
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/* Make this ila new head */ |
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RCU_INIT_POINTER(ila->next, head); |
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err = rhashtable_replace_fast(&ilan->xlat.rhash_table, |
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&head->node, |
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&ila->node, rht_params); |
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if (err) |
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goto out; |
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} |
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} |
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out: |
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spin_unlock(lock); |
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if (err) |
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kfree(ila); |
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return err; |
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} |
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static int ila_del_mapping(struct net *net, struct ila_xlat_params *xp) |
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{ |
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struct ila_net *ilan = net_generic(net, ila_net_id); |
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struct ila_map *ila, *head, *prev; |
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spinlock_t *lock = ila_get_lock(ilan, xp->ip.locator_match); |
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int err = -ENOENT; |
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spin_lock(lock); |
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head = rhashtable_lookup_fast(&ilan->xlat.rhash_table, |
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&xp->ip.locator_match, rht_params); |
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ila = head; |
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prev = NULL; |
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while (ila) { |
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if (ila_cmp_params(ila, xp)) { |
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prev = ila; |
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ila = rcu_dereference_protected(ila->next, |
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lockdep_is_held(lock)); |
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continue; |
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} |
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err = 0; |
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if (prev) { |
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/* Not head, just delete from list */ |
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rcu_assign_pointer(prev->next, ila->next); |
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} else { |
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/* It is the head. If there is something in the |
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* sublist we need to make a new head. |
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*/ |
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head = rcu_dereference_protected(ila->next, |
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lockdep_is_held(lock)); |
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if (head) { |
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/* Put first entry in the sublist into the |
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* table |
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*/ |
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err = rhashtable_replace_fast( |
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&ilan->xlat.rhash_table, &ila->node, |
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&head->node, rht_params); |
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if (err) |
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goto out; |
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} else { |
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/* Entry no longer used */ |
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err = rhashtable_remove_fast( |
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&ilan->xlat.rhash_table, |
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&ila->node, rht_params); |
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} |
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} |
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ila_release(ila); |
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break; |
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} |
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out: |
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spin_unlock(lock); |
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return err; |
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} |
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int ila_xlat_nl_cmd_add_mapping(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct net *net = genl_info_net(info); |
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struct ila_xlat_params p; |
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int err; |
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err = parse_nl_config(info, &p); |
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if (err) |
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return err; |
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return ila_add_mapping(net, &p); |
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} |
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int ila_xlat_nl_cmd_del_mapping(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct net *net = genl_info_net(info); |
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struct ila_xlat_params xp; |
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int err; |
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err = parse_nl_config(info, &xp); |
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if (err) |
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return err; |
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ila_del_mapping(net, &xp); |
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return 0; |
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} |
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static inline spinlock_t *lock_from_ila_map(struct ila_net *ilan, |
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struct ila_map *ila) |
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{ |
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return ila_get_lock(ilan, ila->xp.ip.locator_match); |
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} |
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int ila_xlat_nl_cmd_flush(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct net *net = genl_info_net(info); |
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struct ila_net *ilan = net_generic(net, ila_net_id); |
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struct rhashtable_iter iter; |
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struct ila_map *ila; |
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spinlock_t *lock; |
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int ret = 0; |
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rhashtable_walk_enter(&ilan->xlat.rhash_table, &iter); |
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rhashtable_walk_start(&iter); |
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for (;;) { |
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ila = rhashtable_walk_next(&iter); |
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if (IS_ERR(ila)) { |
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if (PTR_ERR(ila) == -EAGAIN) |
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continue; |
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ret = PTR_ERR(ila); |
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goto done; |
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} else if (!ila) { |
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break; |
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} |
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lock = lock_from_ila_map(ilan, ila); |
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spin_lock(lock); |
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ret = rhashtable_remove_fast(&ilan->xlat.rhash_table, |
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&ila->node, rht_params); |
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if (!ret) |
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ila_free_node(ila); |
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spin_unlock(lock); |
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if (ret) |
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break; |
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} |
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done: |
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rhashtable_walk_stop(&iter); |
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rhashtable_walk_exit(&iter); |
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return ret; |
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} |
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static int ila_fill_info(struct ila_map *ila, struct sk_buff *msg) |
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{ |
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if (nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR, |
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(__force u64)ila->xp.ip.locator.v64, |
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ILA_ATTR_PAD) || |
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nla_put_u64_64bit(msg, ILA_ATTR_LOCATOR_MATCH, |
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(__force u64)ila->xp.ip.locator_match.v64, |
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ILA_ATTR_PAD) || |
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nla_put_s32(msg, ILA_ATTR_IFINDEX, ila->xp.ifindex) || |
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nla_put_u8(msg, ILA_ATTR_CSUM_MODE, ila->xp.ip.csum_mode) || |
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nla_put_u8(msg, ILA_ATTR_IDENT_TYPE, ila->xp.ip.ident_type)) |
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return -1; |
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return 0; |
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} |
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static int ila_dump_info(struct ila_map *ila, |
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u32 portid, u32 seq, u32 flags, |
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struct sk_buff *skb, u8 cmd) |
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{ |
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void *hdr; |
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hdr = genlmsg_put(skb, portid, seq, &ila_nl_family, flags, cmd); |
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if (!hdr) |
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return -ENOMEM; |
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if (ila_fill_info(ila, skb) < 0) |
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goto nla_put_failure; |
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genlmsg_end(skb, hdr); |
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return 0; |
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nla_put_failure: |
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genlmsg_cancel(skb, hdr); |
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return -EMSGSIZE; |
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} |
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int ila_xlat_nl_cmd_get_mapping(struct sk_buff *skb, struct genl_info *info) |
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{ |
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struct net *net = genl_info_net(info); |
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struct ila_net *ilan = net_generic(net, ila_net_id); |
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struct sk_buff *msg; |
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struct ila_xlat_params xp; |
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struct ila_map *ila; |
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int ret; |
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ret = parse_nl_config(info, &xp); |
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if (ret) |
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return ret; |
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
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if (!msg) |
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return -ENOMEM; |
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rcu_read_lock(); |
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ila = ila_lookup_by_params(&xp, ilan); |
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if (ila) { |
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ret = ila_dump_info(ila, |
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info->snd_portid, |
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info->snd_seq, 0, msg, |
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info->genlhdr->cmd); |
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} |
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rcu_read_unlock(); |
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if (ret < 0) |
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goto out_free; |
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return genlmsg_reply(msg, info); |
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out_free: |
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nlmsg_free(msg); |
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return ret; |
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} |
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struct ila_dump_iter { |
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struct rhashtable_iter rhiter; |
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int skip; |
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}; |
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int ila_xlat_nl_dump_start(struct netlink_callback *cb) |
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{ |
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struct net *net = sock_net(cb->skb->sk); |
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struct ila_net *ilan = net_generic(net, ila_net_id); |
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struct ila_dump_iter *iter; |
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iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
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if (!iter) |
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return -ENOMEM; |
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rhashtable_walk_enter(&ilan->xlat.rhash_table, &iter->rhiter); |
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iter->skip = 0; |
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cb->args[0] = (long)iter; |
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return 0; |
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} |
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int ila_xlat_nl_dump_done(struct netlink_callback *cb) |
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{ |
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struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args[0]; |
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rhashtable_walk_exit(&iter->rhiter); |
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kfree(iter); |
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return 0; |
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} |
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int ila_xlat_nl_dump(struct sk_buff *skb, struct netlink_callback *cb) |
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{ |
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struct ila_dump_iter *iter = (struct ila_dump_iter *)cb->args[0]; |
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struct rhashtable_iter *rhiter = &iter->rhiter; |
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int skip = iter->skip; |
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struct ila_map *ila; |
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int ret; |
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|
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rhashtable_walk_start(rhiter); |
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|
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/* Get first entry */ |
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ila = rhashtable_walk_peek(rhiter); |
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if (ila && !IS_ERR(ila) && skip) { |
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/* Skip over visited entries */ |
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|
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while (ila && skip) { |
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/* Skip over any ila entries in this list that we |
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* have already dumped. |
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*/ |
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ila = rcu_access_pointer(ila->next); |
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skip--; |
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} |
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} |
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skip = 0; |
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for (;;) { |
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if (IS_ERR(ila)) { |
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ret = PTR_ERR(ila); |
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if (ret == -EAGAIN) { |
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/* Table has changed and iter has reset. Return |
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* -EAGAIN to the application even if we have |
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* written data to the skb. The application |
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* needs to deal with this. |
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*/ |
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goto out_ret; |
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} else { |
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break; |
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} |
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} else if (!ila) { |
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ret = 0; |
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break; |
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} |
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while (ila) { |
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ret = ila_dump_info(ila, NETLINK_CB(cb->skb).portid, |
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cb->nlh->nlmsg_seq, NLM_F_MULTI, |
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skb, ILA_CMD_GET); |
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if (ret) |
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goto out; |
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skip++; |
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ila = rcu_access_pointer(ila->next); |
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} |
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skip = 0; |
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ila = rhashtable_walk_next(rhiter); |
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} |
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out: |
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iter->skip = skip; |
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ret = (skb->len ? : ret); |
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|
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out_ret: |
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rhashtable_walk_stop(rhiter); |
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return ret; |
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} |
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|
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int ila_xlat_init_net(struct net *net) |
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{ |
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struct ila_net *ilan = net_generic(net, ila_net_id); |
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int err; |
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|
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err = alloc_ila_locks(ilan); |
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if (err) |
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return err; |
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|
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rhashtable_init(&ilan->xlat.rhash_table, &rht_params); |
|
|
|
return 0; |
|
} |
|
|
|
void ila_xlat_exit_net(struct net *net) |
|
{ |
|
struct ila_net *ilan = net_generic(net, ila_net_id); |
|
|
|
rhashtable_free_and_destroy(&ilan->xlat.rhash_table, ila_free_cb, NULL); |
|
|
|
free_bucket_spinlocks(ilan->xlat.locks); |
|
|
|
if (ilan->xlat.hooks_registered) |
|
nf_unregister_net_hooks(net, ila_nf_hook_ops, |
|
ARRAY_SIZE(ila_nf_hook_ops)); |
|
} |
|
|
|
static int ila_xlat_addr(struct sk_buff *skb, bool sir2ila) |
|
{ |
|
struct ila_map *ila; |
|
struct ipv6hdr *ip6h = ipv6_hdr(skb); |
|
struct net *net = dev_net(skb->dev); |
|
struct ila_net *ilan = net_generic(net, ila_net_id); |
|
struct ila_addr *iaddr = ila_a2i(&ip6h->daddr); |
|
|
|
/* Assumes skb contains a valid IPv6 header that is pulled */ |
|
|
|
/* No check here that ILA type in the mapping matches what is in the |
|
* address. We assume that whatever sender gaves us can be translated. |
|
* The checksum mode however is relevant. |
|
*/ |
|
|
|
rcu_read_lock(); |
|
|
|
ila = ila_lookup_wildcards(iaddr, skb->dev->ifindex, ilan); |
|
if (ila) |
|
ila_update_ipv6_locator(skb, &ila->xp.ip, sir2ila); |
|
|
|
rcu_read_unlock(); |
|
|
|
return 0; |
|
}
|
|
|