diff options
author | Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | 2013-04-08 21:05:44 +0200 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-04-29 20:08:56 +0200 |
commit | 1feab10d7e6ddb5e13d6a4bd93a1b877390262ec (patch) | |
tree | 7da5d5aba00e9bd207de7b8c493c589c826f8604 /net/netfilter | |
parent | b0da3905bb1eb0969470f57b18c978f902475c78 (diff) | |
download | op-kernel-dev-1feab10d7e6ddb5e13d6a4bd93a1b877390262ec.zip op-kernel-dev-1feab10d7e6ddb5e13d6a4bd93a1b877390262ec.tar.gz |
netfilter: ipset: Unified hash type generation
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r-- | net/netfilter/ipset/ip_set_hash_gen.h | 1039 |
1 files changed, 1039 insertions, 0 deletions
diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h new file mode 100644 index 0000000..2ba7d4e --- /dev/null +++ b/net/netfilter/ipset/ip_set_hash_gen.h @@ -0,0 +1,1039 @@ +/* Copyright (C) 2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _IP_SET_HASH_GEN_H +#define _IP_SET_HASH_GEN_H + +#include <linux/rcupdate.h> +#include <linux/jhash.h> +#include <linux/netfilter/ipset/ip_set_timeout.h> +#ifndef rcu_dereference_bh +#define rcu_dereference_bh(p) rcu_dereference(p) +#endif + +#define CONCAT(a, b) a##b +#define TOKEN(a, b) CONCAT(a, b) + +/* Hashing which uses arrays to resolve clashing. The hash table is resized + * (doubled) when searching becomes too long. + * Internally jhash is used with the assumption that the size of the + * stored data is a multiple of sizeof(u32). If storage supports timeout, + * the timeout field must be the last one in the data structure - that field + * is ignored when computing the hash key. + * + * Readers and resizing + * + * Resizing can be triggered by userspace command only, and those + * are serialized by the nfnl mutex. During resizing the set is + * read-locked, so the only possible concurrent operations are + * the kernel side readers. Those must be protected by proper RCU locking. + */ + +/* Number of elements to store in an initial array block */ +#define AHASH_INIT_SIZE 4 +/* Max number of elements to store in an array block */ +#define AHASH_MAX_SIZE (3*AHASH_INIT_SIZE) + +/* Max number of elements can be tuned */ +#ifdef IP_SET_HASH_WITH_MULTI +#define AHASH_MAX(h) ((h)->ahash_max) + +static inline u8 +tune_ahash_max(u8 curr, u32 multi) +{ + u32 n; + + if (multi < curr) + return curr; + + n = curr + AHASH_INIT_SIZE; + /* Currently, at listing one hash bucket must fit into a message. + * Therefore we have a hard limit here. + */ + return n > curr && n <= 64 ? n : curr; +} +#define TUNE_AHASH_MAX(h, multi) \ + ((h)->ahash_max = tune_ahash_max((h)->ahash_max, multi)) +#else +#define AHASH_MAX(h) AHASH_MAX_SIZE +#define TUNE_AHASH_MAX(h, multi) +#endif + +/* A hash bucket */ +struct hbucket { + void *value; /* the array of the values */ + u8 size; /* size of the array */ + u8 pos; /* position of the first free entry */ +}; + +/* The hash table: the table size stored here in order to make resizing easy */ +struct htable { + u8 htable_bits; /* size of hash table == 2^htable_bits */ + struct hbucket bucket[0]; /* hashtable buckets */ +}; + +#define hbucket(h, i) (&((h)->bucket[i])) + +/* Book-keeping of the prefixes added to the set */ +struct net_prefixes { + u8 cidr; /* the different cidr values in the set */ + u32 nets; /* number of elements per cidr */ +}; + +/* Compute the hash table size */ +static size_t +htable_size(u8 hbits) +{ + size_t hsize; + + /* We must fit both into u32 in jhash and size_t */ + if (hbits > 31) + return 0; + hsize = jhash_size(hbits); + if ((((size_t)-1) - sizeof(struct htable))/sizeof(struct hbucket) + < hsize) + return 0; + + return hsize * sizeof(struct hbucket) + sizeof(struct htable); +} + +/* Compute htable_bits from the user input parameter hashsize */ +static u8 +htable_bits(u32 hashsize) +{ + /* Assume that hashsize == 2^htable_bits */ + u8 bits = fls(hashsize - 1); + if (jhash_size(bits) != hashsize) + /* Round up to the first 2^n value */ + bits = fls(hashsize); + + return bits; +} + +/* Destroy the hashtable part of the set */ +static void +ahash_destroy(struct htable *t) +{ + struct hbucket *n; + u32 i; + + for (i = 0; i < jhash_size(t->htable_bits); i++) { + n = hbucket(t, i); + if (n->size) + /* FIXME: use slab cache */ + kfree(n->value); + } + + ip_set_free(t); +} + +static int +hbucket_elem_add(struct hbucket *n, u8 ahash_max, size_t dsize) +{ + if (n->pos >= n->size) { + void *tmp; + + if (n->size >= ahash_max) + /* Trigger rehashing */ + return -EAGAIN; + + tmp = kzalloc((n->size + AHASH_INIT_SIZE) * dsize, + GFP_ATOMIC); + if (!tmp) + return -ENOMEM; + if (n->size) { + memcpy(tmp, n->value, n->size * dsize); + kfree(n->value); + } + n->value = tmp; + n->size += AHASH_INIT_SIZE; + } + return 0; +} + +#ifdef IP_SET_HASH_WITH_NETS +#ifdef IP_SET_HASH_WITH_NETS_PACKED +/* When cidr is packed with nomatch, cidr - 1 is stored in the entry */ +#define CIDR(cidr) (cidr + 1) +#else +#define CIDR(cidr) (cidr) +#endif + +#define SET_HOST_MASK(family) (family == AF_INET ? 32 : 128) + +#ifdef IP_SET_HASH_WITH_MULTI +#define NETS_LENGTH(family) (SET_HOST_MASK(family) + 1) +#else +#define NETS_LENGTH(family) SET_HOST_MASK(family) +#endif + +#else +#define NETS_LENGTH(family) 0 +#endif /* IP_SET_HASH_WITH_NETS */ + +#define ext_timeout(e, h) \ +(unsigned long *)(((void *)(e)) + (h)->offset[IPSET_OFFSET_TIMEOUT]) + +#endif /* _IP_SET_HASH_GEN_H */ + +/* Family dependent templates */ + +#undef ahash_data +#undef mtype_data_equal +#undef mtype_do_data_match +#undef mtype_data_set_flags +#undef mtype_data_reset_flags +#undef mtype_data_netmask +#undef mtype_data_list +#undef mtype_data_next +#undef mtype_elem + +#undef mtype_add_cidr +#undef mtype_del_cidr +#undef mtype_ahash_memsize +#undef mtype_flush +#undef mtype_destroy +#undef mtype_gc_init +#undef mtype_same_set +#undef mtype_kadt +#undef mtype_uadt +#undef mtype + +#undef mtype_add +#undef mtype_del +#undef mtype_test_cidrs +#undef mtype_test +#undef mtype_expire +#undef mtype_resize +#undef mtype_head +#undef mtype_list +#undef mtype_gc +#undef mtype_gc_init +#undef mtype_variant +#undef mtype_data_match + +#undef HKEY + +#define mtype_data_equal TOKEN(MTYPE, _data_equal) +#ifdef IP_SET_HASH_WITH_NETS +#define mtype_do_data_match TOKEN(MTYPE, _do_data_match) +#else +#define mtype_do_data_match(d) 1 +#endif +#define mtype_data_set_flags TOKEN(MTYPE, _data_set_flags) +#define mtype_data_reset_flags TOKEN(MTYPE, _data_reset_flags) +#define mtype_data_netmask TOKEN(MTYPE, _data_netmask) +#define mtype_data_list TOKEN(MTYPE, _data_list) +#define mtype_data_next TOKEN(MTYPE, _data_next) +#define mtype_elem TOKEN(MTYPE, _elem) +#define mtype_add_cidr TOKEN(MTYPE, _add_cidr) +#define mtype_del_cidr TOKEN(MTYPE, _del_cidr) +#define mtype_ahash_memsize TOKEN(MTYPE, _ahash_memsize) +#define mtype_flush TOKEN(MTYPE, _flush) +#define mtype_destroy TOKEN(MTYPE, _destroy) +#define mtype_gc_init TOKEN(MTYPE, _gc_init) +#define mtype_same_set TOKEN(MTYPE, _same_set) +#define mtype_kadt TOKEN(MTYPE, _kadt) +#define mtype_uadt TOKEN(MTYPE, _uadt) +#define mtype MTYPE + +#define mtype_elem TOKEN(MTYPE, _elem) +#define mtype_add TOKEN(MTYPE, _add) +#define mtype_del TOKEN(MTYPE, _del) +#define mtype_test_cidrs TOKEN(MTYPE, _test_cidrs) +#define mtype_test TOKEN(MTYPE, _test) +#define mtype_expire TOKEN(MTYPE, _expire) +#define mtype_resize TOKEN(MTYPE, _resize) +#define mtype_head TOKEN(MTYPE, _head) +#define mtype_list TOKEN(MTYPE, _list) +#define mtype_gc TOKEN(MTYPE, _gc) +#define mtype_variant TOKEN(MTYPE, _variant) +#define mtype_data_match TOKEN(MTYPE, _data_match) + +#ifndef HKEY_DATALEN +#define HKEY_DATALEN sizeof(struct mtype_elem) +#endif + +#define HKEY(data, initval, htable_bits) \ +(jhash2((u32 *)(data), HKEY_DATALEN/sizeof(u32), initval) \ + & jhash_mask(htable_bits)) + +#ifndef htype +#define htype HTYPE + +/* The generic hash structure */ +struct htype { + struct htable *table; /* the hash table */ + u32 maxelem; /* max elements in the hash */ + u32 elements; /* current element (vs timeout) */ + u32 initval; /* random jhash init value */ + u32 timeout; /* timeout value, if enabled */ + size_t dsize; /* data struct size */ + size_t offset[IPSET_OFFSET_MAX]; /* Offsets to extensions */ + struct timer_list gc; /* garbage collection when timeout enabled */ + struct mtype_elem next; /* temporary storage for uadd */ +#ifdef IP_SET_HASH_WITH_MULTI + u8 ahash_max; /* max elements in an array block */ +#endif +#ifdef IP_SET_HASH_WITH_NETMASK + u8 netmask; /* netmask value for subnets to store */ +#endif +#ifdef IP_SET_HASH_WITH_RBTREE + struct rb_root rbtree; +#endif +#ifdef IP_SET_HASH_WITH_NETS + struct net_prefixes nets[0]; /* book-keeping of prefixes */ +#endif +}; +#endif + +#ifdef IP_SET_HASH_WITH_NETS +/* Network cidr size book keeping when the hash stores different + * sized networks */ +static void +mtype_add_cidr(struct htype *h, u8 cidr, u8 nets_length) +{ + int i, j; + + /* Add in increasing prefix order, so larger cidr first */ + for (i = 0, j = -1; i < nets_length && h->nets[i].nets; i++) { + if (j != -1) + continue; + else if (h->nets[i].cidr < cidr) + j = i; + else if (h->nets[i].cidr == cidr) { + h->nets[i].nets++; + return; + } + } + if (j != -1) { + for (; i > j; i--) { + h->nets[i].cidr = h->nets[i - 1].cidr; + h->nets[i].nets = h->nets[i - 1].nets; + } + } + h->nets[i].cidr = cidr; + h->nets[i].nets = 1; +} + +static void +mtype_del_cidr(struct htype *h, u8 cidr, u8 nets_length) +{ + u8 i, j; + + for (i = 0; i < nets_length - 1 && h->nets[i].cidr != cidr; i++) + ; + h->nets[i].nets--; + + if (h->nets[i].nets != 0) + return; + + for (j = i; j < nets_length - 1 && h->nets[j].nets; j++) { + h->nets[j].cidr = h->nets[j + 1].cidr; + h->nets[j].nets = h->nets[j + 1].nets; + } +} +#endif + +/* Calculate the actual memory size of the set data */ +static size_t +mtype_ahash_memsize(const struct htype *h, u8 nets_length) +{ + u32 i; + struct htable *t = h->table; + size_t memsize = sizeof(*h) + + sizeof(*t) +#ifdef IP_SET_HASH_WITH_NETS + + sizeof(struct net_prefixes) * nets_length +#endif + + jhash_size(t->htable_bits) * sizeof(struct hbucket); + + for (i = 0; i < jhash_size(t->htable_bits); i++) + memsize += t->bucket[i].size * h->dsize; + + return memsize; +} + +/* Flush a hash type of set: destroy all elements */ +static void +mtype_flush(struct ip_set *set) +{ + struct htype *h = set->data; + struct htable *t = h->table; + struct hbucket *n; + u32 i; + + for (i = 0; i < jhash_size(t->htable_bits); i++) { + n = hbucket(t, i); + if (n->size) { + n->size = n->pos = 0; + /* FIXME: use slab cache */ + kfree(n->value); + } + } +#ifdef IP_SET_HASH_WITH_NETS + memset(h->nets, 0, sizeof(struct net_prefixes) + * NETS_LENGTH(set->family)); +#endif + h->elements = 0; +} + +/* Destroy a hash type of set */ +static void +mtype_destroy(struct ip_set *set) +{ + struct htype *h = set->data; + + if (set->extensions & IPSET_EXT_TIMEOUT) + del_timer_sync(&h->gc); + + ahash_destroy(h->table); +#ifdef IP_SET_HASH_WITH_RBTREE + rbtree_destroy(&h->rbtree); +#endif + kfree(h); + + set->data = NULL; +} + +static void +mtype_gc_init(struct ip_set *set, void (*gc)(unsigned long ul_set)) +{ + struct htype *h = set->data; + + init_timer(&h->gc); + h->gc.data = (unsigned long) set; + h->gc.function = gc; + h->gc.expires = jiffies + IPSET_GC_PERIOD(h->timeout) * HZ; + add_timer(&h->gc); + pr_debug("gc initialized, run in every %u\n", + IPSET_GC_PERIOD(h->timeout)); +} + +static bool +mtype_same_set(const struct ip_set *a, const struct ip_set *b) +{ + const struct htype *x = a->data; + const struct htype *y = b->data; + + /* Resizing changes htable_bits, so we ignore it */ + return x->maxelem == y->maxelem && + x->timeout == y->timeout && +#ifdef IP_SET_HASH_WITH_NETMASK + x->netmask == y->netmask && +#endif + a->extensions == b->extensions; +} + +/* Get the ith element from the array block n */ +#define ahash_data(n, i, dsize) \ + ((struct mtype_elem *)((n)->value + ((i) * (dsize)))) + +/* Delete expired elements from the hashtable */ +static void +mtype_expire(struct htype *h, u8 nets_length, size_t dsize) +{ + struct htable *t = h->table; + struct hbucket *n; + struct mtype_elem *data; + u32 i; + int j; + + for (i = 0; i < jhash_size(t->htable_bits); i++) { + n = hbucket(t, i); + for (j = 0; j < n->pos; j++) { + data = ahash_data(n, j, dsize); + if (ip_set_timeout_expired(ext_timeout(data, h))) { + pr_debug("expired %u/%u\n", i, j); +#ifdef IP_SET_HASH_WITH_NETS + mtype_del_cidr(h, CIDR(data->cidr), + nets_length); +#endif + if (j != n->pos - 1) + /* Not last one */ + memcpy(data, + ahash_data(n, n->pos - 1, dsize), + dsize); + n->pos--; + h->elements--; + } + } + if (n->pos + AHASH_INIT_SIZE < n->size) { + void *tmp = kzalloc((n->size - AHASH_INIT_SIZE) + * dsize, + GFP_ATOMIC); + if (!tmp) + /* Still try to delete expired elements */ + continue; + n->size -= AHASH_INIT_SIZE; + memcpy(tmp, n->value, n->size * dsize); + kfree(n->value); + n->value = tmp; + } + } +} + +static void +mtype_gc(unsigned long ul_set) +{ + struct ip_set *set = (struct ip_set *) ul_set; + struct htype *h = set->data; + + pr_debug("called\n"); + write_lock_bh(&set->lock); + mtype_expire(h, NETS_LENGTH(set->family), h->dsize); + write_unlock_bh(&set->lock); + + h->gc.expires = jiffies + IPSET_GC_PERIOD(h->timeout) * HZ; + add_timer(&h->gc); +} + +/* Resize a hash: create a new hash table with doubling the hashsize + * and inserting the elements to it. Repeat until we succeed or + * fail due to memory pressures. */ +static int +mtype_resize(struct ip_set *set, bool retried) +{ + struct htype *h = set->data; + struct htable *t, *orig = h->table; + u8 htable_bits = orig->htable_bits; +#ifdef IP_SET_HASH_WITH_NETS + u8 flags; +#endif + struct mtype_elem *data; + struct mtype_elem *d; + struct hbucket *n, *m; + u32 i, j; + int ret; + + /* Try to cleanup once */ + if (SET_WITH_TIMEOUT(set) && !retried) { + i = h->elements; + write_lock_bh(&set->lock); + mtype_expire(set->data, NETS_LENGTH(set->family), + h->dsize); + write_unlock_bh(&set->lock); + if (h->elements < i) + return 0; + } + +retry: + ret = 0; + htable_bits++; + pr_debug("attempt to resize set %s from %u to %u, t %p\n", + set->name, orig->htable_bits, htable_bits, orig); + if (!htable_bits) { + /* In case we have plenty of memory :-) */ + pr_warning("Cannot increase the hashsize of set %s further\n", + set->name); + return -IPSET_ERR_HASH_FULL; + } + t = ip_set_alloc(sizeof(*t) + + jhash_size(htable_bits) * sizeof(struct hbucket)); + if (!t) + return -ENOMEM; + t->htable_bits = htable_bits; + + read_lock_bh(&set->lock); + for (i = 0; i < jhash_size(orig->htable_bits); i++) { + n = hbucket(orig, i); + for (j = 0; j < n->pos; j++) { + data = ahash_data(n, j, h->dsize); +#ifdef IP_SET_HASH_WITH_NETS + flags = 0; + mtype_data_reset_flags(data, &flags); +#endif + m = hbucket(t, HKEY(data, h->initval, htable_bits)); + ret = hbucket_elem_add(m, AHASH_MAX(h), h->dsize); + if (ret < 0) { +#ifdef IP_SET_HASH_WITH_NETS + mtype_data_reset_flags(data, &flags); +#endif + read_unlock_bh(&set->lock); + ahash_destroy(t); + if (ret == -EAGAIN) + goto retry; + return ret; + } + d = ahash_data(m, m->pos++, h->dsize); + memcpy(d, data, h->dsize); +#ifdef IP_SET_HASH_WITH_NETS + mtype_data_reset_flags(d, &flags); +#endif + } + } + + rcu_assign_pointer(h->table, t); + read_unlock_bh(&set->lock); + + /* Give time to other readers of the set */ + synchronize_rcu_bh(); + + pr_debug("set %s resized from %u (%p) to %u (%p)\n", set->name, + orig->htable_bits, orig, t->htable_bits, t); + ahash_destroy(orig); + + return 0; +} + +/* Add an element to a hash and update the internal counters when succeeded, + * otherwise report the proper error code. */ +static int +mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext, + struct ip_set_ext *mext, u32 flags) +{ + struct htype *h = set->data; + struct htable *t; + const struct mtype_elem *d = value; + struct mtype_elem *data; + struct hbucket *n; + int i, ret = 0; + int j = AHASH_MAX(h) + 1; + bool flag_exist = flags & IPSET_FLAG_EXIST; + u32 key, multi = 0; + + if (SET_WITH_TIMEOUT(set) && h->elements >= h->maxelem) + /* FIXME: when set is full, we slow down here */ + mtype_expire(h, NETS_LENGTH(set->family), h->dsize); + + if (h->elements >= h->maxelem) { + if (net_ratelimit()) + pr_warning("Set %s is full, maxelem %u reached\n", + set->name, h->maxelem); + return -IPSET_ERR_HASH_FULL; + } + + rcu_read_lock_bh(); + t = rcu_dereference_bh(h->table); + key = HKEY(value, h->initval, t->htable_bits); + n = hbucket(t, key); + for (i = 0; i < n->pos; i++) { + data = ahash_data(n, i, h->dsize); + if (mtype_data_equal(data, d, &multi)) { + if (flag_exist || + (SET_WITH_TIMEOUT(set) && + ip_set_timeout_expired(ext_timeout(data, h)))) { + /* Just the extensions could be overwritten */ + j = i; + goto reuse_slot; + } else { + ret = -IPSET_ERR_EXIST; + goto out; + } + } + /* Reuse first timed out entry */ + if (SET_WITH_TIMEOUT(set) && + ip_set_timeout_expired(ext_timeout(data, h)) && + j != AHASH_MAX(h) + 1) + j = i; + } +reuse_slot: + if (j != AHASH_MAX(h) + 1) { + /* Fill out reused slot */ + data = ahash_data(n, j, h->dsize); +#ifdef IP_SET_HASH_WITH_NETS + mtype_del_cidr(h, CIDR(data->cidr), NETS_LENGTH(set->family)); + mtype_add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family)); +#endif + } else { + /* Use/create a new slot */ + TUNE_AHASH_MAX(h, multi); + ret = hbucket_elem_add(n, AHASH_MAX(h), h->dsize); + if (ret != 0) { + if (ret == -EAGAIN) + mtype_data_next(&h->next, d); + goto out; + } + data = ahash_data(n, n->pos++, h->dsize); +#ifdef IP_SET_HASH_WITH_NETS + mtype_add_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family)); +#endif + h->elements++; + } + memcpy(data, d, sizeof(struct mtype_elem)); +#ifdef IP_SET_HASH_WITH_NETS + mtype_data_set_flags(data, flags); +#endif + if (SET_WITH_TIMEOUT(set)) + ip_set_timeout_set(ext_timeout(data, h), ext->timeout); + +out: + rcu_read_unlock_bh(); + return ret; +} + +/* Delete an element from the hash: swap it with the last element + * and free up space if possible. + */ +static int +mtype_del(struct ip_set *set, void *value, const struct ip_set_ext *ext, + struct ip_set_ext *mext, u32 flags) +{ + struct htype *h = set->data; + struct htable *t = h->table; + const struct mtype_elem *d = value; + struct mtype_elem *data; + struct hbucket *n; + int i; + u32 key, multi = 0; + + key = HKEY(value, h->initval, t->htable_bits); + n = hbucket(t, key); + for (i = 0; i < n->pos; i++) { + data = ahash_data(n, i, h->dsize); + if (!mtype_data_equal(data, d, &multi)) + continue; + if (SET_WITH_TIMEOUT(set) && + ip_set_timeout_expired(ext_timeout(data, h))) + return -IPSET_ERR_EXIST; + if (i != n->pos - 1) + /* Not last one */ + memcpy(data, ahash_data(n, n->pos - 1, h->dsize), + h->dsize); + + n->pos--; + h->elements--; +#ifdef IP_SET_HASH_WITH_NETS + mtype_del_cidr(h, CIDR(d->cidr), NETS_LENGTH(set->family)); +#endif + if (n->pos + AHASH_INIT_SIZE < n->size) { + void *tmp = kzalloc((n->size - AHASH_INIT_SIZE) + * h->dsize, + GFP_ATOMIC); + if (!tmp) + return 0; + n->size -= AHASH_INIT_SIZE; + memcpy(tmp, n->value, n->size * h->dsize); + kfree(n->value); + n->value = tmp; + } + return 0; + } + + return -IPSET_ERR_EXIST; +} + +static inline int +mtype_data_match(struct mtype_elem *data, const struct ip_set_ext *ext, + struct ip_set_ext *mext, struct ip_set *set, u32 flags) +{ + return mtype_do_data_match(data); +} + +#ifdef IP_SET_HASH_WITH_NETS +/* Special test function which takes into account the different network + * sizes added to the set */ +static int +mtype_test_cidrs(struct ip_set *set, struct mtype_elem *d, + const struct ip_set_ext *ext, + struct ip_set_ext *mext, u32 flags) +{ + struct htype *h = set->data; + struct htable *t = h->table; + struct hbucket *n; + struct mtype_elem *data; + int i, j = 0; + u32 key, multi = 0; + u8 nets_length = NETS_LENGTH(set->family); + + pr_debug("test by nets\n"); + for (; j < nets_length && h->nets[j].nets && !multi; j++) { + mtype_data_netmask(d, h->nets[j].cidr); + key = HKEY(d, h->initval, t->htable_bits); + n = hbucket(t, key); + for (i = 0; i < n->pos; i++) { + data = ahash_data(n, i, h->dsize); + if (!mtype_data_equal(data, d, &multi)) + continue; + if (SET_WITH_TIMEOUT(set)) { + if (!ip_set_timeout_expired( + ext_timeout(data, h))) + return mtype_data_match(data, ext, + mext, set, + flags); +#ifdef IP_SET_HASH_WITH_MULTI + multi = 0; +#endif + } else + return mtype_data_match(data, ext, + mext, set, flags); + } + } + return 0; +} +#endif + +/* Test whether the element is added to the set */ +static int +mtype_test(struct ip_set *set, void *value, const struct ip_set_ext *ext, + struct ip_set_ext *mext, u32 flags) +{ + struct htype *h = set->data; + struct htable *t = h->table; + struct mtype_elem *d = value; + struct hbucket *n; + struct mtype_elem *data; + int i; + u32 key, multi = 0; + +#ifdef IP_SET_HASH_WITH_NETS + /* If we test an IP address and not a network address, + * try all possible network sizes */ + if (CIDR(d->cidr) == SET_HOST_MASK(set->family)) + return mtype_test_cidrs(set, d, ext, mext, flags); +#endif + + key = HKEY(d, h->initval, t->htable_bits); + n = hbucket(t, key); + for (i = 0; i < n->pos; i++) { + data = ahash_data(n, i, h->dsize); + if (mtype_data_equal(data, d, &multi) && + !(SET_WITH_TIMEOUT(set) && + ip_set_timeout_expired(ext_timeout(data, h)))) + return mtype_data_match(data, ext, mext, set, flags); + } + return 0; +} + +/* Reply a HEADER request: fill out the header part of the set */ +static int +mtype_head(struct ip_set *set, struct sk_buff *skb) +{ + const struct htype *h = set->data; + struct nlattr *nested; + size_t memsize; + + read_lock_bh(&set->lock); + memsize = mtype_ahash_memsize(h, NETS_LENGTH(set->family)); + read_unlock_bh(&set->lock); + + nested = ipset_nest_start(skb, IPSET_ATTR_DATA); + if (!nested) + goto nla_put_failure; + if (nla_put_net32(skb, IPSET_ATTR_HASHSIZE, + htonl(jhash_size(h->table->htable_bits))) || + nla_put_net32(skb, IPSET_ATTR_MAXELEM, htonl(h->maxelem))) + goto nla_put_failure; +#ifdef IP_SET_HASH_WITH_NETMASK + if (h->netmask != HOST_MASK && + nla_put_u8(skb, IPSET_ATTR_NETMASK, h->netmask)) + goto nla_put_failure; +#endif + if (nla_put_net32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1)) || + nla_put_net32(skb, IPSET_ATTR_MEMSIZE, htonl(memsize)) || + ((set->extensions & IPSET_EXT_TIMEOUT) && + nla_put_net32(skb, IPSET_ATTR_TIMEOUT, htonl(h->timeout)))) + goto nla_put_failure; + ipset_nest_end(skb, nested); + + return 0; +nla_put_failure: + return -EMSGSIZE; +} + +/* Reply a LIST/SAVE request: dump the elements of the specified set */ +static int +mtype_list(const struct ip_set *set, + struct sk_buff *skb, struct netlink_callback *cb) +{ + const struct htype *h = set->data; + const struct htable *t = h->table; + struct nlattr *atd, *nested; + const struct hbucket *n; + const struct mtype_elem *e; + u32 first = cb->args[2]; + /* We assume that one hash bucket fills into one page */ + void *incomplete; + int i; + + atd = ipset_nest_start(skb, IPSET_ATTR_ADT); + if (!atd) + return -EMSGSIZE; + pr_debug("list hash set %s\n", set->name); + for (; cb->args[2] < jhash_size(t->htable_bits); cb->args[2]++) { + incomplete = skb_tail_pointer(skb); + n = hbucket(t, cb->args[2]); + pr_debug("cb->args[2]: %lu, t %p n %p\n", cb->args[2], t, n); + for (i = 0; i < n->pos; i++) { + e = ahash_data(n, i, h->dsize); + if (SET_WITH_TIMEOUT(set) && + ip_set_timeout_expired(ext_timeout(e, h))) + continue; + pr_debug("list hash %lu hbucket %p i %u, data %p\n", + cb->args[2], n, i, e); + nested = ipset_nest_start(skb, IPSET_ATTR_DATA); + if (!nested) { + if (cb->args[2] == first) { + nla_nest_cancel(skb, atd); + return -EMSGSIZE; + } else + goto nla_put_failure; + } + if (mtype_data_list(skb, e)) + goto nla_put_failure; + if (SET_WITH_TIMEOUT(set) && + nla_put_net32(skb, IPSET_ATTR_TIMEOUT, + htonl(ip_set_timeout_get( + ext_timeout(e, h))))) + goto nla_put_failure; + ipset_nest_end(skb, nested); + } + } + ipset_nest_end(skb, atd); + /* Set listing finished */ + cb->args[2] = 0; + + return 0; + +nla_put_failure: + nlmsg_trim(skb, incomplete); + ipset_nest_end(skb, atd); + if (unlikely(first == cb->args[2])) { + pr_warning("Can't list set %s: one bucket does not fit into " + "a message. Please report it!\n", set->name); + cb->args[2] = 0; + return -EMSGSIZE; + } + return 0; +} + +static int +TOKEN(MTYPE, _kadt)(struct ip_set *set, const struct sk_buff *skb, + const struct xt_action_param *par, + enum ipset_adt adt, struct ip_set_adt_opt *opt); + +static int +TOKEN(MTYPE, _uadt)(struct ip_set *set, struct nlattr *tb[], + enum ipset_adt adt, u32 *lineno, u32 flags, bool retried); + +static const struct ip_set_type_variant mtype_variant = { + .kadt = mtype_kadt, + .uadt = mtype_uadt, + .adt = { + [IPSET_ADD] = mtype_add, + [IPSET_DEL] = mtype_del, + [IPSET_TEST] = mtype_test, + }, + .destroy = mtype_destroy, + .flush = mtype_flush, + .head = mtype_head, + .list = mtype_list, + .resize = mtype_resize, + .same_set = mtype_same_set, +}; + +#ifdef IP_SET_EMIT_CREATE +static int +TOKEN(HTYPE, _create)(struct ip_set *set, struct nlattr *tb[], u32 flags) +{ + u32 hashsize = IPSET_DEFAULT_HASHSIZE, maxelem = IPSET_DEFAULT_MAXELEM; + u8 hbits; +#ifdef IP_SET_HASH_WITH_NETMASK + u8 netmask; +#endif + size_t hsize; + struct HTYPE *h; + + if (!(set->family == NFPROTO_IPV4 || set->family == NFPROTO_IPV6)) + return -IPSET_ERR_INVALID_FAMILY; +#ifdef IP_SET_HASH_WITH_NETMASK + netmask = set->family == NFPROTO_IPV4 ? 32 : 128; + pr_debug("Create set %s with family %s\n", + set->name, set->family == NFPROTO_IPV4 ? "inet" : "inet6"); +#endif + + if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_HASHSIZE) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_MAXELEM) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || + !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) + return -IPSET_ERR_PROTOCOL; + + if (tb[IPSET_ATTR_HASHSIZE]) { + hashsize = ip_set_get_h32(tb[IPSET_ATTR_HASHSIZE]); + if (hashsize < IPSET_MIMINAL_HASHSIZE) + hashsize = IPSET_MIMINAL_HASHSIZE; + } + + if (tb[IPSET_ATTR_MAXELEM]) + maxelem = ip_set_get_h32(tb[IPSET_ATTR_MAXELEM]); + +#ifdef IP_SET_HASH_WITH_NETMASK + if (tb[IPSET_ATTR_NETMASK]) { + netmask = nla_get_u8(tb[IPSET_ATTR_NETMASK]); + + if ((set->family == NFPROTO_IPV4 && netmask > 32) || + (set->family == NFPROTO_IPV6 && netmask > 128) || + netmask == 0) + return -IPSET_ERR_INVALID_NETMASK; + } +#endif + + hsize = sizeof(*h); +#ifdef IP_SET_HASH_WITH_NETS + hsize += sizeof(struct net_prefixes) * + (set->family == NFPROTO_IPV4 ? 32 : 128); +#endif + h = kzalloc(hsize, GFP_KERNEL); + if (!h) + return -ENOMEM; + + h->maxelem = maxelem; +#ifdef IP_SET_HASH_WITH_NETMASK + h->netmask = netmask; +#endif + get_random_bytes(&h->initval, sizeof(h->initval)); + h->timeout = IPSET_NO_TIMEOUT; + + hbits = htable_bits(hashsize); + hsize = htable_size(hbits); + if (hsize == 0) { + kfree(h); + return -ENOMEM; + } + h->table = ip_set_alloc(hsize); + if (!h->table) { + kfree(h); + return -ENOMEM; + } + h->table->htable_bits = hbits; + + set->data = h; + if (set->family == NFPROTO_IPV4) + set->variant = &TOKEN(HTYPE, 4_variant); + else + set->variant = &TOKEN(HTYPE, 6_variant); + + if (tb[IPSET_ATTR_TIMEOUT]) { + h->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); + set->extensions |= IPSET_EXT_TIMEOUT; + if (set->family == NFPROTO_IPV4) { + h->dsize = sizeof(struct TOKEN(HTYPE, 4t_elem)); + h->offset[IPSET_OFFSET_TIMEOUT] = + offsetof(struct TOKEN(HTYPE, 4t_elem), + timeout); + TOKEN(HTYPE, 4_gc_init)(set, TOKEN(HTYPE, 4_gc)); + } else { + h->dsize = sizeof(struct TOKEN(HTYPE, 6t_elem)); + h->offset[IPSET_OFFSET_TIMEOUT] = + offsetof(struct TOKEN(HTYPE, 6t_elem), + timeout); + TOKEN(HTYPE, 6_gc_init)(set, TOKEN(HTYPE, 6_gc)); + } + } else { + if (set->family == NFPROTO_IPV4) + h->dsize = sizeof(struct TOKEN(HTYPE, 4_elem)); + else + h->dsize = sizeof(struct TOKEN(HTYPE, 6_elem)); + } + + pr_debug("create %s hashsize %u (%u) maxelem %u: %p(%p)\n", + set->name, jhash_size(h->table->htable_bits), + h->table->htable_bits, h->maxelem, set->data, h->table); + + return 0; +} +#endif /* IP_SET_EMIT_CREATE */ |