#include <linux/icmpv6.h>
#include <linux/random.h>
#include <linux/jhash.h>
+#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/rawv6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
-
-int sysctl_ip6frag_high_thresh __read_mostly = 256*1024;
-int sysctl_ip6frag_low_thresh __read_mostly = 192*1024;
-
-int sysctl_ip6frag_time __read_mostly = IPV6_FRAG_TIMEOUT;
+#include <net/inet_frag.h>
struct ip6frag_skb_cb
{
struct frag_queue
{
- struct hlist_node list;
- struct list_head lru_list; /* lru list member */
+ struct inet_frag_queue q;
__be32 id; /* fragment id */
struct in6_addr saddr;
struct in6_addr daddr;
- spinlock_t lock;
- atomic_t refcnt;
- struct timer_list timer; /* expire timer */
- struct sk_buff *fragments;
- int len;
- int meat;
int iif;
- ktime_t stamp;
unsigned int csum;
- __u8 last_in; /* has first/last segment arrived? */
-#define COMPLETE 4
-#define FIRST_IN 2
-#define LAST_IN 1
__u16 nhoffset;
};
-/* Hash table. */
-
-#define IP6Q_HASHSZ 64
+struct inet_frags_ctl ip6_frags_ctl __read_mostly = {
+ .high_thresh = 256 * 1024,
+ .low_thresh = 192 * 1024,
+ .timeout = IPV6_FRAG_TIMEOUT,
+ .secret_interval = 10 * 60 * HZ,
+};
-static struct hlist_head ip6_frag_hash[IP6Q_HASHSZ];
-static DEFINE_RWLOCK(ip6_frag_lock);
-static u32 ip6_frag_hash_rnd;
-static LIST_HEAD(ip6_frag_lru_list);
-int ip6_frag_nqueues = 0;
+static struct inet_frags ip6_frags;
-static __inline__ void __fq_unlink(struct frag_queue *fq)
+int ip6_frag_nqueues(void)
{
- hlist_del(&fq->list);
- list_del(&fq->lru_list);
- ip6_frag_nqueues--;
+ return ip6_frags.nqueues;
}
-static __inline__ void fq_unlink(struct frag_queue *fq)
+int ip6_frag_mem(void)
{
- write_lock(&ip6_frag_lock);
- __fq_unlink(fq);
- write_unlock(&ip6_frag_lock);
+ return atomic_read(&ip6_frags.mem);
}
+static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
+ struct net_device *dev);
+
/*
* callers should be careful not to use the hash value outside the ipfrag_lock
* as doing so could race with ipfrag_hash_rnd being recalculated.
a += JHASH_GOLDEN_RATIO;
b += JHASH_GOLDEN_RATIO;
- c += ip6_frag_hash_rnd;
+ c += ip6_frags.rnd;
__jhash_mix(a, b, c);
a += (__force u32)saddr->s6_addr32[3];
c += (__force u32)id;
__jhash_mix(a, b, c);
- return c & (IP6Q_HASHSZ - 1);
+ return c & (INETFRAGS_HASHSZ - 1);
}
-static struct timer_list ip6_frag_secret_timer;
-int sysctl_ip6frag_secret_interval __read_mostly = 10 * 60 * HZ;
-
-static void ip6_frag_secret_rebuild(unsigned long dummy)
+static unsigned int ip6_hashfn(struct inet_frag_queue *q)
{
- unsigned long now = jiffies;
- int i;
-
- write_lock(&ip6_frag_lock);
- get_random_bytes(&ip6_frag_hash_rnd, sizeof(u32));
- for (i = 0; i < IP6Q_HASHSZ; i++) {
- struct frag_queue *q;
- struct hlist_node *p, *n;
-
- hlist_for_each_entry_safe(q, p, n, &ip6_frag_hash[i], list) {
- unsigned int hval = ip6qhashfn(q->id,
- &q->saddr,
- &q->daddr);
-
- if (hval != i) {
- hlist_del(&q->list);
-
- /* Relink to new hash chain. */
- hlist_add_head(&q->list,
- &ip6_frag_hash[hval]);
-
- }
- }
- }
- write_unlock(&ip6_frag_lock);
+ struct frag_queue *fq;
- mod_timer(&ip6_frag_secret_timer, now + sysctl_ip6frag_secret_interval);
+ fq = container_of(q, struct frag_queue, q);
+ return ip6qhashfn(fq->id, &fq->saddr, &fq->daddr);
}
-atomic_t ip6_frag_mem = ATOMIC_INIT(0);
-
/* Memory Tracking Functions. */
static inline void frag_kfree_skb(struct sk_buff *skb, int *work)
{
if (work)
*work -= skb->truesize;
- atomic_sub(skb->truesize, &ip6_frag_mem);
+ atomic_sub(skb->truesize, &ip6_frags.mem);
kfree_skb(skb);
}
-static inline void frag_free_queue(struct frag_queue *fq, int *work)
+static void ip6_frag_free(struct inet_frag_queue *fq)
{
- if (work)
- *work -= sizeof(struct frag_queue);
- atomic_sub(sizeof(struct frag_queue), &ip6_frag_mem);
- kfree(fq);
+ kfree(container_of(fq, struct frag_queue, q));
}
static inline struct frag_queue *frag_alloc_queue(void)
if(!fq)
return NULL;
- atomic_add(sizeof(struct frag_queue), &ip6_frag_mem);
+ atomic_add(sizeof(struct frag_queue), &ip6_frags.mem);
return fq;
}
/* Destruction primitives. */
-/* Complete destruction of fq. */
-static void ip6_frag_destroy(struct frag_queue *fq, int *work)
-{
- struct sk_buff *fp;
-
- BUG_TRAP(fq->last_in&COMPLETE);
- BUG_TRAP(del_timer(&fq->timer) == 0);
-
- /* Release all fragment data. */
- fp = fq->fragments;
- while (fp) {
- struct sk_buff *xp = fp->next;
-
- frag_kfree_skb(fp, work);
- fp = xp;
- }
-
- frag_free_queue(fq, work);
-}
-
-static __inline__ void fq_put(struct frag_queue *fq, int *work)
+static __inline__ void fq_put(struct frag_queue *fq)
{
- if (atomic_dec_and_test(&fq->refcnt))
- ip6_frag_destroy(fq, work);
+ inet_frag_put(&fq->q, &ip6_frags);
}
/* Kill fq entry. It is not destroyed immediately,
*/
static __inline__ void fq_kill(struct frag_queue *fq)
{
- if (del_timer(&fq->timer))
- atomic_dec(&fq->refcnt);
-
- if (!(fq->last_in & COMPLETE)) {
- fq_unlink(fq);
- atomic_dec(&fq->refcnt);
- fq->last_in |= COMPLETE;
- }
+ inet_frag_kill(&fq->q, &ip6_frags);
}
static void ip6_evictor(struct inet6_dev *idev)
{
- struct frag_queue *fq;
- struct list_head *tmp;
- int work;
-
- work = atomic_read(&ip6_frag_mem) - sysctl_ip6frag_low_thresh;
- if (work <= 0)
- return;
-
- while(work > 0) {
- read_lock(&ip6_frag_lock);
- if (list_empty(&ip6_frag_lru_list)) {
- read_unlock(&ip6_frag_lock);
- return;
- }
- tmp = ip6_frag_lru_list.next;
- fq = list_entry(tmp, struct frag_queue, lru_list);
- atomic_inc(&fq->refcnt);
- read_unlock(&ip6_frag_lock);
-
- spin_lock(&fq->lock);
- if (!(fq->last_in&COMPLETE))
- fq_kill(fq);
- spin_unlock(&fq->lock);
-
- fq_put(fq, &work);
- IP6_INC_STATS_BH(idev, IPSTATS_MIB_REASMFAILS);
- }
+ int evicted;
+
+ evicted = inet_frag_evictor(&ip6_frags);
+ if (evicted)
+ IP6_ADD_STATS_BH(idev, IPSTATS_MIB_REASMFAILS, evicted);
}
static void ip6_frag_expire(unsigned long data)
struct frag_queue *fq = (struct frag_queue *) data;
struct net_device *dev = NULL;
- spin_lock(&fq->lock);
+ spin_lock(&fq->q.lock);
- if (fq->last_in & COMPLETE)
+ if (fq->q.last_in & COMPLETE)
goto out;
fq_kill(fq);
- dev = dev_get_by_index(fq->iif);
+ dev = dev_get_by_index(&init_net, fq->iif);
if (!dev)
goto out;
rcu_read_unlock();
/* Don't send error if the first segment did not arrive. */
- if (!(fq->last_in&FIRST_IN) || !fq->fragments)
+ if (!(fq->q.last_in&FIRST_IN) || !fq->q.fragments)
goto out;
/*
segment was received. And do not use fq->dev
pointer directly, device might already disappeared.
*/
- fq->fragments->dev = dev;
- icmpv6_send(fq->fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
+ fq->q.fragments->dev = dev;
+ icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev);
out:
if (dev)
dev_put(dev);
- spin_unlock(&fq->lock);
- fq_put(fq, NULL);
+ spin_unlock(&fq->q.lock);
+ fq_put(fq);
}
/* Creation primitives. */
-static struct frag_queue *ip6_frag_intern(struct frag_queue *fq_in)
+static struct frag_queue *ip6_frag_intern(struct frag_queue *fq_in,
+ unsigned int hash)
{
struct frag_queue *fq;
- unsigned int hash;
#ifdef CONFIG_SMP
struct hlist_node *n;
#endif
- write_lock(&ip6_frag_lock);
- hash = ip6qhashfn(fq_in->id, &fq_in->saddr, &fq_in->daddr);
+ write_lock(&ip6_frags.lock);
#ifdef CONFIG_SMP
- hlist_for_each_entry(fq, n, &ip6_frag_hash[hash], list) {
+ hlist_for_each_entry(fq, n, &ip6_frags.hash[hash], q.list) {
if (fq->id == fq_in->id &&
ipv6_addr_equal(&fq_in->saddr, &fq->saddr) &&
ipv6_addr_equal(&fq_in->daddr, &fq->daddr)) {
- atomic_inc(&fq->refcnt);
- write_unlock(&ip6_frag_lock);
- fq_in->last_in |= COMPLETE;
- fq_put(fq_in, NULL);
+ atomic_inc(&fq->q.refcnt);
+ write_unlock(&ip6_frags.lock);
+ fq_in->q.last_in |= COMPLETE;
+ fq_put(fq_in);
return fq;
}
}
#endif
fq = fq_in;
- if (!mod_timer(&fq->timer, jiffies + sysctl_ip6frag_time))
- atomic_inc(&fq->refcnt);
+ if (!mod_timer(&fq->q.timer, jiffies + ip6_frags_ctl.timeout))
+ atomic_inc(&fq->q.refcnt);
- atomic_inc(&fq->refcnt);
- hlist_add_head(&fq->list, &ip6_frag_hash[hash]);
- INIT_LIST_HEAD(&fq->lru_list);
- list_add_tail(&fq->lru_list, &ip6_frag_lru_list);
- ip6_frag_nqueues++;
- write_unlock(&ip6_frag_lock);
+ atomic_inc(&fq->q.refcnt);
+ hlist_add_head(&fq->q.list, &ip6_frags.hash[hash]);
+ INIT_LIST_HEAD(&fq->q.lru_list);
+ list_add_tail(&fq->q.lru_list, &ip6_frags.lru_list);
+ ip6_frags.nqueues++;
+ write_unlock(&ip6_frags.lock);
return fq;
}
static struct frag_queue *
ip6_frag_create(__be32 id, struct in6_addr *src, struct in6_addr *dst,
- struct inet6_dev *idev)
+ struct inet6_dev *idev, unsigned int hash)
{
struct frag_queue *fq;
ipv6_addr_copy(&fq->saddr, src);
ipv6_addr_copy(&fq->daddr, dst);
- init_timer(&fq->timer);
- fq->timer.function = ip6_frag_expire;
- fq->timer.data = (long) fq;
- spin_lock_init(&fq->lock);
- atomic_set(&fq->refcnt, 1);
+ init_timer(&fq->q.timer);
+ fq->q.timer.function = ip6_frag_expire;
+ fq->q.timer.data = (long) fq;
+ spin_lock_init(&fq->q.lock);
+ atomic_set(&fq->q.refcnt, 1);
- return ip6_frag_intern(fq);
+ return ip6_frag_intern(fq, hash);
oom:
IP6_INC_STATS_BH(idev, IPSTATS_MIB_REASMFAILS);
struct hlist_node *n;
unsigned int hash;
- read_lock(&ip6_frag_lock);
+ read_lock(&ip6_frags.lock);
hash = ip6qhashfn(id, src, dst);
- hlist_for_each_entry(fq, n, &ip6_frag_hash[hash], list) {
+ hlist_for_each_entry(fq, n, &ip6_frags.hash[hash], q.list) {
if (fq->id == id &&
ipv6_addr_equal(src, &fq->saddr) &&
ipv6_addr_equal(dst, &fq->daddr)) {
- atomic_inc(&fq->refcnt);
- read_unlock(&ip6_frag_lock);
+ atomic_inc(&fq->q.refcnt);
+ read_unlock(&ip6_frags.lock);
return fq;
}
}
- read_unlock(&ip6_frag_lock);
+ read_unlock(&ip6_frags.lock);
- return ip6_frag_create(id, src, dst, idev);
+ return ip6_frag_create(id, src, dst, idev, hash);
}
-static void ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
+static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
struct frag_hdr *fhdr, int nhoff)
{
struct sk_buff *prev, *next;
+ struct net_device *dev;
int offset, end;
- if (fq->last_in & COMPLETE)
+ if (fq->q.last_in & COMPLETE)
goto err;
offset = ntohs(fhdr->frag_off) & ~0x7;
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
((u8 *)&fhdr->frag_off -
skb_network_header(skb)));
- return;
+ return -1;
}
if (skb->ip_summed == CHECKSUM_COMPLETE) {
/* If we already have some bits beyond end
* or have different end, the segment is corrupted.
*/
- if (end < fq->len ||
- ((fq->last_in & LAST_IN) && end != fq->len))
+ if (end < fq->q.len ||
+ ((fq->q.last_in & LAST_IN) && end != fq->q.len))
goto err;
- fq->last_in |= LAST_IN;
- fq->len = end;
+ fq->q.last_in |= LAST_IN;
+ fq->q.len = end;
} else {
/* Check if the fragment is rounded to 8 bytes.
* Required by the RFC.
IPSTATS_MIB_INHDRERRORS);
icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
offsetof(struct ipv6hdr, payload_len));
- return;
+ return -1;
}
- if (end > fq->len) {
+ if (end > fq->q.len) {
/* Some bits beyond end -> corruption. */
- if (fq->last_in & LAST_IN)
+ if (fq->q.last_in & LAST_IN)
goto err;
- fq->len = end;
+ fq->q.len = end;
}
}
* this fragment, right?
*/
prev = NULL;
- for(next = fq->fragments; next != NULL; next = next->next) {
+ for(next = fq->q.fragments; next != NULL; next = next->next) {
if (FRAG6_CB(next)->offset >= offset)
break; /* bingo! */
prev = next;
if (!pskb_pull(next, i))
goto err;
FRAG6_CB(next)->offset += i; /* next fragment */
- fq->meat -= i;
+ fq->q.meat -= i;
if (next->ip_summed != CHECKSUM_UNNECESSARY)
next->ip_summed = CHECKSUM_NONE;
break;
if (prev)
prev->next = next;
else
- fq->fragments = next;
+ fq->q.fragments = next;
- fq->meat -= free_it->len;
+ fq->q.meat -= free_it->len;
frag_kfree_skb(free_it, NULL);
}
}
if (prev)
prev->next = skb;
else
- fq->fragments = skb;
+ fq->q.fragments = skb;
- if (skb->dev)
- fq->iif = skb->dev->ifindex;
- skb->dev = NULL;
- fq->stamp = skb->tstamp;
- fq->meat += skb->len;
- atomic_add(skb->truesize, &ip6_frag_mem);
+ dev = skb->dev;
+ if (dev) {
+ fq->iif = dev->ifindex;
+ skb->dev = NULL;
+ }
+ fq->q.stamp = skb->tstamp;
+ fq->q.meat += skb->len;
+ atomic_add(skb->truesize, &ip6_frags.mem);
/* The first fragment.
* nhoffset is obtained from the first fragment, of course.
*/
if (offset == 0) {
fq->nhoffset = nhoff;
- fq->last_in |= FIRST_IN;
+ fq->q.last_in |= FIRST_IN;
}
- write_lock(&ip6_frag_lock);
- list_move_tail(&fq->lru_list, &ip6_frag_lru_list);
- write_unlock(&ip6_frag_lock);
- return;
+
+ if (fq->q.last_in == (FIRST_IN | LAST_IN) && fq->q.meat == fq->q.len)
+ return ip6_frag_reasm(fq, prev, dev);
+
+ write_lock(&ip6_frags.lock);
+ list_move_tail(&fq->q.lru_list, &ip6_frags.lru_list);
+ write_unlock(&ip6_frags.lock);
+ return -1;
err:
IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_REASMFAILS);
kfree_skb(skb);
+ return -1;
}
/*
* queue is eligible for reassembly i.e. it is not COMPLETE,
* the last and the first frames arrived and all the bits are here.
*/
-static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff **skb_in,
+static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev,
struct net_device *dev)
{
- struct sk_buff *fp, *head = fq->fragments;
+ struct sk_buff *fp, *head = fq->q.fragments;
int payload_len;
unsigned int nhoff;
fq_kill(fq);
+ /* Make the one we just received the head. */
+ if (prev) {
+ head = prev->next;
+ fp = skb_clone(head, GFP_ATOMIC);
+
+ if (!fp)
+ goto out_oom;
+
+ fp->next = head->next;
+ prev->next = fp;
+
+ skb_morph(head, fq->q.fragments);
+ head->next = fq->q.fragments->next;
+
+ kfree_skb(fq->q.fragments);
+ fq->q.fragments = head;
+ }
+
BUG_TRAP(head != NULL);
BUG_TRAP(FRAG6_CB(head)->offset == 0);
/* Unfragmented part is taken from the first segment. */
payload_len = ((head->data - skb_network_header(head)) -
- sizeof(struct ipv6hdr) + fq->len -
+ sizeof(struct ipv6hdr) + fq->q.len -
sizeof(struct frag_hdr));
if (payload_len > IPV6_MAXPLEN)
goto out_oversize;
head->len -= clone->len;
clone->csum = 0;
clone->ip_summed = head->ip_summed;
- atomic_add(clone->truesize, &ip6_frag_mem);
+ atomic_add(clone->truesize, &ip6_frags.mem);
}
/* We have to remove fragment header from datagram and to relocate
skb_shinfo(head)->frag_list = head->next;
skb_reset_transport_header(head);
skb_push(head, head->data - skb_network_header(head));
- atomic_sub(head->truesize, &ip6_frag_mem);
+ atomic_sub(head->truesize, &ip6_frags.mem);
for (fp=head->next; fp; fp = fp->next) {
head->data_len += fp->len;
else if (head->ip_summed == CHECKSUM_COMPLETE)
head->csum = csum_add(head->csum, fp->csum);
head->truesize += fp->truesize;
- atomic_sub(fp->truesize, &ip6_frag_mem);
+ atomic_sub(fp->truesize, &ip6_frags.mem);
}
head->next = NULL;
head->dev = dev;
- head->tstamp = fq->stamp;
+ head->tstamp = fq->q.stamp;
ipv6_hdr(head)->payload_len = htons(payload_len);
IP6CB(head)->nhoff = nhoff;
- *skb_in = head;
-
/* Yes, and fold redundant checksum back. 8) */
if (head->ip_summed == CHECKSUM_COMPLETE)
head->csum = csum_partial(skb_network_header(head),
rcu_read_lock();
IP6_INC_STATS_BH(__in6_dev_get(dev), IPSTATS_MIB_REASMOKS);
rcu_read_unlock();
- fq->fragments = NULL;
+ fq->q.fragments = NULL;
return 1;
out_oversize:
return -1;
}
-static int ipv6_frag_rcv(struct sk_buff **skbp)
+static int ipv6_frag_rcv(struct sk_buff *skb)
{
- struct sk_buff *skb = *skbp;
- struct net_device *dev = skb->dev;
struct frag_hdr *fhdr;
struct frag_queue *fq;
struct ipv6hdr *hdr = ipv6_hdr(skb);
return 1;
}
- if (atomic_read(&ip6_frag_mem) > sysctl_ip6frag_high_thresh)
+ if (atomic_read(&ip6_frags.mem) > ip6_frags_ctl.high_thresh)
ip6_evictor(ip6_dst_idev(skb->dst));
if ((fq = fq_find(fhdr->identification, &hdr->saddr, &hdr->daddr,
ip6_dst_idev(skb->dst))) != NULL) {
- int ret = -1;
-
- spin_lock(&fq->lock);
+ int ret;
- ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
+ spin_lock(&fq->q.lock);
- if (fq->last_in == (FIRST_IN|LAST_IN) &&
- fq->meat == fq->len)
- ret = ip6_frag_reasm(fq, skbp, dev);
+ ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff);
- spin_unlock(&fq->lock);
- fq_put(fq, NULL);
+ spin_unlock(&fq->q.lock);
+ fq_put(fq);
return ret;
}
if (inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT) < 0)
printk(KERN_ERR "ipv6_frag_init: Could not register protocol\n");
- ip6_frag_hash_rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
- (jiffies ^ (jiffies >> 6)));
-
- init_timer(&ip6_frag_secret_timer);
- ip6_frag_secret_timer.function = ip6_frag_secret_rebuild;
- ip6_frag_secret_timer.expires = jiffies + sysctl_ip6frag_secret_interval;
- add_timer(&ip6_frag_secret_timer);
+ ip6_frags.ctl = &ip6_frags_ctl;
+ ip6_frags.hashfn = ip6_hashfn;
+ ip6_frags.destructor = ip6_frag_free;
+ ip6_frags.skb_free = NULL;
+ ip6_frags.qsize = sizeof(struct frag_queue);
+ inet_frags_init(&ip6_frags);
}
git.openpandora.org / pandora-kernel.git / blobdiff