diff options
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/Makefile | 3 | ||||
| -rw-r--r-- | net/ipv4/inet_fragment.c | 44 | ||||
| -rw-r--r-- | net/ipv4/ip_fragment.c | 109 | ||||
| -rw-r--r-- | net/ipv4/proc.c | 4 |
4 files changed, 101 insertions, 59 deletions
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile index a02c36d..93fe396 100644 --- a/net/ipv4/Makefile +++ b/net/ipv4/Makefile @@ -10,7 +10,8 @@ obj-y := route.o inetpeer.o protocol.o \ tcp_minisocks.o tcp_cong.o \ datagram.o raw.o udp.o udplite.o \ arp.o icmp.o devinet.o af_inet.o igmp.o \ - sysctl_net_ipv4.o fib_frontend.o fib_semantics.o + sysctl_net_ipv4.o fib_frontend.o fib_semantics.o \ + inet_fragment.o obj-$(CONFIG_IP_FIB_HASH) += fib_hash.o obj-$(CONFIG_IP_FIB_TRIE) += fib_trie.o diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c new file mode 100644 index 0000000..69623ff --- /dev/null +++ b/net/ipv4/inet_fragment.c @@ -0,0 +1,44 @@ +/* + * inet fragments management + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Pavel Emelyanov <xemul@openvz.org> + * Started as consolidation of ipv4/ip_fragment.c, + * ipv6/reassembly. and ipv6 nf conntrack reassembly + */ + +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/module.h> +#include <linux/timer.h> +#include <linux/mm.h> + +#include <net/inet_frag.h> + +void inet_frags_init(struct inet_frags *f) +{ + int i; + + for (i = 0; i < INETFRAGS_HASHSZ; i++) + INIT_HLIST_HEAD(&f->hash[i]); + + INIT_LIST_HEAD(&f->lru_list); + rwlock_init(&f->lock); + + f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^ + (jiffies ^ (jiffies >> 6))); + + f->nqueues = 0; + atomic_set(&f->mem, 0); + +} +EXPORT_SYMBOL(inet_frags_init); + +void inet_frags_fini(struct inet_frags *f) +{ +} +EXPORT_SYMBOL(inet_frags_fini); diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 428eaa5..321e694 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -87,16 +87,17 @@ struct ipq { struct inet_peer *peer; }; -/* Hash table. */ +static struct inet_frags ip4_frags; -#define IPQ_HASHSZ 64 +int ip_frag_nqueues(void) +{ + return ip4_frags.nqueues; +} -/* Per-bucket lock is easy to add now. */ -static struct hlist_head ipq_hash[IPQ_HASHSZ]; -static DEFINE_RWLOCK(ipfrag_lock); -static u32 ipfrag_hash_rnd; -static LIST_HEAD(ipq_lru_list); -int ip_frag_nqueues = 0; +int ip_frag_mem(void) +{ + return atomic_read(&ip4_frags.mem); +} static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev, struct net_device *dev); @@ -105,24 +106,23 @@ static __inline__ void __ipq_unlink(struct ipq *qp) { hlist_del(&qp->q.list); list_del(&qp->q.lru_list); - ip_frag_nqueues--; + ip4_frags.nqueues--; } static __inline__ void ipq_unlink(struct ipq *ipq) { - write_lock(&ipfrag_lock); + write_lock(&ip4_frags.lock); __ipq_unlink(ipq); - write_unlock(&ipfrag_lock); + write_unlock(&ip4_frags.lock); } static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot) { return jhash_3words((__force u32)id << 16 | prot, (__force u32)saddr, (__force u32)daddr, - ipfrag_hash_rnd) & (IPQ_HASHSZ - 1); + ip4_frags.rnd) & (INETFRAGS_HASHSZ - 1); } -static struct timer_list ipfrag_secret_timer; int sysctl_ipfrag_secret_interval __read_mostly = 10 * 60 * HZ; static void ipfrag_secret_rebuild(unsigned long dummy) @@ -130,13 +130,13 @@ static void ipfrag_secret_rebuild(unsigned long dummy) unsigned long now = jiffies; int i; - write_lock(&ipfrag_lock); - get_random_bytes(&ipfrag_hash_rnd, sizeof(u32)); - for (i = 0; i < IPQ_HASHSZ; i++) { + write_lock(&ip4_frags.lock); + get_random_bytes(&ip4_frags.rnd, sizeof(u32)); + for (i = 0; i < INETFRAGS_HASHSZ; i++) { struct ipq *q; struct hlist_node *p, *n; - hlist_for_each_entry_safe(q, p, n, &ipq_hash[i], q.list) { + hlist_for_each_entry_safe(q, p, n, &ip4_frags.hash[i], q.list) { unsigned int hval = ipqhashfn(q->id, q->saddr, q->daddr, q->protocol); @@ -144,23 +144,21 @@ static void ipfrag_secret_rebuild(unsigned long dummy) hlist_del(&q->q.list); /* Relink to new hash chain. */ - hlist_add_head(&q->q.list, &ipq_hash[hval]); + hlist_add_head(&q->q.list, &ip4_frags.hash[hval]); } } } - write_unlock(&ipfrag_lock); + write_unlock(&ip4_frags.lock); - mod_timer(&ipfrag_secret_timer, now + sysctl_ipfrag_secret_interval); + mod_timer(&ip4_frags.secret_timer, now + sysctl_ipfrag_secret_interval); } -atomic_t ip_frag_mem = ATOMIC_INIT(0); /* Memory used for fragments */ - /* Memory Tracking Functions. */ static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work) { if (work) *work -= skb->truesize; - atomic_sub(skb->truesize, &ip_frag_mem); + atomic_sub(skb->truesize, &ip4_frags.mem); kfree_skb(skb); } @@ -168,7 +166,7 @@ static __inline__ void frag_free_queue(struct ipq *qp, int *work) { if (work) *work -= sizeof(struct ipq); - atomic_sub(sizeof(struct ipq), &ip_frag_mem); + atomic_sub(sizeof(struct ipq), &ip4_frags.mem); kfree(qp); } @@ -178,7 +176,7 @@ static __inline__ struct ipq *frag_alloc_queue(void) if (!qp) return NULL; - atomic_add(sizeof(struct ipq), &ip_frag_mem); + atomic_add(sizeof(struct ipq), &ip4_frags.mem); return qp; } @@ -239,20 +237,20 @@ static void ip_evictor(void) struct list_head *tmp; int work; - work = atomic_read(&ip_frag_mem) - sysctl_ipfrag_low_thresh; + work = atomic_read(&ip4_frags.mem) - sysctl_ipfrag_low_thresh; if (work <= 0) return; while (work > 0) { - read_lock(&ipfrag_lock); - if (list_empty(&ipq_lru_list)) { - read_unlock(&ipfrag_lock); + read_lock(&ip4_frags.lock); + if (list_empty(&ip4_frags.lru_list)) { + read_unlock(&ip4_frags.lock); return; } - tmp = ipq_lru_list.next; + tmp = ip4_frags.lru_list.next; qp = list_entry(tmp, struct ipq, q.lru_list); atomic_inc(&qp->q.refcnt); - read_unlock(&ipfrag_lock); + read_unlock(&ip4_frags.lock); spin_lock(&qp->q.lock); if (!(qp->q.last_in&COMPLETE)) @@ -304,7 +302,7 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in) #endif unsigned int hash; - write_lock(&ipfrag_lock); + write_lock(&ip4_frags.lock); hash = ipqhashfn(qp_in->id, qp_in->saddr, qp_in->daddr, qp_in->protocol); #ifdef CONFIG_SMP @@ -312,14 +310,14 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in) * such entry could be created on other cpu, while we * promoted read lock to write lock. */ - hlist_for_each_entry(qp, n, &ipq_hash[hash], q.list) { + hlist_for_each_entry(qp, n, &ip4_frags.hash[hash], q.list) { if (qp->id == qp_in->id && qp->saddr == qp_in->saddr && qp->daddr == qp_in->daddr && qp->protocol == qp_in->protocol && qp->user == qp_in->user) { atomic_inc(&qp->q.refcnt); - write_unlock(&ipfrag_lock); + write_unlock(&ip4_frags.lock); qp_in->q.last_in |= COMPLETE; ipq_put(qp_in, NULL); return qp; @@ -332,11 +330,11 @@ static struct ipq *ip_frag_intern(struct ipq *qp_in) atomic_inc(&qp->q.refcnt); atomic_inc(&qp->q.refcnt); - hlist_add_head(&qp->q.list, &ipq_hash[hash]); + hlist_add_head(&qp->q.list, &ip4_frags.hash[hash]); INIT_LIST_HEAD(&qp->q.lru_list); - list_add_tail(&qp->q.lru_list, &ipq_lru_list); - ip_frag_nqueues++; - write_unlock(&ipfrag_lock); + list_add_tail(&qp->q.lru_list, &ip4_frags.lru_list); + ip4_frags.nqueues++; + write_unlock(&ip4_frags.lock); return qp; } @@ -387,20 +385,20 @@ static inline struct ipq *ip_find(struct iphdr *iph, u32 user) struct ipq *qp; struct hlist_node *n; - read_lock(&ipfrag_lock); + read_lock(&ip4_frags.lock); hash = ipqhashfn(id, saddr, daddr, protocol); - hlist_for_each_entry(qp, n, &ipq_hash[hash], q.list) { + hlist_for_each_entry(qp, n, &ip4_frags.hash[hash], q.list) { if (qp->id == id && qp->saddr == saddr && qp->daddr == daddr && qp->protocol == protocol && qp->user == user) { atomic_inc(&qp->q.refcnt); - read_unlock(&ipfrag_lock); + read_unlock(&ip4_frags.lock); return qp; } } - read_unlock(&ipfrag_lock); + read_unlock(&ip4_frags.lock); return ip_frag_create(iph, user); } @@ -599,16 +597,16 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb) } qp->q.stamp = skb->tstamp; qp->q.meat += skb->len; - atomic_add(skb->truesize, &ip_frag_mem); + atomic_add(skb->truesize, &ip4_frags.mem); if (offset == 0) qp->q.last_in |= FIRST_IN; if (qp->q.last_in == (FIRST_IN | LAST_IN) && qp->q.meat == qp->q.len) return ip_frag_reasm(qp, prev, dev); - write_lock(&ipfrag_lock); - list_move_tail(&qp->q.lru_list, &ipq_lru_list); - write_unlock(&ipfrag_lock); + write_lock(&ip4_frags.lock); + list_move_tail(&qp->q.lru_list, &ip4_frags.lru_list); + write_unlock(&ip4_frags.lock); return -EINPROGRESS; err: @@ -684,12 +682,12 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev, head->len -= clone->len; clone->csum = 0; clone->ip_summed = head->ip_summed; - atomic_add(clone->truesize, &ip_frag_mem); + atomic_add(clone->truesize, &ip4_frags.mem); } skb_shinfo(head)->frag_list = head->next; skb_push(head, head->data - skb_network_header(head)); - atomic_sub(head->truesize, &ip_frag_mem); + atomic_sub(head->truesize, &ip4_frags.mem); for (fp=head->next; fp; fp = fp->next) { head->data_len += fp->len; @@ -699,7 +697,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev, else if (head->ip_summed == CHECKSUM_COMPLETE) head->csum = csum_add(head->csum, fp->csum); head->truesize += fp->truesize; - atomic_sub(fp->truesize, &ip_frag_mem); + atomic_sub(fp->truesize, &ip4_frags.mem); } head->next = NULL; @@ -735,7 +733,7 @@ int ip_defrag(struct sk_buff *skb, u32 user) IP_INC_STATS_BH(IPSTATS_MIB_REASMREQDS); /* Start by cleaning up the memory. */ - if (atomic_read(&ip_frag_mem) > sysctl_ipfrag_high_thresh) + if (atomic_read(&ip4_frags.mem) > sysctl_ipfrag_high_thresh) ip_evictor(); /* Lookup (or create) queue header */ @@ -758,13 +756,12 @@ int ip_defrag(struct sk_buff *skb, u32 user) void __init ipfrag_init(void) { - ipfrag_hash_rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^ - (jiffies ^ (jiffies >> 6))); + init_timer(&ip4_frags.secret_timer); + ip4_frags.secret_timer.function = ipfrag_secret_rebuild; + ip4_frags.secret_timer.expires = jiffies + sysctl_ipfrag_secret_interval; + add_timer(&ip4_frags.secret_timer); - init_timer(&ipfrag_secret_timer); - ipfrag_secret_timer.function = ipfrag_secret_rebuild; - ipfrag_secret_timer.expires = jiffies + sysctl_ipfrag_secret_interval; - add_timer(&ipfrag_secret_timer); + inet_frags_init(&ip4_frags); } EXPORT_SYMBOL(ip_defrag); diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index e5b05b0..fd16cb8 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -70,8 +70,8 @@ static int sockstat_seq_show(struct seq_file *seq, void *v) seq_printf(seq, "UDP: inuse %d\n", fold_prot_inuse(&udp_prot)); seq_printf(seq, "UDPLITE: inuse %d\n", fold_prot_inuse(&udplite_prot)); seq_printf(seq, "RAW: inuse %d\n", fold_prot_inuse(&raw_prot)); - seq_printf(seq, "FRAG: inuse %d memory %d\n", ip_frag_nqueues, - atomic_read(&ip_frag_mem)); + seq_printf(seq, "FRAG: inuse %d memory %d\n", + ip_frag_nqueues(), ip_frag_mem()); return 0; } |
