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net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT

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Used to track skbs freed after a timeout happened
in a reassmbly unit.

Passing a @reason argument to inet_frag_rbtree_purge()
allows to use correct consumed status for frags
that have been successfully re-assembled.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2022-10-29 15:45:19 +00:00 committed by Jakub Kicinski
parent 4ecbb1c27c
commit 77adfd3a1d
5 changed files with 24 additions and 8 deletions
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3
include/net/dropreason.h
View File

@ -69,6 +69,7 @@
FN(IP_INNOROUTES) \
FN(PKT_TOO_BIG) \
FN(DUP_FRAG) \
FN(FRAG_REASM_TIMEOUT) \
FNe(MAX)
/**
@ -303,6 +304,8 @@ enum skb_drop_reason {
SKB_DROP_REASON_PKT_TOO_BIG,
/** @SKB_DROP_REASON_DUP_FRAG: duplicate fragment */
SKB_DROP_REASON_DUP_FRAG,
/** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
/**
* @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
* used as a real 'reason'

6
include/net/inet_frag.h
View File

@ -7,6 +7,7 @@
#include <linux/in6.h>
#include <linux/rbtree_types.h>
#include <linux/refcount.h>
#include <net/dropreason.h>
/* Per netns frag queues directory */
struct fqdir {
@ -34,12 +35,14 @@ struct fqdir {
* @INET_FRAG_LAST_IN: final fragment has arrived
* @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction
* @INET_FRAG_HASH_DEAD: inet_frag_kill() has not removed fq from rhashtable
* @INET_FRAG_DROP: if skbs must be dropped (instead of being consumed)
*/
enum {
INET_FRAG_FIRST_IN = BIT(0),
INET_FRAG_LAST_IN = BIT(1),
INET_FRAG_COMPLETE = BIT(2),
INET_FRAG_HASH_DEAD = BIT(3),
INET_FRAG_DROP = BIT(4),
};
struct frag_v4_compare_key {
@ -139,7 +142,8 @@ void inet_frag_destroy(struct inet_frag_queue *q);
struct inet_frag_queue *inet_frag_find(struct fqdir *fqdir, void *key);
/* Free all skbs in the queue; return the sum of their truesizes. */
unsigned int inet_frag_rbtree_purge(struct rb_root *root);
unsigned int inet_frag_rbtree_purge(struct rb_root *root,
enum skb_drop_reason reason);
static inline void inet_frag_put(struct inet_frag_queue *q)
{

3
include/net/ipv6_frag.h
View File

@ -76,6 +76,7 @@ ip6frag_expire_frag_queue(struct net *net, struct frag_queue *fq)
if (fq->q.flags & INET_FRAG_COMPLETE)
goto out;
fq->q.flags |= INET_FRAG_DROP;
inet_frag_kill(&fq->q);
dev = dev_get_by_index_rcu(net, fq->iif);
@ -101,7 +102,7 @@ ip6frag_expire_frag_queue(struct net *net, struct frag_queue *fq)
spin_unlock(&fq->q.lock);
icmpv6_send(head, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
kfree_skb(head);
kfree_skb_reason(head, SKB_DROP_REASON_FRAG_REASM_TIMEOUT);
goto out_rcu_unlock;
out:

14
net/ipv4/inet_fragment.c
View File

@ -133,6 +133,7 @@ static void inet_frags_free_cb(void *ptr, void *arg)
count = del_timer_sync(&fq->timer) ? 1 : 0;
spin_lock_bh(&fq->lock);
fq->flags |= INET_FRAG_DROP;
if (!(fq->flags & INET_FRAG_COMPLETE)) {
fq->flags |= INET_FRAG_COMPLETE;
count++;
@ -260,7 +261,8 @@ static void inet_frag_destroy_rcu(struct rcu_head *head)
kmem_cache_free(f->frags_cachep, q);
}
unsigned int inet_frag_rbtree_purge(struct rb_root *root)
unsigned int inet_frag_rbtree_purge(struct rb_root *root,
enum skb_drop_reason reason)
{
struct rb_node *p = rb_first(root);
unsigned int sum = 0;
@ -274,7 +276,7 @@ unsigned int inet_frag_rbtree_purge(struct rb_root *root)
struct sk_buff *next = FRAG_CB(skb)->next_frag;
sum += skb->truesize;
kfree_skb(skb);
kfree_skb_reason(skb, reason);
skb = next;
}
}
@ -284,17 +286,21 @@ EXPORT_SYMBOL(inet_frag_rbtree_purge);
void inet_frag_destroy(struct inet_frag_queue *q)
{
struct fqdir *fqdir;
unsigned int sum, sum_truesize = 0;
enum skb_drop_reason reason;
struct inet_frags *f;
struct fqdir *fqdir;
WARN_ON(!(q->flags & INET_FRAG_COMPLETE));
reason = (q->flags & INET_FRAG_DROP) ?
SKB_DROP_REASON_FRAG_REASM_TIMEOUT :
SKB_CONSUMED;
WARN_ON(del_timer(&q->timer) != 0);
/* Release all fragment data. */
fqdir = q->fqdir;
f = fqdir->f;
sum_truesize = inet_frag_rbtree_purge(&q->rb_fragments);
sum_truesize = inet_frag_rbtree_purge(&q->rb_fragments, reason);
sum = sum_truesize + f->qsize;
call_rcu(&q->rcu, inet_frag_destroy_rcu);

6
net/ipv4/ip_fragment.c
View File

@ -153,6 +153,7 @@ static void ip_expire(struct timer_list *t)
if (qp->q.flags & INET_FRAG_COMPLETE)
goto out;
qp->q.flags |= INET_FRAG_DROP;
ipq_kill(qp);
__IP_INC_STATS(net, IPSTATS_MIB_REASMFAILS);
__IP_INC_STATS(net, IPSTATS_MIB_REASMTIMEOUT);
@ -194,7 +195,7 @@ out:
spin_unlock(&qp->q.lock);
out_rcu_unlock:
rcu_read_unlock();
kfree_skb(head);
kfree_skb_reason(head, SKB_DROP_REASON_FRAG_REASM_TIMEOUT);
ipq_put(qp);
}
@ -254,7 +255,8 @@ static int ip_frag_reinit(struct ipq *qp)
return -ETIMEDOUT;
}
sum_truesize = inet_frag_rbtree_purge(&qp->q.rb_fragments);
sum_truesize = inet_frag_rbtree_purge(&qp->q.rb_fragments,
SKB_DROP_REASON_NOT_SPECIFIED);
sub_frag_mem_limit(qp->q.fqdir, sum_truesize);
qp->q.flags = 0;