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net: dropreason: add SKB_DROP_REASON_FRAG_TOO_FAR

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IPv4 reassembly unit can decide to drop frags based on
/proc/sys/net/ipv4/ipfrag_max_dist sysctl.

Add a specific drop reason to track this specific
and weird case.

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 15:45:20 +00:00
committed by Jakub Kicinski
parent 77adfd3a1d
commit 3bdfb04f13
2 changed files with 7 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/dropreason.h
View File

@@ -70,6 +70,7 @@
FN(PKT_TOO_BIG) \ FN(PKT_TOO_BIG) \
FN(DUP_FRAG) \ FN(DUP_FRAG) \
FN(FRAG_REASM_TIMEOUT) \ FN(FRAG_REASM_TIMEOUT) \
FN(FRAG_TOO_FAR) \
FNe(MAX) FNe(MAX)
/** /**
@@ -306,6 +307,11 @@ enum skb_drop_reason {
SKB_DROP_REASON_DUP_FRAG, SKB_DROP_REASON_DUP_FRAG,
/** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */ /** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly timeout */
SKB_DROP_REASON_FRAG_REASM_TIMEOUT, SKB_DROP_REASON_FRAG_REASM_TIMEOUT,
/**
* @SKB_DROP_REASON_FRAG_TOO_FAR: ipv4 fragment too far.
* (/proc/sys/net/ipv4/ipfrag_max_dist)
*/
SKB_DROP_REASON_FRAG_TOO_FAR,
/** /**
* @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be * @SKB_DROP_REASON_MAX: the maximum of drop reason, which shouldn't be
* used as a real 'reason' * used as a real 'reason'

2
net/ipv4/ip_fragment.c
View File

@@ -256,7 +256,7 @@ static int ip_frag_reinit(struct ipq *qp)
} }
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); SKB_DROP_REASON_FRAG_TOO_FAR);
sub_frag_mem_limit(qp->q.fqdir, sum_truesize); sub_frag_mem_limit(qp->q.fqdir, sum_truesize);
qp->q.flags = 0; qp->q.flags = 0;