Commit 3bdfb04f authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

net: dropreason: add SKB_DROP_REASON_FRAG_TOO_FAR 



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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 77adfd3a

include/net/dropreason.h

+6 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ 
	FN(PKT_TOO_BIG)			\

	FN(DUP_FRAG)			\

	FN(FRAG_REASM_TIMEOUT)		\

	FN(FRAG_TOO_FAR)		\

	FNe(MAX)



/**
@@ -306,6 +307,11 @@ enum skb_drop_reason { 
	SKB_DROP_REASON_DUP_FRAG,

	/** @SKB_DROP_REASON_FRAG_REASM_TIMEOUT: fragment reassembly 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

	 * used as a real 'reason'

net/ipv4/ip_fragment.c

+1 −1
Original line number Diff line number Diff line
@@ -256,7 +256,7 @@ static int ip_frag_reinit(struct ipq *qp) 
	}



	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);



	qp->q.flags = 0;