diff mbox series

[net-next,5/5] net: dropreason: add SKB_DROP_REASON_FRAG_TOO_FAR

Message ID 20221028133043.2312984-6-edumazet@google.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series inet: add drop monitor support | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 5329 this patch: 5329
netdev/cc_maintainers warning 2 maintainers not CCed: dsahern@kernel.org yoshfuji@linux-ipv6.org
netdev/build_clang success Errors and warnings before: 1119 this patch: 1119
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 5511 this patch: 5511
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 26 lines checked
netdev/kdoc success Errors and warnings before: 2 this patch: 2
netdev/source_inline success Was 0 now: 0

Commit Message

Eric Dumazet Oct. 28, 2022, 1:30 p.m. UTC 
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>
---
 include/net/dropreason.h | 6 ++++++
 net/ipv4/ip_fragment.c   | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/net/dropreason.h b/include/net/dropreason.h
index d3d44da889e4f002ed1485a10fd081184956c911..d3df766c117bc1b0373d9e19d9baad944b5fb776 100644
--- a/include/net/dropreason.h
+++ b/include/net/dropreason.h
@@ -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,
 	/** @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'
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 85e8113259c36881dd0153d9d68c818ebabccc0c..69c00ffdcf3e6336cb920902a43f4ad046cc8438 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -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;