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Diffstat (limited to 'net/ipv6/seg6.c')
-rw-r--r--net/ipv6/seg6.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c
index 37b434293bda..d2f8138e5a73 100644
--- a/net/ipv6/seg6.c
+++ b/net/ipv6/seg6.c
@@ -25,7 +25,7 @@
#include <net/seg6_hmac.h>
#endif
-bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
+bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced)
{
unsigned int tlv_offset;
int max_last_entry;
@@ -37,13 +37,17 @@ bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
if (((srh->hdrlen + 1) << 3) != len)
return false;
- max_last_entry = (srh->hdrlen / 2) - 1;
-
- if (srh->first_segment > max_last_entry)
+ if (!reduced && srh->segments_left > srh->first_segment) {
return false;
+ } else {
+ max_last_entry = (srh->hdrlen / 2) - 1;
- if (srh->segments_left > srh->first_segment + 1)
- return false;
+ if (srh->first_segment > max_last_entry)
+ return false;
+
+ if (srh->segments_left > srh->first_segment + 1)
+ return false;
+ }
tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);