From f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 01:04:47 +0000
Subject: [PATCH] add driver 5G
---
kernel/include/net/ipv6_frag.h | 33 +++++++++++++++++++++++++++++++++
1 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/kernel/include/net/ipv6_frag.h b/kernel/include/net/ipv6_frag.h
index 1f77fb4..0a47791 100644
--- a/kernel/include/net/ipv6_frag.h
+++ b/kernel/include/net/ipv6_frag.h
@@ -67,6 +67,9 @@
struct sk_buff *head;
rcu_read_lock();
+ /* Paired with the WRITE_ONCE() in fqdir_pre_exit(). */
+ if (READ_ONCE(fq->q.fqdir->dead))
+ goto out_rcu_unlock;
spin_lock(&fq->q.lock);
if (fq->q.flags & INET_FRAG_COMPLETE)
@@ -106,5 +109,35 @@
rcu_read_unlock();
inet_frag_put(&fq->q);
}
+
+/* Check if the upper layer header is truncated in the first fragment. */
+static inline bool
+ipv6frag_thdr_truncated(struct sk_buff *skb, int start, u8 *nexthdrp)
+{
+ u8 nexthdr = *nexthdrp;
+ __be16 frag_off;
+ int offset;
+
+ offset = ipv6_skip_exthdr(skb, start, &nexthdr, &frag_off);
+ if (offset < 0 || (frag_off & htons(IP6_OFFSET)))
+ return false;
+ switch (nexthdr) {
+ case NEXTHDR_TCP:
+ offset += sizeof(struct tcphdr);
+ break;
+ case NEXTHDR_UDP:
+ offset += sizeof(struct udphdr);
+ break;
+ case NEXTHDR_ICMP:
+ offset += sizeof(struct icmp6hdr);
+ break;
+ default:
+ offset += 1;
+ }
+ if (offset > skb->len)
+ return true;
+ return false;
+}
+
#endif
#endif
--
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