1 /* SPDX-License-Identifier: GPL-2.0 */
4 #include <linux/kernel.h>
5 #include <net/addrconf.h>
7 #include <net/inet_frag.h>
9 enum ip6_defrag_users {
10 IP6_DEFRAG_LOCAL_DELIVER,
11 IP6_DEFRAG_CONNTRACK_IN,
12 __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
13 IP6_DEFRAG_CONNTRACK_OUT,
14 __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
15 IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
16 __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
20 * Equivalent of ipv4 struct ip
23 struct inet_frag_queue q;
30 #if IS_ENABLED(CONFIG_IPV6)
31 static inline void ip6frag_init(struct inet_frag_queue *q, const void *a)
33 struct frag_queue *fq = container_of(q, struct frag_queue, q);
34 const struct frag_v6_compare_key *key = a;
40 static inline u32 ip6frag_key_hashfn(const void *data, u32 len, u32 seed)
43 sizeof(struct frag_v6_compare_key) / sizeof(u32), seed);
46 static inline u32 ip6frag_obj_hashfn(const void *data, u32 len, u32 seed)
48 const struct inet_frag_queue *fq = data;
50 return jhash2((const u32 *)&fq->key.v6,
51 sizeof(struct frag_v6_compare_key) / sizeof(u32), seed);
55 ip6frag_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr)
57 const struct frag_v6_compare_key *key = arg->key;
58 const struct inet_frag_queue *fq = ptr;
60 return !!memcmp(&fq->key, key, sizeof(*key));
64 ip6frag_expire_frag_queue(struct net *net, struct frag_queue *fq)
66 struct net_device *dev = NULL;
70 spin_lock(&fq->q.lock);
72 if (fq->q.flags & INET_FRAG_COMPLETE)
75 inet_frag_kill(&fq->q);
77 dev = dev_get_by_index_rcu(net, fq->iif);
81 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
82 __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
84 /* Don't send error if the first segment did not arrive. */
85 head = fq->q.fragments;
86 if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !head)
91 spin_unlock(&fq->q.lock);
93 icmpv6_send(head, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
98 spin_unlock(&fq->q.lock);
101 inet_frag_put(&fq->q);