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70b095c8 FW |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _IPV6_FRAG_H | |
3 | #define _IPV6_FRAG_H | |
4 | #include <linux/kernel.h> | |
5 | #include <net/addrconf.h> | |
6 | #include <net/ipv6.h> | |
7 | #include <net/inet_frag.h> | |
8 | ||
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, | |
17 | }; | |
18 | ||
19 | /* | |
20 | * Equivalent of ipv4 struct ip | |
21 | */ | |
22 | struct frag_queue { | |
23 | struct inet_frag_queue q; | |
24 | ||
25 | int iif; | |
26 | __u16 nhoffset; | |
27 | u8 ecn; | |
28 | }; | |
29 | ||
30 | #if IS_ENABLED(CONFIG_IPV6) | |
31 | static inline void ip6frag_init(struct inet_frag_queue *q, const void *a) | |
32 | { | |
33 | struct frag_queue *fq = container_of(q, struct frag_queue, q); | |
34 | const struct frag_v6_compare_key *key = a; | |
35 | ||
36 | q->key.v6 = *key; | |
37 | fq->ecn = 0; | |
38 | } | |
39 | ||
40 | static inline u32 ip6frag_key_hashfn(const void *data, u32 len, u32 seed) | |
41 | { | |
42 | return jhash2(data, | |
43 | sizeof(struct frag_v6_compare_key) / sizeof(u32), seed); | |
44 | } | |
45 | ||
46 | static inline u32 ip6frag_obj_hashfn(const void *data, u32 len, u32 seed) | |
47 | { | |
48 | const struct inet_frag_queue *fq = data; | |
49 | ||
50 | return jhash2((const u32 *)&fq->key.v6, | |
51 | sizeof(struct frag_v6_compare_key) / sizeof(u32), seed); | |
52 | } | |
53 | ||
54 | static inline int | |
55 | ip6frag_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr) | |
56 | { | |
57 | const struct frag_v6_compare_key *key = arg->key; | |
58 | const struct inet_frag_queue *fq = ptr; | |
59 | ||
60 | return !!memcmp(&fq->key, key, sizeof(*key)); | |
61 | } | |
62 | ||
63 | static inline void | |
64 | ip6frag_expire_frag_queue(struct net *net, struct frag_queue *fq) | |
65 | { | |
66 | struct net_device *dev = NULL; | |
67 | struct sk_buff *head; | |
68 | ||
69 | rcu_read_lock(); | |
d5dd8879 ED |
70 | if (fq->q.fqdir->dead) |
71 | goto out_rcu_unlock; | |
70b095c8 FW |
72 | spin_lock(&fq->q.lock); |
73 | ||
74 | if (fq->q.flags & INET_FRAG_COMPLETE) | |
75 | goto out; | |
76 | ||
77 | inet_frag_kill(&fq->q); | |
78 | ||
79 | dev = dev_get_by_index_rcu(net, fq->iif); | |
80 | if (!dev) | |
81 | goto out; | |
82 | ||
83 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); | |
84 | __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT); | |
85 | ||
86 | /* Don't send error if the first segment did not arrive. */ | |
d4289fcc PO |
87 | if (!(fq->q.flags & INET_FRAG_FIRST_IN)) |
88 | goto out; | |
89 | ||
90 | /* sk_buff::dev and sk_buff::rbnode are unionized. So we | |
91 | * pull the head out of the tree in order to be able to | |
92 | * deal with head->dev. | |
93 | */ | |
94 | head = inet_frag_pull_head(&fq->q); | |
95 | if (!head) | |
70b095c8 FW |
96 | goto out; |
97 | ||
98 | head->dev = dev; | |
70b095c8 FW |
99 | spin_unlock(&fq->q.lock); |
100 | ||
101 | icmpv6_send(head, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0); | |
102 | kfree_skb(head); | |
103 | goto out_rcu_unlock; | |
104 | ||
105 | out: | |
106 | spin_unlock(&fq->q.lock); | |
107 | out_rcu_unlock: | |
108 | rcu_read_unlock(); | |
109 | inet_frag_put(&fq->q); | |
110 | } | |
2d8f6481 GK |
111 | |
112 | /* Check if the upper layer header is truncated in the first fragment. */ | |
113 | static inline bool | |
114 | ipv6frag_thdr_truncated(struct sk_buff *skb, int start, u8 *nexthdrp) | |
115 | { | |
116 | u8 nexthdr = *nexthdrp; | |
117 | __be16 frag_off; | |
118 | int offset; | |
119 | ||
120 | offset = ipv6_skip_exthdr(skb, start, &nexthdr, &frag_off); | |
121 | if (offset < 0 || (frag_off & htons(IP6_OFFSET))) | |
122 | return false; | |
123 | switch (nexthdr) { | |
124 | case NEXTHDR_TCP: | |
125 | offset += sizeof(struct tcphdr); | |
126 | break; | |
127 | case NEXTHDR_UDP: | |
128 | offset += sizeof(struct udphdr); | |
129 | break; | |
130 | case NEXTHDR_ICMP: | |
131 | offset += sizeof(struct icmp6hdr); | |
132 | break; | |
133 | default: | |
134 | offset += 1; | |
135 | } | |
136 | if (offset > skb->len) | |
137 | return true; | |
138 | return false; | |
139 | } | |
140 | ||
70b095c8 FW |
141 | #endif |
142 | #endif |