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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
5ab11c98 PE |
2 | #ifndef __NET_FRAG_H__ |
3 | #define __NET_FRAG_H__ | |
4 | ||
ac18e750 | 5 | struct netns_frags { |
fb452a1a JDB |
6 | /* Keep atomic mem on separate cachelines in structs that include it */ |
7 | atomic_t mem ____cacheline_aligned_in_smp; | |
b2fd5321 PE |
8 | /* sysctls */ |
9 | int timeout; | |
e31e0bdc PE |
10 | int high_thresh; |
11 | int low_thresh; | |
0fbf4cb2 | 12 | int max_dist; |
ac18e750 PE |
13 | }; |
14 | ||
1ab1934e NA |
15 | /** |
16 | * fragment queue flags | |
17 | * | |
18 | * @INET_FRAG_FIRST_IN: first fragment has arrived | |
19 | * @INET_FRAG_LAST_IN: final fragment has arrived | |
20 | * @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction | |
1ab1934e NA |
21 | */ |
22 | enum { | |
23 | INET_FRAG_FIRST_IN = BIT(0), | |
24 | INET_FRAG_LAST_IN = BIT(1), | |
25 | INET_FRAG_COMPLETE = BIT(2), | |
1ab1934e NA |
26 | }; |
27 | ||
28 | /** | |
29 | * struct inet_frag_queue - fragment queue | |
30 | * | |
31 | * @lock: spinlock protecting the queue | |
32 | * @timer: queue expiration timer | |
33 | * @list: hash bucket list | |
34 | * @refcnt: reference count of the queue | |
35 | * @fragments: received fragments head | |
36 | * @fragments_tail: received fragments tail | |
37 | * @stamp: timestamp of the last received fragment | |
38 | * @len: total length of the original datagram | |
39 | * @meat: length of received fragments so far | |
40 | * @flags: fragment queue flags | |
d6b915e2 | 41 | * @max_size: maximum received fragment size |
1ab1934e | 42 | * @net: namespace that this frag belongs to |
d1fe1944 | 43 | * @list_evictor: list of queues to forcefully evict (e.g. due to low memory) |
1ab1934e | 44 | */ |
5ab11c98 | 45 | struct inet_frag_queue { |
5ab11c98 | 46 | spinlock_t lock; |
1ab1934e | 47 | struct timer_list timer; |
6e34a8b3 | 48 | struct hlist_node list; |
edcb6918 | 49 | refcount_t refcnt; |
1ab1934e | 50 | struct sk_buff *fragments; |
d6bebca9 | 51 | struct sk_buff *fragments_tail; |
5ab11c98 | 52 | ktime_t stamp; |
1ab1934e | 53 | int len; |
5ab11c98 | 54 | int meat; |
1ab1934e | 55 | __u8 flags; |
5f2d04f1 | 56 | u16 max_size; |
6e34a8b3 | 57 | struct netns_frags *net; |
d1fe1944 | 58 | struct hlist_node list_evictor; |
5ab11c98 PE |
59 | }; |
60 | ||
a4c4009f | 61 | #define INETFRAGS_HASHSZ 1024 |
7eb95156 | 62 | |
5a3da1fe HFS |
63 | /* averaged: |
64 | * max_depth = default ipfrag_high_thresh / INETFRAGS_HASHSZ / | |
65 | * rounded up (SKB_TRUELEN(0) + sizeof(struct ipq or | |
66 | * struct frag_queue)) | |
67 | */ | |
b13d3cbf | 68 | #define INETFRAGS_MAXDEPTH 128 |
5a3da1fe | 69 | |
19952cc4 JDB |
70 | struct inet_frag_bucket { |
71 | struct hlist_head chain; | |
72 | spinlock_t chain_lock; | |
73 | }; | |
74 | ||
7eb95156 | 75 | struct inet_frags { |
19952cc4 | 76 | struct inet_frag_bucket hash[INETFRAGS_HASHSZ]; |
7088ad74 | 77 | |
b13d3cbf FW |
78 | struct work_struct frags_work; |
79 | unsigned int next_bucket; | |
e3a57d18 FW |
80 | unsigned long last_rebuild_jiffies; |
81 | bool rebuild; | |
b13d3cbf | 82 | |
7088ad74 HFS |
83 | /* The first call to hashfn is responsible to initialize |
84 | * rnd. This is best done with net_get_random_once. | |
ab1c724f FW |
85 | * |
86 | * rnd_seqlock is used to let hash insertion detect | |
87 | * when it needs to re-lookup the hash chain to use. | |
7088ad74 | 88 | */ |
5f8e1e8b | 89 | u32 rnd; |
ab1c724f | 90 | seqlock_t rnd_seqlock; |
4c0ebd6f | 91 | unsigned int qsize; |
321a3a99 | 92 | |
36c77782 FW |
93 | unsigned int (*hashfn)(const struct inet_frag_queue *); |
94 | bool (*match)(const struct inet_frag_queue *q, | |
95 | const void *arg); | |
c6fda282 | 96 | void (*constructor)(struct inet_frag_queue *q, |
36c77782 | 97 | const void *arg); |
1e4b8287 | 98 | void (*destructor)(struct inet_frag_queue *); |
78802011 | 99 | void (*frag_expire)(struct timer_list *t); |
d4ad4d22 NA |
100 | struct kmem_cache *frags_cachep; |
101 | const char *frags_cache_name; | |
7eb95156 PE |
102 | }; |
103 | ||
d4ad4d22 | 104 | int inet_frags_init(struct inet_frags *); |
7eb95156 PE |
105 | void inet_frags_fini(struct inet_frags *); |
106 | ||
5a63643e | 107 | static inline void inet_frags_init_net(struct netns_frags *nf) |
1d6119ba | 108 | { |
fb452a1a | 109 | atomic_set(&nf->mem, 0); |
1d6119ba | 110 | } |
81566e83 | 111 | void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f); |
e5a2bb84 | 112 | |
277e650d | 113 | void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f); |
3fd588eb | 114 | void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f); |
ac18e750 | 115 | struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, |
ab1c724f FW |
116 | struct inet_frags *f, void *key, unsigned int hash); |
117 | ||
5a3da1fe HFS |
118 | void inet_frag_maybe_warn_overflow(struct inet_frag_queue *q, |
119 | const char *prefix); | |
277e650d | 120 | |
762cc408 PE |
121 | static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f) |
122 | { | |
edcb6918 | 123 | if (refcount_dec_and_test(&q->refcnt)) |
3fd588eb | 124 | inet_frag_destroy(q, f); |
762cc408 PE |
125 | } |
126 | ||
caaecdd3 NA |
127 | static inline bool inet_frag_evicting(struct inet_frag_queue *q) |
128 | { | |
129 | return !hlist_unhashed(&q->list_evictor); | |
130 | } | |
131 | ||
d433673e JDB |
132 | /* Memory Tracking Functions. */ |
133 | ||
134 | static inline int frag_mem_limit(struct netns_frags *nf) | |
135 | { | |
fb452a1a | 136 | return atomic_read(&nf->mem); |
d433673e JDB |
137 | } |
138 | ||
0e60d245 | 139 | static inline void sub_frag_mem_limit(struct netns_frags *nf, int i) |
d433673e | 140 | { |
fb452a1a | 141 | atomic_sub(i, &nf->mem); |
d433673e JDB |
142 | } |
143 | ||
0e60d245 | 144 | static inline void add_frag_mem_limit(struct netns_frags *nf, int i) |
d433673e | 145 | { |
fb452a1a | 146 | atomic_add(i, &nf->mem); |
d433673e JDB |
147 | } |
148 | ||
fb452a1a | 149 | static inline int sum_frag_mem_limit(struct netns_frags *nf) |
d433673e | 150 | { |
fb452a1a | 151 | return atomic_read(&nf->mem); |
d433673e JDB |
152 | } |
153 | ||
be991971 HFS |
154 | /* RFC 3168 support : |
155 | * We want to check ECN values of all fragments, do detect invalid combinations. | |
156 | * In ipq->ecn, we store the OR value of each ip4_frag_ecn() fragment value. | |
157 | */ | |
158 | #define IPFRAG_ECN_NOT_ECT 0x01 /* one frag had ECN_NOT_ECT */ | |
159 | #define IPFRAG_ECN_ECT_1 0x02 /* one frag had ECN_ECT_1 */ | |
160 | #define IPFRAG_ECN_ECT_0 0x04 /* one frag had ECN_ECT_0 */ | |
161 | #define IPFRAG_ECN_CE 0x08 /* one frag had ECN_CE */ | |
162 | ||
163 | extern const u8 ip_frag_ecn_table[16]; | |
164 | ||
5ab11c98 | 165 | #endif |