Commit | Line | Data |
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5ab11c98 PE |
1 | #ifndef __NET_FRAG_H__ |
2 | #define __NET_FRAG_H__ | |
3 | ||
ac18e750 | 4 | struct netns_frags { |
fb452a1a JDB |
5 | /* Keep atomic mem on separate cachelines in structs that include it */ |
6 | atomic_t mem ____cacheline_aligned_in_smp; | |
b2fd5321 PE |
7 | /* sysctls */ |
8 | int timeout; | |
e31e0bdc PE |
9 | int high_thresh; |
10 | int low_thresh; | |
0fbf4cb2 | 11 | int max_dist; |
ac18e750 PE |
12 | }; |
13 | ||
1ab1934e NA |
14 | /** |
15 | * fragment queue flags | |
16 | * | |
17 | * @INET_FRAG_FIRST_IN: first fragment has arrived | |
18 | * @INET_FRAG_LAST_IN: final fragment has arrived | |
19 | * @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction | |
1ab1934e NA |
20 | */ |
21 | enum { | |
22 | INET_FRAG_FIRST_IN = BIT(0), | |
23 | INET_FRAG_LAST_IN = BIT(1), | |
24 | INET_FRAG_COMPLETE = BIT(2), | |
1ab1934e NA |
25 | }; |
26 | ||
27 | /** | |
28 | * struct inet_frag_queue - fragment queue | |
29 | * | |
30 | * @lock: spinlock protecting the queue | |
31 | * @timer: queue expiration timer | |
32 | * @list: hash bucket list | |
33 | * @refcnt: reference count of the queue | |
34 | * @fragments: received fragments head | |
35 | * @fragments_tail: received fragments tail | |
36 | * @stamp: timestamp of the last received fragment | |
37 | * @len: total length of the original datagram | |
38 | * @meat: length of received fragments so far | |
39 | * @flags: fragment queue flags | |
d6b915e2 | 40 | * @max_size: maximum received fragment size |
1ab1934e | 41 | * @net: namespace that this frag belongs to |
d1fe1944 | 42 | * @list_evictor: list of queues to forcefully evict (e.g. due to low memory) |
1ab1934e | 43 | */ |
5ab11c98 | 44 | struct inet_frag_queue { |
5ab11c98 | 45 | spinlock_t lock; |
1ab1934e | 46 | struct timer_list timer; |
6e34a8b3 | 47 | struct hlist_node list; |
edcb6918 | 48 | refcount_t refcnt; |
1ab1934e | 49 | struct sk_buff *fragments; |
d6bebca9 | 50 | struct sk_buff *fragments_tail; |
5ab11c98 | 51 | ktime_t stamp; |
1ab1934e | 52 | int len; |
5ab11c98 | 53 | int meat; |
1ab1934e | 54 | __u8 flags; |
5f2d04f1 | 55 | u16 max_size; |
6e34a8b3 | 56 | struct netns_frags *net; |
d1fe1944 | 57 | struct hlist_node list_evictor; |
5ab11c98 PE |
58 | }; |
59 | ||
a4c4009f | 60 | #define INETFRAGS_HASHSZ 1024 |
7eb95156 | 61 | |
5a3da1fe HFS |
62 | /* averaged: |
63 | * max_depth = default ipfrag_high_thresh / INETFRAGS_HASHSZ / | |
64 | * rounded up (SKB_TRUELEN(0) + sizeof(struct ipq or | |
65 | * struct frag_queue)) | |
66 | */ | |
b13d3cbf | 67 | #define INETFRAGS_MAXDEPTH 128 |
5a3da1fe | 68 | |
19952cc4 JDB |
69 | struct inet_frag_bucket { |
70 | struct hlist_head chain; | |
71 | spinlock_t chain_lock; | |
72 | }; | |
73 | ||
7eb95156 | 74 | struct inet_frags { |
19952cc4 | 75 | struct inet_frag_bucket hash[INETFRAGS_HASHSZ]; |
7088ad74 | 76 | |
b13d3cbf FW |
77 | struct work_struct frags_work; |
78 | unsigned int next_bucket; | |
e3a57d18 FW |
79 | unsigned long last_rebuild_jiffies; |
80 | bool rebuild; | |
b13d3cbf | 81 | |
7088ad74 HFS |
82 | /* The first call to hashfn is responsible to initialize |
83 | * rnd. This is best done with net_get_random_once. | |
ab1c724f FW |
84 | * |
85 | * rnd_seqlock is used to let hash insertion detect | |
86 | * when it needs to re-lookup the hash chain to use. | |
7088ad74 | 87 | */ |
5f8e1e8b | 88 | u32 rnd; |
ab1c724f | 89 | seqlock_t rnd_seqlock; |
4c0ebd6f | 90 | unsigned int qsize; |
321a3a99 | 91 | |
36c77782 FW |
92 | unsigned int (*hashfn)(const struct inet_frag_queue *); |
93 | bool (*match)(const struct inet_frag_queue *q, | |
94 | const void *arg); | |
c6fda282 | 95 | void (*constructor)(struct inet_frag_queue *q, |
36c77782 | 96 | const void *arg); |
1e4b8287 | 97 | void (*destructor)(struct inet_frag_queue *); |
e521db9d | 98 | void (*frag_expire)(unsigned long data); |
d4ad4d22 NA |
99 | struct kmem_cache *frags_cachep; |
100 | const char *frags_cache_name; | |
7eb95156 PE |
101 | }; |
102 | ||
d4ad4d22 | 103 | int inet_frags_init(struct inet_frags *); |
7eb95156 PE |
104 | void inet_frags_fini(struct inet_frags *); |
105 | ||
5a63643e | 106 | static inline void inet_frags_init_net(struct netns_frags *nf) |
1d6119ba | 107 | { |
fb452a1a | 108 | atomic_set(&nf->mem, 0); |
1d6119ba | 109 | } |
81566e83 | 110 | void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f); |
e5a2bb84 | 111 | |
277e650d | 112 | void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f); |
3fd588eb | 113 | void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f); |
ac18e750 | 114 | struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, |
ab1c724f FW |
115 | struct inet_frags *f, void *key, unsigned int hash); |
116 | ||
5a3da1fe HFS |
117 | void inet_frag_maybe_warn_overflow(struct inet_frag_queue *q, |
118 | const char *prefix); | |
277e650d | 119 | |
762cc408 PE |
120 | static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f) |
121 | { | |
edcb6918 | 122 | if (refcount_dec_and_test(&q->refcnt)) |
3fd588eb | 123 | inet_frag_destroy(q, f); |
762cc408 PE |
124 | } |
125 | ||
caaecdd3 NA |
126 | static inline bool inet_frag_evicting(struct inet_frag_queue *q) |
127 | { | |
128 | return !hlist_unhashed(&q->list_evictor); | |
129 | } | |
130 | ||
d433673e JDB |
131 | /* Memory Tracking Functions. */ |
132 | ||
133 | static inline int frag_mem_limit(struct netns_frags *nf) | |
134 | { | |
fb452a1a | 135 | return atomic_read(&nf->mem); |
d433673e JDB |
136 | } |
137 | ||
0e60d245 | 138 | static inline void sub_frag_mem_limit(struct netns_frags *nf, int i) |
d433673e | 139 | { |
fb452a1a | 140 | atomic_sub(i, &nf->mem); |
d433673e JDB |
141 | } |
142 | ||
0e60d245 | 143 | static inline void add_frag_mem_limit(struct netns_frags *nf, int i) |
d433673e | 144 | { |
fb452a1a | 145 | atomic_add(i, &nf->mem); |
d433673e JDB |
146 | } |
147 | ||
fb452a1a | 148 | static inline int sum_frag_mem_limit(struct netns_frags *nf) |
d433673e | 149 | { |
fb452a1a | 150 | return atomic_read(&nf->mem); |
d433673e JDB |
151 | } |
152 | ||
be991971 HFS |
153 | /* RFC 3168 support : |
154 | * We want to check ECN values of all fragments, do detect invalid combinations. | |
155 | * In ipq->ecn, we store the OR value of each ip4_frag_ecn() fragment value. | |
156 | */ | |
157 | #define IPFRAG_ECN_NOT_ECT 0x01 /* one frag had ECN_NOT_ECT */ | |
158 | #define IPFRAG_ECN_ECT_1 0x02 /* one frag had ECN_ECT_1 */ | |
159 | #define IPFRAG_ECN_ECT_0 0x04 /* one frag had ECN_ECT_0 */ | |
160 | #define IPFRAG_ECN_CE 0x08 /* one frag had ECN_CE */ | |
161 | ||
162 | extern const u8 ip_frag_ecn_table[16]; | |
163 | ||
5ab11c98 | 164 | #endif |