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 | ||
648700f7 ED |
5 | #include <linux/rhashtable.h> |
6 | ||
ac18e750 | 7 | struct netns_frags { |
648700f7 ED |
8 | struct rhashtable rhashtable ____cacheline_aligned_in_smp; |
9 | ||
fb452a1a | 10 | /* Keep atomic mem on separate cachelines in structs that include it */ |
3e67f106 | 11 | atomic_long_t mem ____cacheline_aligned_in_smp; |
b2fd5321 | 12 | /* sysctls */ |
3e67f106 ED |
13 | long high_thresh; |
14 | long low_thresh; | |
b2fd5321 | 15 | int timeout; |
0fbf4cb2 | 16 | int max_dist; |
093ba729 | 17 | struct inet_frags *f; |
ac18e750 PE |
18 | }; |
19 | ||
1ab1934e NA |
20 | /** |
21 | * fragment queue flags | |
22 | * | |
23 | * @INET_FRAG_FIRST_IN: first fragment has arrived | |
24 | * @INET_FRAG_LAST_IN: final fragment has arrived | |
25 | * @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction | |
1ab1934e NA |
26 | */ |
27 | enum { | |
28 | INET_FRAG_FIRST_IN = BIT(0), | |
29 | INET_FRAG_LAST_IN = BIT(1), | |
30 | INET_FRAG_COMPLETE = BIT(2), | |
1ab1934e NA |
31 | }; |
32 | ||
648700f7 ED |
33 | struct frag_v4_compare_key { |
34 | __be32 saddr; | |
35 | __be32 daddr; | |
36 | u32 user; | |
37 | u32 vif; | |
38 | __be16 id; | |
39 | u16 protocol; | |
40 | }; | |
41 | ||
42 | struct frag_v6_compare_key { | |
43 | struct in6_addr saddr; | |
44 | struct in6_addr daddr; | |
45 | u32 user; | |
46 | __be32 id; | |
47 | u32 iif; | |
48 | }; | |
49 | ||
1ab1934e NA |
50 | /** |
51 | * struct inet_frag_queue - fragment queue | |
52 | * | |
648700f7 ED |
53 | * @node: rhash node |
54 | * @key: keys identifying this frag. | |
1ab1934e | 55 | * @timer: queue expiration timer |
648700f7 | 56 | * @lock: spinlock protecting this frag |
1ab1934e NA |
57 | * @refcnt: reference count of the queue |
58 | * @fragments: received fragments head | |
59 | * @fragments_tail: received fragments tail | |
60 | * @stamp: timestamp of the last received fragment | |
61 | * @len: total length of the original datagram | |
62 | * @meat: length of received fragments so far | |
63 | * @flags: fragment queue flags | |
d6b915e2 | 64 | * @max_size: maximum received fragment size |
1ab1934e | 65 | * @net: namespace that this frag belongs to |
648700f7 | 66 | * @rcu: rcu head for freeing deferall |
1ab1934e | 67 | */ |
5ab11c98 | 68 | struct inet_frag_queue { |
648700f7 ED |
69 | struct rhash_head node; |
70 | union { | |
71 | struct frag_v4_compare_key v4; | |
72 | struct frag_v6_compare_key v6; | |
73 | } key; | |
1ab1934e | 74 | struct timer_list timer; |
648700f7 | 75 | spinlock_t lock; |
edcb6918 | 76 | refcount_t refcnt; |
1ab1934e | 77 | struct sk_buff *fragments; |
d6bebca9 | 78 | struct sk_buff *fragments_tail; |
5ab11c98 | 79 | ktime_t stamp; |
1ab1934e | 80 | int len; |
5ab11c98 | 81 | int meat; |
1ab1934e | 82 | __u8 flags; |
5f2d04f1 | 83 | u16 max_size; |
648700f7 ED |
84 | struct netns_frags *net; |
85 | struct rcu_head rcu; | |
19952cc4 JDB |
86 | }; |
87 | ||
7eb95156 | 88 | struct inet_frags { |
4c0ebd6f | 89 | unsigned int qsize; |
321a3a99 | 90 | |
c6fda282 | 91 | void (*constructor)(struct inet_frag_queue *q, |
36c77782 | 92 | const void *arg); |
1e4b8287 | 93 | void (*destructor)(struct inet_frag_queue *); |
78802011 | 94 | void (*frag_expire)(struct timer_list *t); |
d4ad4d22 NA |
95 | struct kmem_cache *frags_cachep; |
96 | const char *frags_cache_name; | |
648700f7 | 97 | struct rhashtable_params rhash_params; |
7eb95156 PE |
98 | }; |
99 | ||
d4ad4d22 | 100 | int inet_frags_init(struct inet_frags *); |
7eb95156 PE |
101 | void inet_frags_fini(struct inet_frags *); |
102 | ||
787bea77 | 103 | static inline int inet_frags_init_net(struct netns_frags *nf) |
1d6119ba | 104 | { |
3e67f106 | 105 | atomic_long_set(&nf->mem, 0); |
648700f7 | 106 | return rhashtable_init(&nf->rhashtable, &nf->f->rhash_params); |
1d6119ba | 107 | } |
093ba729 | 108 | void inet_frags_exit_net(struct netns_frags *nf); |
e5a2bb84 | 109 | |
093ba729 ED |
110 | void inet_frag_kill(struct inet_frag_queue *q); |
111 | void inet_frag_destroy(struct inet_frag_queue *q); | |
648700f7 | 112 | struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, void *key); |
277e650d | 113 | |
093ba729 | 114 | static inline void inet_frag_put(struct inet_frag_queue *q) |
762cc408 | 115 | { |
edcb6918 | 116 | if (refcount_dec_and_test(&q->refcnt)) |
093ba729 | 117 | inet_frag_destroy(q); |
762cc408 PE |
118 | } |
119 | ||
d433673e JDB |
120 | /* Memory Tracking Functions. */ |
121 | ||
3e67f106 | 122 | static inline long frag_mem_limit(const struct netns_frags *nf) |
d433673e | 123 | { |
3e67f106 | 124 | return atomic_long_read(&nf->mem); |
d433673e JDB |
125 | } |
126 | ||
3e67f106 | 127 | static inline void sub_frag_mem_limit(struct netns_frags *nf, long val) |
d433673e | 128 | { |
3e67f106 | 129 | atomic_long_sub(val, &nf->mem); |
d433673e JDB |
130 | } |
131 | ||
3e67f106 | 132 | static inline void add_frag_mem_limit(struct netns_frags *nf, long val) |
d433673e | 133 | { |
3e67f106 | 134 | atomic_long_add(val, &nf->mem); |
d433673e JDB |
135 | } |
136 | ||
be991971 HFS |
137 | /* RFC 3168 support : |
138 | * We want to check ECN values of all fragments, do detect invalid combinations. | |
139 | * In ipq->ecn, we store the OR value of each ip4_frag_ecn() fragment value. | |
140 | */ | |
141 | #define IPFRAG_ECN_NOT_ECT 0x01 /* one frag had ECN_NOT_ECT */ | |
142 | #define IPFRAG_ECN_ECT_1 0x02 /* one frag had ECN_ECT_1 */ | |
143 | #define IPFRAG_ECN_ECT_0 0x04 /* one frag had ECN_ECT_0 */ | |
144 | #define IPFRAG_ECN_CE 0x08 /* one frag had ECN_CE */ | |
145 | ||
146 | extern const u8 ip_frag_ecn_table[16]; | |
147 | ||
5ab11c98 | 148 | #endif |