]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
5ab11c98 PE |
2 | #ifndef __NET_FRAG_H__ |
3 | #define __NET_FRAG_H__ | |
4 | ||
0eb71a9d | 5 | #include <linux/rhashtable-types.h> |
dc93f46b | 6 | #include <linux/completion.h> |
648700f7 | 7 | |
6ce3b4dc ED |
8 | /* Per netns frag queues directory */ |
9 | struct fqdir { | |
b2fd5321 | 10 | /* sysctls */ |
3e67f106 ED |
11 | long high_thresh; |
12 | long low_thresh; | |
b2fd5321 | 13 | int timeout; |
0fbf4cb2 | 14 | int max_dist; |
093ba729 | 15 | struct inet_frags *f; |
a39aca67 | 16 | struct net *net; |
3c8fc878 | 17 | bool dead; |
c2615cf5 ED |
18 | |
19 | struct rhashtable rhashtable ____cacheline_aligned_in_smp; | |
20 | ||
21 | /* Keep atomic mem on separate cachelines in structs that include it */ | |
22 | atomic_long_t mem ____cacheline_aligned_in_smp; | |
d5dd8879 | 23 | struct work_struct destroy_work; |
0b9b2414 | 24 | struct llist_node free_list; |
ac18e750 PE |
25 | }; |
26 | ||
1ab1934e NA |
27 | /** |
28 | * fragment queue flags | |
29 | * | |
30 | * @INET_FRAG_FIRST_IN: first fragment has arrived | |
31 | * @INET_FRAG_LAST_IN: final fragment has arrived | |
32 | * @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction | |
3c8fc878 | 33 | * @INET_FRAG_HASH_DEAD: inet_frag_kill() has not removed fq from rhashtable |
1ab1934e NA |
34 | */ |
35 | enum { | |
36 | INET_FRAG_FIRST_IN = BIT(0), | |
37 | INET_FRAG_LAST_IN = BIT(1), | |
38 | INET_FRAG_COMPLETE = BIT(2), | |
3c8fc878 | 39 | INET_FRAG_HASH_DEAD = BIT(3), |
1ab1934e NA |
40 | }; |
41 | ||
648700f7 ED |
42 | struct frag_v4_compare_key { |
43 | __be32 saddr; | |
44 | __be32 daddr; | |
45 | u32 user; | |
46 | u32 vif; | |
47 | __be16 id; | |
48 | u16 protocol; | |
49 | }; | |
50 | ||
51 | struct frag_v6_compare_key { | |
52 | struct in6_addr saddr; | |
53 | struct in6_addr daddr; | |
54 | u32 user; | |
55 | __be32 id; | |
56 | u32 iif; | |
57 | }; | |
58 | ||
1ab1934e NA |
59 | /** |
60 | * struct inet_frag_queue - fragment queue | |
61 | * | |
648700f7 ED |
62 | * @node: rhash node |
63 | * @key: keys identifying this frag. | |
1ab1934e | 64 | * @timer: queue expiration timer |
648700f7 | 65 | * @lock: spinlock protecting this frag |
1ab1934e | 66 | * @refcnt: reference count of the queue |
353c9cb3 | 67 | * @rb_fragments: received fragments rb-tree root |
1ab1934e | 68 | * @fragments_tail: received fragments tail |
353c9cb3 | 69 | * @last_run_head: the head of the last "run". see ip_fragment.c |
1ab1934e NA |
70 | * @stamp: timestamp of the last received fragment |
71 | * @len: total length of the original datagram | |
72 | * @meat: length of received fragments so far | |
73 | * @flags: fragment queue flags | |
d6b915e2 | 74 | * @max_size: maximum received fragment size |
6ce3b4dc | 75 | * @fqdir: pointer to struct fqdir |
648700f7 | 76 | * @rcu: rcu head for freeing deferall |
1ab1934e | 77 | */ |
5ab11c98 | 78 | struct inet_frag_queue { |
648700f7 ED |
79 | struct rhash_head node; |
80 | union { | |
81 | struct frag_v4_compare_key v4; | |
82 | struct frag_v6_compare_key v6; | |
83 | } key; | |
1ab1934e | 84 | struct timer_list timer; |
648700f7 | 85 | spinlock_t lock; |
edcb6918 | 86 | refcount_t refcnt; |
d8cf757f | 87 | struct rb_root rb_fragments; |
d6bebca9 | 88 | struct sk_buff *fragments_tail; |
353c9cb3 | 89 | struct sk_buff *last_run_head; |
5ab11c98 | 90 | ktime_t stamp; |
1ab1934e | 91 | int len; |
5ab11c98 | 92 | int meat; |
1ab1934e | 93 | __u8 flags; |
5f2d04f1 | 94 | u16 max_size; |
6ce3b4dc | 95 | struct fqdir *fqdir; |
648700f7 | 96 | struct rcu_head rcu; |
19952cc4 JDB |
97 | }; |
98 | ||
7eb95156 | 99 | struct inet_frags { |
4c0ebd6f | 100 | unsigned int qsize; |
321a3a99 | 101 | |
c6fda282 | 102 | void (*constructor)(struct inet_frag_queue *q, |
36c77782 | 103 | const void *arg); |
1e4b8287 | 104 | void (*destructor)(struct inet_frag_queue *); |
78802011 | 105 | void (*frag_expire)(struct timer_list *t); |
d4ad4d22 NA |
106 | struct kmem_cache *frags_cachep; |
107 | const char *frags_cache_name; | |
648700f7 | 108 | struct rhashtable_params rhash_params; |
dc93f46b ED |
109 | refcount_t refcnt; |
110 | struct completion completion; | |
7eb95156 PE |
111 | }; |
112 | ||
d4ad4d22 | 113 | int inet_frags_init(struct inet_frags *); |
7eb95156 PE |
114 | void inet_frags_fini(struct inet_frags *); |
115 | ||
6b73d197 | 116 | int fqdir_init(struct fqdir **fqdirp, struct inet_frags *f, struct net *net); |
d5dd8879 | 117 | |
08003d0b | 118 | static inline void fqdir_pre_exit(struct fqdir *fqdir) |
d5dd8879 | 119 | { |
9198de9e ED |
120 | /* Prevent creation of new frags. |
121 | * Pairs with READ_ONCE() in inet_frag_find(). | |
122 | */ | |
123 | WRITE_ONCE(fqdir->high_thresh, 0); | |
124 | ||
125 | /* Pairs with READ_ONCE() in inet_frag_kill(), ip_expire() | |
126 | * and ip6frag_expire_frag_queue(). | |
127 | */ | |
128 | WRITE_ONCE(fqdir->dead, true); | |
d5dd8879 | 129 | } |
89fb9005 | 130 | void fqdir_exit(struct fqdir *fqdir); |
e5a2bb84 | 131 | |
093ba729 ED |
132 | void inet_frag_kill(struct inet_frag_queue *q); |
133 | void inet_frag_destroy(struct inet_frag_queue *q); | |
6ce3b4dc | 134 | struct inet_frag_queue *inet_frag_find(struct fqdir *fqdir, void *key); |
277e650d | 135 | |
353c9cb3 PO |
136 | /* Free all skbs in the queue; return the sum of their truesizes. */ |
137 | unsigned int inet_frag_rbtree_purge(struct rb_root *root); | |
138 | ||
093ba729 | 139 | static inline void inet_frag_put(struct inet_frag_queue *q) |
762cc408 | 140 | { |
edcb6918 | 141 | if (refcount_dec_and_test(&q->refcnt)) |
093ba729 | 142 | inet_frag_destroy(q); |
762cc408 PE |
143 | } |
144 | ||
d433673e JDB |
145 | /* Memory Tracking Functions. */ |
146 | ||
6ce3b4dc | 147 | static inline long frag_mem_limit(const struct fqdir *fqdir) |
d433673e | 148 | { |
6ce3b4dc | 149 | return atomic_long_read(&fqdir->mem); |
d433673e JDB |
150 | } |
151 | ||
6ce3b4dc | 152 | static inline void sub_frag_mem_limit(struct fqdir *fqdir, long val) |
d433673e | 153 | { |
6ce3b4dc | 154 | atomic_long_sub(val, &fqdir->mem); |
d433673e JDB |
155 | } |
156 | ||
6ce3b4dc | 157 | static inline void add_frag_mem_limit(struct fqdir *fqdir, long val) |
d433673e | 158 | { |
6ce3b4dc | 159 | atomic_long_add(val, &fqdir->mem); |
d433673e JDB |
160 | } |
161 | ||
be991971 HFS |
162 | /* RFC 3168 support : |
163 | * We want to check ECN values of all fragments, do detect invalid combinations. | |
164 | * In ipq->ecn, we store the OR value of each ip4_frag_ecn() fragment value. | |
165 | */ | |
166 | #define IPFRAG_ECN_NOT_ECT 0x01 /* one frag had ECN_NOT_ECT */ | |
167 | #define IPFRAG_ECN_ECT_1 0x02 /* one frag had ECN_ECT_1 */ | |
168 | #define IPFRAG_ECN_ECT_0 0x04 /* one frag had ECN_ECT_0 */ | |
169 | #define IPFRAG_ECN_CE 0x08 /* one frag had ECN_CE */ | |
170 | ||
171 | extern const u8 ip_frag_ecn_table[16]; | |
172 | ||
c23f35d1 PO |
173 | /* Return values of inet_frag_queue_insert() */ |
174 | #define IPFRAG_OK 0 | |
175 | #define IPFRAG_DUP 1 | |
176 | #define IPFRAG_OVERLAP 2 | |
177 | int inet_frag_queue_insert(struct inet_frag_queue *q, struct sk_buff *skb, | |
178 | int offset, int end); | |
179 | void *inet_frag_reasm_prepare(struct inet_frag_queue *q, struct sk_buff *skb, | |
180 | struct sk_buff *parent); | |
181 | void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head, | |
891584f4 | 182 | void *reasm_data, bool try_coalesce); |
c23f35d1 PO |
183 | struct sk_buff *inet_frag_pull_head(struct inet_frag_queue *q); |
184 | ||
5ab11c98 | 185 | #endif |