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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Linux NET3: Internet Group Management Protocol [IGMP]
4 *
5 * Authors:
6 * Alan Cox <alan@lxorguk.ukuu.org.uk>
7 *
8 * Extended to talk the BSD extended IGMP protocol of mrouted 3.6
9 */
10#ifndef _LINUX_IGMP_H
11#define _LINUX_IGMP_H
12
13#include <linux/skbuff.h>
14#include <linux/timer.h>
15#include <linux/in.h>
16#include <linux/ip.h>
17#include <linux/refcount.h>
18#include <uapi/linux/igmp.h>
19
20static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
21{
22 return (struct igmphdr *)skb_transport_header(skb);
23}
24
25static inline struct igmpv3_report *
26 igmpv3_report_hdr(const struct sk_buff *skb)
27{
28 return (struct igmpv3_report *)skb_transport_header(skb);
29}
30
31static inline struct igmpv3_query *
32 igmpv3_query_hdr(const struct sk_buff *skb)
33{
34 return (struct igmpv3_query *)skb_transport_header(skb);
35}
36
37struct ip_sf_socklist {
38 unsigned int sl_max;
39 unsigned int sl_count;
40 struct rcu_head rcu;
41 __be32 sl_addr[];
42};
43
44#define IP_SFBLOCK 10 /* allocate this many at once */
45
46/* ip_mc_socklist is real list now. Speed is not argument;
47 this list never used in fast path code
48 */
49
50struct ip_mc_socklist {
51 struct ip_mc_socklist __rcu *next_rcu;
52 struct ip_mreqn multi;
53 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
54 struct ip_sf_socklist __rcu *sflist;
55 struct rcu_head rcu;
56};
57
58struct ip_sf_list {
59 struct ip_sf_list *sf_next;
60 unsigned long sf_count[2]; /* include/exclude counts */
61 __be32 sf_inaddr;
62 unsigned char sf_gsresp; /* include in g & s response? */
63 unsigned char sf_oldin; /* change state */
64 unsigned char sf_crcount; /* retrans. left to send */
65};
66
67struct ip_mc_list {
68 struct in_device *interface;
69 __be32 multiaddr;
70 unsigned int sfmode;
71 struct ip_sf_list *sources;
72 struct ip_sf_list *tomb;
73 unsigned long sfcount[2];
74 union {
75 struct ip_mc_list *next;
76 struct ip_mc_list __rcu *next_rcu;
77 };
78 struct ip_mc_list __rcu *next_hash;
79 struct timer_list timer;
80 int users;
81 refcount_t refcnt;
82 spinlock_t lock;
83 char tm_running;
84 char reporter;
85 char unsolicit_count;
86 char loaded;
87 unsigned char gsquery; /* check source marks? */
88 unsigned char crcount;
89 struct rcu_head rcu;
90};
91
92/* V3 exponential field decoding */
93#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
94#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
95 ((value) < (thresh) ? (value) : \
96 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
97 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
98
99#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
100#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
101
102static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len)
103{
104 if (skb_transport_offset(skb) + ip_transport_len(skb) < len)
105 return 0;
106
107 return pskb_may_pull(skb, len);
108}
109
110extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);
111extern int igmp_rcv(struct sk_buff *);
112extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
113extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
114 unsigned int mode);
115extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
116extern void ip_mc_drop_socket(struct sock *sk);
117extern int ip_mc_source(int add, int omode, struct sock *sk,
118 struct ip_mreq_source *mreqs, int ifindex);
119extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
120extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
121 struct ip_msfilter __user *optval, int __user *optlen);
122extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
123 struct sockaddr_storage __user *p);
124extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt,
125 int dif, int sdif);
126extern void ip_mc_init_dev(struct in_device *);
127extern void ip_mc_destroy_dev(struct in_device *);
128extern void ip_mc_up(struct in_device *);
129extern void ip_mc_down(struct in_device *);
130extern void ip_mc_unmap(struct in_device *);
131extern void ip_mc_remap(struct in_device *);
132extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp);
133static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
134{
135 return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL);
136}
137extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
138 gfp_t gfp);
139extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
140int ip_mc_check_igmp(struct sk_buff *skb);
141
142#endif