Line data Source code
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 :
20 0 : static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
21 : {
22 0 : return (struct igmphdr *)skb_transport_header(skb);
23 : }
24 :
25 : static 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 :
31 : static 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 :
37 : struct 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_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
45 : (count) * sizeof(__be32))
46 :
47 : #define IP_SFBLOCK 10 /* allocate this many at once */
48 :
49 : /* ip_mc_socklist is real list now. Speed is not argument;
50 : this list never used in fast path code
51 : */
52 :
53 : struct ip_mc_socklist {
54 : struct ip_mc_socklist __rcu *next_rcu;
55 : struct ip_mreqn multi;
56 : unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
57 : struct ip_sf_socklist __rcu *sflist;
58 : struct rcu_head rcu;
59 : };
60 :
61 : struct ip_sf_list {
62 : struct ip_sf_list *sf_next;
63 : unsigned long sf_count[2]; /* include/exclude counts */
64 : __be32 sf_inaddr;
65 : unsigned char sf_gsresp; /* include in g & s response? */
66 : unsigned char sf_oldin; /* change state */
67 : unsigned char sf_crcount; /* retrans. left to send */
68 : };
69 :
70 : struct ip_mc_list {
71 : struct in_device *interface;
72 : __be32 multiaddr;
73 : unsigned int sfmode;
74 : struct ip_sf_list *sources;
75 : struct ip_sf_list *tomb;
76 : unsigned long sfcount[2];
77 : union {
78 : struct ip_mc_list *next;
79 : struct ip_mc_list __rcu *next_rcu;
80 : };
81 : struct ip_mc_list __rcu *next_hash;
82 : struct timer_list timer;
83 : int users;
84 : refcount_t refcnt;
85 : spinlock_t lock;
86 : char tm_running;
87 : char reporter;
88 : char unsolicit_count;
89 : char loaded;
90 : unsigned char gsquery; /* check source marks? */
91 : unsigned char crcount;
92 : struct rcu_head rcu;
93 : };
94 :
95 : /* V3 exponential field decoding */
96 : #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
97 : #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
98 : ((value) < (thresh) ? (value) : \
99 : ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
100 : (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
101 :
102 : #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
103 : #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
104 :
105 0 : static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len)
106 : {
107 0 : if (skb_transport_offset(skb) + ip_transport_len(skb) < len)
108 : return 0;
109 :
110 0 : return pskb_may_pull(skb, len);
111 : }
112 :
113 : extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);
114 : extern int igmp_rcv(struct sk_buff *);
115 : extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
116 : extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
117 : unsigned int mode);
118 : extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
119 : extern void ip_mc_drop_socket(struct sock *sk);
120 : extern int ip_mc_source(int add, int omode, struct sock *sk,
121 : struct ip_mreq_source *mreqs, int ifindex);
122 : extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
123 : extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
124 : struct ip_msfilter __user *optval, int __user *optlen);
125 : extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
126 : struct sockaddr_storage __user *p);
127 : extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt,
128 : int dif, int sdif);
129 : extern void ip_mc_init_dev(struct in_device *);
130 : extern void ip_mc_destroy_dev(struct in_device *);
131 : extern void ip_mc_up(struct in_device *);
132 : extern void ip_mc_down(struct in_device *);
133 : extern void ip_mc_unmap(struct in_device *);
134 : extern void ip_mc_remap(struct in_device *);
135 : extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp);
136 0 : static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
137 : {
138 0 : return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL);
139 : }
140 : extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
141 : gfp_t gfp);
142 : extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
143 : int ip_mc_check_igmp(struct sk_buff *skb);
144 :
145 : #endif
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