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Commit | Line | Data |
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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
4 | * | |
5 | * Authors: | |
113aa838 | 6 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
7 | * |
8 | * Extended to talk the BSD extended IGMP protocol of mrouted 3.6 | |
1da177e4 | 9 | */ |
1da177e4 LT |
10 | #ifndef _LINUX_IGMP_H |
11 | #define _LINUX_IGMP_H | |
12 | ||
1da177e4 | 13 | #include <linux/skbuff.h> |
d7fe0f24 | 14 | #include <linux/timer.h> |
1da177e4 | 15 | #include <linux/in.h> |
ba5ea614 | 16 | #include <linux/ip.h> |
8851ab52 | 17 | #include <linux/refcount.h> |
607ca46e | 18 | #include <uapi/linux/igmp.h> |
1da177e4 | 19 | |
cc32e054 JP |
20 | static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) |
21 | { | |
22 | 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 | ||
d94d9fee | 37 | struct ip_sf_socklist { |
1da177e4 LT |
38 | unsigned int sl_max; |
39 | unsigned int sl_count; | |
c85bb41e | 40 | struct rcu_head rcu; |
ea4d9e72 | 41 | __be32 sl_addr[0]; |
1da177e4 LT |
42 | }; |
43 | ||
44 | #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ | |
63007727 | 45 | (count) * sizeof(__be32)) |
1da177e4 LT |
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 | ||
d94d9fee | 53 | struct ip_mc_socklist { |
1d7138de | 54 | struct ip_mc_socklist __rcu *next_rcu; |
1da177e4 LT |
55 | struct ip_mreqn multi; |
56 | unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ | |
1d7138de | 57 | struct ip_sf_socklist __rcu *sflist; |
c85bb41e | 58 | struct rcu_head rcu; |
1da177e4 LT |
59 | }; |
60 | ||
d94d9fee | 61 | struct ip_sf_list { |
1da177e4 | 62 | struct ip_sf_list *sf_next; |
1da177e4 | 63 | unsigned long sf_count[2]; /* include/exclude counts */ |
0db355d4 | 64 | __be32 sf_inaddr; |
1da177e4 LT |
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 | ||
d94d9fee | 70 | struct ip_mc_list { |
1da177e4 | 71 | struct in_device *interface; |
338fcf98 | 72 | __be32 multiaddr; |
1d7138de | 73 | unsigned int sfmode; |
1da177e4 LT |
74 | struct ip_sf_list *sources; |
75 | struct ip_sf_list *tomb; | |
1da177e4 | 76 | unsigned long sfcount[2]; |
1d7138de ED |
77 | union { |
78 | struct ip_mc_list *next; | |
79 | struct ip_mc_list __rcu *next_rcu; | |
80 | }; | |
e9897071 | 81 | struct ip_mc_list __rcu *next_hash; |
1da177e4 LT |
82 | struct timer_list timer; |
83 | int users; | |
8851ab52 | 84 | refcount_t refcnt; |
1da177e4 LT |
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; | |
1d7138de | 92 | struct rcu_head rcu; |
1da177e4 LT |
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) : \ | |
fb47ddb2 | 99 | ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ |
1da177e4 LT |
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 | ||
ba5ea614 LL |
105 | static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len) |
106 | { | |
107 | if (skb_transport_offset(skb) + ip_transport_len(skb) < len) | |
083b78a9 | 108 | return 0; |
ba5ea614 LL |
109 | |
110 | return pskb_may_pull(skb, len); | |
111 | } | |
112 | ||
2094acbb | 113 | extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto); |
1da177e4 LT |
114 | extern int igmp_rcv(struct sk_buff *); |
115 | extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); | |
6e2059b5 HL |
116 | extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, |
117 | unsigned int mode); | |
1da177e4 LT |
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 group_filter __user *optval, int __user *optlen); | |
60d9b031 DA |
127 | extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, |
128 | int dif, int sdif); | |
1da177e4 LT |
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 *); | |
75c78500 MS |
133 | extern void ip_mc_unmap(struct in_device *); |
134 | extern void ip_mc_remap(struct in_device *); | |
9fb20801 FF |
135 | extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp); |
136 | static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) | |
137 | { | |
138 | 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); | |
8f935bbd | 142 | extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); |
ba5ea614 | 143 | int ip_mc_check_igmp(struct sk_buff *skb); |
a816c7c7 | 144 | |
1da177e4 | 145 | #endif |