1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] |
3 | * |
4 | * Authors: |
5 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
6 | * |
7 | * Extended to talk the BSD extended IGMP protocol of mrouted 3.6 |
8 | * |
9 | * |
10 | * This program is free software; you can redistribute it and/or |
11 | * modify it under the terms of the GNU General Public License |
12 | * as published by the Free Software Foundation; either version |
13 | * 2 of the License, or (at your option) any later version. |
14 | */ |
15 | #ifndef _LINUX_IGMP_H |
16 | #define _LINUX_IGMP_H |
17 | |
18 | #include <linux/skbuff.h> |
19 | #include <linux/timer.h> |
20 | #include <linux/in.h> |
21 | #include <linux/ip.h> |
22 | #include <linux/refcount.h> |
23 | #include <uapi/linux/igmp.h> |
24 | |
25 | static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) |
26 | { |
27 | return (struct igmphdr *)skb_transport_header(skb); |
28 | } |
29 | |
30 | static inline struct igmpv3_report * |
31 | igmpv3_report_hdr(const struct sk_buff *skb) |
32 | { |
33 | return (struct igmpv3_report *)skb_transport_header(skb); |
34 | } |
35 | |
36 | static inline struct igmpv3_query * |
37 | igmpv3_query_hdr(const struct sk_buff *skb) |
38 | { |
39 | return (struct igmpv3_query *)skb_transport_header(skb); |
40 | } |
41 | |
42 | struct ip_sf_socklist { |
43 | unsigned int sl_max; |
44 | unsigned int sl_count; |
45 | struct rcu_head rcu; |
46 | __be32 sl_addr[0]; |
47 | }; |
48 | |
49 | #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ |
50 | (count) * sizeof(__be32)) |
51 | |
52 | #define IP_SFBLOCK 10 /* allocate this many at once */ |
53 | |
54 | /* ip_mc_socklist is real list now. Speed is not argument; |
55 | this list never used in fast path code |
56 | */ |
57 | |
58 | struct ip_mc_socklist { |
59 | struct ip_mc_socklist __rcu *next_rcu; |
60 | struct ip_mreqn multi; |
61 | unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ |
62 | struct ip_sf_socklist __rcu *sflist; |
63 | struct rcu_head rcu; |
64 | }; |
65 | |
66 | struct ip_sf_list { |
67 | struct ip_sf_list *sf_next; |
68 | __be32 sf_inaddr; |
69 | unsigned long sf_count[2]; /* include/exclude counts */ |
70 | unsigned char sf_gsresp; /* include in g & s response? */ |
71 | unsigned char sf_oldin; /* change state */ |
72 | unsigned char sf_crcount; /* retrans. left to send */ |
73 | }; |
74 | |
75 | struct ip_mc_list { |
76 | struct in_device *interface; |
77 | __be32 multiaddr; |
78 | unsigned int sfmode; |
79 | struct ip_sf_list *sources; |
80 | struct ip_sf_list *tomb; |
81 | unsigned long sfcount[2]; |
82 | union { |
83 | struct ip_mc_list *next; |
84 | struct ip_mc_list __rcu *next_rcu; |
85 | }; |
86 | struct ip_mc_list __rcu *next_hash; |
87 | struct timer_list timer; |
88 | int users; |
89 | refcount_t refcnt; |
90 | spinlock_t lock; |
91 | char tm_running; |
92 | char reporter; |
93 | char unsolicit_count; |
94 | char loaded; |
95 | unsigned char gsquery; /* check source marks? */ |
96 | unsigned char crcount; |
97 | struct rcu_head rcu; |
98 | }; |
99 | |
100 | /* V3 exponential field decoding */ |
101 | #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) |
102 | #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ |
103 | ((value) < (thresh) ? (value) : \ |
104 | ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ |
105 | (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) |
106 | |
107 | #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) |
108 | #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) |
109 | |
110 | static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len) |
111 | { |
112 | if (skb_transport_offset(skb) + ip_transport_len(skb) < len) |
113 | return 0; |
114 | |
115 | return pskb_may_pull(skb, len); |
116 | } |
117 | |
118 | extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto); |
119 | extern int igmp_rcv(struct sk_buff *); |
120 | extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); |
121 | extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, |
122 | unsigned int mode); |
123 | extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); |
124 | extern void ip_mc_drop_socket(struct sock *sk); |
125 | extern int ip_mc_source(int add, int omode, struct sock *sk, |
126 | struct ip_mreq_source *mreqs, int ifindex); |
127 | extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); |
128 | extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
129 | struct ip_msfilter __user *optval, int __user *optlen); |
130 | extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
131 | struct group_filter __user *optval, int __user *optlen); |
132 | extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, |
133 | int dif, int sdif); |
134 | extern void ip_mc_init_dev(struct in_device *); |
135 | extern void ip_mc_destroy_dev(struct in_device *); |
136 | extern void ip_mc_up(struct in_device *); |
137 | extern void ip_mc_down(struct in_device *); |
138 | extern void ip_mc_unmap(struct in_device *); |
139 | extern void ip_mc_remap(struct in_device *); |
140 | extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp); |
141 | static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
142 | { |
143 | return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL); |
144 | } |
145 | extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
146 | gfp_t gfp); |
147 | extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); |
148 | int ip_mc_check_igmp(struct sk_buff *skb); |
149 | |
150 | #endif |
151 | |