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 <linux/sockptr.h> |
19 | #include <uapi/linux/igmp.h> |
20 | |
21 | static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) |
22 | { |
23 | return (struct igmphdr *)skb_transport_header(skb); |
24 | } |
25 | |
26 | static inline struct igmpv3_report * |
27 | igmpv3_report_hdr(const struct sk_buff *skb) |
28 | { |
29 | return (struct igmpv3_report *)skb_transport_header(skb); |
30 | } |
31 | |
32 | static inline struct igmpv3_query * |
33 | igmpv3_query_hdr(const struct sk_buff *skb) |
34 | { |
35 | return (struct igmpv3_query *)skb_transport_header(skb); |
36 | } |
37 | |
38 | struct ip_sf_socklist { |
39 | unsigned int sl_max; |
40 | unsigned int sl_count; |
41 | struct rcu_head rcu; |
42 | __be32 sl_addr[] __counted_by(sl_max); |
43 | }; |
44 | |
45 | #define IP_SFBLOCK 10 /* allocate this many at once */ |
46 | |
47 | /* ip_mc_socklist is real list now. Speed is not argument; |
48 | this list never used in fast path code |
49 | */ |
50 | |
51 | struct ip_mc_socklist { |
52 | struct ip_mc_socklist __rcu *next_rcu; |
53 | struct ip_mreqn multi; |
54 | unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ |
55 | struct ip_sf_socklist __rcu *sflist; |
56 | struct rcu_head rcu; |
57 | }; |
58 | |
59 | struct ip_sf_list { |
60 | struct ip_sf_list *sf_next; |
61 | unsigned long sf_count[2]; /* include/exclude counts */ |
62 | __be32 sf_inaddr; |
63 | unsigned char sf_gsresp; /* include in g & s response? */ |
64 | unsigned char sf_oldin; /* change state */ |
65 | unsigned char sf_crcount; /* retrans. left to send */ |
66 | }; |
67 | |
68 | struct ip_mc_list { |
69 | struct in_device *interface; |
70 | __be32 multiaddr; |
71 | unsigned int sfmode; |
72 | struct ip_sf_list *sources; |
73 | struct ip_sf_list *tomb; |
74 | unsigned long sfcount[2]; |
75 | union { |
76 | struct ip_mc_list *next; |
77 | struct ip_mc_list __rcu *next_rcu; |
78 | }; |
79 | struct ip_mc_list __rcu *next_hash; |
80 | struct timer_list timer; |
81 | int users; |
82 | refcount_t refcnt; |
83 | spinlock_t lock; |
84 | char tm_running; |
85 | char reporter; |
86 | char unsolicit_count; |
87 | char loaded; |
88 | unsigned char gsquery; /* check source marks? */ |
89 | unsigned char crcount; |
90 | struct rcu_head rcu; |
91 | }; |
92 | |
93 | /* V3 exponential field decoding */ |
94 | #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) |
95 | #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ |
96 | ((value) < (thresh) ? (value) : \ |
97 | ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ |
98 | (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) |
99 | |
100 | #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) |
101 | #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) |
102 | |
103 | static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len) |
104 | { |
105 | if (skb_transport_offset(skb) + ip_transport_len(skb) < len) |
106 | return 0; |
107 | |
108 | return pskb_may_pull(skb, len); |
109 | } |
110 | |
111 | extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto); |
112 | extern int igmp_rcv(struct sk_buff *); |
113 | extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); |
114 | extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, |
115 | unsigned int mode); |
116 | extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); |
117 | extern void ip_mc_drop_socket(struct sock *sk); |
118 | extern int ip_mc_source(int add, int omode, struct sock *sk, |
119 | struct ip_mreq_source *mreqs, int ifindex); |
120 | extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); |
121 | extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
122 | sockptr_t optval, sockptr_t optlen); |
123 | extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
124 | sockptr_t optval, size_t offset); |
125 | extern int ip_mc_sf_allow(const struct sock *sk, __be32 local, __be32 rmt, |
126 | int dif, int sdif); |
127 | extern void ip_mc_init_dev(struct in_device *); |
128 | extern void ip_mc_destroy_dev(struct in_device *); |
129 | extern void ip_mc_up(struct in_device *); |
130 | extern void ip_mc_down(struct in_device *); |
131 | extern void ip_mc_unmap(struct in_device *); |
132 | extern void ip_mc_remap(struct in_device *); |
133 | extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp); |
134 | static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
135 | { |
136 | return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL); |
137 | } |
138 | extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
139 | gfp_t gfp); |
140 | extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); |
141 | int ip_mc_check_igmp(struct sk_buff *skb); |
142 | |
143 | #endif |
144 | |