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Linux/include/linux/igmp.h

  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 <uapi/linux/igmp.h>
 22 
 23 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
 24 {
 25         return (struct igmphdr *)skb_transport_header(skb);
 26 }
 27 
 28 static inline struct igmpv3_report *
 29                         igmpv3_report_hdr(const struct sk_buff *skb)
 30 {
 31         return (struct igmpv3_report *)skb_transport_header(skb);
 32 }
 33 
 34 static inline struct igmpv3_query *
 35                         igmpv3_query_hdr(const struct sk_buff *skb)
 36 {
 37         return (struct igmpv3_query *)skb_transport_header(skb);
 38 }
 39 
 40 extern int sysctl_igmp_llm_reports;
 41 extern int sysctl_igmp_max_memberships;
 42 extern int sysctl_igmp_max_msf;
 43 extern int sysctl_igmp_qrv;
 44 
 45 struct ip_sf_socklist {
 46         unsigned int            sl_max;
 47         unsigned int            sl_count;
 48         struct rcu_head         rcu;
 49         __be32                  sl_addr[0];
 50 };
 51 
 52 #define IP_SFLSIZE(count)       (sizeof(struct ip_sf_socklist) + \
 53         (count) * sizeof(__be32))
 54 
 55 #define IP_SFBLOCK      10      /* allocate this many at once */
 56 
 57 /* ip_mc_socklist is real list now. Speed is not argument;
 58    this list never used in fast path code
 59  */
 60 
 61 struct ip_mc_socklist {
 62         struct ip_mc_socklist __rcu *next_rcu;
 63         struct ip_mreqn         multi;
 64         unsigned int            sfmode;         /* MCAST_{INCLUDE,EXCLUDE} */
 65         struct ip_sf_socklist __rcu     *sflist;
 66         struct rcu_head         rcu;
 67 };
 68 
 69 struct ip_sf_list {
 70         struct ip_sf_list       *sf_next;
 71         __be32                  sf_inaddr;
 72         unsigned long           sf_count[2];    /* include/exclude counts */
 73         unsigned char           sf_gsresp;      /* include in g & s response? */
 74         unsigned char           sf_oldin;       /* change state */
 75         unsigned char           sf_crcount;     /* retrans. left to send */
 76 };
 77 
 78 struct ip_mc_list {
 79         struct in_device        *interface;
 80         __be32                  multiaddr;
 81         unsigned int            sfmode;
 82         struct ip_sf_list       *sources;
 83         struct ip_sf_list       *tomb;
 84         unsigned long           sfcount[2];
 85         union {
 86                 struct ip_mc_list *next;
 87                 struct ip_mc_list __rcu *next_rcu;
 88         };
 89         struct ip_mc_list __rcu *next_hash;
 90         struct timer_list       timer;
 91         int                     users;
 92         atomic_t                refcnt;
 93         spinlock_t              lock;
 94         char                    tm_running;
 95         char                    reporter;
 96         char                    unsolicit_count;
 97         char                    loaded;
 98         unsigned char           gsquery;        /* check source marks? */
 99         unsigned char           crcount;
100         struct rcu_head         rcu;
101 };
102 
103 /* V3 exponential field decoding */
104 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
105 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
106         ((value) < (thresh) ? (value) : \
107         ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
108          (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
109 
110 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
111 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
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_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                 struct ip_msfilter __user *optval, int __user *optlen);
123 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
124                 struct group_filter __user *optval, int __user *optlen);
125 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
126 extern void ip_mc_init_dev(struct in_device *);
127 extern void ip_mc_destroy_dev(struct in_device *);
128 extern void ip_mc_up(struct in_device *);
129 extern void ip_mc_down(struct in_device *);
130 extern void ip_mc_unmap(struct in_device *);
131 extern void ip_mc_remap(struct in_device *);
132 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
133 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
134 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed);
135 
136 #endif
137 

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