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

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