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TOMOYO Linux Cross Reference
Linux/include/linux/igmp.h

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  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 

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