1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * Authors: 5 * Alan Cox <[email protected]> 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