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