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_max_memberships; 41 extern int sysctl_igmp_max_msf; 42 extern int sysctl_igmp_qrv; 43 44 struct ip_sf_socklist { 45 unsigned int sl_max; 46 unsigned int sl_count; 47 struct rcu_head rcu; 48 __be32 sl_addr[0]; 49 }; 50 51 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ 52 (count) * sizeof(__be32)) 53 54 #define IP_SFBLOCK 10 /* allocate this many at once */ 55 56 /* ip_mc_socklist is real list now. Speed is not argument; 57 this list never used in fast path code 58 */ 59 60 struct ip_mc_socklist { 61 struct ip_mc_socklist __rcu *next_rcu; 62 struct ip_mreqn multi; 63 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ 64 struct ip_sf_socklist __rcu *sflist; 65 struct rcu_head rcu; 66 }; 67 68 struct ip_sf_list { 69 struct ip_sf_list *sf_next; 70 __be32 sf_inaddr; 71 unsigned long sf_count[2]; /* include/exclude counts */ 72 unsigned char sf_gsresp; /* include in g & s response? */ 73 unsigned char sf_oldin; /* change state */ 74 unsigned char sf_crcount; /* retrans. left to send */ 75 }; 76 77 struct ip_mc_list { 78 struct in_device *interface; 79 __be32 multiaddr; 80 unsigned int sfmode; 81 struct ip_sf_list *sources; 82 struct ip_sf_list *tomb; 83 unsigned long sfcount[2]; 84 union { 85 struct ip_mc_list *next; 86 struct ip_mc_list __rcu *next_rcu; 87 }; 88 struct ip_mc_list __rcu *next_hash; 89 struct timer_list timer; 90 int users; 91 atomic_t refcnt; 92 spinlock_t lock; 93 char tm_running; 94 char reporter; 95 char unsolicit_count; 96 char loaded; 97 unsigned char gsquery; /* check source marks? */ 98 unsigned char crcount; 99 struct rcu_head rcu; 100 }; 101 102 /* V3 exponential field decoding */ 103 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 104 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ 105 ((value) < (thresh) ? (value) : \ 106 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ 107 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 108 109 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) 110 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) 111 112 extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); 113 extern int igmp_rcv(struct sk_buff *); 114 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); 115 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); 116 extern void ip_mc_drop_socket(struct sock *sk); 117 extern int ip_mc_source(int add, int omode, struct sock *sk, 118 struct ip_mreq_source *mreqs, int ifindex); 119 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); 120 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 121 struct ip_msfilter __user *optval, int __user *optlen); 122 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 123 struct group_filter __user *optval, int __user *optlen); 124 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif); 125 extern void ip_mc_init_dev(struct in_device *); 126 extern void ip_mc_destroy_dev(struct in_device *); 127 extern void ip_mc_up(struct in_device *); 128 extern void ip_mc_down(struct in_device *); 129 extern void ip_mc_unmap(struct in_device *); 130 extern void ip_mc_remap(struct in_device *); 131 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr); 132 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); 133 134 #endif 135