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 43 struct ip_sf_socklist { 44 unsigned int sl_max; 45 unsigned int sl_count; 46 struct rcu_head rcu; 47 __be32 sl_addr[0]; 48 }; 49 50 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ 51 (count) * sizeof(__be32)) 52 53 #define IP_SFBLOCK 10 /* allocate this many at once */ 54 55 /* ip_mc_socklist is real list now. Speed is not argument; 56 this list never used in fast path code 57 */ 58 59 struct ip_mc_socklist { 60 struct ip_mc_socklist __rcu *next_rcu; 61 struct ip_mreqn multi; 62 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ 63 struct ip_sf_socklist __rcu *sflist; 64 struct rcu_head rcu; 65 }; 66 67 struct ip_sf_list { 68 struct ip_sf_list *sf_next; 69 __be32 sf_inaddr; 70 unsigned long sf_count[2]; /* include/exclude counts */ 71 unsigned char sf_gsresp; /* include in g & s response? */ 72 unsigned char sf_oldin; /* change state */ 73 unsigned char sf_crcount; /* retrans. left to send */ 74 }; 75 76 struct ip_mc_list { 77 struct in_device *interface; 78 __be32 multiaddr; 79 unsigned int sfmode; 80 struct ip_sf_list *sources; 81 struct ip_sf_list *tomb; 82 unsigned long sfcount[2]; 83 union { 84 struct ip_mc_list *next; 85 struct ip_mc_list __rcu *next_rcu; 86 }; 87 struct timer_list timer; 88 int users; 89 atomic_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 extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); 111 extern int igmp_rcv(struct sk_buff *); 112 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); 113 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); 114 extern void ip_mc_drop_socket(struct sock *sk); 115 extern int ip_mc_source(int add, int omode, struct sock *sk, 116 struct ip_mreq_source *mreqs, int ifindex); 117 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); 118 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 119 struct ip_msfilter __user *optval, int __user *optlen); 120 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 121 struct group_filter __user *optval, int __user *optlen); 122 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif); 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 extern void ip_mc_rejoin_groups(struct in_device *in_dev); 132 133 #endif 134