| | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| | 2 | /* |
| | 3 | * Linux NET3: Internet Group Management Protocol [IGMP] |
| | 4 | * |
| | 5 | * Authors: |
| | 6 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
| | 7 | * |
| | 8 | * Extended to talk the BSD extended IGMP protocol of mrouted 3.6 |
| | 9 | */ |
| | 10 | #ifndef _LINUX_IGMP_H |
| | 11 | #define _LINUX_IGMP_H |
| | 12 | |
| | 13 | #include <linux/skbuff.h> |
| | 14 | #include <linux/timer.h> |
| | 15 | #include <linux/in.h> |
| | 16 | #include <linux/ip.h> |
| | 17 | #include <linux/refcount.h> |
| | 18 | #include <linux/sockptr.h> |
| | 19 | #include <uapi/linux/igmp.h> |
| | 20 | |
| | 21 | static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) |
| | 22 | { |
| | 23 | return (struct igmphdr *)skb_transport_header(skb); |
| | 24 | } |
| | 25 | |
| | 26 | static inline struct igmpv3_report * |
| | 27 | igmpv3_report_hdr(const struct sk_buff *skb) |
| | 28 | { |
| | 29 | return (struct igmpv3_report *)skb_transport_header(skb); |
| | 30 | } |
| | 31 | |
| | 32 | static inline struct igmpv3_query * |
| | 33 | igmpv3_query_hdr(const struct sk_buff *skb) |
| | 34 | { |
| | 35 | return (struct igmpv3_query *)skb_transport_header(skb); |
| | 36 | } |
| | 37 | |
| | 38 | struct ip_sf_socklist { |
| | 39 | unsigned int sl_max; |
| | 40 | unsigned int sl_count; |
| | 41 | struct rcu_head rcu; |
| | 42 | __be32 sl_addr[] __counted_by(sl_max); |
| | 43 | }; |
| | 44 | |
| | 45 | #define IP_SFBLOCK 10 /* allocate this many at once */ |
| | 46 | |
| | 47 | /* ip_mc_socklist is real list now. Speed is not argument; |
| | 48 | this list never used in fast path code |
| | 49 | */ |
| | 50 | |
| | 51 | struct ip_mc_socklist { |
| | 52 | struct ip_mc_socklist __rcu *next_rcu; |
| | 53 | struct ip_mreqn multi; |
| | 54 | unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ |
| | 55 | struct ip_sf_socklist __rcu *sflist; |
| | 56 | struct rcu_head rcu; |
| | 57 | }; |
| | 58 | |
| | 59 | struct ip_sf_list { |
| | 60 | struct ip_sf_list *sf_next; |
| | 61 | unsigned long sf_count[2]; /* include/exclude counts */ |
| | 62 | __be32 sf_inaddr; |
| | 63 | unsigned char sf_gsresp; /* include in g & s response? */ |
| | 64 | unsigned char sf_oldin; /* change state */ |
| | 65 | unsigned char sf_crcount; /* retrans. left to send */ |
| | 66 | }; |
| | 67 | |
| | 68 | struct ip_mc_list { |
| | 69 | struct in_device *interface; |
| | 70 | __be32 multiaddr; |
| | 71 | unsigned int sfmode; |
| | 72 | struct ip_sf_list *sources; |
| | 73 | struct ip_sf_list *tomb; |
| | 74 | unsigned long sfcount[2]; |
| | 75 | union { |
| | 76 | struct ip_mc_list *next; |
| | 77 | struct ip_mc_list __rcu *next_rcu; |
| | 78 | }; |
| | 79 | struct ip_mc_list __rcu *next_hash; |
| | 80 | struct timer_list timer; |
| | 81 | int users; |
| | 82 | refcount_t refcnt; |
| | 83 | spinlock_t lock; |
| | 84 | char tm_running; |
| | 85 | char reporter; |
| | 86 | char unsolicit_count; |
| | 87 | char loaded; |
| | 88 | unsigned char gsquery; /* check source marks? */ |
| | 89 | unsigned char crcount; |
| | 90 | unsigned long mca_cstamp; |
| | 91 | unsigned long mca_tstamp; |
| | 92 | struct rcu_head rcu; |
| | 93 | }; |
| | 94 | |
| | 95 | /* V3 exponential field decoding */ |
| | 96 | #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) |
| | 97 | #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ |
| | 98 | ((value) < (thresh) ? (value) : \ |
| | 99 | ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ |
| | 100 | (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) |
| | 101 | |
| | 102 | #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) |
| | 103 | #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) |
| | 104 | |
| | 105 | static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len) |
| | 106 | { |
| | 107 | if (skb_transport_offset(skb) + ip_transport_len(skb) < len) |
| | 108 | return 0; |
| | 109 | |
| | 110 | return pskb_may_pull(skb, len); |
| | 111 | } |
| | 112 | |
| | 113 | extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto); |
| | 114 | extern int igmp_rcv(struct sk_buff *); |
| | 115 | extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); |
| | 116 | extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, |
| | 117 | unsigned int mode); |
| | 118 | extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); |
| | 119 | extern void ip_mc_drop_socket(struct sock *sk); |
| | 120 | extern int ip_mc_source(int add, int omode, struct sock *sk, |
| | 121 | struct ip_mreq_source *mreqs, int ifindex); |
| | 122 | extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); |
| | 123 | extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
| | 124 | sockptr_t optval, sockptr_t optlen); |
| | 125 | extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
| | 126 | sockptr_t optval, size_t offset); |
| | 127 | extern int ip_mc_sf_allow(const struct sock *sk, __be32 local, __be32 rmt, |
| | 128 | int dif, int sdif); |
| | 129 | extern void ip_mc_init_dev(struct in_device *); |
| | 130 | extern void ip_mc_destroy_dev(struct in_device *); |
| | 131 | extern void ip_mc_up(struct in_device *); |
| | 132 | extern void ip_mc_down(struct in_device *); |
| | 133 | extern void ip_mc_unmap(struct in_device *); |
| | 134 | extern void ip_mc_remap(struct in_device *); |
| | 135 | extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp); |
| | 136 | static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
| | 137 | { |
| | 138 | return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL); |
| | 139 | } |
| | 140 | extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
| | 141 | gfp_t gfp); |
| | 142 | extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); |
| | 143 | int ip_mc_check_igmp(struct sk_buff *skb); |
| | 144 | |
| | 145 | #endif |
projects / linux-2.6-block.git / blame_incremental