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142 lines
4.3 KiB
142 lines
4.3 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Linux NET3: Internet Group Management Protocol [IGMP] |
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* |
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* Authors: |
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* Alan Cox <[email protected]> |
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* |
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* Extended to talk the BSD extended IGMP protocol of mrouted 3.6 |
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*/ |
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#ifndef _LINUX_IGMP_H |
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#define _LINUX_IGMP_H |
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#include <linux/skbuff.h> |
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#include <linux/timer.h> |
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#include <linux/in.h> |
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#include <linux/ip.h> |
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#include <linux/refcount.h> |
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#include <uapi/linux/igmp.h> |
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static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) |
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{ |
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return (struct igmphdr *)skb_transport_header(skb); |
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} |
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static inline struct igmpv3_report * |
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igmpv3_report_hdr(const struct sk_buff *skb) |
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{ |
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return (struct igmpv3_report *)skb_transport_header(skb); |
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} |
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static inline struct igmpv3_query * |
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igmpv3_query_hdr(const struct sk_buff *skb) |
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{ |
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return (struct igmpv3_query *)skb_transport_header(skb); |
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} |
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struct ip_sf_socklist { |
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unsigned int sl_max; |
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unsigned int sl_count; |
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struct rcu_head rcu; |
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__be32 sl_addr[]; |
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}; |
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#define IP_SFBLOCK 10 /* allocate this many at once */ |
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/* ip_mc_socklist is real list now. Speed is not argument; |
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this list never used in fast path code |
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*/ |
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struct ip_mc_socklist { |
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struct ip_mc_socklist __rcu *next_rcu; |
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struct ip_mreqn multi; |
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unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ |
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struct ip_sf_socklist __rcu *sflist; |
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struct rcu_head rcu; |
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}; |
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struct ip_sf_list { |
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struct ip_sf_list *sf_next; |
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unsigned long sf_count[2]; /* include/exclude counts */ |
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__be32 sf_inaddr; |
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unsigned char sf_gsresp; /* include in g & s response? */ |
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unsigned char sf_oldin; /* change state */ |
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unsigned char sf_crcount; /* retrans. left to send */ |
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}; |
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struct ip_mc_list { |
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struct in_device *interface; |
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__be32 multiaddr; |
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unsigned int sfmode; |
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struct ip_sf_list *sources; |
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struct ip_sf_list *tomb; |
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unsigned long sfcount[2]; |
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union { |
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struct ip_mc_list *next; |
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struct ip_mc_list __rcu *next_rcu; |
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}; |
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struct ip_mc_list __rcu *next_hash; |
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struct timer_list timer; |
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int users; |
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refcount_t refcnt; |
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spinlock_t lock; |
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char tm_running; |
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char reporter; |
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char unsolicit_count; |
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char loaded; |
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unsigned char gsquery; /* check source marks? */ |
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unsigned char crcount; |
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struct rcu_head rcu; |
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}; |
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/* V3 exponential field decoding */ |
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#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) |
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#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ |
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((value) < (thresh) ? (value) : \ |
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((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ |
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(IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) |
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#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) |
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#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) |
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static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len) |
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{ |
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if (skb_transport_offset(skb) + ip_transport_len(skb) < len) |
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return 0; |
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return pskb_may_pull(skb, len); |
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} |
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extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto); |
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extern int igmp_rcv(struct sk_buff *); |
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extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); |
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extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, |
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unsigned int mode); |
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extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); |
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extern void ip_mc_drop_socket(struct sock *sk); |
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extern int ip_mc_source(int add, int omode, struct sock *sk, |
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struct ip_mreq_source *mreqs, int ifindex); |
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extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); |
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extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
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sockptr_t optval, sockptr_t optlen); |
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extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
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sockptr_t optval, size_t offset); |
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extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, |
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int dif, int sdif); |
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extern void ip_mc_init_dev(struct in_device *); |
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extern void ip_mc_destroy_dev(struct in_device *); |
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extern void ip_mc_up(struct in_device *); |
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extern void ip_mc_down(struct in_device *); |
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extern void ip_mc_unmap(struct in_device *); |
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extern void ip_mc_remap(struct in_device *); |
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extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp); |
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static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
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{ |
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return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL); |
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} |
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extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
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gfp_t gfp); |
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extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); |
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int ip_mc_check_igmp(struct sk_buff *skb); |
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#endif
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