diff options
Diffstat (limited to 'include/linux/igmp.h')
| -rw-r--r-- | include/linux/igmp.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/include/linux/igmp.h b/include/linux/igmp.h new file mode 100644 index 000000000..78890143f --- /dev/null +++ b/include/linux/igmp.h @@ -0,0 +1,142 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Linux NET3: Internet Group Management Protocol [IGMP] + * + * Authors: + * Alan Cox <alan@lxorguk.ukuu.org.uk> + * + * Extended to talk the BSD extended IGMP protocol of mrouted 3.6 + */ +#ifndef _LINUX_IGMP_H +#define _LINUX_IGMP_H + +#include <linux/skbuff.h> +#include <linux/timer.h> +#include <linux/in.h> +#include <linux/ip.h> +#include <linux/refcount.h> +#include <uapi/linux/igmp.h> + +static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) +{ + return (struct igmphdr *)skb_transport_header(skb); +} + +static inline struct igmpv3_report * + igmpv3_report_hdr(const struct sk_buff *skb) +{ + return (struct igmpv3_report *)skb_transport_header(skb); +} + +static inline struct igmpv3_query * + igmpv3_query_hdr(const struct sk_buff *skb) +{ + return (struct igmpv3_query *)skb_transport_header(skb); +} + +struct ip_sf_socklist { + unsigned int sl_max; + unsigned int sl_count; + struct rcu_head rcu; + __be32 sl_addr[]; +}; + +#define IP_SFBLOCK 10 /* allocate this many at once */ + +/* ip_mc_socklist is real list now. Speed is not argument; + this list never used in fast path code + */ + +struct ip_mc_socklist { + struct ip_mc_socklist __rcu *next_rcu; + struct ip_mreqn multi; + unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ + struct ip_sf_socklist __rcu *sflist; + struct rcu_head rcu; +}; + +struct ip_sf_list { + struct ip_sf_list *sf_next; + unsigned long sf_count[2]; /* include/exclude counts */ + __be32 sf_inaddr; + unsigned char sf_gsresp; /* include in g & s response? */ + unsigned char sf_oldin; /* change state */ + unsigned char sf_crcount; /* retrans. left to send */ +}; + +struct ip_mc_list { + struct in_device *interface; + __be32 multiaddr; + unsigned int sfmode; + struct ip_sf_list *sources; + struct ip_sf_list *tomb; + unsigned long sfcount[2]; + union { + struct ip_mc_list *next; + struct ip_mc_list __rcu *next_rcu; + }; + struct ip_mc_list __rcu *next_hash; + struct timer_list timer; + int users; + refcount_t refcnt; + spinlock_t lock; + char tm_running; + char reporter; + char unsolicit_count; + char loaded; + unsigned char gsquery; /* check source marks? */ + unsigned char crcount; + struct rcu_head rcu; +}; + +/* V3 exponential field decoding */ +#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) +#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ + ((value) < (thresh) ? (value) : \ + ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ + (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) + +#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) +#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) + +static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len) +{ + if (skb_transport_offset(skb) + ip_transport_len(skb) < len) + return 0; + + return pskb_may_pull(skb, len); +} + +extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto); +extern int igmp_rcv(struct sk_buff *); +extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); +extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, + unsigned int mode); +extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); +extern void ip_mc_drop_socket(struct sock *sk); +extern int ip_mc_source(int add, int omode, struct sock *sk, + struct ip_mreq_source *mreqs, int ifindex); +extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); +extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, + sockptr_t optval, sockptr_t optlen); +extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, + sockptr_t optval, size_t offset); +extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, + int dif, int sdif); +extern void ip_mc_init_dev(struct in_device *); +extern void ip_mc_destroy_dev(struct in_device *); +extern void ip_mc_up(struct in_device *); +extern void ip_mc_down(struct in_device *); +extern void ip_mc_unmap(struct in_device *); +extern void ip_mc_remap(struct in_device *); +extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp); +static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) +{ + return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL); +} +extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, + gfp_t gfp); +extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); +int ip_mc_check_igmp(struct sk_buff *skb); + +#endif |