| /* 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_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ |
| (count) * sizeof(__be32)) |
| |
| #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, |
| struct ip_msfilter __user *optval, int __user *optlen); |
| extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, |
| struct sockaddr_storage __user *p); |
| 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 |