diff options
Diffstat (limited to 'include/net/mld.h')
-rw-r--r-- | include/net/mld.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/include/net/mld.h b/include/net/mld.h new file mode 100644 index 0000000000..c073598084 --- /dev/null +++ b/include/net/mld.h @@ -0,0 +1,117 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef LINUX_MLD_H +#define LINUX_MLD_H + +#include <linux/in6.h> +#include <linux/icmpv6.h> + +/* MLDv1 Query/Report/Done */ +struct mld_msg { + struct icmp6hdr mld_hdr; + struct in6_addr mld_mca; +}; + +#define mld_type mld_hdr.icmp6_type +#define mld_code mld_hdr.icmp6_code +#define mld_cksum mld_hdr.icmp6_cksum +#define mld_maxdelay mld_hdr.icmp6_maxdelay +#define mld_reserved mld_hdr.icmp6_dataun.un_data16[1] + +/* Multicast Listener Discovery version 2 headers */ +/* MLDv2 Report */ +struct mld2_grec { + __u8 grec_type; + __u8 grec_auxwords; + __be16 grec_nsrcs; + struct in6_addr grec_mca; + struct in6_addr grec_src[]; +}; + +struct mld2_report { + struct icmp6hdr mld2r_hdr; + struct mld2_grec mld2r_grec[]; +}; + +#define mld2r_type mld2r_hdr.icmp6_type +#define mld2r_resv1 mld2r_hdr.icmp6_code +#define mld2r_cksum mld2r_hdr.icmp6_cksum +#define mld2r_resv2 mld2r_hdr.icmp6_dataun.un_data16[0] +#define mld2r_ngrec mld2r_hdr.icmp6_dataun.un_data16[1] + +/* MLDv2 Query */ +struct mld2_query { + struct icmp6hdr mld2q_hdr; + struct in6_addr mld2q_mca; +#if defined(__LITTLE_ENDIAN_BITFIELD) + __u8 mld2q_qrv:3, + mld2q_suppress:1, + mld2q_resv2:4; +#elif defined(__BIG_ENDIAN_BITFIELD) + __u8 mld2q_resv2:4, + mld2q_suppress:1, + mld2q_qrv:3; +#else +#error "Please fix <asm/byteorder.h>" +#endif + __u8 mld2q_qqic; + __be16 mld2q_nsrcs; + struct in6_addr mld2q_srcs[]; +}; + +#define mld2q_type mld2q_hdr.icmp6_type +#define mld2q_code mld2q_hdr.icmp6_code +#define mld2q_cksum mld2q_hdr.icmp6_cksum +#define mld2q_mrc mld2q_hdr.icmp6_maxdelay +#define mld2q_resv1 mld2q_hdr.icmp6_dataun.un_data16[1] + +/* RFC3810, 5.1.3. Maximum Response Code: + * + * If Maximum Response Code >= 32768, Maximum Response Code represents a + * floating-point value as follows: + * + * 0 1 2 3 4 5 6 7 8 9 A B C D E F + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * |1| exp | mant | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + */ +#define MLDV2_MRC_EXP(value) (((value) >> 12) & 0x0007) +#define MLDV2_MRC_MAN(value) ((value) & 0x0fff) + +/* RFC3810, 5.1.9. QQIC (Querier's Query Interval Code): + * + * If QQIC >= 128, QQIC represents a floating-point value as follows: + * + * 0 1 2 3 4 5 6 7 + * +-+-+-+-+-+-+-+-+ + * |1| exp | mant | + * +-+-+-+-+-+-+-+-+ + */ +#define MLDV2_QQIC_EXP(value) (((value) >> 4) & 0x07) +#define MLDV2_QQIC_MAN(value) ((value) & 0x0f) + +#define MLD_EXP_MIN_LIMIT 32768UL +#define MLDV1_MRD_MAX_COMPAT (MLD_EXP_MIN_LIMIT - 1) + +#define MLD_MAX_QUEUE 8 +#define MLD_MAX_SKBS 32 + +static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2) +{ + /* RFC3810, 5.1.3. Maximum Response Code */ + unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc); + + if (mc_mrc < MLD_EXP_MIN_LIMIT) { + ret = mc_mrc; + } else { + unsigned long mc_man, mc_exp; + + mc_exp = MLDV2_MRC_EXP(mc_mrc); + mc_man = MLDV2_MRC_MAN(mc_mrc); + + ret = (mc_man | 0x1000) << (mc_exp + 3); + } + + return ret; +} + +#endif |