ipv6 mcast: Introduce include/net/mld.h for MLD definitions.

[mirror_ubuntu-bionic-kernel.git] / include / net / mld.h

diff --git a/include/net/mld.h b/include/net/mld.h
new file mode 100644 (file)
index 0000000..467143c
--- /dev/null
+++ b/include/net/mld.h
@@ -0,0 +1,75 @@
+#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[0];
+};
+
+struct mld2_report {
+       struct icmp6hdr         mld2r_hdr;
+       struct mld2_grec        mld2r_grec[0];
+};
+
+#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[0];
+};
+
+#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]
+
+/* Max Response Code */
+#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
+#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
+       ((value) < (thresh) ? (value) : \
+       ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
+       (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
+
+#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
+
+#endif