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commit 68c6b90942c1849aaea46da3d90828a1868988ae Author: Marco Casaroli <[email protected]> AuthorDate: Tue Oct 27 23:17:20 2026 +0100 include/netinet/in.h: Add IN_LOOPBACKNET, IN_EXPERIMENTAL() and IN_BADCLASS(). <netinet/in.h> had the classful address macros of 4.4BSD but not these three. glibc, musl and the BSDs have them, and programs use them (openssh's sshconnect.c tests for IN_LOOPBACKNET). Assisted-by: Claude Code:claude-opus-5-5 Signed-off-by: Marco Casaroli <[email protected]> --- include/netinet/in.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/netinet/in.h b/include/netinet/in.h index 927a022d9c2..a2fb86f7214 100644 --- a/include/netinet/in.h +++ b/include/netinet/in.h @@ -153,6 +153,8 @@ #define IN_CLASSA_HOST (0xffffffff & ~IN_CLASSA_NET) #define IN_CLASSA_MAX 128 +#define IN_LOOPBACKNET 127 /* The loopback network, 127/8 */ + #define IN_CLASSB(a) ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000) #define IN_CLASSB_NET 0xffff0000 #define IN_CLASSB_NSHIFT 16 @@ -169,6 +171,11 @@ #define IN_CLASSD(i) (((in_addr_t)(i) & 0xf0000000) == 0xe0000000) #define IN_MULTICAST(i) IN_CLASSD(i) +/* Experimental (224/3) and reserved (240/4) addresses, as in glibc */ + +#define IN_EXPERIMENTAL(a) (((in_addr_t)(a) & 0xe0000000) == 0xe0000000) +#define IN_BADCLASS(a) (((in_addr_t)(a) & 0xf0000000) == 0xf0000000) + /* Special values of in_addr_t */ #define INADDR_ANY ((in_addr_t)0x00000000) /* Address to accept any
