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https://gitlab.nic.cz/labs/bird.git
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1e37e35c3e
Basic support for SAFI 4 and 128 (MPLS labeled IP and VPN) for IPv4 and IPv6. Should work for route reflector, but does not properly handle originating routes with next hop self. Based on patches from Jan Matejka.
105 lines
1.7 KiB
C
105 lines
1.7 KiB
C
/*
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* Unaligned Data Accesses -- Generic Version, Network Order
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*
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* (c) 2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_UNALIGNED_H_
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#define _BIRD_UNALIGNED_H_
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/*
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* We don't do any clever tricks with unaligned accesses since it's
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* virtually impossible to figure out what alignment does the CPU want
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* (unaligned accesses can be emulated by the OS which makes them work,
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* but unusably slow). We use memcpy and hope GCC will optimize it out
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* if possible.
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*/
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#include "sysdep/unix/endian.h"
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#include "lib/string.h"
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static inline u16
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get_u16(const void *p)
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{
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u16 x;
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memcpy(&x, p, 2);
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return ntohs(x);
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}
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static inline u32
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get_u24(const void *P)
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{
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const byte *p = P;
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return (p[0] << 16) + (p[1] << 8) + p[2];
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}
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static inline u32
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get_u32(const void *p)
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{
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u32 x;
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memcpy(&x, p, 4);
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return ntohl(x);
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}
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static inline u64
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get_u64(const void *p)
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{
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u32 xh, xl;
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memcpy(&xh, p, 4);
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memcpy(&xl, p+4, 4);
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return (((u64) ntohl(xh)) << 32) | ntohl(xl);
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}
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static inline void
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put_u16(void *p, u16 x)
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{
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x = htons(x);
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memcpy(p, &x, 2);
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}
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static inline void
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put_u24(void *p, u32 x)
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{
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x = htonl(x);
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memcpy(p, ((char *) &x) + 1, 3);
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}
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static inline void
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put_u32(void *p, u32 x)
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{
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x = htonl(x);
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memcpy(p, &x, 4);
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}
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static inline void
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put_u64(void *p, u64 x)
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{
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u32 xh, xl;
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xh = htonl(x >> 32);
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xl = htonl((u32) x);
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memcpy(p, &xh, 4);
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memcpy(p+4, &xl, 4);
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}
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static inline void
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get_u32s(const void *p, u32 *x, int n)
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{
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int i;
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memcpy(x, p, 4*n);
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for (i = 0; i < n; i++)
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x[i] = ntohl(x[i]);
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}
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static inline void
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put_u32s(void *p, const u32 *x, int n)
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{
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int i;
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for (i = 0; i < n; i++)
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put_u32((byte *) p + 4*i, x[i]);
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}
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#endif
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