| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* include/net/dsfield.h - Manipulation of the Differentiated Services field */ |
| |
| /* Written 1998-2000 by Werner Almesberger, EPFL ICA */ |
| |
| |
| #ifndef __NET_DSFIELD_H |
| #define __NET_DSFIELD_H |
| |
| #include <linux/types.h> |
| #include <linux/ip.h> |
| #include <linux/ipv6.h> |
| #include <asm/byteorder.h> |
| |
| |
| static inline __u8 ipv4_get_dsfield(const struct iphdr *iph) |
| { |
| return iph->tos; |
| } |
| |
| |
| static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h) |
| { |
| return ntohs(*(const __be16 *)ipv6h) >> 4; |
| } |
| |
| |
| static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask, |
| __u8 value) |
| { |
| __u32 check = ntohs((__force __be16)iph->check); |
| __u8 dsfield; |
| |
| dsfield = (iph->tos & mask) | value; |
| check += iph->tos; |
| if ((check+1) >> 16) check = (check+1) & 0xffff; |
| check -= dsfield; |
| check += check >> 16; /* adjust carry */ |
| iph->check = (__force __sum16)htons(check); |
| iph->tos = dsfield; |
| } |
| |
| |
| static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask, |
| __u8 value) |
| { |
| __be16 *p = (__force __be16 *)ipv6h; |
| |
| *p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4); |
| } |
| |
| |
| #endif |