diff options
Diffstat (limited to 'src/vnet/ip/ip4_packet.h')
| -rw-r--r-- | src/vnet/ip/ip4_packet.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/vnet/ip/ip4_packet.h b/src/vnet/ip/ip4_packet.h index c1852fc3ff2..79cf22c4d70 100644 --- a/src/vnet/ip/ip4_packet.h +++ b/src/vnet/ip/ip4_packet.h @@ -264,6 +264,70 @@ ip4_header_checksum (ip4_header_t * i) return csum; } +always_inline void +ip4_header_set_dscp (ip4_header_t * ip4, ip_dscp_t dscp) +{ + ip4->tos &= ~0xfc; + /* not masking the dscp value to save th instruction + * it shouldn't b necessary since the argument is an enum + * whose range is therefore constrained in the CP. in the + * DP it will have been taken from another packet, so again + * constrained in value */ + ip4->tos |= dscp << IP_PACKET_TC_FIELD_DSCP_BIT_SHIFT; +} + +always_inline void +ip4_header_set_ecn (ip4_header_t * ip4, ip_ecn_t ecn) +{ + ip4->tos &= ~IP_PACKET_TC_FIELD_ECN_MASK; + ip4->tos |= ecn; +} + +always_inline void +ip4_header_set_ecn_w_chksum (ip4_header_t * ip4, ip_ecn_t ecn) +{ + ip_csum_t sum = ip4->checksum; + u8 old = ip4->tos; + u8 new = (old & ~IP_PACKET_TC_FIELD_ECN_MASK) | ecn; + + sum = ip_csum_update (sum, old, new, ip4_header_t, tos); + ip4->checksum = ip_csum_fold (sum); + ip4->tos = new; +} + +always_inline ip_dscp_t +ip4_header_get_dscp (const ip4_header_t * ip4) +{ + return (ip4->tos >> IP_PACKET_TC_FIELD_DSCP_BIT_SHIFT); +} + +always_inline ip_ecn_t +ip4_header_get_ecn (const ip4_header_t * ip4) +{ + return (ip4->tos & IP_PACKET_TC_FIELD_ECN_MASK); +} + +always_inline void +ip4_header_set_df (ip4_header_t * ip4) +{ + ip4->flags_and_fragment_offset |= + clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT); +} + +always_inline void +ip4_header_clear_df (ip4_header_t * ip4) +{ + ip4->flags_and_fragment_offset &= + ~clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT); +} + +always_inline u8 +ip4_header_get_df (ip4_header_t * ip4) +{ + return (! !(ip4->flags_and_fragment_offset & + clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT))); +} + static inline uword ip4_header_checksum_is_valid (ip4_header_t * i) { |