diff options
Diffstat (limited to 'src/vnet/rewrite.h')
| -rw-r--r-- | src/vnet/rewrite.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/vnet/rewrite.h b/src/vnet/rewrite.h index 00c1efbdc5e..ce2bce3a3c8 100644 --- a/src/vnet/rewrite.h +++ b/src/vnet/rewrite.h @@ -64,6 +64,16 @@ typedef CLIB_PACKED (struct { Used for MTU check after packet rewrite. */ u16 max_l3_packet_bytes; + /* When dynamically writing a multicast destination L2 addresss + * this is the offset within the address to start writing n + * bytes of the IP mcast address */ + u8 dst_mcast_offset; + + /* When dynamically writing a multicast destination L2 addresss + * this is the number of bytes of the dest IP address to write into + * the MAC rewrite */ + u8 dst_mcast_n_bytes; + /* Rewrite string starting at end and going backwards. */ u8 data[0]; }) vnet_rewrite_header_t; @@ -261,6 +271,27 @@ _vnet_rewrite_two_headers (vnet_rewrite_header_t * h0, sizeof ((rw0).rewrite_data), \ (most_likely_size)) +always_inline void +_vnet_fixup_one_header (vnet_rewrite_header_t * h0, + u8 * addr, u32 addr_len, + u8 * packet0, int clear_first_bit) +{ + /* location to write to in the packet */ + u8 *p0 = packet0 - h0->dst_mcast_offset; + u8 *p1 = p0; + /* location to write from in the L3 dest address */ + u8 *a0 = addr + addr_len - h0->dst_mcast_n_bytes; + + clib_memcpy (p0, a0, h0->dst_mcast_n_bytes); + if (clear_first_bit) + *p1 &= 0x7f; +} + +#define vnet_fixup_one_header(rw0,addr,p0,clear_first_bit) \ + _vnet_fixup_one_header (&((rw0).rewrite_header), \ + (u8*)(addr), sizeof((*addr)), \ + (u8*)(p0), (clear_first_bit)) + #define VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST ((void *) 0) /** Deprecated */ void vnet_rewrite_for_sw_interface (struct vnet_main_t *vnm, |