diff options
Diffstat (limited to 'include/openflow/nicira-ext.h')
-rw-r--r-- | include/openflow/nicira-ext.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/openflow/nicira-ext.h b/include/openflow/nicira-ext.h index a6d2db45..aeb1a31c 100644 --- a/include/openflow/nicira-ext.h +++ b/include/openflow/nicira-ext.h @@ -1531,6 +1531,55 @@ OFP_ASSERT(sizeof(struct nx_action_output_reg) == 24); * Masking: Not maskable. */ #define NXM_NX_ND_TLL NXM_HEADER (0x0001, 25, 6) +/* IP fragment information. + * + * Prereqs: + * NXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd. + * + * Format: 8-bit value with one of the values 0, 1, or 3, as described below. + * + * Masking: Fully maskable. + * + * This field has three possible values: + * + * - A packet that is not an IP fragment has value 0. + * + * - A packet that is an IP fragment with offset 0 (the first fragment) has + * bit 0 set and thus value 1. + * + * - A packet that is an IP fragment with nonzero offset has bits 0 and 1 set + * and thus value 3. + * + * NX_IP_FRAG_ANY and NX_IP_FRAG_LATER are declared to symbolically represent + * the meanings of bits 0 and 1. + * + * The switch may reject matches against values that can never appear. + * + * It is important to understand how this field interacts with the OpenFlow IP + * fragment handling mode: + * + * - In OFPC_FRAG_DROP mode, the OpenFlow switch drops all IP fragments + * before they reach the flow table, so every packet that is available for + * matching will have value 0 in this field. + * + * - Open vSwitch does not implement OFPC_FRAG_REASM mode, but if it did then + * IP fragments would be reassembled before they reached the flow table and + * again every packet available for matching would always have value 0. + * + * - In OFPC_FRAG_NORMAL mode, all three values are possible, but OpenFlow + * 1.0 says that fragments' transport ports are always 0, even for the + * first fragment, so this does not provide much extra information. + * + * - In OFPC_FRAG_NX_MATCH mode, all three values are possible. For + * fragments with offset 0, Open vSwitch makes L4 header information + * available. + */ +#define NXM_NX_IP_FRAG NXM_HEADER (0x0001, 26, 1) +#define NXM_NX_IP_FRAG_W NXM_HEADER_W(0x0001, 26, 1) + +/* Bits in the value of NXM_NX_IP_FRAG. */ +#define NX_IP_FRAG_ANY (1 << 0) /* Is this a fragment? */ +#define NX_IP_FRAG_LATER (1 << 1) /* Is this a fragment with nonzero offset? */ /* ## --------------------- ## */ /* ## Requests and replies. ## */ |