diff options
Diffstat (limited to 'vnet/vnet/ip/ip4_forward.c')
| -rw-r--r-- | vnet/vnet/ip/ip4_forward.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/vnet/vnet/ip/ip4_forward.c b/vnet/vnet/ip/ip4_forward.c index 45699b128fe..35c42d822b7 100644 --- a/vnet/vnet/ip/ip4_forward.c +++ b/vnet/vnet/ip/ip4_forward.c @@ -2919,6 +2919,38 @@ ip4_rewrite_inline (vlib_main_t * vm, return frame->n_vectors; } + +/** \brief IPv4 transit rewrite node. + @node ip4-rewrite-transit + + This is the IPv4 transit-rewrite node: decrement TTL, fix the ipv4 + header checksum, fetch the ip adjacency, check the outbound mtu, + apply the adjacency rewrite, and send pkts to the adjacency + rewrite header's rewrite_next_index. + + @param vm vlib_main_t corresponding to the current thread + @param node vlib_node_runtime_t + @param frame vlib_frame_t whose contents should be dispatched + + @par Graph mechanics: buffer metadata, next index usage + + @em Uses: + - <code>vnet_buffer(b)->ip.adj_index[VLIB_TX]</code> + - the rewrite adjacency index + - <code>adj->lookup_next_index</code> + - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise + the packet will be dropped. + - <code>adj->rewrite_header</code> + - Rewrite string length, rewrite string, next_index + + @em Sets: + - <code>b->current_data, b->current_length</code> + - Updated net of applying the rewrite string + + <em>Next Indices:</em> + - <code> adj->rewrite_header.next_index </code> + or @c error-drop +*/ static uword ip4_rewrite_transit (vlib_main_t * vm, vlib_node_runtime_t * node, @@ -2928,6 +2960,39 @@ ip4_rewrite_transit (vlib_main_t * vm, /* rewrite_for_locally_received_packets */ 0); } +/** \brief IPv4 local rewrite node. + @node ip4-rewrite-local + + This is the IPv4 local rewrite node. Fetch the ip adjacency, check + the outbound interface mtu, apply the adjacency rewrite, and send + pkts to the adjacency rewrite header's rewrite_next_index. Deal + with hemorrhoids of the form "some clown sends an icmp4 w/ src = + dst = interface addr." + + @param vm vlib_main_t corresponding to the current thread + @param node vlib_node_runtime_t + @param frame vlib_frame_t whose contents should be dispatched + + @par Graph mechanics: buffer metadata, next index usage + + @em Uses: + - <code>vnet_buffer(b)->ip.adj_index[VLIB_RX]</code> + - the rewrite adjacency index + - <code>adj->lookup_next_index</code> + - Must be IP_LOOKUP_NEXT_REWRITE or IP_LOOKUP_NEXT_ARP, otherwise + the packet will be dropped. + - <code>adj->rewrite_header</code> + - Rewrite string length, rewrite string, next_index + + @em Sets: + - <code>b->current_data, b->current_length</code> + - Updated net of applying the rewrite string + + <em>Next Indices:</em> + - <code> adj->rewrite_header.next_index </code> + or @c error-drop +*/ + static uword ip4_rewrite_local (vlib_main_t * vm, vlib_node_runtime_t * node, |