/* * Copyright (c) 2017 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef __included_udp_h__ #define __included_udp_h__ #include #include #include #include #include #include #include #include #include typedef enum { #define udp_error(n,s) UDP_ERROR_##n, #include #undef udp_error UDP_N_ERROR, } udp_error_t; typedef struct { /** Required for pool_get_aligned */ CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); transport_connection_t connection; /**< must be first */ clib_spinlock_t rx_lock; /**< rx fifo lock */ u8 is_connected; /**< connected mode */ } udp_connection_t; #define foreach_udp4_dst_port \ _ (53, dns) \ _ (67, dhcp_to_server) \ _ (68, dhcp_to_client) \ _ (500, ikev2) \ _ (2152, GTPU) \ _ (3784, bfd4) \ _ (3785, bfd_echo4) \ _ (4341, lisp_gpe) \ _ (4342, lisp_cp) \ _ (4500, ipsec) \ _ (4739, ipfix) \ _ (4789, vxlan) \ _ (4789, vxlan6) \ _ (48879, vxlan_gbp) \ _ (4790, VXLAN_GPE) \ _ (6633, vpath_3) \ _ (6081, geneve) \ _ (53053, dns_reply) #define foreach_udp6_dst_port \ _ (53, dns6) \ _ (547, dhcpv6_to_server) \ _ (546, dhcpv6_to_client) \ _ (2152, GTPU6) \ _ (3784, bfd6) \ _ (3785, bfd_echo6) \ _ (4341, lisp_gpe6) \ _ (4342, lisp_cp6) \ _ (48879, vxlan6_gbp) \ _ (4790, VXLAN6_GPE) \ _ (6633, vpath6_3) \ _ (6081, geneve6) \ _ (8138, BIER) \ _ (53053, dns_reply6) typedef enum { #define _(n,f) UDP_DST_PORT_##f = n, foreach_udp4_dst_port foreach_udp6_dst_port #undef _ } udp_dst_port_t; typedef enum { #define _(n,f) UDP6_DST_PORT_##f = n, foreach_udp6_dst_port #undef _ } udp6_dst_port_t; typedef struct { /* Name (a c string). */ char *name; /* GRE protocol type in host byte order. */ udp_dst_port_t dst_port; /* Node which handles this type. */ u32 node_index; /* Next index for this type. */ u32 next_index; /* Parser for packet generator edits for this protocol */ unformat_function_t *unformat_pg_edit; } udp_dst_port_info_t; typedef enum { UDP_IP6 = 0, UDP_IP4, /* the code is full of is_ip4... */ N_UDP_AF, } udp_af_t; typedef struct { udp_dst_port_info_t *dst_port_infos[N_UDP_AF]; /* Hash tables mapping name/protocol to protocol info index. */ uword *dst_port_info_by_name[N_UDP_AF]; uword *dst_port_info_by_dst_port[N_UDP_AF]; /* Sparse vector mapping udp dst_port in network byte order to next index. */ u16 *next_by_dst_port4; u16 *next_by_dst_port6; u8 punt_unknown4; u8 punt_unknown6; /* * Per-worker thread udp connection pools used with session layer */ udp_connection_t **connections; u32 *connection_peekers; clib_spinlock_t *peekers_readers_locks; clib_spinlock_t *peekers_write_locks; udp_connection_t *listener_pool; } udp_main_t; extern udp_main_t udp_main; extern vlib_node_registration_t udp4_input_node; extern vlib_node_registration_t udp6_input_node; always_inline udp_connection_t * udp_connection_get (u32 conn_index, u32 thread_index) { if (pool_is_free_index (udp_main.connections[thread_index], conn_index)) return 0; return pool_elt_at_index (udp_main.connections[thread_index], conn_index); } always_inline udp_connection_t * udp_listener_get (u32 conn_index) { return pool_elt_at_index (udp_main.listener_pool, conn_index); } always_inline udp_main_t * vnet_get_udp_main () { return &udp_main; } always_inline udp_connection_t * udp_get_connection_from_transport (transport_connection_t * tc) { return ((udp_connection_t *) tc); } always_inline u32 udp_connection_index (udp_connection_t * uc) { return (uc - udp_main.connections[uc->c_thread_index]); } udp_connection_t *udp_connection_alloc (u32 thread_index); /** * Acquires a lock that blocks a connection pool from expanding. */ always_inline void udp_pool_add_peeker (u32 thread_index) { if (thread_index != vlib_get_thread_index ()) return; clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]); udp_main.connection_peekers[thread_index] += 1; if (udp_main.connection_peekers[thread_index] == 1) clib_spinlock_lock_if_init (&udp_main.peekers_write_locks[thread_index]); clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks [thread_index]); } always_inline void udp_pool_remove_peeker (u32 thread_index) { if (thread_index != vlib_get_thread_index ()) return; ASSERT (udp_main.connection_peekers[thread_index] > 0); clib_spinlock_lock_if_init (&udp_main.peekers_readers_locks[thread_index]); udp_main.connection_peekers[thread_index] -= 1; if (udp_main.connection_peekers[thread_index] == 0) clib_spinlock_unlock_if_init (&udp_main.peekers_write_locks [thread_index]); clib_spinlock_unlock_if_init (&udp_main.peekers_readers_locks [thread_index]); } always_inline udp_connection_t * udp_connection_clone_safe (u32 connection_index, u32 thread_index) { udp_connection_t *old_c, *new_c; u32 current_thread_index = vlib_get_thread_index (); new_c = udp_connection_alloc (current_thread_index); /* If during the memcpy pool is reallocated AND the memory allocator * decides to give the old chunk of memory to somebody in a hurry to * scribble something on it, we have a problem. So add this thread as * a session pool peeker. */ udp_pool_add_peeker (thread_index); old_c = udp_main.connections[thread_index] + connection_index; clib_memcpy (new_c, old_c, sizeof (*new_c)); udp_pool_remove_peeker (thread_index); new_c->c_thread_index = current_thread_index; new_c->c_c_index = udp_connection_index (new_c); return new_c; } always_inline udp_dst_port_info_t * udp_get_dst_port_info (udp_main_t * um, udp_dst_port_t dst_port, u8 is_ip4) { uword *p = hash_get (um->dst_port_info_by_dst_port[is_ip4], dst_port); return p ? vec_elt_at_index (um->dst_port_infos[is_ip4], p[0]) : 0; } format_function_t format_udp_header; format_function_t format_udp_rx_trace; unformat_function_t unformat_udp_header; void udp_register_dst_port (vlib_main_t * vm, udp_dst_port_t dst_port, u32 node_index, u8 is_ip4); void udp_unregister_dst_port (vlib_main_t * vm, udp_dst_port_t dst_port, u8 is_ip4); void udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add); always_inline void * vlib_buffer_push_udp (vlib_buffer_t * b, u16 sp, u16 dp, u8 offload_csum) { udp_header_t *uh; u16 udp_len = sizeof (udp_header_t) + b->current_length; if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)) udp_len += b->total_length_not_including_first_buffer; uh = vlib_buffer_push_uninit (b, sizeof (udp_header_t)); uh->src_port = sp; uh->dst_port = dp; uh->checksum = 0; uh->length = clib_host_to_net_u16 (udp_len); if (offload_csum) { b->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM; vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data; } return uh; } always_inline void ip_udp_fixup_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 is_ip4) { u16 new_l0; udp_header_t *udp0; if (is_ip4) { ip4_header_t *ip0; ip_csum_t sum0; u16 old_l0 = 0; ip0 = vlib_buffer_get_current (b0); /* fix the ing outer-IP checksum */ sum0 = ip0->checksum; /* old_l0 always 0, see the rewrite setup */ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t, length /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); ip0->length = new_l0; /* Fix UDP length */ udp0 = (udp_header_t *) (ip0 + 1); new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) - sizeof (*ip0)); udp0->length = new_l0; } else { ip6_header_t *ip0; int bogus0; ip0 = vlib_buffer_get_current (b0); new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) - sizeof (*ip0)); ip0->payload_length = new_l0; /* Fix UDP length */ udp0 = (udp_header_t *) (ip0 + 1); udp0->length = new_l0; udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0); ASSERT (bogus0 == 0); if (udp0->checksum == 0) udp0->checksum = 0xffff; } } always_inline void ip_udp_encap_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 * ec0, word ec_len, u8 is_ip4) { vlib_buffer_advance (b0, -ec_len); if (is_ip4) { ip4_header_t *ip0; ip0 = vlib_buffer_get_current (b0); /* Apply the encap string. */ clib_memcpy (ip0, ec0, ec_len); ip_udp_fixup_one (vm, b0, 1); } else { ip6_header_t *ip0; ip0 = vlib_buffer_get_current (b0); /* Apply the encap string. */ clib_memcpy (ip0, ec0, ec_len); ip_udp_fixup_one (vm, b0, 0); } } always_inline void ip_udp_encap_two (vlib_main_t * vm, vlib_buffer_t * b0, vlib_buffer_t * b1, u8 * ec0, u8 * ec1, word ec_len, u8 is_v4) { u16 new_l0, new_l1; udp_header_t *udp0, *udp1; ASSERT (_vec_len (ec0) == _vec_len (ec1)); vlib_buffer_advance (b0, -ec_len); vlib_buffer_advance (b1, -ec_len); if (is_v4) { ip4_header_t *ip0, *ip1; ip_csum_t sum0, sum1; u16 old_l0 = 0, old_l1 = 0; ip0 = vlib_buffer_get_current (b0); ip1 = vlib_buffer_get_current (b1); /* Apply the encap string */ clib_memcpy (ip0, ec0, ec_len); clib_memcpy (ip1, ec1, ec_len); /* fix the ing outer-IP checksum */ sum0 = ip0->checksum; sum1 = ip1->checksum; /* old_l0 always 0, see the rewrite setup */ new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)); sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t, length /* changed member */ ); sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t, length /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); ip1->checksum = ip_csum_fold (sum1); ip0->length = new_l0; ip1->length = new_l1; /* Fix UDP length */ udp0 = (udp_header_t *) (ip0 + 1); udp1 = (udp_header_t *) (ip1 + 1); new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) - sizeof (*ip0)); new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1) - sizeof (*ip1)); udp0->length = new_l0; udp1->length = new_l1; } else { ip6_header_t *ip0, *ip1; int bogus0, bogus1; ip0 = vlib_buffer_get_current (b0); ip1 = vlib_buffer_get_current (b1); /* Apply the encap string. */ clib_memcpy (ip0, ec0, ec_len); clib_memcpy (ip1, ec1, ec_len); new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) - sizeof (*ip0)); new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1) - sizeof (*ip1)); ip0->payload_length = new_l0; ip1->payload_length = new_l1; /* Fix UDP length */ udp0 = (udp_header_t *) (ip0 + 1); udp1 = (udp_header_t *) (ip1 + 1); udp0->length = new_l0; udp1->length = new_l1; udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0); udp1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip1, &bogus1); ASSERT (bogus0 == 0); ASSERT (bogus1 == 0); if (udp0->checksum == 0) udp0->checksum = 0xffff; if (udp1->checksum == 0) udp1->checksum = 0xffff; } } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */ #endif /* __included_udp_h__ */