From cb9cadad578297ffd78fa8a33670bdf1ab669e7e Mon Sep 17 00:00:00 2001 From: Ed Warnicke Date: Tue, 8 Dec 2015 15:45:58 -0700 Subject: Initial commit of vpp code. Change-Id: Ib246f1fbfce93274020ee93ce461e3d8bd8b9f17 Signed-off-by: Ed Warnicke --- vnet/vnet/nsh-gre/nsh_gre.c | 537 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 537 insertions(+) create mode 100644 vnet/vnet/nsh-gre/nsh_gre.c (limited to 'vnet/vnet/nsh-gre/nsh_gre.c') diff --git a/vnet/vnet/nsh-gre/nsh_gre.c b/vnet/vnet/nsh-gre/nsh_gre.c new file mode 100644 index 00000000000..f85e71a2d43 --- /dev/null +++ b/vnet/vnet/nsh-gre/nsh_gre.c @@ -0,0 +1,537 @@ +/* + * Copyright (c) 2015 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. + */ +#include +#include +#include +#include +#include +#include +#include + +nsh_gre_main_t nsh_gre_main; + +static u8 * format_decap_next (u8 * s, va_list * args) +{ + u32 next_index = va_arg (*args, u32); + + switch (next_index) + { + case NSH_INPUT_NEXT_DROP: + return format (s, "drop"); + case NSH_INPUT_NEXT_IP4_INPUT: + return format (s, "ip4"); + case NSH_INPUT_NEXT_IP6_INPUT: + return format (s, "ip6"); + default: + return format (s, "index %d", next_index); + } + return s; +} + + +u8 * format_nsh_gre_tunnel (u8 * s, va_list * args) +{ + nsh_gre_tunnel_t * t = va_arg (*args, nsh_gre_tunnel_t *); + nsh_gre_main_t * ngm = &nsh_gre_main; + + s = format (s, "[%d] %U (src) %U (dst) fibs: (encap %d, decap %d)", + t - ngm->tunnels, + format_ip4_address, &t->src, + format_ip4_address, &t->dst, + t->encap_fib_index, + t->decap_fib_index); + + s = format (s, " decap-next %U\n", format_decap_next, t->decap_next_index); + + s = format (s, " ver %d ", (t->ver_o_c>>6)); + if (t->ver_o_c & NSH_GRE_O_BIT) + s = format (s, "O-set "); + + if (t->ver_o_c & NSH_GRE_C_BIT) + s = format (s, "C-set "); + + s = format (s, "len %d (%d bytes) md_type %d next_protocol %d\n", + t->length, t->length * 4, t->md_type, t->next_protocol); + + s = format (s, " service path %d service index %d\n", + (t->spi_si>>NSH_GRE_SPI_SHIFT) & NSH_GRE_SPI_MASK, + t->spi_si & NSH_GRE_SINDEX_MASK); + + s = format (s, " c1 %d c2 %d c3 %d c4 %d\n", + t->c1, t->c2, t->c3, t->c4); + + return s; +} + +static u8 * format_nsh_gre_name (u8 * s, va_list * args) +{ + nsh_gre_main_t * ngm = &nsh_gre_main; + u32 i = va_arg (*args, u32); + u32 show_dev_instance = ~0; + + if (i < vec_len (ngm->dev_inst_by_real)) + show_dev_instance = ngm->dev_inst_by_real[i]; + + if (show_dev_instance != ~0) + i = show_dev_instance; + + return format (s, "nsh_gre_tunnel%d", i); +} + +static int nsh_gre_name_renumber (vnet_hw_interface_t * hi, + u32 new_dev_instance) +{ + nsh_gre_main_t * ngm = &nsh_gre_main; + + vec_validate_init_empty (ngm->dev_inst_by_real, hi->dev_instance, ~0); + + ngm->dev_inst_by_real [hi->dev_instance] = new_dev_instance; + + return 0; +} + +static uword dummy_interface_tx (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + clib_warning ("you shouldn't be here, leaking buffers..."); + return frame->n_vectors; +} + +VNET_DEVICE_CLASS (nsh_gre_device_class,static) = { + .name = "NSH_GRE", + .format_device_name = format_nsh_gre_name, + .format_tx_trace = format_nsh_gre_encap_trace, + .tx_function = dummy_interface_tx, + .name_renumber = nsh_gre_name_renumber, +}; + +static uword dummy_set_rewrite (vnet_main_t * vnm, + u32 sw_if_index, + u32 l3_type, + void * dst_address, + void * rewrite, + uword max_rewrite_bytes) +{ + return 0; +} + +static u8 * format_nsh_gre_header_with_length (u8 * s, va_list * args) +{ + u32 dev_instance = va_arg (*args, u32); + s = format (s, "unimplemented dev %u", dev_instance); + return s; +} + +VNET_HW_INTERFACE_CLASS (nsh_gre_hw_class) = { + .name = "NSH_GRE", + .format_header = format_nsh_gre_header_with_length, + .set_rewrite = dummy_set_rewrite, +}; + +#define foreach_copy_field \ +_(src.as_u32) \ +_(dst.as_u32) \ +_(encap_fib_index) \ +_(decap_fib_index) \ +_(decap_next_index) \ +_(ver_o_c) \ +_(length) \ +_(md_type) \ +_(next_protocol) \ +_(spi_si) \ +_(c1) \ +_(c2) \ +_(c3) \ +_(c4) \ +_(tlvs) + +#define foreach_32bit_field \ +_(spi_si) \ +_(c1) \ +_(c2) \ +_(c3) \ +_(c4) + +static int nsh_gre_rewrite (nsh_gre_tunnel_t * t) +{ + u8 *rw = 0; + ip4_header_t * ip0; + nsh_header_t * nsh0; + ip4_gre_and_nsh_header_t * h0; + int len; + + len = sizeof (*h0) + vec_len(t->tlvs)*4; + + vec_validate_aligned (rw, len-1, CLIB_CACHE_LINE_BYTES); + + h0 = (ip4_gre_and_nsh_header_t *) rw; + + /* Fixed portion of the (outer) ip4 header */ + ip0 = &h0->ip4; + ip0->ip_version_and_header_length = 0x45; + ip0->ttl = 254; + ip0->protocol = IP_PROTOCOL_GRE; + /* we fix up the ip4 header length and checksum after-the-fact */ + ip0->src_address.as_u32 = t->src.as_u32; + ip0->dst_address.as_u32 = t->dst.as_u32; + ip0->checksum = ip4_header_checksum (ip0); + + /* GRE header, zero execpt for the NSH ethertype */ + h0->gre.protocol = clib_host_to_net_u16(GRE_PROTOCOL_nsh); + + /* NSH header */ + nsh0 = &h0->nsh; + nsh0->ver_o_c = t->ver_o_c; + nsh0->md_type = t->md_type; + nsh0->next_protocol = t->next_protocol; + nsh0->spi_si = t->spi_si; + nsh0->c1 = t->c1; + nsh0->c2 = t->c2; + nsh0->c3 = t->c3; + nsh0->c4 = t->c4; + + /* Endian swap 32-bit fields */ +#define _(x) nsh0->x = clib_host_to_net_u32(nsh0->x); + foreach_32bit_field; +#undef _ + + /* fix nsh header length */ + t->length = 6 + vec_len(t->tlvs); + nsh0->length = t->length; + + /* Copy any TLVs */ + if (vec_len(t->tlvs)) + memcpy (nsh0->tlvs, t->tlvs, 4*vec_len(t->tlvs)); + + t->rewrite = rw; + return (0); +} + +int vnet_nsh_gre_add_del_tunnel (vnet_nsh_gre_add_del_tunnel_args_t *a, + u32 * sw_if_indexp) +{ + nsh_gre_main_t * ngm = &nsh_gre_main; + nsh_gre_tunnel_t *t = 0; + vnet_main_t * vnm = ngm->vnet_main; + vnet_hw_interface_t * hi; + uword * p; + u32 hw_if_index = ~0; + u32 sw_if_index = ~0; + int rv; + u64 key; + u32 spi_si_net_byte_order; + + spi_si_net_byte_order = clib_host_to_net_u32(a->spi_si); + + key = (((u64)(a->src.as_u32))<<32) | spi_si_net_byte_order; + + p = hash_get (ngm->nsh_gre_tunnel_by_src_address, key); + + if (a->is_add) + { + /* adding a tunnel: tunnel must not already exist */ + if (p) + return VNET_API_ERROR_INVALID_VALUE; + + if (a->decap_next_index >= NSH_INPUT_N_NEXT) + return VNET_API_ERROR_INVALID_DECAP_NEXT; + + pool_get_aligned (ngm->tunnels, t, CLIB_CACHE_LINE_BYTES); + memset (t, 0, sizeof (*t)); + + /* copy from arg structure */ +#define _(x) t->x = a->x; + foreach_copy_field; +#undef _ + + rv = nsh_gre_rewrite (t); + + if (rv) + { + pool_put (ngm->tunnels, t); + return rv; + } + + hash_set (ngm->nsh_gre_tunnel_by_src_address, key, t - ngm->tunnels); + + if (vec_len (ngm->free_nsh_gre_tunnel_hw_if_indices) > 0) + { + hw_if_index = ngm->free_nsh_gre_tunnel_hw_if_indices + [vec_len (ngm->free_nsh_gre_tunnel_hw_if_indices)-1]; + _vec_len (ngm->free_nsh_gre_tunnel_hw_if_indices) -= 1; + + hi = vnet_get_hw_interface (vnm, hw_if_index); + hi->dev_instance = t - ngm->tunnels; + hi->hw_instance = hi->dev_instance; + } + else + { + hw_if_index = vnet_register_interface + (vnm, nsh_gre_device_class.index, t - ngm->tunnels, + nsh_gre_hw_class.index, t - ngm->tunnels); + hi = vnet_get_hw_interface (vnm, hw_if_index); + hi->output_node_index = nsh_gre_encap_node.index; + } + + t->hw_if_index = hw_if_index; + t->sw_if_index = sw_if_index = hi->sw_if_index; + + vnet_sw_interface_set_flags (vnm, hi->sw_if_index, + VNET_SW_INTERFACE_FLAG_ADMIN_UP); + } + else + { + /* deleting a tunnel: tunnel must exist */ + if (!p) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + t = pool_elt_at_index (ngm->tunnels, p[0]); + + vnet_sw_interface_set_flags (vnm, t->sw_if_index, 0 /* down */); + vec_add1 (ngm->free_nsh_gre_tunnel_hw_if_indices, t->hw_if_index); + + hash_unset (ngm->nsh_gre_tunnel_by_src_address, key); + vec_free (t->rewrite); + pool_put (ngm->tunnels, t); + } + + if (sw_if_indexp) + *sw_if_indexp = sw_if_index; + + return 0; +} + +static u32 fib_index_from_fib_id (u32 fib_id) +{ + ip4_main_t * im = &ip4_main; + uword * p; + + p = hash_get (im->fib_index_by_table_id, fib_id); + if (!p) + return ~0; + + return p[0]; +} + +static uword unformat_decap_next (unformat_input_t * input, va_list * args) +{ + u32 * result = va_arg (*args, u32 *); + u32 tmp; + + if (unformat (input, "drop")) + *result = NSH_INPUT_NEXT_DROP; + else if (unformat (input, "ip4")) + *result = NSH_INPUT_NEXT_IP4_INPUT; + else if (unformat (input, "ip6")) + *result = NSH_INPUT_NEXT_IP6_INPUT; + else if (unformat (input, "ethernet")) + *result = NSH_INPUT_NEXT_IP6_INPUT; + else if (unformat (input, "%d", &tmp)) + *result = tmp; + else + return 0; + return 1; +} + +static clib_error_t * +nsh_gre_add_del_tunnel_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, * line_input = &_line_input; + ip4_address_t src, dst; + u8 is_add = 1; + u8 src_set = 0; + u8 dst_set = 0; + u32 encap_fib_index = 0; + u32 decap_fib_index = 0; + u8 ver_o_c = 0; + u8 length = 0; + u8 md_type = 0; + u8 next_protocol = 1; /* ip4 */ + u32 spi; + u8 spi_set = 0; + u32 si; + u8 si_set = 0; + u32 spi_si; + u32 c1 = 0; + u32 c2 = 0; + u32 c3 = 0; + u32 c4 = 0; + u32 decap_next_index = 1; /* ip4_input */ + u32 *tlvs = 0; + u32 tmp; + int rv; + vnet_nsh_gre_add_del_tunnel_args_t _a, * a = &_a; + + /* Get a line of input. */ + if (! unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) { + if (unformat (line_input, "del")) + is_add = 0; + else if (unformat (line_input, "src %U", + unformat_ip4_address, &src)) + src_set = 1; + else if (unformat (line_input, "dst %U", + unformat_ip4_address, &dst)) + dst_set = 1; + else if (unformat (line_input, "encap-vrf-id %d", &tmp)) + { + encap_fib_index = fib_index_from_fib_id (tmp); + if (encap_fib_index == ~0) + return clib_error_return (0, "nonexistent encap fib id %d", tmp); + } + else if (unformat (line_input, "decap-vrf-id %d", &tmp)) + { + decap_fib_index = fib_index_from_fib_id (tmp); + if (decap_fib_index == ~0) + return clib_error_return (0, "nonexistent decap fib id %d", tmp); + } + else if (unformat (line_input, "decap-next %U", unformat_decap_next, + &decap_next_index)) + ; + else if (unformat (line_input, "version %d", &tmp)) + ver_o_c |= (tmp & 3) << 6; + else if (unformat (line_input, "o-bit %d", &tmp)) + ver_o_c |= (tmp & 1) << 5; + else if (unformat (line_input, "c-bit %d", &tmp)) + ver_o_c |= (tmp & 1) << 4; + else if (unformat (line_input, "md-type %d", &tmp)) + md_type = tmp; + else if (unformat(line_input, "next-ip4")) + next_protocol = 1; + else if (unformat(line_input, "next-ip6")) + next_protocol = 2; + else if (unformat(line_input, "next-ethernet")) + next_protocol = 3; + else if (unformat (line_input, "c1 %d", &c1)) + ; + else if (unformat (line_input, "c2 %d", &c2)) + ; + else if (unformat (line_input, "c3 %d", &c3)) + ; + else if (unformat (line_input, "c4 %d", &c4)) + ; + else if (unformat (line_input, "spi %d", &spi)) + spi_set = 1; + else if (unformat (line_input, "si %d", &si)) + si_set = 1; + else if (unformat (line_input, "tlv %x")) + vec_add1 (tlvs, tmp); + else + return clib_error_return (0, "parse error: '%U'", + format_unformat_error, line_input); + } + + unformat_free (line_input); + + if (src_set == 0) + return clib_error_return (0, "tunnel src address not specified"); + + if (dst_set == 0) + return clib_error_return (0, "tunnel dst address not specified"); + + if (spi_set == 0) + return clib_error_return (0, "spi not specified"); + + if (si_set == 0) + return clib_error_return (0, "si not specified"); + + spi_si = (spi<<8) | si; + + memset (a, 0, sizeof (*a)); + + a->is_add = is_add; + +#define _(x) a->x = x; + foreach_copy_field; +#undef _ + + rv = vnet_nsh_gre_add_del_tunnel (a, 0 /* hw_if_indexp */); + + switch(rv) + { + case 0: + break; + case VNET_API_ERROR_INVALID_DECAP_NEXT: + return clib_error_return (0, "invalid decap-next..."); + + case VNET_API_ERROR_TUNNEL_EXIST: + return clib_error_return (0, "tunnel already exists..."); + + case VNET_API_ERROR_NO_SUCH_ENTRY: + return clib_error_return (0, "session does not exist..."); + + default: + return clib_error_return + (0, "vnet_nsh_gre_add_del_tunnel returned %d", rv); + } + + return 0; +} + +VLIB_CLI_COMMAND (create_nsh_gre_tunnel_command, static) = { + .path = "nsh gre tunnel", + .short_help = + "nsh gre tunnel src dst " + " c1 c2 c3 c4 spi si \n" + " [encap-fib-id ] [decap-fib-id ] [o-bit <1|0>] [c-bit <1|0>]\n" + " [md-type ][next-ip4][next-ip6][next-ethernet]\n" + " [tlv ]\n", + .function = nsh_gre_add_del_tunnel_command_fn, +}; + +static clib_error_t * +show_nsh_gre_tunnel_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + nsh_gre_main_t * ngm = &nsh_gre_main; + nsh_gre_tunnel_t * t; + + if (pool_elts (ngm->tunnels) == 0) + vlib_cli_output (vm, "No nsh-gre tunnels configured..."); + + pool_foreach (t, ngm->tunnels, + ({ + vlib_cli_output (vm, "%U", format_nsh_gre_tunnel, t); + })); + + return 0; +} + +VLIB_CLI_COMMAND (show_nsh_gre_tunnel_command, static) = { + .path = "show nsh gre tunnel", + .function = show_nsh_gre_tunnel_command_fn, +}; + +clib_error_t *nsh_gre_init (vlib_main_t *vm) +{ + nsh_gre_main_t *ngm = &nsh_gre_main; + + ngm->vnet_main = vnet_get_main(); + ngm->vlib_main = vm; + + ngm->nsh_gre_tunnel_by_src_address = hash_create (0, sizeof (uword)); + gre_register_input_protocol (vm, GRE_PROTOCOL_nsh, + nsh_gre_input_node.index); + return 0; +} + +VLIB_INIT_FUNCTION(nsh_gre_init); + -- cgit 1.2.3-korg