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-rw-r--r--src/vnet/vxlan-gbp/encap.c543
1 files changed, 543 insertions, 0 deletions
diff --git a/src/vnet/vxlan-gbp/encap.c b/src/vnet/vxlan-gbp/encap.c
new file mode 100644
index 00000000000..07142c8a521
--- /dev/null
+++ b/src/vnet/vxlan-gbp/encap.c
@@ -0,0 +1,543 @@
+/*
+ * Copyright (c) 2018 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 <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/vxlan-gbp/vxlan_gbp.h>
+#include <vnet/qos/qos_types.h>
+#include <vnet/adj/rewrite.h>
+
+/* Statistics (not all errors) */
+#define foreach_vxlan_gbp_encap_error \
+_(ENCAPSULATED, "good packets encapsulated")
+
+static char *vxlan_gbp_encap_error_strings[] = {
+#define _(sym,string) string,
+ foreach_vxlan_gbp_encap_error
+#undef _
+};
+
+typedef enum
+{
+#define _(sym,str) VXLAN_GBP_ENCAP_ERROR_##sym,
+ foreach_vxlan_gbp_encap_error
+#undef _
+ VXLAN_GBP_ENCAP_N_ERROR,
+} vxlan_gbp_encap_error_t;
+
+typedef enum
+{
+ VXLAN_GBP_ENCAP_NEXT_DROP,
+ VXLAN_GBP_ENCAP_N_NEXT,
+} vxlan_gbp_encap_next_t;
+
+typedef struct
+{
+ u32 tunnel_index;
+ u32 vni;
+ u16 sclass;
+} vxlan_gbp_encap_trace_t;
+
+u8 *
+format_vxlan_gbp_encap_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ vxlan_gbp_encap_trace_t *t = va_arg (*args, vxlan_gbp_encap_trace_t *);
+
+ s = format (s, "VXLAN_GBP encap to vxlan_gbp_tunnel%d vni %d sclass %d",
+ t->tunnel_index, t->vni, t->sclass);
+ return s;
+}
+
+always_inline uword
+vxlan_gbp_encap_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame, u8 is_ip4, u8 csum_offload)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+ vxlan_gbp_main_t *vxm = &vxlan_gbp_main;
+ vnet_main_t *vnm = vxm->vnet_main;
+ vnet_interface_main_t *im = &vnm->interface_main;
+ vlib_combined_counter_main_t *tx_counter =
+ im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX;
+ u32 pkts_encapsulated = 0;
+ u32 thread_index = vlib_get_thread_index ();
+ u32 sw_if_index0 = 0, sw_if_index1 = 0;
+ u32 next0 = 0, next1 = 0;
+ vxlan_gbp_tunnel_t *t0 = NULL, *t1 = NULL;
+ index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ next_index = node->cached_next_index;
+
+ STATIC_ASSERT_SIZEOF (ip6_vxlan_gbp_header_t, 56);
+ STATIC_ASSERT_SIZEOF (ip4_vxlan_gbp_header_t, 36);
+
+ u8 const underlay_hdr_len = is_ip4 ?
+ sizeof (ip4_vxlan_gbp_header_t) : sizeof (ip6_vxlan_gbp_header_t);
+ u8 const rw_hdr_offset = sizeof t0->rewrite_data - underlay_hdr_len;
+ u16 const l3_len = is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
+ u32 const csum_flags = is_ip4 ?
+ VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4 |
+ VNET_BUFFER_F_OFFLOAD_UDP_CKSUM : VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+
+ u32 bi0 = to_next[0] = from[0];
+ u32 bi1 = to_next[1] = from[1];
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
+ vlib_buffer_t *b1 = vlib_get_buffer (vm, bi1);
+ u32 flow_hash0 = vnet_l2_compute_flow_hash (b0);
+ u32 flow_hash1 = vnet_l2_compute_flow_hash (b1);
+
+ /* Get next node index and adj index from tunnel next_dpo */
+ if (sw_if_index0 != vnet_buffer (b0)->sw_if_index[VLIB_TX])
+ {
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+ vnet_hw_interface_t *hi0 =
+ vnet_get_sup_hw_interface (vnm, sw_if_index0);
+ t0 = &vxm->tunnels[hi0->dev_instance];
+ /* Note: change to always set next0 if it may set to drop */
+ next0 = t0->next_dpo.dpoi_next_node;
+ dpoi_idx0 = t0->next_dpo.dpoi_index;
+ }
+
+ /* Get next node index and adj index from tunnel next_dpo */
+ if (sw_if_index1 != vnet_buffer (b1)->sw_if_index[VLIB_TX])
+ {
+ if (sw_if_index0 == vnet_buffer (b1)->sw_if_index[VLIB_TX])
+ {
+ sw_if_index1 = sw_if_index0;
+ t1 = t0;
+ next1 = next0;
+ dpoi_idx1 = dpoi_idx0;
+ }
+ else
+ {
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];
+ vnet_hw_interface_t *hi1 =
+ vnet_get_sup_hw_interface (vnm, sw_if_index1);
+ t1 = &vxm->tunnels[hi1->dev_instance];
+ /* Note: change to always set next1 if it may set to drop */
+ next1 = t1->next_dpo.dpoi_next_node;
+ dpoi_idx1 = t1->next_dpo.dpoi_index;
+ }
+ }
+
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
+ vnet_buffer (b1)->ip.adj_index[VLIB_TX] = dpoi_idx1;
+
+ ASSERT (t0->rewrite_header.data_bytes == underlay_hdr_len);
+ ASSERT (t1->rewrite_header.data_bytes == underlay_hdr_len);
+
+ vlib_buffer_advance (b0, -underlay_hdr_len);
+ vlib_buffer_advance (b1, -underlay_hdr_len);
+
+ u32 len0 = vlib_buffer_length_in_chain (vm, b0);
+ u32 len1 = vlib_buffer_length_in_chain (vm, b1);
+ u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
+ u16 payload_l1 = clib_host_to_net_u16 (len1 - l3_len);
+
+ void *underlay0 = vlib_buffer_get_current (b0);
+ void *underlay1 = vlib_buffer_get_current (b1);
+
+ /* vnet_rewrite_two_header writes only in (uword) 8 bytes chunks
+ * and discards the first 4 bytes of the (36 bytes ip4 underlay) rewrite
+ * use memcpy as a workaround */
+ clib_memcpy (underlay0, t0->rewrite_header.data + rw_hdr_offset,
+ underlay_hdr_len);
+ clib_memcpy (underlay1, t1->rewrite_header.data + rw_hdr_offset,
+ underlay_hdr_len);
+
+ ip4_header_t *ip4_0, *ip4_1;
+ qos_bits_t ip4_0_tos = 0, ip4_1_tos = 0;
+ ip6_header_t *ip6_0, *ip6_1;
+ udp_header_t *udp0, *udp1;
+ vxlan_gbp_header_t *vxlan_gbp0, *vxlan_gbp1;
+ u8 *l3_0, *l3_1;
+ if (is_ip4)
+ {
+ ip4_vxlan_gbp_header_t *hdr0 = underlay0;
+ ip4_vxlan_gbp_header_t *hdr1 = underlay1;
+
+ /* Fix the IP4 checksum and length */
+ ip4_0 = &hdr0->ip4;
+ ip4_1 = &hdr1->ip4;
+ ip4_0->length = clib_host_to_net_u16 (len0);
+ ip4_1->length = clib_host_to_net_u16 (len1);
+
+ if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
+ {
+ ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
+ ip4_0->tos = ip4_0_tos;
+ }
+ if (PREDICT_FALSE (b1->flags & VNET_BUFFER_F_QOS_DATA_VALID))
+ {
+ ip4_1_tos = vnet_buffer2 (b1)->qos.bits;
+ ip4_1->tos = ip4_1_tos;
+ }
+
+ l3_0 = (u8 *) ip4_0;
+ l3_1 = (u8 *) ip4_1;
+ udp0 = &hdr0->udp;
+ udp1 = &hdr1->udp;
+ vxlan_gbp0 = &hdr0->vxlan_gbp;
+ vxlan_gbp1 = &hdr1->vxlan_gbp;
+ }
+ else /* ipv6 */
+ {
+ ip6_vxlan_gbp_header_t *hdr0 = underlay0;
+ ip6_vxlan_gbp_header_t *hdr1 = underlay1;
+
+ /* Fix IP6 payload length */
+ ip6_0 = &hdr0->ip6;
+ ip6_1 = &hdr1->ip6;
+ ip6_0->payload_length = payload_l0;
+ ip6_1->payload_length = payload_l1;
+
+ l3_0 = (u8 *) ip6_0;
+ l3_1 = (u8 *) ip6_1;
+ udp0 = &hdr0->udp;
+ udp1 = &hdr1->udp;
+ vxlan_gbp0 = &hdr0->vxlan_gbp;
+ vxlan_gbp1 = &hdr1->vxlan_gbp;
+ }
+
+ /* Fix UDP length and set source port */
+ udp0->length = payload_l0;
+ udp0->src_port = flow_hash0;
+ udp1->length = payload_l1;
+ udp1->src_port = flow_hash1;
+
+ /* set source class and gpflags */
+ vxlan_gbp0->gpflags = vnet_buffer2 (b0)->gbp.flags;
+ vxlan_gbp1->gpflags = vnet_buffer2 (b1)->gbp.flags;
+ vxlan_gbp0->sclass =
+ clib_host_to_net_u16 (vnet_buffer2 (b0)->gbp.src_epg);
+ vxlan_gbp1->sclass =
+ clib_host_to_net_u16 (vnet_buffer2 (b1)->gbp.src_epg);
+
+ if (csum_offload)
+ {
+ b0->flags |= csum_flags;
+ vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
+ b1->flags |= csum_flags;
+ vnet_buffer (b1)->l3_hdr_offset = l3_1 - b1->data;
+ vnet_buffer (b1)->l4_hdr_offset = (u8 *) udp1 - b1->data;
+ }
+ /* IPv4 UDP checksum only if checksum offload is used */
+ else if (is_ip4)
+ {
+ ip_csum_t sum0 = ip4_0->checksum;
+ sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
+ length /* changed member */ );
+ if (PREDICT_FALSE (ip4_0_tos))
+ {
+ sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
+ tos /* changed member */ );
+ }
+ ip4_0->checksum = ip_csum_fold (sum0);
+ ip_csum_t sum1 = ip4_1->checksum;
+ sum1 = ip_csum_update (sum1, 0, ip4_1->length, ip4_header_t,
+ length /* changed member */ );
+ if (PREDICT_FALSE (ip4_1_tos))
+ {
+ sum1 = ip_csum_update (sum1, 0, ip4_1_tos, ip4_header_t,
+ tos /* changed member */ );
+ }
+ ip4_1->checksum = ip_csum_fold (sum1);
+ }
+ /* IPv6 UDP checksum is mandatory */
+ else
+ {
+ int bogus = 0;
+
+ udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
+ (vm, b0, ip6_0, &bogus);
+ ASSERT (bogus == 0);
+ if (udp0->checksum == 0)
+ udp0->checksum = 0xffff;
+ udp1->checksum = ip6_tcp_udp_icmp_compute_checksum
+ (vm, b1, ip6_1, &bogus);
+ ASSERT (bogus == 0);
+ if (udp1->checksum == 0)
+ udp1->checksum = 0xffff;
+ }
+
+ vlib_increment_combined_counter (tx_counter, thread_index,
+ sw_if_index0, 1, len0);
+ vlib_increment_combined_counter (tx_counter, thread_index,
+ sw_if_index1, 1, len1);
+ pkts_encapsulated += 2;
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_gbp_encap_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->tunnel_index = t0 - vxm->tunnels;
+ tr->vni = t0->vni;
+ tr->sclass = vnet_buffer2 (b0)->gbp.src_epg;
+ }
+
+ if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_gbp_encap_trace_t *tr =
+ vlib_add_trace (vm, node, b1, sizeof (*tr));
+ tr->tunnel_index = t1 - vxm->tunnels;
+ tr->vni = t1->vni;
+ tr->sclass = vnet_buffer2 (b1)->gbp.src_epg;
+ }
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0 = to_next[0] = from[0];
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
+ u32 flow_hash0 = vnet_l2_compute_flow_hash (b0);
+
+ /* Get next node index and adj index from tunnel next_dpo */
+ if (sw_if_index0 != vnet_buffer (b0)->sw_if_index[VLIB_TX])
+ {
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+ vnet_hw_interface_t *hi0 =
+ vnet_get_sup_hw_interface (vnm, sw_if_index0);
+ t0 = &vxm->tunnels[hi0->dev_instance];
+ /* Note: change to always set next0 if it may be set to drop */
+ next0 = t0->next_dpo.dpoi_next_node;
+ dpoi_idx0 = t0->next_dpo.dpoi_index;
+ }
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpoi_idx0;
+
+ ASSERT (t0->rewrite_header.data_bytes == underlay_hdr_len);
+
+ vlib_buffer_advance (b0, -underlay_hdr_len);
+ void *underlay0 = vlib_buffer_get_current (b0);
+
+ /* vnet_rewrite_one_header writes only in (uword) 8 bytes chunks
+ * and discards the first 4 bytes of the (36 bytes ip4 underlay) rewrite
+ * use memcpy as a workaround */
+ clib_memcpy (underlay0, t0->rewrite_header.data + rw_hdr_offset,
+ underlay_hdr_len);
+
+ u32 len0 = vlib_buffer_length_in_chain (vm, b0);
+ u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len);
+
+ vxlan_gbp_header_t *vxlan_gbp0;
+ udp_header_t *udp0;
+ ip4_header_t *ip4_0;
+ qos_bits_t ip4_0_tos = 0;
+ ip6_header_t *ip6_0;
+ u8 *l3_0;
+ if (is_ip4)
+ {
+ ip4_vxlan_gbp_header_t *hdr = underlay0;
+
+ /* Fix the IP4 checksum and length */
+ ip4_0 = &hdr->ip4;
+ ip4_0->length = clib_host_to_net_u16 (len0);
+
+ if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
+ {
+ ip4_0_tos = vnet_buffer2 (b0)->qos.bits;
+ ip4_0->tos = ip4_0_tos;
+ }
+
+ l3_0 = (u8 *) ip4_0;
+ udp0 = &hdr->udp;
+ vxlan_gbp0 = &hdr->vxlan_gbp;
+ }
+ else /* ip6 path */
+ {
+ ip6_vxlan_gbp_header_t *hdr = underlay0;
+
+ /* Fix IP6 payload length */
+ ip6_0 = &hdr->ip6;
+ ip6_0->payload_length = payload_l0;
+
+ l3_0 = (u8 *) ip6_0;
+ udp0 = &hdr->udp;
+ vxlan_gbp0 = &hdr->vxlan_gbp;
+ }
+
+ /* Fix UDP length and set source port */
+ udp0->length = payload_l0;
+ udp0->src_port = flow_hash0;
+
+ /* set source class and gpflags */
+ vxlan_gbp0->gpflags = vnet_buffer2 (b0)->gbp.flags;
+ vxlan_gbp0->sclass =
+ clib_host_to_net_u16 (vnet_buffer2 (b0)->gbp.src_epg);
+
+ if (csum_offload)
+ {
+ b0->flags |= csum_flags;
+ vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data;
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data;
+ }
+ /* IPv4 UDP checksum only if checksum offload is used */
+ else if (is_ip4)
+ {
+ ip_csum_t sum0 = ip4_0->checksum;
+ sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t,
+ length /* changed member */ );
+ if (PREDICT_FALSE (ip4_0_tos))
+ {
+ sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t,
+ tos /* changed member */ );
+ }
+ ip4_0->checksum = ip_csum_fold (sum0);
+ }
+ /* IPv6 UDP checksum is mandatory */
+ else
+ {
+ int bogus = 0;
+
+ udp0->checksum = ip6_tcp_udp_icmp_compute_checksum
+ (vm, b0, ip6_0, &bogus);
+ ASSERT (bogus == 0);
+ if (udp0->checksum == 0)
+ udp0->checksum = 0xffff;
+ }
+
+ vlib_increment_combined_counter (tx_counter, thread_index,
+ sw_if_index0, 1, len0);
+ pkts_encapsulated++;
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ vxlan_gbp_encap_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->tunnel_index = t0 - vxm->tunnels;
+ tr->vni = t0->vni;
+ tr->sclass = vnet_buffer2 (b0)->gbp.src_epg;
+ }
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ /* Do we still need this now that tunnel tx stats is kept? */
+ vlib_node_increment_counter (vm, node->node_index,
+ VXLAN_GBP_ENCAP_ERROR_ENCAPSULATED,
+ pkts_encapsulated);
+
+ return from_frame->n_vectors;
+}
+
+static uword
+vxlan4_gbp_encap (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ /* Disable chksum offload as setup overhead in tx node is not worthwhile
+ for ip4 header checksum only, unless udp checksum is also required */
+ return vxlan_gbp_encap_inline (vm, node, from_frame, /* is_ip4 */ 1,
+ /* csum_offload */ 0);
+}
+
+static uword
+vxlan6_gbp_encap (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ /* Enable checksum offload for ip6 as udp checksum is mandatory, */
+ return vxlan_gbp_encap_inline (vm, node, from_frame, /* is_ip4 */ 0,
+ /* csum_offload */ 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (vxlan4_gbp_encap_node) =
+{
+ .function = vxlan4_gbp_encap,
+ .name = "vxlan4-gbp-encap",
+ .vector_size = sizeof (u32),
+ .format_trace = format_vxlan_gbp_encap_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (vxlan_gbp_encap_error_strings),
+ .error_strings = vxlan_gbp_encap_error_strings,
+ .n_next_nodes = VXLAN_GBP_ENCAP_N_NEXT,
+ .next_nodes = {
+ [VXLAN_GBP_ENCAP_NEXT_DROP] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_gbp_encap_node, vxlan4_gbp_encap)
+
+VLIB_REGISTER_NODE (vxlan6_gbp_encap_node) =
+{
+ .function = vxlan6_gbp_encap,
+ .name = "vxlan6-gbp-encap",
+ .vector_size = sizeof (u32),
+ .format_trace = format_vxlan_gbp_encap_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (vxlan_gbp_encap_error_strings),
+ .error_strings = vxlan_gbp_encap_error_strings,
+ .n_next_nodes = VXLAN_GBP_ENCAP_N_NEXT,
+ .next_nodes = {
+ [VXLAN_GBP_ENCAP_NEXT_DROP] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_gbp_encap_node, vxlan6_gbp_encap)
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */