2 * Palacios VNET Host Bridge
6 #include <linux/spinlock.h>
7 #include <linux/seq_file.h>
8 #include <linux/proc_fs.h>
9 #include <asm/uaccess.h>
10 #include <linux/inet.h>
11 #include <linux/kthread.h>
13 #include <linux/netdevice.h>
16 #include <linux/net.h>
17 #include <linux/string.h>
18 #include <linux/preempt.h>
19 #include <linux/sched.h>
22 #include <vnet/vnet.h>
23 #include <vnet/vnet_hashtable.h>
24 #include "palacios-vnet.h"
26 #define VNET_SERVER_PORT 9000
33 struct sockaddr_in sock_addr;
34 vnet_brg_proto_t sock_proto;
36 struct nic_statistics stats;
40 struct list_head node;
44 struct vnet_brg_state {
49 struct list_head link_list;
50 struct hashtable *ip2link;
54 struct socket * serv_sock;
55 struct sockaddr_in serv_addr;
56 vnet_brg_proto_t serv_proto;
58 struct task_struct * serv_thread;
60 void * brg_data; /* private data from vnet_core */
62 struct vnet_brg_stats stats;
66 static struct vnet_brg_state vnet_brg_s;
69 int vnet_brg_stats(struct vnet_brg_stats * stats){
70 memcpy(stats, &(vnet_brg_s.stats), sizeof(*stats));
75 static inline struct vnet_link * _link_by_ip(uint32_t ip) {
76 return (struct vnet_link *)vnet_htable_search(vnet_brg_s.ip2link, (addr_t)&ip);
79 static inline struct vnet_link * _link_by_idx(int idx) {
80 struct vnet_link * link = NULL;
82 list_for_each_entry(link, &(vnet_brg_s.link_list), node) {
84 if (link->idx == idx) {
92 static void _delete_link(struct vnet_link * link){
95 link->sock->ops->release(link->sock);
97 spin_lock_irqsave(&(vnet_brg_s.lock), flags);
98 list_del(&(link->node));
99 vnet_htable_remove(vnet_brg_s.ip2link, (addr_t)&(link->dst_ip), 0);
100 vnet_brg_s.num_links --;
101 spin_unlock_irqrestore(&(vnet_brg_s.lock), flags);
103 printk("VNET Bridge: Link deleted, ip 0x%x, port: %d, idx: %d\n",
112 void vnet_brg_delete_link(uint32_t idx){
113 struct vnet_link * link = _link_by_idx(idx);
120 static void deinit_links_list(void){
121 struct vnet_link * link;
123 list_for_each_entry(link, &(vnet_brg_s.link_list), node) {
128 static uint32_t _create_link(struct vnet_link * link) {
133 switch(link->sock_proto){
135 protocol = IPPROTO_UDP;
138 protocol = IPPROTO_TCP;
142 printk("Unsupported VNET Server Protocol\n");
146 if ((err = sock_create(AF_INET, SOCK_DGRAM, protocol, &link->sock)) < 0) {
147 printk("Could not create socket for VNET Link, error %d\n", err);
151 memset(&link->sock_addr, 0, sizeof(struct sockaddr));
153 link->sock_addr.sin_family = AF_INET;
154 link->sock_addr.sin_addr.s_addr = link->dst_ip;
155 link->sock_addr.sin_port = htons(link->dst_port);
157 if ((err = link->sock->ops->connect(link->sock, (struct sockaddr *)&(link->sock_addr), sizeof(struct sockaddr), 0) < 0)) {
158 printk("Could not connect to remote VNET Server, error %d\n", err);
162 spin_lock_irqsave(&(vnet_brg_s.lock), flags);
163 list_add(&(link->node), &(vnet_brg_s.link_list));
164 vnet_brg_s.num_links ++;
165 link->idx = ++ vnet_brg_s.link_idx;
166 vnet_htable_insert(vnet_brg_s.ip2link, (addr_t)&(link->dst_ip), (addr_t)link);
167 spin_unlock_irqrestore(&(vnet_brg_s.lock), flags);
169 printk("VNET Bridge: Link created, ip 0x%x, port: %d, idx: %d, link: %p, protocol: %s\n",
174 ((link->sock_proto==UDP)?"UDP":"TCP"));
180 uint32_t vnet_brg_add_link(uint32_t ip, uint16_t port, vnet_brg_proto_t proto){
181 struct vnet_link * new_link = NULL;
184 new_link = kmalloc(sizeof(struct vnet_link), GFP_KERNEL);
188 memset(new_link, 0, sizeof(struct vnet_link));
190 new_link->dst_ip = ip;
191 new_link->dst_port = port;
192 new_link->sock_proto = proto;
194 idx = _create_link(new_link);
196 printk("Could not create link\n");
205 int vnet_brg_link_stats(uint32_t link_idx, struct nic_statistics * stats){
206 struct vnet_link * link;
208 link = _link_by_idx(link_idx);
213 memcpy(stats, &(link->stats), sizeof(*stats));
220 _udp_send(struct socket * sock,
221 struct sockaddr_in * addr,
222 unsigned char * buf, int len) {
229 if (sock->sk == NULL) {
238 msg.msg_namelen = sizeof(struct sockaddr_in);
239 msg.msg_control = NULL;
240 msg.msg_controllen = 0;
243 msg.msg_control = NULL;
247 size = sock_sendmsg(sock, &msg, len);
256 _udp_recv(struct socket * sock,
257 struct sockaddr_in * addr,
258 unsigned char * buf, int len) {
264 if (sock->sk == NULL) {
273 msg.msg_namelen = sizeof(struct sockaddr_in);
274 msg.msg_control = NULL;
275 msg.msg_controllen = 0;
278 msg.msg_control = NULL;
282 size = sock_recvmsg(sock, &msg, len, msg.msg_flags);
289 /* send packets to VNET core */
291 send_to_palacios(unsigned char * buf,
294 struct v3_vnet_pkt pkt;
296 pkt.src_type = LINK_EDGE;
297 pkt.src_id = link_id;
298 memcpy(pkt.header, buf, ETHERNET_HEADER_LEN);
302 printk("VNET Lnx Bridge: send pkt to VNET core (size: %d, src_id: %d, src_type: %d)\n",
303 pkt.size, pkt.src_id, pkt.src_type);
305 print_hex_dump(NULL, "pkt_data: ", 0, 20, 20, pkt.data, pkt.size, 0);
309 vnet_brg_s.stats.pkt_to_vmm ++;
311 return v3_vnet_send_pkt(&pkt, NULL);
315 /* send packet to extern network */
317 bridge_send_pkt(struct v3_vm_info * vm,
318 struct v3_vnet_pkt * pkt,
319 void * private_data) {
320 struct vnet_link * link;
323 printk("VNET Lnx Host Bridge: packet received from VNET Core ... pkt size: %d, link: %d\n",
327 print_hex_dump(NULL, "pkt_data: ", 0, 20, 20, pkt->data, pkt->size, 0);
331 vnet_brg_s.stats.pkt_from_vmm ++;
333 link = _link_by_idx(pkt->dst_id);
335 switch(link->sock_proto){
337 _udp_send(link->sock, &(link->sock_addr), pkt->data, pkt->size);
338 vnet_brg_s.stats.pkt_to_phy ++;
341 vnet_brg_s.stats.pkt_to_phy ++;
345 printk("VNET Server: Invalid Link Protocol\n");
346 vnet_brg_s.stats.pkt_drop_vmm ++;
348 link->stats.tx_bytes += pkt->size;
349 link->stats.tx_pkts ++;
351 printk("VNET Bridge Linux Host: wrong dst link, idx: %d, discards the packet\n", pkt->dst_id);
352 vnet_brg_s.stats.pkt_drop_vmm ++;
359 static int init_vnet_serv(void) {
363 switch(vnet_brg_s.serv_proto){
365 protocol = IPPROTO_UDP;
368 protocol = IPPROTO_TCP;
372 printk("Unsupported VNET Server Protocol\n");
376 if ((err = sock_create(AF_INET, SOCK_DGRAM, protocol, &vnet_brg_s.serv_sock)) < 0) {
377 printk("Could not create VNET server socket, error: %d\n", err);
381 memset(&vnet_brg_s.serv_addr, 0, sizeof(struct sockaddr));
383 vnet_brg_s.serv_addr.sin_family = AF_INET;
384 vnet_brg_s.serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
385 vnet_brg_s.serv_addr.sin_port = htons(VNET_SERVER_PORT);
387 if ((err = vnet_brg_s.serv_sock->ops->bind(vnet_brg_s.serv_sock, (struct sockaddr *)&(vnet_brg_s.serv_addr), sizeof(struct sockaddr))) < 0) {
388 printk("Could not bind VNET server socket to port %d, error: %d\n", VNET_SERVER_PORT, err);
392 printk("VNET server bind to port: %d\n", VNET_SERVER_PORT);
394 if(vnet_brg_s.serv_proto == TCP){
395 if((err = vnet_brg_s.serv_sock->ops->listen(vnet_brg_s.serv_sock, 32)) < 0){
396 printk("VNET Server error listening on port %d, error %d\n", VNET_SERVER_PORT, err);
404 static int _udp_server(void * arg) {
406 struct sockaddr_in pkt_addr;
407 struct vnet_link * link = NULL;
410 printk("Palacios VNET Bridge: UDP receiving server ..... \n");
412 pkt = kmalloc(MAX_PACKET_LEN, GFP_KERNEL);
413 while (!kthread_should_stop()) {
415 len = _udp_recv(vnet_brg_s.serv_sock, &pkt_addr, pkt, MAX_PACKET_LEN);
417 printk("Receive error: Could not get packet, error %d\n", len);
421 link = _link_by_ip(pkt_addr.sin_addr.s_addr);
423 printk("VNET Server: No VNET Link match the src IP\n");
424 vnet_brg_s.stats.pkt_drop_phy ++;
428 vnet_brg_s.stats.pkt_from_phy ++;
429 link->stats.rx_bytes += len;
430 link->stats.rx_pkts ++;
432 send_to_palacios(pkt, len, link->idx);
441 static int _rx_server(void * arg) {
443 if(vnet_brg_s.serv_proto == UDP){
445 }else if(vnet_brg_s.serv_proto == TCP) {
446 //accept new connection
447 //use select to receive pkt from physical network
448 //or create new kthread to handle each connection?
450 printk ("VNET Server: Unsupported Protocol\n");
457 static inline unsigned int hash_fn(addr_t hdr_ptr) {
458 return vnet_hash_buffer((uint8_t *)hdr_ptr, sizeof(uint32_t));
461 static inline int hash_eq(addr_t key1, addr_t key2) {
462 return (memcmp((uint8_t *)key1, (uint8_t *)key2, sizeof(uint32_t)) == 0);
466 int vnet_bridge_init(void) {
467 struct v3_vnet_bridge_ops bridge_ops;
469 if(vnet_brg_s.status != 0) {
472 vnet_brg_s.status = 1;
474 memset(&vnet_brg_s, 0, sizeof(struct vnet_brg_state));
476 INIT_LIST_HEAD(&(vnet_brg_s.link_list));
477 spin_lock_init(&(vnet_brg_s.lock));
479 vnet_brg_s.serv_proto = UDP;
481 vnet_brg_s.ip2link = vnet_create_htable(10, hash_fn, hash_eq);
482 if(vnet_brg_s.ip2link == NULL){
483 printk("Failure to initiate VNET link hashtable\n");
487 if(init_vnet_serv() < 0){
488 printk("Failure to initiate VNET server\n");
492 vnet_brg_s.serv_thread = kthread_run(_rx_server, NULL, "vnet_brgd");
494 bridge_ops.input = bridge_send_pkt;
495 bridge_ops.poll = NULL;
497 if( v3_vnet_add_bridge(NULL, &bridge_ops, HOST_LNX_BRIDGE, NULL) < 0){
498 printk("VNET LNX Bridge: Fails to register bridge to VNET core");
501 printk("VNET Linux Bridge initiated\n");
507 void vnet_bridge_deinit(void){
509 v3_vnet_del_bridge(HOST_LNX_BRIDGE);
511 kthread_stop(vnet_brg_s.serv_thread);
512 vnet_brg_s.serv_sock->ops->release(vnet_brg_s.serv_sock);
516 vnet_free_htable(vnet_brg_s.ip2link, 0, 0);
518 vnet_brg_s.status = 0;