2 Palacios VNET Host Bridge
5 #include <linux/spinlock.h>
6 #include <linux/seq_file.h>
7 #include <linux/proc_fs.h>
8 #include <asm/uaccess.h>
9 #include <linux/inet.h>
10 #include <linux/kthread.h>
12 #include <linux/netdevice.h>
15 #include <linux/net.h>
16 #include <linux/string.h>
17 #include <linux/preempt.h>
18 #include <linux/sched.h>
21 #include <vnet/vnet.h>
22 #include <vnet/vnet_hashtable.h>
23 #include "palacios-vnet.h"
25 #define VNET_SERVER_PORT 9000
32 struct sockaddr_in sock_addr;
33 vnet_brg_proto_t sock_proto;
35 struct nic_statistics stats;
39 struct list_head node;
43 struct vnet_brg_state {
48 struct list_head link_list;
49 struct hashtable *ip2link;
53 struct socket * serv_sock;
54 struct sockaddr_in serv_addr;
55 vnet_brg_proto_t serv_proto;
57 struct task_struct * serv_thread;
59 void * brg_data; /* private data from vnet_core */
61 struct vnet_brg_stats stats;
65 static struct vnet_brg_state vnet_brg_s;
68 int vnet_brg_stats(struct vnet_brg_stats * stats){
69 memcpy(stats, &(vnet_brg_s.stats), sizeof(*stats));
74 static inline struct vnet_link * _link_by_ip(uint32_t ip) {
75 return (struct vnet_link *)vnet_htable_search(vnet_brg_s.ip2link, (addr_t)&ip);
78 static inline struct vnet_link * _link_by_idx(int idx) {
79 struct vnet_link * link = NULL;
81 list_for_each_entry(link, &(vnet_brg_s.link_list), node) {
83 if (link->idx == idx) {
91 static void _delete_link(struct vnet_link * link){
94 link->sock->ops->release(link->sock);
96 spin_lock_irqsave(&(vnet_brg_s.lock), flags);
97 list_del(&(link->node));
98 vnet_htable_remove(vnet_brg_s.ip2link, (addr_t)&(link->dst_ip), 0);
99 vnet_brg_s.num_links --;
100 spin_unlock_irqrestore(&(vnet_brg_s.lock), flags);
102 printk("VNET Bridge: Link deleted, ip 0x%x, port: %d, idx: %d\n",
111 void vnet_brg_delete_link(uint32_t idx){
112 struct vnet_link * link = _link_by_idx(idx);
119 static void deinit_links_list(void){
120 struct vnet_link * link;
122 list_for_each_entry(link, &(vnet_brg_s.link_list), node) {
127 static uint32_t _create_link(struct vnet_link * link) {
132 switch(link->sock_proto){
134 protocol = IPPROTO_UDP;
137 protocol = IPPROTO_TCP;
141 printk("Unsupported VNET Server Protocol\n");
145 if ((err = sock_create(AF_INET, SOCK_DGRAM, protocol, &link->sock)) < 0) {
146 printk("Could not create socket for VNET Link, error %d\n", err);
150 memset(&link->sock_addr, 0, sizeof(struct sockaddr));
152 link->sock_addr.sin_family = AF_INET;
153 link->sock_addr.sin_addr.s_addr = link->dst_ip;
154 link->sock_addr.sin_port = htons(link->dst_port);
156 if ((err = link->sock->ops->connect(link->sock, (struct sockaddr *)&(link->sock_addr), sizeof(struct sockaddr), 0) < 0)) {
157 printk("Could not connect to remote VNET Server, error %d\n", err);
161 spin_lock_irqsave(&(vnet_brg_s.lock), flags);
162 list_add(&(link->node), &(vnet_brg_s.link_list));
163 vnet_brg_s.num_links ++;
164 link->idx = ++ vnet_brg_s.link_idx;
165 vnet_htable_insert(vnet_brg_s.ip2link, (addr_t)&(link->dst_ip), (addr_t)link);
166 spin_unlock_irqrestore(&(vnet_brg_s.lock), flags);
168 printk("VNET Bridge: Link created, ip 0x%x, port: %d, idx: %d, link: %p, protocol: %s\n",
173 ((link->sock_proto==UDP)?"UDP":"TCP"));
179 uint32_t vnet_brg_add_link(uint32_t ip, uint16_t port, vnet_brg_proto_t proto){
180 struct vnet_link * new_link = NULL;
183 new_link = kmalloc(sizeof(struct vnet_link), GFP_KERNEL);
187 memset(new_link, 0, sizeof(struct vnet_link));
189 new_link->dst_ip = ip;
190 new_link->dst_port = port;
191 new_link->sock_proto = proto;
193 idx = _create_link(new_link);
195 printk("Could not create link\n");
204 int vnet_brg_link_stats(uint32_t link_idx, struct nic_statistics * stats){
205 struct vnet_link * link;
207 link = _link_by_idx(link_idx);
212 memcpy(stats, &(link->stats), sizeof(*stats));
219 _udp_send(struct socket * sock,
220 struct sockaddr_in * addr,
221 unsigned char * buf, int len) {
228 if (sock->sk == NULL) {
237 msg.msg_namelen = sizeof(struct sockaddr_in);
238 msg.msg_control = NULL;
239 msg.msg_controllen = 0;
242 msg.msg_control = NULL;
246 size = sock_sendmsg(sock, &msg, len);
255 _udp_recv(struct socket * sock,
256 struct sockaddr_in * addr,
257 unsigned char * buf, int len) {
263 if (sock->sk == NULL) {
272 msg.msg_namelen = sizeof(struct sockaddr_in);
273 msg.msg_control = NULL;
274 msg.msg_controllen = 0;
277 msg.msg_control = NULL;
281 size = sock_recvmsg(sock, &msg, len, msg.msg_flags);
288 /* send packets to VNET core */
290 send_to_palacios(unsigned char * buf,
293 struct v3_vnet_pkt pkt;
295 pkt.src_type = LINK_EDGE;
296 pkt.src_id = link_id;
297 memcpy(pkt.header, buf, ETHERNET_HEADER_LEN);
301 printk("VNET Lnx Bridge: send pkt to VNET core (size: %d, src_id: %d, src_type: %d)\n",
302 pkt.size, pkt.src_id, pkt.src_type);
304 print_hex_dump(NULL, "pkt_data: ", 0, 20, 20, pkt.data, pkt.size, 0);
308 vnet_brg_s.stats.pkt_to_vmm ++;
310 return v3_vnet_send_pkt(&pkt, NULL, 1);
314 /* send packet to extern network */
316 bridge_send_pkt(struct v3_vm_info * vm,
317 struct v3_vnet_pkt * pkt,
318 void * private_data) {
319 struct vnet_link * link;
322 printk("VNET Lnx Host Bridge: packet received from VNET Core ... pkt size: %d, link: %d\n",
326 print_hex_dump(NULL, "pkt_data: ", 0, 20, 20, pkt->data, pkt->size, 0);
330 vnet_brg_s.stats.pkt_from_vmm ++;
332 link = _link_by_idx(pkt->dst_id);
334 switch(link->sock_proto){
336 _udp_send(link->sock, &(link->sock_addr), pkt->data, pkt->size);
337 vnet_brg_s.stats.pkt_to_phy ++;
340 vnet_brg_s.stats.pkt_to_phy ++;
344 printk("VNET Server: Invalid Link Protocol\n");
345 vnet_brg_s.stats.pkt_drop_vmm ++;
347 link->stats.tx_bytes += pkt->size;
348 link->stats.tx_pkts ++;
350 printk("VNET Bridge Linux Host: wrong dst link, idx: %d, discards the packet\n", pkt->dst_id);
351 vnet_brg_s.stats.pkt_drop_vmm ++;
358 static int init_vnet_serv(void) {
362 switch(vnet_brg_s.serv_proto){
364 protocol = IPPROTO_UDP;
367 protocol = IPPROTO_TCP;
371 printk("Unsupported VNET Server Protocol\n");
375 if ((err = sock_create(AF_INET, SOCK_DGRAM, protocol, &vnet_brg_s.serv_sock)) < 0) {
376 printk("Could not create VNET server socket, error: %d\n", err);
380 memset(&vnet_brg_s.serv_addr, 0, sizeof(struct sockaddr));
382 vnet_brg_s.serv_addr.sin_family = AF_INET;
383 vnet_brg_s.serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
384 vnet_brg_s.serv_addr.sin_port = htons(VNET_SERVER_PORT);
386 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) {
387 printk("Could not bind VNET server socket to port %d, error: %d\n", VNET_SERVER_PORT, err);
391 printk("VNET server bind to port: %d\n", VNET_SERVER_PORT);
393 if(vnet_brg_s.serv_proto == TCP){
394 if((err = vnet_brg_s.serv_sock->ops->listen(vnet_brg_s.serv_sock, 32)) < 0){
395 printk("VNET Server error listening on port %d, error %d\n", VNET_SERVER_PORT, err);
403 static int _udp_server(void * arg) {
405 struct sockaddr_in pkt_addr;
406 struct vnet_link * link = NULL;
409 printk("Palacios VNET Bridge: UDP receiving server ..... \n");
411 pkt = kmalloc(MAX_PACKET_LEN, GFP_KERNEL);
412 while (!kthread_should_stop()) {
414 len = _udp_recv(vnet_brg_s.serv_sock, &pkt_addr, pkt, MAX_PACKET_LEN);
416 printk("Receive error: Could not get packet, error %d\n", len);
420 link = _link_by_ip(pkt_addr.sin_addr.s_addr);
422 printk("VNET Server: No VNET Link match the src IP\n");
423 vnet_brg_s.stats.pkt_drop_phy ++;
427 vnet_brg_s.stats.pkt_from_phy ++;
428 link->stats.rx_bytes += len;
429 link->stats.rx_pkts ++;
431 send_to_palacios(pkt, len, link->idx);
440 static int _rx_server(void * arg) {
442 if(vnet_brg_s.serv_proto == UDP){
444 }else if(vnet_brg_s.serv_proto == TCP) {
445 //accept new connection
446 //use select to receive pkt from physical network
447 //or create new kthread to handle each connection?
449 printk ("VNET Server: Unsupported Protocol\n");
456 static inline unsigned int hash_fn(addr_t hdr_ptr) {
457 return vnet_hash_buffer((uint8_t *)hdr_ptr, sizeof(uint32_t));
460 static inline int hash_eq(addr_t key1, addr_t key2) {
461 return (memcmp((uint8_t *)key1, (uint8_t *)key2, sizeof(uint32_t)) == 0);
465 int vnet_bridge_init(void) {
466 struct v3_vnet_bridge_ops bridge_ops;
468 if(vnet_brg_s.status != 0) {
471 vnet_brg_s.status = 1;
473 memset(&vnet_brg_s, 0, sizeof(struct vnet_brg_state));
475 INIT_LIST_HEAD(&(vnet_brg_s.link_list));
476 spin_lock_init(&(vnet_brg_s.lock));
478 vnet_brg_s.serv_proto = UDP;
480 vnet_brg_s.ip2link = vnet_create_htable(10, hash_fn, hash_eq);
481 if(vnet_brg_s.ip2link == NULL){
482 printk("Failure to initiate VNET link hashtable\n");
486 if(init_vnet_serv() < 0){
487 printk("Failure to initiate VNET server\n");
491 vnet_brg_s.serv_thread = kthread_run(_rx_server, NULL, "vnet-server");
493 bridge_ops.input = bridge_send_pkt;
494 bridge_ops.poll = NULL;
496 if( v3_vnet_add_bridge(NULL, &bridge_ops, HOST_LNX_BRIDGE, NULL) < 0){
497 printk("VNET LNX Bridge: Fails to register bridge to VNET core");
500 printk("VNET Linux Bridge initiated\n");
506 void vnet_bridge_deinit(void){
508 v3_vnet_del_bridge(HOST_LNX_BRIDGE);
510 kthread_stop(vnet_brg_s.serv_thread);
511 vnet_brg_s.serv_sock->ops->release(vnet_brg_s.serv_sock);
515 vnet_free_htable(vnet_brg_s.ip2link, 0, 0);
517 vnet_brg_s.status = 0;