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"
27 #define VNET_SERVER_PORT 9000
34 struct sockaddr_in sock_addr;
35 vnet_brg_proto_t sock_proto;
37 struct nic_statistics stats;
41 struct list_head node;
45 struct vnet_brg_state {
50 struct list_head link_list;
51 struct hashtable *ip2link;
55 struct socket * serv_sock;
56 struct sockaddr_in serv_addr;
57 vnet_brg_proto_t serv_proto;
59 struct task_struct * serv_thread;
61 void * brg_data; /* private data from vnet_core */
63 struct vnet_brg_stats stats;
67 static struct vnet_brg_state vnet_brg_s;
70 int vnet_brg_stats(struct vnet_brg_stats * stats){
71 memcpy(stats, &(vnet_brg_s.stats), sizeof(*stats));
76 static inline struct vnet_link * _link_by_ip(uint32_t ip) {
77 return (struct vnet_link *)vnet_htable_search(vnet_brg_s.ip2link, (addr_t)&ip);
80 static inline struct vnet_link * _link_by_idx(int idx) {
81 struct vnet_link * link = NULL;
83 list_for_each_entry(link, &(vnet_brg_s.link_list), node) {
85 if (link->idx == idx) {
93 static void _delete_link(struct vnet_link * link){
96 link->sock->ops->release(link->sock);
98 spin_lock_irqsave(&(vnet_brg_s.lock), flags);
99 list_del(&(link->node));
100 vnet_htable_remove(vnet_brg_s.ip2link, (addr_t)&(link->dst_ip), 0);
101 vnet_brg_s.num_links --;
102 spin_unlock_irqrestore(&(vnet_brg_s.lock), flags);
104 INFO("VNET Bridge: Link deleted, ip 0x%x, port: %d, idx: %d\n",
113 void vnet_brg_delete_link(uint32_t idx){
114 struct vnet_link * link = _link_by_idx(idx);
121 static void deinit_links_list(void){
122 struct vnet_link * link, * tmp_link;
124 list_for_each_entry_safe(link, tmp_link, &(vnet_brg_s.link_list), node) {
129 static uint32_t _create_link(struct vnet_link * link) {
134 switch(link->sock_proto){
136 protocol = IPPROTO_UDP;
139 protocol = IPPROTO_TCP;
143 WARNING("Unsupported VNET Server Protocol\n");
147 if ((err = sock_create(AF_INET, SOCK_DGRAM, protocol, &link->sock)) < 0) {
148 WARNING("Could not create socket for VNET Link, error %d\n", err);
152 memset(&link->sock_addr, 0, sizeof(struct sockaddr));
154 link->sock_addr.sin_family = AF_INET;
155 link->sock_addr.sin_addr.s_addr = link->dst_ip;
156 link->sock_addr.sin_port = htons(link->dst_port);
158 if ((err = link->sock->ops->connect(link->sock, (struct sockaddr *)&(link->sock_addr), sizeof(struct sockaddr), 0) < 0)) {
159 WARNING("Could not connect to remote VNET Server, error %d\n", err);
163 spin_lock_irqsave(&(vnet_brg_s.lock), flags);
164 list_add(&(link->node), &(vnet_brg_s.link_list));
165 vnet_brg_s.num_links ++;
166 link->idx = ++ vnet_brg_s.link_idx;
167 vnet_htable_insert(vnet_brg_s.ip2link, (addr_t)&(link->dst_ip), (addr_t)link);
168 spin_unlock_irqrestore(&(vnet_brg_s.lock), flags);
170 INFO("VNET Bridge: Link created, ip 0x%x, port: %d, idx: %d, link: %p, protocol: %s\n",
175 ((link->sock_proto==UDP)?"UDP":"TCP"));
181 uint32_t vnet_brg_add_link(uint32_t ip, uint16_t port, vnet_brg_proto_t proto){
182 struct vnet_link * new_link = NULL;
185 new_link = kmalloc(sizeof(struct vnet_link), GFP_KERNEL);
189 memset(new_link, 0, sizeof(struct vnet_link));
191 new_link->dst_ip = ip;
192 new_link->dst_port = port;
193 new_link->sock_proto = proto;
195 idx = _create_link(new_link);
197 WARNING("Could not create link\n");
206 int vnet_brg_link_stats(uint32_t link_idx, struct nic_statistics * stats){
207 struct vnet_link * link;
209 link = _link_by_idx(link_idx);
214 memcpy(stats, &(link->stats), sizeof(*stats));
221 _udp_send(struct socket * sock,
222 struct sockaddr_in * addr,
223 unsigned char * buf, int len) {
230 if (sock->sk == NULL) {
239 msg.msg_namelen = sizeof(struct sockaddr_in);
240 msg.msg_control = NULL;
241 msg.msg_controllen = 0;
244 msg.msg_control = NULL;
248 size = sock_sendmsg(sock, &msg, len);
257 _udp_recv(struct socket * sock,
258 struct sockaddr_in * addr,
259 unsigned char * buf, int len) {
265 if (sock->sk == NULL) {
274 msg.msg_namelen = sizeof(struct sockaddr_in);
275 msg.msg_control = NULL;
276 msg.msg_controllen = 0;
279 msg.msg_control = NULL;
283 size = sock_recvmsg(sock, &msg, len, msg.msg_flags);
290 /* send packets to VNET core */
292 send_to_palacios(unsigned char * buf,
295 struct v3_vnet_pkt pkt;
297 pkt.src_type = LINK_EDGE;
298 pkt.src_id = link_id;
299 memcpy(pkt.header, buf, ETHERNET_HEADER_LEN);
303 DEBUG("VNET Lnx Bridge: send pkt to VNET core (size: %d, src_id: %d, src_type: %d)\n",
304 pkt.size, pkt.src_id, pkt.src_type);
306 print_hex_dump(NULL, "pkt_data: ", 0, 20, 20, pkt.data, pkt.size, 0);
310 vnet_brg_s.stats.pkt_to_vmm ++;
312 return v3_vnet_send_pkt(&pkt, NULL);
316 /* send packet to extern network */
318 bridge_send_pkt(struct v3_vm_info * vm,
319 struct v3_vnet_pkt * pkt,
320 void * private_data) {
321 struct vnet_link * link;
324 DEBUG("VNET Lnx Host Bridge: packet received from VNET Core ... pkt size: %d, link: %d\n",
328 print_hex_dump(NULL, "pkt_data: ", 0, 20, 20, pkt->data, pkt->size, 0);
332 vnet_brg_s.stats.pkt_from_vmm ++;
334 link = _link_by_idx(pkt->dst_id);
336 switch(link->sock_proto){
338 _udp_send(link->sock, &(link->sock_addr), pkt->data, pkt->size);
339 vnet_brg_s.stats.pkt_to_phy ++;
342 vnet_brg_s.stats.pkt_to_phy ++;
346 WARNING("VNET Server: Invalid Link Protocol\n");
347 vnet_brg_s.stats.pkt_drop_vmm ++;
349 link->stats.tx_bytes += pkt->size;
350 link->stats.tx_pkts ++;
352 INFO("VNET Bridge Linux Host: wrong dst link, idx: %d, discards the packet\n", pkt->dst_id);
353 vnet_brg_s.stats.pkt_drop_vmm ++;
360 static int init_vnet_serv(void) {
364 switch(vnet_brg_s.serv_proto){
366 protocol = IPPROTO_UDP;
369 protocol = IPPROTO_TCP;
373 WARNING("Unsupported VNET Server Protocol\n");
377 if ((err = sock_create(AF_INET, SOCK_DGRAM, protocol, &vnet_brg_s.serv_sock)) < 0) {
378 WARNING("Could not create VNET server socket, error: %d\n", err);
382 memset(&vnet_brg_s.serv_addr, 0, sizeof(struct sockaddr));
384 vnet_brg_s.serv_addr.sin_family = AF_INET;
385 vnet_brg_s.serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
386 vnet_brg_s.serv_addr.sin_port = htons(VNET_SERVER_PORT);
388 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) {
389 WARNING("Could not bind VNET server socket to port %d, error: %d\n", VNET_SERVER_PORT, err);
393 INFO("VNET server bind to port: %d\n", VNET_SERVER_PORT);
395 if(vnet_brg_s.serv_proto == TCP){
396 if((err = vnet_brg_s.serv_sock->ops->listen(vnet_brg_s.serv_sock, 32)) < 0){
397 WARNING("VNET Server error listening on port %d, error %d\n", VNET_SERVER_PORT, err);
405 static int _udp_server(void * arg) {
407 struct sockaddr_in pkt_addr;
408 struct vnet_link * link = NULL;
411 INFO("Palacios VNET Bridge: UDP receiving server ..... \n");
413 pkt = kmalloc(MAX_PACKET_LEN, GFP_KERNEL);
414 while (!kthread_should_stop()) {
416 len = _udp_recv(vnet_brg_s.serv_sock, &pkt_addr, pkt, MAX_PACKET_LEN);
418 WARNING("Receive error: Could not get packet, error %d\n", len);
422 link = _link_by_ip(pkt_addr.sin_addr.s_addr);
424 WARNING("VNET Server: No VNET Link match the src IP\n");
425 vnet_brg_s.stats.pkt_drop_phy ++;
429 vnet_brg_s.stats.pkt_from_phy ++;
430 link->stats.rx_bytes += len;
431 link->stats.rx_pkts ++;
433 send_to_palacios(pkt, len, link->idx);
442 static int _rx_server(void * arg) {
444 if(vnet_brg_s.serv_proto == UDP){
446 }else if(vnet_brg_s.serv_proto == TCP) {
447 //accept new connection
448 //use select to receive pkt from physical network
449 //or create new kthread to handle each connection?
451 WARNING ("VNET Server: Unsupported Protocol\n");
458 static inline unsigned int hash_fn(addr_t hdr_ptr) {
459 return vnet_hash_buffer((uint8_t *)hdr_ptr, sizeof(uint32_t));
462 static inline int hash_eq(addr_t key1, addr_t key2) {
463 return (memcmp((uint8_t *)key1, (uint8_t *)key2, sizeof(uint32_t)) == 0);
467 int vnet_bridge_init(void) {
468 struct v3_vnet_bridge_ops bridge_ops;
470 if(vnet_brg_s.status != 0) {
473 vnet_brg_s.status = 1;
475 memset(&vnet_brg_s, 0, sizeof(struct vnet_brg_state));
477 INIT_LIST_HEAD(&(vnet_brg_s.link_list));
478 spin_lock_init(&(vnet_brg_s.lock));
480 vnet_brg_s.serv_proto = UDP;
482 vnet_brg_s.ip2link = vnet_create_htable(10, hash_fn, hash_eq);
483 if(vnet_brg_s.ip2link == NULL){
484 WARNING("Failure to initiate VNET link hashtable\n");
488 if(init_vnet_serv() < 0){
489 WARNING("Failure to initiate VNET server\n");
493 vnet_brg_s.serv_thread = kthread_run(_rx_server, NULL, "vnet_brgd");
495 bridge_ops.input = bridge_send_pkt;
496 bridge_ops.poll = NULL;
498 if( v3_vnet_add_bridge(NULL, &bridge_ops, HOST_LNX_BRIDGE, NULL) < 0){
499 WARNING("VNET LNX Bridge: Fails to register bridge to VNET core");
502 INFO("VNET Linux Bridge initiated\n");
508 void vnet_bridge_deinit(void){
510 v3_vnet_del_bridge(HOST_LNX_BRIDGE);
512 kthread_stop(vnet_brg_s.serv_thread);
513 vnet_brg_s.serv_sock->ops->release(vnet_brg_s.serv_sock);
517 vnet_free_htable(vnet_brg_s.ip2link, 0, 0);
519 vnet_brg_s.status = 0;