Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Common framework for low-level network console, dump, and debugger code |
| 3 | * |
| 4 | * Sep 8 2003 Matt Mackall <mpm@selenic.com> |
| 5 | * |
| 6 | * based on the netconsole code from: |
| 7 | * |
| 8 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> |
| 9 | * Copyright (C) 2002 Red Hat, Inc. |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/netdevice.h> |
| 13 | #include <linux/etherdevice.h> |
| 14 | #include <linux/string.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 15 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/inetdevice.h> |
| 17 | #include <linux/inet.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/netpoll.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/rcupdate.h> |
| 23 | #include <linux/workqueue.h> |
| 24 | #include <net/tcp.h> |
| 25 | #include <net/udp.h> |
| 26 | #include <asm/unaligned.h> |
| 27 | |
| 28 | /* |
| 29 | * We maintain a small pool of fully-sized skbs, to make sure the |
| 30 | * message gets out even in extreme OOM situations. |
| 31 | */ |
| 32 | |
| 33 | #define MAX_UDP_CHUNK 1460 |
| 34 | #define MAX_SKBS 32 |
| 35 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) |
| 36 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 37 | static struct sk_buff_head skb_pool; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | static atomic_t trapped; |
| 40 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 41 | #define USEC_PER_POLL 50 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #define NETPOLL_RX_ENABLED 1 |
| 43 | #define NETPOLL_RX_DROP 2 |
| 44 | |
| 45 | #define MAX_SKB_SIZE \ |
| 46 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ |
| 47 | sizeof(struct iphdr) + sizeof(struct ethhdr)) |
| 48 | |
| 49 | static void zap_completion_queue(void); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 50 | static void arp_reply(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 52 | static void queue_process(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | { |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 54 | struct netpoll_info *npinfo = |
| 55 | container_of(work, struct netpoll_info, tx_work.work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | struct sk_buff *skb; |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 57 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 59 | while ((skb = skb_dequeue(&npinfo->txq))) { |
| 60 | struct net_device *dev = skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 62 | if (!netif_device_present(dev) || !netif_running(dev)) { |
| 63 | __kfree_skb(skb); |
| 64 | continue; |
| 65 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 67 | local_irq_save(flags); |
| 68 | netif_tx_lock(dev); |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 69 | if ((netif_queue_stopped(dev) || |
| 70 | netif_subqueue_stopped(dev, skb->queue_mapping)) || |
| 71 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 72 | skb_queue_head(&npinfo->txq, skb); |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 73 | netif_tx_unlock(dev); |
| 74 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Jarek Poplawski | 25442ca | 2007-07-05 17:42:44 -0700 | [diff] [blame] | 76 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
Stephen Hemminger | 6c43ff1 | 2006-10-26 15:46:53 -0700 | [diff] [blame] | 77 | return; |
| 78 | } |
Ingo Molnar | 3640543 | 2006-12-12 17:20:42 +0100 | [diff] [blame] | 79 | netif_tx_unlock(dev); |
| 80 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
| 82 | } |
| 83 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 84 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
| 85 | unsigned short ulen, __be32 saddr, __be32 daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
Al Viro | d6f5493c | 2006-11-14 21:26:08 -0800 | [diff] [blame] | 87 | __wsum psum; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 88 | |
Herbert Xu | 6047637 | 2007-04-09 11:59:39 -0700 | [diff] [blame] | 89 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | return 0; |
| 91 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 92 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 94 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 95 | !csum_fold(csum_add(psum, skb->csum))) |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 96 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 98 | skb->csum = psum; |
| 99 | |
| 100 | return __skb_checksum_complete(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Check whether delayed processing was scheduled for our NIC. If so, |
| 105 | * we attempt to grab the poll lock and use ->poll() to pump the card. |
| 106 | * If this fails, either we've recursed in ->poll() or it's already |
| 107 | * running on another CPU. |
| 108 | * |
| 109 | * Note: we don't mask interrupts with this lock because we're using |
| 110 | * trylock here and interrupts are already disabled in the softirq |
| 111 | * case. Further, we test the poll_owner to avoid recursion on UP |
| 112 | * systems where the lock doesn't exist. |
| 113 | * |
| 114 | * In cases where there is bi-directional communications, reading only |
| 115 | * one message at a time can lead to packets being dropped by the |
| 116 | * network adapter, forcing superfluous retries and possibly timeouts. |
| 117 | * Thus, we set our budget to greater than 1. |
| 118 | */ |
| 119 | static void poll_napi(struct netpoll *np) |
| 120 | { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 121 | struct netpoll_info *npinfo = np->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | int budget = 16; |
| 123 | |
| 124 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 125 | npinfo->poll_owner != smp_processor_id() && |
| 126 | spin_trylock(&npinfo->poll_lock)) { |
Olaf Kirch | 2957862 | 2007-07-11 19:32:02 -0700 | [diff] [blame] | 127 | /* When calling dev->poll from poll_napi, we may end up in |
| 128 | * netif_rx_complete. However, only the CPU to which the |
| 129 | * device was queued is allowed to remove it from poll_list. |
| 130 | * Setting POLL_LIST_FROZEN tells netif_rx_complete |
| 131 | * to leave the NAPI state alone. |
| 132 | */ |
| 133 | set_bit(__LINK_STATE_POLL_LIST_FROZEN, &np->dev->state); |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 134 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | atomic_inc(&trapped); |
| 136 | |
| 137 | np->dev->poll(np->dev, &budget); |
| 138 | |
| 139 | atomic_dec(&trapped); |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 140 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
Olaf Kirch | 2957862 | 2007-07-11 19:32:02 -0700 | [diff] [blame] | 141 | clear_bit(__LINK_STATE_POLL_LIST_FROZEN, &np->dev->state); |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 142 | spin_unlock(&npinfo->poll_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | } |
| 144 | } |
| 145 | |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 146 | static void service_arp_queue(struct netpoll_info *npi) |
| 147 | { |
| 148 | struct sk_buff *skb; |
| 149 | |
| 150 | if (unlikely(!npi)) |
| 151 | return; |
| 152 | |
| 153 | skb = skb_dequeue(&npi->arp_tx); |
| 154 | |
| 155 | while (skb != NULL) { |
| 156 | arp_reply(skb); |
| 157 | skb = skb_dequeue(&npi->arp_tx); |
| 158 | } |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 159 | } |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | void netpoll_poll(struct netpoll *np) |
| 162 | { |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 163 | if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | return; |
| 165 | |
| 166 | /* Process pending work on NIC */ |
| 167 | np->dev->poll_controller(np->dev); |
| 168 | if (np->dev->poll) |
| 169 | poll_napi(np); |
| 170 | |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 171 | service_arp_queue(np->dev->npinfo); |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | zap_completion_queue(); |
| 174 | } |
| 175 | |
| 176 | static void refill_skbs(void) |
| 177 | { |
| 178 | struct sk_buff *skb; |
| 179 | unsigned long flags; |
| 180 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 181 | spin_lock_irqsave(&skb_pool.lock, flags); |
| 182 | while (skb_pool.qlen < MAX_SKBS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
| 184 | if (!skb) |
| 185 | break; |
| 186 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 187 | __skb_queue_tail(&skb_pool, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 189 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | static void zap_completion_queue(void) |
| 193 | { |
| 194 | unsigned long flags; |
| 195 | struct softnet_data *sd = &get_cpu_var(softnet_data); |
| 196 | |
| 197 | if (sd->completion_queue) { |
| 198 | struct sk_buff *clist; |
| 199 | |
| 200 | local_irq_save(flags); |
| 201 | clist = sd->completion_queue; |
| 202 | sd->completion_queue = NULL; |
| 203 | local_irq_restore(flags); |
| 204 | |
| 205 | while (clist != NULL) { |
| 206 | struct sk_buff *skb = clist; |
| 207 | clist = clist->next; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 208 | if (skb->destructor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | dev_kfree_skb_any(skb); /* put this one back */ |
| 210 | else |
| 211 | __kfree_skb(skb); |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | put_cpu_var(softnet_data); |
| 216 | } |
| 217 | |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 218 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 220 | int count = 0; |
| 221 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | zap_completion_queue(); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 224 | refill_skbs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | repeat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
| 227 | skb = alloc_skb(len, GFP_ATOMIC); |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 228 | if (!skb) |
| 229 | skb = skb_dequeue(&skb_pool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
| 231 | if (!skb) { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 232 | if (++count < 10) { |
| 233 | netpoll_poll(np); |
| 234 | goto repeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 236 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | atomic_set(&skb->users, 1); |
| 240 | skb_reserve(skb, reserve); |
| 241 | return skb; |
| 242 | } |
| 243 | |
| 244 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
| 245 | { |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 246 | int status = NETDEV_TX_BUSY; |
| 247 | unsigned long tries; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 248 | struct net_device *dev = np->dev; |
| 249 | struct netpoll_info *npinfo = np->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 251 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
| 252 | __kfree_skb(skb); |
| 253 | return; |
| 254 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 256 | /* don't get messages out of order, and no recursion */ |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 257 | if (skb_queue_len(&npinfo->txq) == 0 && |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 258 | npinfo->poll_owner != smp_processor_id()) { |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 259 | unsigned long flags; |
| 260 | |
| 261 | local_irq_save(flags); |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 262 | /* try until next clock tick */ |
| 263 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; |
| 264 | tries > 0; --tries) { |
| 265 | if (netif_tx_trylock(dev)) { |
Peter P Waskiewicz Jr | f25f4e4 | 2007-07-06 13:36:20 -0700 | [diff] [blame] | 266 | if (!netif_queue_stopped(dev) && |
| 267 | !netif_subqueue_stopped(dev, skb->queue_mapping)) |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 268 | status = dev->hard_start_xmit(skb, dev); |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 269 | netif_tx_unlock(dev); |
Matt Mackall | f0d3459 | 2005-08-11 19:25:11 -0700 | [diff] [blame] | 270 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 271 | if (status == NETDEV_TX_OK) |
| 272 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
Andrew Morton | e37b8d9 | 2006-12-09 14:01:49 -0800 | [diff] [blame] | 274 | } |
Stephen Hemminger | 0db3dc7 | 2007-06-27 00:39:42 -0700 | [diff] [blame] | 275 | |
| 276 | /* tickle device maybe there is some cleanup */ |
| 277 | netpoll_poll(np); |
| 278 | |
| 279 | udelay(USEC_PER_POLL); |
Matt Mackall | 0db1d6f | 2005-08-11 19:25:54 -0700 | [diff] [blame] | 280 | } |
Andrew Morton | a49f99f | 2006-12-11 17:24:46 -0800 | [diff] [blame] | 281 | local_irq_restore(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 284 | if (status != NETDEV_TX_OK) { |
Stephen Hemminger | 5de4a47 | 2006-10-26 15:46:55 -0700 | [diff] [blame] | 285 | skb_queue_tail(&npinfo->txq, skb); |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 286 | schedule_delayed_work(&npinfo->tx_work,0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) |
| 291 | { |
| 292 | int total_len, eth_len, ip_len, udp_len; |
| 293 | struct sk_buff *skb; |
| 294 | struct udphdr *udph; |
| 295 | struct iphdr *iph; |
| 296 | struct ethhdr *eth; |
| 297 | |
| 298 | udp_len = len + sizeof(*udph); |
| 299 | ip_len = eth_len = udp_len + sizeof(*iph); |
| 300 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; |
| 301 | |
| 302 | skb = find_skb(np, total_len, total_len - len); |
| 303 | if (!skb) |
| 304 | return; |
| 305 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 306 | skb_copy_to_linear_data(skb, msg, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | skb->len += len; |
| 308 | |
Arnaldo Carvalho de Melo | 4bedb45 | 2007-03-13 14:28:48 -0300 | [diff] [blame] | 309 | skb_push(skb, sizeof(*udph)); |
| 310 | skb_reset_transport_header(skb); |
| 311 | udph = udp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | udph->source = htons(np->local_port); |
| 313 | udph->dest = htons(np->remote_port); |
| 314 | udph->len = htons(udp_len); |
| 315 | udph->check = 0; |
Chris Lalancette | 8e365ee | 2006-11-07 14:56:19 -0800 | [diff] [blame] | 316 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
| 317 | htonl(np->remote_ip), |
| 318 | udp_len, IPPROTO_UDP, |
| 319 | csum_partial((unsigned char *)udph, udp_len, 0)); |
| 320 | if (udph->check == 0) |
Al Viro | 5e57dff | 2006-11-20 18:08:13 -0800 | [diff] [blame] | 321 | udph->check = CSUM_MANGLED_0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 323 | skb_push(skb, sizeof(*iph)); |
| 324 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 325 | iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | /* iph->version = 4; iph->ihl = 5; */ |
| 328 | put_unaligned(0x45, (unsigned char *)iph); |
| 329 | iph->tos = 0; |
| 330 | put_unaligned(htons(ip_len), &(iph->tot_len)); |
| 331 | iph->id = 0; |
| 332 | iph->frag_off = 0; |
| 333 | iph->ttl = 64; |
| 334 | iph->protocol = IPPROTO_UDP; |
| 335 | iph->check = 0; |
| 336 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); |
| 337 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); |
| 338 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
| 339 | |
| 340 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 341 | skb_reset_mac_header(skb); |
Stephen Hemminger | 206daaf | 2006-10-19 23:58:23 -0700 | [diff] [blame] | 342 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | memcpy(eth->h_source, np->local_mac, 6); |
| 344 | memcpy(eth->h_dest, np->remote_mac, 6); |
| 345 | |
| 346 | skb->dev = np->dev; |
| 347 | |
| 348 | netpoll_send_skb(np, skb); |
| 349 | } |
| 350 | |
| 351 | static void arp_reply(struct sk_buff *skb) |
| 352 | { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 353 | struct netpoll_info *npinfo = skb->dev->npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | struct arphdr *arp; |
| 355 | unsigned char *arp_ptr; |
| 356 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; |
Al Viro | 252e334 | 2006-11-14 20:48:11 -0800 | [diff] [blame] | 357 | __be32 sip, tip; |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 358 | unsigned char *sha; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | struct sk_buff *send_skb; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 360 | struct netpoll *np = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 362 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
| 363 | np = npinfo->rx_np; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 364 | if (!np) |
| 365 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
| 367 | /* No arp on this interface */ |
| 368 | if (skb->dev->flags & IFF_NOARP) |
| 369 | return; |
| 370 | |
| 371 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + |
| 372 | (2 * skb->dev->addr_len) + |
| 373 | (2 * sizeof(u32))))) |
| 374 | return; |
| 375 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 376 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 377 | skb_reset_transport_header(skb); |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 378 | arp = arp_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
| 381 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || |
| 382 | arp->ar_pro != htons(ETH_P_IP) || |
| 383 | arp->ar_op != htons(ARPOP_REQUEST)) |
| 384 | return; |
| 385 | |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 386 | arp_ptr = (unsigned char *)(arp+1); |
| 387 | /* save the location of the src hw addr */ |
| 388 | sha = arp_ptr; |
| 389 | arp_ptr += skb->dev->addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | memcpy(&sip, arp_ptr, 4); |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 391 | arp_ptr += 4; |
| 392 | /* if we actually cared about dst hw addr, it would get copied here */ |
| 393 | arp_ptr += skb->dev->addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | memcpy(&tip, arp_ptr, 4); |
| 395 | |
| 396 | /* Should we ignore arp? */ |
| 397 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) |
| 398 | return; |
| 399 | |
| 400 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); |
| 401 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), |
| 402 | LL_RESERVED_SPACE(np->dev)); |
| 403 | |
| 404 | if (!send_skb) |
| 405 | return; |
| 406 | |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 407 | skb_reset_network_header(send_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | arp = (struct arphdr *) skb_put(send_skb, size); |
| 409 | send_skb->dev = skb->dev; |
| 410 | send_skb->protocol = htons(ETH_P_ARP); |
| 411 | |
| 412 | /* Fill the device header for the ARP frame */ |
| 413 | |
| 414 | if (np->dev->hard_header && |
| 415 | np->dev->hard_header(send_skb, skb->dev, ptype, |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 416 | sha, np->local_mac, |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 417 | send_skb->len) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | kfree_skb(send_skb); |
| 419 | return; |
| 420 | } |
| 421 | |
| 422 | /* |
| 423 | * Fill out the arp protocol part. |
| 424 | * |
| 425 | * we only support ethernet device type, |
| 426 | * which (according to RFC 1390) should always equal 1 (Ethernet). |
| 427 | */ |
| 428 | |
| 429 | arp->ar_hrd = htons(np->dev->type); |
| 430 | arp->ar_pro = htons(ETH_P_IP); |
| 431 | arp->ar_hln = np->dev->addr_len; |
| 432 | arp->ar_pln = 4; |
| 433 | arp->ar_op = htons(type); |
| 434 | |
| 435 | arp_ptr=(unsigned char *)(arp + 1); |
| 436 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); |
| 437 | arp_ptr += np->dev->addr_len; |
| 438 | memcpy(arp_ptr, &tip, 4); |
| 439 | arp_ptr += 4; |
Neil Horman | 47bbec0 | 2006-12-08 00:05:55 -0800 | [diff] [blame] | 440 | memcpy(arp_ptr, sha, np->dev->addr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | arp_ptr += np->dev->addr_len; |
| 442 | memcpy(arp_ptr, &sip, 4); |
| 443 | |
| 444 | netpoll_send_skb(np, send_skb); |
| 445 | } |
| 446 | |
| 447 | int __netpoll_rx(struct sk_buff *skb) |
| 448 | { |
| 449 | int proto, len, ulen; |
| 450 | struct iphdr *iph; |
| 451 | struct udphdr *uh; |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 452 | struct netpoll_info *npi = skb->dev->npinfo; |
| 453 | struct netpoll *np = npi->rx_np; |
| 454 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 455 | if (!np) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | goto out; |
| 457 | if (skb->dev->type != ARPHRD_ETHER) |
| 458 | goto out; |
| 459 | |
| 460 | /* check if netpoll clients need ARP */ |
YOSHIFUJI Hideaki | 724800d | 2007-03-25 20:13:04 -0700 | [diff] [blame] | 461 | if (skb->protocol == htons(ETH_P_ARP) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | atomic_read(&trapped)) { |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 463 | skb_queue_tail(&npi->arp_tx, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | return 1; |
| 465 | } |
| 466 | |
| 467 | proto = ntohs(eth_hdr(skb)->h_proto); |
| 468 | if (proto != ETH_P_IP) |
| 469 | goto out; |
| 470 | if (skb->pkt_type == PACKET_OTHERHOST) |
| 471 | goto out; |
| 472 | if (skb_shared(skb)) |
| 473 | goto out; |
| 474 | |
| 475 | iph = (struct iphdr *)skb->data; |
| 476 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 477 | goto out; |
| 478 | if (iph->ihl < 5 || iph->version != 4) |
| 479 | goto out; |
| 480 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 481 | goto out; |
| 482 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
| 483 | goto out; |
| 484 | |
| 485 | len = ntohs(iph->tot_len); |
| 486 | if (skb->len < len || len < iph->ihl*4) |
| 487 | goto out; |
| 488 | |
Aubrey.Li | 5e7d7fa | 2007-04-17 12:40:20 -0700 | [diff] [blame] | 489 | /* |
| 490 | * Our transport medium may have padded the buffer out. |
| 491 | * Now We trim to the true length of the frame. |
| 492 | */ |
| 493 | if (pskb_trim_rcsum(skb, len)) |
| 494 | goto out; |
| 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | if (iph->protocol != IPPROTO_UDP) |
| 497 | goto out; |
| 498 | |
| 499 | len -= iph->ihl*4; |
| 500 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); |
| 501 | ulen = ntohs(uh->len); |
| 502 | |
| 503 | if (ulen != len) |
| 504 | goto out; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 505 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | goto out; |
| 507 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) |
| 508 | goto out; |
| 509 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) |
| 510 | goto out; |
| 511 | if (np->local_port && np->local_port != ntohs(uh->dest)) |
| 512 | goto out; |
| 513 | |
| 514 | np->rx_hook(np, ntohs(uh->source), |
| 515 | (char *)(uh+1), |
| 516 | ulen - sizeof(struct udphdr)); |
| 517 | |
| 518 | kfree_skb(skb); |
| 519 | return 1; |
| 520 | |
| 521 | out: |
| 522 | if (atomic_read(&trapped)) { |
| 523 | kfree_skb(skb); |
| 524 | return 1; |
| 525 | } |
| 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | int netpoll_parse_options(struct netpoll *np, char *opt) |
| 531 | { |
| 532 | char *cur=opt, *delim; |
| 533 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 534 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | if ((delim = strchr(cur, '@')) == NULL) |
| 536 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 537 | *delim = 0; |
| 538 | np->local_port = simple_strtol(cur, NULL, 10); |
| 539 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | cur++; |
| 542 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); |
| 543 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 544 | if (*cur != '/') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | if ((delim = strchr(cur, '/')) == NULL) |
| 546 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 547 | *delim = 0; |
| 548 | np->local_ip = ntohl(in_aton(cur)); |
| 549 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
| 551 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", |
| 552 | np->name, HIPQUAD(np->local_ip)); |
| 553 | } |
| 554 | cur++; |
| 555 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 556 | if (*cur != ',') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | /* parse out dev name */ |
| 558 | if ((delim = strchr(cur, ',')) == NULL) |
| 559 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 560 | *delim = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 562 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | cur++; |
| 565 | |
| 566 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); |
| 567 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 568 | if (*cur != '@') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | /* dst port */ |
| 570 | if ((delim = strchr(cur, '@')) == NULL) |
| 571 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 572 | *delim = 0; |
| 573 | np->remote_port = simple_strtol(cur, NULL, 10); |
| 574 | cur = delim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
| 576 | cur++; |
| 577 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); |
| 578 | |
| 579 | /* dst ip */ |
| 580 | if ((delim = strchr(cur, '/')) == NULL) |
| 581 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 582 | *delim = 0; |
| 583 | np->remote_ip = ntohl(in_aton(cur)); |
| 584 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
| 586 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 587 | np->name, HIPQUAD(np->remote_ip)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 589 | if (*cur != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | /* MAC address */ |
| 591 | if ((delim = strchr(cur, ':')) == NULL) |
| 592 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 593 | *delim = 0; |
| 594 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); |
| 595 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | if ((delim = strchr(cur, ':')) == NULL) |
| 597 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 598 | *delim = 0; |
| 599 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); |
| 600 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | if ((delim = strchr(cur, ':')) == NULL) |
| 602 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 603 | *delim = 0; |
| 604 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); |
| 605 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | if ((delim = strchr(cur, ':')) == NULL) |
| 607 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 608 | *delim = 0; |
| 609 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); |
| 610 | cur = delim + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if ((delim = strchr(cur, ':')) == NULL) |
| 612 | goto parse_failed; |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 613 | *delim = 0; |
| 614 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); |
| 615 | cur = delim + 1; |
| 616 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | |
| 619 | printk(KERN_INFO "%s: remote ethernet address " |
| 620 | "%02x:%02x:%02x:%02x:%02x:%02x\n", |
| 621 | np->name, |
| 622 | np->remote_mac[0], |
| 623 | np->remote_mac[1], |
| 624 | np->remote_mac[2], |
| 625 | np->remote_mac[3], |
| 626 | np->remote_mac[4], |
| 627 | np->remote_mac[5]); |
| 628 | |
| 629 | return 0; |
| 630 | |
| 631 | parse_failed: |
| 632 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", |
| 633 | np->name, cur); |
| 634 | return -1; |
| 635 | } |
| 636 | |
| 637 | int netpoll_setup(struct netpoll *np) |
| 638 | { |
| 639 | struct net_device *ndev = NULL; |
| 640 | struct in_device *in_dev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 641 | struct netpoll_info *npinfo; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 642 | unsigned long flags; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 643 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
| 645 | if (np->dev_name) |
| 646 | ndev = dev_get_by_name(np->dev_name); |
| 647 | if (!ndev) { |
| 648 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", |
| 649 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 650 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | np->dev = ndev; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 654 | if (!ndev->npinfo) { |
| 655 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 656 | if (!npinfo) { |
| 657 | err = -ENOMEM; |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 658 | goto release; |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 659 | } |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 660 | |
Jeff Moyer | 1151312 | 2005-08-11 19:23:04 -0700 | [diff] [blame] | 661 | npinfo->rx_flags = 0; |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 662 | npinfo->rx_np = NULL; |
Ingo Molnar | a9f6a0d | 2005-09-09 13:10:41 -0700 | [diff] [blame] | 663 | spin_lock_init(&npinfo->poll_lock); |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 664 | npinfo->poll_owner = -1; |
Stephen Hemminger | 2bdfe0b | 2006-10-26 15:46:54 -0700 | [diff] [blame] | 665 | |
Ingo Molnar | a9f6a0d | 2005-09-09 13:10:41 -0700 | [diff] [blame] | 666 | spin_lock_init(&npinfo->rx_lock); |
Neil Horman | 068c6e9 | 2006-06-26 00:04:27 -0700 | [diff] [blame] | 667 | skb_queue_head_init(&npinfo->arp_tx); |
Stephen Hemminger | b6cd27e | 2006-10-26 15:46:51 -0700 | [diff] [blame] | 668 | skb_queue_head_init(&npinfo->txq); |
David Howells | 4c1ac1b | 2006-12-05 14:37:56 +0000 | [diff] [blame] | 669 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
Stephen Hemminger | b6cd27e | 2006-10-26 15:46:51 -0700 | [diff] [blame] | 670 | |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 671 | atomic_set(&npinfo->refcnt, 1); |
| 672 | } else { |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 673 | npinfo = ndev->npinfo; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 674 | atomic_inc(&npinfo->refcnt); |
| 675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
| 677 | if (!ndev->poll_controller) { |
| 678 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
| 679 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 680 | err = -ENOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | goto release; |
| 682 | } |
| 683 | |
| 684 | if (!netif_running(ndev)) { |
| 685 | unsigned long atmost, atleast; |
| 686 | |
| 687 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", |
| 688 | np->name, np->dev_name); |
| 689 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 690 | rtnl_lock(); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 691 | err = dev_open(ndev); |
| 692 | rtnl_unlock(); |
| 693 | |
| 694 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | printk(KERN_ERR "%s: failed to open %s\n", |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 696 | np->name, ndev->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | goto release; |
| 698 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | atleast = jiffies + HZ/10; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 701 | atmost = jiffies + 4*HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | while (!netif_carrier_ok(ndev)) { |
| 703 | if (time_after(jiffies, atmost)) { |
| 704 | printk(KERN_NOTICE |
| 705 | "%s: timeout waiting for carrier\n", |
| 706 | np->name); |
| 707 | break; |
| 708 | } |
| 709 | cond_resched(); |
| 710 | } |
| 711 | |
| 712 | /* If carrier appears to come up instantly, we don't |
| 713 | * trust it and pause so that we don't pump all our |
| 714 | * queued console messages into the bitbucket. |
| 715 | */ |
| 716 | |
| 717 | if (time_before(jiffies, atleast)) { |
| 718 | printk(KERN_NOTICE "%s: carrier detect appears" |
| 719 | " untrustworthy, waiting 4 seconds\n", |
| 720 | np->name); |
| 721 | msleep(4000); |
| 722 | } |
| 723 | } |
| 724 | |
Kris Katterjohn | 3860288 | 2006-01-17 15:15:38 -0800 | [diff] [blame] | 725 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | memcpy(np->local_mac, ndev->dev_addr, 6); |
| 727 | |
| 728 | if (!np->local_ip) { |
| 729 | rcu_read_lock(); |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 730 | in_dev = __in_dev_get_rcu(ndev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
| 732 | if (!in_dev || !in_dev->ifa_list) { |
| 733 | rcu_read_unlock(); |
| 734 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", |
| 735 | np->name, np->dev_name); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 736 | err = -EDESTADDRREQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | goto release; |
| 738 | } |
| 739 | |
| 740 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); |
| 741 | rcu_read_unlock(); |
| 742 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", |
| 743 | np->name, HIPQUAD(np->local_ip)); |
| 744 | } |
| 745 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 746 | if (np->rx_hook) { |
| 747 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 748 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
| 749 | npinfo->rx_np = np; |
| 750 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 751 | } |
Ingo Molnar | 2652076 | 2005-08-11 19:26:42 -0700 | [diff] [blame] | 752 | |
| 753 | /* fill up the skb queue */ |
| 754 | refill_skbs(); |
| 755 | |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 756 | /* last thing to do is link it to the net device structure */ |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 757 | ndev->npinfo = npinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
Matt Mackall | 53fb95d | 2005-08-11 19:27:43 -0700 | [diff] [blame] | 759 | /* avoid racing with NAPI reading npinfo */ |
| 760 | synchronize_rcu(); |
| 761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | return 0; |
| 763 | |
| 764 | release: |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 765 | if (!ndev->npinfo) |
| 766 | kfree(npinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | np->dev = NULL; |
| 768 | dev_put(ndev); |
Stephen Hemminger | b41848b | 2006-10-26 15:46:52 -0700 | [diff] [blame] | 769 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | |
David S. Miller | c68b907 | 2006-11-14 20:40:49 -0800 | [diff] [blame] | 772 | static int __init netpoll_init(void) |
| 773 | { |
Stephen Hemminger | a1bcfac | 2006-11-14 10:43:58 -0800 | [diff] [blame] | 774 | skb_queue_head_init(&skb_pool); |
| 775 | return 0; |
| 776 | } |
| 777 | core_initcall(netpoll_init); |
| 778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | void netpoll_cleanup(struct netpoll *np) |
| 780 | { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 781 | struct netpoll_info *npinfo; |
| 782 | unsigned long flags; |
| 783 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 784 | if (np->dev) { |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 785 | npinfo = np->dev->npinfo; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 786 | if (npinfo) { |
| 787 | if (npinfo->rx_np == np) { |
| 788 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
| 789 | npinfo->rx_np = NULL; |
| 790 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
| 791 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
| 792 | } |
| 793 | |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 794 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
| 795 | skb_queue_purge(&npinfo->arp_tx); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 796 | skb_queue_purge(&npinfo->txq); |
Jarek Poplawski | 25442ca | 2007-07-05 17:42:44 -0700 | [diff] [blame] | 797 | cancel_rearming_delayed_work(&npinfo->tx_work); |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 798 | |
Jarek Poplawski | 1720081 | 2007-06-28 22:11:47 -0700 | [diff] [blame] | 799 | /* clean after last, unfinished work */ |
| 800 | if (!skb_queue_empty(&npinfo->txq)) { |
| 801 | struct sk_buff *skb; |
| 802 | skb = __skb_dequeue(&npinfo->txq); |
| 803 | kfree_skb(skb); |
| 804 | } |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 805 | kfree(npinfo); |
Satyam Sharma | 1498b3f | 2007-07-09 15:22:23 -0700 | [diff] [blame] | 806 | np->dev->npinfo = NULL; |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 807 | } |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 808 | } |
Stephen Hemminger | 93ec2c7 | 2006-10-26 15:46:50 -0700 | [diff] [blame] | 809 | |
Jeff Moyer | 115c1d6 | 2005-06-22 22:05:31 -0700 | [diff] [blame] | 810 | dev_put(np->dev); |
| 811 | } |
Jeff Moyer | fbeec2e | 2005-06-22 22:05:59 -0700 | [diff] [blame] | 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | np->dev = NULL; |
| 814 | } |
| 815 | |
| 816 | int netpoll_trap(void) |
| 817 | { |
| 818 | return atomic_read(&trapped); |
| 819 | } |
| 820 | |
| 821 | void netpoll_set_trap(int trap) |
| 822 | { |
| 823 | if (trap) |
| 824 | atomic_inc(&trapped); |
| 825 | else |
| 826 | atomic_dec(&trapped); |
| 827 | } |
| 828 | |
| 829 | EXPORT_SYMBOL(netpoll_set_trap); |
| 830 | EXPORT_SYMBOL(netpoll_trap); |
| 831 | EXPORT_SYMBOL(netpoll_parse_options); |
| 832 | EXPORT_SYMBOL(netpoll_setup); |
| 833 | EXPORT_SYMBOL(netpoll_cleanup); |
| 834 | EXPORT_SYMBOL(netpoll_send_udp); |
| 835 | EXPORT_SYMBOL(netpoll_poll); |