diff options
Diffstat (limited to 'drivers/net/tun.c')
| -rw-r--r-- | drivers/net/tun.c | 198 |
1 files changed, 108 insertions, 90 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index a74661690a11..4884802e0af1 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -131,6 +131,17 @@ struct tap_filter { #define TUN_FLOW_EXPIRE (3 * HZ) +struct tun_pcpu_stats { + u64 rx_packets; + u64 rx_bytes; + u64 tx_packets; + u64 tx_bytes; + struct u64_stats_sync syncp; + u32 rx_dropped; + u32 tx_dropped; + u32 rx_frame_errors; +}; + /* A tun_file connects an open character device to a tuntap netdevice. It * also contains all socket related structures (except sock_fprog and tap_filter) * to serve as one transmit queue for tuntap device. The sock_fprog and @@ -205,6 +216,7 @@ struct tun_struct { struct list_head disabled; void *security; u32 flow_count; + struct tun_pcpu_stats __percpu *pcpu_stats; }; #ifdef CONFIG_TUN_VNET_CROSS_LE @@ -568,11 +580,13 @@ static void tun_detach_all(struct net_device *dev) for (i = 0; i < n; i++) { tfile = rtnl_dereference(tun->tfiles[i]); BUG_ON(!tfile); + tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; tfile->socket.sk->sk_data_ready(tfile->socket.sk); RCU_INIT_POINTER(tfile->tun, NULL); --tun->numqueues; } list_for_each_entry(tfile, &tun->disabled, next) { + tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; tfile->socket.sk->sk_data_ready(tfile->socket.sk); RCU_INIT_POINTER(tfile->tun, NULL); } @@ -629,6 +643,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filte goto out; } tfile->queue_index = tun->numqueues; + tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; rcu_assign_pointer(tfile->tun, tun); rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); tun->numqueues++; @@ -821,7 +836,8 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) if (txq >= numqueues) goto drop; - if (numqueues == 1) { +#ifdef CONFIG_RPS + if (numqueues == 1 && static_key_false(&rps_needed)) { /* Select queue was not called for the skbuff, so we extract the * RPS hash and save it into the flow_table here. */ @@ -836,6 +852,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) tun_flow_save_rps_rxhash(e, rxhash); } } +#endif tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); @@ -886,7 +903,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) return NETDEV_TX_OK; drop: - dev->stats.tx_dropped++; + this_cpu_inc(tun->pcpu_stats->tx_dropped); skb_tx_error(skb); kfree_skb(skb); rcu_read_unlock(); @@ -949,6 +966,43 @@ static void tun_set_headroom(struct net_device *dev, int new_hr) tun->align = new_hr; } +static struct rtnl_link_stats64 * +tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) +{ + u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; + struct tun_struct *tun = netdev_priv(dev); + struct tun_pcpu_stats *p; + int i; + + for_each_possible_cpu(i) { + u64 rxpackets, rxbytes, txpackets, txbytes; + unsigned int start; + + p = per_cpu_ptr(tun->pcpu_stats, i); + do { + start = u64_stats_fetch_begin(&p->syncp); + rxpackets = p->rx_packets; + rxbytes = p->rx_bytes; + txpackets = p->tx_packets; + txbytes = p->tx_bytes; + } while (u64_stats_fetch_retry(&p->syncp, start)); + + stats->rx_packets += rxpackets; + stats->rx_bytes += rxbytes; + stats->tx_packets += txpackets; + stats->tx_bytes += txbytes; + + /* u32 counters */ + rx_dropped += p->rx_dropped; + rx_frame_errors += p->rx_frame_errors; + tx_dropped += p->tx_dropped; + } + stats->rx_dropped = rx_dropped; + stats->rx_frame_errors = rx_frame_errors; + stats->tx_dropped = tx_dropped; + return stats; +} + static const struct net_device_ops tun_netdev_ops = { .ndo_uninit = tun_net_uninit, .ndo_open = tun_net_open, @@ -961,6 +1015,7 @@ static const struct net_device_ops tun_netdev_ops = { .ndo_poll_controller = tun_poll_controller, #endif .ndo_set_rx_headroom = tun_set_headroom, + .ndo_get_stats64 = tun_net_get_stats64, }; static const struct net_device_ops tap_netdev_ops = { @@ -979,6 +1034,7 @@ static const struct net_device_ops tap_netdev_ops = { #endif .ndo_features_check = passthru_features_check, .ndo_set_rx_headroom = tun_set_headroom, + .ndo_get_stats64 = tun_net_get_stats64, }; static void tun_flow_init(struct tun_struct *tun) @@ -1103,6 +1159,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, size_t total_len = iov_iter_count(from); size_t len = total_len, align = tun->align, linear; struct virtio_net_hdr gso = { 0 }; + struct tun_pcpu_stats *stats; int good_linear; int copylen; bool zerocopy = false; @@ -1177,7 +1234,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); if (IS_ERR(skb)) { if (PTR_ERR(skb) != -EAGAIN) - tun->dev->stats.rx_dropped++; + this_cpu_inc(tun->pcpu_stats->rx_dropped); return PTR_ERR(skb); } @@ -1192,18 +1249,16 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, } if (err) { - tun->dev->stats.rx_dropped++; + this_cpu_inc(tun->pcpu_stats->rx_dropped); kfree_skb(skb); return -EFAULT; } - if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { - if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start), - tun16_to_cpu(tun, gso.csum_offset))) { - tun->dev->stats.rx_frame_errors++; - kfree_skb(skb); - return -EINVAL; - } + err = virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun)); + if (err) { + this_cpu_inc(tun->pcpu_stats->rx_frame_errors); + kfree_skb(skb); + return -EINVAL; } switch (tun->flags & TUN_TYPE_MASK) { @@ -1217,7 +1272,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, pi.proto = htons(ETH_P_IPV6); break; default: - tun->dev->stats.rx_dropped++; + this_cpu_inc(tun->pcpu_stats->rx_dropped); kfree_skb(skb); return -EINVAL; } @@ -1232,39 +1287,6 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, break; } - if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { - pr_debug("GSO!\n"); - switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { - case VIRTIO_NET_HDR_GSO_TCPV4: - skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; - break; - case VIRTIO_NET_HDR_GSO_TCPV6: - skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; - break; - case VIRTIO_NET_HDR_GSO_UDP: - skb_shinfo(skb)->gso_type = SKB_GSO_UDP; - break; - default: - tun->dev->stats.rx_frame_errors++; - kfree_skb(skb); - return -EINVAL; - } - - if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) - skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; - - skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size); - if (skb_shinfo(skb)->gso_size == 0) { - tun->dev->stats.rx_frame_errors++; - kfree_skb(skb); - return -EINVAL; - } - - /* Header must be checked, and gso_segs computed. */ - skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; - skb_shinfo(skb)->gso_segs = 0; - } - /* copy skb_ubuf_info for callback when skb has no error */ if (zerocopy) { skb_shinfo(skb)->destructor_arg = msg_control; @@ -1278,8 +1300,12 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, rxhash = skb_get_hash(skb); netif_rx_ni(skb); - tun->dev->stats.rx_packets++; - tun->dev->stats.rx_bytes += len; + stats = get_cpu_ptr(tun->pcpu_stats); + u64_stats_update_begin(&stats->syncp); + stats->rx_packets++; + stats->rx_bytes += len; + u64_stats_update_end(&stats->syncp); + put_cpu_ptr(stats); tun_flow_update(tun, rxhash, tfile); return total_len; @@ -1308,6 +1334,7 @@ static ssize_t tun_put_user(struct tun_struct *tun, struct iov_iter *iter) { struct tun_pi pi = { 0, skb->protocol }; + struct tun_pcpu_stats *stats; ssize_t total; int vlan_offset = 0; int vlan_hlen = 0; @@ -1337,46 +1364,26 @@ static ssize_t tun_put_user(struct tun_struct *tun, if (vnet_hdr_sz) { struct virtio_net_hdr gso = { 0 }; /* no info leak */ + int ret; + if (iov_iter_count(iter) < vnet_hdr_sz) return -EINVAL; - if (skb_is_gso(skb)) { + ret = virtio_net_hdr_from_skb(skb, &gso, + tun_is_little_endian(tun)); + if (ret) { struct skb_shared_info *sinfo = skb_shinfo(skb); - - /* This is a hint as to how much should be linear. */ - gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb)); - gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size); - if (sinfo->gso_type & SKB_GSO_TCPV4) - gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; - else if (sinfo->gso_type & SKB_GSO_TCPV6) - gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; - else if (sinfo->gso_type & SKB_GSO_UDP) - gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; - else { - pr_err("unexpected GSO type: " - "0x%x, gso_size %d, hdr_len %d\n", - sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), - tun16_to_cpu(tun, gso.hdr_len)); - print_hex_dump(KERN_ERR, "tun: ", - DUMP_PREFIX_NONE, - 16, 1, skb->head, - min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); - WARN_ON_ONCE(1); - return -EINVAL; - } - if (sinfo->gso_type & SKB_GSO_TCP_ECN) - gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; - } else - gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; - - if (skb->ip_summed == CHECKSUM_PARTIAL) { - gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; - gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb) + - vlan_hlen); - gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset); - } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { - gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; - } /* else everything is zero */ + pr_err("unexpected GSO type: " + "0x%x, gso_size %d, hdr_len %d\n", + sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), + tun16_to_cpu(tun, gso.hdr_len)); + print_hex_dump(KERN_ERR, "tun: ", + DUMP_PREFIX_NONE, + 16, 1, skb->head, + min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); + WARN_ON_ONCE(1); + return -EINVAL; + } if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) return -EFAULT; @@ -1408,8 +1415,13 @@ static ssize_t tun_put_user(struct tun_struct *tun, skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); done: - tun->dev->stats.tx_packets++; - tun->dev->stats.tx_bytes += skb->len + vlan_hlen; + /* caller is in process context, */ + stats = get_cpu_ptr(tun->pcpu_stats); + u64_stats_update_begin(&stats->syncp); + stats->tx_packets++; + stats->tx_bytes += skb->len + vlan_hlen; + u64_stats_update_end(&stats->syncp); + put_cpu_ptr(tun->pcpu_stats); return total; } @@ -1427,9 +1439,6 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, if (!iov_iter_count(to)) return 0; - if (tun->dev->reg_state != NETREG_REGISTERED) - return -EIO; - /* Read frames from queue */ skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0, &peeked, &off, &err); @@ -1467,6 +1476,7 @@ static void tun_free_netdev(struct net_device *dev) struct tun_struct *tun = netdev_priv(dev); BUG_ON(!(list_empty(&tun->disabled))); + free_percpu(tun->pcpu_stats); tun_flow_uninit(tun); security_tun_dev_free_security(tun->security); free_netdev(dev); @@ -1715,11 +1725,17 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) tun->filter_attached = false; tun->sndbuf = tfile->socket.sk->sk_sndbuf; + tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); + if (!tun->pcpu_stats) { + err = -ENOMEM; + goto err_free_dev; + } + spin_lock_init(&tun->lock); err = security_tun_dev_alloc_security(&tun->security); if (err < 0) - goto err_free_dev; + goto err_free_stat; tun_net_init(dev); tun_flow_init(tun); @@ -1727,7 +1743,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; - dev->features = dev->hw_features; + dev->features = dev->hw_features | NETIF_F_LLTX; dev->vlan_features = dev->features & ~(NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX); @@ -1763,6 +1779,8 @@ err_detach: err_free_flow: tun_flow_uninit(tun); security_tun_dev_free_security(tun->security); +err_free_stat: + free_percpu(tun->pcpu_stats); err_free_dev: free_netdev(dev); return err; |