1 /* 2 * Copyright (c) 2013 Nicira, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 16 * 02110-1301, USA 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/types.h> 22 #include <linux/kernel.h> 23 #include <linux/skbuff.h> 24 #include <linux/netdevice.h> 25 #include <linux/in.h> 26 #include <linux/if_arp.h> 27 #include <linux/mroute.h> 28 #include <linux/init.h> 29 #include <linux/in6.h> 30 #include <linux/inetdevice.h> 31 #include <linux/netfilter_ipv4.h> 32 #include <linux/etherdevice.h> 33 #include <linux/if_ether.h> 34 #include <linux/if_vlan.h> 35 36 #include <net/ip.h> 37 #include <net/icmp.h> 38 #include <net/protocol.h> 39 #include <net/ip_tunnels.h> 40 #include <net/arp.h> 41 #include <net/checksum.h> 42 #include <net/dsfield.h> 43 #include <net/inet_ecn.h> 44 #include <net/xfrm.h> 45 #include <net/net_namespace.h> 46 #include <net/netns/generic.h> 47 #include <net/rtnetlink.h> 48 49 int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 50 __be32 src, __be32 dst, __u8 proto, 51 __u8 tos, __u8 ttl, __be16 df, bool xnet) 52 { 53 int pkt_len = skb->len; 54 struct iphdr *iph; 55 int err; 56 57 skb_scrub_packet(skb, xnet); 58 59 skb_clear_hash(skb); 60 skb_dst_set(skb, &rt->dst); 61 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 62 63 /* Push down and install the IP header. */ 64 skb_push(skb, sizeof(struct iphdr)); 65 skb_reset_network_header(skb); 66 67 iph = ip_hdr(skb); 68 69 iph->version = 4; 70 iph->ihl = sizeof(struct iphdr) >> 2; 71 iph->frag_off = df; 72 iph->protocol = proto; 73 iph->tos = tos; 74 iph->daddr = dst; 75 iph->saddr = src; 76 iph->ttl = ttl; 77 __ip_select_ident(dev_net(rt->dst.dev), iph, 78 skb_shinfo(skb)->gso_segs ?: 1); 79 80 err = ip_local_out_sk(sk, skb); 81 if (unlikely(net_xmit_eval(err))) 82 pkt_len = 0; 83 return pkt_len; 84 } 85 EXPORT_SYMBOL_GPL(iptunnel_xmit); 86 87 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto) 88 { 89 if (unlikely(!pskb_may_pull(skb, hdr_len))) 90 return -ENOMEM; 91 92 skb_pull_rcsum(skb, hdr_len); 93 94 if (inner_proto == htons(ETH_P_TEB)) { 95 struct ethhdr *eh; 96 97 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 98 return -ENOMEM; 99 100 eh = (struct ethhdr *)skb->data; 101 if (likely(eth_proto_is_802_3(eh->h_proto))) 102 skb->protocol = eh->h_proto; 103 else 104 skb->protocol = htons(ETH_P_802_2); 105 106 } else { 107 skb->protocol = inner_proto; 108 } 109 110 nf_reset(skb); 111 secpath_reset(skb); 112 skb_clear_hash_if_not_l4(skb); 113 skb_dst_drop(skb); 114 skb->vlan_tci = 0; 115 skb_set_queue_mapping(skb, 0); 116 skb->pkt_type = PACKET_HOST; 117 return 0; 118 } 119 EXPORT_SYMBOL_GPL(iptunnel_pull_header); 120 121 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, 122 bool csum_help, 123 int gso_type_mask) 124 { 125 int err; 126 127 if (likely(!skb->encapsulation)) { 128 skb_reset_inner_headers(skb); 129 skb->encapsulation = 1; 130 } 131 132 if (skb_is_gso(skb)) { 133 err = skb_unclone(skb, GFP_ATOMIC); 134 if (unlikely(err)) 135 goto error; 136 skb_shinfo(skb)->gso_type |= gso_type_mask; 137 return skb; 138 } 139 140 /* If packet is not gso and we are resolving any partial checksum, 141 * clear encapsulation flag. This allows setting CHECKSUM_PARTIAL 142 * on the outer header without confusing devices that implement 143 * NETIF_F_IP_CSUM with encapsulation. 144 */ 145 if (csum_help) 146 skb->encapsulation = 0; 147 148 if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) { 149 err = skb_checksum_help(skb); 150 if (unlikely(err)) 151 goto error; 152 } else if (skb->ip_summed != CHECKSUM_PARTIAL) 153 skb->ip_summed = CHECKSUM_NONE; 154 155 return skb; 156 error: 157 kfree_skb(skb); 158 return ERR_PTR(err); 159 } 160 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); 161 162 /* Often modified stats are per cpu, other are shared (netdev->stats) */ 163 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, 164 struct rtnl_link_stats64 *tot) 165 { 166 int i; 167 168 for_each_possible_cpu(i) { 169 const struct pcpu_sw_netstats *tstats = 170 per_cpu_ptr(dev->tstats, i); 171 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 172 unsigned int start; 173 174 do { 175 start = u64_stats_fetch_begin_irq(&tstats->syncp); 176 rx_packets = tstats->rx_packets; 177 tx_packets = tstats->tx_packets; 178 rx_bytes = tstats->rx_bytes; 179 tx_bytes = tstats->tx_bytes; 180 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 181 182 tot->rx_packets += rx_packets; 183 tot->tx_packets += tx_packets; 184 tot->rx_bytes += rx_bytes; 185 tot->tx_bytes += tx_bytes; 186 } 187 188 tot->multicast = dev->stats.multicast; 189 190 tot->rx_crc_errors = dev->stats.rx_crc_errors; 191 tot->rx_fifo_errors = dev->stats.rx_fifo_errors; 192 tot->rx_length_errors = dev->stats.rx_length_errors; 193 tot->rx_frame_errors = dev->stats.rx_frame_errors; 194 tot->rx_errors = dev->stats.rx_errors; 195 196 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 197 tot->tx_carrier_errors = dev->stats.tx_carrier_errors; 198 tot->tx_dropped = dev->stats.tx_dropped; 199 tot->tx_aborted_errors = dev->stats.tx_aborted_errors; 200 tot->tx_errors = dev->stats.tx_errors; 201 202 tot->collisions = dev->stats.collisions; 203 204 return tot; 205 } 206 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); 207