Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 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 | |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 49 | int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 50 | __be32 src, __be32 dst, __u8 proto, |
Nicolas Dichtel | 963a88b | 2013-09-02 15:34:57 +0200 | [diff] [blame] | 51 | __u8 tos, __u8 ttl, __be16 df, bool xnet) |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 52 | { |
| 53 | int pkt_len = skb->len; |
| 54 | struct iphdr *iph; |
| 55 | int err; |
| 56 | |
Nicolas Dichtel | 963a88b | 2013-09-02 15:34:57 +0200 | [diff] [blame] | 57 | skb_scrub_packet(skb, xnet); |
| 58 | |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 59 | skb_clear_hash(skb); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 60 | skb_dst_set(skb, &rt->dst); |
| 61 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| 62 | |
| 63 | /* Push down and install the IP header. */ |
Steffen Klassert | 78a3694 | 2013-10-01 11:35:51 +0200 | [diff] [blame] | 64 | skb_push(skb, sizeof(struct iphdr)); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 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; |
Hannes Frederic Sowa | 926a882 | 2015-04-08 17:01:22 +0200 | [diff] [blame] | 77 | __ip_select_ident(dev_net(rt->dst.dev), iph, |
| 78 | skb_shinfo(skb)->gso_segs ?: 1); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 79 | |
Eric Dumazet | aad8872 | 2014-04-15 13:47:15 -0400 | [diff] [blame] | 80 | err = ip_local_out_sk(sk, skb); |
Pravin B Shelar | 0e6fbc5 | 2013-06-17 17:49:56 -0700 | [diff] [blame] | 81 | if (unlikely(net_xmit_eval(err))) |
| 82 | pkt_len = 0; |
| 83 | return pkt_len; |
| 84 | } |
| 85 | EXPORT_SYMBOL_GPL(iptunnel_xmit); |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 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)) { |
Li RongQing | 1245dfc | 2014-10-17 16:53:23 +0800 | [diff] [blame] | 95 | struct ethhdr *eh; |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 96 | |
| 97 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) |
| 98 | return -ENOMEM; |
| 99 | |
Li RongQing | 1245dfc | 2014-10-17 16:53:23 +0800 | [diff] [blame] | 100 | eh = (struct ethhdr *)skb->data; |
Alexander Duyck | d181ddc | 2015-05-04 14:33:59 -0700 | [diff] [blame] | 101 | if (likely(eth_proto_is_802_3(eh->h_proto))) |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 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); |
Tom Herbert | 7539fad | 2013-12-15 22:12:18 -0800 | [diff] [blame] | 112 | skb_clear_hash_if_not_l4(skb); |
Pravin B Shelar | fbd02dd | 2014-03-23 22:06:36 -0700 | [diff] [blame] | 113 | skb_dst_drop(skb); |
Pravin B Shelar | 3d7b46c | 2013-06-17 17:50:02 -0700 | [diff] [blame] | 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); |
Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 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 | |
Tom Herbert | 7e2b10c | 2014-06-04 17:20:02 -0700 | [diff] [blame] | 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 | |
Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 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); |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 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 | |
Alexander Duyck | c24a596 | 2015-05-14 14:31:28 -0700 | [diff] [blame] | 168 | netdev_stats_to_stats64(tot, &dev->stats); |
| 169 | |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 170 | for_each_possible_cpu(i) { |
| 171 | const struct pcpu_sw_netstats *tstats = |
| 172 | per_cpu_ptr(dev->tstats, i); |
| 173 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
| 174 | unsigned int start; |
| 175 | |
| 176 | do { |
Eric W. Biederman | 57a7744 | 2014-03-13 21:26:42 -0700 | [diff] [blame] | 177 | start = u64_stats_fetch_begin_irq(&tstats->syncp); |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 178 | rx_packets = tstats->rx_packets; |
| 179 | tx_packets = tstats->tx_packets; |
| 180 | rx_bytes = tstats->rx_bytes; |
| 181 | tx_bytes = tstats->tx_bytes; |
Eric W. Biederman | 57a7744 | 2014-03-13 21:26:42 -0700 | [diff] [blame] | 182 | } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 183 | |
| 184 | tot->rx_packets += rx_packets; |
| 185 | tot->tx_packets += tx_packets; |
| 186 | tot->rx_bytes += rx_bytes; |
| 187 | tot->tx_bytes += tx_bytes; |
| 188 | } |
| 189 | |
David S. Miller | ebe44f3 | 2014-02-20 02:14:23 -0500 | [diff] [blame] | 190 | return tot; |
| 191 | } |
| 192 | EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); |