ip_tunnel_core.c revision 7539fadcb8146a5f0db51e80d99c9e724efec7b0
10e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar/* 20e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * Copyright (c) 2013 Nicira, Inc. 30e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * 40e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * This program is free software; you can redistribute it and/or 50e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * modify it under the terms of version 2 of the GNU General Public 60e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * License as published by the Free Software Foundation. 70e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * 80e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * This program is distributed in the hope that it will be useful, but 90e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * WITHOUT ANY WARRANTY; without even the implied warranty of 100e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 110e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * General Public License for more details. 120e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * 130e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * You should have received a copy of the GNU General Public License 140e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * along with this program; if not, write to the Free Software 150e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 160e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar * 02110-1301, USA 170e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar */ 180e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 190e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 200e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 210e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/types.h> 220e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/kernel.h> 230e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/skbuff.h> 240e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/netdevice.h> 250e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/in.h> 260e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/if_arp.h> 270e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/mroute.h> 280e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/init.h> 290e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/in6.h> 300e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/inetdevice.h> 310e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/netfilter_ipv4.h> 320e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/etherdevice.h> 330e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/if_ether.h> 340e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <linux/if_vlan.h> 350e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 360e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/ip.h> 370e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/icmp.h> 380e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/protocol.h> 390e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/ip_tunnels.h> 400e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/arp.h> 410e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/checksum.h> 420e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/dsfield.h> 430e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/inet_ecn.h> 440e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/xfrm.h> 450e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/net_namespace.h> 460e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/netns/generic.h> 470e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar#include <net/rtnetlink.h> 480e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 498b7ed2d91d6afb0b55ba75f94b66e51f70783a46Nicolas Dichtelint iptunnel_xmit(struct rtable *rt, struct sk_buff *skb, 500e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar __be32 src, __be32 dst, __u8 proto, 51963a88b31ddbbe99f38502239b1a46601773d217Nicolas Dichtel __u8 tos, __u8 ttl, __be16 df, bool xnet) 520e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar{ 530e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar int pkt_len = skb->len; 540e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar struct iphdr *iph; 550e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar int err; 560e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 57963a88b31ddbbe99f38502239b1a46601773d217Nicolas Dichtel skb_scrub_packet(skb, xnet); 58963a88b31ddbbe99f38502239b1a46601773d217Nicolas Dichtel 597539fadcb8146a5f0db51e80d99c9e724efec7b0Tom Herbert skb_clear_hash(skb); 600e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar skb_dst_set(skb, &rt->dst); 610e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 620e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 630e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar /* Push down and install the IP header. */ 6478a3694d44a029242dd0830b34ab20ef1704be35Steffen Klassert skb_push(skb, sizeof(struct iphdr)); 650e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar skb_reset_network_header(skb); 660e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 670e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph = ip_hdr(skb); 680e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 690e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->version = 4; 700e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->ihl = sizeof(struct iphdr) >> 2; 710e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->frag_off = df; 720e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->protocol = proto; 730e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->tos = tos; 740e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->daddr = dst; 750e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->saddr = src; 760e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar iph->ttl = ttl; 774221f40513233fa8edeef7fc82e44163fde03b9bPravin B Shelar __ip_select_ident(iph, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 1); 780e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar 790e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar err = ip_local_out(skb); 800e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar if (unlikely(net_xmit_eval(err))) 810e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar pkt_len = 0; 820e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar return pkt_len; 830e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B Shelar} 840e6fbc5b6c6218987c93b8c7ca60cf786062899dPravin B ShelarEXPORT_SYMBOL_GPL(iptunnel_xmit); 853d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar 863d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelarint iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto) 873d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar{ 883d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar if (unlikely(!pskb_may_pull(skb, hdr_len))) 893d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar return -ENOMEM; 903d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar 913d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb_pull_rcsum(skb, hdr_len); 923d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar 933d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar if (inner_proto == htons(ETH_P_TEB)) { 943d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar struct ethhdr *eh = (struct ethhdr *)skb->data; 953d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar 963d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 973d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar return -ENOMEM; 983d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar 993d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN)) 1003d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb->protocol = eh->h_proto; 1013d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar else 1023d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb->protocol = htons(ETH_P_802_2); 1033d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar 1043d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar } else { 1053d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb->protocol = inner_proto; 1063d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar } 1073d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar 1083d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar nf_reset(skb); 1093d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar secpath_reset(skb); 1107539fadcb8146a5f0db51e80d99c9e724efec7b0Tom Herbert skb_clear_hash_if_not_l4(skb); 1113d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb_dst_drop(skb); 1123d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb->vlan_tci = 0; 1133d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb_set_queue_mapping(skb, 0); 1143d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar skb->pkt_type = PACKET_HOST; 1153d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar return 0; 1163d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B Shelar} 1173d7b46cd20e300bd6989fb1f43d46f1b9645816ePravin B ShelarEXPORT_SYMBOL_GPL(iptunnel_pull_header); 1182d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet 1192d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazetstruct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, 1202d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet bool csum_help, 1212d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet int gso_type_mask) 1222d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet{ 1232d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet int err; 1242d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet 1252d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet if (likely(!skb->encapsulation)) { 1262d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet skb_reset_inner_headers(skb); 1272d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet skb->encapsulation = 1; 1282d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet } 1292d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet 1302d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet if (skb_is_gso(skb)) { 1312d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet err = skb_unclone(skb, GFP_ATOMIC); 1322d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet if (unlikely(err)) 1332d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet goto error; 1342d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet skb_shinfo(skb)->gso_type |= gso_type_mask; 1352d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet return skb; 1362d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet } 1372d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet 1382d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) { 1392d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet err = skb_checksum_help(skb); 1402d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet if (unlikely(err)) 1412d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet goto error; 1422d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet } else if (skb->ip_summed != CHECKSUM_PARTIAL) 1432d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet skb->ip_summed = CHECKSUM_NONE; 1442d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet 1452d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet return skb; 1462d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazeterror: 1472d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet kfree_skb(skb); 1482d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet return ERR_PTR(err); 1492d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric Dumazet} 1502d26f0a3c0e22f6b3096a2503d086e4b5e99d708Eric DumazetEXPORT_SYMBOL_GPL(iptunnel_handle_offloads); 151