mirror of https://gitee.com/openkylin/linux.git
151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
/*
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* Copyright (c) 2013 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/if_arp.h>
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#include <linux/mroute.h>
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#include <linux/init.h>
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#include <linux/in6.h>
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#include <linux/inetdevice.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/protocol.h>
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#include <net/ip_tunnels.h>
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#include <net/arp.h>
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#include <net/checksum.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/rtnetlink.h>
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int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb,
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__be32 src, __be32 dst, __u8 proto,
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__u8 tos, __u8 ttl, __be16 df, bool xnet)
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{
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int pkt_len = skb->len;
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struct iphdr *iph;
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int err;
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skb_scrub_packet(skb, xnet);
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skb_clear_hash(skb);
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skb_dst_set(skb, &rt->dst);
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memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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/* Push down and install the IP header. */
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skb_push(skb, sizeof(struct iphdr));
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skb_reset_network_header(skb);
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iph = ip_hdr(skb);
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iph->version = 4;
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iph->ihl = sizeof(struct iphdr) >> 2;
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iph->frag_off = df;
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iph->protocol = proto;
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iph->tos = tos;
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iph->daddr = dst;
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iph->saddr = src;
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iph->ttl = ttl;
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__ip_select_ident(iph, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 1);
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err = ip_local_out(skb);
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if (unlikely(net_xmit_eval(err)))
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pkt_len = 0;
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return pkt_len;
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}
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EXPORT_SYMBOL_GPL(iptunnel_xmit);
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int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
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{
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if (unlikely(!pskb_may_pull(skb, hdr_len)))
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return -ENOMEM;
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skb_pull_rcsum(skb, hdr_len);
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if (inner_proto == htons(ETH_P_TEB)) {
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struct ethhdr *eh = (struct ethhdr *)skb->data;
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if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
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return -ENOMEM;
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if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN))
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skb->protocol = eh->h_proto;
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else
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skb->protocol = htons(ETH_P_802_2);
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} else {
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skb->protocol = inner_proto;
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}
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nf_reset(skb);
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secpath_reset(skb);
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skb_clear_hash_if_not_l4(skb);
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skb_dst_drop(skb);
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skb->vlan_tci = 0;
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skb_set_queue_mapping(skb, 0);
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skb->pkt_type = PACKET_HOST;
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return 0;
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}
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EXPORT_SYMBOL_GPL(iptunnel_pull_header);
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struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb,
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bool csum_help,
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int gso_type_mask)
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{
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int err;
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if (likely(!skb->encapsulation)) {
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skb_reset_inner_headers(skb);
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skb->encapsulation = 1;
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}
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if (skb_is_gso(skb)) {
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err = skb_unclone(skb, GFP_ATOMIC);
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if (unlikely(err))
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goto error;
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skb_shinfo(skb)->gso_type |= gso_type_mask;
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return skb;
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}
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if (skb->ip_summed == CHECKSUM_PARTIAL && csum_help) {
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err = skb_checksum_help(skb);
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if (unlikely(err))
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goto error;
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} else if (skb->ip_summed != CHECKSUM_PARTIAL)
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skb->ip_summed = CHECKSUM_NONE;
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return skb;
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error:
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kfree_skb(skb);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
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