![Lance Richardson](/assets/img/avatar_default.png)
Eliminate endianness mismatch warnings (reported by sparse) in this file by using appropriate nla_put_*()/nla_get_*() calls. Signed-off-by: Lance Richardson <lrichard@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
427 lines
12 KiB
C
427 lines
12 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/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 <linux/static_key.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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#include <net/dst_metadata.h>
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void iptunnel_xmit(struct sock *sk, 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 - skb_inner_network_offset(skb);
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struct net *net = dev_net(rt->dst.dev);
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struct net_device *dev = skb->dev;
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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(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
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err = ip_local_out(net, sk, skb);
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if (unlikely(net_xmit_eval(err)))
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pkt_len = 0;
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iptunnel_xmit_stats(dev, 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;
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if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
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return -ENOMEM;
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eh = (struct ethhdr *)skb->data;
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if (likely(eth_proto_is_802_3(eh->h_proto)))
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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 metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
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gfp_t flags)
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{
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struct metadata_dst *res;
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struct ip_tunnel_info *dst, *src;
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if (!md || md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
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return NULL;
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res = metadata_dst_alloc(0, flags);
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if (!res)
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return NULL;
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dst = &res->u.tun_info;
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src = &md->u.tun_info;
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dst->key.tun_id = src->key.tun_id;
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if (src->mode & IP_TUNNEL_INFO_IPV6)
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memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
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sizeof(struct in6_addr));
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else
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dst->key.u.ipv4.dst = src->key.u.ipv4.src;
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dst->mode = src->mode | IP_TUNNEL_INFO_TX;
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return res;
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}
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EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
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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 packet is not gso and we are resolving any partial checksum,
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* clear encapsulation flag. This allows setting CHECKSUM_PARTIAL
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* on the outer header without confusing devices that implement
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* NETIF_F_IP_CSUM with encapsulation.
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*/
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if (csum_help)
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skb->encapsulation = 0;
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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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/* Often modified stats are per cpu, other are shared (netdev->stats) */
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struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot)
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{
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int i;
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netdev_stats_to_stats64(tot, &dev->stats);
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for_each_possible_cpu(i) {
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const struct pcpu_sw_netstats *tstats =
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per_cpu_ptr(dev->tstats, i);
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u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
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unsigned int start;
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do {
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start = u64_stats_fetch_begin_irq(&tstats->syncp);
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rx_packets = tstats->rx_packets;
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tx_packets = tstats->tx_packets;
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rx_bytes = tstats->rx_bytes;
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tx_bytes = tstats->tx_bytes;
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} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
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tot->rx_packets += rx_packets;
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tot->tx_packets += tx_packets;
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tot->rx_bytes += rx_bytes;
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tot->tx_bytes += tx_bytes;
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}
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return tot;
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}
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EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
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static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
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[LWTUNNEL_IP_ID] = { .type = NLA_U64 },
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[LWTUNNEL_IP_DST] = { .type = NLA_U32 },
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[LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
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[LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
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[LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
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[LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
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};
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static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr,
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unsigned int family, const void *cfg,
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struct lwtunnel_state **ts)
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{
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struct ip_tunnel_info *tun_info;
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struct lwtunnel_state *new_state;
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struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
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int err;
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err = nla_parse_nested(tb, LWTUNNEL_IP_MAX, attr, ip_tun_policy);
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if (err < 0)
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return err;
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new_state = lwtunnel_state_alloc(sizeof(*tun_info));
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if (!new_state)
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return -ENOMEM;
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new_state->type = LWTUNNEL_ENCAP_IP;
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tun_info = lwt_tun_info(new_state);
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if (tb[LWTUNNEL_IP_ID])
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tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
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if (tb[LWTUNNEL_IP_DST])
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tun_info->key.u.ipv4.dst = nla_get_be32(tb[LWTUNNEL_IP_DST]);
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if (tb[LWTUNNEL_IP_SRC])
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tun_info->key.u.ipv4.src = nla_get_be32(tb[LWTUNNEL_IP_SRC]);
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if (tb[LWTUNNEL_IP_TTL])
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tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
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if (tb[LWTUNNEL_IP_TOS])
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tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
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if (tb[LWTUNNEL_IP_FLAGS])
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tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
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tun_info->mode = IP_TUNNEL_INFO_TX;
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tun_info->options_len = 0;
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*ts = new_state;
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return 0;
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}
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static int ip_tun_fill_encap_info(struct sk_buff *skb,
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struct lwtunnel_state *lwtstate)
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{
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struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
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if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id) ||
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nla_put_be32(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
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nla_put_be32(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
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nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
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nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
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nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags))
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return -ENOMEM;
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return 0;
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}
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static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
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{
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return nla_total_size(8) /* LWTUNNEL_IP_ID */
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+ nla_total_size(4) /* LWTUNNEL_IP_DST */
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+ nla_total_size(4) /* LWTUNNEL_IP_SRC */
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+ nla_total_size(1) /* LWTUNNEL_IP_TOS */
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+ nla_total_size(1) /* LWTUNNEL_IP_TTL */
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+ nla_total_size(2); /* LWTUNNEL_IP_FLAGS */
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}
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static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
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{
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return memcmp(lwt_tun_info(a), lwt_tun_info(b),
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sizeof(struct ip_tunnel_info));
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}
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static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
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.build_state = ip_tun_build_state,
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.fill_encap = ip_tun_fill_encap_info,
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.get_encap_size = ip_tun_encap_nlsize,
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.cmp_encap = ip_tun_cmp_encap,
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};
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static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
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[LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
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[LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
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[LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
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[LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
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[LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
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[LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
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};
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static int ip6_tun_build_state(struct net_device *dev, struct nlattr *attr,
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unsigned int family, const void *cfg,
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struct lwtunnel_state **ts)
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{
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struct ip_tunnel_info *tun_info;
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struct lwtunnel_state *new_state;
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struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
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int err;
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err = nla_parse_nested(tb, LWTUNNEL_IP6_MAX, attr, ip6_tun_policy);
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if (err < 0)
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return err;
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new_state = lwtunnel_state_alloc(sizeof(*tun_info));
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if (!new_state)
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return -ENOMEM;
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new_state->type = LWTUNNEL_ENCAP_IP6;
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tun_info = lwt_tun_info(new_state);
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if (tb[LWTUNNEL_IP6_ID])
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tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
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if (tb[LWTUNNEL_IP6_DST])
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tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
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if (tb[LWTUNNEL_IP6_SRC])
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tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
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if (tb[LWTUNNEL_IP6_HOPLIMIT])
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tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
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if (tb[LWTUNNEL_IP6_TC])
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tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
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if (tb[LWTUNNEL_IP6_FLAGS])
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tun_info->key.tun_flags = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
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tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
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tun_info->options_len = 0;
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*ts = new_state;
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return 0;
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}
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static int ip6_tun_fill_encap_info(struct sk_buff *skb,
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struct lwtunnel_state *lwtstate)
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{
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struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
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if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id) ||
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nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
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nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
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nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.tos) ||
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nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.ttl) ||
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nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags))
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return -ENOMEM;
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return 0;
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}
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static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
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{
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return nla_total_size(8) /* LWTUNNEL_IP6_ID */
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+ nla_total_size(16) /* LWTUNNEL_IP6_DST */
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+ nla_total_size(16) /* LWTUNNEL_IP6_SRC */
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+ nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
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+ nla_total_size(1) /* LWTUNNEL_IP6_TC */
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+ nla_total_size(2); /* LWTUNNEL_IP6_FLAGS */
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}
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static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
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.build_state = ip6_tun_build_state,
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.fill_encap = ip6_tun_fill_encap_info,
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.get_encap_size = ip6_tun_encap_nlsize,
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.cmp_encap = ip_tun_cmp_encap,
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};
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void __init ip_tunnel_core_init(void)
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{
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lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
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lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
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}
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struct static_key ip_tunnel_metadata_cnt = STATIC_KEY_INIT_FALSE;
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EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
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void ip_tunnel_need_metadata(void)
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{
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static_key_slow_inc(&ip_tunnel_metadata_cnt);
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}
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EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
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void ip_tunnel_unneed_metadata(void)
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{
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static_key_slow_dec(&ip_tunnel_metadata_cnt);
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}
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EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
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