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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Julian Wiedmann](/assets/img/avatar_default.png)
sparse complains about some harmless endianness issues: > net/ipv4/ip_tunnel_core.c:225:43: warning: cast to restricted __be16 > net/ipv4/ip_tunnel_core.c:225:43: warning: incorrect type in initializer (different base types) > net/ipv4/ip_tunnel_core.c:225:43: expected restricted __be16 [usertype] mtu > net/ipv4/ip_tunnel_core.c:225:43: got unsigned short [usertype] iptunnel_pmtud_build_icmp() uses the wrong flavour of byte-order conversion when storing the MTU into the ICMPv4 packet. Use htons(), just like iptunnel_pmtud_build_icmpv6() does. > net/ipv4/ip_tunnel_core.c:248:35: warning: cast from restricted __be16 > net/ipv4/ip_tunnel_core.c:248:35: warning: incorrect type in argument 3 (different base types) > net/ipv4/ip_tunnel_core.c:248:35: expected unsigned short type > net/ipv4/ip_tunnel_core.c:248:35: got restricted __be16 [usertype] > net/ipv4/ip_tunnel_core.c:341:35: warning: cast from restricted __be16 > net/ipv4/ip_tunnel_core.c:341:35: warning: incorrect type in argument 3 (different base types) > net/ipv4/ip_tunnel_core.c:341:35: expected unsigned short type > net/ipv4/ip_tunnel_core.c:341:35: got restricted __be16 [usertype] eth_header() wants the Ethertype in host-order, use the correct flavour of byte-order conversion. > net/ipv4/ip_tunnel_core.c:600:45: warning: restricted __be16 degrades to integer > net/ipv4/ip_tunnel_core.c:609:30: warning: incorrect type in assignment (different base types) > net/ipv4/ip_tunnel_core.c:609:30: expected int type > net/ipv4/ip_tunnel_core.c:609:30: got restricted __be16 [usertype] > net/ipv4/ip_tunnel_core.c:619:30: warning: incorrect type in assignment (different base types) > net/ipv4/ip_tunnel_core.c:619:30: expected int type > net/ipv4/ip_tunnel_core.c:619:30: got restricted __be16 [usertype] > net/ipv4/ip_tunnel_core.c:629:30: warning: incorrect type in assignment (different base types) > net/ipv4/ip_tunnel_core.c:629:30: expected int type > net/ipv4/ip_tunnel_core.c:629:30: got restricted __be16 [usertype] The TUNNEL_* types are big-endian, so adjust the type of the local variable in ip_tun_parse_opts(). Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Link: https://lore.kernel.org/r/20210107144008.25777-1-jwi@linux.ibm.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1081 lines
29 KiB
C
1081 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2013 Nicira, Inc.
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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/ip6_tunnel.h>
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#include <net/ip6_checksum.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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#include <net/geneve.h>
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#include <net/vxlan.h>
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#include <net/erspan.h>
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const struct ip_tunnel_encap_ops __rcu *
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iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
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EXPORT_SYMBOL(iptun_encaps);
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const struct ip6_tnl_encap_ops __rcu *
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ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
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EXPORT_SYMBOL(ip6tun_encaps);
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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_if_not_l4(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 = ip_mtu_locked(&rt->dst) ? 0 : 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 (dev) {
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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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}
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EXPORT_SYMBOL_GPL(iptunnel_xmit);
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int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
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__be16 inner_proto, bool raw_proto, bool xnet)
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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 (!raw_proto && 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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skb_clear_hash_if_not_l4(skb);
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__vlan_hwaccel_clear_tag(skb);
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skb_set_queue_mapping(skb, 0);
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skb_scrub_packet(skb, xnet);
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return iptunnel_pull_offloads(skb);
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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->type != METADATA_IP_TUNNEL ||
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md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
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return NULL;
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src = &md->u.tun_info;
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res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, 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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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->key.tun_flags = src->key.tun_flags;
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dst->mode = src->mode | IP_TUNNEL_INFO_TX;
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ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
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src->options_len, 0);
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return res;
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}
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EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
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int iptunnel_handle_offloads(struct sk_buff *skb,
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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_header_unclone(skb, GFP_ATOMIC);
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if (unlikely(err))
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return err;
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skb_shinfo(skb)->gso_type |= gso_type_mask;
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return 0;
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}
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if (skb->ip_summed != CHECKSUM_PARTIAL) {
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skb->ip_summed = CHECKSUM_NONE;
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/* We clear encapsulation here to prevent badly-written
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* drivers potentially deciding to offload an inner checksum
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* if we set CHECKSUM_PARTIAL on the outer header.
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* This should go away when the drivers are all fixed.
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*/
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skb->encapsulation = 0;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
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/**
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* iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD
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* @skb: Original packet with L2 header
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* @mtu: MTU value for ICMP error
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*
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* Return: length on success, negative error code if message couldn't be built.
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*/
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static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu)
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{
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const struct iphdr *iph = ip_hdr(skb);
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struct icmphdr *icmph;
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struct iphdr *niph;
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struct ethhdr eh;
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int len, err;
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if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr)))
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return -EINVAL;
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skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
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pskb_pull(skb, ETH_HLEN);
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skb_reset_network_header(skb);
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err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph));
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if (err)
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return err;
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len = skb->len + sizeof(*icmph);
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err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN);
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if (err)
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return err;
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icmph = skb_push(skb, sizeof(*icmph));
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*icmph = (struct icmphdr) {
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.type = ICMP_DEST_UNREACH,
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.code = ICMP_FRAG_NEEDED,
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.checksum = 0,
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.un.frag.__unused = 0,
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.un.frag.mtu = htons(mtu),
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};
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icmph->checksum = ip_compute_csum(icmph, len);
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skb_reset_transport_header(skb);
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niph = skb_push(skb, sizeof(*niph));
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*niph = (struct iphdr) {
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.ihl = sizeof(*niph) / 4u,
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.version = 4,
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.tos = 0,
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.tot_len = htons(len + sizeof(*niph)),
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.id = 0,
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.frag_off = htons(IP_DF),
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.ttl = iph->ttl,
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.protocol = IPPROTO_ICMP,
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.saddr = iph->daddr,
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.daddr = iph->saddr,
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};
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ip_send_check(niph);
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skb_reset_network_header(skb);
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skb->ip_summed = CHECKSUM_NONE;
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eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
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skb_reset_mac_header(skb);
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return skb->len;
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}
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/**
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* iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed
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* @skb: Buffer being sent by encapsulation, L2 headers expected
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* @mtu: Network MTU for path
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*
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* Return: 0 for no ICMP reply, length if built, negative value on error.
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*/
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static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu)
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{
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const struct icmphdr *icmph = icmp_hdr(skb);
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const struct iphdr *iph = ip_hdr(skb);
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if (mtu < 576 || iph->frag_off != htons(IP_DF))
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return 0;
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if (ipv4_is_lbcast(iph->daddr) || ipv4_is_multicast(iph->daddr) ||
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ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr) ||
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ipv4_is_lbcast(iph->saddr) || ipv4_is_multicast(iph->saddr))
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return 0;
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if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type))
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return 0;
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return iptunnel_pmtud_build_icmp(skb, mtu);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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/**
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* iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD
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* @skb: Original packet with L2 header
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* @mtu: MTU value for ICMPv6 error
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*
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* Return: length on success, negative error code if message couldn't be built.
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*/
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static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu)
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{
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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struct icmp6hdr *icmp6h;
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struct ipv6hdr *nip6h;
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struct ethhdr eh;
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int len, err;
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__wsum csum;
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if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr)))
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return -EINVAL;
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skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN);
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pskb_pull(skb, ETH_HLEN);
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skb_reset_network_header(skb);
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err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h));
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if (err)
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return err;
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len = skb->len + sizeof(*icmp6h);
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err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN);
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if (err)
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return err;
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icmp6h = skb_push(skb, sizeof(*icmp6h));
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*icmp6h = (struct icmp6hdr) {
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.icmp6_type = ICMPV6_PKT_TOOBIG,
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.icmp6_code = 0,
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.icmp6_cksum = 0,
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.icmp6_mtu = htonl(mtu),
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};
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skb_reset_transport_header(skb);
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nip6h = skb_push(skb, sizeof(*nip6h));
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*nip6h = (struct ipv6hdr) {
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.priority = 0,
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.version = 6,
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.flow_lbl = { 0 },
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.payload_len = htons(len),
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.nexthdr = IPPROTO_ICMPV6,
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.hop_limit = ip6h->hop_limit,
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.saddr = ip6h->daddr,
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.daddr = ip6h->saddr,
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};
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skb_reset_network_header(skb);
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csum = csum_partial(icmp6h, len, 0);
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icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len,
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IPPROTO_ICMPV6, csum);
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skb->ip_summed = CHECKSUM_NONE;
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eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
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skb_reset_mac_header(skb);
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return skb->len;
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}
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/**
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* iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed
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* @skb: Buffer being sent by encapsulation, L2 headers expected
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* @mtu: Network MTU for path
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*
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* Return: 0 for no ICMPv6 reply, length if built, negative value on error.
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*/
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static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu)
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{
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const struct ipv6hdr *ip6h = ipv6_hdr(skb);
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int stype = ipv6_addr_type(&ip6h->saddr);
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u8 proto = ip6h->nexthdr;
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__be16 frag_off;
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int offset;
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if (mtu < IPV6_MIN_MTU)
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return 0;
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if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST ||
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stype == IPV6_ADDR_LOOPBACK)
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return 0;
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offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto,
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&frag_off);
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if (offset < 0 || (frag_off & htons(~0x7)))
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return 0;
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if (proto == IPPROTO_ICMPV6) {
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struct icmp6hdr *icmp6h;
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if (!pskb_may_pull(skb, skb_network_header(skb) +
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offset + 1 - skb->data))
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return 0;
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icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset);
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if (icmpv6_is_err(icmp6h->icmp6_type) ||
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icmp6h->icmp6_type == NDISC_REDIRECT)
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return 0;
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}
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return iptunnel_pmtud_build_icmpv6(skb, mtu);
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}
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#endif /* IS_ENABLED(CONFIG_IPV6) */
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/**
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* skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed
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* @skb: Buffer being sent by encapsulation, L2 headers expected
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* @encap_dst: Destination for tunnel encapsulation (outer IP)
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* @headroom: Encapsulation header size, bytes
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* @reply: Build matching ICMP or ICMPv6 message as a result
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*
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* L2 tunnel implementations that can carry IP and can be directly bridged
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* (currently UDP tunnels) can't always rely on IP forwarding paths to handle
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* PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built
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* based on payload and sent back by the encapsulation itself.
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*
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* For routable interfaces, we just need to update the PMTU for the destination.
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*
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* Return: 0 if ICMP error not needed, length if built, negative value on error
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*/
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int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst,
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int headroom, bool reply)
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{
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u32 mtu = dst_mtu(encap_dst) - headroom;
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if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) ||
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(!skb_is_gso(skb) && (skb->len - skb_mac_header_len(skb)) <= mtu))
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return 0;
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skb_dst_update_pmtu_no_confirm(skb, mtu);
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|
|
if (!reply || skb->pkt_type == PACKET_HOST)
|
|
return 0;
|
|
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
return iptunnel_pmtud_check_icmp(skb, mtu);
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (skb->protocol == htons(ETH_P_IPV6))
|
|
return iptunnel_pmtud_check_icmpv6(skb, mtu);
|
|
#endif
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(skb_tunnel_check_pmtu);
|
|
|
|
static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
|
|
[LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS },
|
|
[LWTUNNEL_IP_ID] = { .type = NLA_U64 },
|
|
[LWTUNNEL_IP_DST] = { .type = NLA_U32 },
|
|
[LWTUNNEL_IP_SRC] = { .type = NLA_U32 },
|
|
[LWTUNNEL_IP_TTL] = { .type = NLA_U8 },
|
|
[LWTUNNEL_IP_TOS] = { .type = NLA_U8 },
|
|
[LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 },
|
|
[LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
|
|
[LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED },
|
|
[LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED },
|
|
[LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static const struct nla_policy
|
|
geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
|
|
[LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 },
|
|
[LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 },
|
|
[LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 128 },
|
|
};
|
|
|
|
static const struct nla_policy
|
|
vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
|
|
[LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static const struct nla_policy
|
|
erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
|
|
[LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 },
|
|
[LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 },
|
|
[LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 },
|
|
[LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 },
|
|
};
|
|
|
|
static int ip_tun_parse_opts_geneve(struct nlattr *attr,
|
|
struct ip_tunnel_info *info, int opts_len,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
|
|
int data_len, err;
|
|
|
|
err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
|
|
geneve_opt_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
|
|
!tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
|
|
!tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
|
|
return -EINVAL;
|
|
|
|
attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
|
|
data_len = nla_len(attr);
|
|
if (data_len % 4)
|
|
return -EINVAL;
|
|
|
|
if (info) {
|
|
struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;
|
|
|
|
memcpy(opt->opt_data, nla_data(attr), data_len);
|
|
opt->length = data_len / 4;
|
|
attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
|
|
opt->opt_class = nla_get_be16(attr);
|
|
attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
|
|
opt->type = nla_get_u8(attr);
|
|
info->key.tun_flags |= TUNNEL_GENEVE_OPT;
|
|
}
|
|
|
|
return sizeof(struct geneve_opt) + data_len;
|
|
}
|
|
|
|
static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
|
|
struct ip_tunnel_info *info, int opts_len,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
|
|
vxlan_opt_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
|
|
return -EINVAL;
|
|
|
|
if (info) {
|
|
struct vxlan_metadata *md =
|
|
ip_tunnel_info_opts(info) + opts_len;
|
|
|
|
attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
|
|
md->gbp = nla_get_u32(attr);
|
|
md->gbp &= VXLAN_GBP_MASK;
|
|
info->key.tun_flags |= TUNNEL_VXLAN_OPT;
|
|
}
|
|
|
|
return sizeof(struct vxlan_metadata);
|
|
}
|
|
|
|
static int ip_tun_parse_opts_erspan(struct nlattr *attr,
|
|
struct ip_tunnel_info *info, int opts_len,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
|
|
int err;
|
|
u8 ver;
|
|
|
|
err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
|
|
erspan_opt_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
|
|
return -EINVAL;
|
|
|
|
ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]);
|
|
if (ver == 1) {
|
|
if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX])
|
|
return -EINVAL;
|
|
} else if (ver == 2) {
|
|
if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] ||
|
|
!tb[LWTUNNEL_IP_OPT_ERSPAN_HWID])
|
|
return -EINVAL;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (info) {
|
|
struct erspan_metadata *md =
|
|
ip_tunnel_info_opts(info) + opts_len;
|
|
|
|
md->version = ver;
|
|
if (ver == 1) {
|
|
attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
|
|
md->u.index = nla_get_be32(attr);
|
|
} else {
|
|
attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
|
|
md->u.md2.dir = nla_get_u8(attr);
|
|
attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
|
|
set_hwid(&md->u.md2, nla_get_u8(attr));
|
|
}
|
|
|
|
info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
|
|
}
|
|
|
|
return sizeof(struct erspan_metadata);
|
|
}
|
|
|
|
static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int err, rem, opt_len, opts_len = 0;
|
|
struct nlattr *nla;
|
|
__be16 type = 0;
|
|
|
|
if (!attr)
|
|
return 0;
|
|
|
|
err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX,
|
|
ip_opts_policy, extack);
|
|
if (err)
|
|
return err;
|
|
|
|
nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) {
|
|
switch (nla_type(nla)) {
|
|
case LWTUNNEL_IP_OPTS_GENEVE:
|
|
if (type && type != TUNNEL_GENEVE_OPT)
|
|
return -EINVAL;
|
|
opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len,
|
|
extack);
|
|
if (opt_len < 0)
|
|
return opt_len;
|
|
opts_len += opt_len;
|
|
if (opts_len > IP_TUNNEL_OPTS_MAX)
|
|
return -EINVAL;
|
|
type = TUNNEL_GENEVE_OPT;
|
|
break;
|
|
case LWTUNNEL_IP_OPTS_VXLAN:
|
|
if (type)
|
|
return -EINVAL;
|
|
opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len,
|
|
extack);
|
|
if (opt_len < 0)
|
|
return opt_len;
|
|
opts_len += opt_len;
|
|
type = TUNNEL_VXLAN_OPT;
|
|
break;
|
|
case LWTUNNEL_IP_OPTS_ERSPAN:
|
|
if (type)
|
|
return -EINVAL;
|
|
opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len,
|
|
extack);
|
|
if (opt_len < 0)
|
|
return opt_len;
|
|
opts_len += opt_len;
|
|
type = TUNNEL_ERSPAN_OPT;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return opts_len;
|
|
}
|
|
|
|
static int ip_tun_get_optlen(struct nlattr *attr,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return ip_tun_parse_opts(attr, NULL, extack);
|
|
}
|
|
|
|
static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return ip_tun_parse_opts(attr, info, extack);
|
|
}
|
|
|
|
static int ip_tun_build_state(struct net *net, struct nlattr *attr,
|
|
unsigned int family, const void *cfg,
|
|
struct lwtunnel_state **ts,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
|
|
struct lwtunnel_state *new_state;
|
|
struct ip_tunnel_info *tun_info;
|
|
int err, opt_len;
|
|
|
|
err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
|
|
ip_tun_policy, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
|
|
if (opt_len < 0)
|
|
return opt_len;
|
|
|
|
new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
|
|
if (!new_state)
|
|
return -ENOMEM;
|
|
|
|
new_state->type = LWTUNNEL_ENCAP_IP;
|
|
|
|
tun_info = lwt_tun_info(new_state);
|
|
|
|
err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
|
|
if (err < 0) {
|
|
lwtstate_free(new_state);
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_DST_CACHE
|
|
err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
|
|
if (err) {
|
|
lwtstate_free(new_state);
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
if (tb[LWTUNNEL_IP_ID])
|
|
tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
|
|
|
|
if (tb[LWTUNNEL_IP_DST])
|
|
tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
|
|
|
|
if (tb[LWTUNNEL_IP_SRC])
|
|
tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
|
|
|
|
if (tb[LWTUNNEL_IP_TTL])
|
|
tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
|
|
|
|
if (tb[LWTUNNEL_IP_TOS])
|
|
tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
|
|
|
|
if (tb[LWTUNNEL_IP_FLAGS])
|
|
tun_info->key.tun_flags |=
|
|
(nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) &
|
|
~TUNNEL_OPTIONS_PRESENT);
|
|
|
|
tun_info->mode = IP_TUNNEL_INFO_TX;
|
|
tun_info->options_len = opt_len;
|
|
|
|
*ts = new_state;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
|
|
{
|
|
#ifdef CONFIG_DST_CACHE
|
|
struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
|
|
|
|
dst_cache_destroy(&tun_info->dst_cache);
|
|
#endif
|
|
}
|
|
|
|
static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
|
|
struct ip_tunnel_info *tun_info)
|
|
{
|
|
struct geneve_opt *opt;
|
|
struct nlattr *nest;
|
|
int offset = 0;
|
|
|
|
nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
|
|
if (!nest)
|
|
return -ENOMEM;
|
|
|
|
while (tun_info->options_len > offset) {
|
|
opt = ip_tunnel_info_opts(tun_info) + offset;
|
|
if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS,
|
|
opt->opt_class) ||
|
|
nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
|
|
nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
|
|
opt->opt_data)) {
|
|
nla_nest_cancel(skb, nest);
|
|
return -ENOMEM;
|
|
}
|
|
offset += sizeof(*opt) + opt->length * 4;
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
}
|
|
|
|
static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
|
|
struct ip_tunnel_info *tun_info)
|
|
{
|
|
struct vxlan_metadata *md;
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
|
|
if (!nest)
|
|
return -ENOMEM;
|
|
|
|
md = ip_tunnel_info_opts(tun_info);
|
|
if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
|
|
nla_nest_cancel(skb, nest);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
}
|
|
|
|
static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
|
|
struct ip_tunnel_info *tun_info)
|
|
{
|
|
struct erspan_metadata *md;
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
|
|
if (!nest)
|
|
return -ENOMEM;
|
|
|
|
md = ip_tunnel_info_opts(tun_info);
|
|
if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
|
|
goto err;
|
|
|
|
if (md->version == 1 &&
|
|
nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
|
|
goto err;
|
|
|
|
if (md->version == 2 &&
|
|
(nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
|
|
nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
|
|
get_hwid(&md->u.md2))))
|
|
goto err;
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
err:
|
|
nla_nest_cancel(skb, nest);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
|
|
struct ip_tunnel_info *tun_info)
|
|
{
|
|
struct nlattr *nest;
|
|
int err = 0;
|
|
|
|
if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
|
|
return 0;
|
|
|
|
nest = nla_nest_start_noflag(skb, type);
|
|
if (!nest)
|
|
return -ENOMEM;
|
|
|
|
if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
|
|
err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
|
|
else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
|
|
err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
|
|
else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)
|
|
err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
|
|
|
|
if (err) {
|
|
nla_nest_cancel(skb, nest);
|
|
return err;
|
|
}
|
|
|
|
nla_nest_end(skb, nest);
|
|
return 0;
|
|
}
|
|
|
|
static int ip_tun_fill_encap_info(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwtstate)
|
|
{
|
|
struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
|
|
|
|
if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
|
|
LWTUNNEL_IP_PAD) ||
|
|
nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
|
|
nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
|
|
nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
|
|
nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
|
|
nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
|
|
ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
|
|
{
|
|
int opt_len;
|
|
|
|
if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
|
|
return 0;
|
|
|
|
opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */
|
|
if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
|
|
struct geneve_opt *opt;
|
|
int offset = 0;
|
|
|
|
opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */
|
|
while (info->options_len > offset) {
|
|
opt = ip_tunnel_info_opts(info) + offset;
|
|
opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */
|
|
+ nla_total_size(1) /* OPT_GENEVE_TYPE */
|
|
+ nla_total_size(opt->length * 4);
|
|
/* OPT_GENEVE_DATA */
|
|
offset += sizeof(*opt) + opt->length * 4;
|
|
}
|
|
} else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
|
|
opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */
|
|
+ nla_total_size(4); /* OPT_VXLAN_GBP */
|
|
} else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
|
|
struct erspan_metadata *md = ip_tunnel_info_opts(info);
|
|
|
|
opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */
|
|
+ nla_total_size(1) /* OPT_ERSPAN_VER */
|
|
+ (md->version == 1 ? nla_total_size(4)
|
|
/* OPT_ERSPAN_INDEX (v1) */
|
|
: nla_total_size(1) +
|
|
nla_total_size(1));
|
|
/* OPT_ERSPAN_DIR + HWID (v2) */
|
|
}
|
|
|
|
return opt_len;
|
|
}
|
|
|
|
static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
|
|
{
|
|
return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */
|
|
+ nla_total_size(4) /* LWTUNNEL_IP_DST */
|
|
+ nla_total_size(4) /* LWTUNNEL_IP_SRC */
|
|
+ nla_total_size(1) /* LWTUNNEL_IP_TOS */
|
|
+ nla_total_size(1) /* LWTUNNEL_IP_TTL */
|
|
+ nla_total_size(2) /* LWTUNNEL_IP_FLAGS */
|
|
+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
|
|
/* LWTUNNEL_IP_OPTS */
|
|
}
|
|
|
|
static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
|
|
{
|
|
struct ip_tunnel_info *info_a = lwt_tun_info(a);
|
|
struct ip_tunnel_info *info_b = lwt_tun_info(b);
|
|
|
|
return memcmp(info_a, info_b, sizeof(info_a->key)) ||
|
|
info_a->mode != info_b->mode ||
|
|
info_a->options_len != info_b->options_len ||
|
|
memcmp(ip_tunnel_info_opts(info_a),
|
|
ip_tunnel_info_opts(info_b), info_a->options_len);
|
|
}
|
|
|
|
static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
|
|
.build_state = ip_tun_build_state,
|
|
.destroy_state = ip_tun_destroy_state,
|
|
.fill_encap = ip_tun_fill_encap_info,
|
|
.get_encap_size = ip_tun_encap_nlsize,
|
|
.cmp_encap = ip_tun_cmp_encap,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
|
|
[LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS },
|
|
[LWTUNNEL_IP6_ID] = { .type = NLA_U64 },
|
|
[LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) },
|
|
[LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) },
|
|
[LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 },
|
|
[LWTUNNEL_IP6_TC] = { .type = NLA_U8 },
|
|
[LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 },
|
|
[LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int ip6_tun_build_state(struct net *net, struct nlattr *attr,
|
|
unsigned int family, const void *cfg,
|
|
struct lwtunnel_state **ts,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
|
|
struct lwtunnel_state *new_state;
|
|
struct ip_tunnel_info *tun_info;
|
|
int err, opt_len;
|
|
|
|
err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
|
|
ip6_tun_policy, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
|
|
if (opt_len < 0)
|
|
return opt_len;
|
|
|
|
new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
|
|
if (!new_state)
|
|
return -ENOMEM;
|
|
|
|
new_state->type = LWTUNNEL_ENCAP_IP6;
|
|
|
|
tun_info = lwt_tun_info(new_state);
|
|
|
|
err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
|
|
if (err < 0) {
|
|
lwtstate_free(new_state);
|
|
return err;
|
|
}
|
|
|
|
if (tb[LWTUNNEL_IP6_ID])
|
|
tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
|
|
|
|
if (tb[LWTUNNEL_IP6_DST])
|
|
tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
|
|
|
|
if (tb[LWTUNNEL_IP6_SRC])
|
|
tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
|
|
|
|
if (tb[LWTUNNEL_IP6_HOPLIMIT])
|
|
tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
|
|
|
|
if (tb[LWTUNNEL_IP6_TC])
|
|
tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
|
|
|
|
if (tb[LWTUNNEL_IP6_FLAGS])
|
|
tun_info->key.tun_flags |=
|
|
(nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) &
|
|
~TUNNEL_OPTIONS_PRESENT);
|
|
|
|
tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
|
|
tun_info->options_len = opt_len;
|
|
|
|
*ts = new_state;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_tun_fill_encap_info(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwtstate)
|
|
{
|
|
struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
|
|
|
|
if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
|
|
LWTUNNEL_IP6_PAD) ||
|
|
nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
|
|
nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
|
|
nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
|
|
nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
|
|
nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
|
|
ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
|
|
{
|
|
return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */
|
|
+ nla_total_size(16) /* LWTUNNEL_IP6_DST */
|
|
+ nla_total_size(16) /* LWTUNNEL_IP6_SRC */
|
|
+ nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */
|
|
+ nla_total_size(1) /* LWTUNNEL_IP6_TC */
|
|
+ nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */
|
|
+ ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
|
|
/* LWTUNNEL_IP6_OPTS */
|
|
}
|
|
|
|
static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
|
|
.build_state = ip6_tun_build_state,
|
|
.fill_encap = ip6_tun_fill_encap_info,
|
|
.get_encap_size = ip6_tun_encap_nlsize,
|
|
.cmp_encap = ip_tun_cmp_encap,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
void __init ip_tunnel_core_init(void)
|
|
{
|
|
/* If you land here, make sure whether increasing ip_tunnel_info's
|
|
* options_len is a reasonable choice with its usage in front ends
|
|
* (f.e., it's part of flow keys, etc).
|
|
*/
|
|
BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
|
|
|
|
lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
|
|
lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
|
|
}
|
|
|
|
DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
|
|
EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
|
|
|
|
void ip_tunnel_need_metadata(void)
|
|
{
|
|
static_branch_inc(&ip_tunnel_metadata_cnt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
|
|
|
|
void ip_tunnel_unneed_metadata(void)
|
|
{
|
|
static_branch_dec(&ip_tunnel_metadata_cnt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);
|
|
|
|
/* Returns either the correct skb->protocol value, or 0 if invalid. */
|
|
__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb)
|
|
{
|
|
if (skb_network_header(skb) >= skb->head &&
|
|
(skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) &&
|
|
ip_hdr(skb)->version == 4)
|
|
return htons(ETH_P_IP);
|
|
if (skb_network_header(skb) >= skb->head &&
|
|
(skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) &&
|
|
ipv6_hdr(skb)->version == 6)
|
|
return htons(ETH_P_IPV6);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ip_tunnel_parse_protocol);
|
|
|
|
const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
|
|
EXPORT_SYMBOL(ip_tunnel_header_ops);
|