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1f07d03e20
With GRO/LRO processing, there is a problem because Ip[6]InReceives SNMP counters do not count the number of frames, but number of aggregated segments. Its probably too late to change this now. This patch adds four new counters, tracking number of frames, regardless of LRO/GRO, and on a per ECN status basis, for IPv4 and IPv6. Ip[6]NoECTPkts : Number of packets received with NOECT Ip[6]ECT1Pkts : Number of packets received with ECT(1) Ip[6]ECT0Pkts : Number of packets received with ECT(0) Ip[6]CEPkts : Number of packets received with Congestion Experienced lph37:~# nstat | egrep "Pkts|InReceive" IpInReceives 1634137 0.0 Ip6InReceives 3714107 0.0 Ip6InNoECTPkts 19205 0.0 Ip6InECT0Pkts 52651828 0.0 IpExtInNoECTPkts 33630 0.0 IpExtInECT0Pkts 15581379 0.0 IpExtInCEPkts 6 0.0 Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
362 lines
8.7 KiB
C
362 lines
8.7 KiB
C
/*
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* IPv6 input
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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* Ian P. Morris <I.P.Morris@soton.ac.uk>
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*
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* Based in linux/net/ipv4/ip_input.c
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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 the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/* Changes
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*
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* Mitsuru KANDA @USAGI and
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* YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/netdevice.h>
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#include <linux/in6.h>
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#include <linux/icmpv6.h>
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#include <linux/mroute6.h>
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#include <linux/slab.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/transp_v6.h>
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#include <net/rawv6.h>
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#include <net/ndisc.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/xfrm.h>
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#include <net/inet_ecn.h>
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int ip6_rcv_finish(struct sk_buff *skb)
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{
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if (sysctl_ip_early_demux && !skb_dst(skb)) {
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const struct inet6_protocol *ipprot;
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ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]);
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if (ipprot && ipprot->early_demux)
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ipprot->early_demux(skb);
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}
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if (!skb_dst(skb))
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ip6_route_input(skb);
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return dst_input(skb);
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}
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int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
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{
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const struct ipv6hdr *hdr;
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u32 pkt_len;
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struct inet6_dev *idev;
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struct net *net = dev_net(skb->dev);
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if (skb->pkt_type == PACKET_OTHERHOST) {
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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rcu_read_lock();
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idev = __in6_dev_get(skb->dev);
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IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_IN, skb->len);
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if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
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!idev || unlikely(idev->cnf.disable_ipv6)) {
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
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goto drop;
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}
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memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
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/*
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* Store incoming device index. When the packet will
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* be queued, we cannot refer to skb->dev anymore.
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*
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* BTW, when we send a packet for our own local address on a
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* non-loopback interface (e.g. ethX), it is being delivered
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* via the loopback interface (lo) here; skb->dev = loopback_dev.
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* It, however, should be considered as if it is being
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* arrived via the sending interface (ethX), because of the
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* nature of scoping architecture. --yoshfuji
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*/
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IP6CB(skb)->iif = skb_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
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if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
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goto err;
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hdr = ipv6_hdr(skb);
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if (hdr->version != 6)
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goto err;
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IP6_ADD_STATS_BH(dev_net(dev), idev,
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IPSTATS_MIB_NOECTPKTS +
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(ipv6_get_dsfield(hdr) & INET_ECN_MASK),
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max_t(unsigned short, 1, skb_shinfo(skb)->gso_segs));
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/*
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* RFC4291 2.5.3
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* A packet received on an interface with a destination address
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* of loopback must be dropped.
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*/
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if (!(dev->flags & IFF_LOOPBACK) &&
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ipv6_addr_loopback(&hdr->daddr))
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goto err;
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/* RFC4291 Errata ID: 3480
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* Interface-Local scope spans only a single interface on a
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* node and is useful only for loopback transmission of
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* multicast. Packets with interface-local scope received
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* from another node must be discarded.
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*/
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if (!(skb->pkt_type == PACKET_LOOPBACK ||
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dev->flags & IFF_LOOPBACK) &&
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ipv6_addr_is_multicast(&hdr->daddr) &&
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IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1)
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goto err;
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/* RFC4291 2.7
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* Nodes must not originate a packet to a multicast address whose scope
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* field contains the reserved value 0; if such a packet is received, it
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* must be silently dropped.
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*/
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if (ipv6_addr_is_multicast(&hdr->daddr) &&
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IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0)
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goto err;
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/*
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* RFC4291 2.7
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* Multicast addresses must not be used as source addresses in IPv6
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* packets or appear in any Routing header.
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*/
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if (ipv6_addr_is_multicast(&hdr->saddr))
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goto err;
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skb->transport_header = skb->network_header + sizeof(*hdr);
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IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
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pkt_len = ntohs(hdr->payload_len);
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/* pkt_len may be zero if Jumbo payload option is present */
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if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
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if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
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IP6_INC_STATS_BH(net,
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idev, IPSTATS_MIB_INTRUNCATEDPKTS);
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goto drop;
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}
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if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
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goto drop;
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}
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hdr = ipv6_hdr(skb);
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}
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if (hdr->nexthdr == NEXTHDR_HOP) {
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if (ipv6_parse_hopopts(skb) < 0) {
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
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rcu_read_unlock();
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return NET_RX_DROP;
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}
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}
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rcu_read_unlock();
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/* Must drop socket now because of tproxy. */
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skb_orphan(skb);
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return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, dev, NULL,
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ip6_rcv_finish);
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err:
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INHDRERRORS);
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drop:
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rcu_read_unlock();
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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/*
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* Deliver the packet to the host
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*/
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static int ip6_input_finish(struct sk_buff *skb)
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{
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struct net *net = dev_net(skb_dst(skb)->dev);
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const struct inet6_protocol *ipprot;
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struct inet6_dev *idev;
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unsigned int nhoff;
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int nexthdr;
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bool raw;
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/*
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* Parse extension headers
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*/
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rcu_read_lock();
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resubmit:
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idev = ip6_dst_idev(skb_dst(skb));
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if (!pskb_pull(skb, skb_transport_offset(skb)))
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goto discard;
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nhoff = IP6CB(skb)->nhoff;
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nexthdr = skb_network_header(skb)[nhoff];
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raw = raw6_local_deliver(skb, nexthdr);
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if ((ipprot = rcu_dereference(inet6_protos[nexthdr])) != NULL) {
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int ret;
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if (ipprot->flags & INET6_PROTO_FINAL) {
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const struct ipv6hdr *hdr;
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/* Free reference early: we don't need it any more,
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and it may hold ip_conntrack module loaded
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indefinitely. */
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nf_reset(skb);
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skb_postpull_rcsum(skb, skb_network_header(skb),
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skb_network_header_len(skb));
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hdr = ipv6_hdr(skb);
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if (ipv6_addr_is_multicast(&hdr->daddr) &&
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!ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
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&hdr->saddr) &&
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!ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb)))
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goto discard;
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}
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if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
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!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
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goto discard;
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ret = ipprot->handler(skb);
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if (ret > 0)
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goto resubmit;
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else if (ret == 0)
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
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} else {
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if (!raw) {
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if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
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IP6_INC_STATS_BH(net, idev,
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IPSTATS_MIB_INUNKNOWNPROTOS);
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icmpv6_send(skb, ICMPV6_PARAMPROB,
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ICMPV6_UNK_NEXTHDR, nhoff);
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}
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kfree_skb(skb);
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} else {
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
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consume_skb(skb);
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}
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}
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rcu_read_unlock();
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return 0;
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discard:
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IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDISCARDS);
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rcu_read_unlock();
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kfree_skb(skb);
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return 0;
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}
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int ip6_input(struct sk_buff *skb)
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{
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return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN, skb, skb->dev, NULL,
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ip6_input_finish);
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}
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int ip6_mc_input(struct sk_buff *skb)
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{
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const struct ipv6hdr *hdr;
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bool deliver;
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IP6_UPD_PO_STATS_BH(dev_net(skb_dst(skb)->dev),
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ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INMCAST,
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skb->len);
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hdr = ipv6_hdr(skb);
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deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
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#ifdef CONFIG_IPV6_MROUTE
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/*
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* IPv6 multicast router mode is now supported ;)
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*/
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if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
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!(ipv6_addr_type(&hdr->daddr) &
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(IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) &&
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likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
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/*
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* Okay, we try to forward - split and duplicate
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* packets.
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*/
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struct sk_buff *skb2;
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struct inet6_skb_parm *opt = IP6CB(skb);
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/* Check for MLD */
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if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
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/* Check if this is a mld message */
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u8 nexthdr = hdr->nexthdr;
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__be16 frag_off;
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int offset;
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/* Check if the value of Router Alert
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* is for MLD (0x0000).
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*/
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if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) {
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deliver = false;
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if (!ipv6_ext_hdr(nexthdr)) {
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/* BUG */
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goto out;
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}
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offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
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&nexthdr, &frag_off);
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if (offset < 0)
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goto out;
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if (!ipv6_is_mld(skb, nexthdr, offset))
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goto out;
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deliver = true;
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}
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/* unknown RA - process it normally */
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}
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if (deliver)
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skb2 = skb_clone(skb, GFP_ATOMIC);
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else {
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skb2 = skb;
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skb = NULL;
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}
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if (skb2) {
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ip6_mr_input(skb2);
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}
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}
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out:
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#endif
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if (likely(deliver))
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ip6_input(skb);
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else {
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/* discard */
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kfree_skb(skb);
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}
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return 0;
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}
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