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2001 lines
51 KiB
2001 lines
51 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* IPv6 output functions |
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* Linux INET6 implementation |
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* |
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* Authors: |
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* Pedro Roque <[email protected]> |
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* |
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* Based on linux/net/ipv4/ip_output.c |
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* |
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* Changes: |
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* A.N.Kuznetsov : airthmetics in fragmentation. |
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* extension headers are implemented. |
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* route changes now work. |
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* ip6_forward does not confuse sniffers. |
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* etc. |
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* |
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* H. von Brand : Added missing #include <linux/string.h> |
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* Imran Patel : frag id should be in NBO |
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* Kazunori MIYAZAWA @USAGI |
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* : add ip6_append_data and related functions |
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* for datagram xmit |
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*/ |
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|
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/socket.h> |
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#include <linux/net.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/in6.h> |
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#include <linux/tcp.h> |
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#include <linux/route.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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|
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#include <linux/bpf-cgroup.h> |
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#include <linux/netfilter.h> |
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#include <linux/netfilter_ipv6.h> |
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|
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#include <net/sock.h> |
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#include <net/snmp.h> |
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|
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#include <net/ipv6.h> |
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#include <net/ndisc.h> |
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#include <net/protocol.h> |
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#include <net/ip6_route.h> |
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#include <net/addrconf.h> |
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#include <net/rawv6.h> |
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#include <net/icmp.h> |
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#include <net/xfrm.h> |
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#include <net/checksum.h> |
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#include <linux/mroute6.h> |
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#include <net/l3mdev.h> |
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#include <net/lwtunnel.h> |
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#include <net/ip_tunnels.h> |
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|
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static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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struct dst_entry *dst = skb_dst(skb); |
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struct net_device *dev = dst->dev; |
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struct inet6_dev *idev = ip6_dst_idev(dst); |
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unsigned int hh_len = LL_RESERVED_SPACE(dev); |
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const struct in6_addr *daddr, *nexthop; |
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struct ipv6hdr *hdr; |
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struct neighbour *neigh; |
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int ret; |
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|
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/* Be paranoid, rather than too clever. */ |
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if (unlikely(hh_len > skb_headroom(skb)) && dev->header_ops) { |
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skb = skb_expand_head(skb, hh_len); |
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if (!skb) { |
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IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
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return -ENOMEM; |
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} |
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} |
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|
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hdr = ipv6_hdr(skb); |
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daddr = &hdr->daddr; |
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if (ipv6_addr_is_multicast(daddr)) { |
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if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) && |
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((mroute6_is_socket(net, skb) && |
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!(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
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ipv6_chk_mcast_addr(dev, daddr, &hdr->saddr))) { |
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struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
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|
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/* Do not check for IFF_ALLMULTI; multicast routing |
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is not supported in any case. |
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*/ |
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if (newskb) |
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NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
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net, sk, newskb, NULL, newskb->dev, |
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dev_loopback_xmit); |
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|
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if (hdr->hop_limit == 0) { |
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IP6_INC_STATS(net, idev, |
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IPSTATS_MIB_OUTDISCARDS); |
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kfree_skb(skb); |
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return 0; |
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} |
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} |
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|
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IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len); |
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if (IPV6_ADDR_MC_SCOPE(daddr) <= IPV6_ADDR_SCOPE_NODELOCAL && |
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!(dev->flags & IFF_LOOPBACK)) { |
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kfree_skb(skb); |
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return 0; |
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} |
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} |
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|
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if (lwtunnel_xmit_redirect(dst->lwtstate)) { |
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int res = lwtunnel_xmit(skb); |
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|
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if (res < 0 || res == LWTUNNEL_XMIT_DONE) |
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return res; |
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} |
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rcu_read_lock_bh(); |
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nexthop = rt6_nexthop((struct rt6_info *)dst, daddr); |
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neigh = __ipv6_neigh_lookup_noref(dev, nexthop); |
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if (unlikely(!neigh)) |
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neigh = __neigh_create(&nd_tbl, nexthop, dev, false); |
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if (!IS_ERR(neigh)) { |
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sock_confirm_neigh(skb, neigh); |
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ret = neigh_output(neigh, skb, false); |
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rcu_read_unlock_bh(); |
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return ret; |
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} |
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rcu_read_unlock_bh(); |
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IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTNOROUTES); |
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kfree_skb(skb); |
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return -EINVAL; |
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} |
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|
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static int |
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ip6_finish_output_gso_slowpath_drop(struct net *net, struct sock *sk, |
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struct sk_buff *skb, unsigned int mtu) |
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{ |
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struct sk_buff *segs, *nskb; |
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netdev_features_t features; |
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int ret = 0; |
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|
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/* Please see corresponding comment in ip_finish_output_gso |
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* describing the cases where GSO segment length exceeds the |
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* egress MTU. |
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*/ |
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features = netif_skb_features(skb); |
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segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK); |
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if (IS_ERR_OR_NULL(segs)) { |
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kfree_skb(skb); |
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return -ENOMEM; |
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} |
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consume_skb(skb); |
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skb_list_walk_safe(segs, segs, nskb) { |
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int err; |
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|
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skb_mark_not_on_list(segs); |
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err = ip6_fragment(net, sk, segs, ip6_finish_output2); |
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if (err && ret == 0) |
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ret = err; |
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} |
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return ret; |
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} |
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static int __ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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unsigned int mtu; |
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|
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#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM) |
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/* Policy lookup after SNAT yielded a new policy */ |
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if (skb_dst(skb)->xfrm) { |
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IP6CB(skb)->flags |= IP6SKB_REROUTED; |
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return dst_output(net, sk, skb); |
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} |
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#endif |
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mtu = ip6_skb_dst_mtu(skb); |
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if (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu)) |
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return ip6_finish_output_gso_slowpath_drop(net, sk, skb, mtu); |
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|
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if ((skb->len > mtu && !skb_is_gso(skb)) || |
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dst_allfrag(skb_dst(skb)) || |
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(IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)) |
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return ip6_fragment(net, sk, skb, ip6_finish_output2); |
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else |
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return ip6_finish_output2(net, sk, skb); |
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} |
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static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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int ret; |
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ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb); |
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switch (ret) { |
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case NET_XMIT_SUCCESS: |
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return __ip6_finish_output(net, sk, skb); |
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case NET_XMIT_CN: |
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return __ip6_finish_output(net, sk, skb) ? : ret; |
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default: |
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kfree_skb(skb); |
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return ret; |
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} |
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} |
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int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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struct net_device *dev = skb_dst(skb)->dev, *indev = skb->dev; |
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struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
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skb->protocol = htons(ETH_P_IPV6); |
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skb->dev = dev; |
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if (unlikely(idev->cnf.disable_ipv6)) { |
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IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
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kfree_skb(skb); |
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return 0; |
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} |
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return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
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net, sk, skb, indev, dev, |
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ip6_finish_output, |
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!(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
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} |
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EXPORT_SYMBOL(ip6_output); |
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bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np) |
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{ |
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if (!np->autoflowlabel_set) |
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return ip6_default_np_autolabel(net); |
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else |
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return np->autoflowlabel; |
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} |
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|
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/* |
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* xmit an sk_buff (used by TCP, SCTP and DCCP) |
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* Note : socket lock is not held for SYNACK packets, but might be modified |
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* by calls to skb_set_owner_w() and ipv6_local_error(), |
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* which are using proper atomic operations or spinlocks. |
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*/ |
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int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
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__u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority) |
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{ |
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struct net *net = sock_net(sk); |
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const struct ipv6_pinfo *np = inet6_sk(sk); |
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struct in6_addr *first_hop = &fl6->daddr; |
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struct dst_entry *dst = skb_dst(skb); |
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struct net_device *dev = dst->dev; |
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struct inet6_dev *idev = ip6_dst_idev(dst); |
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unsigned int head_room; |
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struct ipv6hdr *hdr; |
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u8 proto = fl6->flowi6_proto; |
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int seg_len = skb->len; |
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int hlimit = -1; |
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u32 mtu; |
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head_room = sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dev); |
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if (opt) |
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head_room += opt->opt_nflen + opt->opt_flen; |
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if (unlikely(head_room > skb_headroom(skb))) { |
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skb = skb_expand_head(skb, head_room); |
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if (!skb) { |
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IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
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return -ENOBUFS; |
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} |
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} |
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if (opt) { |
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seg_len += opt->opt_nflen + opt->opt_flen; |
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|
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if (opt->opt_flen) |
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ipv6_push_frag_opts(skb, opt, &proto); |
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|
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if (opt->opt_nflen) |
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ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop, |
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&fl6->saddr); |
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} |
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|
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skb_push(skb, sizeof(struct ipv6hdr)); |
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skb_reset_network_header(skb); |
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hdr = ipv6_hdr(skb); |
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|
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/* |
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* Fill in the IPv6 header |
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*/ |
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if (np) |
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hlimit = np->hop_limit; |
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if (hlimit < 0) |
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hlimit = ip6_dst_hoplimit(dst); |
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|
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ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel, |
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ip6_autoflowlabel(net, np), fl6)); |
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hdr->payload_len = htons(seg_len); |
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hdr->nexthdr = proto; |
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hdr->hop_limit = hlimit; |
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hdr->saddr = fl6->saddr; |
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hdr->daddr = *first_hop; |
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skb->protocol = htons(ETH_P_IPV6); |
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skb->priority = priority; |
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skb->mark = mark; |
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mtu = dst_mtu(dst); |
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if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) { |
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IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
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|
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/* if egress device is enslaved to an L3 master device pass the |
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* skb to its handler for processing |
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*/ |
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skb = l3mdev_ip6_out((struct sock *)sk, skb); |
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if (unlikely(!skb)) |
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return 0; |
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|
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/* hooks should never assume socket lock is held. |
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* we promote our socket to non const |
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*/ |
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return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
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net, (struct sock *)sk, skb, NULL, dev, |
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dst_output); |
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} |
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|
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skb->dev = dev; |
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/* ipv6_local_error() does not require socket lock, |
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* we promote our socket to non const |
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*/ |
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ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu); |
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|
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IP6_INC_STATS(net, idev, IPSTATS_MIB_FRAGFAILS); |
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kfree_skb(skb); |
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return -EMSGSIZE; |
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} |
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EXPORT_SYMBOL(ip6_xmit); |
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|
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static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
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{ |
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struct ip6_ra_chain *ra; |
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struct sock *last = NULL; |
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|
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read_lock(&ip6_ra_lock); |
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for (ra = ip6_ra_chain; ra; ra = ra->next) { |
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struct sock *sk = ra->sk; |
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if (sk && ra->sel == sel && |
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(!sk->sk_bound_dev_if || |
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sk->sk_bound_dev_if == skb->dev->ifindex)) { |
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struct ipv6_pinfo *np = inet6_sk(sk); |
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|
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if (np && np->rtalert_isolate && |
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!net_eq(sock_net(sk), dev_net(skb->dev))) { |
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continue; |
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} |
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if (last) { |
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struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
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if (skb2) |
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rawv6_rcv(last, skb2); |
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} |
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last = sk; |
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} |
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} |
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|
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if (last) { |
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rawv6_rcv(last, skb); |
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read_unlock(&ip6_ra_lock); |
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return 1; |
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} |
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read_unlock(&ip6_ra_lock); |
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return 0; |
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} |
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|
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static int ip6_forward_proxy_check(struct sk_buff *skb) |
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{ |
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struct ipv6hdr *hdr = ipv6_hdr(skb); |
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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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|
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if (ipv6_ext_hdr(nexthdr)) { |
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offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
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if (offset < 0) |
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return 0; |
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} else |
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offset = sizeof(struct ipv6hdr); |
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|
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if (nexthdr == IPPROTO_ICMPV6) { |
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struct icmp6hdr *icmp6; |
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|
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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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icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
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switch (icmp6->icmp6_type) { |
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case NDISC_ROUTER_SOLICITATION: |
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case NDISC_ROUTER_ADVERTISEMENT: |
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case NDISC_NEIGHBOUR_SOLICITATION: |
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case NDISC_NEIGHBOUR_ADVERTISEMENT: |
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case NDISC_REDIRECT: |
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/* For reaction involving unicast neighbor discovery |
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* message destined to the proxied address, pass it to |
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* input function. |
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*/ |
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return 1; |
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default: |
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break; |
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} |
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} |
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|
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/* |
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* The proxying router can't forward traffic sent to a link-local |
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* address, so signal the sender and discard the packet. This |
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* behavior is clarified by the MIPv6 specification. |
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*/ |
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if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { |
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dst_link_failure(skb); |
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return -1; |
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} |
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|
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return 0; |
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} |
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|
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static inline int ip6_forward_finish(struct net *net, struct sock *sk, |
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struct sk_buff *skb) |
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{ |
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struct dst_entry *dst = skb_dst(skb); |
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|
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__IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
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__IP6_ADD_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); |
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|
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#ifdef CONFIG_NET_SWITCHDEV |
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if (skb->offload_l3_fwd_mark) { |
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consume_skb(skb); |
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return 0; |
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} |
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#endif |
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|
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skb->tstamp = 0; |
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return dst_output(net, sk, skb); |
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} |
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|
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static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
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{ |
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if (skb->len <= mtu) |
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return false; |
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|
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/* ipv6 conntrack defrag sets max_frag_size + ignore_df */ |
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if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu) |
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return true; |
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|
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if (skb->ignore_df) |
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return false; |
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|
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if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) |
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return false; |
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|
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return true; |
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} |
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|
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int ip6_forward(struct sk_buff *skb) |
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{ |
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struct dst_entry *dst = skb_dst(skb); |
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struct ipv6hdr *hdr = ipv6_hdr(skb); |
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struct inet6_skb_parm *opt = IP6CB(skb); |
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struct net *net = dev_net(dst->dev); |
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struct inet6_dev *idev; |
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u32 mtu; |
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|
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idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); |
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if (net->ipv6.devconf_all->forwarding == 0) |
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goto error; |
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|
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if (skb->pkt_type != PACKET_HOST) |
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goto drop; |
|
|
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if (unlikely(skb->sk)) |
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goto drop; |
|
|
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if (skb_warn_if_lro(skb)) |
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goto drop; |
|
|
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if (!net->ipv6.devconf_all->disable_policy && |
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!idev->cnf.disable_policy && |
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!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
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__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
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goto drop; |
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} |
|
|
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skb_forward_csum(skb); |
|
|
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/* |
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* We DO NOT make any processing on |
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* RA packets, pushing them to user level AS IS |
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* without ane WARRANTY that application will be able |
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* to interpret them. The reason is that we |
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* cannot make anything clever here. |
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* |
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* We are not end-node, so that if packet contains |
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* AH/ESP, we cannot make anything. |
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* Defragmentation also would be mistake, RA packets |
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* cannot be fragmented, because there is no warranty |
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* that different fragments will go along one path. --ANK |
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*/ |
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if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
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if (ip6_call_ra_chain(skb, ntohs(opt->ra))) |
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return 0; |
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} |
|
|
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/* |
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* check and decrement ttl |
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*/ |
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if (hdr->hop_limit <= 1) { |
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icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
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__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS); |
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|
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kfree_skb(skb); |
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return -ETIMEDOUT; |
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} |
|
|
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/* XXX: idev->cnf.proxy_ndp? */ |
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if (net->ipv6.devconf_all->proxy_ndp && |
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pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
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int proxied = ip6_forward_proxy_check(skb); |
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if (proxied > 0) { |
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hdr->hop_limit--; |
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return ip6_input(skb); |
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} else if (proxied < 0) { |
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__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
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goto drop; |
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} |
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} |
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|
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if (!xfrm6_route_forward(skb)) { |
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__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS); |
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goto drop; |
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} |
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dst = skb_dst(skb); |
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|
|
/* IPv6 specs say nothing about it, but it is clear that we cannot |
|
send redirects to source routed frames. |
|
We don't send redirects to frames decapsulated from IPsec. |
|
*/ |
|
if (IP6CB(skb)->iif == dst->dev->ifindex && |
|
opt->srcrt == 0 && !skb_sec_path(skb)) { |
|
struct in6_addr *target = NULL; |
|
struct inet_peer *peer; |
|
struct rt6_info *rt; |
|
|
|
/* |
|
* incoming and outgoing devices are the same |
|
* send a redirect. |
|
*/ |
|
|
|
rt = (struct rt6_info *) dst; |
|
if (rt->rt6i_flags & RTF_GATEWAY) |
|
target = &rt->rt6i_gateway; |
|
else |
|
target = &hdr->daddr; |
|
|
|
peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1); |
|
|
|
/* Limit redirects both by destination (here) |
|
and by source (inside ndisc_send_redirect) |
|
*/ |
|
if (inet_peer_xrlim_allow(peer, 1*HZ)) |
|
ndisc_send_redirect(skb, target); |
|
if (peer) |
|
inet_putpeer(peer); |
|
} else { |
|
int addrtype = ipv6_addr_type(&hdr->saddr); |
|
|
|
/* This check is security critical. */ |
|
if (addrtype == IPV6_ADDR_ANY || |
|
addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) |
|
goto error; |
|
if (addrtype & IPV6_ADDR_LINKLOCAL) { |
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, |
|
ICMPV6_NOT_NEIGHBOUR, 0); |
|
goto error; |
|
} |
|
} |
|
|
|
mtu = ip6_dst_mtu_maybe_forward(dst, true); |
|
if (mtu < IPV6_MIN_MTU) |
|
mtu = IPV6_MIN_MTU; |
|
|
|
if (ip6_pkt_too_big(skb, mtu)) { |
|
/* Again, force OUTPUT device used as source address */ |
|
skb->dev = dst->dev; |
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
|
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INTOOBIGERRORS); |
|
__IP6_INC_STATS(net, ip6_dst_idev(dst), |
|
IPSTATS_MIB_FRAGFAILS); |
|
kfree_skb(skb); |
|
return -EMSGSIZE; |
|
} |
|
|
|
if (skb_cow(skb, dst->dev->hard_header_len)) { |
|
__IP6_INC_STATS(net, ip6_dst_idev(dst), |
|
IPSTATS_MIB_OUTDISCARDS); |
|
goto drop; |
|
} |
|
|
|
hdr = ipv6_hdr(skb); |
|
|
|
/* Mangling hops number delayed to point after skb COW */ |
|
|
|
hdr->hop_limit--; |
|
|
|
return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, |
|
net, NULL, skb, skb->dev, dst->dev, |
|
ip6_forward_finish); |
|
|
|
error: |
|
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
|
drop: |
|
kfree_skb(skb); |
|
return -EINVAL; |
|
} |
|
|
|
static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) |
|
{ |
|
to->pkt_type = from->pkt_type; |
|
to->priority = from->priority; |
|
to->protocol = from->protocol; |
|
skb_dst_drop(to); |
|
skb_dst_set(to, dst_clone(skb_dst(from))); |
|
to->dev = from->dev; |
|
to->mark = from->mark; |
|
|
|
skb_copy_hash(to, from); |
|
|
|
#ifdef CONFIG_NET_SCHED |
|
to->tc_index = from->tc_index; |
|
#endif |
|
nf_copy(to, from); |
|
skb_ext_copy(to, from); |
|
skb_copy_secmark(to, from); |
|
} |
|
|
|
int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, |
|
u8 nexthdr, __be32 frag_id, |
|
struct ip6_fraglist_iter *iter) |
|
{ |
|
unsigned int first_len; |
|
struct frag_hdr *fh; |
|
|
|
/* BUILD HEADER */ |
|
*prevhdr = NEXTHDR_FRAGMENT; |
|
iter->tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
|
if (!iter->tmp_hdr) |
|
return -ENOMEM; |
|
|
|
iter->frag = skb_shinfo(skb)->frag_list; |
|
skb_frag_list_init(skb); |
|
|
|
iter->offset = 0; |
|
iter->hlen = hlen; |
|
iter->frag_id = frag_id; |
|
iter->nexthdr = nexthdr; |
|
|
|
__skb_pull(skb, hlen); |
|
fh = __skb_push(skb, sizeof(struct frag_hdr)); |
|
__skb_push(skb, hlen); |
|
skb_reset_network_header(skb); |
|
memcpy(skb_network_header(skb), iter->tmp_hdr, hlen); |
|
|
|
fh->nexthdr = nexthdr; |
|
fh->reserved = 0; |
|
fh->frag_off = htons(IP6_MF); |
|
fh->identification = frag_id; |
|
|
|
first_len = skb_pagelen(skb); |
|
skb->data_len = first_len - skb_headlen(skb); |
|
skb->len = first_len; |
|
ipv6_hdr(skb)->payload_len = htons(first_len - sizeof(struct ipv6hdr)); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(ip6_fraglist_init); |
|
|
|
void ip6_fraglist_prepare(struct sk_buff *skb, |
|
struct ip6_fraglist_iter *iter) |
|
{ |
|
struct sk_buff *frag = iter->frag; |
|
unsigned int hlen = iter->hlen; |
|
struct frag_hdr *fh; |
|
|
|
frag->ip_summed = CHECKSUM_NONE; |
|
skb_reset_transport_header(frag); |
|
fh = __skb_push(frag, sizeof(struct frag_hdr)); |
|
__skb_push(frag, hlen); |
|
skb_reset_network_header(frag); |
|
memcpy(skb_network_header(frag), iter->tmp_hdr, hlen); |
|
iter->offset += skb->len - hlen - sizeof(struct frag_hdr); |
|
fh->nexthdr = iter->nexthdr; |
|
fh->reserved = 0; |
|
fh->frag_off = htons(iter->offset); |
|
if (frag->next) |
|
fh->frag_off |= htons(IP6_MF); |
|
fh->identification = iter->frag_id; |
|
ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); |
|
ip6_copy_metadata(frag, skb); |
|
} |
|
EXPORT_SYMBOL(ip6_fraglist_prepare); |
|
|
|
void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, |
|
unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, |
|
u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state) |
|
{ |
|
state->prevhdr = prevhdr; |
|
state->nexthdr = nexthdr; |
|
state->frag_id = frag_id; |
|
|
|
state->hlen = hlen; |
|
state->mtu = mtu; |
|
|
|
state->left = skb->len - hlen; /* Space per frame */ |
|
state->ptr = hlen; /* Where to start from */ |
|
|
|
state->hroom = hdr_room; |
|
state->troom = needed_tailroom; |
|
|
|
state->offset = 0; |
|
} |
|
EXPORT_SYMBOL(ip6_frag_init); |
|
|
|
struct sk_buff *ip6_frag_next(struct sk_buff *skb, struct ip6_frag_state *state) |
|
{ |
|
u8 *prevhdr = state->prevhdr, *fragnexthdr_offset; |
|
struct sk_buff *frag; |
|
struct frag_hdr *fh; |
|
unsigned int len; |
|
|
|
len = state->left; |
|
/* IF: it doesn't fit, use 'mtu' - the data space left */ |
|
if (len > state->mtu) |
|
len = state->mtu; |
|
/* IF: we are not sending up to and including the packet end |
|
then align the next start on an eight byte boundary */ |
|
if (len < state->left) |
|
len &= ~7; |
|
|
|
/* Allocate buffer */ |
|
frag = alloc_skb(len + state->hlen + sizeof(struct frag_hdr) + |
|
state->hroom + state->troom, GFP_ATOMIC); |
|
if (!frag) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
/* |
|
* Set up data on packet |
|
*/ |
|
|
|
ip6_copy_metadata(frag, skb); |
|
skb_reserve(frag, state->hroom); |
|
skb_put(frag, len + state->hlen + sizeof(struct frag_hdr)); |
|
skb_reset_network_header(frag); |
|
fh = (struct frag_hdr *)(skb_network_header(frag) + state->hlen); |
|
frag->transport_header = (frag->network_header + state->hlen + |
|
sizeof(struct frag_hdr)); |
|
|
|
/* |
|
* Charge the memory for the fragment to any owner |
|
* it might possess |
|
*/ |
|
if (skb->sk) |
|
skb_set_owner_w(frag, skb->sk); |
|
|
|
/* |
|
* Copy the packet header into the new buffer. |
|
*/ |
|
skb_copy_from_linear_data(skb, skb_network_header(frag), state->hlen); |
|
|
|
fragnexthdr_offset = skb_network_header(frag); |
|
fragnexthdr_offset += prevhdr - skb_network_header(skb); |
|
*fragnexthdr_offset = NEXTHDR_FRAGMENT; |
|
|
|
/* |
|
* Build fragment header. |
|
*/ |
|
fh->nexthdr = state->nexthdr; |
|
fh->reserved = 0; |
|
fh->identification = state->frag_id; |
|
|
|
/* |
|
* Copy a block of the IP datagram. |
|
*/ |
|
BUG_ON(skb_copy_bits(skb, state->ptr, skb_transport_header(frag), |
|
len)); |
|
state->left -= len; |
|
|
|
fh->frag_off = htons(state->offset); |
|
if (state->left > 0) |
|
fh->frag_off |= htons(IP6_MF); |
|
ipv6_hdr(frag)->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); |
|
|
|
state->ptr += len; |
|
state->offset += len; |
|
|
|
return frag; |
|
} |
|
EXPORT_SYMBOL(ip6_frag_next); |
|
|
|
int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
|
int (*output)(struct net *, struct sock *, struct sk_buff *)) |
|
{ |
|
struct sk_buff *frag; |
|
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
|
struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
|
inet6_sk(skb->sk) : NULL; |
|
struct ip6_frag_state state; |
|
unsigned int mtu, hlen, nexthdr_offset; |
|
ktime_t tstamp = skb->tstamp; |
|
int hroom, err = 0; |
|
__be32 frag_id; |
|
u8 *prevhdr, nexthdr = 0; |
|
|
|
err = ip6_find_1stfragopt(skb, &prevhdr); |
|
if (err < 0) |
|
goto fail; |
|
hlen = err; |
|
nexthdr = *prevhdr; |
|
nexthdr_offset = prevhdr - skb_network_header(skb); |
|
|
|
mtu = ip6_skb_dst_mtu(skb); |
|
|
|
/* We must not fragment if the socket is set to force MTU discovery |
|
* or if the skb it not generated by a local socket. |
|
*/ |
|
if (unlikely(!skb->ignore_df && skb->len > mtu)) |
|
goto fail_toobig; |
|
|
|
if (IP6CB(skb)->frag_max_size) { |
|
if (IP6CB(skb)->frag_max_size > mtu) |
|
goto fail_toobig; |
|
|
|
/* don't send fragments larger than what we received */ |
|
mtu = IP6CB(skb)->frag_max_size; |
|
if (mtu < IPV6_MIN_MTU) |
|
mtu = IPV6_MIN_MTU; |
|
} |
|
|
|
if (np && np->frag_size < mtu) { |
|
if (np->frag_size) |
|
mtu = np->frag_size; |
|
} |
|
if (mtu < hlen + sizeof(struct frag_hdr) + 8) |
|
goto fail_toobig; |
|
mtu -= hlen + sizeof(struct frag_hdr); |
|
|
|
frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr, |
|
&ipv6_hdr(skb)->saddr); |
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL && |
|
(err = skb_checksum_help(skb))) |
|
goto fail; |
|
|
|
prevhdr = skb_network_header(skb) + nexthdr_offset; |
|
hroom = LL_RESERVED_SPACE(rt->dst.dev); |
|
if (skb_has_frag_list(skb)) { |
|
unsigned int first_len = skb_pagelen(skb); |
|
struct ip6_fraglist_iter iter; |
|
struct sk_buff *frag2; |
|
|
|
if (first_len - hlen > mtu || |
|
((first_len - hlen) & 7) || |
|
skb_cloned(skb) || |
|
skb_headroom(skb) < (hroom + sizeof(struct frag_hdr))) |
|
goto slow_path; |
|
|
|
skb_walk_frags(skb, frag) { |
|
/* Correct geometry. */ |
|
if (frag->len > mtu || |
|
((frag->len & 7) && frag->next) || |
|
skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr))) |
|
goto slow_path_clean; |
|
|
|
/* Partially cloned skb? */ |
|
if (skb_shared(frag)) |
|
goto slow_path_clean; |
|
|
|
BUG_ON(frag->sk); |
|
if (skb->sk) { |
|
frag->sk = skb->sk; |
|
frag->destructor = sock_wfree; |
|
} |
|
skb->truesize -= frag->truesize; |
|
} |
|
|
|
err = ip6_fraglist_init(skb, hlen, prevhdr, nexthdr, frag_id, |
|
&iter); |
|
if (err < 0) |
|
goto fail; |
|
|
|
for (;;) { |
|
/* Prepare header of the next frame, |
|
* before previous one went down. */ |
|
if (iter.frag) |
|
ip6_fraglist_prepare(skb, &iter); |
|
|
|
skb->tstamp = tstamp; |
|
err = output(net, sk, skb); |
|
if (!err) |
|
IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
|
IPSTATS_MIB_FRAGCREATES); |
|
|
|
if (err || !iter.frag) |
|
break; |
|
|
|
skb = ip6_fraglist_next(&iter); |
|
} |
|
|
|
kfree(iter.tmp_hdr); |
|
|
|
if (err == 0) { |
|
IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
|
IPSTATS_MIB_FRAGOKS); |
|
return 0; |
|
} |
|
|
|
kfree_skb_list(iter.frag); |
|
|
|
IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
|
IPSTATS_MIB_FRAGFAILS); |
|
return err; |
|
|
|
slow_path_clean: |
|
skb_walk_frags(skb, frag2) { |
|
if (frag2 == frag) |
|
break; |
|
frag2->sk = NULL; |
|
frag2->destructor = NULL; |
|
skb->truesize += frag2->truesize; |
|
} |
|
} |
|
|
|
slow_path: |
|
/* |
|
* Fragment the datagram. |
|
*/ |
|
|
|
ip6_frag_init(skb, hlen, mtu, rt->dst.dev->needed_tailroom, |
|
LL_RESERVED_SPACE(rt->dst.dev), prevhdr, nexthdr, frag_id, |
|
&state); |
|
|
|
/* |
|
* Keep copying data until we run out. |
|
*/ |
|
|
|
while (state.left > 0) { |
|
frag = ip6_frag_next(skb, &state); |
|
if (IS_ERR(frag)) { |
|
err = PTR_ERR(frag); |
|
goto fail; |
|
} |
|
|
|
/* |
|
* Put this fragment into the sending queue. |
|
*/ |
|
frag->tstamp = tstamp; |
|
err = output(net, sk, frag); |
|
if (err) |
|
goto fail; |
|
|
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
|
IPSTATS_MIB_FRAGCREATES); |
|
} |
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
|
IPSTATS_MIB_FRAGOKS); |
|
consume_skb(skb); |
|
return err; |
|
|
|
fail_toobig: |
|
if (skb->sk && dst_allfrag(skb_dst(skb))) |
|
sk_gso_disable(skb->sk); |
|
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
|
err = -EMSGSIZE; |
|
|
|
fail: |
|
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
|
IPSTATS_MIB_FRAGFAILS); |
|
kfree_skb(skb); |
|
return err; |
|
} |
|
|
|
static inline int ip6_rt_check(const struct rt6key *rt_key, |
|
const struct in6_addr *fl_addr, |
|
const struct in6_addr *addr_cache) |
|
{ |
|
return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
|
(!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache)); |
|
} |
|
|
|
static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
|
struct dst_entry *dst, |
|
const struct flowi6 *fl6) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct rt6_info *rt; |
|
|
|
if (!dst) |
|
goto out; |
|
|
|
if (dst->ops->family != AF_INET6) { |
|
dst_release(dst); |
|
return NULL; |
|
} |
|
|
|
rt = (struct rt6_info *)dst; |
|
/* Yes, checking route validity in not connected |
|
* case is not very simple. Take into account, |
|
* that we do not support routing by source, TOS, |
|
* and MSG_DONTROUTE --ANK (980726) |
|
* |
|
* 1. ip6_rt_check(): If route was host route, |
|
* check that cached destination is current. |
|
* If it is network route, we still may |
|
* check its validity using saved pointer |
|
* to the last used address: daddr_cache. |
|
* We do not want to save whole address now, |
|
* (because main consumer of this service |
|
* is tcp, which has not this problem), |
|
* so that the last trick works only on connected |
|
* sockets. |
|
* 2. oif also should be the same. |
|
*/ |
|
if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
|
#ifdef CONFIG_IPV6_SUBTREES |
|
ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
|
#endif |
|
(!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) && |
|
(fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) { |
|
dst_release(dst); |
|
dst = NULL; |
|
} |
|
|
|
out: |
|
return dst; |
|
} |
|
|
|
static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk, |
|
struct dst_entry **dst, struct flowi6 *fl6) |
|
{ |
|
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
|
struct neighbour *n; |
|
struct rt6_info *rt; |
|
#endif |
|
int err; |
|
int flags = 0; |
|
|
|
/* The correct way to handle this would be to do |
|
* ip6_route_get_saddr, and then ip6_route_output; however, |
|
* the route-specific preferred source forces the |
|
* ip6_route_output call _before_ ip6_route_get_saddr. |
|
* |
|
* In source specific routing (no src=any default route), |
|
* ip6_route_output will fail given src=any saddr, though, so |
|
* that's why we try it again later. |
|
*/ |
|
if (ipv6_addr_any(&fl6->saddr)) { |
|
struct fib6_info *from; |
|
struct rt6_info *rt; |
|
|
|
*dst = ip6_route_output(net, sk, fl6); |
|
rt = (*dst)->error ? NULL : (struct rt6_info *)*dst; |
|
|
|
rcu_read_lock(); |
|
from = rt ? rcu_dereference(rt->from) : NULL; |
|
err = ip6_route_get_saddr(net, from, &fl6->daddr, |
|
sk ? inet6_sk(sk)->srcprefs : 0, |
|
&fl6->saddr); |
|
rcu_read_unlock(); |
|
|
|
if (err) |
|
goto out_err_release; |
|
|
|
/* If we had an erroneous initial result, pretend it |
|
* never existed and let the SA-enabled version take |
|
* over. |
|
*/ |
|
if ((*dst)->error) { |
|
dst_release(*dst); |
|
*dst = NULL; |
|
} |
|
|
|
if (fl6->flowi6_oif) |
|
flags |= RT6_LOOKUP_F_IFACE; |
|
} |
|
|
|
if (!*dst) |
|
*dst = ip6_route_output_flags(net, sk, fl6, flags); |
|
|
|
err = (*dst)->error; |
|
if (err) |
|
goto out_err_release; |
|
|
|
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
|
/* |
|
* Here if the dst entry we've looked up |
|
* has a neighbour entry that is in the INCOMPLETE |
|
* state and the src address from the flow is |
|
* marked as OPTIMISTIC, we release the found |
|
* dst entry and replace it instead with the |
|
* dst entry of the nexthop router |
|
*/ |
|
rt = (struct rt6_info *) *dst; |
|
rcu_read_lock_bh(); |
|
n = __ipv6_neigh_lookup_noref(rt->dst.dev, |
|
rt6_nexthop(rt, &fl6->daddr)); |
|
err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; |
|
rcu_read_unlock_bh(); |
|
|
|
if (err) { |
|
struct inet6_ifaddr *ifp; |
|
struct flowi6 fl_gw6; |
|
int redirect; |
|
|
|
ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
|
(*dst)->dev, 1); |
|
|
|
redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); |
|
if (ifp) |
|
in6_ifa_put(ifp); |
|
|
|
if (redirect) { |
|
/* |
|
* We need to get the dst entry for the |
|
* default router instead |
|
*/ |
|
dst_release(*dst); |
|
memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
|
memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); |
|
*dst = ip6_route_output(net, sk, &fl_gw6); |
|
err = (*dst)->error; |
|
if (err) |
|
goto out_err_release; |
|
} |
|
} |
|
#endif |
|
if (ipv6_addr_v4mapped(&fl6->saddr) && |
|
!(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr))) { |
|
err = -EAFNOSUPPORT; |
|
goto out_err_release; |
|
} |
|
|
|
return 0; |
|
|
|
out_err_release: |
|
dst_release(*dst); |
|
*dst = NULL; |
|
|
|
if (err == -ENETUNREACH) |
|
IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
|
return err; |
|
} |
|
|
|
/** |
|
* ip6_dst_lookup - perform route lookup on flow |
|
* @net: Network namespace to perform lookup in |
|
* @sk: socket which provides route info |
|
* @dst: pointer to dst_entry * for result |
|
* @fl6: flow to lookup |
|
* |
|
* This function performs a route lookup on the given flow. |
|
* |
|
* It returns zero on success, or a standard errno code on error. |
|
*/ |
|
int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, |
|
struct flowi6 *fl6) |
|
{ |
|
*dst = NULL; |
|
return ip6_dst_lookup_tail(net, sk, dst, fl6); |
|
} |
|
EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
|
|
|
/** |
|
* ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
|
* @net: Network namespace to perform lookup in |
|
* @sk: socket which provides route info |
|
* @fl6: flow to lookup |
|
* @final_dst: final destination address for ipsec lookup |
|
* |
|
* This function performs a route lookup on the given flow. |
|
* |
|
* It returns a valid dst pointer on success, or a pointer encoded |
|
* error code. |
|
*/ |
|
struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, |
|
const struct in6_addr *final_dst) |
|
{ |
|
struct dst_entry *dst = NULL; |
|
int err; |
|
|
|
err = ip6_dst_lookup_tail(net, sk, &dst, fl6); |
|
if (err) |
|
return ERR_PTR(err); |
|
if (final_dst) |
|
fl6->daddr = *final_dst; |
|
|
|
return xfrm_lookup_route(net, dst, flowi6_to_flowi(fl6), sk, 0); |
|
} |
|
EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); |
|
|
|
/** |
|
* ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow |
|
* @sk: socket which provides the dst cache and route info |
|
* @fl6: flow to lookup |
|
* @final_dst: final destination address for ipsec lookup |
|
* @connected: whether @sk is connected or not |
|
* |
|
* This function performs a route lookup on the given flow with the |
|
* possibility of using the cached route in the socket if it is valid. |
|
* It will take the socket dst lock when operating on the dst cache. |
|
* As a result, this function can only be used in process context. |
|
* |
|
* In addition, for a connected socket, cache the dst in the socket |
|
* if the current cache is not valid. |
|
* |
|
* It returns a valid dst pointer on success, or a pointer encoded |
|
* error code. |
|
*/ |
|
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
|
const struct in6_addr *final_dst, |
|
bool connected) |
|
{ |
|
struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
|
|
|
dst = ip6_sk_dst_check(sk, dst, fl6); |
|
if (dst) |
|
return dst; |
|
|
|
dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_dst); |
|
if (connected && !IS_ERR(dst)) |
|
ip6_sk_dst_store_flow(sk, dst_clone(dst), fl6); |
|
|
|
return dst; |
|
} |
|
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
|
|
|
/** |
|
* ip6_dst_lookup_tunnel - perform route lookup on tunnel |
|
* @skb: Packet for which lookup is done |
|
* @dev: Tunnel device |
|
* @net: Network namespace of tunnel device |
|
* @sock: Socket which provides route info |
|
* @saddr: Memory to store the src ip address |
|
* @info: Tunnel information |
|
* @protocol: IP protocol |
|
* @use_cache: Flag to enable cache usage |
|
* This function performs a route lookup on a tunnel |
|
* |
|
* It returns a valid dst pointer and stores src address to be used in |
|
* tunnel in param saddr on success, else a pointer encoded error code. |
|
*/ |
|
|
|
struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, |
|
struct net_device *dev, |
|
struct net *net, |
|
struct socket *sock, |
|
struct in6_addr *saddr, |
|
const struct ip_tunnel_info *info, |
|
u8 protocol, |
|
bool use_cache) |
|
{ |
|
struct dst_entry *dst = NULL; |
|
#ifdef CONFIG_DST_CACHE |
|
struct dst_cache *dst_cache; |
|
#endif |
|
struct flowi6 fl6; |
|
__u8 prio; |
|
|
|
#ifdef CONFIG_DST_CACHE |
|
dst_cache = (struct dst_cache *)&info->dst_cache; |
|
if (use_cache) { |
|
dst = dst_cache_get_ip6(dst_cache, saddr); |
|
if (dst) |
|
return dst; |
|
} |
|
#endif |
|
memset(&fl6, 0, sizeof(fl6)); |
|
fl6.flowi6_mark = skb->mark; |
|
fl6.flowi6_proto = protocol; |
|
fl6.daddr = info->key.u.ipv6.dst; |
|
fl6.saddr = info->key.u.ipv6.src; |
|
prio = info->key.tos; |
|
fl6.flowlabel = ip6_make_flowinfo(RT_TOS(prio), |
|
info->key.label); |
|
|
|
dst = ipv6_stub->ipv6_dst_lookup_flow(net, sock->sk, &fl6, |
|
NULL); |
|
if (IS_ERR(dst)) { |
|
netdev_dbg(dev, "no route to %pI6\n", &fl6.daddr); |
|
return ERR_PTR(-ENETUNREACH); |
|
} |
|
if (dst->dev == dev) { /* is this necessary? */ |
|
netdev_dbg(dev, "circular route to %pI6\n", &fl6.daddr); |
|
dst_release(dst); |
|
return ERR_PTR(-ELOOP); |
|
} |
|
#ifdef CONFIG_DST_CACHE |
|
if (use_cache) |
|
dst_cache_set_ip6(dst_cache, dst, &fl6.saddr); |
|
#endif |
|
*saddr = fl6.saddr; |
|
return dst; |
|
} |
|
EXPORT_SYMBOL_GPL(ip6_dst_lookup_tunnel); |
|
|
|
static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
|
gfp_t gfp) |
|
{ |
|
return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
|
} |
|
|
|
static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, |
|
gfp_t gfp) |
|
{ |
|
return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
|
} |
|
|
|
static void ip6_append_data_mtu(unsigned int *mtu, |
|
int *maxfraglen, |
|
unsigned int fragheaderlen, |
|
struct sk_buff *skb, |
|
struct rt6_info *rt, |
|
unsigned int orig_mtu) |
|
{ |
|
if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { |
|
if (!skb) { |
|
/* first fragment, reserve header_len */ |
|
*mtu = orig_mtu - rt->dst.header_len; |
|
|
|
} else { |
|
/* |
|
* this fragment is not first, the headers |
|
* space is regarded as data space. |
|
*/ |
|
*mtu = orig_mtu; |
|
} |
|
*maxfraglen = ((*mtu - fragheaderlen) & ~7) |
|
+ fragheaderlen - sizeof(struct frag_hdr); |
|
} |
|
} |
|
|
|
static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork, |
|
struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6, |
|
struct rt6_info *rt, struct flowi6 *fl6) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
unsigned int mtu; |
|
struct ipv6_txoptions *opt = ipc6->opt; |
|
|
|
/* |
|
* setup for corking |
|
*/ |
|
if (opt) { |
|
if (WARN_ON(v6_cork->opt)) |
|
return -EINVAL; |
|
|
|
v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation); |
|
if (unlikely(!v6_cork->opt)) |
|
return -ENOBUFS; |
|
|
|
v6_cork->opt->tot_len = sizeof(*opt); |
|
v6_cork->opt->opt_flen = opt->opt_flen; |
|
v6_cork->opt->opt_nflen = opt->opt_nflen; |
|
|
|
v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt, |
|
sk->sk_allocation); |
|
if (opt->dst0opt && !v6_cork->opt->dst0opt) |
|
return -ENOBUFS; |
|
|
|
v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt, |
|
sk->sk_allocation); |
|
if (opt->dst1opt && !v6_cork->opt->dst1opt) |
|
return -ENOBUFS; |
|
|
|
v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt, |
|
sk->sk_allocation); |
|
if (opt->hopopt && !v6_cork->opt->hopopt) |
|
return -ENOBUFS; |
|
|
|
v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt, |
|
sk->sk_allocation); |
|
if (opt->srcrt && !v6_cork->opt->srcrt) |
|
return -ENOBUFS; |
|
|
|
/* need source address above miyazawa*/ |
|
} |
|
dst_hold(&rt->dst); |
|
cork->base.dst = &rt->dst; |
|
cork->fl.u.ip6 = *fl6; |
|
v6_cork->hop_limit = ipc6->hlimit; |
|
v6_cork->tclass = ipc6->tclass; |
|
if (rt->dst.flags & DST_XFRM_TUNNEL) |
|
mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? |
|
READ_ONCE(rt->dst.dev->mtu) : dst_mtu(&rt->dst); |
|
else |
|
mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? |
|
READ_ONCE(rt->dst.dev->mtu) : dst_mtu(xfrm_dst_path(&rt->dst)); |
|
if (np->frag_size < mtu) { |
|
if (np->frag_size) |
|
mtu = np->frag_size; |
|
} |
|
if (mtu < IPV6_MIN_MTU) |
|
return -EINVAL; |
|
cork->base.fragsize = mtu; |
|
cork->base.gso_size = ipc6->gso_size; |
|
cork->base.tx_flags = 0; |
|
cork->base.mark = ipc6->sockc.mark; |
|
sock_tx_timestamp(sk, ipc6->sockc.tsflags, &cork->base.tx_flags); |
|
|
|
if (dst_allfrag(xfrm_dst_path(&rt->dst))) |
|
cork->base.flags |= IPCORK_ALLFRAG; |
|
cork->base.length = 0; |
|
|
|
cork->base.transmit_time = ipc6->sockc.transmit_time; |
|
|
|
return 0; |
|
} |
|
|
|
static int __ip6_append_data(struct sock *sk, |
|
struct flowi6 *fl6, |
|
struct sk_buff_head *queue, |
|
struct inet_cork *cork, |
|
struct inet6_cork *v6_cork, |
|
struct page_frag *pfrag, |
|
int getfrag(void *from, char *to, int offset, |
|
int len, int odd, struct sk_buff *skb), |
|
void *from, int length, int transhdrlen, |
|
unsigned int flags, struct ipcm6_cookie *ipc6) |
|
{ |
|
struct sk_buff *skb, *skb_prev = NULL; |
|
unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu; |
|
struct ubuf_info *uarg = NULL; |
|
int exthdrlen = 0; |
|
int dst_exthdrlen = 0; |
|
int hh_len; |
|
int copy; |
|
int err; |
|
int offset = 0; |
|
u32 tskey = 0; |
|
struct rt6_info *rt = (struct rt6_info *)cork->dst; |
|
struct ipv6_txoptions *opt = v6_cork->opt; |
|
int csummode = CHECKSUM_NONE; |
|
unsigned int maxnonfragsize, headersize; |
|
unsigned int wmem_alloc_delta = 0; |
|
bool paged, extra_uref = false; |
|
|
|
skb = skb_peek_tail(queue); |
|
if (!skb) { |
|
exthdrlen = opt ? opt->opt_flen : 0; |
|
dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; |
|
} |
|
|
|
paged = !!cork->gso_size; |
|
mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize; |
|
orig_mtu = mtu; |
|
|
|
if (cork->tx_flags & SKBTX_ANY_SW_TSTAMP && |
|
sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) |
|
tskey = atomic_inc_return(&sk->sk_tskey) - 1; |
|
|
|
hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
|
|
|
fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
|
(opt ? opt->opt_nflen : 0); |
|
maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - |
|
sizeof(struct frag_hdr); |
|
|
|
headersize = sizeof(struct ipv6hdr) + |
|
(opt ? opt->opt_flen + opt->opt_nflen : 0) + |
|
(dst_allfrag(&rt->dst) ? |
|
sizeof(struct frag_hdr) : 0) + |
|
rt->rt6i_nfheader_len; |
|
|
|
/* as per RFC 7112 section 5, the entire IPv6 Header Chain must fit |
|
* the first fragment |
|
*/ |
|
if (headersize + transhdrlen > mtu) |
|
goto emsgsize; |
|
|
|
if (cork->length + length > mtu - headersize && ipc6->dontfrag && |
|
(sk->sk_protocol == IPPROTO_UDP || |
|
sk->sk_protocol == IPPROTO_RAW)) { |
|
ipv6_local_rxpmtu(sk, fl6, mtu - headersize + |
|
sizeof(struct ipv6hdr)); |
|
goto emsgsize; |
|
} |
|
|
|
if (ip6_sk_ignore_df(sk)) |
|
maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN; |
|
else |
|
maxnonfragsize = mtu; |
|
|
|
if (cork->length + length > maxnonfragsize - headersize) { |
|
emsgsize: |
|
pmtu = max_t(int, mtu - headersize + sizeof(struct ipv6hdr), 0); |
|
ipv6_local_error(sk, EMSGSIZE, fl6, pmtu); |
|
return -EMSGSIZE; |
|
} |
|
|
|
/* CHECKSUM_PARTIAL only with no extension headers and when |
|
* we are not going to fragment |
|
*/ |
|
if (transhdrlen && sk->sk_protocol == IPPROTO_UDP && |
|
headersize == sizeof(struct ipv6hdr) && |
|
length <= mtu - headersize && |
|
(!(flags & MSG_MORE) || cork->gso_size) && |
|
rt->dst.dev->features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) |
|
csummode = CHECKSUM_PARTIAL; |
|
|
|
if (flags & MSG_ZEROCOPY && length && sock_flag(sk, SOCK_ZEROCOPY)) { |
|
uarg = msg_zerocopy_realloc(sk, length, skb_zcopy(skb)); |
|
if (!uarg) |
|
return -ENOBUFS; |
|
extra_uref = !skb_zcopy(skb); /* only ref on new uarg */ |
|
if (rt->dst.dev->features & NETIF_F_SG && |
|
csummode == CHECKSUM_PARTIAL) { |
|
paged = true; |
|
} else { |
|
uarg->zerocopy = 0; |
|
skb_zcopy_set(skb, uarg, &extra_uref); |
|
} |
|
} |
|
|
|
/* |
|
* Let's try using as much space as possible. |
|
* Use MTU if total length of the message fits into the MTU. |
|
* Otherwise, we need to reserve fragment header and |
|
* fragment alignment (= 8-15 octects, in total). |
|
* |
|
* Note that we may need to "move" the data from the tail |
|
* of the buffer to the new fragment when we split |
|
* the message. |
|
* |
|
* FIXME: It may be fragmented into multiple chunks |
|
* at once if non-fragmentable extension headers |
|
* are too large. |
|
* --yoshfuji |
|
*/ |
|
|
|
cork->length += length; |
|
if (!skb) |
|
goto alloc_new_skb; |
|
|
|
while (length > 0) { |
|
/* Check if the remaining data fits into current packet. */ |
|
copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
|
if (copy < length) |
|
copy = maxfraglen - skb->len; |
|
|
|
if (copy <= 0) { |
|
char *data; |
|
unsigned int datalen; |
|
unsigned int fraglen; |
|
unsigned int fraggap; |
|
unsigned int alloclen, alloc_extra; |
|
unsigned int pagedlen; |
|
alloc_new_skb: |
|
/* There's no room in the current skb */ |
|
if (skb) |
|
fraggap = skb->len - maxfraglen; |
|
else |
|
fraggap = 0; |
|
/* update mtu and maxfraglen if necessary */ |
|
if (!skb || !skb_prev) |
|
ip6_append_data_mtu(&mtu, &maxfraglen, |
|
fragheaderlen, skb, rt, |
|
orig_mtu); |
|
|
|
skb_prev = skb; |
|
|
|
/* |
|
* If remaining data exceeds the mtu, |
|
* we know we need more fragment(s). |
|
*/ |
|
datalen = length + fraggap; |
|
|
|
if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
|
datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; |
|
fraglen = datalen + fragheaderlen; |
|
pagedlen = 0; |
|
|
|
alloc_extra = hh_len; |
|
alloc_extra += dst_exthdrlen; |
|
alloc_extra += rt->dst.trailer_len; |
|
|
|
/* We just reserve space for fragment header. |
|
* Note: this may be overallocation if the message |
|
* (without MSG_MORE) fits into the MTU. |
|
*/ |
|
alloc_extra += sizeof(struct frag_hdr); |
|
|
|
if ((flags & MSG_MORE) && |
|
!(rt->dst.dev->features&NETIF_F_SG)) |
|
alloclen = mtu; |
|
else if (!paged && |
|
(fraglen + alloc_extra < SKB_MAX_ALLOC || |
|
!(rt->dst.dev->features & NETIF_F_SG))) |
|
alloclen = fraglen; |
|
else { |
|
alloclen = min_t(int, fraglen, MAX_HEADER); |
|
pagedlen = fraglen - alloclen; |
|
} |
|
alloclen += alloc_extra; |
|
|
|
if (datalen != length + fraggap) { |
|
/* |
|
* this is not the last fragment, the trailer |
|
* space is regarded as data space. |
|
*/ |
|
datalen += rt->dst.trailer_len; |
|
} |
|
|
|
fraglen = datalen + fragheaderlen; |
|
|
|
copy = datalen - transhdrlen - fraggap - pagedlen; |
|
if (copy < 0) { |
|
err = -EINVAL; |
|
goto error; |
|
} |
|
if (transhdrlen) { |
|
skb = sock_alloc_send_skb(sk, alloclen, |
|
(flags & MSG_DONTWAIT), &err); |
|
} else { |
|
skb = NULL; |
|
if (refcount_read(&sk->sk_wmem_alloc) + wmem_alloc_delta <= |
|
2 * sk->sk_sndbuf) |
|
skb = alloc_skb(alloclen, |
|
sk->sk_allocation); |
|
if (unlikely(!skb)) |
|
err = -ENOBUFS; |
|
} |
|
if (!skb) |
|
goto error; |
|
/* |
|
* Fill in the control structures |
|
*/ |
|
skb->protocol = htons(ETH_P_IPV6); |
|
skb->ip_summed = csummode; |
|
skb->csum = 0; |
|
/* reserve for fragmentation and ipsec header */ |
|
skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + |
|
dst_exthdrlen); |
|
|
|
/* |
|
* Find where to start putting bytes |
|
*/ |
|
data = skb_put(skb, fraglen - pagedlen); |
|
skb_set_network_header(skb, exthdrlen); |
|
data += fragheaderlen; |
|
skb->transport_header = (skb->network_header + |
|
fragheaderlen); |
|
if (fraggap) { |
|
skb->csum = skb_copy_and_csum_bits( |
|
skb_prev, maxfraglen, |
|
data + transhdrlen, fraggap); |
|
skb_prev->csum = csum_sub(skb_prev->csum, |
|
skb->csum); |
|
data += fraggap; |
|
pskb_trim_unique(skb_prev, maxfraglen); |
|
} |
|
if (copy > 0 && |
|
getfrag(from, data + transhdrlen, offset, |
|
copy, fraggap, skb) < 0) { |
|
err = -EFAULT; |
|
kfree_skb(skb); |
|
goto error; |
|
} |
|
|
|
offset += copy; |
|
length -= copy + transhdrlen; |
|
transhdrlen = 0; |
|
exthdrlen = 0; |
|
dst_exthdrlen = 0; |
|
|
|
/* Only the initial fragment is time stamped */ |
|
skb_shinfo(skb)->tx_flags = cork->tx_flags; |
|
cork->tx_flags = 0; |
|
skb_shinfo(skb)->tskey = tskey; |
|
tskey = 0; |
|
skb_zcopy_set(skb, uarg, &extra_uref); |
|
|
|
if ((flags & MSG_CONFIRM) && !skb_prev) |
|
skb_set_dst_pending_confirm(skb, 1); |
|
|
|
/* |
|
* Put the packet on the pending queue |
|
*/ |
|
if (!skb->destructor) { |
|
skb->destructor = sock_wfree; |
|
skb->sk = sk; |
|
wmem_alloc_delta += skb->truesize; |
|
} |
|
__skb_queue_tail(queue, skb); |
|
continue; |
|
} |
|
|
|
if (copy > length) |
|
copy = length; |
|
|
|
if (!(rt->dst.dev->features&NETIF_F_SG) && |
|
skb_tailroom(skb) >= copy) { |
|
unsigned int off; |
|
|
|
off = skb->len; |
|
if (getfrag(from, skb_put(skb, copy), |
|
offset, copy, off, skb) < 0) { |
|
__skb_trim(skb, off); |
|
err = -EFAULT; |
|
goto error; |
|
} |
|
} else if (!uarg || !uarg->zerocopy) { |
|
int i = skb_shinfo(skb)->nr_frags; |
|
|
|
err = -ENOMEM; |
|
if (!sk_page_frag_refill(sk, pfrag)) |
|
goto error; |
|
|
|
if (!skb_can_coalesce(skb, i, pfrag->page, |
|
pfrag->offset)) { |
|
err = -EMSGSIZE; |
|
if (i == MAX_SKB_FRAGS) |
|
goto error; |
|
|
|
__skb_fill_page_desc(skb, i, pfrag->page, |
|
pfrag->offset, 0); |
|
skb_shinfo(skb)->nr_frags = ++i; |
|
get_page(pfrag->page); |
|
} |
|
copy = min_t(int, copy, pfrag->size - pfrag->offset); |
|
if (getfrag(from, |
|
page_address(pfrag->page) + pfrag->offset, |
|
offset, copy, skb->len, skb) < 0) |
|
goto error_efault; |
|
|
|
pfrag->offset += copy; |
|
skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); |
|
skb->len += copy; |
|
skb->data_len += copy; |
|
skb->truesize += copy; |
|
wmem_alloc_delta += copy; |
|
} else { |
|
err = skb_zerocopy_iter_dgram(skb, from, copy); |
|
if (err < 0) |
|
goto error; |
|
} |
|
offset += copy; |
|
length -= copy; |
|
} |
|
|
|
if (wmem_alloc_delta) |
|
refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc); |
|
return 0; |
|
|
|
error_efault: |
|
err = -EFAULT; |
|
error: |
|
net_zcopy_put_abort(uarg, extra_uref); |
|
cork->length -= length; |
|
IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
|
refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc); |
|
return err; |
|
} |
|
|
|
int ip6_append_data(struct sock *sk, |
|
int getfrag(void *from, char *to, int offset, int len, |
|
int odd, struct sk_buff *skb), |
|
void *from, int length, int transhdrlen, |
|
struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
|
struct rt6_info *rt, unsigned int flags) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
int exthdrlen; |
|
int err; |
|
|
|
if (flags&MSG_PROBE) |
|
return 0; |
|
if (skb_queue_empty(&sk->sk_write_queue)) { |
|
/* |
|
* setup for corking |
|
*/ |
|
err = ip6_setup_cork(sk, &inet->cork, &np->cork, |
|
ipc6, rt, fl6); |
|
if (err) |
|
return err; |
|
|
|
exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
|
length += exthdrlen; |
|
transhdrlen += exthdrlen; |
|
} else { |
|
fl6 = &inet->cork.fl.u.ip6; |
|
transhdrlen = 0; |
|
} |
|
|
|
return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base, |
|
&np->cork, sk_page_frag(sk), getfrag, |
|
from, length, transhdrlen, flags, ipc6); |
|
} |
|
EXPORT_SYMBOL_GPL(ip6_append_data); |
|
|
|
static void ip6_cork_release(struct inet_cork_full *cork, |
|
struct inet6_cork *v6_cork) |
|
{ |
|
if (v6_cork->opt) { |
|
kfree(v6_cork->opt->dst0opt); |
|
kfree(v6_cork->opt->dst1opt); |
|
kfree(v6_cork->opt->hopopt); |
|
kfree(v6_cork->opt->srcrt); |
|
kfree(v6_cork->opt); |
|
v6_cork->opt = NULL; |
|
} |
|
|
|
if (cork->base.dst) { |
|
dst_release(cork->base.dst); |
|
cork->base.dst = NULL; |
|
cork->base.flags &= ~IPCORK_ALLFRAG; |
|
} |
|
memset(&cork->fl, 0, sizeof(cork->fl)); |
|
} |
|
|
|
struct sk_buff *__ip6_make_skb(struct sock *sk, |
|
struct sk_buff_head *queue, |
|
struct inet_cork_full *cork, |
|
struct inet6_cork *v6_cork) |
|
{ |
|
struct sk_buff *skb, *tmp_skb; |
|
struct sk_buff **tail_skb; |
|
struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct net *net = sock_net(sk); |
|
struct ipv6hdr *hdr; |
|
struct ipv6_txoptions *opt = v6_cork->opt; |
|
struct rt6_info *rt = (struct rt6_info *)cork->base.dst; |
|
struct flowi6 *fl6 = &cork->fl.u.ip6; |
|
unsigned char proto = fl6->flowi6_proto; |
|
|
|
skb = __skb_dequeue(queue); |
|
if (!skb) |
|
goto out; |
|
tail_skb = &(skb_shinfo(skb)->frag_list); |
|
|
|
/* move skb->data to ip header from ext header */ |
|
if (skb->data < skb_network_header(skb)) |
|
__skb_pull(skb, skb_network_offset(skb)); |
|
while ((tmp_skb = __skb_dequeue(queue)) != NULL) { |
|
__skb_pull(tmp_skb, skb_network_header_len(skb)); |
|
*tail_skb = tmp_skb; |
|
tail_skb = &(tmp_skb->next); |
|
skb->len += tmp_skb->len; |
|
skb->data_len += tmp_skb->len; |
|
skb->truesize += tmp_skb->truesize; |
|
tmp_skb->destructor = NULL; |
|
tmp_skb->sk = NULL; |
|
} |
|
|
|
/* Allow local fragmentation. */ |
|
skb->ignore_df = ip6_sk_ignore_df(sk); |
|
|
|
*final_dst = fl6->daddr; |
|
__skb_pull(skb, skb_network_header_len(skb)); |
|
if (opt && opt->opt_flen) |
|
ipv6_push_frag_opts(skb, opt, &proto); |
|
if (opt && opt->opt_nflen) |
|
ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst, &fl6->saddr); |
|
|
|
skb_push(skb, sizeof(struct ipv6hdr)); |
|
skb_reset_network_header(skb); |
|
hdr = ipv6_hdr(skb); |
|
|
|
ip6_flow_hdr(hdr, v6_cork->tclass, |
|
ip6_make_flowlabel(net, skb, fl6->flowlabel, |
|
ip6_autoflowlabel(net, np), fl6)); |
|
hdr->hop_limit = v6_cork->hop_limit; |
|
hdr->nexthdr = proto; |
|
hdr->saddr = fl6->saddr; |
|
hdr->daddr = *final_dst; |
|
|
|
skb->priority = sk->sk_priority; |
|
skb->mark = cork->base.mark; |
|
|
|
skb->tstamp = cork->base.transmit_time; |
|
|
|
skb_dst_set(skb, dst_clone(&rt->dst)); |
|
IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
|
if (proto == IPPROTO_ICMPV6) { |
|
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
|
|
|
ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type); |
|
ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
|
} |
|
|
|
ip6_cork_release(cork, v6_cork); |
|
out: |
|
return skb; |
|
} |
|
|
|
int ip6_send_skb(struct sk_buff *skb) |
|
{ |
|
struct net *net = sock_net(skb->sk); |
|
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
|
int err; |
|
|
|
err = ip6_local_out(net, skb->sk, skb); |
|
if (err) { |
|
if (err > 0) |
|
err = net_xmit_errno(err); |
|
if (err) |
|
IP6_INC_STATS(net, rt->rt6i_idev, |
|
IPSTATS_MIB_OUTDISCARDS); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
int ip6_push_pending_frames(struct sock *sk) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
skb = ip6_finish_skb(sk); |
|
if (!skb) |
|
return 0; |
|
|
|
return ip6_send_skb(skb); |
|
} |
|
EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
|
|
|
static void __ip6_flush_pending_frames(struct sock *sk, |
|
struct sk_buff_head *queue, |
|
struct inet_cork_full *cork, |
|
struct inet6_cork *v6_cork) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
while ((skb = __skb_dequeue_tail(queue)) != NULL) { |
|
if (skb_dst(skb)) |
|
IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), |
|
IPSTATS_MIB_OUTDISCARDS); |
|
kfree_skb(skb); |
|
} |
|
|
|
ip6_cork_release(cork, v6_cork); |
|
} |
|
|
|
void ip6_flush_pending_frames(struct sock *sk) |
|
{ |
|
__ip6_flush_pending_frames(sk, &sk->sk_write_queue, |
|
&inet_sk(sk)->cork, &inet6_sk(sk)->cork); |
|
} |
|
EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |
|
|
|
struct sk_buff *ip6_make_skb(struct sock *sk, |
|
int getfrag(void *from, char *to, int offset, |
|
int len, int odd, struct sk_buff *skb), |
|
void *from, int length, int transhdrlen, |
|
struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
|
struct rt6_info *rt, unsigned int flags, |
|
struct inet_cork_full *cork) |
|
{ |
|
struct inet6_cork v6_cork; |
|
struct sk_buff_head queue; |
|
int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0); |
|
int err; |
|
|
|
if (flags & MSG_PROBE) |
|
return NULL; |
|
|
|
__skb_queue_head_init(&queue); |
|
|
|
cork->base.flags = 0; |
|
cork->base.addr = 0; |
|
cork->base.opt = NULL; |
|
cork->base.dst = NULL; |
|
v6_cork.opt = NULL; |
|
err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt, fl6); |
|
if (err) { |
|
ip6_cork_release(cork, &v6_cork); |
|
return ERR_PTR(err); |
|
} |
|
if (ipc6->dontfrag < 0) |
|
ipc6->dontfrag = inet6_sk(sk)->dontfrag; |
|
|
|
err = __ip6_append_data(sk, fl6, &queue, &cork->base, &v6_cork, |
|
¤t->task_frag, getfrag, from, |
|
length + exthdrlen, transhdrlen + exthdrlen, |
|
flags, ipc6); |
|
if (err) { |
|
__ip6_flush_pending_frames(sk, &queue, cork, &v6_cork); |
|
return ERR_PTR(err); |
|
} |
|
|
|
return __ip6_make_skb(sk, &queue, cork, &v6_cork); |
|
}
|
|
|