[IPV6] IP6TUNNEL: Split out generic routine in ip6ip6_xmit().
This enables to add IPv4/IPv6 specific handling later, Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yasuyuki Kozakai
David S. Miller
parent
8359925be8
commit
61ec2aec28
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@ -678,9 +678,13 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
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return ret;
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}
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/**
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* ip6ip6_tnl_xmit - encapsulate packet and send
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* ip6_tnl_xmit2 - encapsulate packet and send
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* @skb: the outgoing socket buffer
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* @dev: the outgoing tunnel device
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* @dsfield: dscp code for outer header
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* @fl: flow of tunneled packet
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* @encap_limit: encapsulation limit
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* @pmtu: Path MTU is stored if packet is too big
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*
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* Description:
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* Build new header and do some sanity checks on the packet before sending
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@ -688,62 +692,35 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
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*
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* Return:
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* 0
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* -1 fail
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* %-EMSGSIZE message too big. return mtu in this case.
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**/
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static int
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ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
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static int ip6_tnl_xmit2(struct sk_buff *skb,
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struct net_device *dev,
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__u8 dsfield,
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struct flowi *fl,
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int encap_limit,
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__u32 *pmtu)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct net_device_stats *stats = &t->stat;
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struct ipv6hdr *ipv6h = skb->nh.ipv6h;
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int encap_limit = -1;
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struct ipv6_tel_txoption opt;
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__u16 offset;
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struct flowi fl;
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struct dst_entry *dst;
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struct net_device *tdev;
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int mtu;
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int max_headroom = sizeof(struct ipv6hdr);
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u8 proto;
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int err;
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int err = -1;
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int pkt_len;
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int dsfield;
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if (t->recursion++) {
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stats->collisions++;
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goto tx_err;
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}
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if (skb->protocol != htons(ETH_P_IPV6) ||
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!ip6_tnl_xmit_ctl(t) || ip6ip6_tnl_addr_conflict(t, ipv6h))
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goto tx_err;
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if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) {
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struct ipv6_tlv_tnl_enc_lim *tel;
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tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset];
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if (tel->encap_limit == 0) {
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icmpv6_send(skb, ICMPV6_PARAMPROB,
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ICMPV6_HDR_FIELD, offset + 2, skb->dev);
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goto tx_err;
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}
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encap_limit = tel->encap_limit - 1;
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} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
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encap_limit = t->parms.encap_limit;
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memcpy(&fl, &t->fl, sizeof (fl));
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proto = fl.proto;
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dsfield = ipv6_get_dsfield(ipv6h);
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if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
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fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
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if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
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fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
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if ((dst = ip6_tnl_dst_check(t)) != NULL)
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dst_hold(dst);
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else {
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dst = ip6_route_output(NULL, &fl);
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dst = ip6_route_output(NULL, fl);
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if (dst->error || xfrm_lookup(&dst, &fl, NULL, 0) < 0)
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if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0)
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goto tx_err_link_failure;
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}
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@ -767,7 +744,8 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
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if (skb->dst)
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skb->dst->ops->update_pmtu(skb->dst, mtu);
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if (skb->len > mtu) {
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icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
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*pmtu = mtu;
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err = -EMSGSIZE;
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goto tx_err_dst_release;
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}
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@ -793,20 +771,21 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
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skb->h.raw = skb->nh.raw;
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proto = fl->proto;
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if (encap_limit >= 0) {
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init_tel_txopt(&opt, encap_limit);
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ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
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}
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skb->nh.raw = skb_push(skb, sizeof(struct ipv6hdr));
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ipv6h = skb->nh.ipv6h;
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*(__be32*)ipv6h = fl.fl6_flowlabel | htonl(0x60000000);
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*(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000);
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dsfield = INET_ECN_encapsulate(0, dsfield);
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ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
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ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
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ipv6h->hop_limit = t->parms.hop_limit;
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ipv6h->nexthdr = proto;
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ipv6_addr_copy(&ipv6h->saddr, &fl.fl6_src);
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ipv6_addr_copy(&ipv6h->daddr, &fl.fl6_dst);
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ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src);
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ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst);
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nf_reset(skb);
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pkt_len = skb->len;
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err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL,
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@ -820,13 +799,87 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
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stats->tx_aborted_errors++;
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}
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ip6_tnl_dst_store(t, dst);
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t->recursion--;
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return 0;
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tx_err_link_failure:
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stats->tx_carrier_errors++;
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dst_link_failure(skb);
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tx_err_dst_release:
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dst_release(dst);
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return err;
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}
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static inline int
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ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct ipv6hdr *ipv6h = skb->nh.ipv6h;
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int encap_limit = -1;
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__u16 offset;
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struct flowi fl;
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__u8 dsfield;
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__u32 mtu;
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int err;
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if (!ip6_tnl_xmit_ctl(t) || ip6ip6_tnl_addr_conflict(t, ipv6h))
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return -1;
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if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) {
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struct ipv6_tlv_tnl_enc_lim *tel;
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tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset];
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if (tel->encap_limit == 0) {
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icmpv6_send(skb, ICMPV6_PARAMPROB,
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ICMPV6_HDR_FIELD, offset + 2, skb->dev);
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return -1;
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}
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encap_limit = tel->encap_limit - 1;
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} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
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encap_limit = t->parms.encap_limit;
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memcpy(&fl, &t->fl, sizeof (fl));
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fl.proto = IPPROTO_IPV6;
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dsfield = ipv6_get_dsfield(ipv6h);
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if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
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fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
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if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
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fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
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err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
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if (err != 0) {
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if (err == -EMSGSIZE)
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icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
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return -1;
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}
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return 0;
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}
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static int
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ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct net_device_stats *stats = &t->stat;
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int ret;
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if (t->recursion++) {
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t->stat.collisions++;
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goto tx_err;
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}
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switch (skb->protocol) {
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case __constant_htons(ETH_P_IPV6):
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ret = ip6ip6_tnl_xmit(skb, dev);
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break;
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default:
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goto tx_err;
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}
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if (ret < 0)
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goto tx_err;
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t->recursion--;
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return 0;
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tx_err:
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stats->tx_errors++;
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stats->tx_dropped++;
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@ -1088,7 +1141,7 @@ static void ip6ip6_tnl_dev_setup(struct net_device *dev)
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SET_MODULE_OWNER(dev);
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dev->uninit = ip6ip6_tnl_dev_uninit;
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dev->destructor = free_netdev;
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dev->hard_start_xmit = ip6ip6_tnl_xmit;
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dev->hard_start_xmit = ip6_tnl_xmit;
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dev->get_stats = ip6ip6_tnl_get_stats;
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dev->do_ioctl = ip6ip6_tnl_ioctl;
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dev->change_mtu = ip6ip6_tnl_change_mtu;
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