diff options
| -rw-r--r-- | net/ipv6/ip6_tunnel.c | 143 |
1 files changed, 98 insertions, 45 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 985d106dff6d..4546bb923a20 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -678,9 +678,13 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) return ret; } /** - * ip6ip6_tnl_xmit - encapsulate packet and send + * ip6_tnl_xmit2 - encapsulate packet and send * @skb: the outgoing socket buffer * @dev: the outgoing tunnel device + * @dsfield: dscp code for outer header + * @fl: flow of tunneled packet + * @encap_limit: encapsulation limit + * @pmtu: Path MTU is stored if packet is too big * * Description: * Build new header and do some sanity checks on the packet before sending @@ -688,62 +692,35 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) * * Return: * 0 + * -1 fail + * %-EMSGSIZE message too big. return mtu in this case. **/ -static int -ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) +static int ip6_tnl_xmit2(struct sk_buff *skb, + struct net_device *dev, + __u8 dsfield, + struct flowi *fl, + int encap_limit, + __u32 *pmtu) { struct ip6_tnl *t = netdev_priv(dev); struct net_device_stats *stats = &t->stat; struct ipv6hdr *ipv6h = skb->nh.ipv6h; - int encap_limit = -1; struct ipv6_tel_txoption opt; - __u16 offset; - struct flowi fl; struct dst_entry *dst; struct net_device *tdev; int mtu; int max_headroom = sizeof(struct ipv6hdr); u8 proto; - int err; + int err = -1; int pkt_len; - int dsfield; - - if (t->recursion++) { - stats->collisions++; - goto tx_err; - } - if (skb->protocol != htons(ETH_P_IPV6) || - !ip6_tnl_xmit_ctl(t) || ip6ip6_tnl_addr_conflict(t, ipv6h)) - goto tx_err; - - if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) { - struct ipv6_tlv_tnl_enc_lim *tel; - tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset]; - if (tel->encap_limit == 0) { - icmpv6_send(skb, ICMPV6_PARAMPROB, - ICMPV6_HDR_FIELD, offset + 2, skb->dev); - goto tx_err; - } - encap_limit = tel->encap_limit - 1; - } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) - encap_limit = t->parms.encap_limit; - - memcpy(&fl, &t->fl, sizeof (fl)); - proto = fl.proto; - - dsfield = ipv6_get_dsfield(ipv6h); - if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) - fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); - if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) - fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); if ((dst = ip6_tnl_dst_check(t)) != NULL) dst_hold(dst); else { - dst = ip6_route_output(NULL, &fl); + dst = ip6_route_output(NULL, fl); - if (dst->error || xfrm_lookup(&dst, &fl, NULL, 0) < 0) + if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) goto tx_err_link_failure; } @@ -767,7 +744,8 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) if (skb->dst) skb->dst->ops->update_pmtu(skb->dst, mtu); if (skb->len > mtu) { - icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); + *pmtu = mtu; + err = -EMSGSIZE; goto tx_err_dst_release; } @@ -793,20 +771,21 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) skb->h.raw = skb->nh.raw; + proto = fl->proto; if (encap_limit >= 0) { init_tel_txopt(&opt, encap_limit); ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); } skb->nh.raw = skb_push(skb, sizeof(struct ipv6hdr)); ipv6h = skb->nh.ipv6h; - *(__be32*)ipv6h = fl.fl6_flowlabel | htonl(0x60000000); + *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); dsfield = INET_ECN_encapsulate(0, dsfield); ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); ipv6h->hop_limit = t->parms.hop_limit; ipv6h->nexthdr = proto; - ipv6_addr_copy(&ipv6h->saddr, &fl.fl6_src); - ipv6_addr_copy(&ipv6h->daddr, &fl.fl6_dst); + ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); + ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); nf_reset(skb); pkt_len = skb->len; err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, @@ -820,13 +799,87 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) stats->tx_aborted_errors++; } ip6_tnl_dst_store(t, dst); - t->recursion--; return 0; tx_err_link_failure: stats->tx_carrier_errors++; dst_link_failure(skb); tx_err_dst_release: dst_release(dst); + return err; +} + +static inline int +ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ip6_tnl *t = netdev_priv(dev); + struct ipv6hdr *ipv6h = skb->nh.ipv6h; + int encap_limit = -1; + __u16 offset; + struct flowi fl; + __u8 dsfield; + __u32 mtu; + int err; + + if (!ip6_tnl_xmit_ctl(t) || ip6ip6_tnl_addr_conflict(t, ipv6h)) + return -1; + + if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) { + struct ipv6_tlv_tnl_enc_lim *tel; + tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset]; + if (tel->encap_limit == 0) { + icmpv6_send(skb, ICMPV6_PARAMPROB, + ICMPV6_HDR_FIELD, offset + 2, skb->dev); + return -1; + } + encap_limit = tel->encap_limit - 1; + } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) + encap_limit = t->parms.encap_limit; + + memcpy(&fl, &t->fl, sizeof (fl)); + fl.proto = IPPROTO_IPV6; + + dsfield = ipv6_get_dsfield(ipv6h); + if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) + fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); + if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) + fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); + + err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); + if (err != 0) { + if (err == -EMSGSIZE) + icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); + return -1; + } + + return 0; +} + +static int +ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ip6_tnl *t = netdev_priv(dev); + struct net_device_stats *stats = &t->stat; + int ret; + + if (t->recursion++) { + t->stat.collisions++; + goto tx_err; + } + + switch (skb->protocol) { + case __constant_htons(ETH_P_IPV6): + ret = ip6ip6_tnl_xmit(skb, dev); + break; + default: + goto tx_err; + } + + if (ret < 0) + goto tx_err; + + t->recursion--; + return 0; + tx_err: stats->tx_errors++; stats->tx_dropped++; @@ -1088,7 +1141,7 @@ static void ip6ip6_tnl_dev_setup(struct net_device *dev) SET_MODULE_OWNER(dev); dev->uninit = ip6ip6_tnl_dev_uninit; dev->destructor = free_netdev; - dev->hard_start_xmit = ip6ip6_tnl_xmit; + dev->hard_start_xmit = ip6_tnl_xmit; dev->get_stats = ip6ip6_tnl_get_stats; dev->do_ioctl = ip6ip6_tnl_ioctl; dev->change_mtu = ip6ip6_tnl_change_mtu; |