From 14909664e4e192f4c6f6fcdccd9919af7cf783ab Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Wed, 17 Sep 2014 12:25:59 -0700 Subject: [PATCH] sit: Setup and TX path for sit/UDP foo-over-udp encapsulation Added netlink handling of IP tunnel encapulation paramters, properly adjust MTU for encapsulation. Added ip_tunnel_encap call to ipip6_tunnel_xmit to actually perform FOU encapsulation. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- net/ipv6/sit.c | 107 ++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 97 insertions(+), 10 deletions(-) diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index 86e3fa81f85e..db75809ab843 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -822,6 +822,8 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, int addr_type; u8 ttl; int err; + u8 protocol = IPPROTO_IPV6; + int t_hlen = tunnel->hlen + sizeof(struct iphdr); if (skb->protocol != htons(ETH_P_IPV6)) goto tx_error; @@ -911,8 +913,14 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, goto tx_error; } + skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT); + if (IS_ERR(skb)) { + ip_rt_put(rt); + goto out; + } + if (df) { - mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); + mtu = dst_mtu(&rt->dst) - t_hlen; if (mtu < 68) { dev->stats.collisions++; @@ -947,7 +955,7 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, /* * Okay, now see if we can stuff it in the buffer as-is. */ - max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); + max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; if (skb_headroom(skb) < max_headroom || skb_shared(skb) || (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { @@ -969,14 +977,13 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, ttl = iph6->hop_limit; tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); - skb = iptunnel_handle_offloads(skb, false, SKB_GSO_SIT); - if (IS_ERR(skb)) { + if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { ip_rt_put(rt); - goto out; + goto tx_error; } err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr, - IPPROTO_IPV6, tos, ttl, df, + protocol, tos, ttl, df, !net_eq(tunnel->net, dev_net(dev))); iptunnel_xmit_stats(err, &dev->stats, dev->tstats); return NETDEV_TX_OK; @@ -1059,8 +1066,10 @@ static void ipip6_tunnel_bind_dev(struct net_device *dev) tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); if (tdev) { + int t_hlen = tunnel->hlen + sizeof(struct iphdr); + dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); - dev->mtu = tdev->mtu - sizeof(struct iphdr); + dev->mtu = tdev->mtu - t_hlen; if (dev->mtu < IPV6_MIN_MTU) dev->mtu = IPV6_MIN_MTU; } @@ -1307,7 +1316,10 @@ done: static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) { - if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) + struct ip_tunnel *tunnel = netdev_priv(dev); + int t_hlen = tunnel->hlen + sizeof(struct iphdr); + + if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - t_hlen) return -EINVAL; dev->mtu = new_mtu; return 0; @@ -1338,12 +1350,15 @@ static void ipip6_dev_free(struct net_device *dev) static void ipip6_tunnel_setup(struct net_device *dev) { + struct ip_tunnel *tunnel = netdev_priv(dev); + int t_hlen = tunnel->hlen + sizeof(struct iphdr); + dev->netdev_ops = &ipip6_netdev_ops; dev->destructor = ipip6_dev_free; dev->type = ARPHRD_SIT; - dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); - dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); + dev->hard_header_len = LL_MAX_HEADER + t_hlen; + dev->mtu = ETH_DATA_LEN - t_hlen; dev->flags = IFF_NOARP; dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; dev->iflink = 0; @@ -1466,6 +1481,40 @@ static void ipip6_netlink_parms(struct nlattr *data[], } +/* This function returns true when ENCAP attributes are present in the nl msg */ +static bool ipip6_netlink_encap_parms(struct nlattr *data[], + struct ip_tunnel_encap *ipencap) +{ + bool ret = false; + + memset(ipencap, 0, sizeof(*ipencap)); + + if (!data) + return ret; + + if (data[IFLA_IPTUN_ENCAP_TYPE]) { + ret = true; + ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); + } + + if (data[IFLA_IPTUN_ENCAP_FLAGS]) { + ret = true; + ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); + } + + if (data[IFLA_IPTUN_ENCAP_SPORT]) { + ret = true; + ipencap->sport = nla_get_u16(data[IFLA_IPTUN_ENCAP_SPORT]); + } + + if (data[IFLA_IPTUN_ENCAP_DPORT]) { + ret = true; + ipencap->dport = nla_get_u16(data[IFLA_IPTUN_ENCAP_DPORT]); + } + + return ret; +} + #ifdef CONFIG_IPV6_SIT_6RD /* This function returns true when 6RD attributes are present in the nl msg */ static bool ipip6_netlink_6rd_parms(struct nlattr *data[], @@ -1509,12 +1558,20 @@ static int ipip6_newlink(struct net *src_net, struct net_device *dev, { struct net *net = dev_net(dev); struct ip_tunnel *nt; + struct ip_tunnel_encap ipencap; #ifdef CONFIG_IPV6_SIT_6RD struct ip_tunnel_6rd ip6rd; #endif int err; nt = netdev_priv(dev); + + if (ipip6_netlink_encap_parms(data, &ipencap)) { + err = ip_tunnel_encap_setup(nt, &ipencap); + if (err < 0) + return err; + } + ipip6_netlink_parms(data, &nt->parms); if (ipip6_tunnel_locate(net, &nt->parms, 0)) @@ -1537,15 +1594,23 @@ static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], { struct ip_tunnel *t = netdev_priv(dev); struct ip_tunnel_parm p; + struct ip_tunnel_encap ipencap; struct net *net = t->net; struct sit_net *sitn = net_generic(net, sit_net_id); #ifdef CONFIG_IPV6_SIT_6RD struct ip_tunnel_6rd ip6rd; #endif + int err; if (dev == sitn->fb_tunnel_dev) return -EINVAL; + if (ipip6_netlink_encap_parms(data, &ipencap)) { + err = ip_tunnel_encap_setup(t, &ipencap); + if (err < 0) + return err; + } + ipip6_netlink_parms(data, &p); if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || @@ -1599,6 +1664,14 @@ static size_t ipip6_get_size(const struct net_device *dev) /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ nla_total_size(2) + #endif + /* IFLA_IPTUN_ENCAP_TYPE */ + nla_total_size(2) + + /* IFLA_IPTUN_ENCAP_FLAGS */ + nla_total_size(2) + + /* IFLA_IPTUN_ENCAP_SPORT */ + nla_total_size(2) + + /* IFLA_IPTUN_ENCAP_DPORT */ + nla_total_size(2) + 0; } @@ -1630,6 +1703,16 @@ static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) goto nla_put_failure; #endif + if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, + tunnel->encap.type) || + nla_put_u16(skb, IFLA_IPTUN_ENCAP_SPORT, + tunnel->encap.sport) || + nla_put_u16(skb, IFLA_IPTUN_ENCAP_DPORT, + tunnel->encap.dport) || + nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, + tunnel->encap.dport)) + goto nla_put_failure; + return 0; nla_put_failure: @@ -1651,6 +1734,10 @@ static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, #endif + [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, + [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, + [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, + [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, }; static void ipip6_dellink(struct net_device *dev, struct list_head *head) -- 2.20.1