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vxlan: use generic function for tunnel IPv4 route lookup
The route lookup can be done now via generic function udp_tunnel_dst_lookup() to replace the custom implementations in vxlan_get_route(). Note that this patch only touches IPv4, while IPv6 still uses vxlan6_get_route(). After IPv6 route lookup gets converted as well, vxlan_xmit_one() can be simplified by removing local variables that will be passed via "struct ip_tunnel_key", such as remote_ip, local_ip, flow_flags, label. Suggested-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: Beniamino Galvani <b.galvani@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Beniamino Galvani
David S. Miller
parent
daa2ba7ed1
commit
6f19b2c136
@ -2215,57 +2215,6 @@ static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
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return 0;
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}
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static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
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struct vxlan_sock *sock4,
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struct sk_buff *skb, int oif, u8 tos,
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__be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
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__u8 flow_flags, struct dst_cache *dst_cache,
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const struct ip_tunnel_info *info)
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{
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bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
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struct rtable *rt = NULL;
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struct flowi4 fl4;
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if (!sock4)
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return ERR_PTR(-EIO);
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if (tos && !info)
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use_cache = false;
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if (use_cache) {
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rt = dst_cache_get_ip4(dst_cache, saddr);
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if (rt)
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return rt;
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}
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memset(&fl4, 0, sizeof(fl4));
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fl4.flowi4_oif = oif;
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fl4.flowi4_tos = RT_TOS(tos);
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fl4.flowi4_mark = skb->mark;
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fl4.flowi4_proto = IPPROTO_UDP;
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fl4.daddr = daddr;
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fl4.saddr = *saddr;
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fl4.fl4_dport = dport;
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fl4.fl4_sport = sport;
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fl4.flowi4_flags = flow_flags;
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rt = ip_route_output_key(vxlan->net, &fl4);
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if (!IS_ERR(rt)) {
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if (rt->dst.dev == dev) {
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netdev_dbg(dev, "circular route to %pI4\n", &daddr);
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ip_rt_put(rt);
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return ERR_PTR(-ELOOP);
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}
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*saddr = fl4.saddr;
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if (use_cache)
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dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
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} else {
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netdev_dbg(dev, "no route to %pI4\n", &daddr);
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return ERR_PTR(-ENETUNREACH);
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}
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return rt;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
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struct net_device *dev,
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@ -2418,30 +2367,38 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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{
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struct dst_cache *dst_cache;
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struct ip_tunnel_info *info;
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struct ip_tunnel_key *pkey;
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struct ip_tunnel_key key;
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struct vxlan_dev *vxlan = netdev_priv(dev);
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const struct iphdr *old_iph = ip_hdr(skb);
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union vxlan_addr *dst;
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union vxlan_addr remote_ip, local_ip;
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union vxlan_addr remote_ip;
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struct vxlan_metadata _md;
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struct vxlan_metadata *md = &_md;
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unsigned int pkt_len = skb->len;
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__be16 src_port = 0, dst_port;
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struct dst_entry *ndst = NULL;
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__u8 tos, ttl, flow_flags = 0;
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__u8 tos, ttl;
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int ifindex;
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int err;
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u32 flags = vxlan->cfg.flags;
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bool use_cache;
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bool udp_sum = false;
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bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
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__be32 vni = 0;
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#if IS_ENABLED(CONFIG_IPV6)
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union vxlan_addr local_ip;
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__be32 label;
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#endif
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info = skb_tunnel_info(skb);
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use_cache = ip_tunnel_dst_cache_usable(skb, info);
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if (rdst) {
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dst = &rdst->remote_ip;
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memset(&key, 0, sizeof(key));
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pkey = &key;
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if (vxlan_addr_any(dst)) {
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if (did_rsc) {
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/* short-circuited back to local bridge */
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@ -2455,7 +2412,15 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
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vni = (rdst->remote_vni) ? : default_vni;
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ifindex = rdst->remote_ifindex;
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local_ip = vxlan->cfg.saddr;
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if (dst->sa.sa_family == AF_INET) {
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key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr;
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key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr;
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} else {
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key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr;
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key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr;
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}
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dst_cache = &rdst->dst_cache;
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md->gbp = skb->mark;
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if (flags & VXLAN_F_TTL_INHERIT) {
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@ -2469,12 +2434,15 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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tos = vxlan->cfg.tos;
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if (tos == 1)
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tos = ip_tunnel_get_dsfield(old_iph, skb);
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if (tos && !info)
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use_cache = false;
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if (dst->sa.sa_family == AF_INET)
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udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
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else
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udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
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#if IS_ENABLED(CONFIG_IPV6)
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local_ip = vxlan->cfg.saddr;
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label = vxlan->cfg.label;
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#endif
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} else {
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@ -2486,14 +2454,15 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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remote_ip.sa.sa_family = ip_tunnel_info_af(info);
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if (remote_ip.sa.sa_family == AF_INET) {
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remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
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local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
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} else {
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remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
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#if IS_ENABLED(CONFIG_IPV6)
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local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
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#endif
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}
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dst = &remote_ip;
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pkey = &info->key;
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dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
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flow_flags = info->key.flow_flags;
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vni = tunnel_id_to_key32(info->key.tun_id);
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ifindex = 0;
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dst_cache = &info->dst_cache;
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@ -2517,15 +2486,14 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
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struct rtable *rt;
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__be16 df = 0;
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__be32 saddr;
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if (!ifindex)
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ifindex = sock4->sock->sk->sk_bound_dev_if;
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rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
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dst->sin.sin_addr.s_addr,
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&local_ip.sin.sin_addr.s_addr,
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dst_port, src_port, flow_flags,
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dst_cache, info);
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rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex,
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&saddr, pkey, src_port, dst_port,
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tos, use_cache ? dst_cache : NULL);
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if (IS_ERR(rt)) {
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err = PTR_ERR(rt);
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goto tx_error;
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@ -2561,16 +2529,13 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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} else if (err) {
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if (info) {
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struct ip_tunnel_info *unclone;
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struct in_addr src, dst;
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unclone = skb_tunnel_info_unclone(skb);
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if (unlikely(!unclone))
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goto tx_error;
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src = remote_ip.sin.sin_addr;
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dst = local_ip.sin.sin_addr;
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unclone->key.u.ipv4.src = src.s_addr;
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unclone->key.u.ipv4.dst = dst.s_addr;
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unclone->key.u.ipv4.src = pkey->u.ipv4.dst;
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unclone->key.u.ipv4.dst = saddr;
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}
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vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
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dst_release(ndst);
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@ -2584,8 +2549,8 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
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if (err < 0)
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goto tx_error;
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udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
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dst->sin.sin_addr.s_addr, tos, ttl, df,
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udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr,
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pkey->u.ipv4.dst, tos, ttl, df,
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src_port, dst_port, xnet, !udp_sum);
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#if IS_ENABLED(CONFIG_IPV6)
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} else {
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@ -3286,11 +3251,14 @@ static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
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struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
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struct rtable *rt;
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rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
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info->key.u.ipv4.dst,
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&info->key.u.ipv4.src, dport, sport,
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info->key.flow_flags, &info->dst_cache,
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info);
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if (!sock4)
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return -EIO;
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rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0,
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&info->key.u.ipv4.src,
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&info->key,
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sport, dport, info->key.tos,
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&info->dst_cache);
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if (IS_ERR(rt))
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return PTR_ERR(rt);
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ip_rt_put(rt);
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