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Message-Id: <20170925032941.14586-2-tom@quantonium.net>
Date: Sun, 24 Sep 2017 20:29:30 -0700
From: Tom Herbert <tom@...ntonium.net>
To: davem@...emloft.net
Cc: pablo@...filter.org, laforge@...monks.org, aschultz@...p.net,
netdev@...r.kernel.org, rohit@...ntonium.net,
Tom Herbert <tom@...ntonium.net>
Subject: [PATCH v3 net-next 01/12] iptunnel: Add common functions to get a tunnel route
ip_tunnel_get_route and ip6_tnl_get_route are created to return
routes for a tunnel. These functions are derived from the VXLAN
functions.
Signed-off-by: Tom Herbert <tom@...ntonium.net>
---
include/net/ip6_tunnel.h | 35 +++++++++++++++++++++++++++++++++++
include/net/ip_tunnels.h | 33 +++++++++++++++++++++++++++++++++
net/ipv4/ip_tunnel.c | 41 +++++++++++++++++++++++++++++++++++++++++
net/ipv6/ip6_tunnel.c | 43 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 152 insertions(+)
diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
index 08fbc7f7d8d7..5a67301b0416 100644
--- a/include/net/ip6_tunnel.h
+++ b/include/net/ip6_tunnel.h
@@ -142,6 +142,41 @@ __u32 ip6_tnl_get_cap(struct ip6_tnl *t, const struct in6_addr *laddr,
struct net *ip6_tnl_get_link_net(const struct net_device *dev);
int ip6_tnl_get_iflink(const struct net_device *dev);
int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu);
+struct dst_entry *__ip6_tnl_get_route(struct net_device *dev,
+ struct sk_buff *skb, struct sock *sk,
+ u8 proto, int oif, u8 tos, __be32 label,
+ const struct in6_addr *daddr,
+ struct in6_addr *saddr,
+ __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info,
+ bool use_cache);
+
+static inline struct dst_entry *ip6_tnl_get_route(struct net_device *dev,
+ struct sk_buff *skb, struct sock *sk, u8 proto,
+ int oif, u8 tos, __be32 label,
+ const struct in6_addr *daddr,
+ struct in6_addr *saddr,
+ __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info)
+{
+ bool use_cache = (ip_tunnel_dst_cache_usable(skb, info) &&
+ (!tos || info));
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (use_cache) {
+ struct dst_entry *ndst = dst_cache_get_ip6(dst_cache, saddr);
+
+ if (ndst)
+ return ndst;
+ }
+#endif
+
+ return __ip6_tnl_get_route(dev, skb, sk, proto, oif, tos, label,
+ daddr, saddr, dport, sport, dst_cache,
+ info, use_cache);
+}
static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
struct net_device *dev)
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index b41a1e057fce..9650efff33d7 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -285,6 +285,39 @@ int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
struct ip_tunnel_parm *p, __u32 fwmark);
void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
+struct rtable *__ip_tunnel_get_route(struct net_device *dev,
+ struct sk_buff *skb, u8 proto,
+ int oif, u8 tos,
+ __be32 daddr, __be32 *saddr,
+ __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info,
+ bool use_cache);
+
+static inline struct rtable *ip_tunnel_get_route(struct net_device *dev,
+ struct sk_buff *skb, u8 proto,
+ int oif, u8 tos,
+ __be32 daddr, __be32 *saddr,
+ __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info)
+{
+ bool use_cache = (ip_tunnel_dst_cache_usable(skb, info) &&
+ (!tos || info));
+
+ if (use_cache) {
+ struct rtable *rt;
+
+ rt = dst_cache_get_ip4(dst_cache, saddr);
+ if (rt)
+ return rt;
+ }
+
+ return __ip_tunnel_get_route(dev, skb, proto, oif, tos,
+ daddr, saddr, dport, sport,
+ dst_cache, info, use_cache);
+}
+
struct ip_tunnel_encap_ops {
size_t (*encap_hlen)(struct ip_tunnel_encap *e);
int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index fe6fee728ce4..ea8f8bc0aaf9 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -935,6 +935,47 @@ int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
}
EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
+struct rtable *__ip_tunnel_get_route(struct net_device *dev,
+ struct sk_buff *skb, u8 proto,
+ int oif, u8 tos,
+ __be32 daddr, __be32 *saddr,
+ __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info,
+ bool use_cache)
+{
+ struct rtable *rt = NULL;
+ struct flowi4 fl4;
+
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.flowi4_oif = oif;
+ fl4.flowi4_tos = RT_TOS(tos);
+ fl4.flowi4_mark = skb->mark;
+ fl4.flowi4_proto = proto;
+ fl4.daddr = daddr;
+ fl4.saddr = *saddr;
+ fl4.fl4_dport = dport;
+ fl4.fl4_sport = sport;
+
+ rt = ip_route_output_key(dev_net(dev), &fl4);
+ if (likely(!IS_ERR(rt))) {
+ if (rt->dst.dev == dev) {
+ netdev_dbg(dev, "circular route to %pI4\n", &daddr);
+ ip_rt_put(rt);
+ return ERR_PTR(-ELOOP);
+ }
+
+ *saddr = fl4.saddr;
+ if (use_cache)
+ dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
+ } else {
+ netdev_dbg(dev, "no route to %pI4\n", &daddr);
+ return ERR_PTR(-ENETUNREACH);
+ }
+ return rt;
+}
+EXPORT_SYMBOL_GPL(__ip_tunnel_get_route);
+
int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 3d6df489b39f..a541daea1379 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1663,6 +1663,49 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
return err;
}
+struct dst_entry *__ip6_tnl_get_route(struct net_device *dev,
+ struct sk_buff *skb, struct sock *sk,
+ u8 proto, int oif, u8 tos, __be32 label,
+ const struct in6_addr *daddr,
+ struct in6_addr *saddr,
+ __be16 dport, __be16 sport,
+ struct dst_cache *dst_cache,
+ const struct ip_tunnel_info *info,
+ bool use_cache)
+{
+ struct dst_entry *ndst;
+ struct flowi6 fl6;
+ int err;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = oif;
+ fl6.daddr = *daddr;
+ fl6.saddr = *saddr;
+ fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
+ fl6.flowi6_mark = skb->mark;
+ fl6.flowi6_proto = proto;
+ fl6.fl6_dport = dport;
+ fl6.fl6_sport = sport;
+
+ err = ipv6_stub->ipv6_dst_lookup(dev_net(dev), sk, &ndst, &fl6);
+ if (unlikely(err < 0)) {
+ netdev_dbg(dev, "no route to %pI6\n", daddr);
+ return ERR_PTR(-ENETUNREACH);
+ }
+
+ if (unlikely(ndst->dev == dev)) {
+ netdev_dbg(dev, "circular route to %pI6\n", daddr);
+ dst_release(ndst);
+ return ERR_PTR(-ELOOP);
+ }
+
+ *saddr = fl6.saddr;
+ if (use_cache)
+ dst_cache_set_ip6(dst_cache, ndst, saddr);
+ return ndst;
+}
+EXPORT_SYMBOL_GPL(__ip6_tnl_get_route);
+
/**
* ip6_tnl_change_mtu - change mtu manually for tunnel device
* @dev: virtual device associated with tunnel
--
2.11.0
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