Re: [PATCH 4/4] udp_tunnel: Pass UDP socket down through udp_tunnel{,6}_xmit_skb().

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On Sun, Apr 5, 2015 at 7:19 PM, David Miller <davem@xxxxxxxxxxxxx> wrote:
>
> That was we can make sure the output path of ipv4/ipv6 operate on
> the UDP socket rather than whatever random thing happens to be in
> skb->sk.
>
> Based upon a patch by Jiri Pirko.
>
> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
> ---
>  drivers/net/vxlan.c           | 14 ++++++++------
>  include/net/ip6_tunnel.h      |  5 +++--
>  include/net/ipv6.h            |  1 +
>  include/net/udp_tunnel.h      |  5 +++--
>  include/net/vxlan.h           |  2 +-
>  net/ipv4/geneve.c             |  2 +-
>  net/ipv4/udp_tunnel.c         |  4 ++--
>  net/ipv6/ip6_gre.c            |  2 +-
>  net/ipv6/ip6_tunnel.c         |  2 +-
>  net/ipv6/ip6_udp_tunnel.c     |  5 +++--
>  net/ipv6/output_core.c        | 21 ++++++++++++++++-----
>  net/openvswitch/vport-vxlan.c |  5 +++--
>  net/tipc/udp_media.c          |  6 ++++--
>  13 files changed, 47 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index b5fecb4..51baac7 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -1672,7 +1672,8 @@ static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
>  }
>
>  #if IS_ENABLED(CONFIG_IPV6)
> -static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
> +static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
> +                          struct sk_buff *skb,
>                            struct net_device *dev, struct in6_addr *saddr,
>                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
>                            __be16 src_port, __be16 dst_port,
> @@ -1748,7 +1749,7 @@ static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
>
>         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
>
> -       udp_tunnel6_xmit_skb(dst, skb, dev, saddr, daddr, prio,
> +       udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
>                              ttl, src_port, dst_port,
>                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
>         return 0;
> @@ -1758,7 +1759,7 @@ err:
>  }
>  #endif
>
> -int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
> +int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
>                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
>                    __be16 src_port, __be16 dst_port,
>                    struct vxlan_metadata *md, bool xnet, u32 vxflags)
> @@ -1827,7 +1828,7 @@ int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
>
>         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
>
> -       return udp_tunnel_xmit_skb(rt, skb, src, dst, tos,
> +       return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
>                                    ttl, df, src_port, dst_port, xnet,
>                                    !(vxflags & VXLAN_F_UDP_CSUM));
>  }
> @@ -1882,6 +1883,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
>                            struct vxlan_rdst *rdst, bool did_rsc)
>  {
>         struct vxlan_dev *vxlan = netdev_priv(dev);
> +       struct sock *sk = vxlan->vn_sock->sock->sk;
>         struct rtable *rt = NULL;
>         const struct iphdr *old_iph;
>         struct flowi4 fl4;
> @@ -1961,7 +1963,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
>                 md.vni = htonl(vni << 8);
>                 md.gbp = skb->mark;
>
> -               err = vxlan_xmit_skb(rt, skb, fl4.saddr,
> +               err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
>                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
>                                      src_port, dst_port, &md,
>                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
> @@ -2021,7 +2023,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
>                 md.vni = htonl(vni << 8);
>                 md.gbp = skb->mark;
>
> -               err = vxlan6_xmit_skb(ndst, skb, dev, &fl6.saddr, &fl6.daddr,
> +               err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
>                                       0, ttl, src_port, dst_port, &md,
>                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
>                                       vxlan->flags);
> diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h
> index 1668be5..b8529aa 100644
> --- a/include/net/ip6_tunnel.h
> +++ b/include/net/ip6_tunnel.h
> @@ -73,13 +73,14 @@ __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);
>
> -static inline void ip6tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
> +static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
> +                                 struct net_device *dev)
>  {
>         struct net_device_stats *stats = &dev->stats;
>         int pkt_len, err;
>
>         pkt_len = skb->len;
> -       err = ip6_local_out(skb);
> +       err = ip6_local_out_sk(sk, skb);
>
>         if (net_xmit_eval(err) == 0) {
>                 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
> diff --git a/include/net/ipv6.h b/include/net/ipv6.h
> index b6ae959..27470cd 100644
> --- a/include/net/ipv6.h
> +++ b/include/net/ipv6.h
> @@ -827,6 +827,7 @@ int ip6_input(struct sk_buff *skb);
>  int ip6_mc_input(struct sk_buff *skb);
>
>  int __ip6_local_out(struct sk_buff *skb);
> +int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb);
>  int ip6_local_out(struct sk_buff *skb);
>
>  /*
> diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
> index 1a20d33..c491c12 100644
> --- a/include/net/udp_tunnel.h
> +++ b/include/net/udp_tunnel.h
> @@ -77,13 +77,14 @@ void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
>                            struct udp_tunnel_sock_cfg *sock_cfg);
>
>  /* Transmit the skb using UDP encapsulation. */
> -int udp_tunnel_xmit_skb(struct rtable *rt, struct sk_buff *skb,
> +int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
>                         __be32 src, __be32 dst, __u8 tos, __u8 ttl,
>                         __be16 df, __be16 src_port, __be16 dst_port,
>                         bool xnet, bool nocheck);
>
>  #if IS_ENABLED(CONFIG_IPV6)
> -int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
> +int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
> +                        struct sk_buff *skb,
>                          struct net_device *dev, struct in6_addr *saddr,
>                          struct in6_addr *daddr,
>                          __u8 prio, __u8 ttl, __be16 src_port,
> diff --git a/include/net/vxlan.h b/include/net/vxlan.h
> index 756e463..0082b5d 100644
> --- a/include/net/vxlan.h
> +++ b/include/net/vxlan.h
> @@ -145,7 +145,7 @@ struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
>
>  void vxlan_sock_release(struct vxlan_sock *vs);
>
> -int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
> +int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
>                    __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
>                    __be16 src_port, __be16 dst_port, struct vxlan_metadata *md,
>                    bool xnet, u32 vxflags);
> diff --git a/net/ipv4/geneve.c b/net/ipv4/geneve.c
> index e64f8e9..b77f5e8 100644
> --- a/net/ipv4/geneve.c
> +++ b/net/ipv4/geneve.c
> @@ -136,7 +136,7 @@ int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
>
>         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
>
> -       return udp_tunnel_xmit_skb(rt, skb, src, dst,
> +       return udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, src, dst,
>                                    tos, ttl, df, src_port, dst_port, xnet,
>                                    !csum);
>  }
> diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel.c
> index c83b354..6bb98cc 100644
> --- a/net/ipv4/udp_tunnel.c
> +++ b/net/ipv4/udp_tunnel.c
> @@ -75,7 +75,7 @@ void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
>  }
>  EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
>
> -int udp_tunnel_xmit_skb(struct rtable *rt, struct sk_buff *skb,
> +int udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
>                         __be32 src, __be32 dst, __u8 tos, __u8 ttl,
>                         __be16 df, __be16 src_port, __be16 dst_port,
>                         bool xnet, bool nocheck)
> @@ -92,7 +92,7 @@ int udp_tunnel_xmit_skb(struct rtable *rt, struct sk_buff *skb,
>
>         udp_set_csum(nocheck, skb, src, dst, skb->len);
>
> -       return iptunnel_xmit(skb->sk, rt, skb, src, dst, IPPROTO_UDP,
> +       return iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP,
>                              tos, ttl, df, xnet);
>  }
>  EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
> diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
> index f724329..b5e6cc1 100644
> --- a/net/ipv6/ip6_gre.c
> +++ b/net/ipv6/ip6_gre.c
> @@ -760,7 +760,7 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
>
>         skb_set_inner_protocol(skb, protocol);
>
> -       ip6tunnel_xmit(skb, dev);
> +       ip6tunnel_xmit(NULL, skb, dev);
>         if (ndst)
>                 ip6_tnl_dst_store(tunnel, ndst);
>         return 0;
> diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
> index b6a211a..5cafd92 100644
> --- a/net/ipv6/ip6_tunnel.c
> +++ b/net/ipv6/ip6_tunnel.c
> @@ -1100,7 +1100,7 @@ static int ip6_tnl_xmit2(struct sk_buff *skb,
>         ipv6h->nexthdr = proto;
>         ipv6h->saddr = fl6->saddr;
>         ipv6h->daddr = fl6->daddr;
> -       ip6tunnel_xmit(skb, dev);
> +       ip6tunnel_xmit(NULL, skb, dev);

By same should logic iptunnel_xmit call in ip_tunnel_xmit should take
NULL arg for socket?


>         if (ndst)
>                 ip6_tnl_dst_store(t, ndst);
>         return 0;
> diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c
> index 32d9b26..bba8903 100644
> --- a/net/ipv6/ip6_udp_tunnel.c
> +++ b/net/ipv6/ip6_udp_tunnel.c
> @@ -62,7 +62,8 @@ error:
>  }
>  EXPORT_SYMBOL_GPL(udp_sock_create6);
>
> -int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
> +int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
> +                        struct sk_buff *skb,
>                          struct net_device *dev, struct in6_addr *saddr,
>                          struct in6_addr *daddr,
>                          __u8 prio, __u8 ttl, __be16 src_port,
> @@ -97,7 +98,7 @@ int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
>         ip6h->daddr       = *daddr;
>         ip6h->saddr       = *saddr;
>
> -       ip6tunnel_xmit(skb, dev);
> +       ip6tunnel_xmit(sk, skb, dev);
>         return 0;
>  }
>  EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
> diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
> index 7d1131d..85892af 100644
> --- a/net/ipv6/output_core.c
> +++ b/net/ipv6/output_core.c
> @@ -136,7 +136,7 @@ int ip6_dst_hoplimit(struct dst_entry *dst)
>  EXPORT_SYMBOL(ip6_dst_hoplimit);
>  #endif
>
> -int __ip6_local_out(struct sk_buff *skb)
> +static int __ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
>  {
>         int len;
>
> @@ -146,19 +146,30 @@ int __ip6_local_out(struct sk_buff *skb)
>         ipv6_hdr(skb)->payload_len = htons(len);
>         IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
>
> -       return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb->sk, skb,
> +       return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, sk, skb,
>                        NULL, skb_dst(skb)->dev, dst_output_sk);
>  }
> +
> +int __ip6_local_out(struct sk_buff *skb)
> +{
> +       return __ip6_local_out_sk(skb->sk, skb);
> +}
>  EXPORT_SYMBOL_GPL(__ip6_local_out);
>
> -int ip6_local_out(struct sk_buff *skb)
> +int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
>  {
>         int err;
>
> -       err = __ip6_local_out(skb);
> +       err = __ip6_local_out_sk(sk, skb);
>         if (likely(err == 1))
> -               err = dst_output(skb);
> +               err = dst_output_sk(sk, skb);
>
>         return err;
>  }
> +EXPORT_SYMBOL_GPL(ip6_local_out_sk);
> +
> +int ip6_local_out(struct sk_buff *skb)
> +{
> +       return ip6_local_out_sk(skb->sk, skb);
> +}
>  EXPORT_SYMBOL_GPL(ip6_local_out);
> diff --git a/net/openvswitch/vport-vxlan.c b/net/openvswitch/vport-vxlan.c
> index 3277a75..6d39766 100644
> --- a/net/openvswitch/vport-vxlan.c
> +++ b/net/openvswitch/vport-vxlan.c
> @@ -222,7 +222,8 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
>  {
>         struct net *net = ovs_dp_get_net(vport->dp);
>         struct vxlan_port *vxlan_port = vxlan_vport(vport);
> -       __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
> +       struct sock *sk = vxlan_port->vs->sock->sk;
> +       __be16 dst_port = inet_sk(sk)->inet_sport;
>         const struct ovs_key_ipv4_tunnel *tun_key;
>         struct vxlan_metadata md = {0};
>         struct rtable *rt;
> @@ -255,7 +256,7 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
>         vxflags = vxlan_port->exts |
>                       (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0);
>
> -       err = vxlan_xmit_skb(rt, skb, fl.saddr, tun_key->ipv4_dst,
> +       err = vxlan_xmit_skb(rt, sk, skb, fl.saddr, tun_key->ipv4_dst,
>                              tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
>                              src_port, dst_port,
>                              &md, false, vxflags);
> diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
> index ef3d7aa..66deebc 100644
> --- a/net/tipc/udp_media.c
> +++ b/net/tipc/udp_media.c
> @@ -176,7 +176,8 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
>                         goto tx_error;
>                 }
>                 ttl = ip4_dst_hoplimit(&rt->dst);
> -               err = udp_tunnel_xmit_skb(rt, clone, src->ipv4.s_addr,
> +               err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, clone,
> +                                         src->ipv4.s_addr,
>                                           dst->ipv4.s_addr, 0, ttl, 0,
>                                           src->udp_port, dst->udp_port,
>                                           false, true);
> @@ -197,7 +198,8 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
>                 if (err)
>                         goto tx_error;
>                 ttl = ip6_dst_hoplimit(ndst);
> -               err = udp_tunnel6_xmit_skb(ndst, clone, ndst->dev, &src->ipv6,
> +               err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, clone,
> +                                          ndst->dev, &src->ipv6,
>                                            &dst->ipv6, 0, ttl, src->udp_port,
>                                            dst->udp_port, false);
>  #endif
> --
> 2.1.0
>
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