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Date: Fri, 12 Sep 2014 14:35:02 -0700
From: Tom Herbert <therbert@...gle.com>
To: Andy Zhou <azhou@...ira.com>
Cc: David Miller <davem@...emloft.net>,
Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [net-next v5 1/3] udp-tunnel: Expand UDP tunnel APIs
On Wed, Sep 10, 2014 at 8:29 PM, Andy Zhou <azhou@...ira.com> wrote:
> Added common udp tunnel socket creation, and packet transmission APIs
> API that can be used by other UDP based tunneling protocol
> implementation.
>
> Signed-off-by: Andy Zhou <azhou@...ira.com>
> ---
> include/net/udp_tunnel.h | 73 +++++++++++++++++++++++++++
> net/ipv4/Kconfig | 1 +
> net/ipv4/udp_tunnel.c | 108 ++++++++++++++++++++++++++--------------
> net/ipv6/Makefile | 1 +
> net/ipv6/ip6_udp_tunnel.c | 121 +++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 268 insertions(+), 36 deletions(-)
> create mode 100644 net/ipv6/ip6_udp_tunnel.c
>
> diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
> index ffd69cb..e9dcf83 100644
> --- a/include/net/udp_tunnel.h
> +++ b/include/net/udp_tunnel.h
> @@ -1,6 +1,14 @@
> #ifndef __NET_UDP_TUNNEL_H
> #define __NET_UDP_TUNNEL_H
>
> +#include <net/ip_tunnels.h>
> +#include <net/udp.h>
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +#include <net/ipv6.h>
> +#include <net/addrconf.h>
> +#endif
> +
> struct udp_port_cfg {
> u8 family;
>
> @@ -29,4 +37,69 @@ struct udp_port_cfg {
> int udp_sock_create(struct net *net, struct udp_port_cfg *cfg,
> struct socket **sockp);
>
> +#if IS_ENABLED(CONFIG_IPV6)
> +int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
> + struct socket **sockp);
> +#else
> +static inline int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
> + struct socket **sockp)
> +{
> + return 0;
> +}
> +#endif
> +
> +struct udp_tunnel_sock;
> +
> +typedef int (*udp_tunnel_encap_rcv_t)(struct sock *sk, struct sk_buff *skb);
> +typedef void (*udp_tunnel_encap_destroy_t)(struct sock *sk);
> +
> +struct udp_tunnel_sock_cfg {
> + struct socket *sock; /* The socket UDP tunnel will attach to */
> + /* Used for setting up udp_sock fields, see udp.h for details */
> + __u8 encap_type;
> + udp_tunnel_encap_rcv_t encap_rcv;
> + udp_tunnel_encap_destroy_t encap_destroy;
> +};
> +
> +struct udp_tunnel_sock {
> + struct socket *sock;
> +};
> +
> +struct udp_tunnel_sock *create_udp_tunnel_sock(struct net *net, size_t size,
> + struct udp_tunnel_sock_cfg
> + *sock_cfg);
> +
> +int udp_tunnel_xmit_skb(struct udp_tunnel_sock *uts, struct rtable *rt,
> + struct sk_buff *skb, __be32 src, __be32 dst,
> + __u8 tos, __u8 ttl, __be16 df, __be16 src_port,
> + __be16 dst_port, bool xnet);
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +int udp_tunnel6_xmit_skb(struct udp_tunnel_sock *uts, struct dst_entry *dst,
> + 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);
> +#endif
> +
> +void udp_tunnel_sock_release(struct udp_tunnel_sock *uts);
> +void udp_tunnel_sock_free(struct udp_tunnel_sock *uts);
> +
> +static inline struct sk_buff *udp_tunnel_handle_offloads(struct sk_buff *skb,
> + bool udp_csum)
> +{
> + int type = udp_csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
> +
> + return iptunnel_handle_offloads(skb, udp_csum, type);
> +}
> +
> +static inline void udp_tunnel_encap_enable(struct socket *sock)
> +{
> +#if IS_ENABLED(CONFIG_IPV6)
> + if (sock->sk->sk_family == PF_INET6)
> + ipv6_stub->udpv6_encap_enable();
> + else
> +#endif
> + udp_encap_enable();
> +}
> #endif
> diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
> index dbc10d8..cccb95f 100644
> --- a/net/ipv4/Kconfig
> +++ b/net/ipv4/Kconfig
> @@ -308,6 +308,7 @@ config NET_IPVTI
> on top.
>
> config NET_UDP_TUNNEL
> + depends on (IPV6 || IPV6=n)
> tristate
> default n
>
> diff --git a/net/ipv4/udp_tunnel.c b/net/ipv4/udp_tunnel.c
> index 61ec1a6..d60c1a0 100644
> --- a/net/ipv4/udp_tunnel.c
> +++ b/net/ipv4/udp_tunnel.c
> @@ -14,42 +14,9 @@ int udp_sock_create(struct net *net, struct udp_port_cfg *cfg,
> int err = -EINVAL;
> struct socket *sock = NULL;
>
> -#if IS_ENABLED(CONFIG_IPV6)
> if (cfg->family == AF_INET6) {
> - struct sockaddr_in6 udp6_addr;
> -
> - err = sock_create_kern(AF_INET6, SOCK_DGRAM, 0, &sock);
> - if (err < 0)
> - goto error;
> -
> - sk_change_net(sock->sk, net);
> -
> - udp6_addr.sin6_family = AF_INET6;
> - memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
> - sizeof(udp6_addr.sin6_addr));
> - udp6_addr.sin6_port = cfg->local_udp_port;
> - err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
> - sizeof(udp6_addr));
> - if (err < 0)
> - goto error;
> -
> - if (cfg->peer_udp_port) {
> - udp6_addr.sin6_family = AF_INET6;
> - memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
> - sizeof(udp6_addr.sin6_addr));
> - udp6_addr.sin6_port = cfg->peer_udp_port;
> - err = kernel_connect(sock,
> - (struct sockaddr *)&udp6_addr,
> - sizeof(udp6_addr), 0);
> - }
> - if (err < 0)
> - goto error;
> -
> - udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
> - udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
> - } else
> -#endif
> - if (cfg->family == AF_INET) {
> + return udp_sock_create6(net, cfg, sockp);
> + } else if (cfg->family == AF_INET) {
> struct sockaddr_in udp_addr;
>
> err = sock_create_kern(AF_INET, SOCK_DGRAM, 0, &sock);
> @@ -82,7 +49,6 @@ int udp_sock_create(struct net *net, struct udp_port_cfg *cfg,
> return -EPFNOSUPPORT;
> }
>
> -
> *sockp = sock;
>
> return 0;
> @@ -97,4 +63,74 @@ error:
> }
> EXPORT_SYMBOL(udp_sock_create);
>
> +struct udp_tunnel_sock *
> +create_udp_tunnel_sock(struct net *net, size_t size,
> + struct udp_tunnel_sock_cfg *cfg)
> +{
> + struct udp_tunnel_sock *uts;
> + struct sock *sk;
> + struct socket *sock = cfg->sock;
> +
> + uts = kzalloc(size, GFP_KERNEL);
> + if (!uts)
> + return ERR_PTR(-ENOMEM);
> +
> + sk = sock->sk;
> +
> + /* Disable multicast loopback */
> + inet_sk(sk)->mc_loop = 0;
> +
> + rcu_assign_sk_user_data(sk, uts);
> +
> + udp_sk(sk)->encap_type = cfg->encap_type;
> + udp_sk(sk)->encap_rcv = cfg->encap_rcv;
> + udp_sk(sk)->encap_destroy = cfg->encap_destroy;
> +
> + uts->sock = sock;
> +
> + udp_tunnel_encap_enable(sock);
> +
> + return uts;
> +}
> +EXPORT_SYMBOL_GPL(create_udp_tunnel_sock);
> +
> +int udp_tunnel_xmit_skb(struct udp_tunnel_sock *uts, struct rtable *rt,
> + struct sk_buff *skb, __be32 src, __be32 dst,
> + __u8 tos, __u8 ttl, __be16 df, __be16 src_port,
> + __be16 dst_port, bool xnet)
> +{
> + struct udphdr *uh;
> + struct socket *sock = uts->sock;
> +
> + __skb_push(skb, sizeof(*uh));
> + skb_reset_transport_header(skb);
> + uh = udp_hdr(skb);
> +
> + uh->dest = dst_port;
> + uh->source = src_port;
> + uh->len = htons(skb->len);
> +
> + udp_set_csum(sock->sk->sk_no_check_tx, skb, src, dst, skb->len);
> +
> + return iptunnel_xmit(sock->sk, rt, skb, src, dst, IPPROTO_UDP,
> + tos, ttl, df, xnet);
> +}
> +EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
> +
> +void udp_tunnel_sock_release(struct udp_tunnel_sock *uts)
> +{
> + struct sock *sk = uts->sock->sk;
> +
> + rcu_assign_sk_user_data(uts->sock->sk, NULL);
> + kernel_sock_shutdown(uts->sock, SHUT_RDWR);
> + sk_release_kernel(sk);
> +}
> +EXPORT_SYMBOL_GPL(udp_tunnel_sock_release);
> +
> +void udp_tunnel_sock_free(struct udp_tunnel_sock *uts)
> +{
> + kfree(uts);
> +}
> +EXPORT_SYMBOL_GPL(udp_tunnel_sock_free);
> +
> MODULE_LICENSE("GPL");
> diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
> index 2fe6836..45f830e 100644
> --- a/net/ipv6/Makefile
> +++ b/net/ipv6/Makefile
> @@ -35,6 +35,7 @@ obj-$(CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION) += xfrm6_mode_ro.o
> obj-$(CONFIG_INET6_XFRM_MODE_BEET) += xfrm6_mode_beet.o
> obj-$(CONFIG_IPV6_MIP6) += mip6.o
> obj-$(CONFIG_NETFILTER) += netfilter/
> +obj-$(CONFIG_NET_UDP_TUNNEL) += ip6_udp_tunnel.o
>
> obj-$(CONFIG_IPV6_VTI) += ip6_vti.o
> obj-$(CONFIG_IPV6_SIT) += sit.o
> diff --git a/net/ipv6/ip6_udp_tunnel.c b/net/ipv6/ip6_udp_tunnel.c
> new file mode 100644
> index 0000000..5109f46
> --- /dev/null
> +++ b/net/ipv6/ip6_udp_tunnel.c
> @@ -0,0 +1,121 @@
> +#include <linux/module.h>
> +#include <linux/errno.h>
> +#include <linux/socket.h>
> +#include <linux/udp.h>
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/in6.h>
> +#include <net/udp.h>
> +#include <net/udp_tunnel.h>
> +#include <net/net_namespace.h>
> +#include <net/netns/generic.h>
> +#include <net/ip6_tunnel.h>
> +#include <net/ip6_checksum.h>
> +
> +int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
> + struct socket **sockp)
> +{
> + struct sockaddr_in6 udp6_addr;
> + int err = -EINVAL;
> + struct socket *sock = NULL;
> +
> + err = sock_create_kern(AF_INET6, SOCK_DGRAM, 0, &sock);
> + if (err < 0)
> + goto error;
> +
> + sk_change_net(sock->sk, net);
> +
> + udp6_addr.sin6_family = AF_INET6;
> + memcpy(&udp6_addr.sin6_addr, &cfg->local_ip6,
> + sizeof(udp6_addr.sin6_addr));
> + udp6_addr.sin6_port = cfg->local_udp_port;
> + err = kernel_bind(sock, (struct sockaddr *)&udp6_addr,
> + sizeof(udp6_addr));
> + if (err < 0)
> + goto error;
> +
> + if (cfg->peer_udp_port) {
> + udp6_addr.sin6_family = AF_INET6;
> + memcpy(&udp6_addr.sin6_addr, &cfg->peer_ip6,
> + sizeof(udp6_addr.sin6_addr));
> + udp6_addr.sin6_port = cfg->peer_udp_port;
> + err = kernel_connect(sock,
> + (struct sockaddr *)&udp6_addr,
> + sizeof(udp6_addr), 0);
> + }
> + if (err < 0)
> + goto error;
> +
> + udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
> + udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
> +
> + *sockp = sock;
> + return 0;
> +
> +error:
> + if (sock) {
> + kernel_sock_shutdown(sock, SHUT_RDWR);
> + sk_release_kernel(sock->sk);
> + }
> + *sockp = NULL;
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(udp_sock_create6);
> +
> +int udp_tunnel6_xmit_skb(struct udp_tunnel_sock *uts, struct dst_entry *dst,
> + 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)
> +{
> + struct udphdr *uh;
> + struct ipv6hdr *ip6h;
> +
> + __skb_push(skb, sizeof(*uh));
> + skb_reset_transport_header(skb);
> + uh = udp_hdr(skb);
> +
> + uh->dest = dst_port;
> + uh->source = src_port;
> +
> + uh->len = htons(skb->len);
> + uh->check = 0;
> +
> + memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
> + IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED
> + | IPSKB_REROUTED);
> + skb_dst_set(skb, dst);
> +
> + if (!skb_is_gso(skb) && !(dst->dev->features & NETIF_F_IPV6_CSUM)) {
> + __wsum csum = skb_checksum(skb, 0, skb->len, 0);
> +
> + skb->ip_summed = CHECKSUM_UNNECESSARY;
> + uh->check = csum_ipv6_magic(saddr, daddr, skb->len,
> + IPPROTO_UDP, csum);
> + if (uh->check == 0)
> + uh->check = CSUM_MANGLED_0;
> + } else {
> + skb->ip_summed = CHECKSUM_PARTIAL;
> + skb->csum_start = skb_transport_header(skb) - skb->head;
> + skb->csum_offset = offsetof(struct udphdr, check);
> + uh->check = ~csum_ipv6_magic(saddr, daddr,
> + skb->len, IPPROTO_UDP, 0);
> + }
> +
> + __skb_push(skb, sizeof(*ip6h));
> + skb_reset_network_header(skb);
> + ip6h = ipv6_hdr(skb);
> + ip6h->version = 6;
> + ip6h->priority = prio;
> + ip6h->flow_lbl[0] = 0;
> + ip6h->flow_lbl[1] = 0;
> + ip6h->flow_lbl[2] = 0;
Please call ip6_flow_hdr to set up flow label (see ip6_tnl_xmit2 for instance).
> + ip6h->payload_len = htons(skb->len);
> + ip6h->nexthdr = IPPROTO_UDP;
> + ip6h->hop_limit = ttl;
> + ip6h->daddr = *daddr;
> + ip6h->saddr = *saddr;
> +
> + ip6tunnel_xmit(skb, dev);
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(udp_tunnel6_xmit_skb);
> --
> 1.7.9.5
>
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