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Re: [PATCH v5] ipvs: allow tunneling with gue encapsulation

To: Simon Horman <horms@xxxxxxxxxxxx>
Subject: Re: [PATCH v5] ipvs: allow tunneling with gue encapsulation
Cc: jacky.hu@xxxxxxxxxxx, jason.niesz@xxxxxxxxxxx, "David S. Miller" <davem@xxxxxxxxxxxxx>, Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>, Hideaki YOSHIFUJI <yoshfuji@xxxxxxxxxxxxxx>, Wensong Zhang <wensong@xxxxxxxxxxxx>, Julian Anastasov <ja@xxxxxx>, Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>, Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>, Florian Westphal <fw@xxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, lvs-devel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx, coreteam@xxxxxxxxxxxxx
From: Jacky Hu <hengqing.hu@xxxxxxxxx>
Date: Mon, 25 Mar 2019 20:56:08 +0800
On Mon, Mar 25, 2019 at 11:46:40AM +0100, Simon Horman wrote:
> On Tue, Mar 19, 2019 at 01:26:55PM +0800, Jacky Hu wrote:
> > ipip packets are blocked in some public cloud environments, this patch
> > allows gue encapsulation with the tunneling method, which would make
> > tunneling working in those environments.
> > 
> > Signed-off-by: Jacky Hu <hengqing.hu@xxxxxxxxx>
> > ---
> >  include/net/ip_vs.h             |   5 ++
> >  include/uapi/linux/ip_vs.h      |  11 +++
> >  net/netfilter/ipvs/ip_vs_ctl.c  |  43 ++++++++++-
> >  net/netfilter/ipvs/ip_vs_xmit.c | 124 ++++++++++++++++++++++++++++++--
> >  4 files changed, 178 insertions(+), 5 deletions(-)
> > 
> > diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
> > index a0d2e0bb9a94..cdc7b621930d 100644
> > --- a/include/net/ip_vs.h
> > +++ b/include/net/ip_vs.h
> > @@ -603,6 +603,9 @@ struct ip_vs_dest_user_kern {
> >  
> >     /* Address family of addr */
> >     u16                     af;
> > +
> > +   u16                     tun_type;       /* tunnel type */
> > +   __be16                  tun_port;       /* tunnel port */
> >  };
> >  
> >  
> > @@ -663,6 +666,8 @@ struct ip_vs_dest {
> >     atomic_t                conn_flags;     /* flags to copy to conn */
> >     atomic_t                weight;         /* server weight */
> >     atomic_t                last_weight;    /* server latest weight */
> > +   __u16                   tun_type;       /* tunnel type */
> > +   __be16                  tun_port;       /* tunnel port */
> >  
> >     refcount_t              refcnt;         /* reference counter */
> >     struct ip_vs_stats      stats;          /* statistics */
> > diff --git a/include/uapi/linux/ip_vs.h b/include/uapi/linux/ip_vs.h
> > index 1c916b2f89dc..e34f436fc79d 100644
> > --- a/include/uapi/linux/ip_vs.h
> > +++ b/include/uapi/linux/ip_vs.h
> > @@ -124,6 +124,13 @@
> >  
> >  #define IP_VS_PEDATA_MAXLEN     255
> >  
> > +/* Tunnel types */
> > +enum {
> > +   IP_VS_CONN_F_TUNNEL_TYPE_IPIP = 0,      /* IPIP */
> > +   IP_VS_CONN_F_TUNNEL_TYPE_GUE,           /* GUE */
> > +   IP_VS_CONN_F_TUNNEL_TYPE_MAX,
> > +};
> > +
> >  /*
> >   * The struct ip_vs_service_user and struct ip_vs_dest_user are
> >   * used to set IPVS rules through setsockopt.
> > @@ -392,6 +399,10 @@ enum {
> >  
> >     IPVS_DEST_ATTR_STATS64,         /* nested attribute for dest stats */
> >  
> > +   IPVS_DEST_ATTR_TUN_TYPE,        /* tunnel type */
> > +
> > +   IPVS_DEST_ATTR_TUN_PORT,        /* tunnel port */
> > +
> >     __IPVS_DEST_ATTR_MAX,
> >  };
> >  
> > diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> > index 432141f04af3..ddee6266b78b 100644
> > --- a/net/netfilter/ipvs/ip_vs_ctl.c
> > +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> > @@ -830,6 +830,10 @@ __ip_vs_update_dest(struct ip_vs_service *svc, struct 
> > ip_vs_dest *dest,
> >     conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
> >     conn_flags |= IP_VS_CONN_F_INACTIVE;
> >  
> > +   /* set the tunnel info */
> > +   dest->tun_type = udest->tun_type;
> > +   dest->tun_port = udest->tun_port;
> > +
> >     /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
> >     if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
> >             conn_flags |= IP_VS_CONN_F_NOOUTPUT;
> > @@ -980,6 +984,17 @@ ip_vs_add_dest(struct ip_vs_service *svc, struct 
> > ip_vs_dest_user_kern *udest)
> >             return -ERANGE;
> >     }
> >  
> > +   switch (udest->tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> 
> Given that tun_type check acts on an integer, as opposed to an enum,
> I don't see that using a switch statement gives us much here,
> and throughout the patch, other than extra verbosity.
> 
> Did you consider simply using an if statement?
> 
I was thinking about maybe IP_VS_CONN_F_TUNNEL_TYPE_FOU would be introduced
later.
But yes, I can simply using an if statement if you think that's more
appropriate.
> > +           if (udest->tun_port == 0) {
> > +                   pr_err("%s(): tunnel port is zero\n", __func__);
> > +                   return -EINVAL;
> > +           }
> > +           break;
> > +   default:
> > +           break;
> > +   }
> > +
> >     ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
> >  
> >     /* We use function that requires RCU lock */
> > @@ -1044,6 +1059,17 @@ ip_vs_edit_dest(struct ip_vs_service *svc, struct 
> > ip_vs_dest_user_kern *udest)
> >             return -ERANGE;
> >     }
> >  
> > +   switch (udest->tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +           if (udest->tun_port == 0) {
> > +                   pr_err("%s(): tunnel port is zero\n", __func__);
> > +                   return -EINVAL;
> > +           }
> > +           break;
> > +   default:
> > +           break;
> > +   }
> > +
> >     ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
> >  
> >     /* We use function that requires RCU lock */
> > @@ -2310,6 +2336,7 @@ static void ip_vs_copy_udest_compat(struct 
> > ip_vs_dest_user_kern *udest,
> >     udest->u_threshold      = udest_compat->u_threshold;
> >     udest->l_threshold      = udest_compat->l_threshold;
> >     udest->af               = AF_INET;
> > +   udest->tun_type         = IP_VS_CONN_F_TUNNEL_TYPE_IPIP;
> >  }
> >  
> >  static int
> > @@ -2869,6 +2896,8 @@ static const struct nla_policy 
> > ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
> >     [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
> >     [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
> >     [IPVS_DEST_ATTR_ADDR_FAMILY]    = { .type = NLA_U16 },
> > +   [IPVS_DEST_ATTR_TUN_TYPE]       = { .type = NLA_U8 },
> > +   [IPVS_DEST_ATTR_TUN_PORT]       = { .type = NLA_U16 },
> >  };
> >  
> >  static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
> > @@ -3172,6 +3201,10 @@ static int ip_vs_genl_fill_dest(struct sk_buff *skb, 
> > struct ip_vs_dest *dest)
> >                      IP_VS_CONN_F_FWD_MASK)) ||
> >         nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
> >                     atomic_read(&dest->weight)) ||
> > +       nla_put_u8(skb, IPVS_DEST_ATTR_TUN_TYPE,
> > +                  dest->tun_type) ||
> > +       nla_put_be16(skb, IPVS_DEST_ATTR_TUN_PORT,
> > +                    dest->tun_port) ||
> >         nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
> >         nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
> >         nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
> > @@ -3294,12 +3327,14 @@ static int ip_vs_genl_parse_dest(struct 
> > ip_vs_dest_user_kern *udest,
> >     /* If a full entry was requested, check for the additional fields */
> >     if (full_entry) {
> >             struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
> > -                         *nla_l_thresh;
> > +                         *nla_l_thresh, *nla_tun_type, *nla_tun_port;
> >  
> >             nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
> >             nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
> >             nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
> >             nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
> > +           nla_tun_type    = attrs[IPVS_DEST_ATTR_TUN_TYPE];
> > +           nla_tun_port    = attrs[IPVS_DEST_ATTR_TUN_PORT];
> >  
> >             if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
> >                     return -EINVAL;
> > @@ -3309,6 +3344,12 @@ static int ip_vs_genl_parse_dest(struct 
> > ip_vs_dest_user_kern *udest,
> >             udest->weight = nla_get_u32(nla_weight);
> >             udest->u_threshold = nla_get_u32(nla_u_thresh);
> >             udest->l_threshold = nla_get_u32(nla_l_thresh);
> > +
> > +           if (nla_tun_type)
> > +                   udest->tun_type = nla_get_u8(nla_tun_type);
> > +
> > +           if (nla_tun_port)
> > +                   udest->tun_port = nla_get_be16(nla_tun_port);
> >     }
> >  
> >     return 0;
> > diff --git a/net/netfilter/ipvs/ip_vs_xmit.c 
> > b/net/netfilter/ipvs/ip_vs_xmit.c
> > index 473cce2a5231..730e108b9f36 100644
> > --- a/net/netfilter/ipvs/ip_vs_xmit.c
> > +++ b/net/netfilter/ipvs/ip_vs_xmit.c
> > @@ -32,6 +32,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/tcp.h>                  /* for tcphdr */
> >  #include <net/ip.h>
> > +#include <net/gue.h>
> >  #include <net/tcp.h>                    /* for csum_tcpudp_magic */
> >  #include <net/udp.h>
> >  #include <net/icmp.h>                   /* for icmp_send */
> > @@ -382,6 +383,15 @@ __ip_vs_get_out_rt(struct netns_ipvs *ipvs, int 
> > skb_af, struct sk_buff *skb,
> >             mtu = dst_mtu(&rt->dst);
> >     } else {
> >             mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
> > +           if (!dest)
> > +                   goto err_put;
> > +           switch (dest->tun_type) {
> > +           case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +                   mtu -= sizeof(struct udphdr) + sizeof(struct guehdr);
> > +                   break;
> > +           default:
> > +                   break;
> > +           }
> >             if (mtu < 68) {
> >                     IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
> >                     goto err_put;
> > @@ -533,6 +543,15 @@ __ip_vs_get_out_rt_v6(struct netns_ipvs *ipvs, int 
> > skb_af, struct sk_buff *skb,
> >             mtu = dst_mtu(&rt->dst);
> >     else {
> >             mtu = dst_mtu(&rt->dst) - sizeof(struct ipv6hdr);
> > +           if (!dest)
> > +                   goto err_put;
> > +           switch (dest->tun_type) {
> > +           case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +                   mtu -= sizeof(struct udphdr) + sizeof(struct guehdr);
> > +                   break;
> > +           default:
> > +                   break;
> > +           }
> >             if (mtu < IPV6_MIN_MTU) {
> >                     IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
> >                                  IPV6_MIN_MTU);
> > @@ -989,6 +1008,41 @@ static inline int __tun_gso_type_mask(int encaps_af, 
> > int orig_af)
> >     }
> >  }
> >  
> > +static int
> > +ipvs_gue_encap(struct net *net, struct sk_buff *skb,
> > +          struct ip_vs_conn *cp, __u8 *next_protocol)
> > +{
> > +   __be16 dport;
> > +   __be16 sport = udp_flow_src_port(net, skb, 0, 0, false);
> > +   struct udphdr  *udph;   /* Our new UDP header */
> > +   struct guehdr  *gueh;   /* Our new GUE header */
> > +
> > +   skb_push(skb, sizeof(struct guehdr));
> > +
> > +   gueh = (struct guehdr *)skb->data;
> > +
> > +   gueh->control = 0;
> > +   gueh->version = 0;
> > +   gueh->hlen = 0;
> > +   gueh->flags = 0;
> > +   gueh->proto_ctype = *next_protocol;
> > +
> > +   skb_push(skb, sizeof(struct udphdr));
> > +   skb_reset_transport_header(skb);
> > +
> > +   udph = udp_hdr(skb);
> > +
> > +   dport = cp->dest->tun_port;
> > +   udph->dest = dport;
> > +   udph->source = sport;
> > +   udph->len = htons(skb->len);
> > +   udph->check = 0;
> > +
> > +   *next_protocol = IPPROTO_UDP;
> > +
> > +   return 0;
> > +}
> > +
> >  /*
> >   *   IP Tunneling transmitter
> >   *
> > @@ -1025,6 +1079,7 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct 
> > ip_vs_conn *cp,
> >     struct iphdr  *iph;                     /* Our new IP header */
> >     unsigned int max_headroom;              /* The extra header space 
> > needed */
> >     int ret, local;
> > +   int tun_type, gso_type;
> >  
> >     EnterFunction(10);
> >  
> > @@ -1046,6 +1101,16 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct 
> > ip_vs_conn *cp,
> >      */
> >     max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr);
> >  
> > +   tun_type = cp->dest->tun_type;
> > +
> > +   switch (tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +           max_headroom += sizeof(struct udphdr) + sizeof(struct guehdr);
> > +           break;
> > +   default:
> > +           break;
> > +   }
> > +
> >     /* We only care about the df field if sysctl_pmtu_disc(ipvs) is set */
> >     dfp = sysctl_pmtu_disc(ipvs) ? &df : NULL;
> >     skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom,
> > @@ -1054,11 +1119,30 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct 
> > ip_vs_conn *cp,
> >     if (IS_ERR(skb))
> >             goto tx_error;
> >  
> > -   if (iptunnel_handle_offloads(skb, __tun_gso_type_mask(AF_INET, cp->af)))
> > +   switch (tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +           gso_type = SKB_GSO_UDP_TUNNEL;
> > +           break;
> > +   default:
> > +           gso_type = __tun_gso_type_mask(AF_INET, cp->af);
> > +           break;
> > +   }
> > +
> > +   if (iptunnel_handle_offloads(skb, gso_type))
> >             goto tx_error;
> >  
> >     skb->transport_header = skb->network_header;
> >  
> > +   skb_set_inner_ipproto(skb, next_protocol);
> > +
> > +   switch (tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +           ipvs_gue_encap(net, skb, cp, &next_protocol);
> > +           break;
> > +   default:
> > +           break;
> > +   }
> > +
> >     skb_push(skb, sizeof(struct iphdr));
> >     skb_reset_network_header(skb);
> >     memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
> > @@ -1102,6 +1186,8 @@ int
> >  ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
> >                  struct ip_vs_protocol *pp, struct ip_vs_iphdr *ipvsh)
> >  {
> > +   struct netns_ipvs *ipvs = cp->ipvs;
> > +   struct net *net = ipvs->net;
> >     struct rt6_info *rt;            /* Route to the other host */
> >     struct in6_addr saddr;          /* Source for tunnel */
> >     struct net_device *tdev;        /* Device to other host */
> > @@ -1112,10 +1198,11 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct 
> > ip_vs_conn *cp,
> >     struct ipv6hdr  *iph;           /* Our new IP header */
> >     unsigned int max_headroom;      /* The extra header space needed */
> >     int ret, local;
> > +   int tun_type, gso_type;
> >  
> >     EnterFunction(10);
> >  
> > -   local = __ip_vs_get_out_rt_v6(cp->ipvs, cp->af, skb, cp->dest,
> > +   local = __ip_vs_get_out_rt_v6(ipvs, cp->af, skb, cp->dest,
> >                                   &cp->daddr.in6,
> >                                   &saddr, ipvsh, 1,
> >                                   IP_VS_RT_MODE_LOCAL |
> > @@ -1134,17 +1221,46 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct 
> > ip_vs_conn *cp,
> >      */
> >     max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr);
> >  
> > +   tun_type = cp->dest->tun_type;
> > +
> > +   switch (tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +           max_headroom += sizeof(struct udphdr) + sizeof(struct guehdr);
> > +           break;
> > +   default:
> > +           break;
> > +   }
> > +
> >     skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom,
> >                                      &next_protocol, &payload_len,
> >                                      &dsfield, &ttl, NULL);
> >     if (IS_ERR(skb))
> >             goto tx_error;
> >  
> > -   if (iptunnel_handle_offloads(skb, __tun_gso_type_mask(AF_INET6, 
> > cp->af)))
> > +   switch (tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +           gso_type = SKB_GSO_UDP_TUNNEL;
> > +           break;
> > +   default:
> > +           gso_type = __tun_gso_type_mask(AF_INET6, cp->af);
> > +           break;
> > +   }
> > +
> > +   if (iptunnel_handle_offloads(skb, gso_type))
> >             goto tx_error;
> >  
> >     skb->transport_header = skb->network_header;
> >  
> > +   skb_set_inner_ipproto(skb, next_protocol);
> > +
> > +   switch (tun_type) {
> > +   case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
> > +           ipvs_gue_encap(net, skb, cp, &next_protocol);
> > +           break;
> > +   default:
> > +           break;
> > +   }
> > +
> >     skb_push(skb, sizeof(struct ipv6hdr));
> >     skb_reset_network_header(skb);
> >     memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
> > @@ -1167,7 +1283,7 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct 
> > ip_vs_conn *cp,
> >  
> >     ret = ip_vs_tunnel_xmit_prepare(skb, cp);
> >     if (ret == NF_ACCEPT)
> > -           ip6_local_out(cp->ipvs->net, skb->sk, skb);
> > +           ip6_local_out(net, skb->sk, skb);
> >     else if (ret == NF_DROP)
> >             kfree_skb(skb);
> >  
> > -- 
> > 2.21.0
> > 

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