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[209.132.180.67]) by mx.google.com with ESMTP id t5si4788402pgu.517.2019.03.21.13.31.55; Thu, 21 Mar 2019 13:32:10 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729051AbfCUU3z (ORCPT + 99 others); Thu, 21 Mar 2019 16:29:55 -0400 Received: from ja.ssi.bg ([178.16.129.10]:35054 "EHLO ja.ssi.bg" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1728817AbfCUU3y (ORCPT ); Thu, 21 Mar 2019 16:29:54 -0400 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by ja.ssi.bg (8.15.2/8.15.2) with ESMTP id x2LKSR5Y018216; Thu, 21 Mar 2019 22:28:27 +0200 Date: Thu, 21 Mar 2019 22:28:27 +0200 (EET) From: Julian Anastasov To: Jacky Hu cc: jacky.hu@walmart.com, jason.niesz@walmart.com, "David S. Miller" , Alexey Kuznetsov , Hideaki YOSHIFUJI , Wensong Zhang , Simon Horman , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , netdev@vger.kernel.org, lvs-devel@vger.kernel.org, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org Subject: Re: [PATCH v5] ipvs: allow tunneling with gue encapsulation In-Reply-To: <20190319052656.23933-1-hengqing.hu@gmail.com> Message-ID: References: <20190319052656.23933-1-hengqing.hu@gmail.com> User-Agent: Alpine 2.21 (LFD 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Tue, 19 Mar 2019, 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 The patch looks good to me, thanks! Acked-by: Julian Anastasov I plan to add the needed ICMP-error support for the new tunnel type in the following days, as a followup patch. > --- > 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: > + 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 > #include /* for tcphdr */ > #include > +#include > #include /* for csum_tcpudp_magic */ > #include > #include /* 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 Regards -- Julian Anastasov