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On Mon, Jul 01, 2019 at 10:03:13PM +0300, Julian Anastasov wrote:
>
> Hello,
>
> Added CC to lvs-devel@xxxxxxxxxxxxxxx
>
> On Mon, 1 Jul 2019, Vadim Fedorenko wrote:
>
> > windows real servers can handle gre tunnels, this patch allows
> > gre encapsulation with the tunneling method, thereby letting ipvs
> > be load balancer for windows-based services
> >
> > Signed-off-by: Vadim Fedorenko <vfedorenko@xxxxxxxxxxxxxx>
>
> Looks good to me, thanks!
>
> Acked-by: Julian Anastasov <ja@xxxxxx>
Likewise,
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
Pablo, please consider including this in nf-next.
>
> > ---
> > v2: style fix
> > v3: change dest->tun_type checks to else if statement
> > ---
> > include/uapi/linux/ip_vs.h | 1 +
> > net/netfilter/ipvs/ip_vs_ctl.c | 1 +
> > net/netfilter/ipvs/ip_vs_xmit.c | 66
> > +++++++++++++++++++++++++++++++++++++++--
> > 3 files changed, 65 insertions(+), 3 deletions(-)
> >
> > diff --git a/include/uapi/linux/ip_vs.h b/include/uapi/linux/ip_vs.h
> > index e4f1806..4102ddc 100644
> > --- a/include/uapi/linux/ip_vs.h
> > +++ b/include/uapi/linux/ip_vs.h
> > @@ -128,6 +128,7 @@
> > enum {
> > IP_VS_CONN_F_TUNNEL_TYPE_IPIP = 0, /* IPIP */
> > IP_VS_CONN_F_TUNNEL_TYPE_GUE, /* GUE */
> > + IP_VS_CONN_F_TUNNEL_TYPE_GRE, /* GRE */
> > IP_VS_CONN_F_TUNNEL_TYPE_MAX,
> > };
> >
> > diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> > index 84384d8..998353b 100644
> > --- a/net/netfilter/ipvs/ip_vs_ctl.c
> > +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> > @@ -525,6 +525,7 @@ static void ip_vs_rs_hash(struct netns_ipvs *ipvs,
> > struct ip_vs_dest *dest)
> > port = dest->tun_port;
> > break;
> > case IP_VS_CONN_F_TUNNEL_TYPE_IPIP:
> > + case IP_VS_CONN_F_TUNNEL_TYPE_GRE:
> > port = 0;
> > break;
> > default:
> > diff --git a/net/netfilter/ipvs/ip_vs_xmit.c
> > b/net/netfilter/ipvs/ip_vs_xmit.c
> > index 71fc6d6..9c464d2 100644
> > --- a/net/netfilter/ipvs/ip_vs_xmit.c
> > +++ b/net/netfilter/ipvs/ip_vs_xmit.c
> > @@ -29,6 +29,7 @@
> > #include <linux/tcp.h> /* for tcphdr */
> > #include <net/ip.h>
> > #include <net/gue.h>
> > +#include <net/gre.h>
> > #include <net/tcp.h> /* for csum_tcpudp_magic */
> > #include <net/udp.h>
> > #include <net/icmp.h> /* for icmp_send */
> > @@ -388,6 +389,12 @@ static inline bool decrement_ttl(struct netns_ipvs
> > *ipvs,
> > IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
> > skb->ip_summed == CHECKSUM_PARTIAL)
> > mtu -= GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
> > + } else if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
> > + __be16 tflags = 0;
> > +
> > + if (dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
> > + tflags |= TUNNEL_CSUM;
> > + mtu -= gre_calc_hlen(tflags);
> > }
> > if (mtu < 68) {
> > IP_VS_DBG_RL("%s(): mtu less than 68\n", __func__);
> > @@ -548,6 +555,12 @@ static inline bool decrement_ttl(struct netns_ipvs
> > *ipvs,
> > IP_VS_TUNNEL_ENCAP_FLAG_REMCSUM) &&
> > skb->ip_summed == CHECKSUM_PARTIAL)
> > mtu -= GUE_PLEN_REMCSUM + GUE_LEN_PRIV;
> > + } else if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
> > + __be16 tflags = 0;
> > +
> > + if (dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
> > + tflags |= TUNNEL_CSUM;
> > + mtu -= gre_calc_hlen(tflags);
> > }
> > if (mtu < IPV6_MIN_MTU) {
> > IP_VS_DBG_RL("%s(): mtu less than %d\n", __func__,
> > @@ -1079,6 +1092,24 @@ static inline int __tun_gso_type_mask(int encaps_af,
> > int orig_af)
> > return 0;
> > }
> >
> > +static void
> > +ipvs_gre_encap(struct net *net, struct sk_buff *skb,
> > + struct ip_vs_conn *cp, __u8 *next_protocol)
> > +{
> > + __be16 proto = *next_protocol == IPPROTO_IPIP ?
> > + htons(ETH_P_IP) : htons(ETH_P_IPV6);
> > + __be16 tflags = 0;
> > + size_t hdrlen;
> > +
> > + if (cp->dest->tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
> > + tflags |= TUNNEL_CSUM;
> > +
> > + hdrlen = gre_calc_hlen(tflags);
> > + gre_build_header(skb, hdrlen, tflags, proto, 0, 0);
> > +
> > + *next_protocol = IPPROTO_GRE;
> > +}
> > +
> > /*
> > * IP Tunneling transmitter
> > *
> > @@ -1151,6 +1182,15 @@ static inline int __tun_gso_type_mask(int encaps_af,
> > int orig_af)
> > gue_hdrlen = sizeof(struct guehdr) + gue_optlen;
> >
> > max_headroom += sizeof(struct udphdr) + gue_hdrlen;
> > + } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
> > + size_t gre_hdrlen;
> > + __be16 tflags = 0;
> > +
> > + if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
> > + tflags |= TUNNEL_CSUM;
> > + gre_hdrlen = gre_calc_hlen(tflags);
> > +
> > + max_headroom += gre_hdrlen;
> > }
> >
> > /* We only care about the df field if sysctl_pmtu_disc(ipvs) is set */
> > @@ -1172,6 +1212,11 @@ static inline int __tun_gso_type_mask(int encaps_af,
> > int orig_af)
> > skb->ip_summed == CHECKSUM_PARTIAL) {
> > gso_type |= SKB_GSO_TUNNEL_REMCSUM;
> > }
> > + } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
> > + if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
> > + gso_type |= SKB_GSO_GRE_CSUM;
> > + else
> > + gso_type |= SKB_GSO_GRE;
> > }
> >
> > if (iptunnel_handle_offloads(skb, gso_type))
> > @@ -1192,8 +1237,8 @@ static inline int __tun_gso_type_mask(int encaps_af,
> > int orig_af)
> > check = true;
> >
> > udp_set_csum(!check, skb, saddr, cp->daddr.ip, skb->len);
> > - }
> > -
> > + } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE)
> > + ipvs_gre_encap(net, skb, cp, &next_protocol);
> >
> > skb_push(skb, sizeof(struct iphdr));
> > skb_reset_network_header(skb);
> > @@ -1287,6 +1332,15 @@ static inline int __tun_gso_type_mask(int encaps_af,
> > int orig_af)
> > gue_hdrlen = sizeof(struct guehdr) + gue_optlen;
> >
> > max_headroom += sizeof(struct udphdr) + gue_hdrlen;
> > + } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
> > + size_t gre_hdrlen;
> > + __be16 tflags = 0;
> > +
> > + if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
> > + tflags |= TUNNEL_CSUM;
> > + gre_hdrlen = gre_calc_hlen(tflags);
> > +
> > + max_headroom += gre_hdrlen;
> > }
> >
> > skb = ip_vs_prepare_tunneled_skb(skb, cp->af, max_headroom,
> > @@ -1306,6 +1360,11 @@ static inline int __tun_gso_type_mask(int encaps_af,
> > int orig_af)
> > skb->ip_summed == CHECKSUM_PARTIAL) {
> > gso_type |= SKB_GSO_TUNNEL_REMCSUM;
> > }
> > + } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
> > + if (tun_flags & IP_VS_TUNNEL_ENCAP_FLAG_CSUM)
> > + gso_type |= SKB_GSO_GRE_CSUM;
> > + else
> > + gso_type |= SKB_GSO_GRE;
> > }
> >
> > if (iptunnel_handle_offloads(skb, gso_type))
> > @@ -1326,7 +1385,8 @@ static inline int __tun_gso_type_mask(int encaps_af,
> > int orig_af)
> > check = true;
> >
> > udp6_set_csum(!check, skb, &saddr, &cp->daddr.in6, skb->len);
> > - }
> > + } else if (tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE)
> > + ipvs_gre_encap(net, skb, cp, &next_protocol);
> >
> > skb_push(skb, sizeof(struct ipv6hdr));
> > skb_reset_network_header(skb);
> > --
> > 1.9.1
>
> Regards
>
> --
> Julian Anastasov <ja@xxxxxx>
>
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