From 4565e9919cda747815547e2e5d7b78f15efbffdf Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Wed, 17 Sep 2014 12:26:01 -0700 Subject: [PATCH] gre: Setup and TX path for gre/UDP foo-over-udp encapsulation Added netlink attrs to configure FOU encapsulation for GRE, netlink handling of these flags, and properly adjust MTU for encapsulation. ip_tunnel_encap is called from ip_tunnel_xmit to actually perform FOU encapsulation. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- include/uapi/linux/if_tunnel.h | 4 ++ net/ipv4/ip_gre.c | 90 ++++++++++++++++++++++++++++++++-- 2 files changed, 89 insertions(+), 5 deletions(-) diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h index 9fedca7d8dae..7c832afdfa94 100644 --- a/include/uapi/linux/if_tunnel.h +++ b/include/uapi/linux/if_tunnel.h @@ -106,6 +106,10 @@ enum { IFLA_GRE_ENCAP_LIMIT, IFLA_GRE_FLOWINFO, IFLA_GRE_FLAGS, + IFLA_GRE_ENCAP_TYPE, + IFLA_GRE_ENCAP_FLAGS, + IFLA_GRE_ENCAP_SPORT, + IFLA_GRE_ENCAP_DPORT, __IFLA_GRE_MAX, }; diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 9b842544aea3..829aff8bf723 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -239,7 +239,7 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, tpi.seq = htonl(tunnel->o_seqno); /* Push GRE header. */ - gre_build_header(skb, &tpi, tunnel->hlen); + gre_build_header(skb, &tpi, tunnel->tun_hlen); ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); } @@ -310,7 +310,7 @@ out: static int ipgre_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) { - int err = 0; + int err; struct ip_tunnel_parm p; if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) @@ -470,13 +470,18 @@ static void ipgre_tunnel_setup(struct net_device *dev) static void __gre_tunnel_init(struct net_device *dev) { struct ip_tunnel *tunnel; + int t_hlen; tunnel = netdev_priv(dev); - tunnel->hlen = ip_gre_calc_hlen(tunnel->parms.o_flags); + tunnel->tun_hlen = ip_gre_calc_hlen(tunnel->parms.o_flags); tunnel->parms.iph.protocol = IPPROTO_GRE; - dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; - dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; + tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; + + t_hlen = tunnel->hlen + sizeof(struct iphdr); + + dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4; + dev->mtu = ETH_DATA_LEN - t_hlen - 4; dev->features |= GRE_FEATURES; dev->hw_features |= GRE_FEATURES; @@ -628,6 +633,40 @@ static void ipgre_netlink_parms(struct nlattr *data[], struct nlattr *tb[], parms->iph.frag_off = htons(IP_DF); } +/* This function returns true when ENCAP attributes are present in the nl msg */ +static bool ipgre_netlink_encap_parms(struct nlattr *data[], + struct ip_tunnel_encap *ipencap) +{ + bool ret = false; + + memset(ipencap, 0, sizeof(*ipencap)); + + if (!data) + return ret; + + if (data[IFLA_GRE_ENCAP_TYPE]) { + ret = true; + ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]); + } + + if (data[IFLA_GRE_ENCAP_FLAGS]) { + ret = true; + ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]); + } + + if (data[IFLA_GRE_ENCAP_SPORT]) { + ret = true; + ipencap->sport = nla_get_u16(data[IFLA_GRE_ENCAP_SPORT]); + } + + if (data[IFLA_GRE_ENCAP_DPORT]) { + ret = true; + ipencap->dport = nla_get_u16(data[IFLA_GRE_ENCAP_DPORT]); + } + + return ret; +} + static int gre_tap_init(struct net_device *dev) { __gre_tunnel_init(dev); @@ -657,6 +696,15 @@ static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct ip_tunnel_parm p; + struct ip_tunnel_encap ipencap; + + if (ipgre_netlink_encap_parms(data, &ipencap)) { + struct ip_tunnel *t = netdev_priv(dev); + int err = ip_tunnel_encap_setup(t, &ipencap); + + if (err < 0) + return err; + } ipgre_netlink_parms(data, tb, &p); return ip_tunnel_newlink(dev, tb, &p); @@ -666,6 +714,15 @@ static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { struct ip_tunnel_parm p; + struct ip_tunnel_encap ipencap; + + if (ipgre_netlink_encap_parms(data, &ipencap)) { + struct ip_tunnel *t = netdev_priv(dev); + int err = ip_tunnel_encap_setup(t, &ipencap); + + if (err < 0) + return err; + } ipgre_netlink_parms(data, tb, &p); return ip_tunnel_changelink(dev, tb, &p); @@ -694,6 +751,14 @@ static size_t ipgre_get_size(const struct net_device *dev) nla_total_size(1) + /* IFLA_GRE_PMTUDISC */ nla_total_size(1) + + /* IFLA_GRE_ENCAP_TYPE */ + nla_total_size(2) + + /* IFLA_GRE_ENCAP_FLAGS */ + nla_total_size(2) + + /* IFLA_GRE_ENCAP_SPORT */ + nla_total_size(2) + + /* IFLA_GRE_ENCAP_DPORT */ + nla_total_size(2) + 0; } @@ -714,6 +779,17 @@ static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) nla_put_u8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF)))) goto nla_put_failure; + + if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, + t->encap.type) || + nla_put_u16(skb, IFLA_GRE_ENCAP_SPORT, + t->encap.sport) || + nla_put_u16(skb, IFLA_GRE_ENCAP_DPORT, + t->encap.dport) || + nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS, + t->encap.dport)) + goto nla_put_failure; + return 0; nla_put_failure: @@ -731,6 +807,10 @@ static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { [IFLA_GRE_TTL] = { .type = NLA_U8 }, [IFLA_GRE_TOS] = { .type = NLA_U8 }, [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, + [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 }, + [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, + [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, + [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, }; static struct rtnl_link_ops ipgre_link_ops __read_mostly = {