From 0a473b82cb23e7a35c4be6e9765c8487a65e8f55 Mon Sep 17 00:00:00 2001 From: Craig Gallek Date: Wed, 19 Apr 2017 12:30:53 -0400 Subject: [PATCH] ip6_tunnel: Allow policy-based routing through tunnels This feature allows the administrator to set an fwmark for packets traversing a tunnel. This allows the use of independent routing tables for tunneled packets without the use of iptables. Signed-off-by: Craig Gallek Signed-off-by: David S. Miller --- include/net/ip6_tunnel.h | 2 ++ include/uapi/linux/if_tunnel.h | 3 +++ net/ipv6/ip6_gre.c | 14 +++++++++++++- net/ipv6/ip6_tunnel.c | 15 ++++++++++++++- net/ipv6/ip6_vti.c | 10 +++++++++- 5 files changed, 41 insertions(+), 3 deletions(-) diff --git a/include/net/ip6_tunnel.h b/include/net/ip6_tunnel.h index 1b1cf33cbfb0..08fbc7f7d8d7 100644 --- a/include/net/ip6_tunnel.h +++ b/include/net/ip6_tunnel.h @@ -33,6 +33,8 @@ struct __ip6_tnl_parm { __be16 o_flags; __be32 i_key; __be32 o_key; + + __u32 fwmark; }; /* IPv6 tunnel */ diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h index 92f3c8677523..6792d1967d31 100644 --- a/include/uapi/linux/if_tunnel.h +++ b/include/uapi/linux/if_tunnel.h @@ -75,6 +75,7 @@ enum { IFLA_IPTUN_ENCAP_SPORT, IFLA_IPTUN_ENCAP_DPORT, IFLA_IPTUN_COLLECT_METADATA, + IFLA_IPTUN_FWMARK, __IFLA_IPTUN_MAX, }; #define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1) @@ -132,6 +133,7 @@ enum { IFLA_GRE_ENCAP_DPORT, IFLA_GRE_COLLECT_METADATA, IFLA_GRE_IGNORE_DF, + IFLA_GRE_FWMARK, __IFLA_GRE_MAX, }; @@ -147,6 +149,7 @@ enum { IFLA_VTI_OKEY, IFLA_VTI_LOCAL, IFLA_VTI_REMOTE, + IFLA_VTI_FWMARK, __IFLA_VTI_MAX, }; diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index 6fcb7cb49bb2..8d128ba79b66 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -544,6 +544,8 @@ static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev) & IPV6_TCLASS_MASK; if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) fl6.flowi6_mark = skb->mark; + else + fl6.flowi6_mark = t->parms.fwmark; fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); @@ -603,6 +605,8 @@ static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev) fl6.flowlabel |= ip6_flowlabel(ipv6h); if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) fl6.flowi6_mark = skb->mark; + else + fl6.flowi6_mark = t->parms.fwmark; fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); @@ -780,6 +784,7 @@ static int ip6gre_tnl_change(struct ip6_tnl *t, t->parms.o_key = p->o_key; t->parms.i_flags = p->i_flags; t->parms.o_flags = p->o_flags; + t->parms.fwmark = p->fwmark; dst_cache_reset(&t->dst_cache); ip6gre_tnl_link_config(t, set_mtu); return 0; @@ -1249,6 +1254,9 @@ static void ip6gre_netlink_parms(struct nlattr *data[], if (data[IFLA_GRE_FLAGS]) parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]); + + if (data[IFLA_GRE_FWMARK]) + parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]); } static int ip6gre_tap_init(struct net_device *dev) @@ -1470,6 +1478,8 @@ static size_t ip6gre_get_size(const struct net_device *dev) nla_total_size(2) + /* IFLA_GRE_ENCAP_DPORT */ nla_total_size(2) + + /* IFLA_GRE_FWMARK */ + nla_total_size(4) + 0; } @@ -1490,7 +1500,8 @@ static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev) nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) || nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) || nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) || - nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags)) + nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) || + nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark)) goto nla_put_failure; if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE, @@ -1525,6 +1536,7 @@ static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = { [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 }, [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 }, [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 }, + [IFLA_GRE_FWMARK] = { .type = NLA_U32 }, }; static struct rtnl_link_ops ip6gre_link_ops __read_mostly = { diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 75fac933c209..ad15d38b41e8 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -1256,6 +1256,8 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) & IPV6_TCLASS_MASK; if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) fl6.flowi6_mark = skb->mark; + else + fl6.flowi6_mark = t->parms.fwmark; } fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); @@ -1338,6 +1340,8 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) fl6.flowlabel |= ip6_flowlabel(ipv6h); if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) fl6.flowi6_mark = skb->mark; + else + fl6.flowi6_mark = t->parms.fwmark; } fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); @@ -1467,6 +1471,7 @@ ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) t->parms.flowinfo = p->flowinfo; t->parms.link = p->link; t->parms.proto = p->proto; + t->parms.fwmark = p->fwmark; dst_cache_reset(&t->dst_cache); ip6_tnl_link_config(t); return 0; @@ -1918,6 +1923,9 @@ static void ip6_tnl_netlink_parms(struct nlattr *data[], if (data[IFLA_IPTUN_COLLECT_METADATA]) parms->collect_md = true; + + if (data[IFLA_IPTUN_FWMARK]) + parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); } static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], @@ -2054,6 +2062,8 @@ static size_t ip6_tnl_get_size(const struct net_device *dev) nla_total_size(2) + /* IFLA_IPTUN_COLLECT_METADATA */ nla_total_size(0) + + /* IFLA_IPTUN_FWMARK */ + nla_total_size(4) + 0; } @@ -2069,7 +2079,8 @@ static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || - nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) + nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || + nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) goto nla_put_failure; if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || @@ -2081,6 +2092,7 @@ static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) if (parm->collect_md) if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) goto nla_put_failure; + return 0; nla_put_failure: @@ -2109,6 +2121,7 @@ static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, + [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, }; static struct rtnl_link_ops ip6_link_ops __read_mostly = { diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c index 3d8a3b63b4fd..d67ef56454b2 100644 --- a/net/ipv6/ip6_vti.c +++ b/net/ipv6/ip6_vti.c @@ -657,6 +657,7 @@ vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) t->parms.i_key = p->i_key; t->parms.o_key = p->o_key; t->parms.proto = p->proto; + t->parms.fwmark = p->fwmark; dst_cache_reset(&t->dst_cache); vti6_link_config(t); return 0; @@ -933,6 +934,9 @@ static void vti6_netlink_parms(struct nlattr *data[], if (data[IFLA_VTI_OKEY]) parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); + + if (data[IFLA_VTI_FWMARK]) + parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); } static int vti6_newlink(struct net *src_net, struct net_device *dev, @@ -998,6 +1002,8 @@ static size_t vti6_get_size(const struct net_device *dev) nla_total_size(4) + /* IFLA_VTI_OKEY */ nla_total_size(4) + + /* IFLA_VTI_FWMARK */ + nla_total_size(4) + 0; } @@ -1010,7 +1016,8 @@ static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev) nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) || nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) || nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) || - nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key)) + nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) || + nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark)) goto nla_put_failure; return 0; @@ -1024,6 +1031,7 @@ static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = { [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) }, [IFLA_VTI_IKEY] = { .type = NLA_U32 }, [IFLA_VTI_OKEY] = { .type = NLA_U32 }, + [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, }; static struct rtnl_link_ops vti6_link_ops __read_mostly = { -- 2.11.0