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500 lines
15 KiB
500 lines
15 KiB
From: Steven Barth <steven@midlink.org>
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Subject: Add support for MAP-E FMRs (mesh mode)
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MAP-E FMRs (draft-ietf-softwire-map-10) are rules for IPv4-communication
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between MAP CEs (mesh mode) without the need to forward such data to a
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border relay. This is similar to how 6rd works but for IPv4 over IPv6.
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Signed-off-by: Steven Barth <cyrus@openwrt.org>
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---
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include/net/ip6_tunnel.h | 13 ++
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include/uapi/linux/if_tunnel.h | 13 ++
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net/ipv6/ip6_tunnel.c | 276 +++++++++++++++++++++++++++++++++++++++--
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3 files changed, 291 insertions(+), 11 deletions(-)
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--- a/include/net/ip6_tunnel.h
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+++ b/include/net/ip6_tunnel.h
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@@ -18,6 +18,18 @@
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/* determine capability on a per-packet basis */
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#define IP6_TNL_F_CAP_PER_PACKET 0x40000
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+/* IPv6 tunnel FMR */
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+struct __ip6_tnl_fmr {
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+ struct __ip6_tnl_fmr *next; /* next fmr in list */
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+ struct in6_addr ip6_prefix;
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+ struct in_addr ip4_prefix;
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+
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+ __u8 ip6_prefix_len;
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+ __u8 ip4_prefix_len;
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+ __u8 ea_len;
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+ __u8 offset;
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+};
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+
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struct __ip6_tnl_parm {
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char name[IFNAMSIZ]; /* name of tunnel device */
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int link; /* ifindex of underlying L2 interface */
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@@ -29,6 +41,7 @@ struct __ip6_tnl_parm {
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__u32 flags; /* tunnel flags */
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struct in6_addr laddr; /* local tunnel end-point address */
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struct in6_addr raddr; /* remote tunnel end-point address */
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+ struct __ip6_tnl_fmr *fmrs; /* FMRs */
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__be16 i_flags;
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__be16 o_flags;
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--- a/include/uapi/linux/if_tunnel.h
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+++ b/include/uapi/linux/if_tunnel.h
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@@ -77,10 +77,23 @@ enum {
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IFLA_IPTUN_ENCAP_DPORT,
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IFLA_IPTUN_COLLECT_METADATA,
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IFLA_IPTUN_FWMARK,
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+ IFLA_IPTUN_FMRS,
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__IFLA_IPTUN_MAX,
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};
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#define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1)
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+enum {
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+ IFLA_IPTUN_FMR_UNSPEC,
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+ IFLA_IPTUN_FMR_IP6_PREFIX,
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+ IFLA_IPTUN_FMR_IP4_PREFIX,
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+ IFLA_IPTUN_FMR_IP6_PREFIX_LEN,
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+ IFLA_IPTUN_FMR_IP4_PREFIX_LEN,
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+ IFLA_IPTUN_FMR_EA_LEN,
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+ IFLA_IPTUN_FMR_OFFSET,
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+ __IFLA_IPTUN_FMR_MAX,
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+};
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+#define IFLA_IPTUN_FMR_MAX (__IFLA_IPTUN_FMR_MAX - 1)
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+
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enum tunnel_encap_types {
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TUNNEL_ENCAP_NONE,
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TUNNEL_ENCAP_FOU,
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--- a/net/ipv6/ip6_tunnel.c
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+++ b/net/ipv6/ip6_tunnel.c
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@@ -16,6 +16,8 @@
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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+ * Changes:
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+ * Steven Barth <cyrus@openwrt.org>: MAP-E FMR support
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@@ -72,9 +74,9 @@ static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
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-static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
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+static u32 HASH(const struct in6_addr *addr)
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{
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- u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
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+ u32 hash = ipv6_addr_hash(addr);
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return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
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}
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@@ -141,20 +143,29 @@ static struct net_device_stats *ip6_get_
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static struct ip6_tnl *
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ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
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{
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- unsigned int hash = HASH(remote, local);
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+ unsigned int hash = HASH(local);
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struct ip6_tnl *t;
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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struct in6_addr any;
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+ struct __ip6_tnl_fmr *fmr;
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for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
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- if (ipv6_addr_equal(local, &t->parms.laddr) &&
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- ipv6_addr_equal(remote, &t->parms.raddr) &&
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- (t->dev->flags & IFF_UP))
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+ if (!ipv6_addr_equal(local, &t->parms.laddr) ||
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+ !(t->dev->flags & IFF_UP))
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+ continue;
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+
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+ if (ipv6_addr_equal(remote, &t->parms.raddr))
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return t;
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+
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+ for (fmr = t->parms.fmrs; fmr; fmr = fmr->next) {
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+ if (ipv6_prefix_equal(remote, &fmr->ip6_prefix,
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+ fmr->ip6_prefix_len))
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+ return t;
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+ }
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}
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memset(&any, 0, sizeof(any));
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- hash = HASH(&any, local);
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+ hash = HASH(local);
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for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
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if (ipv6_addr_equal(local, &t->parms.laddr) &&
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ipv6_addr_any(&t->parms.raddr) &&
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@@ -162,7 +173,7 @@ ip6_tnl_lookup(struct net *net, const st
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return t;
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}
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- hash = HASH(remote, &any);
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+ hash = HASH(&any);
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for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
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if (ipv6_addr_equal(remote, &t->parms.raddr) &&
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ipv6_addr_any(&t->parms.laddr) &&
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@@ -202,7 +213,7 @@ ip6_tnl_bucket(struct ip6_tnl_net *ip6n,
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if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
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prio = 1;
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- h = HASH(remote, local);
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+ h = HASH(local);
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}
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return &ip6n->tnls[prio][h];
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}
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@@ -380,6 +391,12 @@ ip6_tnl_dev_uninit(struct net_device *de
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struct net *net = t->net;
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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+ while (t->parms.fmrs) {
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+ struct __ip6_tnl_fmr *next = t->parms.fmrs->next;
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+ kfree(t->parms.fmrs);
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+ t->parms.fmrs = next;
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+ }
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+
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if (dev == ip6n->fb_tnl_dev)
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RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
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else
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@@ -776,6 +793,107 @@ int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
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}
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EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
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+/**
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+ * ip4ip6_fmr_calc - calculate target / source IPv6-address based on FMR
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+ * @dest: destination IPv6 address buffer
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+ * @skb: received socket buffer
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+ * @fmr: MAP FMR
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+ * @xmit: Calculate for xmit or rcv
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+ **/
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+static void ip4ip6_fmr_calc(struct in6_addr *dest,
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+ const struct iphdr *iph, const uint8_t *end,
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+ const struct __ip6_tnl_fmr *fmr, bool xmit)
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+{
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+ int psidlen = fmr->ea_len - (32 - fmr->ip4_prefix_len);
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+ u8 *portp = NULL;
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+ bool use_dest_addr;
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+ const struct iphdr *dsth = iph;
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+
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+ if ((u8*)dsth >= end)
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+ return;
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+
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+ /* find significant IP header */
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+ if (iph->protocol == IPPROTO_ICMP) {
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+ struct icmphdr *ih = (struct icmphdr*)(((u8*)dsth) + dsth->ihl * 4);
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+ if (ih && ((u8*)&ih[1]) <= end && (
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+ ih->type == ICMP_DEST_UNREACH ||
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+ ih->type == ICMP_SOURCE_QUENCH ||
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+ ih->type == ICMP_TIME_EXCEEDED ||
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+ ih->type == ICMP_PARAMETERPROB ||
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+ ih->type == ICMP_REDIRECT))
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+ dsth = (const struct iphdr*)&ih[1];
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+ }
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+
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+ /* in xmit-path use dest port by default and source port only if
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+ this is an ICMP reply to something else; vice versa in rcv-path */
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+ use_dest_addr = (xmit && dsth == iph) || (!xmit && dsth != iph);
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+
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+ /* get dst port */
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+ if (((u8*)&dsth[1]) <= end && (
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+ dsth->protocol == IPPROTO_UDP ||
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+ dsth->protocol == IPPROTO_TCP ||
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+ dsth->protocol == IPPROTO_SCTP ||
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+ dsth->protocol == IPPROTO_DCCP)) {
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+ /* for UDP, TCP, SCTP and DCCP source and dest port
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+ follow IPv4 header directly */
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+ portp = ((u8*)dsth) + dsth->ihl * 4;
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+
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+ if (use_dest_addr)
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+ portp += sizeof(u16);
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+ } else if (iph->protocol == IPPROTO_ICMP) {
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+ struct icmphdr *ih = (struct icmphdr*)(((u8*)dsth) + dsth->ihl * 4);
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+
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+ /* use icmp identifier as port */
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+ if (((u8*)&ih) <= end && (
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+ (use_dest_addr && (
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+ ih->type == ICMP_ECHOREPLY ||
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+ ih->type == ICMP_TIMESTAMPREPLY ||
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+ ih->type == ICMP_INFO_REPLY ||
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+ ih->type == ICMP_ADDRESSREPLY)) ||
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+ (!use_dest_addr && (
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+ ih->type == ICMP_ECHO ||
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+ ih->type == ICMP_TIMESTAMP ||
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+ ih->type == ICMP_INFO_REQUEST ||
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+ ih->type == ICMP_ADDRESS)
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+ )))
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+ portp = (u8*)&ih->un.echo.id;
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+ }
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+
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+ if ((portp && &portp[2] <= end) || psidlen == 0) {
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+ int frombyte = fmr->ip6_prefix_len / 8;
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+ int fromrem = fmr->ip6_prefix_len % 8;
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+ int bytes = sizeof(struct in6_addr) - frombyte;
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+ const u32 *addr = (use_dest_addr) ? &iph->daddr : &iph->saddr;
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+ u64 eabits = ((u64)ntohl(*addr)) << (32 + fmr->ip4_prefix_len);
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+ u64 t = 0;
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+
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+ /* extract PSID from port and add it to eabits */
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+ u16 psidbits = 0;
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+ if (psidlen > 0) {
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+ psidbits = ((u16)portp[0]) << 8 | ((u16)portp[1]);
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+ psidbits >>= 16 - psidlen - fmr->offset;
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+ psidbits = (u16)(psidbits << (16 - psidlen));
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+ eabits |= ((u64)psidbits) << (48 - (fmr->ea_len - psidlen));
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+ }
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+
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+ /* rewrite destination address */
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+ *dest = fmr->ip6_prefix;
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+ memcpy(&dest->s6_addr[10], addr, sizeof(*addr));
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+ dest->s6_addr16[7] = htons(psidbits >> (16 - psidlen));
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+
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+ if (bytes > sizeof(u64))
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+ bytes = sizeof(u64);
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+
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+ /* insert eabits */
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+ memcpy(&t, &dest->s6_addr[frombyte], bytes);
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+ t = be64_to_cpu(t) & ~(((((u64)1) << fmr->ea_len) - 1)
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+ << (64 - fmr->ea_len - fromrem));
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+ t = cpu_to_be64(t | (eabits >> fromrem));
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+ memcpy(&dest->s6_addr[frombyte], &t, bytes);
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+ }
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+}
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+
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+
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static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
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const struct tnl_ptk_info *tpi,
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struct metadata_dst *tun_dst,
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@@ -828,6 +946,27 @@ static int __ip6_tnl_rcv(struct ip6_tnl
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skb_reset_network_header(skb);
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memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
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+ if (tpi->proto == htons(ETH_P_IP) &&
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+ !ipv6_addr_equal(&ipv6h->saddr, &tunnel->parms.raddr)) {
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+ /* Packet didn't come from BR, so lookup FMR */
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+ struct __ip6_tnl_fmr *fmr;
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+ struct in6_addr expected = tunnel->parms.raddr;
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+ for (fmr = tunnel->parms.fmrs; fmr; fmr = fmr->next)
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+ if (ipv6_prefix_equal(&ipv6h->saddr,
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+ &fmr->ip6_prefix, fmr->ip6_prefix_len))
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+ break;
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+
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+ /* Check that IPv6 matches IPv4 source to prevent spoofing */
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+ if (fmr)
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+ ip4ip6_fmr_calc(&expected, ip_hdr(skb),
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+ skb_tail_pointer(skb), fmr, false);
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+
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+ if (!ipv6_addr_equal(&ipv6h->saddr, &expected)) {
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+ rcu_read_unlock();
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+ goto drop;
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+ }
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+ }
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+
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__skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
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err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
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@@ -959,6 +1098,7 @@ static void init_tel_txopt(struct ipv6_t
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opt->ops.opt_nflen = 8;
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}
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+
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/**
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* ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
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* @t: the outgoing tunnel device
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@@ -1301,6 +1441,7 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, str
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct ipv6hdr *ipv6h = ipv6_hdr(skb);
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+ struct __ip6_tnl_fmr *fmr;
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int encap_limit = -1;
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__u16 offset;
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struct flowi6 fl6;
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@@ -1363,6 +1504,18 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, str
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fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
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+ /* try to find matching FMR */
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+ for (fmr = t->parms.fmrs; fmr; fmr = fmr->next) {
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+ unsigned mshift = 32 - fmr->ip4_prefix_len;
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+ if (ntohl(fmr->ip4_prefix.s_addr) >> mshift ==
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+ ntohl(ip_hdr(skb)->daddr) >> mshift)
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+ break;
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+ }
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+
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+ /* change dstaddr according to FMR */
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+ if (fmr)
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+ ip4ip6_fmr_calc(&fl6.daddr, ip_hdr(skb), skb_tail_pointer(skb), fmr, true);
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+
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if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
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return -1;
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@@ -1491,6 +1644,14 @@ ip6_tnl_change(struct ip6_tnl *t, const
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t->parms.link = p->link;
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t->parms.proto = p->proto;
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t->parms.fwmark = p->fwmark;
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+
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+ while (t->parms.fmrs) {
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+ struct __ip6_tnl_fmr *next = t->parms.fmrs->next;
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+ kfree(t->parms.fmrs);
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+ t->parms.fmrs = next;
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+ }
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+ t->parms.fmrs = p->fmrs;
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+
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dst_cache_reset(&t->dst_cache);
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ip6_tnl_link_config(t);
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return 0;
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@@ -1529,6 +1690,7 @@ ip6_tnl_parm_from_user(struct __ip6_tnl_
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p->flowinfo = u->flowinfo;
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p->link = u->link;
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p->proto = u->proto;
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+ p->fmrs = NULL;
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memcpy(p->name, u->name, sizeof(u->name));
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}
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@@ -1910,6 +2072,15 @@ static int ip6_tnl_validate(struct nlatt
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return 0;
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}
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+static const struct nla_policy ip6_tnl_fmr_policy[IFLA_IPTUN_FMR_MAX + 1] = {
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+ [IFLA_IPTUN_FMR_IP6_PREFIX] = { .len = sizeof(struct in6_addr) },
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+ [IFLA_IPTUN_FMR_IP4_PREFIX] = { .len = sizeof(struct in_addr) },
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+ [IFLA_IPTUN_FMR_IP6_PREFIX_LEN] = { .type = NLA_U8 },
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+ [IFLA_IPTUN_FMR_IP4_PREFIX_LEN] = { .type = NLA_U8 },
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+ [IFLA_IPTUN_FMR_EA_LEN] = { .type = NLA_U8 },
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+ [IFLA_IPTUN_FMR_OFFSET] = { .type = NLA_U8 }
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+};
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+
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static void ip6_tnl_netlink_parms(struct nlattr *data[],
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struct __ip6_tnl_parm *parms)
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{
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@@ -1947,6 +2118,46 @@ static void ip6_tnl_netlink_parms(struct
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if (data[IFLA_IPTUN_FWMARK])
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parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
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+
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+ if (data[IFLA_IPTUN_FMRS]) {
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+ unsigned rem;
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+ struct nlattr *fmr;
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+ nla_for_each_nested(fmr, data[IFLA_IPTUN_FMRS], rem) {
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+ struct nlattr *fmrd[IFLA_IPTUN_FMR_MAX + 1], *c;
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+ struct __ip6_tnl_fmr *nfmr;
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+
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+ nla_parse_nested(fmrd, IFLA_IPTUN_FMR_MAX,
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+ fmr, ip6_tnl_fmr_policy, NULL);
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+
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+ if (!(nfmr = kzalloc(sizeof(*nfmr), GFP_KERNEL)))
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+ continue;
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+
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+ nfmr->offset = 6;
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+
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+ if ((c = fmrd[IFLA_IPTUN_FMR_IP6_PREFIX]))
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+ nla_memcpy(&nfmr->ip6_prefix, fmrd[IFLA_IPTUN_FMR_IP6_PREFIX],
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+ sizeof(nfmr->ip6_prefix));
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+
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+ if ((c = fmrd[IFLA_IPTUN_FMR_IP4_PREFIX]))
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+ nla_memcpy(&nfmr->ip4_prefix, fmrd[IFLA_IPTUN_FMR_IP4_PREFIX],
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+ sizeof(nfmr->ip4_prefix));
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+
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+ if ((c = fmrd[IFLA_IPTUN_FMR_IP6_PREFIX_LEN]))
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+ nfmr->ip6_prefix_len = nla_get_u8(c);
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+
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+ if ((c = fmrd[IFLA_IPTUN_FMR_IP4_PREFIX_LEN]))
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+ nfmr->ip4_prefix_len = nla_get_u8(c);
|
|
+
|
|
+ if ((c = fmrd[IFLA_IPTUN_FMR_EA_LEN]))
|
|
+ nfmr->ea_len = nla_get_u8(c);
|
|
+
|
|
+ if ((c = fmrd[IFLA_IPTUN_FMR_OFFSET]))
|
|
+ nfmr->offset = nla_get_u8(c);
|
|
+
|
|
+ nfmr->next = parms->fmrs;
|
|
+ parms->fmrs = nfmr;
|
|
+ }
|
|
+ }
|
|
}
|
|
|
|
static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
|
|
@@ -2058,6 +2269,12 @@ static void ip6_tnl_dellink(struct net_d
|
|
|
|
static size_t ip6_tnl_get_size(const struct net_device *dev)
|
|
{
|
|
+ const struct ip6_tnl *t = netdev_priv(dev);
|
|
+ struct __ip6_tnl_fmr *c;
|
|
+ int fmrs = 0;
|
|
+ for (c = t->parms.fmrs; c; c = c->next)
|
|
+ ++fmrs;
|
|
+
|
|
return
|
|
/* IFLA_IPTUN_LINK */
|
|
nla_total_size(4) +
|
|
@@ -2087,6 +2304,24 @@ static size_t ip6_tnl_get_size(const str
|
|
nla_total_size(0) +
|
|
/* IFLA_IPTUN_FWMARK */
|
|
nla_total_size(4) +
|
|
+ /* IFLA_IPTUN_FMRS */
|
|
+ nla_total_size(0) +
|
|
+ (
|
|
+ /* nest */
|
|
+ nla_total_size(0) +
|
|
+ /* IFLA_IPTUN_FMR_IP6_PREFIX */
|
|
+ nla_total_size(sizeof(struct in6_addr)) +
|
|
+ /* IFLA_IPTUN_FMR_IP4_PREFIX */
|
|
+ nla_total_size(sizeof(struct in_addr)) +
|
|
+ /* IFLA_IPTUN_FMR_EA_LEN */
|
|
+ nla_total_size(1) +
|
|
+ /* IFLA_IPTUN_FMR_IP6_PREFIX_LEN */
|
|
+ nla_total_size(1) +
|
|
+ /* IFLA_IPTUN_FMR_IP4_PREFIX_LEN */
|
|
+ nla_total_size(1) +
|
|
+ /* IFLA_IPTUN_FMR_OFFSET */
|
|
+ nla_total_size(1)
|
|
+ ) * fmrs +
|
|
0;
|
|
}
|
|
|
|
@@ -2094,6 +2329,9 @@ static int ip6_tnl_fill_info(struct sk_b
|
|
{
|
|
struct ip6_tnl *tunnel = netdev_priv(dev);
|
|
struct __ip6_tnl_parm *parm = &tunnel->parms;
|
|
+ struct __ip6_tnl_fmr *c;
|
|
+ int fmrcnt = 0;
|
|
+ struct nlattr *fmrs;
|
|
|
|
if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
|
|
nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
|
|
@@ -2103,9 +2341,27 @@ static int ip6_tnl_fill_info(struct sk_b
|
|
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_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
|
|
+ nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark) ||
|
|
+ !(fmrs = nla_nest_start(skb, IFLA_IPTUN_FMRS)))
|
|
goto nla_put_failure;
|
|
|
|
+ for (c = parm->fmrs; c; c = c->next) {
|
|
+ struct nlattr *fmr = nla_nest_start(skb, ++fmrcnt);
|
|
+ if (!fmr ||
|
|
+ nla_put(skb, IFLA_IPTUN_FMR_IP6_PREFIX,
|
|
+ sizeof(c->ip6_prefix), &c->ip6_prefix) ||
|
|
+ nla_put(skb, IFLA_IPTUN_FMR_IP4_PREFIX,
|
|
+ sizeof(c->ip4_prefix), &c->ip4_prefix) ||
|
|
+ nla_put_u8(skb, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, c->ip6_prefix_len) ||
|
|
+ nla_put_u8(skb, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, c->ip4_prefix_len) ||
|
|
+ nla_put_u8(skb, IFLA_IPTUN_FMR_EA_LEN, c->ea_len) ||
|
|
+ nla_put_u8(skb, IFLA_IPTUN_FMR_OFFSET, c->offset))
|
|
+ goto nla_put_failure;
|
|
+
|
|
+ nla_nest_end(skb, fmr);
|
|
+ }
|
|
+ nla_nest_end(skb, fmrs);
|
|
+
|
|
if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
|
|
@@ -2145,6 +2401,7 @@ static const struct nla_policy ip6_tnl_p
|
|
[IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
|
|
[IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
|
|
+ [IFLA_IPTUN_FMRS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static struct rtnl_link_ops ip6_link_ops __read_mostly = {
|
|
|