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Date: Tue, 1 Sep 2015 17:43:11 +0200
From: Ahmed Amamou <ahmed@...di.net>
To: netdev@...r.kernel.org
Cc: William Dauchy <william@...di.net>, Ahmed Amamou <ahmed@...di.net>,
Kamel Haddadou <kamel@...di.net>
Subject: [PATCH RFC v2 16/21] net: rbridge: add encapsulation process
add encapsulation process to detect frame type (multicast or unicast)
for known unicast frame add proper TRILL header
Signed-off-by: Ahmed Amamou <ahmed@...di.net>
Signed-off-by: Kamel Haddadou <kamel@...di.net>
---
net/bridge/rbr.c | 124 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 123 insertions(+), 1 deletion(-)
diff --git a/net/bridge/rbr.c b/net/bridge/rbr.c
index fdff167..8081b20 100644
--- a/net/bridge/rbr.c
+++ b/net/bridge/rbr.c
@@ -14,6 +14,8 @@
#include "br_private.h"
#include "rbr_private.h"
#include <linux/netfilter_bridge.h>
+#include <net/if_trill.h>
+
static void rbr_del_all(struct rbr *rbr);
static struct rbr *add_rbr(struct net_bridge *br)
@@ -123,6 +125,124 @@ static void rbr_del_all(struct rbr *rbr)
}
}
+static bool add_header(struct sk_buff *skb, uint16_t ingressnick,
+ u16 egressnick, bool multidest)
+{
+ struct trill_hdr *trh;
+ size_t trhsize;
+ u16 vlan_tci;
+ u16 trill_flags = 0;
+
+ trhsize = sizeof(*trh);
+ skb_push(skb, ETH_HLEN);
+ if (!skb->encapsulation) {
+ skb_reset_inner_headers(skb);
+ skb->encapsulation = 1;
+ }
+ /* fix inner VLAN */
+ if (br_vlan_get_tag(skb, &vlan_tci) == 0) {
+ skb = vlan_insert_tag(skb, skb->vlan_proto, vlan_tci);
+ if (!skb) {
+ pr_err("add_header: vlan_insert_tag failed\n");
+ return 1;
+ }
+ skb->vlan_proto = 0;
+ skb->vlan_tci = 0;
+ }
+ if (unlikely(skb_cow_head(skb, trhsize + ETH_HLEN))) {
+ pr_err("add_header: cow_head failed\n");
+ return 1;
+ }
+
+ trh = (struct trill_hdr *)skb_push(skb, sizeof(*trh));
+ trill_flags = trill_set_version(trill_flags, TRILL_PROTOCOL_VERS);
+ trill_flags = trill_set_hopcount(trill_flags, TRILL_DEFAULT_HOPS);
+ trill_flags = trill_set_multidest(trill_flags, multidest ? 1 : 0);
+
+ trh->th_flags = htons(trill_flags);
+ trh->th_egressnick = egressnick;
+ trh->th_ingressnick = ingressnick; /* self nick name */
+ /* make skb->mac_header point to outer mac header */
+ skb_push(skb, ETH_HLEN);
+ skb_reset_mac_header(skb); /* instead of the inner one */
+ eth_hdr(skb)->h_proto = htons(ETH_P_TRILL);
+ /* reset skb->data pointer */
+ skb_pull(skb, ETH_HLEN);
+ skb_reset_mac_len(skb);
+ return 0;
+}
+
+static void rbr_encaps(struct sk_buff *skb, u16 egressnick, u16 vid)
+{
+ u16 local_nick;
+ u16 dtnick;
+ struct rbr_node *self;
+ struct sk_buff *skb2;
+ struct rbr *rbr;
+ struct net_bridge_port *p;
+
+ p = br_port_get_rcu(skb->dev);
+ if (unlikely(!p)) {
+ pr_warn_ratelimited("rbr_encaps_prepare: port error\n");
+ goto encaps_drop;
+ }
+ rbr = p->br->rbr;
+
+ if (unlikely(egressnick != RBRIDGE_NICKNAME_NONE &&
+ !VALID_NICK(egressnick))) {
+ pr_warn_ratelimited
+ ("rbr_encaps_prepare: invalid destinaton nickname\n");
+ goto encaps_drop;
+ }
+ local_nick = rbr->nick;
+ if (unlikely(!VALID_NICK(local_nick))) {
+ pr_warn_ratelimited
+ ("rbr_encaps_prepare: invalid local nickname\n");
+ goto encaps_drop;
+ }
+ /* Daemon has not yet sent the local nickname */
+ self = rbr_find_node(rbr, local_nick);
+ if (unlikely(!self)) {
+ pr_warn_ratelimited
+ ("rbr_encaps_prepare: waiting for nickname\n");
+ goto encaps_drop;
+ }
+
+ /* Unknown destination => multidestination frame */
+ if (egressnick == RBRIDGE_NICKNAME_NONE) {
+ if (self->rbr_ni->dtrootcount > 0)
+ dtnick = RBR_NI_DTROOTNICK(self->rbr_ni, 0);
+ else
+ dtnick = rbr->treeroot;
+ rbr_node_put(self);
+ if (unlikely(!VALID_NICK(dtnick))) {
+ pr_warn_ratelimited
+ ("rbr_encaps_prepare: dtnick is unvalid\n");
+ goto encaps_drop;
+ }
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (unlikely(!skb2)) {
+ p->br->dev->stats.tx_dropped++;
+ pr_warn_ratelimited
+ ("rbr_encaps_prepare: skb_clone failed\n");
+ goto encaps_drop;
+ }
+ br_flood_deliver_flags(p->br, skb2, true, TRILL_FLAG_ACCESS);
+ if (unlikely(add_header(skb, local_nick, dtnick, 1)))
+ goto encaps_drop;
+ /* TODO Multi forward */
+ } else {
+ if (unlikely(add_header(skb, local_nick, egressnick, 0)))
+ goto encaps_drop;
+ /* TODO simple forwarding */
+ }
+ return;
+ encaps_drop:
+ if (likely(p && p->br))
+ p->br->dev->stats.tx_dropped++;
+ kfree_skb(skb);
+}
+
/* handling function hook allow handling
* a frame upon reception called via
* br_handle_frame_hook = rbr_handle_frame
@@ -136,6 +256,7 @@ rx_handler_result_t rbr_handle_frame(struct sk_buff **pskb)
struct net_bridge_port *p;
struct sk_buff *skb = *pskb;
u16 vid = 0;
+ u16 nick;
p = br_port_get_rcu(skb->dev);
br = p->br;
@@ -178,7 +299,8 @@ rx_handler_result_t rbr_handle_frame(struct sk_buff **pskb)
/* if packet is from access port and trill is enabled and dest
* is not an access port or is unknown, encaps it
*/
- /* TODO */
+ nick = get_nick_from_mac(p, eth_hdr(skb)->h_dest, vid);
+ rbr_encaps(skb, nick, vid);
return RX_HANDLER_CONSUMED;
}
if (p->trill_flag & TRILL_FLAG_TRUNK) {
--
2.1.4
--
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