From 96d592ed599434d2d5f339a1d282871bc6377d2c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Linus=20L=C3=BCssing?= Date: Sun, 6 Jun 2010 21:28:17 +0200 Subject: [PATCH] Staging: batman-adv: Adding netfilter-bridge hooks MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit batman-adv is receiving and sending the packets of its own ether type on a very early/low level. Therefore we need to add explicit hooks to give netfilter/ebtables a chance to filter them. Reported-by: Antonio Quartulli Signed-off-by: Linus Lüssing Signed-off-by: Sven Eckelmann Signed-off-by: Greg Kroah-Hartman --- drivers/staging/batman-adv/hard-interface.c | 14 +++++++++++++- drivers/staging/batman-adv/send.c | 9 +++++++-- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/drivers/staging/batman-adv/hard-interface.c b/drivers/staging/batman-adv/hard-interface.c index 7a582e80de18..6939b8d4ec80 100644 --- a/drivers/staging/batman-adv/hard-interface.c +++ b/drivers/staging/batman-adv/hard-interface.c @@ -30,6 +30,7 @@ #include "hash.h" #include +#include #define MIN(x, y) ((x) < (y) ? (x) : (y)) @@ -432,6 +433,11 @@ out: return NOTIFY_DONE; } +static int batman_skb_recv_finish(struct sk_buff *skb) +{ + return NF_ACCEPT; +} + /* receive a packet with the batman ethertype coming on a hard * interface */ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev, @@ -451,6 +457,13 @@ int batman_skb_recv(struct sk_buff *skb, struct net_device *dev, if (atomic_read(&module_state) != MODULE_ACTIVE) goto err_free; + /* if netfilter/ebtables wants to block incoming batman + * packets then give them a chance to do so here */ + ret = NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, dev, NULL, + batman_skb_recv_finish); + if (ret != 1) + goto err_out; + /* packet should hold at least type and version */ if (unlikely(skb_headlen(skb) < 2)) goto err_free; @@ -530,7 +543,6 @@ err_out: return NET_RX_DROP; } - struct notifier_block hard_if_notifier = { .notifier_call = hard_if_event, }; diff --git a/drivers/staging/batman-adv/send.c b/drivers/staging/batman-adv/send.c index ac69ed871a76..7365f6dbcb6b 100644 --- a/drivers/staging/batman-adv/send.c +++ b/drivers/staging/batman-adv/send.c @@ -29,6 +29,8 @@ #include "vis.h" #include "aggregation.h" +#include + /* apply hop penalty for a normal link */ static uint8_t hop_penalty(const uint8_t tq) { @@ -90,9 +92,12 @@ int send_skb_packet(struct sk_buff *skb, /* dev_queue_xmit() returns a negative result on error. However on * congestion and traffic shaping, it drops and returns NET_XMIT_DROP - * (which is > 0). This will not be treated as an error. */ + * (which is > 0). This will not be treated as an error. + * Also, if netfilter/ebtables wants to block outgoing batman + * packets then giving them a chance to do so here */ - return dev_queue_xmit(skb); + return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, + dev_queue_xmit); send_skb_err: kfree_skb(skb); return NET_XMIT_DROP; -- 2.20.1