[PATCH net-next v2 0/2] net: bridge: mcast: simplify allow/block EHT code

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5 messages, 3 authors, 2021-03-16 · open the first message on its own page

[PATCH net-next v2 0/2] net: bridge: mcast: simplify allow/block EHT code

From: Nikolay Aleksandrov <razor@blackwall.org>
Date: 2021-03-15 17:16:18

From: Nikolay Aleksandrov <redacted>

Hi,
The set does two minor cleanups of the EHT allow/block handling code:
patch 01 removes code which is unreachable (it was used in initial EHT
versions, but isn't anymore) and prepares the allow/block functions to be
factored out. Patch 02 factors out common allow/block handling code.
There are no functional changes.

v2: send patch 02 and the proper version of both patches

Thanks,
 Nik

Nikolay Aleksandrov (2):
  net: bridge: mcast: remove unreachable EHT code
  net: bridge: mcast: factor out common allow/block EHT handling

 net/bridge/br_multicast_eht.c | 141 +++++++++-------------------------
 1 file changed, 35 insertions(+), 106 deletions(-)

-- 
2.29.2

[PATCH net-next v2 1/2] net: bridge: mcast: remove unreachable EHT code

From: Nikolay Aleksandrov <razor@blackwall.org>
Date: 2021-03-15 17:16:18

From: Nikolay Aleksandrov <redacted>

In the initial EHT versions there were common functions which handled
allow/block messages for both INCLUDE and EXCLUDE modes, but later they
were separated. It seems I've left some common code which cannot be
reached because the filter mode is checked before calling the respective
functions, i.e. the host filter is always in EXCLUDE mode when using
__eht_allow_excl() and __eht_block_excl() thus we can drop the host_excl
checks inside and simplify the code a bit.

Signed-off-by: Nikolay Aleksandrov <redacted>
---
 net/bridge/br_multicast_eht.c | 57 +++++++++--------------------------
 1 file changed, 15 insertions(+), 42 deletions(-)

diff --git a/net/bridge/br_multicast_eht.c b/net/bridge/br_multicast_eht.c
index fea38b9a7268..982398e44658 100644
--- a/net/bridge/br_multicast_eht.c
+++ b/net/bridge/br_multicast_eht.c

@@ -522,31 +522,24 @@ static bool __eht_allow_excl(struct net_bridge_port_group *pg,
 			     u32 nsrcs,
 			     size_t addr_size)
 {
-	bool changed = false, host_excl = false;
 	union net_bridge_eht_addr eht_src_addr;
 	struct net_bridge_group_src *src_ent;
+	bool changed = false;
 	struct br_ip src_ip;
 	u32 src_idx;
 
-	host_excl = !!(br_multicast_eht_host_filter_mode(pg, h_addr) == MCAST_EXCLUDE);
 	memset(&eht_src_addr, 0, sizeof(eht_src_addr));
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
 		memcpy(&eht_src_addr, srcs + (src_idx * addr_size), addr_size);
-		if (!host_excl) {
-			br_multicast_create_eht_set_entry(pg, &eht_src_addr, h_addr,
-							  MCAST_INCLUDE,
-							  false);
-		} else {
-			if (!br_multicast_del_eht_set_entry(pg, &eht_src_addr,
-							    h_addr))
-				continue;
-			memcpy(&src_ip, srcs + (src_idx * addr_size), addr_size);
-			src_ent = br_multicast_find_group_src(pg, &src_ip);
-			if (!src_ent)
-				continue;
-			br_multicast_del_group_src(src_ent, true);
-			changed = true;
-		}
+		if (!br_multicast_del_eht_set_entry(pg, &eht_src_addr,
+						    h_addr))
+			continue;
+		memcpy(&src_ip, srcs + (src_idx * addr_size), addr_size);
+		src_ent = br_multicast_find_group_src(pg, &src_ip);
+		if (!src_ent)
+			continue;
+		br_multicast_del_group_src(src_ent, true);
+		changed = true;
 	}
 
 	return changed;

@@ -602,42 +595,22 @@ static bool __eht_block_incl(struct net_bridge_port_group *pg,
 	return changed;
 }
 
-static bool __eht_block_excl(struct net_bridge_port_group *pg,
+static void __eht_block_excl(struct net_bridge_port_group *pg,
 			     union net_bridge_eht_addr *h_addr,
 			     void *srcs,
 			     u32 nsrcs,
 			     size_t addr_size)
 {
-	bool changed = false, host_excl = false;
 	union net_bridge_eht_addr eht_src_addr;
-	struct net_bridge_group_src *src_ent;
-	struct br_ip src_ip;
 	u32 src_idx;
 
-	host_excl = !!(br_multicast_eht_host_filter_mode(pg, h_addr) == MCAST_EXCLUDE);
 	memset(&eht_src_addr, 0, sizeof(eht_src_addr));
-	memset(&src_ip, 0, sizeof(src_ip));
-	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
 		memcpy(&eht_src_addr, srcs + (src_idx * addr_size), addr_size);
-		if (host_excl) {
-			br_multicast_create_eht_set_entry(pg, &eht_src_addr, h_addr,
-							  MCAST_EXCLUDE,
-							  false);
-		} else {
-			if (!br_multicast_del_eht_set_entry(pg, &eht_src_addr,
-							    h_addr))
-				continue;
-			memcpy(&src_ip, srcs + (src_idx * addr_size), addr_size);
-			src_ent = br_multicast_find_group_src(pg, &src_ip);
-			if (!src_ent)
-				continue;
-			br_multicast_del_group_src(src_ent, true);
-			changed = true;
-		}
+		br_multicast_create_eht_set_entry(pg, &eht_src_addr, h_addr,
+						  MCAST_EXCLUDE,
+						  false);
 	}
-
-	return changed;
 }
 
 static bool br_multicast_eht_block(struct net_bridge_port_group *pg,

@@ -653,7 +626,7 @@ static bool br_multicast_eht_block(struct net_bridge_port_group *pg,
 		changed = __eht_block_incl(pg, h_addr, srcs, nsrcs, addr_size);
 		break;
 	case MCAST_EXCLUDE:
-		changed = __eht_block_excl(pg, h_addr, srcs, nsrcs, addr_size);
+		__eht_block_excl(pg, h_addr, srcs, nsrcs, addr_size);
 		break;
 	}

-- 
2.29.2

[PATCH net-next v2 2/2] net: bridge: mcast: factor out common allow/block EHT handling

From: Nikolay Aleksandrov <razor@blackwall.org>
Date: 2021-03-15 17:16:18

From: Nikolay Aleksandrov <redacted>

We hande EHT state change for ALLOW messages in INCLUDE mode and for
BLOCK messages in EXCLUDE mode similarly - create the new set entries
with the proper filter mode. We also handle EHT state change for ALLOW
messages in EXCLUDE mode and for BLOCK messages in INCLUDE mode in a
similar way - delete the common entries (current set and new set).
Factor out all the common code as follows:
 - ALLOW/INCLUDE, BLOCK/EXCLUDE: call __eht_create_set_entries()
 - ALLOW/EXCLUDE, BLOCK/INCLUDE: call __eht_del_common_set_entries()

The set entries creation can be reused in __eht_inc_exc() as well.

Signed-off-by: Nikolay Aleksandrov <redacted>
---
 net/bridge/br_multicast_eht.c | 98 ++++++++++-------------------------
 1 file changed, 27 insertions(+), 71 deletions(-)

diff --git a/net/bridge/br_multicast_eht.c b/net/bridge/br_multicast_eht.c
index 982398e44658..13290a749d09 100644
--- a/net/bridge/br_multicast_eht.c
+++ b/net/bridge/br_multicast_eht.c

@@ -498,11 +498,13 @@ static void br_multicast_del_eht_host(struct net_bridge_port_group *pg,
 					       &set_h->h_addr);
 }
 
-static void __eht_allow_incl(struct net_bridge_port_group *pg,
-			     union net_bridge_eht_addr *h_addr,
-			     void *srcs,
-			     u32 nsrcs,
-			     size_t addr_size)
+/* create new set entries from reports */
+static void __eht_create_set_entries(struct net_bridge_port_group *pg,
+				     union net_bridge_eht_addr *h_addr,
+				     void *srcs,
+				     u32 nsrcs,
+				     size_t addr_size,
+				     int filter_mode)
 {
 	union net_bridge_eht_addr eht_src_addr;
 	u32 src_idx;

@@ -511,16 +513,17 @@ static void __eht_allow_incl(struct net_bridge_port_group *pg,
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
 		memcpy(&eht_src_addr, srcs + (src_idx * addr_size), addr_size);
 		br_multicast_create_eht_set_entry(pg, &eht_src_addr, h_addr,
-						  MCAST_INCLUDE,
+						  filter_mode,
 						  false);
 	}
 }
 
-static bool __eht_allow_excl(struct net_bridge_port_group *pg,
-			     union net_bridge_eht_addr *h_addr,
-			     void *srcs,
-			     u32 nsrcs,
-			     size_t addr_size)
+/* delete existing set entries and their (S,G) entries if they were the last */
+static bool __eht_del_set_entries(struct net_bridge_port_group *pg,
+				  union net_bridge_eht_addr *h_addr,
+				  void *srcs,
+				  u32 nsrcs,
+				  size_t addr_size)
 {
 	union net_bridge_eht_addr eht_src_addr;
 	struct net_bridge_group_src *src_ent;

@@ -529,10 +532,11 @@ static bool __eht_allow_excl(struct net_bridge_port_group *pg,
 	u32 src_idx;
 
 	memset(&eht_src_addr, 0, sizeof(eht_src_addr));
+	memset(&src_ip, 0, sizeof(src_ip));
+	src_ip.proto = pg->key.addr.proto;
 	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
 		memcpy(&eht_src_addr, srcs + (src_idx * addr_size), addr_size);
-		if (!br_multicast_del_eht_set_entry(pg, &eht_src_addr,
-						    h_addr))
+		if (!br_multicast_del_eht_set_entry(pg, &eht_src_addr, h_addr))
 			continue;
 		memcpy(&src_ip, srcs + (src_idx * addr_size), addr_size);
 		src_ent = br_multicast_find_group_src(pg, &src_ip);

@@ -555,64 +559,18 @@ static bool br_multicast_eht_allow(struct net_bridge_port_group *pg,
 
 	switch (br_multicast_eht_host_filter_mode(pg, h_addr)) {
 	case MCAST_INCLUDE:
-		__eht_allow_incl(pg, h_addr, srcs, nsrcs, addr_size);
+		__eht_create_set_entries(pg, h_addr, srcs, nsrcs, addr_size,
+					 MCAST_INCLUDE);
 		break;
 	case MCAST_EXCLUDE:
-		changed = __eht_allow_excl(pg, h_addr, srcs, nsrcs, addr_size);
+		changed = __eht_del_set_entries(pg, h_addr, srcs, nsrcs,
+						addr_size);
 		break;
 	}
 
 	return changed;
 }
 
-static bool __eht_block_incl(struct net_bridge_port_group *pg,
-			     union net_bridge_eht_addr *h_addr,
-			     void *srcs,
-			     u32 nsrcs,
-			     size_t addr_size)
-{
-	union net_bridge_eht_addr eht_src_addr;
-	struct net_bridge_group_src *src_ent;
-	bool changed = false;
-	struct br_ip src_ip;
-	u32 src_idx;
-
-	memset(&eht_src_addr, 0, sizeof(eht_src_addr));
-	memset(&src_ip, 0, sizeof(src_ip));
-	src_ip.proto = pg->key.addr.proto;
-	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&eht_src_addr, srcs + (src_idx * addr_size), addr_size);
-		if (!br_multicast_del_eht_set_entry(pg, &eht_src_addr, h_addr))
-			continue;
-		memcpy(&src_ip, srcs + (src_idx * addr_size), addr_size);
-		src_ent = br_multicast_find_group_src(pg, &src_ip);
-		if (!src_ent)
-			continue;
-		br_multicast_del_group_src(src_ent, true);
-		changed = true;
-	}
-
-	return changed;
-}
-
-static void __eht_block_excl(struct net_bridge_port_group *pg,
-			     union net_bridge_eht_addr *h_addr,
-			     void *srcs,
-			     u32 nsrcs,
-			     size_t addr_size)
-{
-	union net_bridge_eht_addr eht_src_addr;
-	u32 src_idx;
-
-	memset(&eht_src_addr, 0, sizeof(eht_src_addr));
-	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&eht_src_addr, srcs + (src_idx * addr_size), addr_size);
-		br_multicast_create_eht_set_entry(pg, &eht_src_addr, h_addr,
-						  MCAST_EXCLUDE,
-						  false);
-	}
-}
-
 static bool br_multicast_eht_block(struct net_bridge_port_group *pg,
 				   union net_bridge_eht_addr *h_addr,
 				   void *srcs,

@@ -623,10 +581,12 @@ static bool br_multicast_eht_block(struct net_bridge_port_group *pg,
 
 	switch (br_multicast_eht_host_filter_mode(pg, h_addr)) {
 	case MCAST_INCLUDE:
-		changed = __eht_block_incl(pg, h_addr, srcs, nsrcs, addr_size);
+		changed = __eht_del_set_entries(pg, h_addr, srcs, nsrcs,
+						addr_size);
 		break;
 	case MCAST_EXCLUDE:
-		__eht_block_excl(pg, h_addr, srcs, nsrcs, addr_size);
+		__eht_create_set_entries(pg, h_addr, srcs, nsrcs, addr_size,
+					 MCAST_EXCLUDE);
 		break;
 	}

@@ -644,7 +604,6 @@ static bool __eht_inc_exc(struct net_bridge_port_group *pg,
 {
 	bool changed = false, flush_entries = to_report;
 	union net_bridge_eht_addr eht_src_addr;
-	u32 src_idx;
 
 	if (br_multicast_eht_host_filter_mode(pg, h_addr) != filter_mode)
 		flush_entries = true;

@@ -653,11 +612,8 @@ static bool __eht_inc_exc(struct net_bridge_port_group *pg,
 	/* if we're changing mode del host and its entries */
 	if (flush_entries)
 		br_multicast_del_eht_host(pg, h_addr);
-	for (src_idx = 0; src_idx < nsrcs; src_idx++) {
-		memcpy(&eht_src_addr, srcs + (src_idx * addr_size), addr_size);
-		br_multicast_create_eht_set_entry(pg, &eht_src_addr, h_addr,
-						  filter_mode, false);
-	}
+	__eht_create_set_entries(pg, h_addr, srcs, nsrcs, addr_size,
+				 filter_mode);
 	/* we can be missing sets only if we've deleted some entries */
 	if (flush_entries) {
 		struct net_bridge *br = pg->key.port->br;

-- 
2.29.2

Re: [PATCH net-next v2 0/2] net: bridge: mcast: simplify allow/block EHT code

From: Jakub Kicinski <kuba@kernel.org>
Date: 2021-03-16 20:59:42

On Mon, 15 Mar 2021 19:13:40 +0200 Nikolay Aleksandrov wrote:

There are no functional changes.

That appears to indeed be the case:

Reviewed-by: Jakub Kicinski <kuba@kernel.org>

Re: [PATCH net-next v2 0/2] net: bridge: mcast: simplify allow/block EHT code

From: patchwork-bot+netdevbpf@kernel.org
Date: 2021-03-16 22:00:52

Hello:

This series was applied to netdev/net-next.git (refs/heads/master):

On Mon, 15 Mar 2021 19:13:40 +0200 you wrote:

From: Nikolay Aleksandrov <redacted>

Hi,
The set does two minor cleanups of the EHT allow/block handling code:
patch 01 removes code which is unreachable (it was used in initial EHT
versions, but isn't anymore) and prepares the allow/block functions to be
factored out. Patch 02 factors out common allow/block handling code.
There are no functional changes.

[...]

Here is the summary with links:
  - [net-next,v2,1/2] net: bridge: mcast: remove unreachable EHT code
    https://git.kernel.org/netdev/net-next/c/6aa2c371c729
  - [net-next,v2,2/2] net: bridge: mcast: factor out common allow/block EHT handling
    https://git.kernel.org/netdev/net-next/c/e09cf582059e

You are awesome, thank you!
--
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