From 6d6148bc78d2f002ecc67b801c5f55a0cc5184c8 Mon Sep 17 00:00:00 2001 From: Murali Karicheri Date: Fri, 17 Jul 2020 10:55:09 -0400 Subject: net: hsr: fix incorrect lsdu size in the tag of HSR frames for small frames For small Ethernet frames with size less than minimum size 66 for HSR vs 60 for regular Ethernet frames, hsr driver currently doesn't pad the frame to make it minimum size. This results in incorrect LSDU size being populated in the HSR tag for these frames. Fix this by padding the frame to the minimum size applicable for HSR. Signed-off-by: Murali Karicheri Signed-off-by: David S. Miller --- net/hsr/hsr_forward.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/hsr') diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c index ed13760463de..e42fd356f073 100644 --- a/net/hsr/hsr_forward.c +++ b/net/hsr/hsr_forward.c @@ -127,6 +127,9 @@ static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame, int lane_id; int lsdu_size; + /* pad to minimum packet size which is 60 + 6 (HSR tag) */ + skb_put_padto(skb, ETH_ZLEN + HSR_HLEN); + if (port->type == HSR_PT_SLAVE_A) lane_id = 0; else -- cgit v1.2.3 From eea9f73e1ff9b99fbb937d41bb07c5bb2ae9ea2f Mon Sep 17 00:00:00 2001 From: Murali Karicheri Date: Fri, 17 Jul 2020 10:55:10 -0400 Subject: net: hsr: validate address B before copying to skb Validate MAC address before copying the same to outgoing frame skb destination address. Since a node can have zero mac address for Link B until a valid frame is received over that link, this fix address the issue of a zero MAC address being in the packet. Signed-off-by: Murali Karicheri Signed-off-by: David S. Miller --- net/hsr/hsr_framereg.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/hsr') diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c index 03b891904314..530de24b1fb5 100644 --- a/net/hsr/hsr_framereg.c +++ b/net/hsr/hsr_framereg.c @@ -325,7 +325,8 @@ void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb, if (port->type != node_dst->addr_B_port) return; - ether_addr_copy(eth_hdr(skb)->h_dest, node_dst->macaddress_B); + if (is_valid_ether_addr(node_dst->macaddress_B)) + ether_addr_copy(eth_hdr(skb)->h_dest, node_dst->macaddress_B); } void hsr_register_frame_in(struct hsr_node *node, struct hsr_port *port, -- cgit v1.2.3 From 5d93518e06b2102253d465e523f16bd4cb5ce859 Mon Sep 17 00:00:00 2001 From: Murali Karicheri Date: Mon, 20 Jul 2020 12:43:27 -0400 Subject: net: hsr: check for return value of skb_put_padto() skb_put_padto() can fail. So check for return type and return NULL for skb. Caller checks for skb and acts correctly if it is NULL. Fixes: 6d6148bc78d2 ("net: hsr: fix incorrect lsdu size in the tag of HSR frames for small frames") Signed-off-by: Murali Karicheri Signed-off-by: David S. Miller --- net/hsr/hsr_forward.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) (limited to 'net/hsr') diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c index e42fd356f073..1ea17752fffc 100644 --- a/net/hsr/hsr_forward.c +++ b/net/hsr/hsr_forward.c @@ -120,15 +120,17 @@ static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame, return skb_clone(frame->skb_std, GFP_ATOMIC); } -static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame, - struct hsr_port *port, u8 proto_version) +static struct sk_buff *hsr_fill_tag(struct sk_buff *skb, + struct hsr_frame_info *frame, + struct hsr_port *port, u8 proto_version) { struct hsr_ethhdr *hsr_ethhdr; int lane_id; int lsdu_size; /* pad to minimum packet size which is 60 + 6 (HSR tag) */ - skb_put_padto(skb, ETH_ZLEN + HSR_HLEN); + if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN)) + return NULL; if (port->type == HSR_PT_SLAVE_A) lane_id = 0; @@ -147,6 +149,8 @@ static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame, hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto; hsr_ethhdr->ethhdr.h_proto = htons(proto_version ? ETH_P_HSR : ETH_P_PRP); + + return skb; } static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o, @@ -175,9 +179,10 @@ static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o, memmove(dst, src, movelen); skb_reset_mac_header(skb); - hsr_fill_tag(skb, frame, port, port->hsr->prot_version); - - return skb; + /* skb_put_padto free skb on error and hsr_fill_tag returns NULL in + * that case + */ + return hsr_fill_tag(skb, frame, port, port->hsr->prot_version); } /* If the original frame was an HSR tagged frame, just clone it to be sent -- cgit v1.2.3