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Message-Id: <1620433768-31048-1-git-send-email-michael.chan@broadcom.com>
Date: Fri, 7 May 2021 20:29:28 -0400
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com,
alexander.duyck@...il.com
Subject: [PATCH net v2] bnxt_en: Fix and improve .ndo_features_check().
Jakub Kicinski pointed out that we need to handle ipv6 extension headers
and to explicitly check for supported tunnel types in
.ndo_features_check().
For ipv6 extension headers, the hardware supports up to 2 ext. headers
and each must be <= 64 bytes. For tunneled packets, the supported
packets are UDP with supported VXLAN and Geneve ports, GRE, and IPIP.
v2: Add missing step to check inner ipv6 header for UDP and GRE tunnels.
Check TCP/UDP next header after skipping ipv6 ext headers for
non-tunneled packets and for inner ipv6.
(Both feedback from Alexander Duyck)
Reviewed-by: Edwin Peer <edwin.peer@...adcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Fixes: 1698d600b361 ("bnxt_en: Implement .ndo_features_check().")
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 125 +++++++++++++++++++---
1 file changed, 108 insertions(+), 17 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 39ac9e2f5118..8e4670e37140 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -10785,37 +10785,128 @@ static int bnxt_set_features(struct net_device *dev, netdev_features_t features)
return rc;
}
+static bool bnxt_exthdr_check(struct bnxt *bp, struct sk_buff *skb, int nw_off,
+ u8 *nextproto)
+{
+ struct ipv6hdr *ip6h = (struct ipv6hdr *)(skb->data + nw_off);
+ int hdr_count = 0;
+ u8 nexthdr;
+ int start;
+
+ /* Check that there are at most 2 IPv6 extension headers, no
+ * fragment header, and each is <= 64 bytes.
+ */
+ start = nw_off + sizeof(*ip6h);
+ nexthdr = ip6h->nexthdr;
+ while (ipv6_ext_hdr(nexthdr)) {
+ struct ipv6_opt_hdr _hdr, *hp;
+ int hdrlen;
+
+ if (hdr_count >= 3 || nexthdr == NEXTHDR_NONE ||
+ nexthdr == NEXTHDR_FRAGMENT)
+ return false;
+ hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
+ if (!hp)
+ return false;
+ if (nexthdr == NEXTHDR_AUTH)
+ hdrlen = ipv6_authlen(hp);
+ else
+ hdrlen = ipv6_optlen(hp);
+
+ if (hdrlen > 64)
+ return false;
+ nexthdr = hp->nexthdr;
+ start += hdrlen;
+ hdr_count++;
+ }
+ /* Only support TCP/UDP unless the caller checks the nextproto. */
+ if (nextproto) {
+ *nextproto = nexthdr;
+ return true;
+ }
+ if (nexthdr == IPPROTO_TCP || nexthdr == IPPROTO_UDP)
+ return true;
+ return false;
+}
+
+/* For UDP, we can only handle 1 Vxlan port and 1 Geneve port. */
+static bool bnxt_udp_tunl_check(struct bnxt *bp, struct sk_buff *skb)
+{
+ struct udphdr *uh = udp_hdr(skb);
+ __be16 udp_port = uh->dest;
+
+ if (udp_port != bp->vxlan_port && udp_port != bp->nge_port)
+ return false;
+ if (skb->inner_protocol_type == ENCAP_TYPE_ETHER) {
+ struct ethhdr *eh = inner_eth_hdr(skb);
+
+ switch (eh->h_proto) {
+ case htons(ETH_P_IP):
+ return true;
+ case htons(ETH_P_IPV6):
+ return bnxt_exthdr_check(bp, skb,
+ skb_inner_network_offset(skb),
+ NULL);
+ }
+ }
+ return false;
+}
+
+static bool bnxt_tunl_check(struct bnxt *bp, struct sk_buff *skb, u8 l4_proto)
+{
+ switch (l4_proto) {
+ case IPPROTO_UDP:
+ return bnxt_udp_tunl_check(bp, skb);
+ case IPPROTO_IPIP:
+ return true;
+ case IPPROTO_GRE: {
+ switch (skb->inner_protocol) {
+ default:
+ return false;
+ case htons(ETH_P_IP):
+ return true;
+ case htons(ETH_P_IPV6):
+ fallthrough;
+ }
+ }
+ case IPPROTO_IPV6:
+ /* Check ext headers of inner ipv6 */
+ return bnxt_exthdr_check(bp, skb, skb_inner_network_offset(skb),
+ NULL);
+ }
+ return false;
+}
+
static netdev_features_t bnxt_features_check(struct sk_buff *skb,
struct net_device *dev,
netdev_features_t features)
{
- struct bnxt *bp;
- __be16 udp_port;
+ struct bnxt *bp = netdev_priv(dev);
u8 l4_proto = 0;
features = vlan_features_check(skb, features);
- if (!skb->encapsulation)
- return features;
-
switch (vlan_get_protocol(skb)) {
case htons(ETH_P_IP):
+ if (!skb->encapsulation)
+ return features;
l4_proto = ip_hdr(skb)->protocol;
- break;
+ if (!bnxt_tunl_check(bp, skb, l4_proto))
+ goto disable_offload;
+ return features;
case htons(ETH_P_IPV6):
- l4_proto = ipv6_hdr(skb)->nexthdr;
+ if (!bnxt_exthdr_check(bp, skb, skb_network_offset(skb),
+ &l4_proto))
+ goto disable_offload;
+ if (skb->encapsulation) {
+ if (bnxt_tunl_check(bp, skb, l4_proto))
+ return features;
+ } else if (l4_proto == IPPROTO_TCP || l4_proto == IPPROTO_UDP) {
+ return features;
+ }
break;
- default:
- return features;
}
- if (l4_proto != IPPROTO_UDP)
- return features;
-
- bp = netdev_priv(dev);
- /* For UDP, we can only handle 1 Vxlan port and 1 Geneve port. */
- udp_port = udp_hdr(skb)->dest;
- if (udp_port == bp->vxlan_port || udp_port == bp->nge_port)
- return features;
+disable_offload:
return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
}
--
2.18.1
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