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-rw-r--r--net/openvswitch/flow.c143
1 files changed, 142 insertions, 1 deletions
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 02096f2ec678..372bf54a0ca9 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -34,6 +34,7 @@
#include <net/mpls.h>
#include <net/ndisc.h>
#include <net/nsh.h>
+#include <net/pkt_cls.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include "conntrack.h"
@@ -240,6 +241,144 @@ static bool icmphdr_ok(struct sk_buff *skb)
sizeof(struct icmphdr));
}
+/**
+ * get_ipv6_ext_hdrs() - Parses packet and sets IPv6 extension header flags.
+ *
+ * @skb: buffer where extension header data starts in packet
+ * @nh: ipv6 header
+ * @ext_hdrs: flags are stored here
+ *
+ * OFPIEH12_UNREP is set if more than one of a given IPv6 extension header
+ * is unexpectedly encountered. (Two destination options headers may be
+ * expected and would not cause this bit to be set.)
+ *
+ * OFPIEH12_UNSEQ is set if IPv6 extension headers were not in the order
+ * preferred (but not required) by RFC 2460:
+ *
+ * When more than one extension header is used in the same packet, it is
+ * recommended that those headers appear in the following order:
+ * IPv6 header
+ * Hop-by-Hop Options header
+ * Destination Options header
+ * Routing header
+ * Fragment header
+ * Authentication header
+ * Encapsulating Security Payload header
+ * Destination Options header
+ * upper-layer header
+ */
+static void get_ipv6_ext_hdrs(struct sk_buff *skb, struct ipv6hdr *nh,
+ u16 *ext_hdrs)
+{
+ u8 next_type = nh->nexthdr;
+ unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
+ int dest_options_header_count = 0;
+
+ *ext_hdrs = 0;
+
+ while (ipv6_ext_hdr(next_type)) {
+ struct ipv6_opt_hdr _hdr, *hp;
+
+ switch (next_type) {
+ case IPPROTO_NONE:
+ *ext_hdrs |= OFPIEH12_NONEXT;
+ /* stop parsing */
+ return;
+
+ case IPPROTO_ESP:
+ if (*ext_hdrs & OFPIEH12_ESP)
+ *ext_hdrs |= OFPIEH12_UNREP;
+ if ((*ext_hdrs & ~(OFPIEH12_HOP | OFPIEH12_DEST |
+ OFPIEH12_ROUTER | IPPROTO_FRAGMENT |
+ OFPIEH12_AUTH | OFPIEH12_UNREP)) ||
+ dest_options_header_count >= 2) {
+ *ext_hdrs |= OFPIEH12_UNSEQ;
+ }
+ *ext_hdrs |= OFPIEH12_ESP;
+ break;
+
+ case IPPROTO_AH:
+ if (*ext_hdrs & OFPIEH12_AUTH)
+ *ext_hdrs |= OFPIEH12_UNREP;
+ if ((*ext_hdrs &
+ ~(OFPIEH12_HOP | OFPIEH12_DEST | OFPIEH12_ROUTER |
+ IPPROTO_FRAGMENT | OFPIEH12_UNREP)) ||
+ dest_options_header_count >= 2) {
+ *ext_hdrs |= OFPIEH12_UNSEQ;
+ }
+ *ext_hdrs |= OFPIEH12_AUTH;
+ break;
+
+ case IPPROTO_DSTOPTS:
+ if (dest_options_header_count == 0) {
+ if (*ext_hdrs &
+ ~(OFPIEH12_HOP | OFPIEH12_UNREP))
+ *ext_hdrs |= OFPIEH12_UNSEQ;
+ *ext_hdrs |= OFPIEH12_DEST;
+ } else if (dest_options_header_count == 1) {
+ if (*ext_hdrs &
+ ~(OFPIEH12_HOP | OFPIEH12_DEST |
+ OFPIEH12_ROUTER | OFPIEH12_FRAG |
+ OFPIEH12_AUTH | OFPIEH12_ESP |
+ OFPIEH12_UNREP)) {
+ *ext_hdrs |= OFPIEH12_UNSEQ;
+ }
+ } else {
+ *ext_hdrs |= OFPIEH12_UNREP;
+ }
+ dest_options_header_count++;
+ break;
+
+ case IPPROTO_FRAGMENT:
+ if (*ext_hdrs & OFPIEH12_FRAG)
+ *ext_hdrs |= OFPIEH12_UNREP;
+ if ((*ext_hdrs & ~(OFPIEH12_HOP |
+ OFPIEH12_DEST |
+ OFPIEH12_ROUTER |
+ OFPIEH12_UNREP)) ||
+ dest_options_header_count >= 2) {
+ *ext_hdrs |= OFPIEH12_UNSEQ;
+ }
+ *ext_hdrs |= OFPIEH12_FRAG;
+ break;
+
+ case IPPROTO_ROUTING:
+ if (*ext_hdrs & OFPIEH12_ROUTER)
+ *ext_hdrs |= OFPIEH12_UNREP;
+ if ((*ext_hdrs & ~(OFPIEH12_HOP |
+ OFPIEH12_DEST |
+ OFPIEH12_UNREP)) ||
+ dest_options_header_count >= 2) {
+ *ext_hdrs |= OFPIEH12_UNSEQ;
+ }
+ *ext_hdrs |= OFPIEH12_ROUTER;
+ break;
+
+ case IPPROTO_HOPOPTS:
+ if (*ext_hdrs & OFPIEH12_HOP)
+ *ext_hdrs |= OFPIEH12_UNREP;
+ /* OFPIEH12_HOP is set to 1 if a hop-by-hop IPv6
+ * extension header is present as the first
+ * extension header in the packet.
+ */
+ if (*ext_hdrs == 0)
+ *ext_hdrs |= OFPIEH12_HOP;
+ else
+ *ext_hdrs |= OFPIEH12_UNSEQ;
+ break;
+
+ default:
+ return;
+ }
+
+ hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
+ if (!hp)
+ break;
+ next_type = hp->nexthdr;
+ start += ipv6_optlen(hp);
+ }
+}
+
static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
{
unsigned short frag_off;
@@ -255,6 +394,8 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
nh = ipv6_hdr(skb);
+ get_ipv6_ext_hdrs(skb, nh, &key->ipv6.exthdrs);
+
key->ip.proto = NEXTHDR_NONE;
key->ip.tos = ipv6_get_dsfield(nh);
key->ip.ttl = nh->hop_limit;
@@ -895,7 +1036,7 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
key->mac_proto = res;
#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
- if (static_branch_unlikely(&tc_recirc_sharing_support)) {
+ if (tc_skb_ext_tc_enabled()) {
tc_ext = skb_ext_find(skb, TC_SKB_EXT);
key->recirc_id = tc_ext ? tc_ext->chain : 0;
OVS_CB(skb)->mru = tc_ext ? tc_ext->mru : 0;