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Message-Id: <20210517152051.35233-1-cpp.code.lv@gmail.com>
Date: Mon, 17 May 2021 08:20:51 -0700
From: Toms Atteka <cpp.code.lv@...il.com>
To: netdev@...r.kernel.org
Cc: Toms Atteka <cpp.code.lv@...il.com>
Subject: [PATCH net-next v2] net: openvswitch: IPv6: Add IPv6 extension header support
IPv6 extension headers carry optional internet layer information
and are placed between the fixed header and the upper-layer
protocol header.
This change adds a new OpenFlow field OFPXMT_OFB_IPV6_EXTHDR and
packets can be filtered using ipv6_ext flag.
Tested-at: https://github.com/TomCodeLV/ovs/actions/runs/504185214
Signed-off-by: Toms Atteka <cpp.code.lv@...il.com>
---
include/uapi/linux/openvswitch.h | 1 +
net/openvswitch/flow.c | 141 +++++++++++++++++++++++++++++++
net/openvswitch/flow.h | 14 +++
net/openvswitch/flow_netlink.c | 5 +-
4 files changed, 160 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index 8d16744edc31..a19812b6631a 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -420,6 +420,7 @@ struct ovs_key_ipv6 {
__u8 ipv6_tclass;
__u8 ipv6_hlimit;
__u8 ipv6_frag; /* One of OVS_FRAG_TYPE_*. */
+ __u16 ipv6_exthdr;
};
struct ovs_key_tcp {
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index e586424d8b04..cfc5f395f82c 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -239,6 +239,145 @@ 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)
+{
+ int 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 pac ket.
+ */
+ 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;
@@ -254,6 +393,8 @@ 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;
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 758a8c77f736..e7a8eafae272 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -32,6 +32,19 @@ enum sw_flow_mac_proto {
#define SW_FLOW_KEY_INVALID 0x80
#define MPLS_LABEL_DEPTH 3
+/* Bit definitions for IPv6 Extension Header pseudo-field. */
+enum ofp12_ipv6exthdr_flags {
+ OFPIEH12_NONEXT = 1 << 0, /* "No next header" encountered. */
+ OFPIEH12_ESP = 1 << 1, /* Encrypted Sec Payload header present. */
+ OFPIEH12_AUTH = 1 << 2, /* Authentication header present. */
+ OFPIEH12_DEST = 1 << 3, /* 1 or 2 dest headers present. */
+ OFPIEH12_FRAG = 1 << 4, /* Fragment header present. */
+ OFPIEH12_ROUTER = 1 << 5, /* Router header present. */
+ OFPIEH12_HOP = 1 << 6, /* Hop-by-hop header present. */
+ OFPIEH12_UNREP = 1 << 7, /* Unexpected repeats encountered. */
+ OFPIEH12_UNSEQ = 1 << 8 /* Unexpected sequencing encountered. */
+};
+
/* Store options at the end of the array if they are less than the
* maximum size. This allows us to get the benefits of variable length
* matching for small options.
@@ -121,6 +134,7 @@ struct sw_flow_key {
struct in6_addr dst; /* IPv6 destination address. */
} addr;
__be32 label; /* IPv6 flow label. */
+ u16 exthdrs; /* IPv6 extension header flags */
union {
struct {
struct in6_addr src;
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index fd1f809e9bc1..681cd9ddda4a 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -367,7 +367,7 @@ size_t ovs_key_attr_size(void)
+ nla_total_size(4) /* OVS_KEY_ATTR_VLAN */
+ nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */
+ nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
- + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
+ + nla_total_size(42) /* OVS_KEY_ATTR_IPV6 */
+ nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
+ nla_total_size(28); /* OVS_KEY_ATTR_ND */
}
@@ -1585,6 +1585,8 @@ static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
ipv6_key->ipv6_hlimit, is_mask);
SW_FLOW_KEY_PUT(match, ip.frag,
ipv6_key->ipv6_frag, is_mask);
+ SW_FLOW_KEY_PUT(match, ipv6.exthdrs,
+ ipv6_key->ipv6_exthdr, is_mask);
SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
ipv6_key->ipv6_src,
sizeof(match->key->ipv6.addr.src),
@@ -2113,6 +2115,7 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
ipv6_key->ipv6_tclass = output->ip.tos;
ipv6_key->ipv6_hlimit = output->ip.ttl;
ipv6_key->ipv6_frag = output->ip.frag;
+ ipv6_key->ipv6_exthdr = output->ipv6.exthdrs;
} else if (swkey->eth.type == htons(ETH_P_NSH)) {
if (nsh_key_to_nlattr(&output->nsh, is_mask, skb))
goto nla_put_failure;
base-commit: 5d869070569a23aa909c6e7e9d010fc438a492ef
--
2.25.1
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