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net: openvswitch: IPv6: Add IPv6 extension header support

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This change adds a new OpenFlow field OFPXMT_OFB_IPV6_EXTHDR and
packets can be filtered using ipv6_ext flag.

Signed-off-by: Toms Atteka <cpp.code.lv@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Toms Atteka 2022-02-23 16:54:09 -08:00 committed by David S. Miller
parent a46e3d5eb7
commit 28a3f06017
4 changed files with 184 additions and 2 deletions
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6
include/uapi/linux/openvswitch.h
View File

@ -351,6 +351,7 @@ enum ovs_key_attr {
OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, /* struct ovs_key_ct_tuple_ipv4 */
OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, /* struct ovs_key_ct_tuple_ipv6 */
OVS_KEY_ATTR_NSH, /* Nested set of ovs_nsh_key_* */
OVS_KEY_ATTR_IPV6_EXTHDRS, /* struct ovs_key_ipv6_exthdr */
#ifdef __KERNEL__
OVS_KEY_ATTR_TUNNEL_INFO, /* struct ip_tunnel_info */
@ -430,6 +431,11 @@ struct ovs_key_ipv6 {
__u8 ipv6_frag; /* One of OVS_FRAG_TYPE_*. */
};
/* separate structure to support backward compatibility with older user space */
struct ovs_key_ipv6_exthdrs {
__u16 hdrs;
};
struct ovs_key_tcp {
__be16 tcp_src;
__be16 tcp_dst;

140
net/openvswitch/flow.c
View File

@ -241,6 +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;
@ -256,6 +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;

14
net/openvswitch/flow.h
View File

@ -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;

26
net/openvswitch/flow_netlink.c
View File

@ -346,7 +346,7 @@ size_t ovs_key_attr_size(void)
/* Whenever adding new OVS_KEY_ FIELDS, we should consider
* updating this function.
*/
BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 29);
BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 30);
return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */
+ nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */
@ -369,7 +369,8 @@ size_t ovs_key_attr_size(void)
+ nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */
+ nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */
+ nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */
+ nla_total_size(28); /* OVS_KEY_ATTR_ND */
+ nla_total_size(28) /* OVS_KEY_ATTR_ND */
+ nla_total_size(2); /* OVS_KEY_ATTR_IPV6_EXTHDRS */
}
static const struct ovs_len_tbl ovs_vxlan_ext_key_lens[OVS_VXLAN_EXT_MAX + 1] = {
@ -437,6 +438,8 @@ static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
.len = sizeof(struct ovs_key_ct_tuple_ipv6) },
[OVS_KEY_ATTR_NSH] = { .len = OVS_ATTR_NESTED,
.next = ovs_nsh_key_attr_lens, },
[OVS_KEY_ATTR_IPV6_EXTHDRS] = {
.len = sizeof(struct ovs_key_ipv6_exthdrs) },
};
static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
@ -1597,6 +1600,17 @@ static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
}
if (attrs & (1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS)) {
const struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key;
ipv6_exthdrs_key = nla_data(a[OVS_KEY_ATTR_IPV6_EXTHDRS]);
SW_FLOW_KEY_PUT(match, ipv6.exthdrs,
ipv6_exthdrs_key->hdrs, is_mask);
attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6_EXTHDRS);
}
if (attrs & (1 << OVS_KEY_ATTR_ARP)) {
const struct ovs_key_arp *arp_key;
@ -2099,6 +2113,7 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
ipv4_key->ipv4_frag = output->ip.frag;
} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
struct ovs_key_ipv6 *ipv6_key;
struct ovs_key_ipv6_exthdrs *ipv6_exthdrs_key;
nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
if (!nla)
@ -2113,6 +2128,13 @@ 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;
nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6_EXTHDRS,
sizeof(*ipv6_exthdrs_key));
if (!nla)
goto nla_put_failure;
ipv6_exthdrs_key = nla_data(nla);
ipv6_exthdrs_key->hdrs = 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;