@@ -35,6 +35,7 @@
const struct in6_addr in6addr_exact = IN6ADDR_EXACT_INIT;
const struct in6_addr in6addr_all_hosts = IN6ADDR_ALL_HOSTS_INIT;
+const struct in6_addr in6addr_all_routers = IN6ADDR_ALL_ROUTERS_INIT;
struct in6_addr
flow_tnl_dst(const struct flow_tnl *tnl)
@@ -1428,6 +1429,93 @@ compose_nd_na(struct dp_packet *b,
ND_MSG_LEN + ND_OPT_LEN));
}
+/* Compose an IPv6 Neighbor Discovery Router Advertisement message with
+ * Source Link-layer Address Option and MTU Option.
+ * Caller can call packet_put_ra_prefix_opt to append Prefix Information
+ * Options to composed messags in 'b'. */
+void
+compose_nd_ra_with_sll_mtu_opts(struct dp_packet *b,
+ const struct eth_addr eth_src,
+ const struct eth_addr eth_dst,
+ const struct in6_addr *ipv6_src,
+ const struct in6_addr *ipv6_dst,
+ uint8_t cur_hop_limit, uint8_t mo_flags,
+ ovs_be16 router_lt, ovs_be32 reachable_time,
+ ovs_be32 retrans_timer, ovs_be32 mtu)
+{
+ struct ovs_ra_msg *ra;
+ struct ovs_nd_mtu_opt *mtu_opt;
+ struct ovs_nd_opt *lla_opt;
+ uint32_t icmp_csum;
+
+ /* Don't compose Router Advertisement packet with MTU Option if mtu
+ * value is 0. */
+ bool with_mtu = mtu != 0;
+ size_t mtu_opt_len = with_mtu ? ND_MTU_OPT_LEN : 0;
+
+ eth_compose(b, eth_dst, eth_src, ETH_TYPE_IPV6, IPV6_HEADER_LEN);
+ ra = compose_ipv6(b, IPPROTO_ICMPV6, ipv6_src, ipv6_dst, 0, 0, 255,
+ RA_MSG_LEN + ND_OPT_LEN + mtu_opt_len);
+
+ ra->icmph.icmp6_type = ND_ROUTER_ADVERT;
+ ra->icmph.icmp6_code = 0;
+ ra->cur_hop_limit = cur_hop_limit;
+ ra->mo_flags = mo_flags;
+ ra->router_lifetime = router_lt;
+ ra->reachable_time = reachable_time;
+ ra->retrans_timer = retrans_timer;
+
+ lla_opt = &ra->options[0];
+ lla_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
+ lla_opt->nd_opt_len = 1;
+ lla_opt->nd_opt_mac = eth_src;
+
+ if (with_mtu) {
+ /* ovs_nd_mtu_opt has the same size with ovs_nd_opt. */
+ mtu_opt = (struct ovs_nd_mtu_opt *)(lla_opt + 1);
+ mtu_opt->type = ND_OPT_MTU;
+ mtu_opt->len = 1;
+ mtu_opt->reserved = 0;
+ mtu_opt->mtu = mtu;
+ }
+
+ ra->icmph.icmp6_cksum = 0;
+ icmp_csum = packet_csum_pseudoheader6(dp_packet_l3(b));
+ ra->icmph.icmp6_cksum = csum_finish(csum_continue(
+ icmp_csum, ra, RA_MSG_LEN + ND_OPT_LEN + mtu_opt_len));
+}
+
+/* Append an IPv6 Neighbor Discovery Prefix Information option to a
+ * Router Advertisement message. */
+void
+packet_put_ra_prefix_opt(struct dp_packet *b,
+ uint8_t plen, uint8_t la_flags, ovs_be32 valid_lifetime,
+ ovs_be32 preferred_lifetime, const ovs_be128 prefix)
+{
+ size_t prev_l4_size = dp_packet_l4_size(b);
+ struct ip6_hdr *nh = dp_packet_l3(b);
+ nh->ip6_plen = htons(prev_l4_size + ND_PREFIX_OPT_LEN);
+
+ struct ovs_ra_msg *ra = dp_packet_l4(b);
+ struct ovs_nd_prefix_opt *prefix_opt;
+ uint32_t icmp_csum;
+
+ prefix_opt = dp_packet_put_uninit(b, sizeof(struct ovs_nd_prefix_opt));
+ prefix_opt->type = ND_OPT_PREFIX_INFORMATION;
+ prefix_opt->len = 4;
+ prefix_opt->prefix_len = plen;
+ prefix_opt->la_flags = la_flags;
+ prefix_opt->valid_lifetime = valid_lifetime;
+ prefix_opt->preferred_lifetime = preferred_lifetime;
+ prefix_opt->reserved = 0;
+ memcpy(prefix_opt->prefix.be32, prefix.be32, sizeof(ovs_be32[4]));
+
+ ra->icmph.icmp6_cksum = 0;
+ icmp_csum = packet_csum_pseudoheader6(dp_packet_l3(b));
+ ra->icmph.icmp6_cksum = csum_finish(csum_continue(
+ icmp_csum, ra, prev_l4_size + ND_PREFIX_OPT_LEN));
+}
+
uint32_t
packet_csum_pseudoheader(const struct ip_header *ip)
{
@@ -903,6 +903,33 @@ struct ovs_nd_opt {
};
BUILD_ASSERT_DECL(ND_OPT_LEN == sizeof(struct ovs_nd_opt));
+/* Neighbor Discovery option: Prefix Information. */
+#define ND_PREFIX_OPT_LEN 32
+struct ovs_nd_prefix_opt {
+ uint8_t type; /* ND_OPT_PREFIX_INFORMATION */
+ uint8_t len; /* The length of Prefix Information Option shoulud be 4. */
+ uint8_t prefix_len;
+ uint8_t la_flags; /* ND_PREFIX_ON_LINK and ND_PREFIX_AUTONOMOUS_ADDRESS flags. */
+ ovs_be32 valid_lifetime;
+ ovs_be32 preferred_lifetime;
+ ovs_be32 reserved; /* Always should be 0. */
+ union ovs_16aligned_in6_addr prefix;
+};
+BUILD_ASSERT_DECL(ND_PREFIX_OPT_LEN == sizeof(struct ovs_nd_prefix_opt));
+
+#define ND_PREFIX_ON_LINK 0x80
+#define ND_PREFIX_AUTONOMOUS_ADDRESS 0x40
+
+/* Neighbor Discovery option: MTU. */
+#define ND_MTU_OPT_LEN 8
+struct ovs_nd_mtu_opt {
+ uint8_t type; /* ND_OPT_MTU */
+ uint8_t len; /* The length of MTU Option shoulud be 1. */
+ ovs_be16 reserved; /* Always should be 0. */
+ ovs_be32 mtu;
+};
+BUILD_ASSERT_DECL(ND_MTU_OPT_LEN == sizeof(struct ovs_nd_mtu_opt));
+
/* Like struct nd_msg (from ndisc.h), but whereas that struct requires 32-bit
* alignment, this one only requires 16-bit alignment. */
#define ND_MSG_LEN 24
@@ -914,10 +941,26 @@ struct ovs_nd_msg {
};
BUILD_ASSERT_DECL(ND_MSG_LEN == sizeof(struct ovs_nd_msg));
+/* Neighbor Discovery packet flags. */
#define ND_RSO_ROUTER 0x80000000
#define ND_RSO_SOLICITED 0x40000000
#define ND_RSO_OVERRIDE 0x20000000
+#define RA_MSG_LEN 16
+struct ovs_ra_msg {
+ struct icmp6_header icmph;
+ uint8_t cur_hop_limit;
+ uint8_t mo_flags; /* ND_RA_MANAGED_ADDRESS and ND_RA_OTHER_CONFIG flags. */
+ ovs_be16 router_lifetime;
+ ovs_be32 reachable_time;
+ ovs_be32 retrans_timer;
+ struct ovs_nd_opt options[0];
+};
+BUILD_ASSERT_DECL(RA_MSG_LEN == sizeof(struct ovs_ra_msg));
+
+#define ND_RA_MANAGED_ADDRESS 0x80
+#define ND_RA_OTHER_CONFIG 0x40
+
/*
* Use the same struct for MLD and MLD2, naming members as the defined fields in
* in the corresponding version of the protocol, though they are reserved in the
@@ -972,6 +1015,10 @@ extern const struct in6_addr in6addr_all_hosts;
#define IN6ADDR_ALL_HOSTS_INIT { { { 0xff,0x02,0x00,0x00,0x00,0x00,0x00,0x00, \
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01 } } }
+extern const struct in6_addr in6addr_all_routers;
+#define IN6ADDR_ALL_ROUTERS_INIT { { { 0xff,0x02,0x00,0x00,0x00,0x00,0x00,0x00, \
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02 } } }
+
static inline bool ipv6_addr_equals(const struct in6_addr *a,
const struct in6_addr *b)
{
@@ -1196,6 +1243,18 @@ void compose_nd_na(struct dp_packet *, const struct eth_addr eth_src,
const struct in6_addr *ipv6_src,
const struct in6_addr *ipv6_dst,
ovs_be32 rso_flags);
+void compose_nd_ra_with_sll_mtu_opts(struct dp_packet *,
+ const struct eth_addr eth_src,
+ const struct eth_addr eth_dst,
+ const struct in6_addr *ipv6_src,
+ const struct in6_addr *ipv6_dst,
+ uint8_t cur_hop_limit, uint8_t mo_flags,
+ ovs_be16 router_lt, ovs_be32 reachable_time,
+ ovs_be32 retrans_timer, ovs_be32 mtu);
+void packet_put_ra_prefix_opt(struct dp_packet *,
+ uint8_t plen, uint8_t la_flags,
+ ovs_be32 valid_lifetime, ovs_be32 preferred_lifetime,
+ const ovs_be128 router_prefix);
uint32_t packet_csum_pseudoheader(const struct ip_header *);
void IP_ECN_set_ce(struct dp_packet *pkt, bool is_ipv6);