Please ignore this patch. The updated one is here -
https://mail.openvswitch.org/pipermail/ovs-dev/2017-March/330135.html
Thanks
Numan
On Thu, Mar 23, 2017 at 11:33 AM, <nusid...@redhat.com> wrote:
> From: Zong Kai LI <zealo...@gmail.com>
>
> This patch introduces methods to compose a Router Advertisement (RA)
> packet,
> introduces flags for RA. RA packet composed structures against
> specification
> in RFC4861.
>
> Caller can use compse_nd_ra_with_sll_mtu_opts to compose a RA packet with
> Source Link-layer Address Option and MTU Option.
>
> Caller can use packet_put_ra_prefix_opt to append a Prefix Information
> Option
> to a RA packet.
>
> Signed-off-by: Zongkai LI <zealo...@gmail.com>
> ---
> lib/packets.c | 88 ++++++++++++++++++++++++++++++
> +++++++++++++++++++++++++++++
> lib/packets.h | 59 +++++++++++++++++++++++++++++++++++++++
> 2 files changed, 147 insertions(+)
>
> diff --git a/lib/packets.c b/lib/packets.c
> index 94e7d87..dbe5105 100644
> --- a/lib/packets.c
> +++ b/lib/packets.c
> @@ -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)
> {
> diff --git a/lib/packets.h b/lib/packets.h
> index a5a483b..b285185 100644
> --- a/lib/packets.h
> +++ b/lib/packets.h
> @@ -858,6 +858,33 @@ 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
> @@ -869,10 +896,26 @@ 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
> @@ -927,6 +970,10 @@ 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)
> {
> @@ -1131,6 +1178,18 @@ 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);
>
> --
> 2.9.3
>
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> d...@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
>
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