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packets: add compose_nd_ra

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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 <zealokii@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Zong Kai LI
2017-05-04 20:42:30 +05:30
committed by Ben Pfaff
parent 674ebdd14f
commit b24ab67c2d
3 changed files with 145 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
AUTHORS.rst
View File

@@ -325,6 +325,7 @@ Yuanhan Liu yuanhan.liu@linux.intel.com
ZhengLingyun konghuarukhr@163.com
Zoltán Balogh zoltan.balogh@ericsson.com
Zoltan Kiss zoltan.kiss@citrix.com
Zongkai LI zealokii@gmail.com
Zhi Yong Wu zwu.kernel@gmail.com
Zang MingJie zealot0630@gmail.com
nickcooper-zhangtonghao nickcooper-zhangtonghao@opencloud.tech

81
lib/packets.c
View File

@@ -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)
@@ -1432,6 +1433,86 @@ 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(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)
{
/* 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);
struct ovs_ra_msg *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;
struct ovs_nd_opt *lla_opt = ra->options;
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. */
struct ovs_nd_mtu_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;
put_16aligned_be32(&mtu_opt->mtu, mtu);
}
ra->icmph.icmp6_cksum = 0;
uint32_t 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 = dp_packet_put_uninit(b, sizeof *b);
prefix_opt->type = ND_OPT_PREFIX_INFORMATION;
prefix_opt->len = 4;
prefix_opt->prefix_len = plen;
prefix_opt->la_flags = la_flags;
put_16aligned_be32(&prefix_opt->valid_lifetime, valid_lifetime);
put_16aligned_be32(&prefix_opt->preferred_lifetime, preferred_lifetime);
put_16aligned_be32(&prefix_opt->reserved, 0);
memcpy(prefix_opt->prefix.be32, prefix.be32, sizeof(ovs_be32[4]));
ra->icmph.icmp6_cksum = 0;
uint32_t 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)
{

66
lib/packets.h
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@@ -897,12 +897,39 @@ uint16_t packet_csum_upperlayer6(const struct ovs_16aligned_ip6_hdr *,
* ND options are always a multiple of 8 bytes in size. */
#define ND_OPT_LEN 8
struct ovs_nd_opt {
uint8_t nd_opt_type; /* Values defined in icmp6.h */
uint8_t nd_opt_len; /* in units of 8 octets (the size of this struct) */
struct eth_addr nd_opt_mac; /* Ethernet address in the case of SLL or TLL options */
uint8_t nd_opt_type; /* One of ND_OPT_*. */
uint8_t nd_opt_len;
struct eth_addr nd_opt_mac;
};
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; /* Always 4. */
uint8_t prefix_len;
uint8_t la_flags; /* ND_PREFIX_* flags. */
ovs_16aligned_be32 valid_lifetime;
ovs_16aligned_be32 preferred_lifetime;
ovs_16aligned_be32 reserved; /* Always 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; /* Always 1. */
ovs_be16 reserved; /* Always 0. */
ovs_16aligned_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)
{
@@ -1234,6 +1281,19 @@ 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(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);