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#pragma once
#include <stdbool.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/endian.h>
#include "../gtp/gtp.h"
#include "../gtp/pdp.h"
#define ICMPv6_OPT_TYPE_PREFIX_INFO 0x03
#define foreach_icmpv6_opt(icmpv6_pkt, icmpv6_len, opt_hdr) \
for (opt_hdr = (struct icmpv6_opt_hdr *)(icmpv6_pkt)->options; \
(uint8_t*)(opt_hdr) + sizeof(struct icmpv6_opt_hdr) <= (((uint8_t*)(icmpv6_pkt)) + (icmpv6_len)); \
opt_hdr = (struct icmpv6_opt_hdr*)((uint8_t*)(opt_hdr) + (opt_hdr)->len) \
)
struct icmpv6_hdr {
uint8_t type;
uint8_t code;
uint16_t csum;
} __attribute__ ((packed));
/* RFC4861 Section 4.1 */
struct icmpv6_rsol_hdr {
struct icmpv6_hdr hdr;
uint32_t reserved;
uint8_t options[0];
} __attribute__ ((packed));
/* RFC4861 Section 4.2 */
struct icmpv6_radv_hdr {
struct icmpv6_hdr hdr;
uint8_t cur_ho_limit;
#if OSMO_IS_LITTLE_ENDIAN
uint8_t res:6,
m:1,
o:1;
#else
uint8_t m:1,
o:1,
res:6;
#endif
uint16_t router_lifetime;
uint32_t reachable_time;
uint32_t retrans_timer;
uint8_t options[0];
} __attribute__ ((packed));
/* RFC4861 Section 4.6 */
struct icmpv6_opt_hdr {
uint8_t type;
/* length in units of 8 octets, including type+len! */
uint8_t len;
uint8_t data[0];
} __attribute__ ((packed));
/* RFC4861 Section 4.6.2 */
struct icmpv6_opt_prefix {
struct icmpv6_opt_hdr hdr;
uint8_t prefix_len;
#if OSMO_IS_LITTLE_ENDIAN
uint8_t res:6,
a:1,
l:1;
#else
uint8_t l:1,
a:1,
res:6;
#endif
uint32_t valid_lifetime;
uint32_t preferred_lifetime;
uint32_t res2;
uint8_t prefix[16];
} __attribute__ ((packed));
struct msgb *icmpv6_construct_rs(const struct in6_addr *saddr);
int handle_router_mcast(struct gsn_t *gsn, struct pdp_t *pdp,
const struct in6_addr *pdp_prefix,
const struct in6_addr *own_ll_addr,
const uint8_t *pack, unsigned len);
struct icmpv6_radv_hdr *icmpv6_validate_router_adv(const uint8_t *pack, unsigned len);
/* RFC3307 link-local scope multicast address */
extern const struct in6_addr all_router_mcast_addr;
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