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ICMPv6: Recognise ND option 38 (PREF64) #1109

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ICMPv6: Recognise ND option 38 (PREF64) #1109

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51 changes: 51 additions & 0 deletions print-icmp6.c
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Original file line number Diff line number Diff line change
Expand Up @@ -286,6 +286,7 @@ struct nd_opt_hdr { /* Neighbor discovery option header */
#define ND_OPT_ROUTE_INFO 24 /* RFC4191 */
#define ND_OPT_RDNSS 25
#define ND_OPT_DNSSL 31
#define ND_OPT_PREF64_INFORMATION 38 /* RFC8781 */

struct nd_opt_prefix_info { /* prefix information */
nd_uint8_t nd_opt_pi_type;
Expand Down Expand Up @@ -357,6 +358,13 @@ struct nd_opt_route_info { /* route info */
/* prefix follows */
};

struct nd_opt_pref64 { /* PREF64 option */
nd_uint8_t nd_opt_pref64_type;
nd_uint8_t nd_opt_pref64_len;
nd_uint16_t nd_opt_pref64_slplc; /* 13bit lft + 3bit PLC */
nd_uint32_t nd_opt_pref64_words[3]; /* highest 96 bits of prefix */
};

/*
* icmp6 namelookup
*/
Expand Down Expand Up @@ -475,6 +483,8 @@ struct rr_result { /* router renumbering result message */

static const char *get_rtpref(u_int);
static const char *get_lifetime(uint32_t);
static const char *get_pref64_lifetime(uint16_t);
static const char *get_pref64_len_repr(uint16_t);
static void print_lladdr(netdissect_options *ndo, const u_char *, size_t);
static int icmp6_opt_print(netdissect_options *ndo, const u_char *, int);
static void mld6_print(netdissect_options *ndo, const u_char *);
Expand Down Expand Up @@ -713,6 +723,7 @@ static const struct tok icmp6_opt_values[] = {
{ ND_OPT_ADVINTERVAL, "advertisement interval"},
{ ND_OPT_HOMEAGENT_INFO, "homeagent information"},
{ ND_OPT_ROUTE_INFO, "route info"},
{ ND_OPT_PREF64_INFORMATION, "pref64 info"},
{ 0, NULL }
};

Expand Down Expand Up @@ -753,6 +764,30 @@ get_lifetime(uint32_t v)
}
}

static const char *
get_pref64_lifetime(uint16_t v)
{
static char buf[12];

snprintf(buf, sizeof(buf), "%us", v & 0xfff8);
return buf;
}

static const char *
get_pref64_len_repr(uint16_t v)
{
const char *prefixlen_strunk = "??";
static const char *prefixlen_str[] = {
"96", "64", "56", "48", "40", "32"
};

v = v & 0x0007;
if (v < 6)
return prefixlen_str[v];
else
return prefixlen_strunk;
}

static void
print_lladdr(netdissect_options *ndo, const uint8_t *p, size_t l)
{
Expand Down Expand Up @@ -1383,10 +1418,12 @@ icmp6_opt_print(netdissect_options *ndo, const u_char *bp, int resid)
const struct nd_opt_advinterval *opa;
const struct nd_opt_homeagent_info *oph;
const struct nd_opt_route_info *opri;
const struct nd_opt_pref64 *op64;
const u_char *cp, *ep, *domp;
nd_ipv6 in6;
size_t l;
u_int i;
uint16_t w;

cp = bp;
/* 'ep' points to the end of available data. */
Expand Down Expand Up @@ -1496,6 +1533,20 @@ icmp6_opt_print(netdissect_options *ndo, const u_char *bp, int resid)
ND_PRINT(", lifetime=%s",
get_lifetime(GET_BE_U_4(opri->nd_opt_rti_lifetime)));
break;
case ND_OPT_PREF64_INFORMATION:
op64 = (const struct nd_opt_pref64 *)op;
if (opt_len != 2)
ND_PRINT("%s", "bad option length! ");
w = GET_BE_U_2(op64->nd_opt_pref64_slplc);
memset(&in6, 0, sizeof(in6));
GET_CPY_BYTES(&in6, op64->nd_opt_pref64_words,
sizeof(op64->nd_opt_pref64_words));
ND_PRINT("%s/%s (plc %u)",
ip6addr_string(ndo, (const u_char *)&in6),
get_pref64_len_repr(w),
w & 7);
ND_PRINT(", lifetime %s", get_pref64_lifetime(w));
break;
default:
if (ndo->ndo_vflag <= 1) {
print_unknown_data(ndo,cp+2,"\n\t ", (opt_len << 3) - 2); /* skip option header */
Expand Down
2 changes: 2 additions & 0 deletions tests/TESTLIST
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Original file line number Diff line number Diff line change
Expand Up @@ -224,6 +224,8 @@ icmpv6-rfc7112 icmpv6-rfc7112.pcap icmpv6-rfc7112.out
icmpv6-RFC2894-RR icmpv6-RFC2894-RR.pcap icmpv6-RFC2894-RR.out
icmpv6-RFC2894-RR-v icmpv6-RFC2894-RR.pcap icmpv6-RFC2894-RR-v.out -v
icmpv6-ni-flags icmpv6-ni-flags.pcap icmpv6-ni-flags.out
icmpv6-ra-pref64-v1 icmpv6-ra-pref64.pcap icmpv6-ra-pref64-v1.out -v
icmpv6-ra-pref64-v2 icmpv6-ra-pref64.pcap icmpv6-ra-pref64-v2.out -vv

# SPB tests
spb spb.pcap spb.out
Expand Down
20 changes: 20 additions & 0 deletions tests/icmpv6-ra-pref64-v1.out
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Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
1 20:18:21.401201 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
prefix info option (3), length 32 (4): 2001:db8:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
pref64 info option (38), length 16 (2): 2001:db8:1:64:ff9b::/96 (plc 0), lifetime 0s
2 20:18:24.401773 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
prefix info option (3), length 32 (4): 2001:db8:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
pref64 info option (38), length 16 (2): 2001:db8:0:64:ff9b::/?? (plc 6), lifetime 1800s
3 20:18:27.402345 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
prefix info option (3), length 32 (4): 2a00:f480:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
pref64 info option (38), length 16 (2): 2001:db8:0:64:ff9b::/96 (plc 0), lifetime 1800s
4 20:18:30.402917 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
prefix info option (3), length 32 (4): 2001:db8:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
pref64 info option (38), length 16 (2): 2001:db8:0:64:ff9b::/96 (plc 0), lifetime 65528s
36 changes: 36 additions & 0 deletions tests/icmpv6-ra-pref64-v2.out
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Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
1 20:18:21.401201 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
0x0000: e215 81b4 b945
prefix info option (3), length 32 (4): 2001:db8:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
0x0000: 4080 0000 0e10 0000 0708 0000 0000 2001
0x0010: 0db8 00cc 00dd 0000 0000 0000 0000
pref64 info option (38), length 16 (2): 2001:db8:1:64:ff9b::/96 (plc 0), lifetime 0s
0x0000: 0000 2001 0db8 0001 0064 ff9b 0000
2 20:18:24.401773 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
0x0000: e215 81b4 b945
prefix info option (3), length 32 (4): 2001:db8:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
0x0000: 4080 0000 0e10 0000 0708 0000 0000 2001
0x0010: 0db8 00cc 00dd 0000 0000 0000 0000
pref64 info option (38), length 16 (2): 2001:db8:0:64:ff9b::/?? (plc 6), lifetime 1800s
0x0000: 070e 2001 0db8 0000 0064 ff9b 0000
3 20:18:27.402345 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
0x0000: e215 81b4 b945
prefix info option (3), length 32 (4): 2a00:f480:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
0x0000: 4080 0000 0e10 0000 0708 0000 0000 2a00
0x0010: f480 00cc 00dd 0000 0000 0000 0000
pref64 info option (38), length 16 (2): 2001:db8:0:64:ff9b::/96 (plc 0), lifetime 1800s
0x0000: 0708 2001 0db8 0000 0064 ff9b 0000
4 20:18:30.402917 IP6 (flowlabel 0x9fc72, hlim 255, next-header ICMPv6 (58) payload length: 72) fe80::e015:81ff:feb4:b945 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 72
hop limit 80, Flags [other stateful], pref medium, router lifetime 500s, reachable time 0ms, retrans timer 0ms
source link-address option (1), length 8 (1): e2:15:81:b4:b9:45
0x0000: e215 81b4 b945
prefix info option (3), length 32 (4): 2001:db8:cc:dd::/64, Flags [onlink], valid time 3600s, pref. time 1800s
0x0000: 4080 0000 0e10 0000 0708 0000 0000 2001
0x0010: 0db8 00cc 00dd 0000 0000 0000 0000
pref64 info option (38), length 16 (2): 2001:db8:0:64:ff9b::/96 (plc 0), lifetime 65528s
0x0000: fff8 2001 0db8 0000 0064 ff9b 0000
Binary file added tests/icmpv6-ra-pref64.pcap
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