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rtadvd(8): support PREF64 (RFC 8781)
PREF64 allows a router to advertise the network's NAT64 prefix, allowing clients to auto-configure CLAT. This makes it possible to deploy IPv6-only or IPv6-mostly client access networks without the need for DNS64. Reviewed by: imp, glebius (prior suggetions done) Pull Request: https://github.com/freebsd/freebsd-src/pull/1206
This commit is contained in:
Lexi Winter
Warner Losh
parent
1e8eb413f6
commit
77f06c476c
@ -912,6 +912,58 @@ getconfig(struct ifinfo *ifi)
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}
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free(dns);
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}
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/*
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* handle pref64
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*/
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rai->rai_pref64.p64_enabled = false;
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if ((addr = (char *)agetstr("pref64", &bp))) {
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if (inet_pton(AF_INET6, addr, &rai->rai_pref64.p64_prefix) != 1) {
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syslog(LOG_ERR, "<%s> inet_pton failed for %s",
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__func__, addr);
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} else {
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rai->rai_pref64.p64_enabled = true;
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switch (val64 = agetnum("pref64len")) {
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case -1:
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case 96:
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rai->rai_pref64.p64_plc = 0;
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break;
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case 64:
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rai->rai_pref64.p64_plc = 1;
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break;
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case 56:
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rai->rai_pref64.p64_plc = 2;
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break;
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case 48:
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rai->rai_pref64.p64_plc = 3;
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break;
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case 40:
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rai->rai_pref64.p64_plc = 4;
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break;
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case 32:
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rai->rai_pref64.p64_plc = 5;
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break;
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default:
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syslog(LOG_ERR, "prefix length %" PRIi64
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"on %s is invalid; disabling PREF64",
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val64, ifi->ifi_ifname);
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rai->rai_pref64.p64_enabled = 0;
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break;
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}
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/* This logic is from RFC 8781 section 4.1. */
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val64 = agetnum("pref64lifetime");
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if (val64 == -1)
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val64 = rai->rai_lifetime * 3;
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if (val64 > 65528)
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val64 = 65528;
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val64 = (val64 + 7) / 8;
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rai->rai_pref64.p64_sl = (uint16_t) (uint64_t) val64;
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}
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}
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/* construct the sending packet */
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make_packet(rai);
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@ -1334,6 +1386,7 @@ make_packet(struct rainfo *rai)
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struct rdnss *rdn;
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struct nd_opt_dnssl *ndopt_dnssl;
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struct dnssl *dns;
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struct nd_opt_pref64 *ndopt_pref64;
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size_t len;
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struct prefix *pfx;
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struct ifinfo *ifi;
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@ -1355,6 +1408,8 @@ make_packet(struct rainfo *rai)
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packlen += sizeof(struct nd_opt_prefix_info) * rai->rai_pfxs;
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if (rai->rai_linkmtu)
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packlen += sizeof(struct nd_opt_mtu);
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if (rai->rai_pref64.p64_enabled)
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packlen += sizeof(struct nd_opt_pref64);
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TAILQ_FOREACH(rti, &rai->rai_route, rti_next)
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packlen += sizeof(struct nd_opt_route_info) +
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@ -1435,6 +1490,19 @@ make_packet(struct rainfo *rai)
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buf += sizeof(struct nd_opt_mtu);
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}
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if (rai->rai_pref64.p64_enabled) {
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ndopt_pref64 = (struct nd_opt_pref64 *)buf;
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ndopt_pref64->nd_opt_pref64_type = ND_OPT_PREF64;
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ndopt_pref64->nd_opt_pref64_len = 2;
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ndopt_pref64->nd_opt_pref64_sl_plc =
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(htons(rai->rai_pref64.p64_sl << 3)) |
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htons((rai->rai_pref64.p64_plc & 0x7));
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memcpy(&ndopt_pref64->nd_opt_prefix[0],
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&rai->rai_pref64.p64_prefix,
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sizeof(ndopt_pref64->nd_opt_prefix));
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buf += sizeof(struct nd_opt_pref64);
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}
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TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
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uint32_t vltime, pltime;
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struct timespec now;
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@ -428,6 +428,24 @@ DNS search list entries.
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The default value is 3/2 of the interval time.
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.El
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.Pp
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The following items are for PREF64 discovery
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.Pq RFC 8781 ,
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which will advertise the network's NAT64 prefix to clients.
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These items are optional.
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.Bl -tag -width indent
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.It Cm \&pref64
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(str) The prefix to advertise in the PREF64 option.
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.It Cm \&pref64len
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(num) The length of the PREF64 prefix.
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This must be 96, 64, 56, 48, 40, or 32.
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If not specified, the default is 96.
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.It Cm \&pref64lifetime
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(num) The prefix lifetime to advertise in the PREF64 option.
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This should be at least as long as the RA lifetime, but cannot be greater
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than 65528.
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If not specified, the default is the RA lifetime, or 65528, whichever is lower.
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.El
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.Pp
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You can also refer one line from another by using
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.Cm tc
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capability.
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@ -32,6 +32,8 @@
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* SUCH DAMAGE.
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*/
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#include <stdbool.h>
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#define ELM_MALLOC(p,error_action) \
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do { \
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p = malloc(sizeof(*p)); \
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@ -148,6 +150,14 @@ struct rdnss {
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uint32_t rd_ltime; /* number of seconds valid */
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};
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struct pref64 {
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TAILQ_ENTRY(pref64) p64_next;
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bool p64_enabled;
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uint16_t p64_plc; /* prefix length code */
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uint16_t p64_sl; /* scaled lifetime */
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struct in6_addr p64_prefix;
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};
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/*
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* The maximum length of a domain name in a DNS search list is calculated
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* by a domain name + length fields per 63 octets + a zero octet at
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@ -217,6 +227,7 @@ struct rainfo {
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/* actual RA packet data and its length */
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size_t rai_ra_datalen;
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char *rai_ra_data;
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struct pref64 rai_pref64; /* PREF64 option */
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/* info about soliciter */
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TAILQ_HEAD(, soliciter) rai_soliciter; /* recent solication source */
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