Implement Enhanced DAD algorithm for IPv6 described in
draft-ietf-6man-enhanced-dad-13. This basically adds a random nonce option (RFC 3971) to NS messages for DAD probe to detect a looped back packet. This looped back packet prevented DAD on some pseudo-interfaces which aggregates multiple L2 links such as lagg(4). The length of the nonce is set to 6 bytes. This algorithm can be disabled by setting net.inet6.ip6.dad_enhanced sysctl to 0 in a per-vnet basis. Reported by: hiren Reviewed by: ae Differential Revision: https://reviews.freebsd.org/D1835
This commit is contained in:
parent
1d0f6813ac
commit
11d8451df3
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=279531
@ -297,9 +297,11 @@ struct nd_opt_hdr { /* Neighbor discovery option header */
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#define ND_OPT_PREFIX_INFORMATION 3
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#define ND_OPT_REDIRECTED_HEADER 4
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#define ND_OPT_MTU 5
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#define ND_OPT_NONCE 14 /* RFC 3971 */
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#define ND_OPT_ROUTE_INFO 24 /* RFC 4191 */
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#define ND_OPT_RDNSS 25 /* RFC 6106 */
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#define ND_OPT_DNSSL 31 /* RFC 6106 */
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#define ND_OPT_MAX 31
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struct nd_opt_prefix_info { /* prefix information */
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u_int8_t nd_opt_pi_type;
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@ -330,6 +332,16 @@ struct nd_opt_mtu { /* MTU option */
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u_int32_t nd_opt_mtu_mtu;
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} __packed;
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#define ND_OPT_NONCE_LEN ((1 * 8) - 2)
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#if ((ND_OPT_NONCE_LEN + 2) % 8) != 0
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#error "(ND_OPT_NONCE_LEN + 2) must be a multiple of 8."
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#endif
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struct nd_opt_nonce { /* nonce option */
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u_int8_t nd_opt_nonce_type;
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u_int8_t nd_opt_nonce_len;
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u_int8_t nd_opt_nonce[ND_OPT_NONCE_LEN];
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} __packed;
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struct nd_opt_route_info { /* route info */
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u_int8_t nd_opt_rti_type;
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u_int8_t nd_opt_rti_len;
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@ -372,6 +372,7 @@ nd6_options(union nd_opts *ndopts)
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case ND_OPT_TARGET_LINKADDR:
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case ND_OPT_MTU:
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case ND_OPT_REDIRECTED_HEADER:
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case ND_OPT_NONCE:
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if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
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nd6log((LOG_INFO,
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"duplicated ND6 option found (type=%d)\n",
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@ -526,7 +527,7 @@ nd6_llinfo_timer(void *arg)
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ln->la_asked++;
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nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
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LLE_WUNLOCK(ln);
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nd6_ns_output(ifp, NULL, dst, ln, 0);
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nd6_ns_output(ifp, NULL, dst, ln, NULL);
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LLE_WLOCK(ln);
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} else {
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struct mbuf *m = ln->la_hold;
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@ -573,7 +574,7 @@ nd6_llinfo_timer(void *arg)
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ln->ln_state = ND6_LLINFO_PROBE;
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nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
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LLE_WUNLOCK(ln);
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nd6_ns_output(ifp, dst, dst, ln, 0);
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nd6_ns_output(ifp, dst, dst, ln, NULL);
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LLE_WLOCK(ln);
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} else {
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ln->ln_state = ND6_LLINFO_STALE; /* XXX */
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@ -585,7 +586,7 @@ nd6_llinfo_timer(void *arg)
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ln->la_asked++;
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nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
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LLE_WUNLOCK(ln);
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nd6_ns_output(ifp, dst, dst, ln, 0);
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nd6_ns_output(ifp, dst, dst, ln, NULL);
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LLE_WLOCK(ln);
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} else {
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EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
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@ -2084,7 +2085,7 @@ nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
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nd6_llinfo_settimer_locked(lle,
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(long)ND_IFINFO(ifp)->retrans * hz / 1000);
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LLE_WUNLOCK(lle);
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nd6_ns_output(ifp, NULL, &dst->sin6_addr, lle, 0);
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nd6_ns_output(ifp, NULL, &dst->sin6_addr, lle, NULL);
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} else {
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/* We did the lookup so we need to do the unlock here. */
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LLE_WUNLOCK(lle);
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@ -359,7 +359,7 @@ VNET_DECLARE(int, ip6_temp_regen_advance); /* seconds */
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#define V_ip6_temp_regen_advance VNET(ip6_temp_regen_advance)
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union nd_opts {
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struct nd_opt_hdr *nd_opt_array[8]; /* max = target address list */
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struct nd_opt_hdr *nd_opt_array[16]; /* max = ND_OPT_NONCE */
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struct {
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struct nd_opt_hdr *zero;
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struct nd_opt_hdr *src_lladdr;
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@ -367,6 +367,16 @@ union nd_opts {
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struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */
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struct nd_opt_rd_hdr *rh;
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struct nd_opt_mtu *mtu;
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struct nd_opt_hdr *__res6;
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struct nd_opt_hdr *__res7;
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struct nd_opt_hdr *__res8;
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struct nd_opt_hdr *__res9;
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struct nd_opt_hdr *__res10;
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struct nd_opt_hdr *__res11;
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struct nd_opt_hdr *__res12;
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struct nd_opt_hdr *__res13;
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struct nd_opt_nonce *nonce;
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struct nd_opt_hdr *__res15;
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struct nd_opt_hdr *search; /* multiple opts */
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struct nd_opt_hdr *last; /* multiple opts */
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int done;
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@ -379,6 +389,7 @@ union nd_opts {
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#define nd_opts_pi_end nd_opt_each.pi_end
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#define nd_opts_rh nd_opt_each.rh
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#define nd_opts_mtu nd_opt_each.mtu
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#define nd_opts_nonce nd_opt_each.nonce
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#define nd_opts_search nd_opt_each.search
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#define nd_opts_last nd_opt_each.last
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#define nd_opts_done nd_opt_each.done
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@ -425,7 +436,7 @@ void nd6_na_output(struct ifnet *, const struct in6_addr *,
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const struct in6_addr *, u_long, int, struct sockaddr *);
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void nd6_ns_input(struct mbuf *, int, int);
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void nd6_ns_output(struct ifnet *, const struct in6_addr *,
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const struct in6_addr *, struct llentry *, int);
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const struct in6_addr *, struct llentry *, uint8_t *);
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caddr_t nd6_ifptomac(struct ifnet *);
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void nd6_dad_init(void);
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void nd6_dad_start(struct ifaddr *, int);
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@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/libkern.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#include <sys/mbuf.h>
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@ -48,6 +49,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/queue.h>
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#include <sys/callout.h>
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@ -61,6 +63,7 @@ __FBSDID("$FreeBSD$");
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#ifdef RADIX_MPATH
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#include <net/radix_mpath.h>
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#endif
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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@ -79,7 +82,7 @@ __FBSDID("$FreeBSD$");
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#define SDL(s) ((struct sockaddr_dl *)s)
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struct dadq;
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static struct dadq *nd6_dad_find(struct ifaddr *);
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static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
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static void nd6_dad_add(struct dadq *dp);
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static void nd6_dad_del(struct dadq *dp);
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static void nd6_dad_rele(struct dadq *);
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@ -88,16 +91,21 @@ static void nd6_dad_stoptimer(struct dadq *);
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static void nd6_dad_timer(struct dadq *);
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static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
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static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
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static void nd6_dad_ns_input(struct ifaddr *);
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static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
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static void nd6_dad_na_input(struct ifaddr *);
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static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
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const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
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static VNET_DEFINE(int, dad_ignore_ns) = 0; /* ignore NS in DAD
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- specwise incorrect */
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static VNET_DEFINE(int, dad_enhanced) = 1;
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#define V_dad_enhanced VNET(dad_enhanced)
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SYSCTL_DECL(_net_inet6_ip6);
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SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(dad_enhanced), 0,
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"Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
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static VNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to
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transmit DAD packet */
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#define V_dad_ignore_ns VNET(dad_ignore_ns)
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#define V_dad_maxtry VNET(dad_maxtry)
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/*
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@ -321,7 +329,7 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
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* silently ignore it.
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*/
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if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
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nd6_dad_ns_input(ifa);
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nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
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goto freeit;
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}
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@ -382,12 +390,13 @@ nd6_ns_input(struct mbuf *m, int off, int icmp6len)
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* Based on RFC 2461
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* Based on RFC 2462 (duplicate address detection)
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*
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* ln - for source address determination
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* dad - duplicate address detection
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* ln - for source address determination
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* nonce - If non-NULL, NS is used for duplicate address detection and
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* the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
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*/
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void
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nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
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const struct in6_addr *taddr6, struct llentry *ln, int dad)
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const struct in6_addr *taddr6, struct llentry *ln, uint8_t *nonce)
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{
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struct mbuf *m;
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struct m_tag *mtag;
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@ -453,7 +462,7 @@ nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
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if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
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goto bad;
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}
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if (!dad) {
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if (nonce == NULL) {
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struct ifaddr *ifa;
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/*
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@ -550,7 +559,7 @@ nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
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* Multicast NS MUST add one add the option
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* Unicast NS SHOULD add one add the option
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*/
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if (!dad && (mac = nd6_ifptomac(ifp))) {
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if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
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int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
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struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
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/* 8 byte alignments... */
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@ -564,7 +573,26 @@ nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
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nd_opt->nd_opt_len = optlen >> 3;
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bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
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}
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/*
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* Add a Nonce option (RFC 3971) to detect looped back NS messages.
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* This behavior is documented as Enhanced Duplicate Address
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* Detection in draft-ietf-6man-enhanced-dad-13.
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* net.inet6.ip6.dad_enhanced=0 disables this.
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*/
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if (V_dad_enhanced != 0 && nonce != NULL) {
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int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
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struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
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/* 8-byte alignment is required. */
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optlen = (optlen + 7) & ~7;
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m->m_pkthdr.len += optlen;
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m->m_len += optlen;
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icmp6len += optlen;
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bzero((caddr_t)nd_opt, optlen);
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nd_opt->nd_opt_type = ND_OPT_NONCE;
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nd_opt->nd_opt_len = optlen >> 3;
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bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
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}
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ip6->ip6_plen = htons((u_short)icmp6len);
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nd_ns->nd_ns_cksum = 0;
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nd_ns->nd_ns_cksum =
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@ -579,7 +607,8 @@ nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
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m_tag_prepend(m, mtag);
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}
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ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
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ip6_output(m, NULL, &ro, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
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&im6o, NULL, NULL);
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icmp6_ifstat_inc(ifp, ifs6_out_msg);
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icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
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ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
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@ -1139,9 +1168,13 @@ struct dadq {
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int dad_ns_ocount; /* NS sent so far */
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int dad_ns_icount;
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int dad_na_icount;
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int dad_ns_lcount; /* looped back NS */
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struct callout dad_timer_ch;
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struct vnet *dad_vnet;
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u_int dad_refcnt;
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#define ND_OPT_NONCE_LEN32 \
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((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
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uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
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};
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static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
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@ -1174,16 +1207,34 @@ nd6_dad_del(struct dadq *dp)
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}
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static struct dadq *
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nd6_dad_find(struct ifaddr *ifa)
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nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
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{
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struct dadq *dp;
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char ip6buf[INET6_ADDRSTRLEN];
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DADQ_RLOCK();
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TAILQ_FOREACH(dp, &V_dadq, dad_list)
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if (dp->dad_ifa == ifa) {
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refcount_acquire(&dp->dad_refcnt);
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break;
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TAILQ_FOREACH(dp, &V_dadq, dad_list) {
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if (dp->dad_ifa != ifa)
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continue;
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/*
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* Skip if the nonce matches the received one.
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* +2 in the length is required because of type and
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* length fields are included in a header.
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*/
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if (n != NULL &&
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n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
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memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
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ND_OPT_NONCE_LEN) == 0) {
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log(LOG_ERR, "%s: a looped back NS message is "
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"detected during DAD for %s.\n",
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if_name(ifa->ifa_ifp),
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ip6_sprintf(ip6buf, IFA_IN6(ifa)));
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dp->dad_ns_lcount++;
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continue;
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}
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refcount_acquire(&dp->dad_refcnt);
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break;
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}
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DADQ_RUNLOCK();
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return (dp);
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@ -1261,7 +1312,7 @@ nd6_dad_start(struct ifaddr *ifa, int delay)
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}
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if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)
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return;
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if ((dp = nd6_dad_find(ifa)) != NULL) {
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if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
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/* DAD already in progress */
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nd6_dad_rele(dp);
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return;
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@ -1293,6 +1344,7 @@ nd6_dad_start(struct ifaddr *ifa, int delay)
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dp->dad_count = V_ip6_dad_count;
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dp->dad_ns_icount = dp->dad_na_icount = 0;
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dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
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dp->dad_ns_lcount = 0;
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refcount_init(&dp->dad_refcnt, 1);
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nd6_dad_add(dp);
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if (delay == 0) {
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@ -1312,7 +1364,7 @@ nd6_dad_stop(struct ifaddr *ifa)
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{
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struct dadq *dp;
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dp = nd6_dad_find(ifa);
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dp = nd6_dad_find(ifa, NULL);
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if (!dp) {
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/* DAD wasn't started yet */
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return;
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@ -1325,7 +1377,7 @@ nd6_dad_stop(struct ifaddr *ifa)
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* we were waiting for it to stop, so re-do the lookup.
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*/
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nd6_dad_rele(dp);
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if (nd6_dad_find(ifa) == NULL)
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if (nd6_dad_find(ifa, NULL) == NULL)
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return;
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nd6_dad_del(dp);
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@ -1421,9 +1473,10 @@ nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
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char ip6buf[INET6_ADDRSTRLEN];
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log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
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"NS in/out=%d/%d, NA in=%d\n",
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"NS in/out/loopback=%d/%d/%d, NA in=%d\n",
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if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
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dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
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dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
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dp->dad_na_icount);
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ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
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ia->ia6_flags |= IN6_IFF_DUPLICATED;
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@ -1475,6 +1528,8 @@ nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
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{
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struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
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struct ifnet *ifp = ifa->ifa_ifp;
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uint8_t *nonce;
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int i;
|
||||
|
||||
dp->dad_ns_tcount++;
|
||||
if ((ifp->if_flags & IFF_UP) == 0) {
|
||||
@ -1485,11 +1540,25 @@ nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
|
||||
}
|
||||
|
||||
dp->dad_ns_ocount++;
|
||||
nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
|
||||
if (V_dad_enhanced != 0) {
|
||||
for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
|
||||
dp->dad_nonce[i] = arc4random();
|
||||
nonce = (uint8_t *)&dp->dad_nonce[0];
|
||||
/*
|
||||
* XXXHRS: Note that in the case that
|
||||
* DupAddrDetectTransmits > 1, multiple NS messages with
|
||||
* different nonces can be looped back in an unexpected
|
||||
* order. The current implementation recognizes only
|
||||
* the latest nonce on the sender side. Practically it
|
||||
* should work well in almost all cases.
|
||||
*/
|
||||
} else
|
||||
nonce = NULL;
|
||||
nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, nonce);
|
||||
}
|
||||
|
||||
static void
|
||||
nd6_dad_ns_input(struct ifaddr *ifa)
|
||||
nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
|
||||
{
|
||||
struct in6_ifaddr *ia;
|
||||
struct ifnet *ifp;
|
||||
@ -1502,22 +1571,13 @@ nd6_dad_ns_input(struct ifaddr *ifa)
|
||||
ia = (struct in6_ifaddr *)ifa;
|
||||
ifp = ifa->ifa_ifp;
|
||||
taddr6 = &ia->ia_addr.sin6_addr;
|
||||
dp = nd6_dad_find(ifa);
|
||||
/* Ignore Nonce option when Enhanced DAD is disabled. */
|
||||
if (V_dad_enhanced == 0)
|
||||
ndopt_nonce = NULL;
|
||||
dp = nd6_dad_find(ifa, ndopt_nonce);
|
||||
if (dp == NULL)
|
||||
return;
|
||||
|
||||
/* Quickhack - completely ignore DAD NS packets */
|
||||
if (V_dad_ignore_ns) {
|
||||
char ip6buf[INET6_ADDRSTRLEN];
|
||||
nd6log((LOG_INFO,
|
||||
"nd6_dad_ns_input: ignoring DAD NS packet for "
|
||||
"address %s(%s)\n", ip6_sprintf(ip6buf, taddr6),
|
||||
if_name(ifa->ifa_ifp)));
|
||||
return;
|
||||
}
|
||||
|
||||
/* XXX more checks for loopback situation - see nd6_dad_timer too */
|
||||
|
||||
dp->dad_ns_icount++;
|
||||
nd6_dad_rele(dp);
|
||||
}
|
||||
@ -1530,7 +1590,7 @@ nd6_dad_na_input(struct ifaddr *ifa)
|
||||
if (ifa == NULL)
|
||||
panic("ifa == NULL in nd6_dad_na_input");
|
||||
|
||||
dp = nd6_dad_find(ifa);
|
||||
dp = nd6_dad_find(ifa, NULL);
|
||||
if (dp != NULL) {
|
||||
dp->dad_na_icount++;
|
||||
nd6_dad_rele(dp);
|
||||
|
Loading…
Reference in New Issue
Block a user