From 3489e3b6396ee9944a6a2e19e675ca54c36993b4 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Wed, 22 Aug 2018 14:59:50 +0200 Subject: Update to FreeBSD head 2018-09-17 Git mirror commit 6c2192b1ef8c50788c751f878552526800b1e319. Update #3472. --- freebsd/sys/net/if_gre.c | 668 ++++++++++++----------------------------------- 1 file changed, 172 insertions(+), 496 deletions(-) (limited to 'freebsd/sys/net/if_gre.c') diff --git a/freebsd/sys/net/if_gre.c b/freebsd/sys/net/if_gre.c index 0bff9bc9..5ff41259 100644 --- a/freebsd/sys/net/if_gre.c +++ b/freebsd/sys/net/if_gre.c @@ -4,7 +4,7 @@ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 1998 The NetBSD Foundation, Inc. - * Copyright (c) 2014 Andrey V. Elsukov + * Copyright (c) 2014, 2018 Andrey V. Elsukov * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation @@ -43,17 +43,13 @@ __FBSDID("$FreeBSD$"); #include #include -#include #include #include -#include #include #include #include #include #include -#include -#include #include #include #include @@ -72,7 +68,6 @@ __FBSDID("$FreeBSD$"); #include #ifdef INET -#include #include #include #include @@ -82,7 +77,6 @@ __FBSDID("$FreeBSD$"); #include #include #include -#include #endif #include @@ -93,24 +87,16 @@ __FBSDID("$FreeBSD$"); #include #define GREMTU 1476 + static const char grename[] = "gre"; -static MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation"); -static VNET_DEFINE(struct mtx, gre_mtx); -#define V_gre_mtx VNET(gre_mtx) -#define GRE_LIST_LOCK_INIT(x) mtx_init(&V_gre_mtx, "gre_mtx", NULL, \ - MTX_DEF) -#define GRE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gre_mtx) -#define GRE_LIST_LOCK(x) mtx_lock(&V_gre_mtx) -#define GRE_LIST_UNLOCK(x) mtx_unlock(&V_gre_mtx) - -static VNET_DEFINE(LIST_HEAD(, gre_softc), gre_softc_list); -#define V_gre_softc_list VNET(gre_softc_list) +MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation"); + static struct sx gre_ioctl_sx; SX_SYSINIT(gre_ioctl_sx, &gre_ioctl_sx, "gre_ioctl"); static int gre_clone_create(struct if_clone *, int, caddr_t); static void gre_clone_destroy(struct ifnet *); -static VNET_DEFINE(struct if_clone *, gre_cloner); +VNET_DEFINE_STATIC(struct if_clone *, gre_cloner); #define V_gre_cloner VNET(gre_cloner) static void gre_qflush(struct ifnet *); @@ -118,11 +104,7 @@ static int gre_transmit(struct ifnet *, struct mbuf *); static int gre_ioctl(struct ifnet *, u_long, caddr_t); static int gre_output(struct ifnet *, struct mbuf *, const struct sockaddr *, struct route *); - -static void gre_updatehdr(struct gre_softc *); -static int gre_set_tunnel(struct ifnet *, struct sockaddr *, - struct sockaddr *); -static void gre_delete_tunnel(struct ifnet *); +static void gre_delete_tunnel(struct gre_softc *); SYSCTL_DECL(_net_link); static SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, @@ -139,7 +121,7 @@ static SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0, #define MAX_GRE_NEST 1 #endif -static VNET_DEFINE(int, max_gre_nesting) = MAX_GRE_NEST; +VNET_DEFINE_STATIC(int, max_gre_nesting) = MAX_GRE_NEST; #define V_max_gre_nesting VNET(max_gre_nesting) SYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(max_gre_nesting), 0, "Max nested tunnels"); @@ -147,10 +129,15 @@ SYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, static void vnet_gre_init(const void *unused __unused) { - LIST_INIT(&V_gre_softc_list); - GRE_LIST_LOCK_INIT(); + V_gre_cloner = if_clone_simple(grename, gre_clone_create, gre_clone_destroy, 0); +#ifdef INET + in_gre_init(); +#endif +#ifdef INET6 + in6_gre_init(); +#endif } VNET_SYSINIT(vnet_gre_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, vnet_gre_init, NULL); @@ -160,7 +147,12 @@ vnet_gre_uninit(const void *unused __unused) { if_clone_detach(V_gre_cloner); - GRE_LIST_LOCK_DESTROY(); +#ifdef INET + in_gre_uninit(); +#endif +#ifdef INET6 + in6_gre_uninit(); +#endif } VNET_SYSUNINIT(vnet_gre_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, vnet_gre_uninit, NULL); @@ -177,7 +169,6 @@ gre_clone_create(struct if_clone *ifc, int unit, caddr_t params) sc->gre_fibnum = BSD_DEFAULT_FIB; #endif /* __rtems__ */ GRE2IFP(sc) = if_alloc(IFT_TUNNEL); - GRE_LOCK_INIT(sc); GRE2IFP(sc)->if_softc = sc; if_initname(GRE2IFP(sc), grename, unit); @@ -191,9 +182,6 @@ gre_clone_create(struct if_clone *ifc, int unit, caddr_t params) GRE2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; if_attach(GRE2IFP(sc)); bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t)); - GRE_LIST_LOCK(); - LIST_INSERT_HEAD(&V_gre_softc_list, sc, gre_list); - GRE_LIST_UNLOCK(); return (0); } @@ -204,33 +192,22 @@ gre_clone_destroy(struct ifnet *ifp) sx_xlock(&gre_ioctl_sx); sc = ifp->if_softc; - gre_delete_tunnel(ifp); - GRE_LIST_LOCK(); - LIST_REMOVE(sc, gre_list); - GRE_LIST_UNLOCK(); + gre_delete_tunnel(sc); bpfdetach(ifp); if_detach(ifp); ifp->if_softc = NULL; sx_xunlock(&gre_ioctl_sx); + GRE_WAIT(); if_free(ifp); - GRE_LOCK_DESTROY(sc); free(sc, M_GRE); } static int gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { - GRE_RLOCK_TRACKER; struct ifreq *ifr = (struct ifreq *)data; - struct sockaddr *src, *dst; struct gre_softc *sc; -#ifdef INET - struct sockaddr_in *sin = NULL; -#endif -#ifdef INET6 - struct sockaddr_in6 *sin6 = NULL; -#endif uint32_t opt; int error; @@ -255,7 +232,6 @@ gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) case GREGPROTO: return (EOPNOTSUPP); } - src = dst = NULL; sx_xlock(&gre_ioctl_sx); sc = ifp->if_softc; if (sc == NULL) { @@ -264,189 +240,25 @@ gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) } error = 0; switch (cmd) { - case SIOCSIFPHYADDR: -#ifdef INET6 - case SIOCSIFPHYADDR_IN6: -#endif - error = EINVAL; - switch (cmd) { -#ifdef INET - case SIOCSIFPHYADDR: - src = (struct sockaddr *) - &(((struct in_aliasreq *)data)->ifra_addr); - dst = (struct sockaddr *) - &(((struct in_aliasreq *)data)->ifra_dstaddr); - break; -#endif -#ifdef INET6 - case SIOCSIFPHYADDR_IN6: - src = (struct sockaddr *) - &(((struct in6_aliasreq *)data)->ifra_addr); - dst = (struct sockaddr *) - &(((struct in6_aliasreq *)data)->ifra_dstaddr); - break; -#endif - default: - error = EAFNOSUPPORT; - goto end; - } - /* sa_family must be equal */ - if (src->sa_family != dst->sa_family || - src->sa_len != dst->sa_len) - goto end; - - /* validate sa_len */ - switch (src->sa_family) { -#ifdef INET - case AF_INET: - if (src->sa_len != sizeof(struct sockaddr_in)) - goto end; - break; -#endif -#ifdef INET6 - case AF_INET6: - if (src->sa_len != sizeof(struct sockaddr_in6)) - goto end; - break; -#endif - default: - error = EAFNOSUPPORT; - goto end; - } - /* check sa_family looks sane for the cmd */ - error = EAFNOSUPPORT; - switch (cmd) { -#ifdef INET - case SIOCSIFPHYADDR: - if (src->sa_family == AF_INET) - break; - goto end; -#endif -#ifdef INET6 - case SIOCSIFPHYADDR_IN6: - if (src->sa_family == AF_INET6) - break; - goto end; -#endif - } - error = EADDRNOTAVAIL; - switch (src->sa_family) { -#ifdef INET - case AF_INET: - if (satosin(src)->sin_addr.s_addr == INADDR_ANY || - satosin(dst)->sin_addr.s_addr == INADDR_ANY) - goto end; - break; -#endif -#ifdef INET6 - case AF_INET6: - if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr) - || - IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr)) - goto end; - /* - * Check validity of the scope zone ID of the - * addresses, and convert it into the kernel - * internal form if necessary. - */ - error = sa6_embedscope(satosin6(src), 0); - if (error != 0) - goto end; - error = sa6_embedscope(satosin6(dst), 0); - if (error != 0) - goto end; -#endif - } - error = gre_set_tunnel(ifp, src, dst); - break; case SIOCDIFPHYADDR: - gre_delete_tunnel(ifp); + if (sc->gre_family == 0) + break; + gre_delete_tunnel(sc); break; +#ifdef INET + case SIOCSIFPHYADDR: case SIOCGIFPSRCADDR: case SIOCGIFPDSTADDR: + error = in_gre_ioctl(sc, cmd, data); + break; +#endif #ifdef INET6 + case SIOCSIFPHYADDR_IN6: case SIOCGIFPSRCADDR_IN6: case SIOCGIFPDSTADDR_IN6: -#endif - if (sc->gre_family == 0) { - error = EADDRNOTAVAIL; - break; - } - GRE_RLOCK(sc); - switch (cmd) { -#ifdef INET - case SIOCGIFPSRCADDR: - case SIOCGIFPDSTADDR: - if (sc->gre_family != AF_INET) { - error = EADDRNOTAVAIL; - break; - } - sin = (struct sockaddr_in *)&ifr->ifr_addr; - memset(sin, 0, sizeof(*sin)); - sin->sin_family = AF_INET; - sin->sin_len = sizeof(*sin); - break; -#endif -#ifdef INET6 - case SIOCGIFPSRCADDR_IN6: - case SIOCGIFPDSTADDR_IN6: - if (sc->gre_family != AF_INET6) { - error = EADDRNOTAVAIL; - break; - } - sin6 = (struct sockaddr_in6 *) - &(((struct in6_ifreq *)data)->ifr_addr); - memset(sin6, 0, sizeof(*sin6)); - sin6->sin6_family = AF_INET6; - sin6->sin6_len = sizeof(*sin6); - break; -#endif - } - if (error == 0) { - switch (cmd) { -#ifdef INET - case SIOCGIFPSRCADDR: - sin->sin_addr = sc->gre_oip.ip_src; - break; - case SIOCGIFPDSTADDR: - sin->sin_addr = sc->gre_oip.ip_dst; - break; -#endif -#ifdef INET6 - case SIOCGIFPSRCADDR_IN6: - sin6->sin6_addr = sc->gre_oip6.ip6_src; - break; - case SIOCGIFPDSTADDR_IN6: - sin6->sin6_addr = sc->gre_oip6.ip6_dst; - break; -#endif - } - } - GRE_RUNLOCK(sc); - if (error != 0) - break; - switch (cmd) { -#ifdef INET - case SIOCGIFPSRCADDR: - case SIOCGIFPDSTADDR: - error = prison_if(curthread->td_ucred, - (struct sockaddr *)sin); - if (error != 0) - memset(sin, 0, sizeof(*sin)); - break; -#endif -#ifdef INET6 - case SIOCGIFPSRCADDR_IN6: - case SIOCGIFPDSTADDR_IN6: - error = prison_if(curthread->td_ucred, - (struct sockaddr *)sin6); - if (error == 0) - error = sa6_recoverscope(sin6); - if (error != 0) - memset(sin6, 0, sizeof(*sin6)); -#endif - } + error = in6_gre_ioctl(sc, cmd, data); break; +#endif case SIOCGTUNFIB: ifr->ifr_fib = sc->gre_fibnum; break; @@ -459,40 +271,50 @@ gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) sc->gre_fibnum = ifr->ifr_fib; break; case GRESKEY: + case GRESOPTS: if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) break; if ((error = copyin(ifr_data_get_ptr(ifr), &opt, sizeof(opt))) != 0) break; - if (sc->gre_key != opt) { - GRE_WLOCK(sc); - sc->gre_key = opt; - gre_updatehdr(sc); - GRE_WUNLOCK(sc); + if (cmd == GRESKEY) { + if (sc->gre_key == opt) + break; + } else if (cmd == GRESOPTS) { + if (opt & ~GRE_OPTMASK) { + error = EINVAL; + break; + } + if (sc->gre_options == opt) + break; } - break; - case GREGKEY: - error = copyout(&sc->gre_key, ifr_data_get_ptr(ifr), - sizeof(sc->gre_key)); - break; - case GRESOPTS: - if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) + switch (sc->gre_family) { +#ifdef INET + case AF_INET: + in_gre_setopts(sc, cmd, opt); break; - if ((error = copyin(ifr_data_get_ptr(ifr), &opt, - sizeof(opt))) != 0) +#endif +#ifdef INET6 + case AF_INET6: + in6_gre_setopts(sc, cmd, opt); break; - if (opt & ~GRE_OPTMASK) - error = EINVAL; - else { - if (sc->gre_options != opt) { - GRE_WLOCK(sc); +#endif + default: + if (cmd == GRESKEY) + sc->gre_key = opt; + else sc->gre_options = opt; - gre_updatehdr(sc); - GRE_WUNLOCK(sc); - } + break; } + /* + * XXX: Do we need to initiate change of interface + * state here? + */ + break; + case GREGKEY: + error = copyout(&sc->gre_key, ifr_data_get_ptr(ifr), + sizeof(sc->gre_key)); break; - case GREGOPTS: error = copyout(&sc->gre_options, ifr_data_get_ptr(ifr), sizeof(sc->gre_options)); @@ -501,40 +323,68 @@ gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) error = EINVAL; break; } + if (error == 0 && sc->gre_family != 0) { + if ( +#ifdef INET + cmd == SIOCSIFPHYADDR || +#endif +#ifdef INET6 + cmd == SIOCSIFPHYADDR_IN6 || +#endif + 0) { + ifp->if_drv_flags |= IFF_DRV_RUNNING; + if_link_state_change(ifp, LINK_STATE_UP); + } + } end: sx_xunlock(&gre_ioctl_sx); return (error); } static void -gre_updatehdr(struct gre_softc *sc) +gre_delete_tunnel(struct gre_softc *sc) +{ + + sx_assert(&gre_ioctl_sx, SA_XLOCKED); + if (sc->gre_family != 0) { + CK_LIST_REMOVE(sc, chain); + GRE_WAIT(); + free(sc->gre_hdr, M_GRE); + sc->gre_family = 0; + } + GRE2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; + if_link_state_change(GRE2IFP(sc), LINK_STATE_DOWN); +} + +struct gre_list * +gre_hashinit(void) +{ + struct gre_list *hash; + int i; + + hash = malloc(sizeof(struct gre_list) * GRE_HASH_SIZE, + M_GRE, M_WAITOK); + for (i = 0; i < GRE_HASH_SIZE; i++) + CK_LIST_INIT(&hash[i]); + + return (hash); +} + +void +gre_hashdestroy(struct gre_list *hash) +{ + + free(hash, M_GRE); +} + +void +gre_updatehdr(struct gre_softc *sc, struct grehdr *gh) { - struct grehdr *gh = NULL; uint32_t *opts; uint16_t flags; - GRE_WLOCK_ASSERT(sc); - switch (sc->gre_family) { -#ifdef INET - case AF_INET: - sc->gre_hlen = sizeof(struct greip); - sc->gre_oip.ip_v = IPPROTO_IPV4; - sc->gre_oip.ip_hl = sizeof(struct ip) >> 2; - sc->gre_oip.ip_p = IPPROTO_GRE; - gh = &sc->gre_gihdr->gi_gre; - break; -#endif -#ifdef INET6 - case AF_INET6: - sc->gre_hlen = sizeof(struct greip6); - sc->gre_oip6.ip6_vfc = IPV6_VERSION; - sc->gre_oip6.ip6_nxt = IPPROTO_GRE; - gh = &sc->gre_gi6hdr->gi6_gre; - break; -#endif - default: - return; - } + sx_assert(&gre_ioctl_sx, SA_XLOCKED); + flags = 0; opts = gh->gre_opts; if (sc->gre_options & GRE_ENABLE_CSUM) { @@ -556,136 +406,12 @@ gre_updatehdr(struct gre_softc *sc) gh->gre_flags = htons(flags); } -static void -gre_detach(struct gre_softc *sc) -{ - - sx_assert(&gre_ioctl_sx, SA_XLOCKED); - if (sc->gre_ecookie != NULL) - encap_detach(sc->gre_ecookie); - sc->gre_ecookie = NULL; -} - -static int -gre_set_tunnel(struct ifnet *ifp, struct sockaddr *src, - struct sockaddr *dst) -{ - struct gre_softc *sc, *tsc; -#ifdef INET6 - struct ip6_hdr *ip6; -#endif -#ifdef INET - struct ip *ip; -#endif - void *hdr; - int error; - - sx_assert(&gre_ioctl_sx, SA_XLOCKED); - GRE_LIST_LOCK(); - sc = ifp->if_softc; - LIST_FOREACH(tsc, &V_gre_softc_list, gre_list) { - if (tsc == sc || tsc->gre_family != src->sa_family) - continue; -#ifdef INET - if (tsc->gre_family == AF_INET && - tsc->gre_oip.ip_src.s_addr == - satosin(src)->sin_addr.s_addr && - tsc->gre_oip.ip_dst.s_addr == - satosin(dst)->sin_addr.s_addr) { - GRE_LIST_UNLOCK(); - return (EADDRNOTAVAIL); - } -#endif -#ifdef INET6 - if (tsc->gre_family == AF_INET6 && - IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_src, - &satosin6(src)->sin6_addr) && - IN6_ARE_ADDR_EQUAL(&tsc->gre_oip6.ip6_dst, - &satosin6(dst)->sin6_addr)) { - GRE_LIST_UNLOCK(); - return (EADDRNOTAVAIL); - } -#endif - } - GRE_LIST_UNLOCK(); - - switch (src->sa_family) { -#ifdef INET - case AF_INET: - hdr = ip = malloc(sizeof(struct greip) + - 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO); - ip->ip_src = satosin(src)->sin_addr; - ip->ip_dst = satosin(dst)->sin_addr; - break; -#endif -#ifdef INET6 - case AF_INET6: - hdr = ip6 = malloc(sizeof(struct greip6) + - 3 * sizeof(uint32_t), M_GRE, M_WAITOK | M_ZERO); - ip6->ip6_src = satosin6(src)->sin6_addr; - ip6->ip6_dst = satosin6(dst)->sin6_addr; - break; -#endif - default: - return (EAFNOSUPPORT); - } - if (sc->gre_family != 0) - gre_detach(sc); - GRE_WLOCK(sc); - if (sc->gre_family != 0) - free(sc->gre_hdr, M_GRE); - sc->gre_family = src->sa_family; - sc->gre_hdr = hdr; - sc->gre_oseq = 0; - sc->gre_iseq = UINT32_MAX; - gre_updatehdr(sc); - GRE_WUNLOCK(sc); - - error = 0; - switch (src->sa_family) { -#ifdef INET - case AF_INET: - error = in_gre_attach(sc); - break; -#endif -#ifdef INET6 - case AF_INET6: - error = in6_gre_attach(sc); - break; -#endif - } - if (error == 0) { - ifp->if_drv_flags |= IFF_DRV_RUNNING; - if_link_state_change(ifp, LINK_STATE_UP); - } - return (error); -} - -static void -gre_delete_tunnel(struct ifnet *ifp) -{ - struct gre_softc *sc = ifp->if_softc; - int family; - - GRE_WLOCK(sc); - family = sc->gre_family; - sc->gre_family = 0; - GRE_WUNLOCK(sc); - if (family != 0) { - gre_detach(sc); - free(sc->gre_hdr, M_GRE); - } - ifp->if_drv_flags &= ~IFF_DRV_RUNNING; - if_link_state_change(ifp, LINK_STATE_DOWN); -} - int -gre_input(struct mbuf **mp, int *offp, int proto) +gre_input(struct mbuf *m, int off, int proto, void *arg) { - struct gre_softc *sc; + struct gre_softc *sc = arg; struct grehdr *gh; struct ifnet *ifp; - struct mbuf *m; uint32_t *opts; #ifdef notyet uint32_t key; @@ -693,12 +419,8 @@ gre_input(struct mbuf **mp, int *offp, int proto) uint16_t flags; int hlen, isr, af; - m = *mp; - sc = encap_getarg(m); - KASSERT(sc != NULL, ("encap_getarg returned NULL")); - ifp = GRE2IFP(sc); - hlen = *offp + sizeof(struct grehdr) + 4 * sizeof(uint32_t); + hlen = off + sizeof(struct grehdr) + 4 * sizeof(uint32_t); if (m->m_pkthdr.len < hlen) goto drop; if (m->m_len < hlen) { @@ -706,7 +428,7 @@ gre_input(struct mbuf **mp, int *offp, int proto) if (m == NULL) goto drop; } - gh = (struct grehdr *)mtodo(m, *offp); + gh = (struct grehdr *)mtodo(m, off); flags = ntohs(gh->gre_flags); if (flags & ~GRE_FLAGS_MASK) goto drop; @@ -716,7 +438,7 @@ gre_input(struct mbuf **mp, int *offp, int proto) /* reserved1 field must be zero */ if (((uint16_t *)opts)[1] != 0) goto drop; - if (in_cksum_skip(m, m->m_pkthdr.len, *offp) != 0) + if (in_cksum_skip(m, m->m_pkthdr.len, off) != 0) goto drop; hlen += 2 * sizeof(uint16_t); opts++; @@ -766,7 +488,7 @@ gre_input(struct mbuf **mp, int *offp, int proto) default: goto drop; } - m_adj(m, *offp + hlen); + m_adj(m, off + hlen); m_clrprotoflags(m); m->m_pkthdr.rcvif = ifp; M_SETFIB(m, ifp->if_fib); @@ -787,70 +509,23 @@ drop: return (IPPROTO_DONE); } -#define MTAG_GRE 1307983903 -static int -gre_check_nesting(struct ifnet *ifp, struct mbuf *m) -{ - struct m_tag *mtag; - int count; - - count = 1; - mtag = NULL; - while ((mtag = m_tag_locate(m, MTAG_GRE, 0, mtag)) != NULL) { - if (*(struct ifnet **)(mtag + 1) == ifp) { - log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname); - return (EIO); - } - count++; - } - if (count > V_max_gre_nesting) { - log(LOG_NOTICE, - "%s: if_output recursively called too many times(%d)\n", - ifp->if_xname, count); - return (EIO); - } - mtag = m_tag_alloc(MTAG_GRE, 0, sizeof(struct ifnet *), M_NOWAIT); - if (mtag == NULL) - return (ENOMEM); - *(struct ifnet **)(mtag + 1) = ifp; - m_tag_prepend(m, mtag); - return (0); -} - static int gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, struct route *ro) { uint32_t af; - int error; -#ifdef MAC - error = mac_ifnet_check_transmit(ifp, m); - if (error != 0) - goto drop; -#endif - if ((ifp->if_flags & IFF_MONITOR) != 0 || - (ifp->if_flags & IFF_UP) == 0) { - error = ENETDOWN; - goto drop; - } - - error = gre_check_nesting(ifp, m); - if (error != 0) - goto drop; - - m->m_flags &= ~(M_BCAST|M_MCAST); if (dst->sa_family == AF_UNSPEC) bcopy(dst->sa_data, &af, sizeof(af)); else af = dst->sa_family; - BPF_MTAP2(ifp, &af, sizeof(af), m); - m->m_pkthdr.csum_data = af; /* save af for if_transmit */ + /* + * Now save the af in the inbound pkt csum data, this is a cheat since + * we are using the inbound csum_data field to carry the af over to + * the gre_transmit() routine, avoiding using yet another mtag. + */ + m->m_pkthdr.csum_data = af; return (ifp->if_transmit(ifp, m)); -drop: - m_freem(m); - if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); - return (error); } static void @@ -870,95 +545,95 @@ gre_setseqn(struct grehdr *gh, uint32_t seq) *opts = htonl(seq); } +#define MTAG_GRE 1307983903 static int gre_transmit(struct ifnet *ifp, struct mbuf *m) { - GRE_RLOCK_TRACKER; struct gre_softc *sc; struct grehdr *gh; - uint32_t iaf, oaf, oseq; - int error, hlen, olen, plen; - int want_seq, want_csum; + uint32_t af; + int error, len; + uint16_t proto; - plen = 0; - sc = ifp->if_softc; - if (sc == NULL) { - error = ENETDOWN; + len = 0; +#ifdef MAC + error = mac_ifnet_check_transmit(ifp, m); + if (error) { m_freem(m); goto drop; } - GRE_RLOCK(sc); - if (sc->gre_family == 0) { - GRE_RUNLOCK(sc); - error = ENETDOWN; +#endif + error = ENETDOWN; + GRE_RLOCK(); + sc = ifp->if_softc; + if ((ifp->if_flags & IFF_MONITOR) != 0 || + (ifp->if_flags & IFF_UP) == 0 || + sc->gre_family == 0 || + (error = if_tunnel_check_nesting(ifp, m, MTAG_GRE, + V_max_gre_nesting)) != 0) { m_freem(m); goto drop; } - iaf = m->m_pkthdr.csum_data; - oaf = sc->gre_family; - hlen = sc->gre_hlen; - want_seq = (sc->gre_options & GRE_ENABLE_SEQ) != 0; - if (want_seq) - oseq = sc->gre_oseq++; /* XXX */ - else - oseq = 0; /* Make compiler happy. */ - want_csum = (sc->gre_options & GRE_ENABLE_CSUM) != 0; + af = m->m_pkthdr.csum_data; M_SETFIB(m, sc->gre_fibnum); - M_PREPEND(m, hlen, M_NOWAIT); + M_PREPEND(m, sc->gre_hlen, M_NOWAIT); if (m == NULL) { - GRE_RUNLOCK(sc); error = ENOBUFS; goto drop; } - bcopy(sc->gre_hdr, mtod(m, void *), hlen); - GRE_RUNLOCK(sc); - switch (oaf) { + bcopy(sc->gre_hdr, mtod(m, void *), sc->gre_hlen); + /* Determine GRE proto */ + switch (af) { #ifdef INET case AF_INET: - olen = sizeof(struct ip); + proto = htons(ETHERTYPE_IP); break; #endif #ifdef INET6 case AF_INET6: - olen = sizeof(struct ip6_hdr); + proto = htons(ETHERTYPE_IPV6); break; #endif default: + m_freem(m); error = ENETDOWN; goto drop; } - gh = (struct grehdr *)mtodo(m, olen); - switch (iaf) { + /* Determine offset of GRE header */ + switch (sc->gre_family) { #ifdef INET case AF_INET: - gh->gre_proto = htons(ETHERTYPE_IP); + len = sizeof(struct ip); break; #endif #ifdef INET6 case AF_INET6: - gh->gre_proto = htons(ETHERTYPE_IPV6); + len = sizeof(struct ip6_hdr); break; #endif default: + m_freem(m); error = ENETDOWN; goto drop; } - if (want_seq) - gre_setseqn(gh, oseq); - if (want_csum) { + gh = (struct grehdr *)mtodo(m, len); + gh->gre_proto = proto; + if (sc->gre_options & GRE_ENABLE_SEQ) + gre_setseqn(gh, sc->gre_oseq++); + if (sc->gre_options & GRE_ENABLE_CSUM) { *(uint16_t *)gh->gre_opts = in_cksum_skip(m, - m->m_pkthdr.len, olen); + m->m_pkthdr.len, len); } - plen = m->m_pkthdr.len - hlen; - switch (oaf) { + len = m->m_pkthdr.len - len; + switch (sc->gre_family) { #ifdef INET case AF_INET: - error = in_gre_output(m, iaf, hlen); + error = in_gre_output(m, af, sc->gre_hlen); break; #endif #ifdef INET6 case AF_INET6: - error = in6_gre_output(m, iaf, hlen); + error = in6_gre_output(m, af, sc->gre_hlen); break; #endif default: @@ -970,8 +645,9 @@ drop: if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); else { if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); - if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); + if_inc_counter(ifp, IFCOUNTER_OBYTES, len); } + GRE_RUNLOCK(); return (error); } -- cgit v1.2.3