diff options
Diffstat (limited to 'freebsd/sys/net/if_enc.c')
-rw-r--r-- | freebsd/sys/net/if_enc.c | 458 |
1 files changed, 252 insertions, 206 deletions
diff --git a/freebsd/sys/net/if_enc.c b/freebsd/sys/net/if_enc.c index 91d34722..d0d065b8 100644 --- a/freebsd/sys/net/if_enc.c +++ b/freebsd/sys/net/if_enc.c @@ -2,6 +2,7 @@ /*- * Copyright (c) 2006 The FreeBSD Project. + * Copyright (c) 2015 Andrey V. Elsukov <ae@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -31,10 +32,10 @@ #include <rtems/bsd/local/opt_inet.h> #include <rtems/bsd/local/opt_inet6.h> -#include <rtems/bsd/local/opt_enc.h> #include <rtems/bsd/sys/param.h> #include <sys/systm.h> +#include <sys/hhook.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mbuf.h> @@ -46,6 +47,8 @@ #include <sys/sysctl.h> #include <net/if.h> +#include <net/if_enc.h> +#include <net/if_var.h> #include <net/if_clone.h> #include <net/if_types.h> #include <net/pfil.h> @@ -80,56 +83,66 @@ struct enchdr { u_int32_t spi; u_int32_t flags; }; - -struct ifnet *encif; -static struct mtx enc_mtx; - struct enc_softc { struct ifnet *sc_ifp; }; +static VNET_DEFINE(struct enc_softc *, enc_sc); +#define V_enc_sc VNET(enc_sc) +static VNET_DEFINE(struct if_clone *, enc_cloner); +#define V_enc_cloner VNET(enc_cloner) static int enc_ioctl(struct ifnet *, u_long, caddr_t); -static int enc_output(struct ifnet *ifp, struct mbuf *m, - struct sockaddr *dst, struct route *ro); +static int enc_output(struct ifnet *, struct mbuf *, + const struct sockaddr *, struct route *); static int enc_clone_create(struct if_clone *, int, caddr_t); static void enc_clone_destroy(struct ifnet *); +static int enc_add_hhooks(struct enc_softc *); +static void enc_remove_hhooks(struct enc_softc *); -IFC_SIMPLE_DECLARE(enc, 1); - -/* - * Sysctls. - */ +static const char encname[] = "enc"; /* * Before and after are relative to when we are stripping the * outer IP header. */ -static SYSCTL_NODE(_net, OID_AUTO, enc, CTLFLAG_RW, 0, "enc sysctl"); +static VNET_DEFINE(int, filter_mask_in) = IPSEC_ENC_BEFORE; +static VNET_DEFINE(int, bpf_mask_in) = IPSEC_ENC_BEFORE; +static VNET_DEFINE(int, filter_mask_out) = IPSEC_ENC_BEFORE; +static VNET_DEFINE(int, bpf_mask_out) = IPSEC_ENC_BEFORE | IPSEC_ENC_AFTER; +#define V_filter_mask_in VNET(filter_mask_in) +#define V_bpf_mask_in VNET(bpf_mask_in) +#define V_filter_mask_out VNET(filter_mask_out) +#define V_bpf_mask_out VNET(bpf_mask_out) +static SYSCTL_NODE(_net, OID_AUTO, enc, CTLFLAG_RW, 0, "enc sysctl"); static SYSCTL_NODE(_net_enc, OID_AUTO, in, CTLFLAG_RW, 0, "enc input sysctl"); -static int ipsec_filter_mask_in = ENC_BEFORE; -SYSCTL_INT(_net_enc_in, OID_AUTO, ipsec_filter_mask, CTLFLAG_RW, - &ipsec_filter_mask_in, 0, "IPsec input firewall filter mask"); -static int ipsec_bpf_mask_in = ENC_BEFORE; -SYSCTL_INT(_net_enc_in, OID_AUTO, ipsec_bpf_mask, CTLFLAG_RW, - &ipsec_bpf_mask_in, 0, "IPsec input bpf mask"); - static SYSCTL_NODE(_net_enc, OID_AUTO, out, CTLFLAG_RW, 0, "enc output sysctl"); -static int ipsec_filter_mask_out = ENC_BEFORE; -SYSCTL_INT(_net_enc_out, OID_AUTO, ipsec_filter_mask, CTLFLAG_RW, - &ipsec_filter_mask_out, 0, "IPsec output firewall filter mask"); -static int ipsec_bpf_mask_out = ENC_BEFORE|ENC_AFTER; -SYSCTL_INT(_net_enc_out, OID_AUTO, ipsec_bpf_mask, CTLFLAG_RW, - &ipsec_bpf_mask_out, 0, "IPsec output bpf mask"); +SYSCTL_INT(_net_enc_in, OID_AUTO, ipsec_filter_mask, + CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(filter_mask_in), 0, + "IPsec input firewall filter mask"); +SYSCTL_INT(_net_enc_in, OID_AUTO, ipsec_bpf_mask, + CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(bpf_mask_in), 0, + "IPsec input bpf mask"); +SYSCTL_INT(_net_enc_out, OID_AUTO, ipsec_filter_mask, + CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(filter_mask_out), 0, + "IPsec output firewall filter mask"); +SYSCTL_INT(_net_enc_out, OID_AUTO, ipsec_bpf_mask, + CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(bpf_mask_out), 0, + "IPsec output bpf mask"); static void enc_clone_destroy(struct ifnet *ifp) { - KASSERT(ifp != encif, ("%s: destroying encif", __func__)); + struct enc_softc *sc; + + sc = ifp->if_softc; + KASSERT(sc == V_enc_sc, ("sc != ifp->if_softc")); bpfdetach(ifp); if_detach(ifp); if_free(ifp); + free(sc, M_DEVBUF); + V_enc_sc = NULL; } static int @@ -138,244 +151,277 @@ enc_clone_create(struct if_clone *ifc, int unit, caddr_t params) struct ifnet *ifp; struct enc_softc *sc; - sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); + sc = malloc(sizeof(struct enc_softc), M_DEVBUF, + M_WAITOK | M_ZERO); ifp = sc->sc_ifp = if_alloc(IFT_ENC); if (ifp == NULL) { free(sc, M_DEVBUF); return (ENOSPC); } - - if_initname(ifp, ifc->ifc_name, unit); + if (V_enc_sc != NULL) { + if_free(ifp); + free(sc, M_DEVBUF); + return (EEXIST); + } + V_enc_sc = sc; + if_initname(ifp, encname, unit); ifp->if_mtu = ENCMTU; ifp->if_ioctl = enc_ioctl; ifp->if_output = enc_output; - ifp->if_snd.ifq_maxlen = ifqmaxlen; ifp->if_softc = sc; if_attach(ifp); bpfattach(ifp, DLT_ENC, sizeof(struct enchdr)); - - mtx_lock(&enc_mtx); - /* grab a pointer to enc0, ignore the rest */ - if (encif == NULL) - encif = ifp; - mtx_unlock(&enc_mtx); - return (0); } static int -enc_modevent(module_t mod, int type, void *data) +enc_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, + struct route *ro) { - switch (type) { - case MOD_LOAD: - mtx_init(&enc_mtx, "enc mtx", NULL, MTX_DEF); - if_clone_attach(&enc_cloner); - break; - case MOD_UNLOAD: - printf("enc module unload - not possible for this module\n"); - return (EINVAL); - default: - return (EOPNOTSUPP); - } + + m_freem(m); return (0); } -static moduledata_t enc_mod = { - "if_enc", - enc_modevent, - 0 -}; - -DECLARE_MODULE(if_enc, enc_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY); - static int -enc_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, - struct route *ro) +enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { - m_freem(m); + + if (cmd != SIOCSIFFLAGS) + return (EINVAL); + if (ifp->if_flags & IFF_UP) + ifp->if_drv_flags |= IFF_DRV_RUNNING; + else + ifp->if_drv_flags &= ~IFF_DRV_RUNNING; return (0); } /* - * Process an ioctl request. + * One helper hook function is used by any hook points. + * + from hhook_type we can determine the packet direction: + * HHOOK_TYPE_IPSEC_IN or HHOOK_TYPE_IPSEC_OUT; + * + from hhook_id we can determine address family: AF_INET or AF_INET6; + * + udata contains pointer to enc_softc; + * + ctx_data contains pointer to struct ipsec_ctx_data. */ -/* ARGSUSED */ static int -enc_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) +enc_hhook(int32_t hhook_type, int32_t hhook_id, void *udata, void *ctx_data, + void *hdata, struct osd *hosd) { - int error = 0; - - mtx_lock(&enc_mtx); + struct enchdr hdr; + struct ipsec_ctx_data *ctx; + struct enc_softc *sc; + struct ifnet *ifp, *rcvif; + struct pfil_head *ph; + int pdir; - switch (cmd) { + sc = (struct enc_softc *)udata; + ifp = sc->sc_ifp; + if ((ifp->if_flags & IFF_UP) == 0) + return (0); - case SIOCSIFFLAGS: - if (ifp->if_flags & IFF_UP) - ifp->if_drv_flags |= IFF_DRV_RUNNING; - else - ifp->if_drv_flags &= ~IFF_DRV_RUNNING; + ctx = (struct ipsec_ctx_data *)ctx_data; + /* XXX: wrong hook point was used by caller? */ + if (ctx->af != hhook_id) + return (EPFNOSUPPORT); + + if (((hhook_type == HHOOK_TYPE_IPSEC_IN && + (ctx->enc & V_bpf_mask_in) != 0) || + (hhook_type == HHOOK_TYPE_IPSEC_OUT && + (ctx->enc & V_bpf_mask_out) != 0)) && + bpf_peers_present(ifp->if_bpf) != 0) { + hdr.af = ctx->af; + hdr.spi = ctx->sav->spi; + hdr.flags = 0; + if (ctx->sav->alg_enc != SADB_EALG_NONE) + hdr.flags |= M_CONF; + if (ctx->sav->alg_auth != SADB_AALG_NONE) + hdr.flags |= M_AUTH; + bpf_mtap2(ifp->if_bpf, &hdr, sizeof(hdr), *ctx->mp); + } + switch (hhook_type) { + case HHOOK_TYPE_IPSEC_IN: + if (ctx->enc == IPSEC_ENC_BEFORE) { + /* Do accounting only once */ + if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); + if_inc_counter(ifp, IFCOUNTER_IBYTES, + (*ctx->mp)->m_pkthdr.len); + } + if ((ctx->enc & V_filter_mask_in) == 0) + return (0); /* skip pfil processing */ + pdir = PFIL_IN; + break; + case HHOOK_TYPE_IPSEC_OUT: + if (ctx->enc == IPSEC_ENC_BEFORE) { + /* Do accounting only once */ + if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); + if_inc_counter(ifp, IFCOUNTER_OBYTES, + (*ctx->mp)->m_pkthdr.len); + } + if ((ctx->enc & V_filter_mask_out) == 0) + return (0); /* skip pfil processing */ + pdir = PFIL_OUT; break; - default: - error = EINVAL; + return (EINVAL); } - mtx_unlock(&enc_mtx); - return (error); + switch (hhook_id) { +#ifdef INET + case AF_INET: + ph = &V_inet_pfil_hook; + break; +#endif +#ifdef INET6 + case AF_INET6: + ph = &V_inet6_pfil_hook; + break; +#endif + default: + ph = NULL; + } + if (ph == NULL || !PFIL_HOOKED(ph)) + return (0); + /* Make a packet looks like it was received on enc(4) */ + rcvif = (*ctx->mp)->m_pkthdr.rcvif; + (*ctx->mp)->m_pkthdr.rcvif = ifp; + if (pfil_run_hooks(ph, ctx->mp, ifp, pdir, NULL) != 0 || + *ctx->mp == NULL) { + *ctx->mp = NULL; /* consumed by filter */ + return (EACCES); + } + (*ctx->mp)->m_pkthdr.rcvif = rcvif; + return (0); } -int -ipsec_filter(struct mbuf **mp, int dir, int flags) +static int +enc_add_hhooks(struct enc_softc *sc) { - int error, i; - struct ip *ip; - - KASSERT(encif != NULL, ("%s: encif is null", __func__)); - KASSERT(flags & (ENC_IN|ENC_OUT), - ("%s: invalid flags: %04x", __func__, flags)); - - if ((encif->if_drv_flags & IFF_DRV_RUNNING) == 0) - return (0); + struct hookinfo hki; + int error; - if (flags & ENC_IN) { - if ((flags & ipsec_filter_mask_in) == 0) - return (0); - } else { - if ((flags & ipsec_filter_mask_out) == 0) - return (0); - } - - /* Skip pfil(9) if no filters are loaded */ - if (1 + error = EPFNOSUPPORT; + hki.hook_func = enc_hhook; + hki.hook_helper = NULL; + hki.hook_udata = sc; #ifdef INET - && !PFIL_HOOKED(&V_inet_pfil_hook) + hki.hook_id = AF_INET; + hki.hook_type = HHOOK_TYPE_IPSEC_IN; + error = hhook_add_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET], + &hki, HHOOK_WAITOK); + if (error != 0) + return (error); + hki.hook_type = HHOOK_TYPE_IPSEC_OUT; + error = hhook_add_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET], + &hki, HHOOK_WAITOK); + if (error != 0) + return (error); #endif #ifdef INET6 - && !PFIL_HOOKED(&V_inet6_pfil_hook) + hki.hook_id = AF_INET6; + hki.hook_type = HHOOK_TYPE_IPSEC_IN; + error = hhook_add_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET6], + &hki, HHOOK_WAITOK); + if (error != 0) + return (error); + hki.hook_type = HHOOK_TYPE_IPSEC_OUT; + error = hhook_add_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET6], + &hki, HHOOK_WAITOK); + if (error != 0) + return (error); #endif - ) { - return (0); - } + return (error); +} - i = min((*mp)->m_pkthdr.len, max_protohdr); - if ((*mp)->m_len < i) { - *mp = m_pullup(*mp, i); - if (*mp == NULL) { - printf("%s: m_pullup failed\n", __func__); - return (-1); - } - } +static void +enc_remove_hhooks(struct enc_softc *sc) +{ + struct hookinfo hki; - error = 0; - ip = mtod(*mp, struct ip *); - switch (ip->ip_v) { + hki.hook_func = enc_hhook; + hki.hook_helper = NULL; + hki.hook_udata = sc; #ifdef INET - case 4: - /* - * before calling the firewall, swap fields the same as - * IP does. here we assume the header is contiguous - */ - ip->ip_len = ntohs(ip->ip_len); - ip->ip_off = ntohs(ip->ip_off); - - error = pfil_run_hooks(&V_inet_pfil_hook, mp, - encif, dir, NULL); - - if (*mp == NULL || error != 0) - break; - - /* restore byte ordering */ - ip = mtod(*mp, struct ip *); - ip->ip_len = htons(ip->ip_len); - ip->ip_off = htons(ip->ip_off); - break; + hki.hook_id = AF_INET; + hki.hook_type = HHOOK_TYPE_IPSEC_IN; + hhook_remove_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET], &hki); + hki.hook_type = HHOOK_TYPE_IPSEC_OUT; + hhook_remove_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET], &hki); #endif #ifdef INET6 - case 6: - error = pfil_run_hooks(&V_inet6_pfil_hook, mp, - encif, dir, NULL); - break; + hki.hook_id = AF_INET6; + hki.hook_type = HHOOK_TYPE_IPSEC_IN; + hhook_remove_hook(V_ipsec_hhh_in[HHOOK_IPSEC_INET6], &hki); + hki.hook_type = HHOOK_TYPE_IPSEC_OUT; + hhook_remove_hook(V_ipsec_hhh_out[HHOOK_IPSEC_INET6], &hki); #endif - default: - printf("%s: unknown IP version\n", __func__); - } +} - /* - * If the mbuf was consumed by the filter for requeueing (dummynet, etc) - * then error will be zero but we still want to return an error to our - * caller so the null mbuf isn't forwarded further. - */ - if (*mp == NULL && error == 0) - return (-1); /* Consumed by the filter */ - if (*mp == NULL) - return (error); - if (error != 0) - goto bad; +static void +vnet_enc_init(const void *unused __unused) +{ - return (error); + V_enc_sc = NULL; + V_enc_cloner = if_clone_simple(encname, enc_clone_create, + enc_clone_destroy, 1); +} +VNET_SYSINIT(vnet_enc_init, SI_SUB_PSEUDO, SI_ORDER_ANY, + vnet_enc_init, NULL); -bad: - m_freem(*mp); - *mp = NULL; - return (error); +static void +vnet_enc_init_proto(void *unused __unused) +{ + KASSERT(V_enc_sc != NULL, ("%s: V_enc_sc is %p\n", __func__, V_enc_sc)); + + if (enc_add_hhooks(V_enc_sc) != 0) + enc_clone_destroy(V_enc_sc->sc_ifp); } +VNET_SYSINIT(vnet_enc_init_proto, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, + vnet_enc_init_proto, NULL); -void -ipsec_bpf(struct mbuf *m, struct secasvar *sav, int af, int flags) +static void +vnet_enc_uninit(const void *unused __unused) { - int mflags; - struct enchdr hdr; + KASSERT(V_enc_sc != NULL, ("%s: V_enc_sc is %p\n", __func__, V_enc_sc)); - KASSERT(encif != NULL, ("%s: encif is null", __func__)); - KASSERT(flags & (ENC_IN|ENC_OUT), - ("%s: invalid flags: %04x", __func__, flags)); + if_clone_detach(V_enc_cloner); +} +VNET_SYSUNINIT(vnet_enc_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY, + vnet_enc_uninit, NULL); - if ((encif->if_drv_flags & IFF_DRV_RUNNING) == 0) - return; +/* + * The hhook consumer needs to go before ip[6]_destroy are called on + * SI_ORDER_THIRD. + */ +static void +vnet_enc_uninit_hhook(const void *unused __unused) +{ + KASSERT(V_enc_sc != NULL, ("%s: V_enc_sc is %p\n", __func__, V_enc_sc)); - if (flags & ENC_IN) { - if ((flags & ipsec_bpf_mask_in) == 0) - return; - } else { - if ((flags & ipsec_bpf_mask_out) == 0) - return; - } + enc_remove_hhooks(V_enc_sc); +} +VNET_SYSUNINIT(vnet_enc_uninit_hhook, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, + vnet_enc_uninit_hhook, NULL); - if (bpf_peers_present(encif->if_bpf)) { - mflags = 0; - hdr.spi = 0; - if (!sav) { - struct m_tag *mtag; - mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); - if (mtag != NULL) { - struct tdb_ident *tdbi; - tdbi = (struct tdb_ident *) (mtag + 1); - if (tdbi->alg_enc != SADB_EALG_NONE) - mflags |= M_CONF; - if (tdbi->alg_auth != SADB_AALG_NONE) - mflags |= M_AUTH; - hdr.spi = tdbi->spi; - } - } else { - if (sav->alg_enc != SADB_EALG_NONE) - mflags |= M_CONF; - if (sav->alg_auth != SADB_AALG_NONE) - mflags |= M_AUTH; - hdr.spi = sav->spi; - } +static int +enc_modevent(module_t mod, int type, void *data) +{ - /* - * We need to prepend the address family as a four byte - * field. Cons up a dummy header to pacify bpf. This - * is safe because bpf will only read from the mbuf - * (i.e., it won't try to free it or keep a pointer a - * to it). - */ - hdr.af = af; - /* hdr.spi already set above */ - hdr.flags = mflags; - - bpf_mtap2(encif->if_bpf, &hdr, sizeof(hdr), m); + switch (type) { + case MOD_LOAD: + case MOD_UNLOAD: + break; + default: + return (EOPNOTSUPP); } + return (0); } + +static moduledata_t enc_mod = { + "if_enc", + enc_modevent, + 0 +}; + +DECLARE_MODULE(if_enc, enc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); |