diff options
Diffstat (limited to 'sys/netipsec/xform_ipcomp.c')
-rw-r--r-- | sys/netipsec/xform_ipcomp.c | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/sys/netipsec/xform_ipcomp.c b/sys/netipsec/xform_ipcomp.c new file mode 100644 index 0000000..108d356 --- /dev/null +++ b/sys/netipsec/xform_ipcomp.c @@ -0,0 +1,608 @@ +/* $FreeBSD$ */ +/* $OpenBSD: ip_ipcomp.c,v 1.1 2001/07/05 12:08:52 jjbg Exp $ */ + +/* + * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org) + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* IP payload compression protocol (IPComp), see RFC 2393 */ +#include "opt_inet.h" +#include "opt_inet6.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/kernel.h> +#include <sys/protosw.h> +#include <sys/sysctl.h> + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <netinet/ip_var.h> + +#include <net/route.h> +#include <netipsec/ipsec.h> +#include <netipsec/xform.h> + +#ifdef INET6 +#include <netinet/ip6.h> +#include <netipsec/ipsec6.h> +#endif + +#include <netipsec/ipcomp.h> +#include <netipsec/ipcomp_var.h> + +#include <netipsec/key.h> +#include <netipsec/key_debug.h> + +#include <opencrypto/cryptodev.h> +#include <opencrypto/deflate.h> +#include <opencrypto/xform.h> + +int ipcomp_enable = 0; +struct ipcompstat ipcompstat; + +SYSCTL_DECL(_net_inet_ipcomp); +SYSCTL_INT(_net_inet_ipcomp, OID_AUTO, + ipcomp_enable, CTLFLAG_RW, &ipcomp_enable, 0, ""); +SYSCTL_STRUCT(_net_inet_ipcomp, IPSECCTL_STATS, + stats, CTLFLAG_RD, &ipcompstat, ipcompstat, ""); + +static int ipcomp_input_cb(struct cryptop *crp); +static int ipcomp_output_cb(struct cryptop *crp); + +struct comp_algo * +ipcomp_algorithm_lookup(int alg) +{ + if (alg >= IPCOMP_ALG_MAX) + return NULL; + switch (alg) { + case SADB_X_CALG_DEFLATE: + return &comp_algo_deflate; + } + return NULL; +} + +/* + * ipcomp_init() is called when an CPI is being set up. + */ +static int +ipcomp_init(struct secasvar *sav, struct xformsw *xsp) +{ + struct comp_algo *tcomp; + struct cryptoini cric; + + /* NB: algorithm really comes in alg_enc and not alg_comp! */ + tcomp = ipcomp_algorithm_lookup(sav->alg_enc); + if (tcomp == NULL) { + DPRINTF(("ipcomp_init: unsupported compression algorithm %d\n", + sav->alg_comp)); + return EINVAL; + } + sav->alg_comp = sav->alg_enc; /* set for doing histogram */ + sav->tdb_xform = xsp; + sav->tdb_compalgxform = tcomp; + + /* Initialize crypto session */ + bzero(&cric, sizeof (cric)); + cric.cri_alg = sav->tdb_compalgxform->type; + + return crypto_newsession(&sav->tdb_cryptoid, &cric, crypto_support); +} + +/* + * ipcomp_zeroize() used when IPCA is deleted + */ +static int +ipcomp_zeroize(struct secasvar *sav) +{ + int err; + + err = crypto_freesession(sav->tdb_cryptoid); + sav->tdb_cryptoid = 0; + return err; +} + +/* + * ipcomp_input() gets called to uncompress an input packet + */ +static int +ipcomp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) +{ + struct tdb_crypto *tc; + struct cryptodesc *crdc; + struct cryptop *crp; + int hlen = IPCOMP_HLENGTH; + +#if 0 + SPLASSERT(net, "ipcomp_input"); +#endif + + /* Get crypto descriptors */ + crp = crypto_getreq(1); + if (crp == NULL) { + m_freem(m); + DPRINTF(("ipcomp_input: no crypto descriptors\n")); + ipcompstat.ipcomps_crypto++; + return ENOBUFS; + } + /* Get IPsec-specific opaque pointer */ + tc = (struct tdb_crypto *) malloc(sizeof (*tc), M_XDATA, M_NOWAIT|M_ZERO); + if (tc == NULL) { + m_freem(m); + crypto_freereq(crp); + DPRINTF(("ipcomp_input: cannot allocate tdb_crypto\n")); + ipcompstat.ipcomps_crypto++; + return ENOBUFS; + } + crdc = crp->crp_desc; + + crdc->crd_skip = skip + hlen; + crdc->crd_len = m->m_pkthdr.len - (skip + hlen); + crdc->crd_inject = skip; + + tc->tc_ptr = 0; + + /* Decompression operation */ + crdc->crd_alg = sav->tdb_compalgxform->type; + + /* Crypto operation descriptor */ + crp->crp_ilen = m->m_pkthdr.len - (skip + hlen); + crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_NODELAY; + crp->crp_buf = (caddr_t) m; + crp->crp_callback = ipcomp_input_cb; + crp->crp_sid = sav->tdb_cryptoid; + crp->crp_opaque = (caddr_t) tc; + + /* These are passed as-is to the callback */ + tc->tc_spi = sav->spi; + tc->tc_dst = sav->sah->saidx.dst; + tc->tc_proto = sav->sah->saidx.proto; + tc->tc_protoff = protoff; + tc->tc_skip = skip; + + return crypto_dispatch(crp); +} + +#ifdef INET6 +#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) do { \ + if (saidx->dst.sa.sa_family == AF_INET6) { \ + error = ipsec6_common_input_cb(m, sav, skip, protoff, mtag); \ + } else { \ + error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag); \ + } \ +} while (0) +#else +#define IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, mtag) \ + (error = ipsec4_common_input_cb(m, sav, skip, protoff, mtag)) +#endif + +/* + * IPComp input callback from the crypto driver. + */ +static int +ipcomp_input_cb(struct cryptop *crp) +{ + struct cryptodesc *crd; + struct tdb_crypto *tc; + int skip, protoff; + struct mtag *mtag; + struct mbuf *m; + struct secasvar *sav; + struct secasindex *saidx; + int s, hlen = IPCOMP_HLENGTH, error, clen; + u_int8_t nproto; + caddr_t addr; + + crd = crp->crp_desc; + + tc = (struct tdb_crypto *) crp->crp_opaque; + KASSERT(tc != NULL, ("ipcomp_input_cb: null opaque crypto data area!")); + skip = tc->tc_skip; + protoff = tc->tc_protoff; + mtag = (struct mtag *) tc->tc_ptr; + m = (struct mbuf *) crp->crp_buf; + + s = splnet(); + + sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); + if (sav == NULL) { + ipcompstat.ipcomps_notdb++; + DPRINTF(("ipcomp_input_cb: SA expired while in crypto\n")); + error = ENOBUFS; /*XXX*/ + goto bad; + } + + saidx = &sav->sah->saidx; + KASSERT(saidx->dst.sa.sa_family == AF_INET || + saidx->dst.sa.sa_family == AF_INET6, + ("ah_input_cb: unexpected protocol family %u", + saidx->dst.sa.sa_family)); + + /* Check for crypto errors */ + if (crp->crp_etype) { + /* Reset the session ID */ + if (sav->tdb_cryptoid != 0) + sav->tdb_cryptoid = crp->crp_sid; + + if (crp->crp_etype == EAGAIN) { + KEY_FREESAV(&sav); + splx(s); + return crypto_dispatch(crp); + } + + ipcompstat.ipcomps_noxform++; + DPRINTF(("ipcomp_input_cb: crypto error %d\n", crp->crp_etype)); + error = crp->crp_etype; + goto bad; + } + /* Shouldn't happen... */ + if (m == NULL) { + ipcompstat.ipcomps_crypto++; + DPRINTF(("ipcomp_input_cb: null mbuf returned from crypto\n")); + error = EINVAL; + goto bad; + } + ipcompstat.ipcomps_hist[sav->alg_comp]++; + + clen = crp->crp_olen; /* Length of data after processing */ + + /* Release the crypto descriptors */ + free(tc, M_XDATA), tc = NULL; + crypto_freereq(crp), crp = NULL; + + /* In case it's not done already, adjust the size of the mbuf chain */ + m->m_pkthdr.len = clen + hlen + skip; + + if (m->m_len < skip + hlen && (m = m_pullup(m, skip + hlen)) == 0) { + ipcompstat.ipcomps_hdrops++; /*XXX*/ + DPRINTF(("ipcomp_input_cb: m_pullup failed\n")); + error = EINVAL; /*XXX*/ + goto bad; + } + + /* Keep the next protocol field */ + addr = (caddr_t) mtod(m, struct ip *) + skip; + nproto = ((struct ipcomp *) addr)->comp_nxt; + + /* Remove the IPCOMP header */ + error = m_striphdr(m, skip, hlen); + if (error) { + ipcompstat.ipcomps_hdrops++; + DPRINTF(("ipcomp_input_cb: bad mbuf chain, IPCA %s/%08lx\n", + ipsec_address(&sav->sah->saidx.dst), + (u_long) ntohl(sav->spi))); + goto bad; + } + + /* Restore the Next Protocol field */ + m_copyback(m, protoff, sizeof (u_int8_t), (u_int8_t *) &nproto); + + IPSEC_COMMON_INPUT_CB(m, sav, skip, protoff, NULL); + + KEY_FREESAV(&sav); + splx(s); + return error; +bad: + if (sav) + KEY_FREESAV(&sav); + splx(s); + if (m) + m_freem(m); + if (tc != NULL) + free(tc, M_XDATA); + if (crp) + crypto_freereq(crp); + return error; +} + +/* + * IPComp output routine, called by ipsec[46]_process_packet() + */ +static int +ipcomp_output( + struct mbuf *m, + struct ipsecrequest *isr, + struct mbuf **mp, + int skip, + int protoff +) +{ + struct secasvar *sav; + struct comp_algo *ipcompx; + int error, ralen, hlen, maxpacketsize, roff; + u_int8_t prot; + struct cryptodesc *crdc; + struct cryptop *crp; + struct tdb_crypto *tc; + struct mbuf *mo; + struct ipcomp *ipcomp; + +#if 0 + SPLASSERT(net, "ipcomp_output"); +#endif + + sav = isr->sav; + KASSERT(sav != NULL, ("ipcomp_output: null SA")); + ipcompx = sav->tdb_compalgxform; + KASSERT(ipcompx != NULL, ("ipcomp_output: null compression xform")); + + ralen = m->m_pkthdr.len - skip; /* Raw payload length before comp. */ + hlen = IPCOMP_HLENGTH; + + ipcompstat.ipcomps_output++; + + /* Check for maximum packet size violations. */ + switch (sav->sah->saidx.dst.sa.sa_family) { +#ifdef INET + case AF_INET: + maxpacketsize = IP_MAXPACKET; + break; +#endif /* INET */ +#ifdef INET6 + case AF_INET6: + maxpacketsize = IPV6_MAXPACKET; + break; +#endif /* INET6 */ + default: + ipcompstat.ipcomps_nopf++; + DPRINTF(("ipcomp_output: unknown/unsupported protocol family %d" + ", IPCA %s/%08lx\n", + sav->sah->saidx.dst.sa.sa_family, + ipsec_address(&sav->sah->saidx.dst), + (u_long) ntohl(sav->spi))); + error = EPFNOSUPPORT; + goto bad; + } + if (skip + hlen + ralen > maxpacketsize) { + ipcompstat.ipcomps_toobig++; + DPRINTF(("ipcomp_output: packet in IPCA %s/%08lx got too big " + "(len %u, max len %u)\n", + ipsec_address(&sav->sah->saidx.dst), + (u_long) ntohl(sav->spi), + skip + hlen + ralen, maxpacketsize)); + error = EMSGSIZE; + goto bad; + } + + /* Update the counters */ + ipcompstat.ipcomps_obytes += m->m_pkthdr.len - skip; + + m = m_clone(m); + if (m == NULL) { + ipcompstat.ipcomps_hdrops++; + DPRINTF(("ipcomp_output: cannot clone mbuf chain, IPCA %s/%08lx\n", + ipsec_address(&sav->sah->saidx.dst), + (u_long) ntohl(sav->spi))); + error = ENOBUFS; + goto bad; + } + + /* Inject IPCOMP header */ + mo = m_makespace(m, skip, hlen, &roff); + if (mo == NULL) { + ipcompstat.ipcomps_wrap++; + DPRINTF(("ipcomp_output: failed to inject IPCOMP header for " + "IPCA %s/%08lx\n", + ipsec_address(&sav->sah->saidx.dst), + (u_long) ntohl(sav->spi))); + error = ENOBUFS; + goto bad; + } + ipcomp = (struct ipcomp *)(mtod(mo, caddr_t) + roff); + + /* Initialize the IPCOMP header */ + /* XXX alignment always correct? */ + switch (sav->sah->saidx.dst.sa.sa_family) { +#ifdef INET + case AF_INET: + ipcomp->comp_nxt = mtod(m, struct ip *)->ip_p; + break; +#endif /* INET */ +#ifdef INET6 + case AF_INET6: + ipcomp->comp_nxt = mtod(m, struct ip6_hdr *)->ip6_nxt; + break; +#endif + } + ipcomp->comp_flags = 0; + ipcomp->comp_cpi = htons((u_int16_t) ntohl(sav->spi)); + + /* Fix Next Protocol in IPv4/IPv6 header */ + prot = IPPROTO_IPCOMP; + m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot); + + /* Ok now, we can pass to the crypto processing */ + + /* Get crypto descriptors */ + crp = crypto_getreq(1); + if (crp == NULL) { + ipcompstat.ipcomps_crypto++; + DPRINTF(("ipcomp_output: failed to acquire crypto descriptor\n")); + error = ENOBUFS; + goto bad; + } + crdc = crp->crp_desc; + + /* Compression descriptor */ + crdc->crd_skip = skip + hlen; + crdc->crd_len = m->m_pkthdr.len - (skip + hlen); + crdc->crd_flags = CRD_F_COMP; + crdc->crd_inject = skip + hlen; + + /* Compression operation */ + crdc->crd_alg = ipcompx->type; + + /* IPsec-specific opaque crypto info */ + tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), + M_XDATA, M_NOWAIT|M_ZERO); + if (tc == NULL) { + ipcompstat.ipcomps_crypto++; + DPRINTF(("ipcomp_output: failed to allocate tdb_crypto\n")); + crypto_freereq(crp); + error = ENOBUFS; + goto bad; + } + + tc->tc_isr = isr; + tc->tc_spi = sav->spi; + tc->tc_dst = sav->sah->saidx.dst; + tc->tc_proto = sav->sah->saidx.proto; + tc->tc_skip = skip + hlen; + + /* Crypto operation descriptor */ + crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ + crp->crp_flags = CRYPTO_F_IMBUF; + crp->crp_buf = (caddr_t) m; + crp->crp_callback = ipcomp_output_cb; + crp->crp_opaque = (caddr_t) tc; + crp->crp_sid = sav->tdb_cryptoid; + + return crypto_dispatch(crp); +bad: + if (m) + m_freem(m); + return (error); +} + +/* + * IPComp output callback from the crypto driver. + */ +static int +ipcomp_output_cb(struct cryptop *crp) +{ + struct tdb_crypto *tc; + struct ipsecrequest *isr; + struct secasvar *sav; + struct mbuf *m; + int s, error, skip, rlen; + + tc = (struct tdb_crypto *) crp->crp_opaque; + KASSERT(tc != NULL, ("ipcomp_output_cb: null opaque data area!")); + m = (struct mbuf *) crp->crp_buf; + skip = tc->tc_skip; + rlen = crp->crp_ilen - skip; + + s = splnet(); + + isr = tc->tc_isr; + sav = KEY_ALLOCSA(&tc->tc_dst, tc->tc_proto, tc->tc_spi); + if (sav == NULL) { + ipcompstat.ipcomps_notdb++; + DPRINTF(("ipcomp_output_cb: SA expired while in crypto\n")); + error = ENOBUFS; /*XXX*/ + goto bad; + } + KASSERT(isr->sav == sav, ("ipcomp_output_cb: SA changed\n")); + + /* Check for crypto errors */ + if (crp->crp_etype) { + /* Reset session ID */ + if (sav->tdb_cryptoid != 0) + sav->tdb_cryptoid = crp->crp_sid; + + if (crp->crp_etype == EAGAIN) { + KEY_FREESAV(&sav); + splx(s); + return crypto_dispatch(crp); + } + ipcompstat.ipcomps_noxform++; + DPRINTF(("ipcomp_output_cb: crypto error %d\n", crp->crp_etype)); + error = crp->crp_etype; + goto bad; + } + /* Shouldn't happen... */ + if (m == NULL) { + ipcompstat.ipcomps_crypto++; + DPRINTF(("ipcomp_output_cb: bogus return buffer from crypto\n")); + error = EINVAL; + goto bad; + } + ipcompstat.ipcomps_hist[sav->alg_comp]++; + + if (rlen > crp->crp_olen) { + /* Adjust the length in the IP header */ + switch (sav->sah->saidx.dst.sa.sa_family) { +#ifdef INET + case AF_INET: + mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); + break; +#endif /* INET */ +#ifdef INET6 + case AF_INET6: + mtod(m, struct ip6_hdr *)->ip6_plen = + htons(m->m_pkthdr.len) - sizeof(struct ip6_hdr); + break; +#endif /* INET6 */ + default: + ipcompstat.ipcomps_nopf++; + DPRINTF(("ipcomp_output: unknown/unsupported protocol " + "family %d, IPCA %s/%08lx\n", + sav->sah->saidx.dst.sa.sa_family, + ipsec_address(&sav->sah->saidx.dst), + (u_long) ntohl(sav->spi))); + error = EPFNOSUPPORT; + goto bad; + } + } else { + /* compression was useless, we have lost time */ + /* XXX add statistic */ + } + + /* Release the crypto descriptor */ + free(tc, M_XDATA); + crypto_freereq(crp); + + /* NB: m is reclaimed by ipsec_process_done. */ + error = ipsec_process_done(m, isr); + KEY_FREESAV(&sav); + splx(s); + return error; +bad: + if (sav) + KEY_FREESAV(&sav); + splx(s); + if (m) + m_freem(m); + free(tc, M_XDATA); + crypto_freereq(crp); + return error; +} + +static struct xformsw ipcomp_xformsw = { + XF_IPCOMP, XFT_COMP, "IPcomp", + ipcomp_init, ipcomp_zeroize, ipcomp_input, + ipcomp_output +}; + +static void +ipcomp_attach(void) +{ + xform_register(&ipcomp_xformsw); +} +SYSINIT(ipcomp_xform_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, ipcomp_attach, NULL) |