/* $NetBSD: ddp_input.c,v 1.33.4.1 2023/07/31 16:37:18 martin Exp $ */ /* * Copyright (c) 1990,1994 Regents of The University of Michigan. * All Rights Reserved. * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby granted, * provided that the above copyright notice appears in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation, and that the name of The University * of Michigan not be used in advertising or publicity pertaining to * distribution of the software without specific, written prior * permission. This software is supplied as is without expressed or * implied warranties of any kind. * * This product includes software developed by the University of * California, Berkeley and its contributors. * * Research Systems Unix Group * The University of Michigan * c/o Wesley Craig * 535 W. William Street * Ann Arbor, Michigan * +1-313-764-2278 * netatalk@umich.edu */ #include __KERNEL_RCSID(0, "$NetBSD: ddp_input.c,v 1.33.4.1 2023/07/31 16:37:18 martin Exp $"); #include "opt_atalk.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int ddp_forward = 1; int ddp_firewall = 0; extern int ddp_cksum; void ddp_input(struct mbuf *, struct ifnet *, struct elaphdr *, int); static struct at_ifaddr * at_ifaddr_for_ifp(struct ifnet * const ifp, int phase_flag) { struct at_ifaddr *aa; TAILQ_FOREACH(aa, &at_ifaddr, aa_list) { if (aa->aa_ifp == ifp && (aa->aa_flags & AFA_PHASE2) == phase_flag) { return aa; } } return NULL; } void atintr2(void *arg __unused) { struct mbuf *m; mutex_enter(softnet_lock); while ((m = pktq_dequeue(at_pktq2)) != NULL) { struct ifnet *ifp; m_claimm(m, &atalk_rx_mowner); ifp = m_get_rcvif_NOMPSAFE(m); if (at_ifaddr_for_ifp(ifp, AFA_PHASE2) == NULL) { /* ifp not an appletalk interface */ m_freem(m); continue; } ddp_input(m, ifp, NULL, 2); } mutex_exit(softnet_lock); } void atintr1(void *arg __unused) { struct mbuf *m; mutex_enter(softnet_lock); while ((m = pktq_dequeue(at_pktq1)) != NULL) { struct ifnet *ifp; struct elaphdr *elhp, elh; m_claimm(m, &atalk_rx_mowner); ifp = m_get_rcvif_NOMPSAFE(m); if (at_ifaddr_for_ifp(ifp, 0) == NULL) { /* ifp not an appletalk interface */ m_freem(m); continue; } if (m->m_len < SZ_ELAPHDR && ((m = m_pullup(m, SZ_ELAPHDR)) == 0)) { DDP_STATINC(DDP_STAT_TOOSHORT); continue; } elhp = mtod(m, struct elaphdr *); m_adj(m, SZ_ELAPHDR); if (elhp->el_type == ELAP_DDPEXTEND) { ddp_input(m, ifp, NULL, 1); } else { memcpy((void *) & elh, (void *) elhp, SZ_ELAPHDR); ddp_input(m, ifp, &elh, 1); } } mutex_exit(softnet_lock); } struct route forwro; void ddp_input(struct mbuf *m, struct ifnet *ifp, struct elaphdr *elh, int phase) { struct rtentry *rt; struct sockaddr_at from, to; struct ddpshdr *dsh, ddps; struct at_ifaddr *aa; struct ddpehdr *deh = NULL, ddpe; struct ddpcb *ddp; int dlen, mlen; u_short cksum = 0; union { struct sockaddr dst; struct sockaddr_at dsta; } u; memset((void *) & from, 0, sizeof(struct sockaddr_at)); if (elh) { DDP_STATINC(DDP_STAT_SHORT); if (m->m_len < sizeof(struct ddpshdr) && ((m = m_pullup(m, sizeof(struct ddpshdr))) == 0)) { DDP_STATINC(DDP_STAT_TOOSHORT); return; } dsh = mtod(m, struct ddpshdr *); memcpy((void *) & ddps, (void *) dsh, sizeof(struct ddpshdr)); ddps.dsh_bytes = ntohl(ddps.dsh_bytes); dlen = ddps.dsh_len; to.sat_addr.s_net = ATADDR_ANYNET; to.sat_addr.s_node = elh->el_dnode; to.sat_port = ddps.dsh_dport; from.sat_addr.s_net = ATADDR_ANYNET; from.sat_addr.s_node = elh->el_snode; from.sat_port = ddps.dsh_sport; TAILQ_FOREACH(aa, &at_ifaddr, aa_list) { if (aa->aa_ifp == ifp && (aa->aa_flags & AFA_PHASE2) == 0 && (AA_SAT(aa)->sat_addr.s_node == to.sat_addr.s_node || to.sat_addr.s_node == ATADDR_BCAST)) break; } if (aa == NULL) { m_freem(m); return; } } else { DDP_STATINC(DDP_STAT_LONG); if (m->m_len < sizeof(struct ddpehdr) && ((m = m_pullup(m, sizeof(struct ddpehdr))) == 0)) { DDP_STATINC(DDP_STAT_TOOSHORT); return; } deh = mtod(m, struct ddpehdr *); memcpy((void *) & ddpe, (void *) deh, sizeof(struct ddpehdr)); ddpe.deh_bytes = ntohl(ddpe.deh_bytes); dlen = ddpe.deh_len; if ((cksum = ddpe.deh_sum) == 0) { DDP_STATINC(DDP_STAT_NOSUM); } from.sat_addr.s_net = ddpe.deh_snet; from.sat_addr.s_node = ddpe.deh_snode; from.sat_port = ddpe.deh_sport; to.sat_addr.s_net = ddpe.deh_dnet; to.sat_addr.s_node = ddpe.deh_dnode; to.sat_port = ddpe.deh_dport; if (to.sat_addr.s_net == ATADDR_ANYNET) { TAILQ_FOREACH(aa, &at_ifaddr, aa_list) { if (phase == 1 && (aa->aa_flags & AFA_PHASE2)) continue; if (phase == 2 && (aa->aa_flags & AFA_PHASE2) == 0) continue; if (aa->aa_ifp == ifp && (AA_SAT(aa)->sat_addr.s_node == to.sat_addr.s_node || to.sat_addr.s_node == ATADDR_BCAST || (ifp->if_flags & IFF_LOOPBACK))) break; } } else { TAILQ_FOREACH(aa, &at_ifaddr, aa_list) { if (to.sat_addr.s_net == aa->aa_firstnet && to.sat_addr.s_node == 0) break; if ((ntohs(to.sat_addr.s_net) < ntohs(aa->aa_firstnet) || ntohs(to.sat_addr.s_net) > ntohs(aa->aa_lastnet)) && (ntohs(to.sat_addr.s_net) < 0xff00 || ntohs(to.sat_addr.s_net) > 0xfffe)) continue; if (to.sat_addr.s_node != AA_SAT(aa)->sat_addr.s_node && to.sat_addr.s_node != ATADDR_BCAST) continue; break; } } } /* * Adjust the length, removing any padding that may have been added * at a link layer. We do this before we attempt to forward a packet, * possibly on a different media. */ mlen = m->m_pkthdr.len; if (mlen < dlen) { DDP_STATINC(DDP_STAT_TOOSMALL); m_freem(m); return; } if (mlen > dlen) { m_adj(m, dlen - mlen); } /* * XXX Should we deliver broadcasts locally, also, or rely on the * link layer to give us a copy? For the moment, the latter. */ if (aa == NULL || (to.sat_addr.s_node == ATADDR_BCAST && aa->aa_ifp != ifp && (ifp->if_flags & IFF_LOOPBACK) == 0)) { if (ddp_forward == 0) { m_freem(m); return; } sockaddr_at_init(&u.dsta, &to.sat_addr, 0); rt = rtcache_lookup(&forwro, &u.dst); #if 0 /* XXX The if-condition is always false. What was this * actually trying to test? */ if (to.sat_addr.s_net != satocsat(rtcache_getdst(&forwro))->sat_addr.s_net && ddpe.deh_hops == DDP_MAXHOPS) { m_freem(m); return; } #endif if (ddp_firewall && (rt == NULL || rt->rt_ifp != ifp)) { rtcache_unref(rt, &forwro); m_freem(m); return; } rtcache_unref(rt, &forwro); ddpe.deh_hops++; ddpe.deh_bytes = htonl(ddpe.deh_bytes); memcpy((void *) deh, (void *) & ddpe, sizeof(u_short));/*XXX*/ if (ddp_route(m, &forwro)) { DDP_STATINC(DDP_STAT_CANTFORWARD); } else { DDP_STATINC(DDP_STAT_FORWARD); } return; } from.sat_len = sizeof(struct sockaddr_at); from.sat_family = AF_APPLETALK; if (elh) { m_adj(m, sizeof(struct ddpshdr)); } else { if (ddp_cksum && cksum && cksum != at_cksum(m, sizeof(int))) { DDP_STATINC(DDP_STAT_BADSUM); m_freem(m); return; } m_adj(m, sizeof(struct ddpehdr)); } if ((ddp = ddp_search(&from, &to, aa)) == NULL) { m_freem(m); return; } if (sbappendaddr(&ddp->ddp_socket->so_rcv, (struct sockaddr *) & from, m, (struct mbuf *) 0) == 0) { DDP_STATINC(DDP_STAT_NOSOCKSPACE); soroverflow(ddp->ddp_socket); m_freem(m); return; } #if IFA_STATS if (aa) aa->aa_ifa.ifa_data.ifad_inbytes += dlen; #endif sorwakeup(ddp->ddp_socket); } #if 0 #define BPXLEN 48 #define BPALEN 16 #include static void bprint(char *data, int len) { char xout[BPXLEN], aout[BPALEN]; int i = 0; memset(xout, 0, BPXLEN); memset(aout, 0, BPALEN); for (;;) { if (len < 1) { if (i != 0) { printf("%s\t%s\n", xout, aout); } printf("%s\n", "(end)"); break; } xout[(i * 3)] = hexdigits[(*data & 0xf0) >> 4]; xout[(i * 3) + 1] = hexdigits[*data & 0x0f]; if ((u_char) * data < 0x7f && (u_char) * data > 0x20) { aout[i] = *data; } else { aout[i] = '.'; } xout[(i * 3) + 2] = ' '; i++; len--; data++; if (i > BPALEN - 2) { printf("%s\t%s\n", xout, aout); memset(xout, 0, BPXLEN); memset(aout, 0, BPALEN); i = 0; continue; } } } static void m_printm(struct mbuf *m) { for (; m; m = m->m_next) bprint(mtod(m, char *), m->m_len); } #endif