X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d52fe63fc81f7e44faaae711812a211a78434976..9bccf70c0258c7cac2dcb80011b2a964d884c552:/bsd/netinet/udp_usrreq.c diff --git a/bsd/netinet/udp_usrreq.c b/bsd/netinet/udp_usrreq.c index cce4259d4..4dde880ce 100644 --- a/bsd/netinet/udp_usrreq.c +++ b/bsd/netinet/udp_usrreq.c @@ -52,6 +52,7 @@ * SUCH DAMAGE. * * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 + * $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.64.2.13 2001/08/08 18:59:54 ghelmer Exp $ */ #include @@ -59,41 +60,37 @@ #include #include #include -#if INET6 #include -#endif #include #include #include #include #include -#if ISFB31 -#include -#endif - - #include #include #include #include #include +#if INET6 +#include +#endif #include #include #include -#include -#include #if INET6 -#include #include #endif +#include +#include #include #include #include #if IPSEC #include +extern int ipsec_bypass; #endif /*IPSEC*/ @@ -105,10 +102,6 @@ #define DBG_FNC_UDP_OUTPUT NETDBG_CODE(DBG_NETUDP, (6 << 8) | 1) -#ifndef offsetof /* XXX */ -#define offsetof(type, member) ((size_t)(&((type *)0)->member)) -#endif - #define __STDC__ 1 /* * UDP protocol implementation. @@ -122,9 +115,13 @@ static int udpcksum = 0; /* XXX */ SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udpcksum, 0, ""); -int log_in_vain; +int log_in_vain = 0; SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, - &log_in_vain, 0, ""); + &log_in_vain, 0, "Log all incoming UDP packets"); + +static int blackhole = 0; +SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, + &blackhole, 0, "Do not send port unreachables for refused connects"); struct inpcbhead udb; /* from udp_var.h */ #define udb6 udb /* for KAME src sync over BSD*'s */ @@ -138,7 +135,7 @@ extern int apple_hwcksum_rx; struct udpstat udpstat; /* from udp_var.h */ SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD, - &udpstat, udpstat, ""); + &udpstat, udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)"); static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; #if INET6 @@ -162,8 +159,8 @@ static void ip_2_ip6_hdr __P((struct ip6_hdr *ip6, struct ip *ip)); #endif static int udp_detach __P((struct socket *so)); -static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *, - struct mbuf *, struct proc *)); +static int udp_output __P((struct inpcb *, struct mbuf *, struct sockaddr *, + struct mbuf *, struct proc *)); void udp_init() @@ -180,18 +177,19 @@ udp_init() udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask); udbinfo.porthashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.porthashmask); -#if ISFB31 - udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, - ZONE_INTERRUPT, 0); -#else +#ifdef __APPLE__ str_size = (vm_size_t) sizeof(struct inpcb); - udbinfo.ipi_zone = (void *) zinit(str_size, 80000*str_size, 8192, "inpcb_zone"); -#endif + udbinfo.ipi_zone = (void *) zinit(str_size, 80000*str_size, 8192, "udpcb"); udbinfo.last_pcb = 0; in_pcb_nat_init(&udbinfo, AF_INET, IPPROTO_UDP, SOCK_DGRAM); +#else + udbinfo.ipi_zone = zinit("udpcb", sizeof(struct inpcb), maxsockets, + ZONE_INTERRUPT, 0); +#endif #if 0 + /* for pcb sharing testing only */ stat = in_pcb_new_share_client(&udbinfo, &fake_owner); kprintf("udp_init in_pcb_new_share_client - stat = %d\n", stat); @@ -226,20 +224,15 @@ udp_input(m, iphlen) register struct udphdr *uh; register struct inpcb *inp; struct mbuf *opts = 0; -#if INET6 - struct ip6_recvpktopts opts6; -#endif int len; struct ip save_ip; struct sockaddr *append_sa; udpstat.udps_ipackets++; -#if INET6 - bzero(&opts6, sizeof(opts6)); -#endif - KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_START, 0,0,0,0,0); + if (m->m_pkthdr.csum_flags & CSUM_TCP_SUM16) + m->m_pkthdr.csum_flags = 0; /* invalidate hwcksum for UDP */ /* * Strip IP options, if any; should skip this, @@ -250,8 +243,6 @@ udp_input(m, iphlen) if (iphlen > sizeof (struct ip)) { ip_stripoptions(m, (struct mbuf *)0); iphlen = sizeof(struct ip); - if (m->m_pkthdr.csum_flags & CSUM_TCP_SUM16) - m->m_pkthdr.csum_flags = 0; /* invalidate hwcksum */ } /* @@ -268,6 +259,10 @@ udp_input(m, iphlen) } uh = (struct udphdr *)((caddr_t)ip + iphlen); + /* destination port of 0 is illegal, based on RFC768. */ + if (uh->uh_dport == 0) + goto bad; + KERNEL_DEBUG(DBG_LAYER_IN_BEG, uh->uh_dport, uh->uh_sport, ip->ip_src.s_addr, ip->ip_dst.s_addr, uh->uh_ulen); @@ -297,17 +292,8 @@ udp_input(m, iphlen) if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) uh->uh_sum = m->m_pkthdr.csum_data; - else { - if (apple_hwcksum_rx && (m->m_pkthdr.csum_flags & CSUM_TCP_SUM16)) { - bzero(((struct ipovly *)ip)->ih_x1, 9); - ((struct ipovly *)ip)->ih_len = uh->uh_ulen; - uh->uh_sum = in_addword(in_cksum(m, sizeof(struct ip)), - m->m_pkthdr.csum_data & 0xFFFF); - } - else { - goto doudpcksum; - } - } + else + goto doudpcksum; uh->uh_sum ^= 0xffff; } else { doudpcksum: @@ -322,6 +308,10 @@ doudpcksum: return; } } +#ifndef __APPLE__ + else + udpstat.udps_nosum++; +#endif if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { @@ -356,6 +346,11 @@ doudpcksum: udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; #endif LIST_FOREACH(inp, &udb, inp_list) { +#ifdef __APPLE__ + /* Ignore nat/SharedIP dummy pcbs */ + if (inp->inp_socket == &udbinfo.nat_dummy_socket) + continue; +#endif #if INET6 if ((inp->inp_vflag & INP_IPV4) == 0) continue; @@ -379,14 +374,15 @@ doudpcksum: #if IPSEC /* check AH/ESP integrity. */ - if (ipsec4_in_reject_so(m, last->inp_socket)) { + if (ipsec_bypass == 0 && ipsec4_in_reject_so(m, last->inp_socket)) { ipsecstat.in_polvio++; /* do not inject data to pcb */ } else #endif /*IPSEC*/ if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { - udp_append(last, ip, n, iphlen + - sizeof (struct udphdr)); + udp_append(last, ip, n, + iphlen + + sizeof(struct udphdr)); } } last = inp; @@ -412,14 +408,13 @@ doudpcksum: goto bad; } #if IPSEC - else /* check AH/ESP integrity. */ - if (m && ipsec4_in_reject_so(m, last->inp_socket)) { + if (ipsec_bypass == 0 && m && ipsec4_in_reject_so(m, last->inp_socket)) { ipsecstat.in_polvio++; goto bad; } #endif /*IPSEC*/ - udp_append(last, ip, m, iphlen + sizeof (struct udphdr)); + udp_append(last, ip, m, iphlen + sizeof(struct udphdr)); return; } /* @@ -442,17 +437,20 @@ doudpcksum: udpstat.udps_noportbcast++; goto bad; } - *ip = save_ip; #if ICMP_BANDLIM - if (badport_bandlim(0) < 0) + if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) goto bad; #endif + if (blackhole) + goto bad; + *ip = save_ip; + ip->ip_len += iphlen; icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0); return; } #if IPSEC - if (inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) { + if (ipsec_bypass == 0 && inp != NULL && ipsec4_in_reject_so(m, inp->inp_socket)) { ipsecstat.in_polvio++; goto bad; } @@ -473,15 +471,13 @@ doudpcksum: ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); savedflags = inp->inp_flags; inp->inp_flags &= ~INP_UNMAPPABLEOPTS; - ip6_savecontrol(inp, &udp_ip6.uip6_ip6, m, - &opts6, NULL); - + ip6_savecontrol(inp, &opts, &udp_ip6.uip6_ip6, m); inp->inp_flags = savedflags; } else #endif ip_savecontrol(inp, &opts, ip, m); } - m_adj(m, iphlen + sizeof(struct udphdr)); + m_adj(m, iphlen + sizeof(struct udphdr)); KERNEL_DEBUG(DBG_LAYER_IN_END, uh->uh_dport, uh->uh_sport, save_ip.ip_src.s_addr, save_ip.ip_dst.s_addr, uh->uh_ulen); @@ -490,7 +486,6 @@ doudpcksum: if (inp->inp_vflag & INP_IPV6) { in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); append_sa = (struct sockaddr *)&udp_in6; - opts = opts6.head; } else #endif append_sa = (struct sockaddr *)&udp_in; @@ -506,6 +501,7 @@ bad: if (opts) m_freem(opts); KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0,0,0,0,0); + return; } #if INET6 @@ -536,14 +532,10 @@ udp_append(last, ip, n, off) struct inpcb *last; struct ip *ip; struct mbuf *n; + int off; { struct sockaddr *append_sa; struct mbuf *opts = 0; -#if INET6 - struct ip6_recvpktopts opts6; - bzero(&opts6, sizeof(opts6)); -#endif - if (last->inp_flags & INP_CONTROLOPTS || last->inp_socket->so_options & SO_TIMESTAMP) { @@ -557,8 +549,7 @@ udp_append(last, ip, n, off) } savedflags = last->inp_flags; last->inp_flags &= ~INP_UNMAPPABLEOPTS; - ip6_savecontrol(last, &udp_ip6.uip6_ip6, n, - &opts6, NULL); + ip6_savecontrol(last, &opts, &udp_ip6.uip6_ip6, n); last->inp_flags = savedflags; } else #endif @@ -571,12 +562,10 @@ udp_append(last, ip, n, off) udp_in6.uin6_init_done = 1; } append_sa = (struct sockaddr *)&udp_in6.uin6_sin; - opts = opts6.head; } else #endif append_sa = (struct sockaddr *)&udp_in; m_adj(n, off); - if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, n, opts) == 0) { m_freem(n); if (opts) @@ -586,8 +575,6 @@ udp_append(last, ip, n, off) sorwakeup(last->inp_socket); } - - /* * Notify a udp user of an asynchronous error; * just wake up so that he can collect error status. @@ -608,21 +595,36 @@ udp_ctlinput(cmd, sa, vip) struct sockaddr *sa; void *vip; { - register struct ip *ip = vip; - register struct udphdr *uh; + struct ip *ip = vip; + struct udphdr *uh; + void (*notify) __P((struct inpcb *, int)) = udp_notify; + struct in_addr faddr; + struct inpcb *inp; + int s; + + faddr = ((struct sockaddr_in *)sa)->sin_addr; + if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) + return; - if (!PRC_IS_REDIRECT(cmd) && - ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)) + if (PRC_IS_REDIRECT(cmd)) { + ip = 0; + notify = in_rtchange; + } else if (cmd == PRC_HOSTDEAD) + ip = 0; + else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) return; if (ip) { + s = splnet(); uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); - in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport, - cmd, udp_notify); + inp = in_pcblookup_hash(&udbinfo, faddr, uh->uh_dport, + ip->ip_src, uh->uh_sport, 0, NULL); + if (inp != NULL && inp->inp_socket != NULL) + (*notify)(inp, inetctlerrmap[cmd]); + splx(s); } else - in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); + in_pcbnotifyall(&udb, faddr, inetctlerrmap[cmd], notify); } - static int udp_pcblist SYSCTL_HANDLER_ARGS { @@ -660,19 +662,19 @@ udp_pcblist SYSCTL_HANDLER_ARGS error = SYSCTL_OUT(req, &xig, sizeof xig); if (error) return error; - /* - * We are done if there is no pcb - */ - if (n == 0) - return 0; + /* + * We are done if there is no pcb + */ + if (n == 0) + return 0; inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK); if (inp_list == 0) { return ENOMEM; } - s = splnet(); - for (inp = udbinfo.listhead->lh_first, i = 0; inp && i < n; - inp = inp->inp_list.le_next) { + + for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n; + inp = LIST_NEXT(inp, inp_list)) { if (inp->inp_gencnt <= gencnt) inp_list[i++] = inp; } @@ -719,7 +721,7 @@ SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, static int udp_output(inp, m, addr, control, p) register struct inpcb *inp; - register struct mbuf *m; + struct mbuf *m; struct sockaddr *addr; struct mbuf *control; struct proc *p; @@ -781,26 +783,25 @@ udp_output(inp, m, addr, control, p) * and addresses and length put into network format. */ ui = mtod(m, struct udpiphdr *); - bzero(ui->ui_x1, sizeof(ui->ui_x1)); + bzero(ui->ui_x1, sizeof(ui->ui_x1)); /* XXX still needed? */ ui->ui_pr = IPPROTO_UDP; - ui->ui_len = htons((u_short)len + sizeof (struct udphdr)); ui->ui_src = inp->inp_laddr; ui->ui_dst = inp->inp_faddr; ui->ui_sport = inp->inp_lport; ui->ui_dport = inp->inp_fport; - ui->ui_ulen = ui->ui_len; + ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); /* - * Stuff checksum and output datagram. + * Set up checksum and output datagram. */ if (udpcksum) { - ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, - htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); - m->m_pkthdr.csum_flags = CSUM_UDP; - m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); - } - else + ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, + htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); + m->m_pkthdr.csum_flags = CSUM_UDP; + m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); + } else { ui->ui_sum = 0; + } ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ @@ -809,13 +810,14 @@ udp_output(inp, m, addr, control, p) KERNEL_DEBUG(DBG_LAYER_OUT_END, ui->ui_dport, ui->ui_sport, ui->ui_src.s_addr, ui->ui_dst.s_addr, ui->ui_ulen); - #if IPSEC - ipsec_setsocket(m, inp->inp_socket); + if (ipsec_bypass == 0 && ipsec_setsocket(m, inp->inp_socket) != 0) { + error = ENOBUFS; + goto release; + } #endif /*IPSEC*/ - error = ip_output(m, inp->inp_options, &inp->inp_route, - inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), + (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)), inp->inp_moptions); if (addr) { @@ -835,18 +837,17 @@ release: u_long udp_sendspace = 9216; /* really max datagram size */ /* 40 1K datagrams */ SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, - &udp_sendspace, 0, ""); - + &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); -u_long udp_recvspace = 40 * (1024 + /* 40 1K datagrams */ +u_long udp_recvspace = 40 * (1024 + #if INET6 sizeof(struct sockaddr_in6) -#else /* INET6 */ +#else sizeof(struct sockaddr_in) -#endif /* INET6 */ +#endif ); SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, - &udp_recvspace, 0, ""); + &udp_recvspace, 0, "Maximum incoming UDP datagram size"); static int udp_abort(struct socket *so) @@ -870,29 +871,21 @@ udp_attach(struct socket *so, int proto, struct proc *p) struct inpcb *inp; int error; long s; - if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { - error = soreserve(so, udp_sendspace, udp_recvspace); - if (error) - return error; - } + inp = sotoinpcb(so); + if (inp != 0) + return EINVAL; + + error = soreserve(so, udp_sendspace, udp_recvspace); + if (error) + return error; s = splnet(); error = in_pcballoc(so, &udbinfo, p); splx(s); - if (error) - return error; - error = soreserve(so, udp_sendspace, udp_recvspace); if (error) return error; inp = (struct inpcb *)so->so_pcb; inp->inp_vflag |= INP_IPV4; inp->inp_ip_ttl = ip_defttl; -#if IPSEC - error = ipsec_init_policy(so, &inp->inp_sp); - if (error != 0) { - in_pcbdetach(inp); - return error; - } -#endif /*IPSEC*/ return 0; }