diff options
Diffstat (limited to 'qemu/slirp/udp.c')
| -rw-r--r-- | qemu/slirp/udp.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/qemu/slirp/udp.c b/qemu/slirp/udp.c new file mode 100644 index 000000000..f77e00f5a --- /dev/null +++ b/qemu/slirp/udp.c @@ -0,0 +1,394 @@ +/* + * Copyright (c) 1982, 1986, 1988, 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. + * + * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 + * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp + */ + +/* + * Changes and additions relating to SLiRP + * Copyright (c) 1995 Danny Gasparovski. + * + * Please read the file COPYRIGHT for the + * terms and conditions of the copyright. + */ + +#include <slirp.h> +#include "ip_icmp.h" + +static uint8_t udp_tos(struct socket *so); + +void +udp_init(Slirp *slirp) +{ + slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb; + slirp->udp_last_so = &slirp->udb; +} + +void udp_cleanup(Slirp *slirp) +{ + while (slirp->udb.so_next != &slirp->udb) { + udp_detach(slirp->udb.so_next); + } +} + +/* m->m_data points at ip packet header + * m->m_len length ip packet + * ip->ip_len length data (IPDU) + */ +void +udp_input(register struct mbuf *m, int iphlen) +{ + Slirp *slirp = m->slirp; + register struct ip *ip; + register struct udphdr *uh; + int len; + struct ip save_ip; + struct socket *so; + + DEBUG_CALL("udp_input"); + DEBUG_ARG("m = %lx", (long)m); + DEBUG_ARG("iphlen = %d", iphlen); + + /* + * Strip IP options, if any; should skip this, + * make available to user, and use on returned packets, + * but we don't yet have a way to check the checksum + * with options still present. + */ + if(iphlen > sizeof(struct ip)) { + ip_stripoptions(m, (struct mbuf *)0); + iphlen = sizeof(struct ip); + } + + /* + * Get IP and UDP header together in first mbuf. + */ + ip = mtod(m, struct ip *); + uh = (struct udphdr *)((caddr_t)ip + iphlen); + + /* + * Make mbuf data length reflect UDP length. + * If not enough data to reflect UDP length, drop. + */ + len = ntohs((uint16_t)uh->uh_ulen); + + if (ip->ip_len != len) { + if (len > ip->ip_len) { + goto bad; + } + m_adj(m, len - ip->ip_len); + ip->ip_len = len; + } + + /* + * Save a copy of the IP header in case we want restore it + * for sending an ICMP error message in response. + */ + save_ip = *ip; + save_ip.ip_len+= iphlen; /* tcp_input subtracts this */ + + /* + * Checksum extended UDP header and data. + */ + if (uh->uh_sum) { + memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr)); + ((struct ipovly *)ip)->ih_x1 = 0; + ((struct ipovly *)ip)->ih_len = uh->uh_ulen; + if(cksum(m, len + sizeof(struct ip))) { + goto bad; + } + } + + /* + * handle DHCP/BOOTP + */ + if (ntohs(uh->uh_dport) == BOOTP_SERVER && + (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr || + ip->ip_dst.s_addr == 0xffffffff)) { + bootp_input(m); + goto bad; + } + + /* + * handle TFTP + */ + if (ntohs(uh->uh_dport) == TFTP_SERVER && + ip->ip_dst.s_addr == slirp->vhost_addr.s_addr) { + tftp_input(m); + goto bad; + } + + if (slirp->restricted) { + goto bad; + } + + /* + * Locate pcb for datagram. + */ + so = slirp->udp_last_so; + if (so == &slirp->udb || so->so_lport != uh->uh_sport || + so->so_laddr.s_addr != ip->ip_src.s_addr) { + struct socket *tmp; + + for (tmp = slirp->udb.so_next; tmp != &slirp->udb; + tmp = tmp->so_next) { + if (tmp->so_lport == uh->uh_sport && + tmp->so_laddr.s_addr == ip->ip_src.s_addr) { + so = tmp; + break; + } + } + if (tmp == &slirp->udb) { + so = NULL; + } else { + slirp->udp_last_so = so; + } + } + + if (so == NULL) { + /* + * If there's no socket for this packet, + * create one + */ + so = socreate(slirp); + if (!so) { + goto bad; + } + if(udp_attach(so) == -1) { + DEBUG_MISC((dfd," udp_attach errno = %d-%s\n", + errno,strerror(errno))); + sofree(so); + goto bad; + } + + /* + * Setup fields + */ + so->so_laddr = ip->ip_src; + so->so_lport = uh->uh_sport; + + if ((so->so_iptos = udp_tos(so)) == 0) + so->so_iptos = ip->ip_tos; + + /* + * XXXXX Here, check if it's in udpexec_list, + * and if it is, do the fork_exec() etc. + */ + } + + so->so_faddr = ip->ip_dst; /* XXX */ + so->so_fport = uh->uh_dport; /* XXX */ + + iphlen += sizeof(struct udphdr); + m->m_len -= iphlen; + m->m_data += iphlen; + + /* + * Now we sendto() the packet. + */ + if(sosendto(so,m) == -1) { + m->m_len += iphlen; + m->m_data -= iphlen; + *ip=save_ip; + DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno))); + icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno)); + } + + m_free(so->so_m); /* used for ICMP if error on sorecvfrom */ + + /* restore the orig mbuf packet */ + m->m_len += iphlen; + m->m_data -= iphlen; + *ip=save_ip; + so->so_m=m; /* ICMP backup */ + + return; +bad: + m_free(m); +} + +int udp_output2(struct socket *so, struct mbuf *m, + struct sockaddr_in *saddr, struct sockaddr_in *daddr, + int iptos) +{ + register struct udpiphdr *ui; + int error = 0; + + DEBUG_CALL("udp_output"); + DEBUG_ARG("so = %lx", (long)so); + DEBUG_ARG("m = %lx", (long)m); + DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr); + DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr); + + /* + * Adjust for header + */ + m->m_data -= sizeof(struct udpiphdr); + m->m_len += sizeof(struct udpiphdr); + + /* + * Fill in mbuf with extended UDP header + * and addresses and length put into network format. + */ + ui = mtod(m, struct udpiphdr *); + memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr)); + ui->ui_x1 = 0; + ui->ui_pr = IPPROTO_UDP; + ui->ui_len = htons(m->m_len - sizeof(struct ip)); + /* XXXXX Check for from-one-location sockets, or from-any-location sockets */ + ui->ui_src = saddr->sin_addr; + ui->ui_dst = daddr->sin_addr; + ui->ui_sport = saddr->sin_port; + ui->ui_dport = daddr->sin_port; + ui->ui_ulen = ui->ui_len; + + /* + * Stuff checksum and output datagram. + */ + ui->ui_sum = 0; + if ((ui->ui_sum = cksum(m, m->m_len)) == 0) + ui->ui_sum = 0xffff; + ((struct ip *)ui)->ip_len = m->m_len; + + ((struct ip *)ui)->ip_ttl = IPDEFTTL; + ((struct ip *)ui)->ip_tos = iptos; + + error = ip_output(so, m); + + return (error); +} + +int udp_output(struct socket *so, struct mbuf *m, + struct sockaddr_in *addr) + +{ + Slirp *slirp = so->slirp; + struct sockaddr_in saddr, daddr; + + saddr = *addr; + if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) == + slirp->vnetwork_addr.s_addr) { + uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr; + + if ((so->so_faddr.s_addr & inv_mask) == inv_mask) { + saddr.sin_addr = slirp->vhost_addr; + } else if (addr->sin_addr.s_addr == loopback_addr.s_addr || + so->so_faddr.s_addr != slirp->vhost_addr.s_addr) { + saddr.sin_addr = so->so_faddr; + } + } + daddr.sin_addr = so->so_laddr; + daddr.sin_port = so->so_lport; + + return udp_output2(so, m, &saddr, &daddr, so->so_iptos); +} + +int +udp_attach(struct socket *so) +{ + if((so->s = qemu_socket(AF_INET,SOCK_DGRAM,0)) != -1) { + so->so_expire = curtime + SO_EXPIRE; + insque(so, &so->slirp->udb); + } + return(so->s); +} + +void +udp_detach(struct socket *so) +{ + closesocket(so->s); + sofree(so); +} + +static const struct tos_t udptos[] = { + {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ + {0, 0, 0, 0} +}; + +static uint8_t +udp_tos(struct socket *so) +{ + int i = 0; + + while(udptos[i].tos) { + if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) || + (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) { + so->so_emu = udptos[i].emu; + return udptos[i].tos; + } + i++; + } + + return 0; +} + +struct socket * +udp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr, + u_int lport, int flags) +{ + struct sockaddr_in addr; + struct socket *so; + socklen_t addrlen = sizeof(struct sockaddr_in); + + so = socreate(slirp); + if (!so) { + return NULL; + } + so->s = qemu_socket(AF_INET,SOCK_DGRAM,0); + so->so_expire = curtime + SO_EXPIRE; + insque(so, &slirp->udb); + + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = haddr; + addr.sin_port = hport; + + if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { + udp_detach(so); + return NULL; + } + socket_set_fast_reuse(so->s); + + getsockname(so->s,(struct sockaddr *)&addr,&addrlen); + so->so_fport = addr.sin_port; + if (addr.sin_addr.s_addr == 0 || + addr.sin_addr.s_addr == loopback_addr.s_addr) { + so->so_faddr = slirp->vhost_addr; + } else { + so->so_faddr = addr.sin_addr; + } + so->so_lport = lport; + so->so_laddr.s_addr = laddr; + if (flags != SS_FACCEPTONCE) + so->so_expire = 0; + + so->so_state &= SS_PERSISTENT_MASK; + so->so_state |= SS_ISFCONNECTED | flags; + + return so; +} |