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author | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2004-04-22 00:10:48 +0000 |
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committer | bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> | 2004-04-22 00:10:48 +0000 |
commit | f0cbd3ec9f4a3de1a9ef94deda09704543889f44 (patch) | |
tree | 153d540a8c714054614f5f368a3d23432f915f17 /slirp/socket.c | |
parent | 7c1f25b46a7c9c4b953976631ae94a07e4ba531a (diff) | |
download | qemu-f0cbd3ec9f4a3de1a9ef94deda09704543889f44.zip qemu-f0cbd3ec9f4a3de1a9ef94deda09704543889f44.tar.gz qemu-f0cbd3ec9f4a3de1a9ef94deda09704543889f44.tar.bz2 |
initial user mode network support
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@733 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'slirp/socket.c')
-rw-r--r-- | slirp/socket.c | 696 |
1 files changed, 696 insertions, 0 deletions
diff --git a/slirp/socket.c b/slirp/socket.c new file mode 100644 index 0000000..396fb4a --- /dev/null +++ b/slirp/socket.c @@ -0,0 +1,696 @@ +/* + * Copyright (c) 1995 Danny Gasparovski. + * + * Please read the file COPYRIGHT for the + * terms and conditions of the copyright. + */ + +#define WANT_SYS_IOCTL_H +#include <slirp.h> +#include "ip_icmp.h" +#include "main.h" + +void +so_init() +{ + /* Nothing yet */ +} + + +struct socket * +solookup(head, laddr, lport, faddr, fport) + struct socket *head; + struct in_addr laddr; + u_int lport; + struct in_addr faddr; + u_int fport; +{ + struct socket *so; + + for (so = head->so_next; so != head; so = so->so_next) { + if (so->so_lport == lport && + so->so_laddr.s_addr == laddr.s_addr && + so->so_faddr.s_addr == faddr.s_addr && + so->so_fport == fport) + break; + } + + if (so == head) + return (struct socket *)NULL; + return so; + +} + +/* + * Create a new socket, initialise the fields + * It is the responsibility of the caller to + * insque() it into the correct linked-list + */ +struct socket * +socreate() +{ + struct socket *so; + + so = (struct socket *)malloc(sizeof(struct socket)); + if(so) { + memset(so, 0, sizeof(struct socket)); + so->so_state = SS_NOFDREF; + so->s = -1; + } + return(so); +} + +/* + * remque and free a socket, clobber cache + */ +void +sofree(so) + struct socket *so; +{ + if (so->so_emu==EMU_RSH && so->extra) { + sofree(so->extra); + so->extra=NULL; + } + if (so == tcp_last_so) + tcp_last_so = &tcb; + else if (so == udp_last_so) + udp_last_so = &udb; + + m_free(so->so_m); + + if(so->so_next && so->so_prev) + remque(so); /* crashes if so is not in a queue */ + + free(so); +} + +/* + * Read from so's socket into sb_snd, updating all relevant sbuf fields + * NOTE: This will only be called if it is select()ed for reading, so + * a read() of 0 (or less) means it's disconnected + */ +int +soread(so) + struct socket *so; +{ + int n, nn, lss, total; + struct sbuf *sb = &so->so_snd; + int len = sb->sb_datalen - sb->sb_cc; + struct iovec iov[2]; + int mss = so->so_tcpcb->t_maxseg; + + DEBUG_CALL("soread"); + DEBUG_ARG("so = %lx", (long )so); + + /* + * No need to check if there's enough room to read. + * soread wouldn't have been called if there weren't + */ + + len = sb->sb_datalen - sb->sb_cc; + + iov[0].iov_base = sb->sb_wptr; + if (sb->sb_wptr < sb->sb_rptr) { + iov[0].iov_len = sb->sb_rptr - sb->sb_wptr; + /* Should never succeed, but... */ + if (iov[0].iov_len > len) + iov[0].iov_len = len; + if (iov[0].iov_len > mss) + iov[0].iov_len -= iov[0].iov_len%mss; + n = 1; + } else { + iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr; + /* Should never succeed, but... */ + if (iov[0].iov_len > len) iov[0].iov_len = len; + len -= iov[0].iov_len; + if (len) { + iov[1].iov_base = sb->sb_data; + iov[1].iov_len = sb->sb_rptr - sb->sb_data; + if(iov[1].iov_len > len) + iov[1].iov_len = len; + total = iov[0].iov_len + iov[1].iov_len; + if (total > mss) { + lss = total%mss; + if (iov[1].iov_len > lss) { + iov[1].iov_len -= lss; + n = 2; + } else { + lss -= iov[1].iov_len; + iov[0].iov_len -= lss; + n = 1; + } + } else + n = 2; + } else { + if (iov[0].iov_len > mss) + iov[0].iov_len -= iov[0].iov_len%mss; + n = 1; + } + } + +#ifdef HAVE_READV + nn = readv(so->s, (struct iovec *)iov, n); + DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn)); +#else + nn = read(so->s, iov[0].iov_base, iov[0].iov_len); +#endif + if (nn <= 0) { + if (nn < 0 && (errno == EINTR || errno == EAGAIN)) + return 0; + else { + DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno))); + sofcantrcvmore(so); + tcp_sockclosed(sototcpcb(so)); + return -1; + } + } + +#ifndef HAVE_READV + /* + * If there was no error, try and read the second time round + * We read again if n = 2 (ie, there's another part of the buffer) + * and we read as much as we could in the first read + * We don't test for <= 0 this time, because there legitimately + * might not be any more data (since the socket is non-blocking), + * a close will be detected on next iteration. + * A return of -1 wont (shouldn't) happen, since it didn't happen above + */ + if (n == 2 && nn == iov[0].iov_len) + nn += read(so->s, iov[1].iov_base, iov[1].iov_len); + + DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn)); +#endif + + /* Update fields */ + sb->sb_cc += nn; + sb->sb_wptr += nn; + if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen)) + sb->sb_wptr -= sb->sb_datalen; + return nn; +} + +/* + * Get urgent data + * + * When the socket is created, we set it SO_OOBINLINE, + * so when OOB data arrives, we soread() it and everything + * in the send buffer is sent as urgent data + */ +void +sorecvoob(so) + struct socket *so; +{ + struct tcpcb *tp = sototcpcb(so); + + DEBUG_CALL("sorecvoob"); + DEBUG_ARG("so = %lx", (long)so); + + /* + * We take a guess at how much urgent data has arrived. + * In most situations, when urgent data arrives, the next + * read() should get all the urgent data. This guess will + * be wrong however if more data arrives just after the + * urgent data, or the read() doesn't return all the + * urgent data. + */ + soread(so); + tp->snd_up = tp->snd_una + so->so_snd.sb_cc; + tp->t_force = 1; + tcp_output(tp); + tp->t_force = 0; +} + +/* + * Send urgent data + * There's a lot duplicated code here, but... + */ +int +sosendoob(so) + struct socket *so; +{ + struct sbuf *sb = &so->so_rcv; + char buff[2048]; /* XXX Shouldn't be sending more oob data than this */ + + int n, len; + + DEBUG_CALL("sosendoob"); + DEBUG_ARG("so = %lx", (long)so); + DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc); + + if (so->so_urgc > 2048) + so->so_urgc = 2048; /* XXXX */ + + if (sb->sb_rptr < sb->sb_wptr) { + /* We can send it directly */ + n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */ + so->so_urgc -= n; + + DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc)); + } else { + /* + * Since there's no sendv or sendtov like writev, + * we must copy all data to a linear buffer then + * send it all + */ + len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr; + if (len > so->so_urgc) len = so->so_urgc; + memcpy(buff, sb->sb_rptr, len); + so->so_urgc -= len; + if (so->so_urgc) { + n = sb->sb_wptr - sb->sb_data; + if (n > so->so_urgc) n = so->so_urgc; + memcpy((buff + len), sb->sb_data, n); + so->so_urgc -= n; + len += n; + } + n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */ +#ifdef DEBUG + if (n != len) + DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n")); +#endif + DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc)); + } + + sb->sb_cc -= n; + sb->sb_rptr += n; + if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen)) + sb->sb_rptr -= sb->sb_datalen; + + return n; +} + +/* + * Write data from so_rcv to so's socket, + * updating all sbuf field as necessary + */ +int +sowrite(so) + struct socket *so; +{ + int n,nn; + struct sbuf *sb = &so->so_rcv; + int len = sb->sb_cc; + struct iovec iov[2]; + + DEBUG_CALL("sowrite"); + DEBUG_ARG("so = %lx", (long)so); + + if (so->so_urgc) { + sosendoob(so); + if (sb->sb_cc == 0) + return 0; + } + + /* + * No need to check if there's something to write, + * sowrite wouldn't have been called otherwise + */ + + len = sb->sb_cc; + + iov[0].iov_base = sb->sb_rptr; + if (sb->sb_rptr < sb->sb_wptr) { + iov[0].iov_len = sb->sb_wptr - sb->sb_rptr; + /* Should never succeed, but... */ + if (iov[0].iov_len > len) iov[0].iov_len = len; + n = 1; + } else { + iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr; + if (iov[0].iov_len > len) iov[0].iov_len = len; + len -= iov[0].iov_len; + if (len) { + iov[1].iov_base = sb->sb_data; + iov[1].iov_len = sb->sb_wptr - sb->sb_data; + if (iov[1].iov_len > len) iov[1].iov_len = len; + n = 2; + } else + n = 1; + } + /* Check if there's urgent data to send, and if so, send it */ + +#ifdef HAVE_READV + nn = writev(so->s, (const struct iovec *)iov, n); + + DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn)); +#else + nn = write(so->s, iov[0].iov_base, iov[0].iov_len); +#endif + /* This should never happen, but people tell me it does *shrug* */ + if (nn < 0 && (errno == EAGAIN || errno == EINTR)) + return 0; + + if (nn <= 0) { + DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n", + so->so_state, errno)); + sofcantsendmore(so); + tcp_sockclosed(sototcpcb(so)); + return -1; + } + +#ifndef HAVE_READV + if (n == 2 && nn == iov[0].iov_len) + nn += write(so->s, iov[1].iov_base, iov[1].iov_len); + DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn)); +#endif + + /* Update sbuf */ + sb->sb_cc -= nn; + sb->sb_rptr += nn; + if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen)) + sb->sb_rptr -= sb->sb_datalen; + + /* + * If in DRAIN mode, and there's no more data, set + * it CANTSENDMORE + */ + if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0) + sofcantsendmore(so); + + return nn; +} + +/* + * recvfrom() a UDP socket + */ +void +sorecvfrom(so) + struct socket *so; +{ + struct sockaddr_in addr; + int addrlen = sizeof(struct sockaddr_in); + + DEBUG_CALL("sorecvfrom"); + DEBUG_ARG("so = %lx", (long)so); + + if (so->so_type == IPPROTO_ICMP) { /* This is a "ping" reply */ + char buff[256]; + int len; + + len = recvfrom(so->s, buff, 256, 0, + (struct sockaddr *)&addr, &addrlen); + /* XXX Check if reply is "correct"? */ + + if(len == -1 || len == 0) { + u_char code=ICMP_UNREACH_PORT; + + if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST; + else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET; + + DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n", + errno,strerror(errno))); + icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno)); + } else { + icmp_reflect(so->so_m); + so->so_m = 0; /* Don't m_free() it again! */ + } + /* No need for this socket anymore, udp_detach it */ + udp_detach(so); + } else { /* A "normal" UDP packet */ + struct mbuf *m; + int len, n; + + if (!(m = m_get())) return; + m->m_data += if_maxlinkhdr; + + /* + * XXX Shouldn't FIONREAD packets destined for port 53, + * but I don't know the max packet size for DNS lookups + */ + len = M_FREEROOM(m); + /* if (so->so_fport != htons(53)) { */ + ioctl(so->s, FIONREAD, &n); + + if (n > len) { + n = (m->m_data - m->m_dat) + m->m_len + n + 1; + m_inc(m, n); + len = M_FREEROOM(m); + } + /* } */ + + m->m_len = recvfrom(so->s, m->m_data, len, 0, + (struct sockaddr *)&addr, &addrlen); + DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n", + m->m_len, errno,strerror(errno))); + if(m->m_len<0) { + u_char code=ICMP_UNREACH_PORT; + + if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST; + else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET; + + DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code)); + icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno)); + m_free(m); + } else { + /* + * Hack: domain name lookup will be used the most for UDP, + * and since they'll only be used once there's no need + * for the 4 minute (or whatever) timeout... So we time them + * out much quicker (10 seconds for now...) + */ + if (so->so_expire) { + if (so->so_fport == htons(53)) + so->so_expire = curtime + SO_EXPIREFAST; + else + so->so_expire = curtime + SO_EXPIRE; + } + + /* if (m->m_len == len) { + * m_inc(m, MINCSIZE); + * m->m_len = 0; + * } + */ + + /* + * If this packet was destined for CTL_ADDR, + * make it look like that's where it came from, done by udp_output + */ + udp_output(so, m, &addr); + } /* rx error */ + } /* if ping packet */ +} + +/* + * sendto() a socket + */ +int +sosendto(so, m) + struct socket *so; + struct mbuf *m; +{ + int ret; + struct sockaddr_in addr; + + DEBUG_CALL("sosendto"); + DEBUG_ARG("so = %lx", (long)so); + DEBUG_ARG("m = %lx", (long)m); + + addr.sin_family = AF_INET; + if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) { + /* It's an alias */ + switch(ntohl(so->so_faddr.s_addr) & 0xff) { + case CTL_DNS: + addr.sin_addr = dns_addr; + break; + case CTL_ALIAS: + default: + addr.sin_addr = loopback_addr; + break; + } + } else + addr.sin_addr = so->so_faddr; + addr.sin_port = so->so_fport; + + DEBUG_MISC((dfd, " sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n", ntohs(addr.sin_port), inet_ntoa(addr.sin_addr))); + + /* Don't care what port we get */ + ret = sendto(so->s, m->m_data, m->m_len, 0, + (struct sockaddr *)&addr, sizeof (struct sockaddr)); + if (ret < 0) + return -1; + + /* + * Kill the socket if there's no reply in 4 minutes, + * but only if it's an expirable socket + */ + if (so->so_expire) + so->so_expire = curtime + SO_EXPIRE; + so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */ + return 0; +} + +/* + * XXX This should really be tcp_listen + */ +struct socket * +solisten(port, laddr, lport, flags) + u_int port; + u_int32_t laddr; + u_int lport; + int flags; +{ + struct sockaddr_in addr; + struct socket *so; + int s, addrlen = sizeof(addr), opt = 1; + + DEBUG_CALL("solisten"); + DEBUG_ARG("port = %d", port); + DEBUG_ARG("laddr = %x", laddr); + DEBUG_ARG("lport = %d", lport); + DEBUG_ARG("flags = %x", flags); + + if ((so = socreate()) == NULL) { + /* free(so); Not sofree() ??? free(NULL) == NOP */ + return NULL; + } + + /* Don't tcp_attach... we don't need so_snd nor so_rcv */ + if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) { + free(so); + return NULL; + } + insque(so,&tcb); + + /* + * SS_FACCEPTONCE sockets must time out. + */ + if (flags & SS_FACCEPTONCE) + so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2; + + so->so_state = (SS_FACCEPTCONN|flags); + so->so_lport = lport; /* Kept in network format */ + so->so_laddr.s_addr = laddr; /* Ditto */ + + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = INADDR_ANY; + addr.sin_port = port; + + if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) || + (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) || + (listen(s,1) < 0)) { + int tmperrno = errno; /* Don't clobber the real reason we failed */ + + close(s); + sofree(so); + /* Restore the real errno */ + errno = tmperrno; + return NULL; + } + setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); + setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); + + getsockname(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 = our_addr; + else + so->so_faddr = addr.sin_addr; + + so->s = s; + return so; +} + +/* + * Data is available in so_rcv + * Just write() the data to the socket + * XXX not yet... + */ +void +sorwakeup(so) + struct socket *so; +{ +/* sowrite(so); */ +/* FD_CLR(so->s,&writefds); */ +} + +/* + * Data has been freed in so_snd + * We have room for a read() if we want to + * For now, don't read, it'll be done in the main loop + */ +void +sowwakeup(so) + struct socket *so; +{ + /* Nothing, yet */ +} + +/* + * Various session state calls + * XXX Should be #define's + * The socket state stuff needs work, these often get call 2 or 3 + * times each when only 1 was needed + */ +void +soisfconnecting(so) + register struct socket *so; +{ + so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE| + SS_FCANTSENDMORE|SS_FWDRAIN); + so->so_state |= SS_ISFCONNECTING; /* Clobber other states */ +} + +void +soisfconnected(so) + register struct socket *so; +{ + so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF); + so->so_state |= SS_ISFCONNECTED; /* Clobber other states */ +} + +void +sofcantrcvmore(so) + struct socket *so; +{ + if ((so->so_state & SS_NOFDREF) == 0) { + shutdown(so->s,0); + FD_CLR(so->s, global_writefds); + } + so->so_state &= ~(SS_ISFCONNECTING); + if (so->so_state & SS_FCANTSENDMORE) + so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */ + else + so->so_state |= SS_FCANTRCVMORE; +} + +void +sofcantsendmore(so) + struct socket *so; +{ + if ((so->so_state & SS_NOFDREF) == 0) { + shutdown(so->s,1); /* send FIN to fhost */ + FD_CLR(so->s, global_readfds); + FD_CLR(so->s, global_xfds); + } + so->so_state &= ~(SS_ISFCONNECTING); + if (so->so_state & SS_FCANTRCVMORE) + so->so_state = SS_NOFDREF; /* as above */ + else + so->so_state |= SS_FCANTSENDMORE; +} + +void +soisfdisconnected(so) + struct socket *so; +{ +/* so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */ +/* close(so->s); */ +/* so->so_state = SS_ISFDISCONNECTED; */ + /* + * XXX Do nothing ... ? + */ +} + +/* + * Set write drain mode + * Set CANTSENDMORE once all data has been write()n + */ +void +sofwdrain(so) + struct socket *so; +{ + if (so->so_rcv.sb_cc) + so->so_state |= SS_FWDRAIN; + else + sofcantsendmore(so); +} + |