2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 #include <afsconfig.h>
11 #include "afs/param.h"
14 #include <sys/malloc.h>
15 #include "rx/rx_kcommon.h"
17 #ifdef RXK_LISTENER_ENV
19 osi_NetReceive(osi_socket asocket, struct sockaddr_in *addr,
20 struct iovec *dvec, int nvecs, int *alength)
24 struct iovec iov[RX_MAXIOVECS];
25 struct sockaddr *sa = NULL;
28 int haveGlock = ISAFS_GLOCK();
30 memset(&u, 0, sizeof(u));
31 memset(&iov, 0, sizeof(iov));
33 /*AFS_STATCNT(osi_NetReceive); */
35 if (nvecs > RX_MAXIOVECS)
36 osi_Panic("osi_NetReceive: %d: Too many iovecs.\n", nvecs);
38 for (i = 0; i < nvecs; i++)
44 u.uio_resid = *alength;
45 u.uio_segflg = UIO_SYSSPACE;
51 code = soreceive(asocket, &sa, &u, NULL, NULL, NULL);
58 Debugger("afs NetReceive busted");
65 *alength -= u.uio_resid;
67 if (sa->sa_family == AF_INET) {
69 *addr = *(struct sockaddr_in *)sa;
71 printf("Unknown socket family %d in NetReceive\n", sa->sa_family);
77 extern int rxk_ListenerPid;
79 osi_StopListener(void)
81 struct sockaddr_in taddr;
88 * Have to drop global lock to safely do this.
89 * soclose() is currently protected by Giant,
90 * but pfind and psignal are MPSAFE.
92 int haveGlock = ISAFS_GLOCK();
95 soshutdown(rx_socket, SHUT_RDWR);
96 p = pfind(rxk_ListenerPid);
98 afs_warn("osi_StopListener: rxk_ListenerPid %u\n", rxk_ListenerPid);
99 kern_psignal(p, SIGUSR1);
102 afs_warn("osi_StopListener: rxk_Listener not found (pid %u)\n",
105 /* Avoid destroying socket until osi_NetReceive has
106 * had a chance to clean up. Otherwise we can't restart. */
107 bzero(&taddr, sizeof(taddr));
108 taddr.sin_len = sizeof(struct sockaddr_in);
109 taddr.sin_family = AF_INET;
110 taddr.sin_port = rx_port;
111 taddr.sin_addr.s_addr = htonl(0x7f000001); /* no place like localhost */
112 bzero(&dvec, sizeof(dvec));
115 /* afs_osi_Sleep requires the GLOCK */
117 while(rxk_ListenerPid) {
118 afs_warn("waiting for rxk_ListenerPid to die\n");
119 osi_NetSend(rx_socket, &taddr, &dvec, 1, 1, 0);
120 afs_osi_Sleep(&rxk_ListenerPid);
123 /* in theory, we are now the only people doing anything with rx_socket */
131 osi_NetSend(osi_socket asocket, struct sockaddr_in *addr, struct iovec *dvec,
132 int nvecs, afs_int32 alength, int istack)
136 struct iovec iov[RX_MAXIOVECS];
138 int haveGlock = ISAFS_GLOCK();
140 memset(&u, 0, sizeof(u));
141 memset(&iov, 0, sizeof(iov));
143 AFS_STATCNT(osi_NetSend);
144 if (nvecs > RX_MAXIOVECS)
145 osi_Panic("osi_NetSend: %d: Too many iovecs.\n", nvecs);
147 for (i = 0; i < nvecs; i++)
151 u.uio_iovcnt = nvecs;
153 u.uio_resid = alength;
154 u.uio_segflg = UIO_SYSSPACE;
155 u.uio_rw = UIO_WRITE;
158 addr->sin_len = sizeof(struct sockaddr_in);
166 sosend(asocket, (struct sockaddr *)addr, &u, NULL, NULL, 0,
171 Debugger("afs NetSend busted");
181 /* This code *almost* works :( */
182 static struct protosw parent_proto; /* udp proto switch */
183 static void rxk_input(struct mbuf *am, int iphlen);
184 static void rxk_fasttimo(void);
186 /* start intercepting basic calls */
189 struct protosw *tpro, *last;
193 last = inetdomain.dom_protoswNPROTOSW;
194 for (tpro = inetdomain.dom_protosw; tpro < last; tpro++)
195 if (tpro->pr_protocol == IPPROTO_UDP) {
196 memcpy(&parent_proto, tpro, sizeof(parent_proto));
197 tpro->pr_input = rxk_input;
198 tpro->pr_fasttimo = rxk_fasttimo;
200 * don't bother with pr_drain and pr_ctlinput
201 * until we have something to do
206 osi_Panic("inet:no udp");
211 rxk_input(struct mbuf *am, int iphlen)
218 struct udpiphdr *tvu;
222 struct sockaddr_in taddr;
225 int data_len, comp_sum;
230 /* make sure we have base ip and udp headers in first mbuf */
231 if (iphlen > sizeof(struct ip)) {
232 ip_stripoptions(am, NULL);
233 iphlen = sizeof(struct ip);
236 if (am->m_len < sizeof(struct udpiphdr)) {
237 am = m_pullup(am, sizeof(struct udpiphdr));
244 ti = mtod(am, struct ip *);
245 /* skip basic ip hdr */
246 tu = (struct udphdr *)(((char *)ti) + sizeof(struct ip));
248 /* now read the port out */
252 for (tsp = rxk_ports, i = 0; i < MAXRXPORTS; i++) {
253 if (*tsp++ == port) {
254 /* checksum the packet */
256 * Make mbuf data length reflect UDP length.
257 * If not enough data to reflect UDP length, drop.
259 tvu = (struct udpiphdr *)ti;
260 tlen = ntohs((u_short) tvu->ui_ulen);
261 if ((int)ti->ip_len != tlen) {
262 if (tlen > (int)ti->ip_len) {
267 m_adj(am, tlen - (int)ti->ip_len);
269 /* deliver packet to rx */
270 taddr.sin_family = AF_INET; /* compute source address */
271 taddr.sin_port = tu->uh_sport;
272 taddr.sin_addr.s_addr = ti->ip_src.s_addr;
273 taddr.sin_len = sizeof(taddr);
274 tvu = (struct udpiphdr *)ti; /* virtual udp structure, for cksum */
275 /* handle the checksum. Note that this code damages the actual ip
276 * header (replacing it with the virtual one, which is the same size),
277 * so we must ensure we get everything out we need, first */
278 if (tu->uh_sum != 0) {
279 /* if the checksum is there, always check it. It's crazy not
280 * to, unless you can really be sure that your
281 * underlying network (and interfaces and drivers and
282 * DMA hardware, etc!) is error-free. First, fill
283 * in entire virtual ip header. */
284 memset(tvu->ui_i.ih_x1, 0, 9);
285 tvu->ui_len = tvu->ui_ulen;
286 tlen = ntohs((unsigned short)(tvu->ui_ulen));
287 if (in_cksum(am, sizeof(struct ip) + tlen)) {
288 /* checksum, including cksum field, doesn't come out 0, so
289 * this packet is bad */
297 * 28 is IP (20) + UDP (8) header. ulen includes
298 * udp header, and we *don't* tell RX about udp
299 * header either. So, we remove those 8 as well.
301 data_len = ntohs(tu->uh_ulen);
303 if (!(*rxk_GetPacketProc) (&phandle, data_len)) {
304 if (rx_mb_to_packet(am, m_freem, 28, data_len, phandle)) {
305 /* XXX should just increment counter here.. */
306 printf("rx: truncated UDP packet\n");
307 rxi_FreePacket(phandle);
309 (*rxk_PacketArrivalProc) (phandle, &taddr,
310 rxk_portRocks[i], data_len);
319 /* if we get here, try to deliver packet to udp */
320 if (tproc = parent_proto.pr_input)
321 (*tproc) (am, iphlen);
328 * UDP fast timer to raise events for all but Solaris and NCR.
329 * Called about 5 times per second (at unknown priority?). Must go to
330 * splnet or obtain global lock before touching anything significant.
338 /* do rx fasttimo processing here */
339 rxevent_RaiseEvents(&temp);
340 if (tproc = parent_proto.pr_fasttimo)
344 /* rx_NetSend - send asize bytes at adata from asocket to host at addr.
346 * Now, why do we allocate a new buffer when we could theoretically use the one
347 * pointed to by adata? Because PRU_SEND returns after queueing the message,
348 * not after sending it. If the sender changes the data after queueing it,
349 * we'd see the already-queued data change. One attempt to fix this without
350 * adding a copy would be to have this function wait until the datagram is
351 * sent; however this doesn't work well. In particular, if a host is down, and
352 * an ARP fails to that host, this packet will be queued until the ARP request
353 * comes back, which could be hours later. We can't block in this routine that
354 * long, since it prevents RPC timeouts from happening.
356 /* XXX In the brave new world, steal the data bufs out of the rx_packet iovec,
357 * and just queue those. XXX
360 /* set lock on sockbuf sb; can't call sblock since we're at interrupt level
366 AFS_STATCNT(trysblock);
367 if (sb->sb_flags & SB_LOCK) {
368 return -1; /* can't lock socket */
370 sb->sb_flags |= SB_LOCK;
374 /* We only have to do all the mbuf management ourselves if we can be called at
375 interrupt time. in RXK_LISTENER_ENV, we can just call sosend() */
377 osi_NetSend(osi_socket asocket, struct sockaddr_in *addr, struct iovec *dvec,
378 int nvec, afs_int32 asize, int istack)
380 struct mbuf *tm, *um;
383 struct mbuf *top = 0;
384 struct mbuf *m, **mp;
392 static int before = 0;
395 AFS_STATCNT(osi_NetSend);
396 /* Actually, the Ultrix way is as good as any for us, so we don't bother with
397 * special mbufs any more. Used to think we could get away with not copying
398 * the data to the interface, but there's no way to tell the caller not to
399 * reuse the buffers after sending, so we lost out on that trick anyway */
401 if (trysblock(&asocket->so_snd)) {
407 tdata = dvec[i].iov_base;
408 tl = dvec[i].iov_len;
412 MGETHDR(m, M_DONTWAIT, MT_DATA);
414 sbunlock(&asocket->so_snd);
420 m->m_pkthdr.rcvif = NULL;
422 MGET(m, M_DONTWAIT, MT_DATA);
424 /* can't get an mbuf, give up */
426 m_freem(top); /* free mbuf list we're building */
427 sbunlock(&asocket->so_snd);
432 * WARNING: the `4 * MLEN' is somewhat dubious. It is better than
433 * `NBPG', which may have no relation to `CLBYTES'. Also, `CLBYTES'
434 * may be so large that we never use clusters, resulting in far
435 * too many mbufs being used. It is often better to briefly use
436 * a cluster, even if we are only using a portion of it. Since
437 * we are on the xmit side, it shouldn't end up sitting on a queue
438 * for a potentially unbounded time (except perhaps if we are talking
441 if (asize >= 4 * MLEN) { /* try to get cluster mbuf */
442 /* different algorithms for getting cluster mbuf */
443 MCLGET(m, M_DONTWAIT);
444 if ((m->m_flags & M_EXT) == 0)
448 /* now compute usable size */
449 len = MIN(mlen, asize);
450 /* Should I look at MAPPED_MBUFS??? */
453 len = MIN(mlen, asize);
457 top->m_pkthdr.len += len;
458 tpa = mtod(m, caddr_t);
461 memcpy(tpa, tdata, rlen);
471 /* shouldn't come here! */
472 asize = 0; /* so we make progress toward completion */
475 tdata = dvec[i].iov_base;
476 tl = dvec[i].iov_len;
488 /* setup mbuf corresponding to destination address */
489 um = m_get(M_DONTWAIT, MT_SONAME);
492 m_freem(top); /* free mbuf chain */
493 sbunlock(&asocket->so_snd);
497 memcpy(mtod(um, caddr_t), addr, sizeof(*addr));
498 addr->sin_len = um->m_len = sizeof(*addr);
499 /* note that udp_usrreq frees funny mbuf. We hold onto data, but mbuf
500 * around it is gone. */
501 /* haveGlock = ISAFS_GLOCK();
505 /* SOCKET_LOCK(asocket); */
506 /* code = (*asocket->so_proto->pr_usrreq)(asocket, PRU_SEND, tm, um, 0); */
509 Debugger("afs NetSend before");
512 (*asocket->so_proto->pr_usrreqs->pru_send) (asocket, 0, tm,
515 /* SOCKET_UNLOCK(asocket); */
519 sbunlock(&asocket->so_snd);
524 Debugger("afs NetSend busted");