6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
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17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
38 * Author: Archie Cobbs <archie@freebsd.org>
41 * $Whistle: ng_ksocket.c,v 1.1 1999/11/16 20:04:40 archie Exp $
45 * Kernel socket node type. This node type is basically a kernel-mode
46 * version of a socket... kindof like the reverse of the socket node type.
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
54 #include <sys/malloc.h>
55 #include <sys/ctype.h>
56 #include <sys/protosw.h>
57 #include <sys/errno.h>
58 #include <sys/socket.h>
59 #include <sys/socketvar.h>
63 #include <netgraph/ng_message.h>
64 #include <netgraph/netgraph.h>
65 #include <netgraph/ng_parse.h>
66 #include <netgraph/ng_ksocket.h>
68 #include <netinet/in.h>
69 #include <netatalk/at.h>
71 #ifdef NG_SEPARATE_MALLOC
72 static MALLOC_DEFINE(M_NETGRAPH_KSOCKET, "netgraph_ksock",
73 "netgraph ksock node");
75 #define M_NETGRAPH_KSOCKET M_NETGRAPH
78 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
79 #define SADATA_OFFSET (OFFSETOF(struct sockaddr, sa_data))
81 /* Node private data */
82 struct ng_ksocket_private {
86 int fn_sent; /* FN call on incoming event was sent */
87 LIST_HEAD(, ng_ksocket_private) embryos;
88 LIST_ENTRY(ng_ksocket_private) siblings;
90 u_int32_t response_token;
91 ng_ID_t response_addr;
93 typedef struct ng_ksocket_private *priv_p;
95 /* Flags for priv_p */
96 #define KSF_CONNECTING 0x00000001 /* Waiting for connection complete */
97 #define KSF_ACCEPTING 0x00000002 /* Waiting for accept complete */
98 #define KSF_EOFSEEN 0x00000004 /* Have sent 0-length EOF mbuf */
99 #define KSF_CLONED 0x00000008 /* Cloned from an accepting socket */
100 #define KSF_EMBRYONIC 0x00000010 /* Cloned node with no hooks yet */
102 /* Netgraph node methods */
103 static ng_constructor_t ng_ksocket_constructor;
104 static ng_rcvmsg_t ng_ksocket_rcvmsg;
105 static ng_shutdown_t ng_ksocket_shutdown;
106 static ng_newhook_t ng_ksocket_newhook;
107 static ng_rcvdata_t ng_ksocket_rcvdata;
108 static ng_connect_t ng_ksocket_connect;
109 static ng_disconnect_t ng_ksocket_disconnect;
111 /* Alias structure */
112 struct ng_ksocket_alias {
118 /* Protocol family aliases */
119 static const struct ng_ksocket_alias ng_ksocket_families[] = {
120 { "local", PF_LOCAL },
122 { "inet6", PF_INET6 },
123 { "atalk", PF_APPLETALK },
129 /* Socket type aliases */
130 static const struct ng_ksocket_alias ng_ksocket_types[] = {
131 { "stream", SOCK_STREAM },
132 { "dgram", SOCK_DGRAM },
135 { "seqpacket", SOCK_SEQPACKET },
139 /* Protocol aliases */
140 static const struct ng_ksocket_alias ng_ksocket_protos[] = {
141 { "ip", IPPROTO_IP, PF_INET },
142 { "raw", IPPROTO_RAW, PF_INET },
143 { "icmp", IPPROTO_ICMP, PF_INET },
144 { "igmp", IPPROTO_IGMP, PF_INET },
145 { "tcp", IPPROTO_TCP, PF_INET },
146 { "udp", IPPROTO_UDP, PF_INET },
147 { "gre", IPPROTO_GRE, PF_INET },
148 { "esp", IPPROTO_ESP, PF_INET },
149 { "ah", IPPROTO_AH, PF_INET },
150 { "swipe", IPPROTO_SWIPE, PF_INET },
151 { "encap", IPPROTO_ENCAP, PF_INET },
152 { "divert", IPPROTO_DIVERT, PF_INET },
153 { "pim", IPPROTO_PIM, PF_INET },
154 { "ddp", ATPROTO_DDP, PF_APPLETALK },
155 { "aarp", ATPROTO_AARP, PF_APPLETALK },
159 /* Helper functions */
160 static int ng_ksocket_check_accept(priv_p);
161 static void ng_ksocket_finish_accept(priv_p);
162 static int ng_ksocket_incoming(struct socket *so, void *arg, int waitflag);
163 static int ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
164 const char *s, int family);
165 static void ng_ksocket_incoming2(node_p node, hook_p hook,
166 void *arg1, int arg2);
168 /************************************************************************
169 STRUCT SOCKADDR PARSE TYPE
170 ************************************************************************/
172 /* Get the length of the data portion of a generic struct sockaddr */
174 ng_parse_generic_sockdata_getLength(const struct ng_parse_type *type,
175 const u_char *start, const u_char *buf)
177 const struct sockaddr *sa;
179 sa = (const struct sockaddr *)(buf - SADATA_OFFSET);
180 return (sa->sa_len < SADATA_OFFSET) ? 0 : sa->sa_len - SADATA_OFFSET;
183 /* Type for the variable length data portion of a generic struct sockaddr */
184 static const struct ng_parse_type ng_ksocket_generic_sockdata_type = {
185 &ng_parse_bytearray_type,
186 &ng_parse_generic_sockdata_getLength
189 /* Type for a generic struct sockaddr */
190 static const struct ng_parse_struct_field
191 ng_parse_generic_sockaddr_type_fields[] = {
192 { "len", &ng_parse_uint8_type },
193 { "family", &ng_parse_uint8_type },
194 { "data", &ng_ksocket_generic_sockdata_type },
197 static const struct ng_parse_type ng_ksocket_generic_sockaddr_type = {
198 &ng_parse_struct_type,
199 &ng_parse_generic_sockaddr_type_fields
202 /* Convert a struct sockaddr from ASCII to binary. If its a protocol
203 family that we specially handle, do that, otherwise defer to the
204 generic parse type ng_ksocket_generic_sockaddr_type. */
206 ng_ksocket_sockaddr_parse(const struct ng_parse_type *type,
207 const char *s, int *off, const u_char *const start,
208 u_char *const buf, int *buflen)
210 struct sockaddr *const sa = (struct sockaddr *)buf;
211 enum ng_parse_token tok;
216 /* If next token is a left curly brace, use generic parse type */
217 if ((tok = ng_parse_get_token(s, off, &len)) == T_LBRACE) {
218 return (*ng_ksocket_generic_sockaddr_type.supertype->parse)
219 (&ng_ksocket_generic_sockaddr_type,
220 s, off, start, buf, buflen);
223 /* Get socket address family followed by a slash */
224 while (isspace(s[*off]))
226 if ((t = index(s + *off, '/')) == NULL)
228 if ((len = t - (s + *off)) > sizeof(fambuf) - 1)
230 strncpy(fambuf, s + *off, len);
233 if ((family = ng_ksocket_parse(ng_ksocket_families, fambuf, 0)) == -1)
237 if (*buflen < SADATA_OFFSET)
239 sa->sa_family = family;
241 /* Set family-specific data and length */
242 switch (sa->sa_family) {
243 case PF_LOCAL: /* Get pathname */
245 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
246 struct sockaddr_un *const sun = (struct sockaddr_un *)sa;
250 if ((path = ng_get_string_token(s, off, &toklen, NULL)) == NULL)
252 pathlen = strlen(path);
253 if (pathlen > SOCK_MAXADDRLEN) {
254 free(path, M_NETGRAPH_KSOCKET);
257 if (*buflen < pathoff + pathlen) {
258 free(path, M_NETGRAPH_KSOCKET);
262 bcopy(path, sun->sun_path, pathlen);
263 sun->sun_len = pathoff + pathlen;
264 free(path, M_NETGRAPH_KSOCKET);
268 case PF_INET: /* Get an IP address with optional port */
270 struct sockaddr_in *const sin = (struct sockaddr_in *)sa;
273 /* Parse this: <ipaddress>[:port] */
274 for (i = 0; i < 4; i++) {
278 val = strtoul(s + *off, &eptr, 10);
279 if (val > 0xff || eptr == s + *off)
281 *off += (eptr - (s + *off));
282 ((u_char *)&sin->sin_addr)[i] = (u_char)val;
287 } else if (s[*off] == ':') {
289 val = strtoul(s + *off, &eptr, 10);
290 if (val > 0xffff || eptr == s + *off)
292 *off += (eptr - (s + *off));
293 sin->sin_port = htons(val);
297 bzero(&sin->sin_zero, sizeof(sin->sin_zero));
298 sin->sin_len = sizeof(*sin);
303 case PF_APPLETALK: /* XXX implement these someday */
313 *buflen = sa->sa_len;
317 /* Convert a struct sockaddr from binary to ASCII */
319 ng_ksocket_sockaddr_unparse(const struct ng_parse_type *type,
320 const u_char *data, int *off, char *cbuf, int cbuflen)
322 const struct sockaddr *sa = (const struct sockaddr *)(data + *off);
325 /* Output socket address, either in special or generic format */
326 switch (sa->sa_family) {
329 const int pathoff = OFFSETOF(struct sockaddr_un, sun_path);
330 const struct sockaddr_un *sun = (const struct sockaddr_un *)sa;
331 const int pathlen = sun->sun_len - pathoff;
332 char pathbuf[SOCK_MAXADDRLEN + 1];
335 bcopy(sun->sun_path, pathbuf, pathlen);
336 if ((pathtoken = ng_encode_string(pathbuf, pathlen)) == NULL)
338 slen += snprintf(cbuf, cbuflen, "local/%s", pathtoken);
339 free(pathtoken, M_NETGRAPH_KSOCKET);
342 *off += sun->sun_len;
348 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
350 slen += snprintf(cbuf, cbuflen, "inet/%d.%d.%d.%d",
351 ((const u_char *)&sin->sin_addr)[0],
352 ((const u_char *)&sin->sin_addr)[1],
353 ((const u_char *)&sin->sin_addr)[2],
354 ((const u_char *)&sin->sin_addr)[3]);
355 if (sin->sin_port != 0) {
356 slen += snprintf(cbuf + strlen(cbuf),
357 cbuflen - strlen(cbuf), ":%d",
358 (u_int)ntohs(sin->sin_port));
362 *off += sizeof(*sin);
367 case PF_APPLETALK: /* XXX implement these someday */
373 return (*ng_ksocket_generic_sockaddr_type.supertype->unparse)
374 (&ng_ksocket_generic_sockaddr_type,
375 data, off, cbuf, cbuflen);
379 /* Parse type for struct sockaddr */
380 static const struct ng_parse_type ng_ksocket_sockaddr_type = {
384 &ng_ksocket_sockaddr_parse,
385 &ng_ksocket_sockaddr_unparse,
386 NULL /* no such thing as a default struct sockaddr */
389 /************************************************************************
390 STRUCT NG_KSOCKET_SOCKOPT PARSE TYPE
391 ************************************************************************/
393 /* Get length of the struct ng_ksocket_sockopt value field, which is the
394 just the excess of the message argument portion over the length of
395 the struct ng_ksocket_sockopt. */
397 ng_parse_sockoptval_getLength(const struct ng_parse_type *type,
398 const u_char *start, const u_char *buf)
400 static const int offset = OFFSETOF(struct ng_ksocket_sockopt, value);
401 const struct ng_ksocket_sockopt *sopt;
402 const struct ng_mesg *msg;
404 sopt = (const struct ng_ksocket_sockopt *)(buf - offset);
405 msg = (const struct ng_mesg *)((const u_char *)sopt - sizeof(*msg));
406 return msg->header.arglen - sizeof(*sopt);
409 /* Parse type for the option value part of a struct ng_ksocket_sockopt
410 XXX Eventually, we should handle the different socket options specially.
411 XXX This would avoid byte order problems, eg an integer value of 1 is
412 XXX going to be "[1]" for little endian or "[3=1]" for big endian. */
413 static const struct ng_parse_type ng_ksocket_sockoptval_type = {
414 &ng_parse_bytearray_type,
415 &ng_parse_sockoptval_getLength
418 /* Parse type for struct ng_ksocket_sockopt */
419 static const struct ng_parse_struct_field ng_ksocket_sockopt_type_fields[]
420 = NG_KSOCKET_SOCKOPT_INFO(&ng_ksocket_sockoptval_type);
421 static const struct ng_parse_type ng_ksocket_sockopt_type = {
422 &ng_parse_struct_type,
423 &ng_ksocket_sockopt_type_fields
426 /* Parse type for struct ng_ksocket_accept */
427 static const struct ng_parse_struct_field ng_ksocket_accept_type_fields[]
428 = NGM_KSOCKET_ACCEPT_INFO;
429 static const struct ng_parse_type ng_ksocket_accept_type = {
430 &ng_parse_struct_type,
431 &ng_ksocket_accept_type_fields
434 /* List of commands and how to convert arguments to/from ASCII */
435 static const struct ng_cmdlist ng_ksocket_cmds[] = {
440 &ng_ksocket_sockaddr_type,
447 &ng_parse_int32_type,
455 &ng_ksocket_accept_type
461 &ng_ksocket_sockaddr_type,
469 &ng_ksocket_sockaddr_type
473 NGM_KSOCKET_GETPEERNAME,
476 &ng_ksocket_sockaddr_type
482 &ng_ksocket_sockopt_type,
489 &ng_ksocket_sockopt_type,
490 &ng_ksocket_sockopt_type
495 /* Node type descriptor */
496 static struct ng_type ng_ksocket_typestruct = {
497 .version = NG_ABI_VERSION,
498 .name = NG_KSOCKET_NODE_TYPE,
499 .constructor = ng_ksocket_constructor,
500 .rcvmsg = ng_ksocket_rcvmsg,
501 .shutdown = ng_ksocket_shutdown,
502 .newhook = ng_ksocket_newhook,
503 .connect = ng_ksocket_connect,
504 .rcvdata = ng_ksocket_rcvdata,
505 .disconnect = ng_ksocket_disconnect,
506 .cmdlist = ng_ksocket_cmds,
508 NETGRAPH_INIT(ksocket, &ng_ksocket_typestruct);
510 #define ERROUT(x) do { error = (x); goto done; } while (0)
512 /************************************************************************
514 ************************************************************************/
517 * Node type constructor
518 * The NODE part is assumed to be all set up.
519 * There is already a reference to the node for us.
522 ng_ksocket_constructor(node_p node)
526 /* Allocate private structure */
527 priv = malloc(sizeof(*priv), M_NETGRAPH_KSOCKET, M_WAITOK | M_ZERO);
529 LIST_INIT(&priv->embryos);
530 /* cross link them */
532 NG_NODE_SET_PRIVATE(node, priv);
539 * Give our OK for a hook to be added. The hook name is of the
540 * form "<family>/<type>/<proto>" where the three components may
541 * be decimal numbers or else aliases from the above lists.
543 * Connecting a hook amounts to opening the socket. Disconnecting
544 * the hook closes the socket and destroys the node as well.
547 ng_ksocket_newhook(node_p node, hook_p hook, const char *name0)
549 struct thread *td = curthread; /* XXX broken */
550 const priv_p priv = NG_NODE_PRIVATE(node);
551 char *s1, *s2, name[NG_HOOKSIZ];
552 int family, type, protocol, error;
554 /* Check if we're already connected */
555 if (priv->hook != NULL)
558 if (priv->flags & KSF_CLONED) {
559 if (priv->flags & KSF_EMBRYONIC) {
560 /* Remove ourselves from our parent's embryo list */
561 LIST_REMOVE(priv, siblings);
562 priv->flags &= ~KSF_EMBRYONIC;
565 /* Extract family, type, and protocol from hook name */
566 snprintf(name, sizeof(name), "%s", name0);
568 if ((s2 = index(s1, '/')) == NULL)
571 family = ng_ksocket_parse(ng_ksocket_families, s1, 0);
575 if ((s2 = index(s1, '/')) == NULL)
578 type = ng_ksocket_parse(ng_ksocket_types, s1, 0);
582 protocol = ng_ksocket_parse(ng_ksocket_protos, s1, family);
586 /* Create the socket */
587 error = socreate(family, &priv->so, type, protocol,
592 /* XXX call soreserve() ? */
600 * In case of misconfigured routing a packet may reenter
601 * ksocket node recursively. Decouple stack to avoid possible
602 * panics about sleeping with locks held.
604 NG_HOOK_FORCE_QUEUE(hook);
610 ng_ksocket_connect(hook_p hook)
612 node_p node = NG_HOOK_NODE(hook);
613 const priv_p priv = NG_NODE_PRIVATE(node);
614 struct socket *const so = priv->so;
616 /* Add our hook for incoming data and other events */
617 SOCKBUF_LOCK(&priv->so->so_rcv);
618 soupcall_set(priv->so, SO_RCV, ng_ksocket_incoming, node);
619 SOCKBUF_UNLOCK(&priv->so->so_rcv);
620 SOCKBUF_LOCK(&priv->so->so_snd);
621 soupcall_set(priv->so, SO_SND, ng_ksocket_incoming, node);
622 SOCKBUF_UNLOCK(&priv->so->so_snd);
624 priv->so->so_state |= SS_NBIO;
625 SOCK_UNLOCK(priv->so);
627 * --Original comment--
628 * On a cloned socket we may have already received one or more
629 * upcalls which we couldn't handle without a hook. Handle
631 * We cannot call the upcall function directly
632 * from here, because until this function has returned our
633 * hook isn't connected.
635 * ---meta comment for -current ---
636 * XXX This is dubius.
637 * Upcalls between the time that the hook was
638 * first created and now (on another processesor) will
639 * be earlier on the queue than the request to finalise the hook.
640 * By the time the hook is finalised,
641 * The queued upcalls will have happenned and the code
642 * will have discarded them because of a lack of a hook.
645 * This is a bad byproduct of the complicated way in which hooks
646 * are now created (3 daisy chained async events).
648 * Since we are a netgraph operation
649 * We know that we hold a lock on this node. This forces the
650 * request we make below to be queued rather than implemented
651 * immediatly which will cause the upcall function to be called a bit
653 * However, as we will run any waiting queued operations immediatly
654 * after doing this one, if we have not finalised the other end
655 * of the hook, those queued operations will fail.
657 if (priv->flags & KSF_CLONED) {
658 ng_send_fn(node, NULL, &ng_ksocket_incoming2, so, M_NOWAIT);
665 * Receive a control message
668 ng_ksocket_rcvmsg(node_p node, item_p item, hook_p lasthook)
670 struct thread *td = curthread; /* XXX broken */
671 const priv_p priv = NG_NODE_PRIVATE(node);
672 struct socket *const so = priv->so;
673 struct ng_mesg *resp = NULL;
678 NGI_GET_MSG(item, msg);
679 switch (msg->header.typecookie) {
680 case NGM_KSOCKET_COOKIE:
681 switch (msg->header.cmd) {
682 case NGM_KSOCKET_BIND:
684 struct sockaddr *const sa
685 = (struct sockaddr *)msg->data;
688 if (msg->header.arglen < SADATA_OFFSET
689 || msg->header.arglen < sa->sa_len)
695 error = sobind(so, sa, td);
698 case NGM_KSOCKET_LISTEN:
701 if (msg->header.arglen != sizeof(int32_t))
707 error = solisten(so, *((int32_t *)msg->data), td);
711 case NGM_KSOCKET_ACCEPT:
714 if (msg->header.arglen != 0)
719 /* Make sure the socket is capable of accepting */
720 if (!(so->so_options & SO_ACCEPTCONN))
722 if (priv->flags & KSF_ACCEPTING)
725 error = ng_ksocket_check_accept(priv);
726 if (error != 0 && error != EWOULDBLOCK)
730 * If a connection is already complete, take it.
731 * Otherwise let the upcall function deal with
732 * the connection when it comes in.
734 priv->response_token = msg->header.token;
735 raddr = priv->response_addr = NGI_RETADDR(item);
737 ng_ksocket_finish_accept(priv);
739 priv->flags |= KSF_ACCEPTING;
743 case NGM_KSOCKET_CONNECT:
745 struct sockaddr *const sa
746 = (struct sockaddr *)msg->data;
749 if (msg->header.arglen < SADATA_OFFSET
750 || msg->header.arglen < sa->sa_len)
756 if ((so->so_state & SS_ISCONNECTING) != 0)
758 if ((error = soconnect(so, sa, td)) != 0) {
759 so->so_state &= ~SS_ISCONNECTING;
762 if ((so->so_state & SS_ISCONNECTING) != 0) {
763 /* We will notify the sender when we connect */
764 priv->response_token = msg->header.token;
765 raddr = priv->response_addr = NGI_RETADDR(item);
766 priv->flags |= KSF_CONNECTING;
772 case NGM_KSOCKET_GETNAME:
773 case NGM_KSOCKET_GETPEERNAME:
775 int (*func)(struct socket *so, struct sockaddr **nam);
776 struct sockaddr *sa = NULL;
780 if (msg->header.arglen != 0)
786 if (msg->header.cmd == NGM_KSOCKET_GETPEERNAME) {
788 & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
790 func = so->so_proto->pr_usrreqs->pru_peeraddr;
792 func = so->so_proto->pr_usrreqs->pru_sockaddr;
794 /* Get local or peer address */
795 if ((error = (*func)(so, &sa)) != 0)
797 len = (sa == NULL) ? 0 : sa->sa_len;
799 /* Send it back in a response */
800 NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
805 bcopy(sa, resp->data, len);
814 case NGM_KSOCKET_GETOPT:
816 struct ng_ksocket_sockopt *ksopt =
817 (struct ng_ksocket_sockopt *)msg->data;
821 if (msg->header.arglen != sizeof(*ksopt))
826 /* Get response with room for option value */
827 NG_MKRESPONSE(resp, msg, sizeof(*ksopt)
828 + NG_KSOCKET_MAX_OPTLEN, M_NOWAIT);
832 /* Get socket option, and put value in the response */
833 sopt.sopt_dir = SOPT_GET;
834 sopt.sopt_level = ksopt->level;
835 sopt.sopt_name = ksopt->name;
837 sopt.sopt_valsize = NG_KSOCKET_MAX_OPTLEN;
838 ksopt = (struct ng_ksocket_sockopt *)resp->data;
839 sopt.sopt_val = ksopt->value;
840 if ((error = sogetopt(so, &sopt)) != 0) {
845 /* Set actual value length */
846 resp->header.arglen = sizeof(*ksopt)
851 case NGM_KSOCKET_SETOPT:
853 struct ng_ksocket_sockopt *const ksopt =
854 (struct ng_ksocket_sockopt *)msg->data;
855 const int valsize = msg->header.arglen - sizeof(*ksopt);
864 /* Set socket option */
865 sopt.sopt_dir = SOPT_SET;
866 sopt.sopt_level = ksopt->level;
867 sopt.sopt_name = ksopt->name;
868 sopt.sopt_val = ksopt->value;
869 sopt.sopt_valsize = valsize;
871 error = sosetopt(so, &sopt);
885 NG_RESPOND_MSG(error, node, item, resp);
891 * Receive incoming data on our hook. Send it out the socket.
894 ng_ksocket_rcvdata(hook_p hook, item_p item)
896 struct thread *td = curthread; /* XXX broken */
897 const node_p node = NG_HOOK_NODE(hook);
898 const priv_p priv = NG_NODE_PRIVATE(node);
899 struct socket *const so = priv->so;
900 struct sockaddr *sa = NULL;
903 #ifdef ALIGNED_POINTER
905 #endif /* ALIGNED_POINTER */
911 #ifdef ALIGNED_POINTER
912 if (!ALIGNED_POINTER(mtod(m, caddr_t), uint32_t)) {
913 n = m_defrag(m, M_NOWAIT);
920 #endif /* ALIGNED_POINTER */
922 * Look if socket address is stored in packet tags.
923 * If sockaddr is ours, or provided by a third party (zero id),
926 if (((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
927 NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL) &&
928 (stag->id == NG_NODE_ID(node) || stag->id == 0))
931 /* Reset specific mbuf flags to prevent addressing problems. */
932 m->m_flags &= ~(M_BCAST|M_MCAST);
935 error = sosend(so, sa, 0, m, 0, 0, td);
944 ng_ksocket_shutdown(node_p node)
946 const priv_p priv = NG_NODE_PRIVATE(node);
949 /* Close our socket (if any) */
950 if (priv->so != NULL) {
951 SOCKBUF_LOCK(&priv->so->so_rcv);
952 soupcall_clear(priv->so, SO_RCV);
953 SOCKBUF_UNLOCK(&priv->so->so_rcv);
954 SOCKBUF_LOCK(&priv->so->so_snd);
955 soupcall_clear(priv->so, SO_SND);
956 SOCKBUF_UNLOCK(&priv->so->so_snd);
961 /* If we are an embryo, take ourselves out of the parent's list */
962 if (priv->flags & KSF_EMBRYONIC) {
963 LIST_REMOVE(priv, siblings);
964 priv->flags &= ~KSF_EMBRYONIC;
967 /* Remove any embryonic children we have */
968 while (!LIST_EMPTY(&priv->embryos)) {
969 embryo = LIST_FIRST(&priv->embryos);
970 ng_rmnode_self(embryo->node);
973 /* Take down netgraph node */
974 bzero(priv, sizeof(*priv));
975 free(priv, M_NETGRAPH_KSOCKET);
976 NG_NODE_SET_PRIVATE(node, NULL);
977 NG_NODE_UNREF(node); /* let the node escape */
985 ng_ksocket_disconnect(hook_p hook)
987 KASSERT(NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0,
988 ("%s: numhooks=%d?", __func__,
989 NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook))));
990 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
991 ng_rmnode_self(NG_HOOK_NODE(hook));
995 /************************************************************************
997 ************************************************************************/
999 * You should not "just call" a netgraph node function from an external
1000 * asynchronous event. This is because in doing so you are ignoring the
1001 * locking on the netgraph nodes. Instead call your function via ng_send_fn().
1002 * This will call the function you chose, but will first do all the
1003 * locking rigmarole. Your function MAY only be called at some distant future
1004 * time (several millisecs away) so don't give it any arguments
1005 * that may be revoked soon (e.g. on your stack).
1007 * To decouple stack, we use queue version of ng_send_fn().
1011 ng_ksocket_incoming(struct socket *so, void *arg, int waitflag)
1013 const node_p node = arg;
1014 const priv_p priv = NG_NODE_PRIVATE(node);
1015 int wait = ((waitflag & M_WAITOK) ? NG_WAITOK : 0) | NG_QUEUE;
1018 * Even if node is not locked, as soon as we are called, we assume
1019 * it exist and it's private area is valid. With some care we can
1020 * access it. Mark node that incoming event for it was sent to
1021 * avoid unneded queue trashing.
1023 if (atomic_cmpset_int(&priv->fn_sent, 0, 1) &&
1024 ng_send_fn1(node, NULL, &ng_ksocket_incoming2, so, 0, wait)) {
1025 atomic_store_rel_int(&priv->fn_sent, 0);
1032 * When incoming data is appended to the socket, we get notified here.
1033 * This is also called whenever a significant event occurs for the socket.
1034 * Our original caller may have queued this even some time ago and
1035 * we cannot trust that he even still exists. The node however is being
1036 * held with a reference by the queueing code and guarantied to be valid.
1039 ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int arg2)
1041 struct socket *so = arg1;
1042 const priv_p priv = NG_NODE_PRIVATE(node);
1044 struct ng_mesg *response;
1046 int s, flags, error;
1050 /* so = priv->so; *//* XXX could have derived this like so */
1051 KASSERT(so == priv->so, ("%s: wrong socket", __func__));
1053 /* Allow next incoming event to be queued. */
1054 atomic_store_rel_int(&priv->fn_sent, 0);
1056 /* Check whether a pending connect operation has completed */
1057 if (priv->flags & KSF_CONNECTING) {
1058 if ((error = so->so_error) != 0) {
1060 so->so_state &= ~SS_ISCONNECTING;
1062 if (!(so->so_state & SS_ISCONNECTING)) {
1063 NG_MKMESSAGE(response, NGM_KSOCKET_COOKIE,
1064 NGM_KSOCKET_CONNECT, sizeof(int32_t), M_NOWAIT);
1065 if (response != NULL) {
1066 response->header.flags |= NGF_RESP;
1067 response->header.token = priv->response_token;
1068 *(int32_t *)response->data = error;
1070 * send an async "response" message
1071 * to the node that set us up
1072 * (if it still exists)
1074 NG_SEND_MSG_ID(error, node,
1075 response, priv->response_addr, 0);
1077 priv->flags &= ~KSF_CONNECTING;
1081 /* Check whether a pending accept operation has completed */
1082 if (priv->flags & KSF_ACCEPTING) {
1083 error = ng_ksocket_check_accept(priv);
1084 if (error != EWOULDBLOCK)
1085 priv->flags &= ~KSF_ACCEPTING;
1087 ng_ksocket_finish_accept(priv);
1091 * If we don't have a hook, we must handle data events later. When
1092 * the hook gets created and is connected, this upcall function
1093 * will be called again.
1095 if (priv->hook == NULL) {
1100 /* Read and forward available mbuf's */
1102 auio.uio_resid = 1000000000;
1103 flags = MSG_DONTWAIT;
1105 struct sockaddr *sa = NULL;
1108 /* Try to get next packet from socket */
1109 if ((error = soreceive(so, (so->so_state & SS_ISCONNECTED) ?
1110 NULL : &sa, &auio, &m, (struct mbuf **)0, &flags)) != 0)
1113 /* See if we got anything */
1121 * Don't trust the various socket layers to get the
1122 * packet header and length correct (e.g. kern/15175).
1124 * Also, do not trust that soreceive() will clear m_nextpkt
1125 * for us (e.g. kern/84952, kern/82413).
1127 m->m_pkthdr.csum_flags = 0;
1128 for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next) {
1129 m->m_pkthdr.len += n->m_len;
1130 n->m_nextpkt = NULL;
1133 /* Put peer's socket address (if any) into a tag */
1135 struct sa_tag *stag;
1137 stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
1138 NG_KSOCKET_TAG_SOCKADDR, sizeof(ng_ID_t) +
1139 sa->sa_len, M_NOWAIT);
1144 bcopy(sa, &stag->sa, sa->sa_len);
1146 stag->id = NG_NODE_ID(node);
1147 m_tag_prepend(m, &stag->tag);
1150 sendit: /* Forward data with optional peer sockaddr as packet tag */
1151 NG_SEND_DATA_ONLY(error, priv->hook, m);
1155 * If the peer has closed the connection, forward a 0-length mbuf
1156 * to indicate end-of-file.
1158 if (so->so_rcv.sb_state & SBS_CANTRCVMORE && !(priv->flags & KSF_EOFSEEN)) {
1159 MGETHDR(m, M_NOWAIT, MT_DATA);
1161 m->m_len = m->m_pkthdr.len = 0;
1162 NG_SEND_DATA_ONLY(error, priv->hook, m);
1164 priv->flags |= KSF_EOFSEEN;
1170 * Check for a completed incoming connection and return 0 if one is found.
1171 * Otherwise return the appropriate error code.
1174 ng_ksocket_check_accept(priv_p priv)
1176 struct socket *const head = priv->so;
1179 if ((error = head->so_error) != 0) {
1183 /* Unlocked read. */
1184 if (TAILQ_EMPTY(&head->so_comp)) {
1185 if (head->so_rcv.sb_state & SBS_CANTRCVMORE)
1186 return ECONNABORTED;
1193 * Handle the first completed incoming connection, assumed to be already
1194 * on the socket's so_comp queue.
1197 ng_ksocket_finish_accept(priv_p priv)
1199 struct socket *const head = priv->so;
1201 struct sockaddr *sa = NULL;
1202 struct ng_mesg *resp;
1203 struct ng_ksocket_accept *resp_data;
1210 so = TAILQ_FIRST(&head->so_comp);
1211 if (so == NULL) { /* Should never happen */
1215 TAILQ_REMOVE(&head->so_comp, so, so_list);
1217 so->so_qstate &= ~SQ_COMP;
1221 so->so_state |= SS_NBIO;
1225 /* XXX KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); */
1229 len = OFFSETOF(struct ng_ksocket_accept, addr);
1233 NG_MKMESSAGE(resp, NGM_KSOCKET_COOKIE, NGM_KSOCKET_ACCEPT, len,
1239 resp->header.flags |= NGF_RESP;
1240 resp->header.token = priv->response_token;
1242 /* Clone a ksocket node to wrap the new socket */
1243 error = ng_make_node_common(&ng_ksocket_typestruct, &node);
1245 free(resp, M_NETGRAPH);
1250 if (ng_ksocket_constructor(node) != 0) {
1251 NG_NODE_UNREF(node);
1252 free(resp, M_NETGRAPH);
1257 priv2 = NG_NODE_PRIVATE(node);
1259 priv2->flags |= KSF_CLONED | KSF_EMBRYONIC;
1262 * Insert the cloned node into a list of embryonic children
1263 * on the parent node. When a hook is created on the cloned
1264 * node it will be removed from this list. When the parent
1265 * is destroyed it will destroy any embryonic children it has.
1267 LIST_INSERT_HEAD(&priv->embryos, priv2, siblings);
1269 SOCKBUF_LOCK(&so->so_rcv);
1270 soupcall_set(so, SO_RCV, ng_ksocket_incoming, node);
1271 SOCKBUF_UNLOCK(&so->so_rcv);
1272 SOCKBUF_LOCK(&so->so_snd);
1273 soupcall_set(so, SO_SND, ng_ksocket_incoming, node);
1274 SOCKBUF_UNLOCK(&so->so_snd);
1276 /* Fill in the response data and send it or return it to the caller */
1277 resp_data = (struct ng_ksocket_accept *)resp->data;
1278 resp_data->nodeid = NG_NODE_ID(node);
1280 bcopy(sa, &resp_data->addr, sa->sa_len);
1281 NG_SEND_MSG_ID(error, node, resp, priv->response_addr, 0);
1289 * Parse out either an integer value or an alias.
1292 ng_ksocket_parse(const struct ng_ksocket_alias *aliases,
1293 const char *s, int family)
1299 for (k = 0; aliases[k].name != NULL; k++) {
1300 if (strcmp(s, aliases[k].name) == 0
1301 && aliases[k].family == family)
1302 return aliases[k].value;
1305 /* Try parsing as a number */
1306 val = (int)strtoul(s, &eptr, 10);
1307 if (val < 0 || *eptr != '\0')