2 * swift implementation of syscall API>
4 * Simulates the classic socket syscalls (socket, bind, send, recv).
5 * Implementation uses raw sockets (AF_INET, SOCK_RAW).
7 * Subsequently, implementation is to be ported into kernel space and
8 * the interface is going to be offered by the Linux syscall API.
10 * Heavily inspired by GLIBC's <sys/socket.h>
11 * (/usr/include/sys/socket.h).
13 * 2011, Razvan Deaconescu, razvan.deaconescu@cs.pub.ro
19 #include <sys/types.h>
20 #include <sys/socket.h>
21 #include <netinet/in.h>
25 #include "swift_types.h"
26 #include "swift_raw.h"
35 /* socket management structure */
38 struct sockaddr_sw addr;
39 enum sock_rw_state rw_state;
40 struct sock_list *next;
41 struct sock_list *prev;
44 static struct sock_list sock_list_head = {
45 .next = &sock_list_head,
46 .prev = &sock_list_head
50 * Add new socket to list. Called by sw_socket "syscall".
53 static struct sock_list *list_add_socket(int s)
55 struct sock_list *ptr = malloc(sizeof(*ptr));
59 ptr->next = &sock_list_head;
60 ptr->prev = sock_list_head.prev;
61 sock_list_head.prev->next = ptr;
62 sock_list_head.prev = ptr;
69 * Bind socket to given address. Called by sw_bind "syscall".
72 static struct sock_list *list_update_socket_address(int s, __CONST_SOCKADDR_ARG addr)
74 struct sock_list *ptr;
76 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
78 memcpy(&ptr->addr, addr, sizeof(ptr->addr));
86 * Get list element containing socket s. Called by sw_send* "syscalls".
89 static struct sock_list *list_elem_from_socket(int s)
91 struct sock_list *ptr;
93 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
102 * Get list element containing address addr. Called by sw_bind "syscall".
105 static struct sock_list *list_elem_from_address(__CONST_SOCKADDR_ARG addr)
107 struct sock_list *ptr;
109 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
110 if (memcmp(&ptr->addr, addr, sizeof(addr)) == 0)
117 * Remove socket from list. Called by sw_close "syscall".
120 static struct sock_list *list_unlink_socket(int s)
122 struct sock_list *ptr;
124 for (ptr = sock_list_head.next; ptr != &sock_list_head; ptr = ptr->next)
126 ptr->next->prev = ptr->prev;
127 ptr->prev->next = ptr->next;
137 * Create a new socket of type TYPE in domain DOMAIN, using
138 * protocol PROTOCOL. If PROTOCOL is zero, one is chosen automatically.
139 * Returns a file descriptor for the new socket, or -1 for errors.
141 * swift: PROTOCOL is IPPROTO_SWIFT. Ignore TYPE.
143 int sw_socket (int __domain, int __type, int __protocol)
146 struct sock_list *list;
148 s = socket(__domain, SOCK_RAW, IPPROTO_SWIFT);
152 list = list_add_socket(s);
156 /* Socket is fully open. */
157 list->rw_state = STATE_NO_SHUT;
168 * Give the socket FD the local address ADDR (which is LEN bytes long).
170 * swift: ADDR is of type struct sockaddr_sw.
172 int sw_bind (int __fd, __CONST_SOCKADDR_ARG __addr, socklen_t __len)
174 struct sock_list *list;
176 /* Check whether address is already in use. */
177 list = list_elem_from_address(__addr);
182 /* Update __fd entry in socket management list. */
183 list = list_update_socket_address(__fd, __addr);
186 goto list_update_err;
196 /* Put the local address of FD into *ADDR and its length in *LEN. */
197 int sw_getsockname (int __fd, __SOCKADDR_ARG __addr,
198 socklen_t *__restrict __len)
206 * Send N bytes of BUF on socket FD to peer at address ADDR (which is
207 * ADDR_LEN bytes long). Returns the number sent, or -1 for errors.
209 * This function is a cancellation point and therefore not marked with
212 ssize_t sw_sendto (int __fd, __const void *__buf, size_t __n,
213 int __flags, __CONST_SOCKADDR_ARG __addr,
214 socklen_t __addr_len)
224 * Read N bytes into BUF through socket FD.
225 * If ADDR is not NULL, fill in *ADDR_LEN bytes of it with tha address of
226 * the sender, and store the actual size of the address in *ADDR_LEN.
227 * Returns the number of bytes read or -1 for errors.
229 * This function is a cancellation point and therefore not marked with
232 ssize_t sw_recvfrom (int __fd, void *__restrict __buf, size_t __n,
233 int __flags, __SOCKADDR_ARG __addr,
234 socklen_t *__restrict __addr_len)
244 * Send a message described MESSAGE on socket FD.
245 * Returns the number of bytes sent, or -1 for errors.
247 * This function is a cancellation point and therefore not marked with
250 ssize_t sw_sendmsg (int __fd, __const struct msghdr *__message,
261 * Receive a message as described by MESSAGE from socket FD.
262 * Returns the number of bytes read or -1 for errors.
264 * This function is a cancellation point and therefore not marked with
267 ssize_t sw_recvmsg (int __fd, struct msghdr *__message, int __flags)
277 * Put the current value for socket FD's option OPTNAME at protocol level
278 * LEVEL into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the
279 * value's actual length. Returns 0 on success, -1 for errors.
281 int sw_getsockopt (int __fd, int __level, int __optname,
282 void *__restrict __optval,
283 socklen_t *__restrict __optlen)
285 /* Call classical interface of getsockopt(2). */
286 return getsockopt(__fd, __level, __optname, __optval, __optlen);
290 * Set socket FD's option OPTNAME at protocol level LEVEL
291 * to *OPTVAL (which is OPTLEN bytes long).
292 * Returns 0 on success, -1 for errors.
295 int sw_setsockopt (int __fd, int __level, int __optname,
296 __const void *__optval, socklen_t __optlen)
298 /* Call classical interface of setsockopt(2). */
299 return setsockopt(__fd, __level, __optname, __optval, __optlen);
303 * Shut down all or part of the connection open on socket FD.
304 * HOW determines what to shut down:
305 * SHUT_RD = No more receptions;
306 * SHUT_WR = No more transmissions;
307 * SHUT_RDWR = No more receptions or transmissions.
308 * Returns 0 on success, -1 for errors.
310 int sw_shutdown (int __fd, int __how)
312 struct sock_list *list;
314 /* Find socket in management structure. */
315 list = list_elem_from_socket(__fd);
321 /* Check and update socket state. */
322 if (__how == STATE_SHUT_RDWR)
323 list->rw_state = STATE_SHUT_RDWR;
324 else if (__how == STATE_SHUT_WR) {
325 if (list->rw_state == STATE_SHUT_RD)
326 list->rw_state = STATE_SHUT_RDWR;
327 else if (list->rw_state == STATE_SHUT_WR) {
332 else if (__how == STATE_SHUT_RD) {
333 if (list->rw_state == STATE_SHUT_WR)
334 list->rw_state = STATE_SHUT_RDWR;
335 else if (list->rw_state == STATE_SHUT_RD) {
341 /* Remove socket from socket management structure. */
342 if (list->rw_state == STATE_SHUT_RDWR) {
343 list = list_unlink_socket(__fd);
346 goto list_unlink_err;
350 /* Call classical interface of shutdown(2). */
351 return shutdown(__fd, __how);