[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/libbb/udp_io.c b/ap/app/busybox/src/libbb/udp_io.c
new file mode 100644
index 0000000..7985a97
--- /dev/null
+++ b/ap/app/busybox/src/libbb/udp_io.c
@@ -0,0 +1,179 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2007 Denys Vlasenko
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+#include "libbb.h"
+
+/*
+ * This asks kernel to let us know dst addr/port of incoming packets
+ * We don't check for errors here. Not supported == won't be used
+ */
+void FAST_FUNC
+socket_want_pktinfo(int fd UNUSED_PARAM)
+{
+#ifdef IP_PKTINFO
+ setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &const_int_1, sizeof(int));
+#endif
+#if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
+ setsockopt(fd, IPPROTO_IPV6, IPV6_PKTINFO, &const_int_1, sizeof(int));
+#endif
+}
+
+
+ssize_t FAST_FUNC
+send_to_from(int fd, void *buf, size_t len, int flags,
+ const struct sockaddr *to,
+ const struct sockaddr *from,
+ socklen_t tolen)
+{
+#ifndef IP_PKTINFO
+ (void)from; /* suppress "unused from" warning */
+ return sendto(fd, buf, len, flags, to, tolen);
+#else
+ struct iovec iov[1];
+ struct msghdr msg;
+ union {
+ char cmsg[CMSG_SPACE(sizeof(struct in_pktinfo))];
+# if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
+ char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+# endif
+ } u;
+ struct cmsghdr* cmsgptr;
+
+ if (from->sa_family != AF_INET
+# if ENABLE_FEATURE_IPV6
+ && from->sa_family != AF_INET6
+# endif
+ ) {
+ /* ANY local address */
+ return sendto(fd, buf, len, flags, to, tolen);
+ }
+
+ /* man recvmsg and man cmsg is needed to make sense of code below */
+
+ iov[0].iov_base = buf;
+ iov[0].iov_len = len;
+
+ memset(&u, 0, sizeof(u));
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = (void *)(struct sockaddr *)to; /* or compiler will annoy us */
+ msg.msg_namelen = tolen;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &u;
+ msg.msg_controllen = sizeof(u);
+ msg.msg_flags = flags;
+
+ cmsgptr = CMSG_FIRSTHDR(&msg);
+ if (to->sa_family == AF_INET && from->sa_family == AF_INET) {
+ struct in_pktinfo *pktptr;
+ cmsgptr->cmsg_level = IPPROTO_IP;
+ cmsgptr->cmsg_type = IP_PKTINFO;
+ cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
+ pktptr = (struct in_pktinfo *)(CMSG_DATA(cmsgptr));
+ /*pktptr->ipi_ifindex = 0; -- already done by memset(u...) */
+ /* In general, CMSG_DATA() can be unaligned, but in this case
+ * we know for sure it is sufficiently aligned:
+ * CMSG_FIRSTHDR simply returns &u above,
+ * and CMSG_DATA returns &u + size_t + int + int.
+ * Thus direct assignment is ok:
+ */
+ pktptr->ipi_spec_dst = ((struct sockaddr_in*)from)->sin_addr;
+ }
+# if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
+ else if (to->sa_family == AF_INET6 && from->sa_family == AF_INET6) {
+ struct in6_pktinfo *pktptr;
+ cmsgptr->cmsg_level = IPPROTO_IPV6;
+ cmsgptr->cmsg_type = IPV6_PKTINFO;
+ cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+ pktptr = (struct in6_pktinfo *)(CMSG_DATA(cmsgptr));
+ /* pktptr->ipi6_ifindex = 0; -- already done by memset(u...) */
+ pktptr->ipi6_addr = ((struct sockaddr_in6*)from)->sin6_addr;
+ }
+# endif
+ msg.msg_controllen = cmsgptr->cmsg_len;
+
+ return sendmsg(fd, &msg, flags);
+#endif
+}
+
+/* NB: this will never set port# in 'to'!
+ * _Only_ IP/IPv6 address part of 'to' is _maybe_ modified.
+ * Typical usage is to preinit 'to' with "default" value
+ * before calling recv_from_to(). */
+ssize_t FAST_FUNC
+recv_from_to(int fd, void *buf, size_t len, int flags,
+ struct sockaddr *from, struct sockaddr *to,
+ socklen_t sa_size)
+{
+#ifndef IP_PKTINFO
+ (void)to; /* suppress "unused to" warning */
+ return recvfrom(fd, buf, len, flags, from, &sa_size);
+#else
+ /* man recvmsg and man cmsg is needed to make sense of code below */
+ struct iovec iov[1];
+ union {
+ char cmsg[CMSG_SPACE(sizeof(struct in_pktinfo))];
+# if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
+ char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+# endif
+ } u;
+ struct cmsghdr *cmsgptr;
+ struct msghdr msg;
+ ssize_t recv_length;
+
+ iov[0].iov_base = buf;
+ iov[0].iov_len = len;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_name = (struct sockaddr *)from;
+ msg.msg_namelen = sa_size;
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &u;
+ msg.msg_controllen = sizeof(u);
+
+ recv_length = recvmsg(fd, &msg, flags);
+ if (recv_length < 0)
+ return recv_length;
+
+# define to4 ((struct sockaddr_in*)to)
+# define to6 ((struct sockaddr_in6*)to)
+ /* Here we try to retrieve destination IP and memorize it */
+ for (cmsgptr = CMSG_FIRSTHDR(&msg);
+ cmsgptr != NULL;
+ cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)
+ ) {
+ if (cmsgptr->cmsg_level == IPPROTO_IP
+ && cmsgptr->cmsg_type == IP_PKTINFO
+ ) {
+ const int IPI_ADDR_OFF = offsetof(struct in_pktinfo, ipi_addr);
+ to->sa_family = AF_INET;
+ /*# define pktinfo(cmsgptr) ( (struct in_pktinfo*)(CMSG_DATA(cmsgptr)) )*/
+ /*to4->sin_addr = pktinfo(cmsgptr)->ipi_addr; - may be unaligned */
+ memcpy(&to4->sin_addr, (char*)(CMSG_DATA(cmsgptr)) + IPI_ADDR_OFF, sizeof(to4->sin_addr));
+ /*to4->sin_port = 123; - this data is not supplied by kernel */
+ break;
+ }
+# if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
+ if (cmsgptr->cmsg_level == IPPROTO_IPV6
+ && cmsgptr->cmsg_type == IPV6_PKTINFO
+ ) {
+ const int IPI6_ADDR_OFF = offsetof(struct in6_pktinfo, ipi6_addr);
+ to->sa_family = AF_INET6;
+ /*# define pktinfo(cmsgptr) ( (struct in6_pktinfo*)(CMSG_DATA(cmsgptr)) )*/
+ /*to6->sin6_addr = pktinfo(cmsgptr)->ipi6_addr; - may be unaligned */
+ memcpy(&to6->sin6_addr, (char*)(CMSG_DATA(cmsgptr)) + IPI6_ADDR_OFF, sizeof(to6->sin6_addr));
+ /*to6->sin6_port = 123; */
+ break;
+ }
+# endif
+ }
+ return recv_length;
+#endif
+}