aboutsummaryrefslogtreecommitdiffstats
path: root/slirp-android/if.c
diff options
context:
space:
mode:
Diffstat (limited to 'slirp-android/if.c')
-rw-r--r--slirp-android/if.c296
1 files changed, 296 insertions, 0 deletions
diff --git a/slirp-android/if.c b/slirp-android/if.c
new file mode 100644
index 0000000..60d5b58
--- /dev/null
+++ b/slirp-android/if.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright (c) 1995 Danny Gasparovski.
+ *
+ * Please read the file COPYRIGHT for the
+ * terms and conditions of the copyright.
+ */
+
+#include <slirp.h>
+
+int if_queued = 0; /* Number of packets queued so far */
+
+struct mbuf if_fastq; /* fast queue (for interactive data) */
+struct mbuf if_batchq; /* queue for non-interactive data */
+struct mbuf *next_m; /* Pointer to next mbuf to output */
+
+#define ifs_init(ifm) ((ifm)->ifs_next = (ifm)->ifs_prev = (ifm))
+
+static void
+ifs_insque(struct mbuf *ifm, struct mbuf *ifmhead)
+{
+ ifm->ifs_next = ifmhead->ifs_next;
+ ifmhead->ifs_next = ifm;
+ ifm->ifs_prev = ifmhead;
+ ifm->ifs_next->ifs_prev = ifm;
+}
+
+static void
+ifs_remque(struct mbuf *ifm)
+{
+ ifm->ifs_prev->ifs_next = ifm->ifs_next;
+ ifm->ifs_next->ifs_prev = ifm->ifs_prev;
+}
+
+void
+if_init(void)
+{
+ if_fastq.ifq_next = if_fastq.ifq_prev = &if_fastq;
+ if_batchq.ifq_next = if_batchq.ifq_prev = &if_batchq;
+ // sl_compress_init(&comp_s);
+ next_m = &if_batchq;
+}
+
+#if 0
+/*
+ * This shouldn't be needed since the modem is blocking and
+ * we don't expect any signals, but what the hell..
+ */
+inline int
+writen(fd, bptr, n)
+ int fd;
+ char *bptr;
+ int n;
+{
+ int ret;
+ int total;
+
+ /* This should succeed most of the time */
+ ret = socket_send(fd, bptr, n);
+ if (ret == n || ret <= 0)
+ return ret;
+
+ /* Didn't write everything, go into the loop */
+ total = ret;
+ while (n > total) {
+ ret = socket_send(fd, bptr+total, n-total);
+ if (ret <= 0)
+ return ret;
+ total += ret;
+ }
+ return total;
+}
+
+/*
+ * if_input - read() the tty, do "top level" processing (ie: check for any escapes),
+ * and pass onto (*ttyp->if_input)
+ *
+ * XXXXX Any zeros arriving by themselves are NOT placed into the arriving packet.
+ */
+#define INBUFF_SIZE 2048 /* XXX */
+void
+if_input(ttyp)
+ struct ttys *ttyp;
+{
+ u_char if_inbuff[INBUFF_SIZE];
+ int if_n;
+
+ DEBUG_CALL("if_input");
+ DEBUG_ARG("ttyp = %lx", (long)ttyp);
+
+ if_n = socket_recv(ttyp->fd, (char *)if_inbuff, INBUFF_SIZE);
+
+ DEBUG_MISC((dfd, " read %d bytes\n", if_n));
+
+ if (if_n <= 0) {
+ if (if_n == 0 || (errno != EINTR && errno != EAGAIN)) {
+ if (ttyp->up)
+ link_up--;
+ tty_detached(ttyp, 0);
+ }
+ return;
+ }
+ if (if_n == 1) {
+ if (*if_inbuff == '0') {
+ ttyp->ones = 0;
+ if (++ttyp->zeros >= 5)
+ slirp_exit(0);
+ return;
+ }
+ if (*if_inbuff == '1') {
+ ttyp->zeros = 0;
+ if (++ttyp->ones >= 5)
+ tty_detached(ttyp, 0);
+ return;
+ }
+ }
+ ttyp->ones = ttyp->zeros = 0;
+
+ (*ttyp->if_input)(ttyp, if_inbuff, if_n);
+}
+#endif
+
+/*
+ * if_output: Queue packet into an output queue.
+ * There are 2 output queue's, if_fastq and if_batchq.
+ * Each output queue is a doubly linked list of double linked lists
+ * of mbufs, each list belonging to one "session" (socket). This
+ * way, we can output packets fairly by sending one packet from each
+ * session, instead of all the packets from one session, then all packets
+ * from the next session, etc. Packets on the if_fastq get absolute
+ * priority, but if one session hogs the link, it gets "downgraded"
+ * to the batchq until it runs out of packets, then it'll return
+ * to the fastq (eg. if the user does an ls -alR in a telnet session,
+ * it'll temporarily get downgraded to the batchq)
+ */
+void
+if_output(struct socket *so, struct mbuf *ifm)
+{
+ struct mbuf *ifq;
+ int on_fastq = 1;
+
+ DEBUG_CALL("if_output");
+ DEBUG_ARG("so = %lx", (long)so);
+ DEBUG_ARG("ifm = %lx", (long)ifm);
+
+ /*
+ * First remove the mbuf from m_usedlist,
+ * since we're gonna use m_next and m_prev ourselves
+ * XXX Shouldn't need this, gotta change dtom() etc.
+ */
+ if (ifm->m_flags & M_USEDLIST) {
+ remque(ifm);
+ ifm->m_flags &= ~M_USEDLIST;
+ }
+
+ /*
+ * See if there's already a batchq list for this session.
+ * This can include an interactive session, which should go on fastq,
+ * but gets too greedy... hence it'll be downgraded from fastq to batchq.
+ * We mustn't put this packet back on the fastq (or we'll send it out of order)
+ * XXX add cache here?
+ */
+ for (ifq = if_batchq.ifq_prev; ifq != &if_batchq; ifq = ifq->ifq_prev) {
+ if (so == ifq->ifq_so) {
+ /* A match! */
+ ifm->ifq_so = so;
+ ifs_insque(ifm, ifq->ifs_prev);
+ goto diddit;
+ }
+ }
+
+ /* No match, check which queue to put it on */
+ if (so && (so->so_iptos & IPTOS_LOWDELAY)) {
+ ifq = if_fastq.ifq_prev;
+ on_fastq = 1;
+ /*
+ * Check if this packet is a part of the last
+ * packet's session
+ */
+ if (ifq->ifq_so == so) {
+ ifm->ifq_so = so;
+ ifs_insque(ifm, ifq->ifs_prev);
+ goto diddit;
+ }
+ } else
+ ifq = if_batchq.ifq_prev;
+
+ /* Create a new doubly linked list for this session */
+ ifm->ifq_so = so;
+ ifs_init(ifm);
+ insque(ifm, ifq);
+
+diddit:
+ ++if_queued;
+
+ if (so) {
+ /* Update *_queued */
+ so->so_queued++;
+ so->so_nqueued++;
+ /*
+ * Check if the interactive session should be downgraded to
+ * the batchq. A session is downgraded if it has queued 6
+ * packets without pausing, and at least 3 of those packets
+ * have been sent over the link
+ * (XXX These are arbitrary numbers, probably not optimal..)
+ */
+ if (on_fastq && ((so->so_nqueued >= 6) &&
+ (so->so_nqueued - so->so_queued) >= 3)) {
+
+ /* Remove from current queue... */
+ remque(ifm->ifs_next);
+
+ /* ...And insert in the new. That'll teach ya! */
+ insque(ifm->ifs_next, &if_batchq);
+ }
+ }
+
+#ifndef FULL_BOLT
+ /*
+ * This prevents us from malloc()ing too many mbufs
+ */
+ if (link_up) {
+ /* if_start will check towrite */
+ if_start();
+ }
+#endif
+}
+
+/*
+ * Send a packet
+ * We choose a packet based on it's position in the output queues;
+ * If there are packets on the fastq, they are sent FIFO, before
+ * everything else. Otherwise we choose the first packet from the
+ * batchq and send it. the next packet chosen will be from the session
+ * after this one, then the session after that one, and so on.. So,
+ * for example, if there are 3 ftp session's fighting for bandwidth,
+ * one packet will be sent from the first session, then one packet
+ * from the second session, then one packet from the third, then back
+ * to the first, etc. etc.
+ */
+void
+if_start(void)
+{
+ struct mbuf *ifm, *ifqt;
+
+ DEBUG_CALL("if_start");
+
+ if (if_queued == 0)
+ return; /* Nothing to do */
+
+ again:
+ /* check if we can really output */
+ if (!slirp_can_output())
+ return;
+
+ /*
+ * See which queue to get next packet from
+ * If there's something in the fastq, select it immediately
+ */
+ if (if_fastq.ifq_next != &if_fastq) {
+ ifm = if_fastq.ifq_next;
+ } else {
+ /* Nothing on fastq, see if next_m is valid */
+ if (next_m != &if_batchq)
+ ifm = next_m;
+ else
+ ifm = if_batchq.ifq_next;
+
+ /* Set which packet to send on next iteration */
+ next_m = ifm->ifq_next;
+ }
+ /* Remove it from the queue */
+ ifqt = ifm->ifq_prev;
+ remque(ifm);
+ --if_queued;
+
+ /* If there are more packets for this session, re-queue them */
+ if (ifm->ifs_next != /* ifm->ifs_prev != */ ifm) {
+ insque(ifm->ifs_next, ifqt);
+ ifs_remque(ifm);
+ }
+
+ /* Update so_queued */
+ if (ifm->ifq_so) {
+ if (--ifm->ifq_so->so_queued == 0)
+ /* If there's no more queued, reset nqueued */
+ ifm->ifq_so->so_nqueued = 0;
+ }
+
+ /* Encapsulate the packet for sending */
+ if_encap((uint8_t *)ifm->m_data, ifm->m_len);
+
+ m_free(ifm);
+
+ if (if_queued)
+ goto again;
+}