fragmentation: Rename "frag_off" field to "frag"

[secnet.git] / slip.c

diff --git a/slip.c b/slip.c
index 5eb8dbdb1239e72698eb52d0f53d108af2e2f607..aed2551de70d2d695ec1ef99e04081923227dabf 100644 (file)
--- a/slip.c
+++ b/slip.c
@@ -79,6 +79,9 @@ static void slip_unstuff(struct slip *st, uint8_t *buf, uint32_t l)
        int outputchr;
        enum { OUTPUT_END = 256, OUTPUT_NOTHING = 257 };
 
+       if (!st->buff->size)
+           buffer_init(st->buff,calculate_max_start_pad());
+
        if (st->pending_esc) {
            st->pending_esc=False;
            switch(buf[i]) {
@@ -115,7 +118,7 @@ static void slip_unstuff(struct slip *st, uint8_t *buf, uint32_t l)
        if (st->ignoring_packet) {
            if (outputchr == OUTPUT_END) {
                st->ignoring_packet=False;
-               buffer_init(st->buff,calculate_max_start_pad());
+               st->buff->size=0;
            }
        } else {
            if (outputchr == OUTPUT_END) {
@@ -123,7 +126,7 @@ static void slip_unstuff(struct slip *st, uint8_t *buf, uint32_t l)
                    st->netlink_to_tunnel(&st->nl,st->buff);
                    BUF_ALLOC(st->buff,"userv_afterpoll");
                }
-               buffer_init(st->buff,calculate_max_start_pad());
+               st->buff->size=0;
            } else if (outputchr != OUTPUT_NOTHING) {
                if (st->buff->size < st->buff->len) {
                    buf_append_uint8(st->buff,outputchr);
@@ -210,6 +213,14 @@ static void userv_deliver_to_kernel(void *sst, struct buffer_if *buf)
 {
     struct userv *st=sst;
 
+    if (buf->size > st->slip.nl.mtu) {
+       Message(M_ERR,"%s: packet of size %"PRIu32" exceeds mtu %"PRIu32":"
+               " cannot be injected into kernel, dropped\n",
+               st->slip.nl.name, buf->size, st->slip.nl.mtu);
+       BUF_FREE(buf);
+       return;
+    }
+
     slip_stuff(&st->slip,buf,st->txfd);
 }