/*
* Receive data
*/
static int
ng_vjc_rcvdata(hook_p hook, item_p item)
{
const node_p node = NG_HOOK_NODE(hook);
const priv_p priv = NG_NODE_PRIVATE(node);
int error = 0;
struct mbuf *m;
NGI_GET_M(item, m);
if (hook == priv->ip) { /* outgoing packet */
u_int type = TYPE_IP;
/* Compress packet if enabled and proto is TCP */
if (priv->conf.enableComp) {
struct ip *ip;
if ((m = ng_vjc_pulluphdrs(m, 0)) == NULL) {
NG_FREE_ITEM(item);
return (ENOBUFS);
}
ip = mtod(m, struct ip *);
if (ip->ip_p == IPPROTO_TCP) {
const int origLen = m->m_len;
type = sl_compress_tcp(m, ip,
&priv->slc, priv->conf.compressCID);
m->m_pkthdr.len += m->m_len - origLen;
}
}
/* Dispatch to the appropriate outgoing hook */
switch (type) {
case TYPE_IP:
hook = priv->vjip;
break;
case TYPE_UNCOMPRESSED_TCP:
hook = priv->vjuncomp;
break;
case TYPE_COMPRESSED_TCP:
hook = priv->vjcomp;
break;
default:
panic("%s: type=%d", __func__, type);
}
} else if (hook == priv->vjcomp) { /* incoming compressed packet */
static struct mbuf *
vj_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp, int pri,
u_short *proto)
{
int type;
struct ip *pip;
u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16;
bp = m_pullup(bp);
pip = (struct ip *)MBUF_CTOP(bp);
if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP &&
cproto == PROTO_VJCOMP) {
type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc,
&bundle->ncp.ipcp.vj.slstat,
bundle->ncp.ipcp.peer_compproto & 0xff);
log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type);
switch (type) {
case TYPE_IP:
break;
case TYPE_UNCOMPRESSED_TCP:
*proto = PROTO_VJUNCOMP;
log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
m_settype(bp, MB_VJOUT);
break;
case TYPE_COMPRESSED_TCP:
*proto = PROTO_VJCOMP;
log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
m_settype(bp, MB_VJOUT);
break;
default:
log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type);
m_freem(bp);
return NULL;
}
}
return bp;
}
/*
* Get a packet to send. This procedure is intended to be called at
* splsoftnet, since it may involve time-consuming operations such as
* applying VJ compression, packet compression, address/control and/or
* protocol field compression to the packet.
*/
struct mbuf *
ppp_dequeue(struct ppp_softc *sc)
{
struct mbuf *m, *mp;
u_char *cp;
int address, control, protocol;
/*
* Grab a packet to send: first try the fast queue, then the
* normal queue.
*/
IF_DEQUEUE(&sc->sc_fastq, m);
if (m == NULL)
m = ifsq_dequeue(ifq_get_subq_default(&sc->sc_if.if_snd));
if (m == NULL)
return NULL;
++sc->sc_stats.ppp_opackets;
/*
* Extract the ppp header of the new packet.
* The ppp header will be in one mbuf.
*/
cp = mtod(m, u_char *);
address = PPP_ADDRESS(cp);
control = PPP_CONTROL(cp);
protocol = PPP_PROTOCOL(cp);
switch (protocol) {
case PPP_IP:
#ifdef VJC
/*
* If the packet is a TCP/IP packet, see if we can compress it.
*/
if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
struct ip *ip;
int type;
mp = m;
ip = (struct ip *) (cp + PPP_HDRLEN);
if (mp->m_len <= PPP_HDRLEN) {
mp = mp->m_next;
if (mp == NULL)
break;
ip = mtod(mp, struct ip *);
}
/* this code assumes the IP/TCP header is in one non-shared mbuf */
if (ip->ip_p == IPPROTO_TCP) {
type = sl_compress_tcp(mp, ip, sc->sc_comp,
!(sc->sc_flags & SC_NO_TCP_CCID));
switch (type) {
case TYPE_UNCOMPRESSED_TCP:
protocol = PPP_VJC_UNCOMP;
break;
case TYPE_COMPRESSED_TCP:
protocol = PPP_VJC_COMP;
cp = mtod(m, u_char *);
cp[0] = address; /* header has moved */
cp[1] = control;
cp[2] = 0;
break;
}
cp[3] = protocol; /* update protocol in PPP header */
}
}
