Differential D4077 Diff 9928 sys/net80211/ieee80211_output.c

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sys/net80211/ieee80211_output.c

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* Drivers and cipher modules assume we have done the necessary work		* Drivers and cipher modules assume we have done the necessary work
* and fail rudely if they don't find the space they need.		* and fail rudely if they don't find the space they need.
*/		*/
struct mbuf *		struct mbuf *
ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,		ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
struct ieee80211_key key, struct mbuf m)		struct ieee80211_key key, struct mbuf m)
{		{
#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))		#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
int needed_space = vap->iv_ic->ic_headroom + hdrsize;		struct ieee80211com *ic = vap->iv_ic;
		int needed_space = ic->ic_headroom + hdrsize;
		int reserved_space;

if (key != NULL) {		if (key != NULL) {
/* XXX belongs in crypto code? */		/* XXX belongs in crypto code? */
needed_space += key->wk_cipher->ic_header;		needed_space += key->wk_cipher->ic_header;
/* XXX frags */		/* XXX frags */
/*		/*
* When crypto is being done in the host we must insure		* When crypto is being done in the host we must insure
* the data are writable for the cipher routines; clone		* the data are writable for the cipher routines; clone
Show All 14 Lines	#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
* We know we are called just before stripping an Ethernet		* We know we are called just before stripping an Ethernet
* header and prepending an LLC header. This means we know		* header and prepending an LLC header. This means we know
* there will be		* there will be
* sizeof(struct ether_header) - sizeof(struct llc)		* sizeof(struct ether_header) - sizeof(struct llc)
* bytes recovered to which we need additional space for the		* bytes recovered to which we need additional space for the
* 802.11 header and any crypto header.		* 802.11 header and any crypto header.
*/		*/
/* XXX check trailing space and copy instead? */		/* XXX check trailing space and copy instead? */
if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {		reserved_space = needed_space - TO_BE_RECLAIMED;
		if (M_LEADINGSPACE(m) < reserved_space) {
struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);		struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
if (n == NULL) {		if (n == NULL) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,		IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
"%s: cannot expand storage\n", __func__);		"%s: cannot expand storage\n", __func__);
vap->iv_stats.is_tx_nobuf++;		vap->iv_stats.is_tx_nobuf++;
m_freem(m);		m_freem(m);
return NULL;		return NULL;
}		}
Show All 20 Lines	if (M_LEADINGSPACE(m) < reserved_space) {
m->m_len -= sizeof(struct ether_header);		m->m_len -= sizeof(struct ether_header);
m->m_data += sizeof(struct ether_header);		m->m_data += sizeof(struct ether_header);
/*		/*
* Replace the head of the chain.		* Replace the head of the chain.
*/		*/
n->m_next = m;		n->m_next = m;
m = n;		m = n;
}		}

		if (ic->ic_seglimit != 0) {
		/* Adjust length of the mbuf chain. */
		m = ieee80211_mbuf_defrag(m, reserved_space, ic->ic_seglimit);
		if (m == NULL) {
		vap->iv_stats.is_tx_nobuf++;
		return NULL;
		}
		}

return m;		return m;
#undef TO_BE_RECLAIMED		#undef TO_BE_RECLAIMED
}		}

/*		/*
* Return the transmit key to use in sending a unicast frame.		* Return the transmit key to use in sending a unicast frame.
* If a unicast key is set we use that. When no unicast key is set		* If a unicast key is set we use that. When no unicast key is set
* we fall back to the default transmit key.		* we fall back to the default transmit key.
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