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nl80211: add packet offset information for wowlan pattern

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If user knows the location of a wowlan pattern to be matched in
Rx packet, he can provide an offset with the pattern. This will
help drivers to ignore initial bytes and match the pattern
efficiently.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
[refactor pattern sending]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Amitkumar Karwar 2013-02-12 12:16:26 -08:00 committed by Johannes Berg
parent 66d5757051
commit bb92d19983
3 changed files with 60 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
include/net/cfg80211.h
View file

@ -1576,6 +1576,7 @@ struct cfg80211_pmksa {
* one bit per byte, in same format as nl80211
* @pattern: bytes to match where bitmask is 1
* @pattern_len: length of pattern (in bytes)
* @pkt_offset: packet offset (in bytes)
*
* Internal note: @mask and @pattern are allocated in one chunk of
* memory, free @mask only!
@ -1583,6 +1584,7 @@ struct cfg80211_pmksa {
struct cfg80211_wowlan_trig_pkt_pattern {
u8 *mask, *pattern;
int pattern_len;
int pkt_offset;
};
/**
@ -2290,12 +2292,14 @@ enum wiphy_wowlan_support_flags {
* (see nl80211.h for the pattern definition)
* @pattern_max_len: maximum length of each pattern
* @pattern_min_len: minimum length of each pattern
* @max_pkt_offset: maximum Rx packet offset
*/
struct wiphy_wowlan_support {
u32 flags;
int n_patterns;
int pattern_max_len;
int pattern_min_len;
int max_pkt_offset;
};
/**

12
include/uapi/linux/nl80211.h
View file

@ -2910,6 +2910,8 @@ enum nl80211_tx_power_setting {
* Note that the pattern matching is done as though frames were not
* 802.11 frames but 802.3 frames, i.e. the frame is fully unpacked
* first (including SNAP header unpacking) and then matched.
* @NL80211_WOWLAN_PKTPAT_OFFSET: packet offset, pattern is matched after
* these fixed number of bytes of received packet
* @NUM_NL80211_WOWLAN_PKTPAT: number of attributes
* @MAX_NL80211_WOWLAN_PKTPAT: max attribute number
*/
@ -2917,6 +2919,7 @@ enum nl80211_wowlan_packet_pattern_attr {
__NL80211_WOWLAN_PKTPAT_INVALID,
NL80211_WOWLAN_PKTPAT_MASK,
NL80211_WOWLAN_PKTPAT_PATTERN,
NL80211_WOWLAN_PKTPAT_OFFSET,
NUM_NL80211_WOWLAN_PKTPAT,
MAX_NL80211_WOWLAN_PKTPAT = NUM_NL80211_WOWLAN_PKTPAT - 1,
@ -2927,6 +2930,7 @@ enum nl80211_wowlan_packet_pattern_attr {
* @max_patterns: maximum number of patterns supported
* @min_pattern_len: minimum length of each pattern
* @max_pattern_len: maximum length of each pattern
* @max_pkt_offset: maximum Rx packet offset
*
* This struct is carried in %NL80211_WOWLAN_TRIG_PKT_PATTERN when
* that is part of %NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED in the
@ -2936,6 +2940,7 @@ struct nl80211_wowlan_pattern_support {
__u32 max_patterns;
__u32 min_pattern_len;
__u32 max_pattern_len;
__u32 max_pkt_offset;
} __attribute__((packed));
/**
@ -2951,9 +2956,10 @@ struct nl80211_wowlan_pattern_support {
* @NL80211_WOWLAN_TRIG_PKT_PATTERN: wake up on the specified packet patterns
* which are passed in an array of nested attributes, each nested attribute
* defining a with attributes from &struct nl80211_wowlan_trig_pkt_pattern.
* Each pattern defines a wakeup packet. The matching is done on the MSDU,
* i.e. as though the packet was an 802.3 packet, so the pattern matching
* is done after the packet is converted to the MSDU.
* Each pattern defines a wakeup packet. Packet offset is associated with
* each pattern which is used while matching the pattern. The matching is
* done on the MSDU, i.e. as though the packet was an 802.3 packet, so the
* pattern matching is done after the packet is converted to the MSDU.
*
* In %NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED, it is a binary attribute
* carrying a &struct nl80211_wowlan_pattern_support.

74
net/wireless/nl80211.c
View file

@ -1238,6 +1238,8 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 portid, u32 seq, int flag
dev->wiphy.wowlan.pattern_min_len,
.max_pattern_len =
dev->wiphy.wowlan.pattern_max_len,
.max_pkt_offset =
dev->wiphy.wowlan.max_pkt_offset,
};
if (nla_put(msg, NL80211_WOWLAN_TRIG_PKT_PATTERN,
sizeof(pat), &pat))
@ -6895,6 +6897,39 @@ static int nl80211_leave_mesh(struct sk_buff *skb, struct genl_info *info)
}
#ifdef CONFIG_PM
static int nl80211_send_wowlan_patterns(struct sk_buff *msg,
struct cfg80211_registered_device *rdev)
{
struct nlattr *nl_pats, *nl_pat;
int i, pat_len;
if (!rdev->wowlan->n_patterns)
return 0;
nl_pats = nla_nest_start(msg, NL80211_WOWLAN_TRIG_PKT_PATTERN);
if (!nl_pats)
return -ENOBUFS;
for (i = 0; i < rdev->wowlan->n_patterns; i++) {
nl_pat = nla_nest_start(msg, i + 1);
if (!nl_pat)
return -ENOBUFS;
pat_len = rdev->wowlan->patterns[i].pattern_len;
if (nla_put(msg, NL80211_WOWLAN_PKTPAT_MASK,
DIV_ROUND_UP(pat_len, 8),
rdev->wowlan->patterns[i].mask) ||
nla_put(msg, NL80211_WOWLAN_PKTPAT_PATTERN,
pat_len, rdev->wowlan->patterns[i].pattern) ||
nla_put_u32(msg, NL80211_WOWLAN_PKTPAT_OFFSET,
rdev->wowlan->patterns[i].pkt_offset))
return -ENOBUFS;
nla_nest_end(msg, nl_pat);
}
nla_nest_end(msg, nl_pats);
return 0;
}
static int nl80211_get_wowlan(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
@ -6935,32 +6970,8 @@ static int nl80211_get_wowlan(struct sk_buff *skb, struct genl_info *info)
(rdev->wowlan->rfkill_release &&
nla_put_flag(msg, NL80211_WOWLAN_TRIG_RFKILL_RELEASE)))
goto nla_put_failure;
if (rdev->wowlan->n_patterns) {
struct nlattr *nl_pats, *nl_pat;
int i, pat_len;
nl_pats = nla_nest_start(msg,
NL80211_WOWLAN_TRIG_PKT_PATTERN);
if (!nl_pats)
goto nla_put_failure;
for (i = 0; i < rdev->wowlan->n_patterns; i++) {
nl_pat = nla_nest_start(msg, i + 1);
if (!nl_pat)
goto nla_put_failure;
pat_len = rdev->wowlan->patterns[i].pattern_len;
if (nla_put(msg, NL80211_WOWLAN_PKTPAT_MASK,
DIV_ROUND_UP(pat_len, 8),
rdev->wowlan->patterns[i].mask) ||
nla_put(msg, NL80211_WOWLAN_PKTPAT_PATTERN,
pat_len,
rdev->wowlan->patterns[i].pattern))
goto nla_put_failure;
nla_nest_end(msg, nl_pat);
}
nla_nest_end(msg, nl_pats);
}
if (nl80211_send_wowlan_patterns(msg, rdev))
goto nla_put_failure;
nla_nest_end(msg, nl_wowlan);
}
@ -7046,7 +7057,7 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
if (tb[NL80211_WOWLAN_TRIG_PKT_PATTERN]) {
struct nlattr *pat;
int n_patterns = 0;
int rem, pat_len, mask_len;
int rem, pat_len, mask_len, pkt_offset;
struct nlattr *pat_tb[NUM_NL80211_WOWLAN_PKTPAT];
nla_for_each_nested(pat, tb[NL80211_WOWLAN_TRIG_PKT_PATTERN],
@ -7081,6 +7092,15 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
pat_len < wowlan->pattern_min_len)
goto error;
if (!pat_tb[NL80211_WOWLAN_PKTPAT_OFFSET])
pkt_offset = 0;
else
pkt_offset = nla_get_u32(
pat_tb[NL80211_WOWLAN_PKTPAT_OFFSET]);
if (pkt_offset > wowlan->max_pkt_offset)
goto error;
new_triggers.patterns[i].pkt_offset = pkt_offset;
new_triggers.patterns[i].mask =
kmalloc(mask_len + pat_len, GFP_KERNEL);
if (!new_triggers.patterns[i].mask) {