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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2010-09-19 20:06:50 +0200
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2010-09-21 12:14:25 +0200
commit4874c131d79695e3d372042781a408a1a8a762d8 (patch)
treee3c6bf89f191b47e019f063d16c3e5d6c4fc0623 /net/dccp/ccid.h
parentbridge : Sanitize skb before it enters the IP stack (diff)
downloadlinux-dev-4874c131d79695e3d372042781a408a1a8a762d8.tar.xz
linux-dev-4874c131d79695e3d372042781a408a1a8a762d8.zip
dccp: Add packet type information to CCID-specific option parsing
This 1. adds packet type information to ccid_hc_{rx,tx}_parse_options(). This is necessary, since table 3 in RFC 4340, 5.8 leaves it to the CCIDs to state which options may (not) appear on what packet type. 2. adds such a check for CCID-3's {Loss Event, Receive} Rate as specified in RFC 4340 8.3 ("Receive Rate options MUST NOT be sent on DCCP-Data packets") and 8.5 ("Loss Event Rate options MUST NOT be sent on DCCP-Data packets"). 3. removes an unused argument `idx' from ccid_hc_{rx,tx}_parse_options(). This is also no longer necessary, since the CCID-specific option-parsing routines are passed every single parameter of the type-length-value option encoding. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'net/dccp/ccid.h')
-rw-r--r--net/dccp/ccid.h46
1 files changed, 23 insertions, 23 deletions
diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index 6df6f8ac9636..6d16a9070ff0 100644
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -62,18 +62,14 @@ struct ccid_operations {
void (*ccid_hc_tx_exit)(struct sock *sk);
void (*ccid_hc_rx_packet_recv)(struct sock *sk,
struct sk_buff *skb);
- int (*ccid_hc_rx_parse_options)(struct sock *sk,
- unsigned char option,
- unsigned char len, u16 idx,
- unsigned char* value);
+ int (*ccid_hc_rx_parse_options)(struct sock *sk, u8 pkt,
+ u8 opt, u8 *val, u8 len);
int (*ccid_hc_rx_insert_options)(struct sock *sk,
struct sk_buff *skb);
void (*ccid_hc_tx_packet_recv)(struct sock *sk,
struct sk_buff *skb);
- int (*ccid_hc_tx_parse_options)(struct sock *sk,
- unsigned char option,
- unsigned char len, u16 idx,
- unsigned char* value);
+ int (*ccid_hc_tx_parse_options)(struct sock *sk, u8 pkt,
+ u8 opt, u8 *val, u8 len);
int (*ccid_hc_tx_send_packet)(struct sock *sk,
struct sk_buff *skb);
void (*ccid_hc_tx_packet_sent)(struct sock *sk,
@@ -168,27 +164,31 @@ static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk,
ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb);
}
+/**
+ * ccid_hc_tx_parse_options - Parse CCID-specific options sent by the receiver
+ * @pkt: type of packet that @opt appears on (RFC 4340, 5.1)
+ * @opt: the CCID-specific option type (RFC 4340, 5.8 and 10.3)
+ * @val: value of @opt
+ * @len: length of @val in bytes
+ */
static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk,
- unsigned char option,
- unsigned char len, u16 idx,
- unsigned char* value)
+ u8 pkt, u8 opt, u8 *val, u8 len)
{
- int rc = 0;
- if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL)
- rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx,
- value);
- return rc;
+ if (ccid->ccid_ops->ccid_hc_tx_parse_options == NULL)
+ return 0;
+ return ccid->ccid_ops->ccid_hc_tx_parse_options(sk, pkt, opt, val, len);
}
+/**
+ * ccid_hc_rx_parse_options - Parse CCID-specific options sent by the sender
+ * Arguments are analogous to ccid_hc_tx_parse_options()
+ */
static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk,
- unsigned char option,
- unsigned char len, u16 idx,
- unsigned char* value)
+ u8 pkt, u8 opt, u8 *val, u8 len)
{
- int rc = 0;
- if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL)
- rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value);
- return rc;
+ if (ccid->ccid_ops->ccid_hc_rx_parse_options == NULL)
+ return 0;
+ return ccid->ccid_ops->ccid_hc_rx_parse_options(sk, pkt, opt, val, len);
}
static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk,