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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2010-09-19 22:06:50 +0400
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2010-09-21 14:14:25 +0400
commit4874c131d79695e3d372042781a408a1a8a762d8 (patch)
treee3c6bf89f191b47e019f063d16c3e5d6c4fc0623 /net/dccp/ccids
parent462fb2af9788a82a534f8184abfde31574e1cfa0 (diff)
downloadlinux-4874c131d79695e3d372042781a408a1a8a762d8.tar.xz
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/ccids')
-rw-r--r--net/dccp/ccids/ccid3.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index ce8059130070..be1b8baaf298 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -481,9 +481,8 @@ done_computing_x:
jiffies + usecs_to_jiffies(t_nfb));
}
-static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
- unsigned char len, u16 idx,
- unsigned char *value)
+static int ccid3_hc_tx_parse_options(struct sock *sk, u8 packet_type,
+ u8 option, u8 *optval, u8 optlen)
{
struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv = &hc->tx_options_received;
@@ -492,12 +491,15 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
switch (option) {
case TFRC_OPT_RECEIVE_RATE:
case TFRC_OPT_LOSS_EVENT_RATE:
- if (unlikely(len != 4)) {
+ /* Must be ignored on Data packets, cf. RFC 4342 8.3 and 8.5 */
+ if (packet_type == DCCP_PKT_DATA)
+ break;
+ if (unlikely(optlen != 4)) {
DCCP_WARN("%s(%p), invalid len %d for %u\n",
- dccp_role(sk), sk, len, option);
+ dccp_role(sk), sk, optlen, option);
return -EINVAL;
}
- opt_val = ntohl(get_unaligned((__be32 *)value));
+ opt_val = ntohl(get_unaligned((__be32 *)optval));
if (option == TFRC_OPT_RECEIVE_RATE) {
opt_recv->ccid3or_receive_rate = opt_val;