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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2010-09-19 20:06:50 +0200 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2010-09-21 12:14:25 +0200 |
| commit | 4874c131d79695e3d372042781a408a1a8a762d8 (patch) | |
| tree | e3c6bf89f191b47e019f063d16c3e5d6c4fc0623 /net/dccp/ccids | |
| parent | bridge : Sanitize skb before it enters the IP stack (diff) | |
| download | linux-4874c131d79695e3d372042781a408a1a8a762d8.tar.xz linux-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/ccids')
| -rw-r--r-- | net/dccp/ccids/ccid3.c | 14 |
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; |