diff options
| -rw-r--r-- | net/dccp/feat.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/net/dccp/feat.c b/net/dccp/feat.c index 99d7b7f9efa9..ed0851fa3cb3 100644 --- a/net/dccp/feat.c +++ b/net/dccp/feat.c @@ -14,6 +14,7 @@ #include <linux/module.h> #include "dccp.h" +#include "ccid.h" #include "feat.h" #define DCCP_FEAT_SP_NOAGREE (-123) @@ -26,6 +27,8 @@ int dccp_feat_change(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len, dccp_pr_debug("feat change type=%d feat=%d\n", type, feature); + /* XXX sanity check feat change request */ + /* check if that feature is already being negotiated */ list_for_each_entry(opt, &dp->dccps_options.dccpo_pending, dccpop_node) { @@ -62,11 +65,49 @@ int dccp_feat_change(struct sock *sk, u8 type, u8 feature, u8 *val, u8 len, EXPORT_SYMBOL_GPL(dccp_feat_change); +static int dccp_feat_update_ccid(struct sock *sk, u8 type, u8 new_ccid_nr) +{ + struct dccp_sock *dp = dccp_sk(sk); + /* figure out if we are changing our CCID or the peer's */ + const int rx = type == DCCPO_CHANGE_R; + const u8 ccid_nr = rx ? dp->dccps_options.dccpo_rx_ccid : + dp->dccps_options.dccpo_tx_ccid; + struct ccid *new_ccid; + + /* Check if nothing is being changed. */ + if (ccid_nr == new_ccid_nr) + return 0; + + new_ccid = ccid_new(new_ccid_nr, sk, rx, GFP_ATOMIC); + if (new_ccid == NULL) + return -ENOMEM; + + if (rx) { + ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk); + dp->dccps_hc_rx_ccid = new_ccid; + dp->dccps_options.dccpo_rx_ccid = new_ccid_nr; + } else { + ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk); + dp->dccps_hc_tx_ccid = new_ccid; + dp->dccps_options.dccpo_tx_ccid = new_ccid_nr; + } + + return 0; +} + /* XXX taking only u8 vals */ static int dccp_feat_update(struct sock *sk, u8 type, u8 feat, u8 val) { - /* FIXME implement */ dccp_pr_debug("changing [%d] feat %d to %d\n", type, feat, val); + + switch (feat) { + case DCCPF_CCID: + return dccp_feat_update_ccid(sk, type, val); + default: + dccp_pr_debug("IMPLEMENT changing [%d] feat %d to %d\n", + type, feat, val); + break; + } return 0; } |