dccp: Implement lookup table for feature-negotiation information
A lookup table for feature-negotiation information, extracted from RFC 4340/42, is provided by this patch. All currently known features can be found in this table, along with their feature location, their default value, and type. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -176,19 +176,20 @@ enum {
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};
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/* DCCP features (RFC 4340 section 6.4) */
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enum {
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enum dccp_feature_numbers {
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DCCPF_RESERVED = 0,
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DCCPF_CCID = 1,
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DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */
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DCCPF_SHORT_SEQNOS = 2,
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DCCPF_SEQUENCE_WINDOW = 3,
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DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */
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DCCPF_ECN_INCAPABLE = 4,
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DCCPF_ACK_RATIO = 5,
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DCCPF_SEND_ACK_VECTOR = 6,
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DCCPF_SEND_NDP_COUNT = 7,
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DCCPF_MIN_CSUM_COVER = 8,
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DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */
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DCCPF_DATA_CHECKSUM = 9,
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/* 10-127 reserved */
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DCCPF_MIN_CCID_SPECIFIC = 128,
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DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
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DCCPF_MAX_CCID_SPECIFIC = 255,
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};
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@ -23,6 +23,43 @@
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#define DCCP_FEAT_SP_NOAGREE (-123)
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static const struct {
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u8 feat_num; /* DCCPF_xxx */
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enum dccp_feat_type rxtx; /* RX or TX */
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enum dccp_feat_type reconciliation; /* SP or NN */
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u8 default_value; /* as in 6.4 */
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/*
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* Lookup table for location and type of features (from RFC 4340/4342)
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* +--------------------------+----+-----+----+----+---------+-----------+
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* | Feature | Location | Reconc. | Initial | Section |
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* | | RX | TX | SP | NN | Value | Reference |
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* +--------------------------+----+-----+----+----+---------+-----------+
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* | DCCPF_CCID | | X | X | | 2 | 10 |
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* | DCCPF_SHORT_SEQNOS | | X | X | | 0 | 7.6.1 |
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* | DCCPF_SEQUENCE_WINDOW | | X | | X | 100 | 7.5.2 |
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* | DCCPF_ECN_INCAPABLE | X | | X | | 0 | 12.1 |
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* | DCCPF_ACK_RATIO | | X | | X | 2 | 11.3 |
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* | DCCPF_SEND_ACK_VECTOR | X | | X | | 0 | 11.5 |
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* | DCCPF_SEND_NDP_COUNT | | X | X | | 0 | 7.7.2 |
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* | DCCPF_MIN_CSUM_COVER | X | | X | | 0 | 9.2.1 |
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* | DCCPF_DATA_CHECKSUM | X | | X | | 0 | 9.3.1 |
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* | DCCPF_SEND_LEV_RATE | X | | X | | 0 | 4342/8.4 |
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* +--------------------------+----+-----+----+----+---------+-----------+
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*/
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} dccp_feat_table[] = {
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{ DCCPF_CCID, FEAT_AT_TX, FEAT_SP, 2 },
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{ DCCPF_SHORT_SEQNOS, FEAT_AT_TX, FEAT_SP, 0 },
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{ DCCPF_SEQUENCE_WINDOW, FEAT_AT_TX, FEAT_NN, 100 },
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{ DCCPF_ECN_INCAPABLE, FEAT_AT_RX, FEAT_SP, 0 },
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{ DCCPF_ACK_RATIO, FEAT_AT_TX, FEAT_NN, 2 },
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{ DCCPF_SEND_ACK_VECTOR, FEAT_AT_RX, FEAT_SP, 0 },
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{ DCCPF_SEND_NDP_COUNT, FEAT_AT_TX, FEAT_SP, 0 },
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{ DCCPF_MIN_CSUM_COVER, FEAT_AT_RX, FEAT_SP, 0 },
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{ DCCPF_DATA_CHECKSUM, FEAT_AT_RX, FEAT_SP, 0 },
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{ DCCPF_SEND_LEV_RATE, FEAT_AT_RX, FEAT_SP, 0 },
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};
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#define DCCP_FEAT_SUPPORTED_MAX ARRAY_SIZE(dccp_feat_table)
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int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
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u8 *val, u8 len, gfp_t gfp)
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{
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@ -639,6 +676,8 @@ const char *dccp_feat_name(const u8 feat)
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if (feat > DCCPF_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC)
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return feature_names[DCCPF_RESERVED];
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if (feat == DCCPF_SEND_LEV_RATE)
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return "Send Loss Event Rate";
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if (feat >= DCCPF_MIN_CCID_SPECIFIC)
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return "CCID-specific";
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