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l2tp: add peer_offset parameter
Introduce peer_offset parameter in order to add the capability to specify two different values for payload offset on tx/rx side. If just offset is provided by userspace use it for rx side as well in order to maintain compatibility with older l2tp versions Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -127,6 +127,7 @@ enum {
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L2TP_ATTR_UDP_ZERO_CSUM6_TX, /* flag */
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L2TP_ATTR_UDP_ZERO_CSUM6_RX, /* flag */
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L2TP_ATTR_PAD,
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L2TP_ATTR_PEER_OFFSET, /* u16 */
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__L2TP_ATTR_MAX,
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};
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@ -792,7 +792,7 @@ void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
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ptr += 2 + offset;
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}
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} else
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ptr += session->offset;
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ptr += session->peer_offset;
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offset = ptr - optr;
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if (!pskb_may_pull(skb, offset))
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@ -1785,6 +1785,7 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn
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session->lns_mode = cfg->lns_mode;
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session->reorder_timeout = cfg->reorder_timeout;
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session->offset = cfg->offset;
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session->peer_offset = cfg->peer_offset;
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session->l2specific_type = cfg->l2specific_type;
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session->l2specific_len = cfg->l2specific_len;
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session->cookie_len = cfg->cookie_len;
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@ -59,7 +59,8 @@ struct l2tp_session_cfg {
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int debug; /* bitmask of debug message
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* categories */
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u16 vlan_id; /* VLAN pseudowire only */
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u16 offset; /* offset to payload */
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u16 offset; /* offset to tx payload */
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u16 peer_offset; /* offset to rx payload */
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u16 l2specific_len; /* Layer 2 specific length */
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u16 l2specific_type; /* Layer 2 specific type */
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u8 cookie[8]; /* optional cookie */
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@ -86,8 +87,14 @@ struct l2tp_session {
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int cookie_len;
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u8 peer_cookie[8];
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int peer_cookie_len;
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u16 offset; /* offset from end of L2TP header
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to beginning of data */
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u16 offset; /* offset from end of L2TP
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* header to beginning of
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* tx data
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*/
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u16 peer_offset; /* offset from end of L2TP
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* header to beginning of
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* rx data
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*/
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u16 l2specific_len;
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u16 l2specific_type;
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u16 hdr_len;
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@ -180,8 +180,9 @@ static void l2tp_dfs_seq_session_show(struct seq_file *m, void *v)
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session->lns_mode ? "LNS" : "LAC",
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session->debug,
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jiffies_to_msecs(session->reorder_timeout));
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seq_printf(m, " offset %hu l2specific %hu/%hu\n",
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session->offset, session->l2specific_type, session->l2specific_len);
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seq_printf(m, " offset %hu peer_offset %hu l2specific %hu/%hu\n",
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session->offset, session->peer_offset,
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session->l2specific_type, session->l2specific_len);
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if (session->cookie_len) {
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seq_printf(m, " cookie %02x%02x%02x%02x",
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session->cookie[0], session->cookie[1],
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@ -228,7 +229,8 @@ static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
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seq_puts(m, " debug tx-pkts/bytes/errs rx-pkts/bytes/errs\n");
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seq_puts(m, " SESSION ID, peer ID, PWTYPE\n");
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seq_puts(m, " refcnt cnt\n");
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seq_puts(m, " offset OFFSET l2specific TYPE/LEN\n");
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seq_puts(m, " offset OFFSET peer_offset OFFSET");
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seq_puts(m, " l2specific TYPE/LEN\n");
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seq_puts(m, " [ cookie ]\n");
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seq_puts(m, " [ peer cookie ]\n");
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seq_puts(m, " config mtu/mru/rcvseq/sendseq/dataseq/lns debug reorderto\n");
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@ -547,9 +547,25 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
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}
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if (tunnel->version > 2) {
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if (info->attrs[L2TP_ATTR_OFFSET])
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if (info->attrs[L2TP_ATTR_PEER_OFFSET]) {
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struct nlattr *peer_offset;
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peer_offset = info->attrs[L2TP_ATTR_PEER_OFFSET];
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cfg.peer_offset = nla_get_u16(peer_offset);
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}
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if (info->attrs[L2TP_ATTR_OFFSET]) {
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cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
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/* in order to maintain compatibility with older
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* versions where offset was used for both tx and
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* rx side, update rx side with offset if peer_offset
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* is not provided by userspace
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*/
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if (!info->attrs[L2TP_ATTR_PEER_OFFSET])
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cfg.peer_offset = cfg.offset;
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}
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if (info->attrs[L2TP_ATTR_DATA_SEQ])
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cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);
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@ -763,6 +779,8 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int fl
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nla_put_string(skb, L2TP_ATTR_IFNAME, session->ifname)) ||
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(session->offset &&
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nla_put_u16(skb, L2TP_ATTR_OFFSET, session->offset)) ||
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(session->peer_offset &&
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nla_put_u16(skb, L2TP_ATTR_PEER_OFFSET, session->peer_offset)) ||
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(session->cookie_len &&
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nla_put(skb, L2TP_ATTR_COOKIE, session->cookie_len,
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&session->cookie[0])) ||
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@ -903,6 +921,7 @@ static const struct nla_policy l2tp_nl_policy[L2TP_ATTR_MAX + 1] = {
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[L2TP_ATTR_PW_TYPE] = { .type = NLA_U16, },
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[L2TP_ATTR_ENCAP_TYPE] = { .type = NLA_U16, },
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[L2TP_ATTR_OFFSET] = { .type = NLA_U16, },
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[L2TP_ATTR_PEER_OFFSET] = { .type = NLA_U16, },
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[L2TP_ATTR_DATA_SEQ] = { .type = NLA_U8, },
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[L2TP_ATTR_L2SPEC_TYPE] = { .type = NLA_U8, },
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[L2TP_ATTR_L2SPEC_LEN] = { .type = NLA_U8, },
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