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l2tp: remove build_header callback in struct l2tp_session 

The structure of an L2TP data packet header varies depending on the
version of the L2TP protocol being used.

struct l2tp_session used to have a build_header callback to abstract
this difference away.  It's clearer to simply choose the correct
function to use when building the data packet (and we save on the
function pointer in the session structure).

This approach does mean dereferencing the parent tunnel structure in
order to determine the tunnel version, but we're doing that in the
transmit path in any case.

Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Parkin 2020-07-28 18:20:31 +01:00 committed by David S. Miller
parent 628703f59d
commit 2dedab6ff5
2 changed files with 4 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
net/l2tp/l2tp_core.c
View File

@ -1116,7 +1116,10 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
}
/* Setup L2TP header */
session->build_header(session, __skb_push(skb, hdr_len));
if (tunnel->version == L2TP_HDR_VER_2)
l2tp_build_l2tpv2_header(session, __skb_push(skb, hdr_len));
else
l2tp_build_l2tpv3_header(session, __skb_push(skb, hdr_len));
/* Reset skb netfilter state */
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
@ -1700,11 +1703,6 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn
memcpy(&session->peer_cookie[0], &cfg->peer_cookie[0], cfg->peer_cookie_len);
}
if (tunnel->version == L2TP_HDR_VER_2)
session->build_header = l2tp_build_l2tpv2_header;
else
session->build_header = l2tp_build_l2tpv3_header;
l2tp_session_set_header_len(session, tunnel->version);
refcount_set(&session->ref_count, 1);

1
net/l2tp/l2tp_core.h
View File

@ -101,7 +101,6 @@ struct l2tp_session {
struct l2tp_stats stats;
struct hlist_node global_hlist; /* global hash list node */
int (*build_header)(struct l2tp_session *session, void *buf);
void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
void (*session_close)(struct l2tp_session *session);
void (*show)(struct seq_file *m, void *priv);