/*
 * if_alg: User-space algorithm interface
 *
 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#ifndef _CRYPTO_IF_ALG_H
#define _CRYPTO_IF_ALG_H

#include <linux/compiler.h>
#include <linux/completion.h>
#include <linux/if_alg.h>
#include <linux/scatterlist.h>
#include <linux/types.h>
#include <net/sock.h>

#define ALG_MAX_PAGES			16

struct crypto_async_request;

struct alg_sock {
	/* struct sock must be the first member of struct alg_sock */
	struct sock sk;

	struct sock *parent;

	unsigned int refcnt;
	unsigned int nokey_refcnt;

	const struct af_alg_type *type;
	void *private;
};

struct af_alg_completion {
	struct completion completion;
	int err;
};

struct af_alg_control {
	struct af_alg_iv *iv;
	int op;
	unsigned int aead_assoclen;
};

struct af_alg_type {
	void *(*bind)(const char *name, u32 type, u32 mask);
	void (*release)(void *private);
	int (*setkey)(void *private, const u8 *key, unsigned int keylen);
	int (*accept)(void *private, struct sock *sk);
	int (*accept_nokey)(void *private, struct sock *sk);
	int (*setauthsize)(void *private, unsigned int authsize);

	struct proto_ops *ops;
	struct proto_ops *ops_nokey;
	struct module *owner;
	char name[14];
};

struct af_alg_sgl {
	struct scatterlist sg[ALG_MAX_PAGES + 1];
	struct page *pages[ALG_MAX_PAGES];
	unsigned int npages;
};

int af_alg_register_type(const struct af_alg_type *type);
int af_alg_unregister_type(const struct af_alg_type *type);

int af_alg_release(struct socket *sock);
void af_alg_release_parent(struct sock *sk);
int af_alg_accept(struct sock *sk, struct socket *newsock);

int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len);
void af_alg_free_sg(struct af_alg_sgl *sgl);
void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new);

int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);

int af_alg_wait_for_completion(int err, struct af_alg_completion *completion);
void af_alg_complete(struct crypto_async_request *req, int err);

static inline struct alg_sock *alg_sk(struct sock *sk)
{
	return (struct alg_sock *)sk;
}

static inline void af_alg_init_completion(struct af_alg_completion *completion)
{
	init_completion(&completion->completion);
}

#endif	/* _CRYPTO_IF_ALG_H */
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=b1669c9f5ac9d50651889e22e4a82f1b34af32d3'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?h=nds-private-remove&amp;id=b1669c9f5ac9d50651889e22e4a82f1b34af32d3'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings?h=nds-private-remove&amp;id=b1669c9f5ac9d50651889e22e4a82f1b34af32d3'>dt-bindings</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/pinctrl?h=nds-private-remove&amp;id=b1669c9f5ac9d50651889e22e4a82f1b34af32d3'>pinctrl</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/pinctrl/sun4i-a10.h?h=nds-private-remove&amp;id=b1669c9f5ac9d50651889e22e4a82f1b34af32d3'>sun4i-a10.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/pinctrl/sun4i-a10.h?h=nds-private-remove&amp;id=b1669c9f5ac9d50651889e22e4a82f1b34af32d3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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<tr><th>author</th><td>Dimitris Michailidis &lt;dmichail@google.com&gt;</td><td class='right'>2017-01-30 14:09:42 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-31 13:16:59 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=90427ef5d2a4b9a24079889bf16afdcdaebc4240'>90427ef5d2a4b9a24079889bf16afdcdaebc4240</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=90427ef5d2a4b9a24079889bf16afdcdaebc4240'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=90427ef5d2a4b9a24079889bf16afdcdaebc4240'>05a3105bb966ada2f06b1c29dfcaa5e3bbf89223</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=c73e44269369e936165f0f9b61f1f09a11dae01c'>c73e44269369e936165f0f9b61f1f09a11dae01c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=90427ef5d2a4b9a24079889bf16afdcdaebc4240&amp;id2=c73e44269369e936165f0f9b61f1f09a11dae01c'>diff</a>)</td></tr></table>
<div class='commit-subject'>ipv6: fix flow labels when the traffic class is non-0</div><div class='commit-msg'>ip6_make_flowlabel() determines the flow label for IPv6 packets. It's
supposed to be passed a flow label, which it returns as is if non-0 and
in some other cases, otherwise it calculates a new value.

The problem is callers often pass a flowi6.flowlabel, which may also
contain traffic class bits. If the traffic class is non-0
ip6_make_flowlabel() mistakes the non-0 it gets as a flow label and
returns the whole thing. Thus it can return a 'flow label' longer than
20b and the low 20b of that is typically 0 resulting in packets with 0
label. Moreover, different packets of a flow may be labeled differently.
For a TCP flow with ECN non-payload and payload packets get different
labels as exemplified by this pair of consecutive packets:

(pure ACK)
Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    .... .... .... 0001 1100 1110 0100 1001 = Flow Label: 0x1ce49
    Payload Length: 32
    Next Header: TCP (6)

(payload)
Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0010 .... .... .... .... .... = Traffic Class: 0x02 (DSCP: CS0, ECN: ECT(0))
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..10 .... .... .... .... .... = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)
    .... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
    Payload Length: 688
    Next Header: TCP (6)

This patch allows ip6_make_flowlabel() to be passed more than just a
flow label and has it extract the part it really wants. This was simpler
than modifying the callers. With this patch packets like the above become

Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
    .... .... .... 1010 1111 1010 0101 1110 = Flow Label: 0xafa5e
    Payload Length: 32
    Next Header: TCP (6)

Internet Protocol Version 6, Src: 2002:af5:11a3::, Dst: 2002:af5:11a2::
    0110 .... = Version: 6
    .... 0000 0010 .... .... .... .... .... = Traffic Class: 0x02 (DSCP: CS0, ECN: ECT(0))
        .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
        .... .... ..10 .... .... .... .... .... = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)
    .... .... .... 1010 1111 1010 0101 1110 = Flow Label: 0xafa5e
    Payload Length: 688
    Next Header: TCP (6)

Signed-off-by: Dimitris Michailidis &lt;dmichail@google.com&gt;
Acked-by: Eric Dumazet &lt;edumazet@google.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=90427ef5d2a4b9a24079889bf16afdcdaebc4240'>Diffstat</a></div><table summary='diffstat' class='diffstat'><tr><td class='mode'>-rw-r--r--</td><td class='upd'><a href='/cgit.cgi/linux/net-next.git/diff/include/net/ipv6.h?h=nds-private-remove&amp;id=90427ef5d2a4b9a24079889bf16afdcdaebc4240'>include/net/ipv6.h</a></td><td class='right'>5</td><td class='graph'><table summary='file diffstat' width='5%'><tr><td class='add' style='width: 100.0%;'/><td class='rem' style='width: 0.0%;'/><td class='none' style='width: 0.0%;'/></tr></table></td></tr>
</table><div class='diffstat-summary'>1 files changed, 5 insertions, 0 deletions</div><table summary='diff' class='diff'><tr><td><div class='head'>diff --git a/include/net/ipv6.h b/include/net/ipv6.h