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ipv6: replace ipcm6_init calls with ipcm6_init_sk

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This initializes tclass and dontfrag before cmsg parsing, removing the
need for explicit checks against -1 in each caller.

Leave hlimit set to -1, because its full initialization
(in ip6_sk_dst_hoplimit) requires more state (dst, flowi6, ..).

This also prepares for calling sockcm_init in a follow-on patch.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250214222720.3205500-7-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Willem de Bruijn 2025-02-14 17:27:03 -05:00 committed by Jakub Kicinski
parent e848591105
commit 096208592b
4 changed files with 3 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/net/ipv6.h
View File

@ -363,15 +363,6 @@ struct ipcm6_cookie {
struct ipv6_txoptions *opt;
};
static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
{
*ipc6 = (struct ipcm6_cookie) {
.hlimit = -1,
.tclass = -1,
.dontfrag = -1,
};
}
static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
const struct sock *sk)
{

8
net/ipv6/raw.c
View File

@ -777,7 +777,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
fl6.flowi6_uid = sk->sk_uid;
ipcm6_init(&ipc6);
ipcm6_init_sk(&ipc6, sk);
ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags);
ipc6.sockc.mark = fl6.flowi6_mark;
ipc6.sockc.priority = READ_ONCE(sk->sk_priority);
@ -891,9 +891,6 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (hdrincl)
fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
if (ipc6.tclass < 0)
ipc6.tclass = np->tclass;
fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
@ -904,9 +901,6 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (ipc6.hlimit < 0)
ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
if (ipc6.dontfrag < 0)
ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk);
if (msg->msg_flags&MSG_CONFIRM)
goto do_confirm;

7
net/ipv6/udp.c
View File

@ -1494,7 +1494,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
int is_udplite = IS_UDPLITE(sk);
int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
ipcm6_init(&ipc6);
ipcm6_init_sk(&ipc6, sk);
ipc6.gso_size = READ_ONCE(up->gso_size);
ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags);
ipc6.sockc.mark = READ_ONCE(sk->sk_mark);
@ -1704,9 +1704,6 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
if (ipc6.tclass < 0)
ipc6.tclass = np->tclass;
fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel);
dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected);
@ -1752,8 +1749,6 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
WRITE_ONCE(up->pending, AF_INET6);
do_append_data:
if (ipc6.dontfrag < 0)
ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk);
up->len += ulen;
err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr),
&ipc6, fl6, dst_rt6_info(dst),

8
net/l2tp/l2tp_ip6.c
View File

@ -547,7 +547,7 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
fl6.flowi6_uid = sk->sk_uid;
ipcm6_init(&ipc6);
ipcm6_init_sk(&ipc6, sk);
if (lsa) {
if (addr_len < SIN6_LEN_RFC2133)
@ -634,9 +634,6 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
if (ipc6.tclass < 0)
ipc6.tclass = np->tclass;
fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
@ -648,9 +645,6 @@ static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (ipc6.hlimit < 0)
ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
if (ipc6.dontfrag < 0)
ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk);
if (msg->msg_flags & MSG_CONFIRM)
goto do_confirm;