netdev - [PATCH bpf-next v2 4/8] net: ipv6: Factor ipv6_frag

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Message-Id: <2928ca6d91690f04f59759bb330e01fcf3f061a7.1677526810.git.dxu@dxuuu.xyz>
Date:   Mon, 27 Feb 2023 12:51:06 -0700
From:   Daniel Xu <dxu@...uu.xyz>
To:     kuba@...nel.org, edumazet@...gle.com, davem@...emloft.net,
        dsahern@...nel.org, pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH bpf-next v2 4/8] net: ipv6: Factor ipv6_frag_rcv() to take netns and user

Factor _ipv6_frag_rcv() out of ipv6_frag_rcv() such that the former
takes a netns and user field.

We do this so that the BPF interface for ipv6 defrag can have the same
semantics as ipv4 defrag (see ip_check_defrag()).

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 include/net/ipv6.h    |  1 +
 net/ipv6/reassembly.c | 16 +++++++++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 7332296eca44..9bbdf82ca6c0 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1238,6 +1238,7 @@ int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 extern const struct proto_ops inet6_stream_ops;
 extern const struct proto_ops inet6_dgram_ops;
 extern const struct proto_ops inet6_sockraw_ops;
+int _ipv6_frag_rcv(struct net *net, struct sk_buff *skb, u32 user);
 
 struct group_source_req;
 struct group_filter;
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 5bc8a28e67f9..5100430eb982 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -81,13 +81,13 @@ static void ip6_frag_expire(struct timer_list *t)
 }
 
 static struct frag_queue *
-fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif)
+fq_find(struct net *net, __be32 id, const struct ipv6hdr *hdr, int iif, u32 user)
 {
 	struct frag_v6_compare_key key = {
 		.id = id,
 		.saddr = hdr->saddr,
 		.daddr = hdr->daddr,
-		.user = IP6_DEFRAG_LOCAL_DELIVER,
+		.user = user,
 		.iif = iif,
 	};
 	struct inet_frag_queue *q;
@@ -324,12 +324,11 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *skb,
 	return -1;
 }
 
-static int ipv6_frag_rcv(struct sk_buff *skb)
+int _ipv6_frag_rcv(struct net *net, struct sk_buff *skb, u32 user)
 {
 	struct frag_hdr *fhdr;
 	struct frag_queue *fq;
 	const struct ipv6hdr *hdr = ipv6_hdr(skb);
-	struct net *net = dev_net(skb_dst(skb)->dev);
 	u8 nexthdr;
 	int iif;
 
@@ -377,7 +376,7 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
 	}
 
 	iif = skb->dev ? skb->dev->ifindex : 0;
-	fq = fq_find(net, fhdr->identification, hdr, iif);
+	fq = fq_find(net, fhdr->identification, hdr, iif, user);
 	if (fq) {
 		u32 prob_offset = 0;
 		int ret;
@@ -410,6 +409,13 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
 	return -1;
 }
 
+static int ipv6_frag_rcv(struct sk_buff *skb)
+{
+	struct net *net = dev_net(skb_dst(skb)->dev);
+
+	return _ipv6_frag_rcv(net, skb, IP6_DEFRAG_LOCAL_DELIVER);
+}
+
 static const struct inet6_protocol frag_protocol = {
 	.handler	=	ipv6_frag_rcv,
 	.flags		=	INET6_PROTO_NOPOLICY,
-- 
2.39.1