Commit 6b01b1d9 authored by Taehee Yoo's avatar Taehee Yoo Committed by Jakub Kicinski
Browse files

gtp: do not allow adding duplicate tid and ms_addr pdp context 



GTP RX packet path lookups pdp context with TID. If duplicate TID pdp
contexts are existing in the list, it couldn't select correct pdp context.
So, TID value  should be unique.
GTP TX packet path lookups pdp context with ms_addr. If duplicate ms_addr pdp
contexts are existing in the list, it couldn't select correct pdp context.
So, ms_addr value should be unique.

Fixes: 459aa660 ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: default avatarTaehee Yoo <ap420073@gmail.com>
Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
parent 5d485ed8

drivers/net/gtp.c

+22 −10
Original line number Diff line number Diff line
@@ -926,24 +926,31 @@ static void ipv4_pdp_fill(struct pdp_ctx *pctx, struct genl_info *info) 
	}

}



static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk,

static int gtp_pdp_add(struct gtp_dev *gtp, struct sock *sk,

		       struct genl_info *info)

{

	struct pdp_ctx *pctx, *pctx_tid = NULL;

	struct net_device *dev = gtp->dev;

	u32 hash_ms, hash_tid = 0;

	struct pdp_ctx *pctx;

	unsigned int version;

	bool found = false;

	__be32 ms_addr;



	ms_addr = nla_get_be32(info->attrs[GTPA_MS_ADDRESS]);

	hash_ms = ipv4_hashfn(ms_addr) % gtp->hash_size;

	version = nla_get_u32(info->attrs[GTPA_VERSION]);



	hlist_for_each_entry_rcu(pctx, &gtp->addr_hash[hash_ms], hlist_addr) {

		if (pctx->ms_addr_ip4.s_addr == ms_addr) {

	pctx = ipv4_pdp_find(gtp, ms_addr);

	if (pctx)

		found = true;

	if (version == GTP_V0)

		pctx_tid = gtp0_pdp_find(gtp,

					 nla_get_u64(info->attrs[GTPA_TID]));

	else if (version == GTP_V1)

		pctx_tid = gtp1_pdp_find(gtp,

					 nla_get_u32(info->attrs[GTPA_I_TEI]));

	if (pctx_tid)

		found = true;

			break;

		}

	}



	if (found) {

		if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
@@ -951,6 +958,11 @@ static int ipv4_pdp_add(struct gtp_dev *gtp, struct sock *sk, 
		if (info->nlhdr->nlmsg_flags & NLM_F_REPLACE)

			return -EOPNOTSUPP;



		if (pctx && pctx_tid)

			return -EEXIST;

		if (!pctx)

			pctx = pctx_tid;



		ipv4_pdp_fill(pctx, info);



		if (pctx->gtp_version == GTP_V0)
@@ -1074,7 +1086,7 @@ static int gtp_genl_new_pdp(struct sk_buff *skb, struct genl_info *info) 
		goto out_unlock;

	}



	err = ipv4_pdp_add(gtp, sk, info);

	err = gtp_pdp_add(gtp, sk, info);



out_unlock:

	rcu_read_unlock();

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