diff options
| author |   Alexander Duyck <alexanderduyck@fb.com> | 2022-05-13 11:34:03 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2022-05-16 10:18:56 +0100 |
| commit | 0fe79f28bfaf73b66b7b1562d2468f94aa03bd12 (patch) | |
| tree | 0656d24d4e0cc9d8ae6e04106737b392b706271c /net/core | |
| parent | ipv6/gro: insert temporary HBH/jumbo header (diff) | |
| download | linux-dev-0fe79f28bfaf73b66b7b1562d2468f94aa03bd12.tar.xz linux-dev-0fe79f28bfaf73b66b7b1562d2468f94aa03bd12.zip | |
net: allow gro_max_size to exceed 65536
Allow the gro_max_size to exceed a value larger than 65536.
There weren't really any external limitations that prevented this other
than the fact that IPv4 only supports a 16 bit length field. Since we have
the option of adding a hop-by-hop header for IPv6 we can allow IPv6 to
exceed this value and for IPv4 and non-TCP flows we can cap things at 65536
via a constant rather than relying on gro_max_size.
[edumazet] limit GRO_MAX_SIZE to (8 * 65535) to avoid overflows.
Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/dev.c | 2 | ||||
| -rw-r--r-- | net/core/gro.c | 8 | ||||
| -rw-r--r-- | net/core/rtnetlink.c | 8 |
3 files changed, 9 insertions, 9 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 830beb05161a..d93456c75b55 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -10598,7 +10598,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, dev->gso_max_size = GSO_LEGACY_MAX_SIZE; dev->gso_max_segs = GSO_MAX_SEGS; - dev->gro_max_size = GRO_MAX_SIZE; + dev->gro_max_size = GRO_LEGACY_MAX_SIZE; dev->tso_max_size = TSO_LEGACY_MAX_SIZE; dev->tso_max_segs = TSO_MAX_SEGS; dev->upper_level = 1; diff --git a/net/core/gro.c b/net/core/gro.c index 78110edf5d4b..b4190eb08467 100644 --- a/net/core/gro.c +++ b/net/core/gro.c @@ -167,6 +167,14 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) if (unlikely(p->len + len >= gro_max_size || NAPI_GRO_CB(skb)->flush)) return -E2BIG; + if (unlikely(p->len + len >= GRO_LEGACY_MAX_SIZE)) { + if (p->protocol != htons(ETH_P_IPV6) || + skb_headroom(p) < sizeof(struct hop_jumbo_hdr) || + ipv6_hdr(p)->nexthdr != IPPROTO_TCP || + p->encapsulation) + return -E2BIG; + } + lp = NAPI_GRO_CB(p)->last; pinfo = skb_shinfo(lp); diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index f2b0f747d3d2..ac45328607f7 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2360,14 +2360,6 @@ static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[], } } - if (tb[IFLA_GRO_MAX_SIZE]) { - u32 gro_max_size = nla_get_u32(tb[IFLA_GRO_MAX_SIZE]); - - if (gro_max_size > GRO_MAX_SIZE) { - NL_SET_ERR_MSG(extack, "too big gro_max_size"); - return -EINVAL; - } - } return 0; } |