kernel/linux.git/net/ipv4/ipip.c, branch v6.6.132

ipip,ip_tunnel,sit: Add FOU support for externally controlled ipip devices

2023-04-12T23:40:39+00:00

Today ipip devices in collect-metadata mode don't allow for sending FOU or GUE encapsulated packets. This patch lifts the restriction by adding a struct ip_tunnel_encap to the tunnel metadata. On the egress path, the members of this struct can be set by the bpf_skb_set_fou_encap kfunc via a BPF tc-hook. Instead of dropping packets wishing to use additional UDP encapsulation, ip_md_tunnel_xmit now evaluates the contents of this struct and adds the corresponding FOU or GUE header. Furthermore, it is making sure that additional header bytes are taken into account for PMTU discovery. On the ingress path, an ipip device in collect-metadata mode will fill this struct and a BPF tc-hook can obtain the information via a call to the bpf_skb_get_fou_encap kfunc. The minor change to ip_tunnel_encap, which now takes a pointer to struct ip_tunnel_encap instead of struct ip_tunnel, allows us to control FOU encap type and parameters on a per packet-level. Signed-off-by: Christian Ehrig Link: https://lore.kernel.org/r/cfea47de655d0f870248abf725932f851b53960a.1680874078.git.cehrig@cloudflare.com Signed-off-by: Alexei Starovoitov

ipv4: tunnels: use DEV_STATS_INC()

2022-11-16T12:48:44+00:00

Most of code paths in tunnels are lockless (eg NETIF_F_LLTX in tx). Adopt SMP safe DEV_STATS_INC() to update dev->stats fields. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

net: Add helper function to parse netlink msg of ip_tunnel_parm

2022-10-03T06:59:06+00:00

Add ip_tunnel_netlink_parms to parse netlink msg of ip_tunnel_parm. Reduces duplicate code, no actual functional changes. Signed-off-by: Liu Jian Signed-off-by: David S. Miller

net: Add helper function to parse netlink msg of ip_tunnel_encap

2022-10-03T06:59:06+00:00

Add ip_tunnel_netlink_encap_parms to parse netlink msg of ip_tunnel_encap. Reduces duplicate code, no actual functional changes. Signed-off-by: Liu Jian Signed-off-by: David S. Miller

ip: use dev_addr_set() in tunnels

2021-10-13T16:41:37+00:00

Use dev_addr_set() instead of writing to netdev->dev_addr directly in ip tunnels drivers. Signed-off-by: Jakub Kicinski

ip_tunnel: use ndo_siocdevprivate

2021-07-27T19:11:44+00:00

The various ipv4 and ipv6 tunnel drivers each implement a set of 12 SIOCDEVPRIVATE commands for managing tunnels. These all work correctly in compat mode. Move them over to the new .ndo_siocdevprivate operation. Cc: Hideaki YOSHIFUJI Cc: David Ahern Cc: Steffen Klassert Cc: Herbert Xu Signed-off-by: Arnd Bergmann Signed-off-by: David S. Miller

ipip: allow redirecting ipip and mplsip packets to eth devices

2021-06-28T19:44:17+00:00

Even though ipip transports IPv4 or MPLS packets, it needs to reset the mac_header pointer, so that other parts of the stack don't mistakenly access the outer header after the packet has been decapsulated. This allows to push an Ethernet header to ipip or mplsip packets and redirect them to an Ethernet device: $ tc filter add dev ipip0 ingress matchall \ action vlan push_eth dst_mac 00:00:5e:00:53:01 \ src_mac 00:00:5e:00:53:00 \ action mirred egress redirect dev eth0 Without this patch, push_eth refuses to add an ethernet header because the skb appears to already have a MAC header. Signed-off-by: Guillaume Nault Signed-off-by: David S. Miller

ipv4/ipv6: switch to dev_get_tstats64

2020-11-10T01:50:28+00:00

Replace ip_tunnel_get_stats64() with the new identical core function dev_get_tstats64(). Signed-off-by: Heiner Kallweit Signed-off-by: Jakub Kicinski

net: ipip: implement header_ops->parse_protocol for AF_PACKET

2020-06-30T19:29:39+00:00

Ipip uses skb->protocol to determine packet type, and bails out if it's not set. For AF_PACKET injection, we need to support its call chain of: packet_sendmsg -> packet_snd -> packet_parse_headers -> dev_parse_header_protocol -> parse_protocol Without a valid parse_protocol, this returns zero, and ipip rejects the skb. So, this wires up the ip_tunnel handler for layer 3 packets for that case. Signed-off-by: Jason A. Donenfeld Acked-by: Willem de Bruijn Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2020-05-24T20:47:27+00:00

The MSCC bug fix in 'net' had to be slightly adjusted because the register accesses are done slightly differently in net-next. Signed-off-by: David S. Miller