kernel/linux.git/include/net/ipv6_stubs.h, branch v6.1.174

bpf: Derive source IP addr via bpf_*_fib_lookup()

2024-03-06T14:45:20+00:00

commit dab4e1f06cabb6834de14264394ccab197007302 upstream. Extend the bpf_fib_lookup() helper by making it to return the source IPv4/IPv6 address if the BPF_FIB_LOOKUP_SRC flag is set. For example, the following snippet can be used to derive the desired source IP address: struct bpf_fib_lookup p = { .ipv4_dst = ip4->daddr }; ret = bpf_skb_fib_lookup(skb, p, sizeof(p), BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH); if (ret != BPF_FIB_LKUP_RET_SUCCESS) return TC_ACT_SHOT; /* the p.ipv4_src now contains the source address */ The inability to derive the proper source address may cause malfunctions in BPF-based dataplanes for hosts containing netdevs with more than one routable IP address or for multi-homed hosts. For example, Cilium implements packet masquerading in BPF. If an egressing netdev to which the Cilium's BPF prog is attached has multiple IP addresses, then only one [hardcoded] IP address can be used for masquerading. This breaks connectivity if any other IP address should have been selected instead, for example, when a public and private addresses are attached to the same egress interface. The change was tested with Cilium [1]. Nikolay Aleksandrov helped to figure out the IPv6 addr selection. [1]: https://github.com/cilium/cilium/pull/28283 Signed-off-by: Martynas Pumputis Link: https://lore.kernel.org/r/20231007081415.33502-2-m@lambda.lt Signed-off-by: Martin KaFai Lau Signed-off-by: Daniel Borkmann Signed-off-by: Greg Kroah-Hartman

bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt()

2022-09-03T03:34:32+00:00

This patch changes bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt(). It removes the duplicated code from bpf_getsockopt(SOL_IPV6). This also makes bpf_getsockopt(SOL_IPV6) supporting the same set of optnames as in bpf_setsockopt(SOL_IPV6). In particular, this adds IPV6_AUTOFLOWLABEL support to bpf_getsockopt(SOL_IPV6). ipv6 could be compiled as a module. Like how other code solved it with stubs in ipv6_stubs.h, this patch adds the do_ipv6_getsockopt to the ipv6_bpf_stub. Signed-off-by: Martin KaFai Lau Link: https://lore.kernel.org/r/20220902002931.2896218-1-kafai@fb.com Signed-off-by: Alexei Starovoitov

bpf: Change bpf_setsockopt(SOL_IPV6) to reuse do_ipv6_setsockopt()

2022-08-19T00:06:13+00:00

After the prep work in the previous patches, this patch removes the dup code from bpf_setsockopt(SOL_IPV6) and reuses the implementation in do_ipv6_setsockopt(). ipv6 could be compiled as a module. Like how other code solved it with stubs in ipv6_stubs.h, this patch adds the do_ipv6_setsockopt to the ipv6_bpf_stub. The current bpf_setsockopt(IPV6_TCLASS) does not take the INET_ECN_MASK into the account for tcp. The do_ipv6_setsockopt(IPV6_TCLASS) will handle it correctly. The existing optname white-list is refactored into a new function sol_ipv6_setsockopt(). After this last SOL_IPV6 dup code removal, the __bpf_setsockopt() is simplified enough that the extra "{ }" around the if statement can be removed. Reviewed-by: Stanislav Fomichev Signed-off-by: Martin KaFai Lau Link: https://lore.kernel.org/r/20220817061834.4181198-1-kafai@fb.com Signed-off-by: Alexei Starovoitov

net: ipv6: add fib6_nh_release_dsts stub

2021-11-22T15:44:49+00:00

We need a way to release a fib6_nh's per-cpu dsts when replacing nexthops otherwise we can end up with stale per-cpu dsts which hold net device references, so add a new IPv6 stub called fib6_nh_release_dsts. It must be used after an RCU grace period, so no new dsts can be created through a group's nexthop entry. Similar to fib6_nh_release it shouldn't be used if fib6_nh_init has failed so it doesn't need a dummy stub when IPv6 is not enabled. Fixes: 7bf4796dd099 ("nexthops: add support for replace") Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller

ipv6: add ipv6_dev_find to stubs

2021-03-30T20:29:39+00:00

Add ipv6_dev_find to ipv6_stub to allow lookup of net_devices by IPV6 address in net/ipv4/icmp.c. Signed-off-by: Andreas Roeseler Signed-off-by: David S. Miller

ipv6: add ipv6_fragment hook in ipv6_stub

2020-08-31T19:26:39+00:00

Add ipv6_fragment to ipv6_stub to avoid calling netfilter when access ip6_fragment. Signed-off-by: wenxu Signed-off-by: David S. Miller

Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next

2020-05-29T20:02:33+00:00

Steffen Klassert says: ==================== pull request (net-next): ipsec-next 2020-05-29 1) Add IPv6 encapsulation support for ESP over UDP and TCP. From Sabrina Dubroca. 2) Remove unneeded reference when initializing xfrm interfaces. From Nicolas Dichtel. 3) Remove some indirect calls from the state_afinfo. From Florian Westphal. Please note that this pull request has two merge conflicts between commit: 0c922a4850eb ("xfrm: Always set XFRM_TRANSFORMED in xfrm{4,6}_output_finish") from Linus' tree and commit: 2ab6096db2f1 ("xfrm: remove output_finish indirection from xfrm_state_afinfo") from the ipsec-next tree. and between commit: 3986912f6a9a ("ipv6: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl") from the net-next tree and commit: 0146dca70b87 ("xfrm: add support for UDPv6 encapsulation of ESP") from the ipsec-next tree. Both conflicts can be resolved as done in linux-next. ==================== Signed-off-by: David S. Miller

net: Refactor arguments of inet{,6}_bind

2020-05-08T22:48:20+00:00

The intent is to add an additional bind parameter in the next commit. Instead of adding another argument, let's convert all existing flag arguments into an extendable bit field. No functional changes. Signed-off-by: Stanislav Fomichev Signed-off-by: Daniel Borkmann Acked-by: Andrey Ignatov Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20200508174611.228805-4-sdf@google.com

xfrm: expose local_rxpmtu via ipv6_stubs

2020-05-06T07:40:08+00:00

We cannot call this function from the core kernel unless we would force CONFIG_IPV6=y. Therefore expose this via ipv6_stubs so we can call it from net/xfrm in the followup patch. Since the call is expected to be unlikely, no extra code for the IPV6=y case is added and we will always eat the indirection cost. Signed-off-by: Florian Westphal Signed-off-by: Steffen Klassert

net: ipv6: new arg skip_notify to ip6_rt_del

2020-04-28T19:50:37+00:00

Used in subsequent work to skip route delete notifications on nexthop deletes. Suggested-by: David Ahern Signed-off-by: Roopa Prabhu Reviewed-by: David Ahern Signed-off-by: David S. Miller