5682d393b4
In a latter patch, there is a need to update "cb->min_dump_alloc" in inet_sk_diag_fill() as it learns the diffierent bpf_sk_storages stored in a sk while dumping all sk(s) (e.g. tcp_hashinfo). The inet_sk_diag_fill() currently does not take the "cb" as an argument. One of the reason is inet_sk_diag_fill() is used by both dump_one() and dump() (which belong to the "struct inet_diag_handler". The dump_one() interface does not pass the "cb" along. This patch is to make dump_one() pass a "cb". The "cb" is created in inet_diag_cmd_exact(). The "nlh" and "in_skb" are stored in "cb" as the dump() interface does. The total number of args in inet_sk_diag_fill() is also cut from 10 to 7 and that helps many callers to pass fewer args. In particular, "struct user_namespace *user_ns", "u32 pid", and "u32 seq" can be replaced by accessing "cb->nlh" and "cb->skb". A similar argument reduction is also made to inet_twsk_diag_fill() and inet_req_diag_fill(). inet_csk_diag_dump() and inet_csk_diag_fill() are also removed. They are mostly equivalent to inet_sk_diag_fill(). Their repeated usages are very limited. Thus, inet_sk_diag_fill() is directly used in those occasions. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20200225230409.1975173-1-kafai@fb.com
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* net/dccp/diag.c
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*
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* An implementation of the DCCP protocol
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* Arnaldo Carvalho de Melo <acme@mandriva.com>
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*/
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#include <linux/module.h>
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#include <linux/inet_diag.h>
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#include "ccid.h"
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#include "dccp.h"
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static void dccp_get_info(struct sock *sk, struct tcp_info *info)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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const struct inet_connection_sock *icsk = inet_csk(sk);
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memset(info, 0, sizeof(*info));
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info->tcpi_state = sk->sk_state;
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info->tcpi_retransmits = icsk->icsk_retransmits;
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info->tcpi_probes = icsk->icsk_probes_out;
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info->tcpi_backoff = icsk->icsk_backoff;
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info->tcpi_pmtu = icsk->icsk_pmtu_cookie;
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if (dp->dccps_hc_rx_ackvec != NULL)
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info->tcpi_options |= TCPI_OPT_SACK;
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if (dp->dccps_hc_rx_ccid != NULL)
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ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
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if (dp->dccps_hc_tx_ccid != NULL)
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ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
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}
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static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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void *_info)
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{
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r->idiag_rqueue = r->idiag_wqueue = 0;
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if (_info != NULL)
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dccp_get_info(sk, _info);
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}
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static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
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const struct inet_diag_req_v2 *r, struct nlattr *bc)
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{
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inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r, bc);
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}
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static int dccp_diag_dump_one(struct netlink_callback *cb,
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const struct inet_diag_req_v2 *req)
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{
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return inet_diag_dump_one_icsk(&dccp_hashinfo, cb, req);
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}
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static const struct inet_diag_handler dccp_diag_handler = {
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.dump = dccp_diag_dump,
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.dump_one = dccp_diag_dump_one,
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.idiag_get_info = dccp_diag_get_info,
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.idiag_type = IPPROTO_DCCP,
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.idiag_info_size = sizeof(struct tcp_info),
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};
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static int __init dccp_diag_init(void)
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{
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return inet_diag_register(&dccp_diag_handler);
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}
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static void __exit dccp_diag_fini(void)
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{
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inet_diag_unregister(&dccp_diag_handler);
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}
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module_init(dccp_diag_init);
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module_exit(dccp_diag_fini);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
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MODULE_DESCRIPTION("DCCP inet_diag handler");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-33 /* AF_INET - IPPROTO_DCCP */);
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